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From: Tianran Zhou <zhoutianran@huawei.com>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, Christian Hopps <chopps@chopps.org>
CC: wangyali <wangyali11@huawei.com>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
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Date: Wed, 1 Apr 2020 08:00:16 +0000
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References: <1520992FC97B944A9979C2FC1D7DB0F404DB1AD4@dggeml524-mbx.china.huawei.com> <MW3PR11MB4619361A2CA3A402A44914E5C1FE0@MW3PR11MB4619.namprd11.prod.outlook.com> <1520992FC97B944A9979C2FC1D7DB0F404DB2336@dggeml524-mbx.china.huawei.com> <68249E56-5702-4C15-9748-439E43F3EB0E@chopps.org> <1520992FC97B944A9979C2FC1D7DB0F404DEFC14@dggeml524-mbx.china.huawei.com> <A937FECB-2013-403E-89B2-47971514F6CF@chopps.org> <80a8f83c76d447dda48280495b3a80a7@huawei.com> <6F0E8437-5D82-4FAC-A061-69E56E1E161D@chopps.org> <2189e17f36764960bf2dcc554cde9ce0@huawei.com> <MW3PR11MB4619925BEF83B0C4512DD284C1C90@MW3PR11MB4619.namprd11.prod.outlook.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/AOYW-dhQfYbvqfk8BQ4QwF8HhMA>
Subject: Re: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
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Hi Les,

Thanks very much for your suggestion. I have a quick look at rfc6823. Sound=
s like a good idea. I will think about it.

Cheers,
Tianran

-----Original Message-----
From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]=20
Sent: Wednesday, April 1, 2020 1:47 PM
To: Tianran Zhou <zhoutianran@huawei.com>; Christian Hopps <chopps@chopps.o=
rg>
Cc: wangyali <wangyali11@huawei.com>; lsr@ietf.org
Subject: RE: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capab=
ility-02

Tianran -

I am very much in agreement with the points Chris has made.

IGPs do not exist to advertise capabilities/configure applications - which =
seems to me to be what you are proposing here.
The fact that you can easily define the encodings does not make it the righ=
t thing to do.

This issue was discussed at length in the context of https://tools.ietf.org=
/html/rfc6823 . If you were proposing to use GENAPP I would not object - th=
ough I do think Chris has correctly pointed out that NETCONF/YANG is likely=
 a more appropriate solution for your use case.

   Les


> -----Original Message-----
> From: Tianran Zhou <zhoutianran@huawei.com>
> Sent: Tuesday, March 31, 2020 7:53 PM
> To: Christian Hopps <chopps@chopps.org>
> Cc: wangyali <wangyali11@huawei.com>; Les Ginsberg (ginsberg)=20
> <ginsberg@cisco.com>; lsr@ietf.org
> Subject: RE: [Lsr] A new version of I-D,=20
> draft-liu-lsr-isis-ifit-node-capability-02
>=20
> Hi Chris,
> Thanks for your quick reply, and please see inline.
>=20
> Cheers,
> Tianran
>=20
> -----Original Message-----
> From: Christian Hopps [mailto:chopps@chopps.org]
> Sent: Wednesday, April 1, 2020 10:00 AM
> To: Tianran Zhou <zhoutianran@huawei.com>
> Cc: Christian Hopps <chopps@chopps.org>; wangyali=20
> <wangyali11@huawei.com>; Les Ginsberg (ginsberg) <ginsberg@cisco.com>;=20
> lsr@ietf.org
> Subject: Re: [Lsr] A new version of I-D,=20
> draft-liu-lsr-isis-ifit-node-capability-02
>=20
>=20
>=20
> > On Mar 31, 2020, at 9:28 PM, Tianran Zhou <zhoutianran@huawei.com>
> wrote:
> >
> > ZTR> Let's not boil the ocean to compare NETCONF/YANG or routing
> protocol, which is better. But I did not see the modification to=20
> routing protocol with some TLVs is a heavy work, or more complex than=20
> NETCONF/YANG.  I see both are available and useful.
>=20
> I'm not sure what you mean by boiling the ocean. I'm saying that YANG=20
> is built and intended for querying capabilities and configuring=20
> routers. Why isn't that where you are looking first for configuring your =
monitoring application?
>=20
> ZTR> I know NETCONF can do both query and configuration. And I know
> resent YANG-Push improvements to reduce the polling.  But routing=20
> protocol solutions are also widely used for this. There are already=20
> many RFCs and implementation practices. We considered both ways, and=20
> aimed for different scenarios.
>=20
> You don't see the major difference between writing a YANG model vs=20
> modifying all of the standard IETF routing protocols?
>=20
> ZTR> I know many differences between NETCONF and routing protocol.
> There are many details on both interfaces, implementations, scenarios=20
> when comparing them. That's what I mean boil the ocean.
> Here I do not know what's the "major difference" you mean?
>=20
> Thanks,
> Chris.


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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Tianran Zhou <zhoutianran@huawei.com>, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, Christian Hopps <chopps@chopps.org>
CC: "lsr@ietf.org" <lsr@ietf.org>, wangyali <wangyali11@huawei.com>
Thread-Topic: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Tianran Zhou <zhoutianran@huawei.com>, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, Christian Hopps <chopps@chopps.org>
CC: "lsr@ietf.org" <lsr@ietf.org>, wangyali <wangyali11@huawei.com>
Thread-Topic: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
Thread-Index: AQHWB0vODjKl3NCVqkmbXtiVDWHTIqhjeyUAgAAIpACAAA8IAIAAMHSAgAAlSwCAAAJFgIAABaQA
Date: Wed, 1 Apr 2020 12:28:35 +0000
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From nobody Wed Apr  1 05:35:07 2020
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Subject: [Lsr] I-D Action: draft-ietf-lsr-flex-algo-07.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Link State Routing WG of the IETF.

        Title           : IGP Flexible Algorithm
        Authors         : Peter Psenak
                          Shraddha Hegde
                          Clarence Filsfils
                          Ketan Talaulikar
                          Arkadiy Gulko
	Filename        : draft-ietf-lsr-flex-algo-07.txt
	Pages           : 34
	Date            : 2020-04-01

Abstract:
   IGP protocols traditionally compute best paths over the network based
   on the IGP metric assigned to the links.  Many network deployments
   use RSVP-TE based or Segment Routing based Traffic Engineering to
   enforce traffic over a path that is computed using different metrics
   or constraints than the shortest IGP path.  This document proposes a
   solution that allows IGPs themselves to compute constraint based
   paths over the network.  This document also specifies a way of using
   Segment Routing (SR) Prefix-SIDs and SRv6 locators to steer packets
   along the constraint-based paths.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-lsr-flex-algo/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-lsr-flex-algo-07
https://datatracker.ietf.org/doc/html/draft-ietf-lsr-flex-algo-07

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-lsr-flex-algo-07


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/



From nobody Wed Apr  1 13:02:03 2020
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In-Reply-To: <84b355a9-d3ce-af0e-ae60-f765aab4ec63@cisco.com>
From: Chris Bowers <chrisbowers.ietf@gmail.com>
Date: Wed, 1 Apr 2020 14:58:40 -0500
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To: Peter Psenak <ppsenak@cisco.com>
Cc: "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>, SPRING WG List <spring@ietf.org>,  Bruno Decraene <bruno.decraene@orange.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/IvJM97ZTOQvm9C6gjvyoJspNX9Y>
Subject: Re: [Lsr] clarification of locator block and locator node in draft-ietf-spring-srv6-network-programming and draft-ietf-lsr-isis-srv6-extensions
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Peter,



There seem to be two disconnects in this discussion.



1) The response below implies that the encodings in
draft-ietf-lsr-isis-srv6-extensions are supposed represent the case where
the locators are allocated from several different IPv6 address blocks (for
example, blocks S1/s1 through Sn/sn). However,
draft-ietf-spring-srv6-network-programming and
draft-ietf-6man-segment-routing-header only discuss the case where the
locators are allocated from a single block (S/s).  If an implementation is
expected to properly encode the case where locators are allocated from
several different IPv6 address blocks, then I think that case should be
explicitly described in these documents.



2)   The response below says "To be able to find out where the func and arg
are located, you need to know the LOC length, e.g. Block and Node length."
However, the SRv6 SID Structure Sub-Sub-TLV is carried within the SRv6 End
SID, SRv6 End.X SID, and the SRv6 LAN End.X SID Sub-TLVs, which are carried
within the SRv6 Locator TLV.  The  SRv6 Locator TLV has a Loc-Size field.
Why would the value of the LOC length computed as the sum of the Block and
Node length ever be different from the value in the Loc-Size field?



Chris

On Wed, Mar 25, 2020 at 9:49 AM Peter Psenak <ppsenak@cisco.com> wrote:

> Chris,
>
> please see inline:
>
>
> On 23/03/2020 17:39, Chris Bowers wrote:
> > Peter,
> >
> > The proposed SRv6 SID Structure Sub-Sub-TLV has several problems.
> >
> > 1) As discussed in item#3 below, it is not clear that flooding LB
> > Length, LN Length, Fun. Length, and Arg. Length to all ISIS speakers is
> > really the right approach.  However, if the WG determines that it is th=
e
> > right approach, the current encodings of this information in the
> > proposed SRv6 SID Structure Sub-Sub-TLV are problematic.  As discussed
> > earlier in this thread, a network operator may choose to not allocate
> > all locators from a single block, so LB Length and LN Length may not be
> > well-defined.
>
> I'm not sure what do you mean by not "well defined". For every SID you
> need to know the LOC (B+N) part. If you guarantee that it is the same on
> all nodes, you know it from the local config, otherwise, you advertise
> it with a SID.
>
> > The current encoding of the SRv6 SID Structure
> > Sub-Sub-TLV makes it difficult to represent this situation.  The simple
> > thing to do for nodes that don't have a well-defined value of LB Length
> > and LN Length would be to not advertise a value for LB Length and LN
> > Length.  However, since the currently proposed SRv6 SID Structure
> > Sub-Sub-TLV combines LB Length, LN Length, Fun. Length, and Arg. Length
> > into a single sub-sub-TLV, if a node wants to advertise values for Fun.
> > Length and Arg. Length, it also has to advertise values for LB Length
> > and LN Length.  It seems like a better approach would be to have
> > different sub-sub-TLVs, one for  LB Length and LN Length, and a separat=
e
> > one for Fun. Length and Arg. Length to be able to better represent this
> > situation.
>
>
> I'm afraid you are missing an important point.
>
> SRv6 SID is defined as LOC:FUNCT:ARG, where LOC is represented as B:N.
> To be able to find out where the func and arg are located, you need to
> know the LOC length, e.g. Block and Node length. Advertising just Func
> and Arg length does not help.
>
>
> >
> > 2) Now consider the situation where a network operator chooses to
> > allocate all locators from a single block, so that LB Length and LN
> > Length are well-defined across the network.  A given node should
> > presumably advertise its own understanding of LB Length and LN Length.
> > A given node's understanding of LB Length and LN Length is a property o=
f
> > the node.  It is not a property of a given End SID.  The currently
> > proposed SRv6 SID Structure Sub-Sub-TLV however is carried within each
> > End SID Sub-TLV.  With the currently proposed encoding, presumably an
> > implementation is expected to send the exact same values of LB Length
> > and LN Length for all of the End SIDs that it advertises.  Not only is
> > this inefficient, but it creates the need for logic to decide what to d=
o
> > when different End SIDs advertised by the same node carry different
> > values of LB Length and LN Length in their sub-sub-TLVs.  It seems like
> > a better approach would be for a given node to advertise its
> > understanding of the value of LB Length and LN Length in a sub-TLV of
> > the Router Capability TLV.
>
> When we design the encoding, we have to define it such, that it supports
> all possible use cases. We can not design the encoding that works for
> single use case (allocate all locators from a single block) and does not
> work for others - different block from different node, multiple blocks
> on a single node (e.g. border node), which are all valid.
>
> >
> > 3) At this point, the only use case that has been proposed for flooding
> > the LB Length, LN Length, Fun. Length, and Arg. Length to all ISIS
> > speakers is to make it more convenient for BGP-LS to get those values t=
o
> > an external controller as part of a topology feed from any ISIS node.
> > No use case has been proposed for ISIS speakers themselves to make use
> > of the information.  It seems like a more scalable approach would be to
> > use BGP-LS sessions to collect the information from the subset of nodes
> > that actually produce the relevant information.  So far there are no En=
d
> > SIDs defined that are advertised in ISIS that have a non-zero Arg.
> > Length.  If an End SID with non-zero Arg. Length were to be proposed in
> > the future as needing to be flooded to all ISIS nodes, it seems likely
> > that the new End SID would also be advertised using the BGP IP/VPN/EVPN
> > control plane.   So it seems like a viable alternative for this
> > hypothetical future End SID would be to have the subset of nodes that
> > have non-zero Arg. Length values communicate to an external controller
> > via  BGP sessions. I think the WG needs a more detailed discussion of a
> > concrete use case in order to determine whether flooding LB Length, LN
> > Length, Fun. Length, and Arg. Length to all ISIS speakers is really the
> > right approach.
>
> there are networks, where BGP is not deployed on all nodes, only on a
> few nodes that re-distribute the information to BGP-LS. In such case we
> need the IGP to distribute this data.
>
> Argument that "it seems likely that the new End SID would also be
> advertised using the BGP IP/VPN/EVPN" is a wishful thinking that we can
> not based our encoding on.
>
>
> >
> > Given the lack of a compelling use case for flooding LB Length, LN
> > Length, Fun. Length, and Arg. Length to all ISIS speakers and the
> > problems with the currently proposed encodings for doing that, I think
> > that the SRv6 SID Structure Sub-Sub-TLV should be removed from
> > draft-ietf-lsr-isis-srv6-extensions. A mechanism for flooding LB Length=
,
> > LN Length, Fun. Length, and Arg. Length to all ISIS speakers can be
> > defined in a future document.
>
> The security use case has already been pointed out earlier in this thread=
:
>
>
> https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#sec=
tion-5
>
> Given the arguments I mentioned above, I respectfully disagree with the
> removal of the SID Structure Sub-Sub-TLV from the ISIS SRv6 draft.
>
> thanks,
> Peter
>
>
> >
> > Thanks,
> > Chris
> >
> > On Fri, Mar 13, 2020 at 5:02 AM Peter Psenak <ppsenak@cisco.com
> > <mailto:ppsenak@cisco.com>> wrote:
> >
> >     Hi Chris,
> >
> >     On 12/03/2020 15:58, Chris Bowers wrote:
> >      > Peter,
> >      >
> >      > I think that the SRv6 SID Structure Sub-Sub-TLV should be remove=
d
> >     from
> >      > draft-ietf-lsr-isis-srv6-extensions.  I think that we should
> >     leave the
> >      > ability to include sub-sub-TLVs in the SRv6 End SID Sub-TLV,
> >     End.X SID
> >      > Sub-TLV, and LAN End.X SID Sub-TLV in the encodings for those
> >     sub-TLVs.
> >      >
> >      > I don't think that the current text describing the SRv6 SID
> >     Structure
> >      > Sub-Sub-TLV would result in interoperable implementations.  Base=
d
> >     on the
> >
> >     SRv6 base spec defines SID B, L, A, F.
> >
> >     SRv6 protocol specs are advertising these values with the SRv6 SID,
> >     they
> >     don't use them. The usage is outside of the scope of the protocol
> >     drafts. What exactly is the problem?
> >
> >     thanks,
> >     Peter
> >
> >
> >      > discussion with Ketan below, it appears that use cases for ISIS
> >     speakers
> >      > receiving advertised values of LB Length, LN Length, Fun. Length=
,
> >     and
> >      > Arg. Length are not currently well-defined.    So I think it
> >     makes sense
> >      > to defer the definition of the SRv6 SID Structure Sub-Sub-TLV to=
 a
> >      > future document.
> >      >
> >      > Thanks,
> >      > Chris
> >      >
> >      > On Thu, Mar 12, 2020 at 6:02 AM Ketan Talaulikar (ketant)
> >      > <ketant@cisco.com <mailto:ketant@cisco.com>
> >     <mailto:ketant@cisco.com <mailto:ketant@cisco.com>>> wrote:
> >      >
> >      >     Hi Chris,____
> >      >
> >      >     __ __
> >      >
> >      >     Dropping the draft-ietf-spring-srv6-network-programming
> authors
> >      >     since we are now back to discussing the ISIS extensions.____
> >      >
> >      >     __ __
> >      >
> >      >     Please check inline below.____
> >      >
> >      >     __ __
> >      >
> >      >     *From:*Chris Bowers <chrisbowers.ietf@gmail.com
> >     <mailto:chrisbowers.ietf@gmail.com>
> >      >     <mailto:chrisbowers.ietf@gmail.com
> >     <mailto:chrisbowers.ietf@gmail.com>>>
> >      >     *Sent:* 05 March 2020 21:53
> >      >     *To:* Ketan Talaulikar (ketant) <ketant@cisco.com
> >     <mailto:ketant@cisco.com>
> >      >     <mailto:ketant@cisco.com <mailto:ketant@cisco.com>>>
> >      >     *Cc:* Ketan Talaulikar (ketant) <ketant@cisco.com
> >     <mailto:ketant@cisco.com>
> >      >     <mailto:ketant@cisco.com <mailto:ketant@cisco.com>>>;
> >     lsr@ietf.org <mailto:lsr@ietf.org> <mailto:lsr@ietf.org
> >     <mailto:lsr@ietf.org>>;
> >      >     SPRING WG List <spring@ietf.org <mailto:spring@ietf.org>
> >     <mailto:spring@ietf.org <mailto:spring@ietf.org>>>;
> >      >     draft-ietf-spring-srv6-network-programming
> >      >     <draft-ietf-spring-srv6-network-programming@ietf.org
> >     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org>
> >      >     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org
> >     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org>>>;
> Peter
> >      >     Psenak (ppsenak) <ppsenak@cisco.com
> >     <mailto:ppsenak@cisco.com> <mailto:ppsenak@cisco.com
> >     <mailto:ppsenak@cisco.com>>>;
> >      >     Bruno Decraene <bruno.decraene@orange.com
> >     <mailto:bruno.decraene@orange.com>
> >      >     <mailto:bruno.decraene@orange.com
> >     <mailto:bruno.decraene@orange.com>>>
> >      >     *Subject:* Re: [Lsr] clarification of locator block and
> >     locator node
> >      >     in draft-ietf-spring-srv6-network-programming and
> >      >     draft-ietf-lsr-isis-srv6-extensions____
> >      >
> >      >     __ __
> >      >
> >      >     Ketan,____
> >      >
> >      >     __ __
> >      >
> >      >     See inline [CB].____
> >      >
> >      >     __ __
> >      >
> >      >     On Wed, Mar 4, 2020 at 12:36 AM Ketan Talaulikar (ketant)
> >      >     <ketant@cisco.com <mailto:ketant@cisco.com>
> >     <mailto:ketant@cisco.com <mailto:ketant@cisco.com>>> wrote:____
> >      >
> >      >         Hi Chris,____
> >      >
> >      >         ____
> >      >
> >      >         You are right in that there is no assumption that all SR=
v6
> >      >         locators in a domain are allocated from the same block.
> >      >         Therefore knowing the blocks used in the domain is
> >     useful.____
> >      >
> >      >     ____
> >      >
> >      >     [CB] Since you refer to "blocks" (plural) in this sentence,
> >     are you
> >      >     saying that in the scenario where all SRv6 locators in a
> >     domain are
> >      >     not allocated from the same block, you would expect differen=
t
> >      >     routers in the same domain to advertise different values of =
B
> >     and N?
> >      >     ____
> >      >
> >      >     */[KT] While personally I believe it would not be the usual
> >     case, it
> >      >     is left to the operator.____/*
> >      >
> >      >     */__ __/*
> >      >
> >      >     For example, assume we have a network where all SRv6 locator=
s
> >     in a
> >      >     domain are not allocated from the same block.  Router A
> >     advertises
> >      >     an SRv6 Locator TLV with locator =3D 2000::/64, and an SRv6 =
End
> SID
> >      >     sub-TLV with some endpoint behavior. Router B advertises an
> SRv6
> >      >     Locator TLV with locator =3D 3000::/64, and an SRv6 End SID
> sub-TLV
> >      >     with some endpoint behavior. What should routers A and B
> >     advertise
> >      >     as the values of B and N in their SRv6 SID Structure
> >     Sub-Sub-TLVs ?____
> >      >
> >      >     */[KT] It is difficult for me to figure out what the block
> >     and node
> >      >     parts are with such an addressing./*____
> >      >
> >      >     ____
> >      >
> >      >         ____
> >      >
> >      >         The IGP drafts covers the advertisement of the B and N
> >     parts of
> >      >         the locally configured locator on the node via IGPs. On
> the
> >      >         receiver side, the IGP may not really do much with this
> >      >         information, however it enables propagation of this
> >     information
> >      >         from all nodes in the network to be advertised out via
> BGP-LS
> >      >         (or other mechanisms) as part of the topology feed. Once
> >     this is
> >      >         part of the topology feed, it enables use-cases on
> >     controllers
> >      >         to perform network wide validation of the SRv6 SID block
> >      >         provisioning and can also help in automation of the
> security
> >      >         aspects described in
> >      >
> >
> https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#sec=
tion-5____
> >      >
> >      >         ____
> >      >
> >      >     [CB] If an ISIS speaker is not expected to do anything with =
B
> >     and N,
> >      >     then I think the text in draft-ietf-lsr-isis-srv6-extensions
> >     needs
> >      >     to clarify this.  I have a similar observation about Fun.
> >     Length and
> >      >     Arg. Length in the SRv6 SID Structure Sub-Sub-TLV .  As far
> >     as I can
> >      >     tell, none of the endpoint behaviors that are currently
> >     specified to
> >      >     be carried in ISIS End, End.X, and LAN End.X SIDs sub-TLVs
> >     uses an
> >      >     Argument, so there is never a case where an SRv6 SID Structu=
re
> >      >     Sub-Sub-TLV should have a non-zero value for Arg. Length. Wh=
at
> >      >     should an ISIS speaker do if it receives a non-zero value of
> the
> >      >     Arg. Length for an endpoint behavior that doesn't use an
> >     argument?
> >      >     Are there any use cases envisioned where an ISIS speaker
> needs to
> >      >     know the Arg. Length ? ____
> >      >
> >      >     */[KT] The behaviors currently listed in the draft do not
> have an
> >      >     argument nor is the use of B and N required for them. We
> cannot
> >      >     preclude a future use-case or extension where such behaviors
> >      >     introduced are also applicable to ISIS. So IMHO ruling such
> >     aspects
> >      >     out might not be the right thing to do from a protocol
> >     extensibility
> >      >     perspective.____/*
> >      >
> >      >     */__ __/*
> >      >
> >      >     */Thanks,____/*
> >      >
> >      >     */Ketan/*____
> >      >
> >      >     __ __
> >      >
> >      >         Thanks,____
> >      >
> >      >         Ketan____
> >      >
> >      >         ____
> >      >
> >      >         *From:*Chris Bowers <chrisbowers.ietf@gmail.com
> >     <mailto:chrisbowers.ietf@gmail.com>
> >      >         <mailto:chrisbowers.ietf@gmail.com
> >     <mailto:chrisbowers.ietf@gmail.com>>>
> >      >         *Sent:* 02 March 2020 23:39
> >      >         *To:* Ketan Talaulikar (ketant) <ketant@cisco.com
> >     <mailto:ketant@cisco.com>
> >      >         <mailto:ketant@cisco.com <mailto:ketant@cisco.com>>>
> >      >         *Cc:* Ketan Talaulikar (ketant)
> >      >         <ketant=3D40cisco.com@dmarc.ietf.org
> >     <mailto:40cisco.com@dmarc.ietf.org>
> >      >         <mailto:40cisco..com@dmarc.ietf.org
> >     <mailto:40cisco..com@dmarc.ietf.org>>>; lsr@ietf.org
> >     <mailto:lsr@ietf.org>
> >      >         <mailto:lsr@ietf.org <mailto:lsr@ietf.org>>; SPRING WG
> >     List <spring@ietf.org <mailto:spring@ietf.org>
> >      >         <mailto:spring@ietf.org <mailto:spring@ietf.org>>>;
> >      >         draft-ietf-spring-srv6-network-programming
> >      >         <draft-ietf-spring-srv6-network-programming@ietf.org
> >     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org>
> >      >
> >       <mailto:draft-ietf-spring-srv6-network-programming@ietf.org
> >     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org>>>;
> >      >         Peter Psenak (ppsenak) <ppsenak@cisco.com
> >     <mailto:ppsenak@cisco.com>
> >      >         <mailto:ppsenak@cisco.com <mailto:ppsenak@cisco.com>>>;
> >     Bruno Decraene
> >      >         <bruno.decraene@orange.com
> >     <mailto:bruno.decraene@orange.com> <mailto:bruno.decraene@orange.co=
m
> >     <mailto:bruno.decraene@orange.com>>>
> >      >         *Subject:* Re: [Lsr] clarification of locator block and
> >     locator
> >      >         node in draft-ietf-spring-srv6-network-programming and
> >      >         draft-ietf-lsr-isis-srv6-extensions____
> >      >
> >      >         ____
> >      >
> >      >         Ketan,____
> >      >
> >      >         ____
> >      >
> >      >         Based on current documents, allocating all SRv6 locators
> >     used in
> >      >         a domain from a single block is optional.____
> >      >
> >      >         ____
> >      >
> >      >         However, assuming for the moment that a network operator
> has
> >      >         chosen to allocate all SRv6 locators used in a domain
> from a
> >      >         single block, so that there is a well-defined value of B
> >     and N
> >      >         across a domain, what is the use of having a router
> advertise
> >      >         its own understanding of these two values?  And what is =
a
> >      >         receiver supposed to do with this information?____
> >      >
> >      >         ____
> >      >
> >      >         Thanks,____
> >      >
> >      >         Chris____
> >      >
> >      >         ____
> >      >
> >      >         On Fri, Feb 28, 2020 at 8:23 AM
> >     <bruno.decraene@orange.com <mailto:bruno.decraene@orange.com>
> >      >         <mailto:bruno.decraene@orange.com
> >     <mailto:bruno.decraene@orange.com>>> wrote:____
> >      >
> >      >             Hi Ketan,____
> >      >
> >      >             ____
> >      >
> >      >             Thanks fort the follow up.____
> >      >
> >      >             Clarification inline [Bruno]____
> >      >
> >      >             ____
> >      >
> >      >             *From**:*Ketan Talaulikar (ketant)
> >     [mailto:ketant@cisco.com <mailto:ketant@cisco.com>
> >      >             <mailto:ketant@cisco.com <mailto:ketant@cisco.com>>]
> >      >             *Sent:* Friday, February 28, 2020 11:11 AM
> >      >             *To:* DECRAENE Bruno TGI/OLN; Ketan Talaulikar
> (ketant);
> >      >             Chris Bowers
> >      >             *Cc:* lsr@ietf.org <mailto:lsr@ietf.org>
> >     <mailto:lsr@ietf.org <mailto:lsr@ietf.org>>; SPRING WG List;
> >      >             draft-ietf-spring-srv6-network-programming; Peter
> Psenak
> >      >             (ppsenak)
> >      >             *Subject:* RE: [Lsr] clarification of locator block
> and
> >      >             locator node in
> >     draft-ietf-spring-srv6-network-programming
> >      >             and draft-ietf-lsr-isis-srv6-extensions____
> >      >
> >      >             ____
> >      >
> >      >             Hi Bruno,____
> >      >
> >      >             ____
> >      >
> >      >             I believe the description and usage of Locator is
> >     very well
> >      >             described and covered in the net-pgm draft as also t=
he
> >      >             corresponding IGP extensions. Is the question is mor=
e
> >     about
> >      >             the =E2=80=9Cblock=E2=80=9D part of it (what is not =
in the block part
> >     is in
> >      >             the node part as per the text in the net-pgm
> draft)?____
> >      >
> >      >             ____
> >      >
> >      >             The =E2=80=9Cblock=E2=80=9D is again not a new thing=
. Please check the
> >      >             following:____
> >      >
> >      >             Under
> >      >
> >
> https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#sec=
tion-5
> >      >             =E2=80=A6 look for =E2=80=9Cblock=E2=80=9D____
> >      >
> >      > https://tools.ietf.org/html/rfc8402#section-2 =E2=80=A6 look und=
er
> >      >             SRGB for SRv6____
> >      >
> >      >             ____
> >      >
> >      >             [Bruno]____
> >      >
> >      >             To clarify, my question was not specific to =E2=80=
=9Cblock=E2=80=9D
> but
> >      >             related to the usage, by the receiver, of the
> following
> >      >             piece of information:____
> >      >
> >      >             ____
> >      >
> >      >                    LB Length: SRv6 SID Locator Block length____
> >      >
> >      >                    LN Length: SRv6 SID Locator Node length____
> >      >
> >      >                    Fun. Length: SRv6 SID Function length____
> >      >
> >      >                    Arg. Length: SRv6 SID Arguments length____
> >      >
> >      >             ____
> >      >
> >      >             ____
> >      >
> >      >             So perhaps I don=E2=80=99t get Chris=E2=80=99s point=
 and would wait
> >     for him
> >      >             to clarify.____
> >      >
> >      >             [Bruno] I=E2=80=99ll leave this to Chris.____
> >      >
> >      >             ____
> >      >
> >      >             Thanks,____
> >      >
> >      >             Ketan____
> >      >
> >      >             ____
> >      >
> >      >             *From:*Lsr <lsr-bounces@ietf.org
> >     <mailto:lsr-bounces@ietf.org>
> >      >             <mailto:lsr-bounces@ietf.org
> >     <mailto:lsr-bounces@ietf.org>>> *On Behalf Of
> >      >             *bruno.decraene@orange.com
> >     <mailto:bruno.decraene@orange.com> <mailto:bruno.decraene@orange.co=
m
> >     <mailto:bruno.decraene@orange.com>>
> >      >             *Sent:* 28 February 2020 14:34
> >      >             *To:* Ketan Talaulikar (ketant)
> >      >             <ketant=3D40cisco.com@dmarc.ietf.org
> >     <mailto:40cisco.com@dmarc.ietf.org>
> >      >             <mailto:40cisco..com@dmarc.ietf.org
> >     <mailto:40cisco..com@dmarc.ietf.org>>>; Chris Bowers
> >      >             <chrisbowers.ietf@gmail.com
> >     <mailto:chrisbowers.ietf@gmail.com>
> >     <mailto:chrisbowers.ietf@gmail.com <mailto:
> chrisbowers.ietf@gmail.com>>>
> >      >             *Cc:* lsr@ietf.org <mailto:lsr@ietf.org>
> >     <mailto:lsr@ietf.org <mailto:lsr@ietf.org>>; SPRING WG List
> >      >             <spring@ietf.org <mailto:spring@ietf.org>
> >     <mailto:spring@ietf.org <mailto:spring@ietf.org>>>;
> >      >             draft-ietf-spring-srv6-network-programming
> >      >             <draft-ietf-spring-srv6-network-programming@ietf.org
> >     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org>
> >      >
> >       <mailto:draft-ietf-spring-srv6-network-programming@ietf.org
> >     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org>>>;
> >      >             Peter Psenak (ppsenak) <ppsenak@cisco.com
> >     <mailto:ppsenak@cisco.com>
> >      >             <mailto:ppsenak@cisco.com <mailto:ppsenak@cisco.com
> >>>
> >      >             *Subject:* Re: [Lsr] clarification of locator block
> and
> >      >             locator node in
> >     draft-ietf-spring-srv6-network-programming
> >      >             and draft-ietf-lsr-isis-srv6-extensions____
> >      >
> >      >             ____
> >      >
> >      >             Hi Ketan,____
> >      >
> >      >             ____
> >      >
> >      >             ____
> >      >
> >      >             ____
> >      >
> >      >             *From:*Lsr [mailto:lsr-bounces@ietf.org
> >     <mailto:lsr-bounces@ietf.org>] *On Behalf Of
> >      >             *Ketan Talaulikar (ketant)
> >      >             *Sent:* Friday, February 28, 2020 6:30 AM____
> >      >
> >      >             ____
> >      >
> >      >             Hi Chris,____
> >      >
> >      >             ____
> >      >
> >      >             I agree with Peter and I would suggest to drop LSR
> since
> >      >             this is not a protocol specific thing.____
> >      >
> >      >             ____
> >      >
> >      >             I believe the text in
> >      >             draft-ietf-spring-srv6-network-programming clears
> >     says what
> >      >             locator block and locator node are. What more detail=
s
> >     do you
> >      >             think are required?____
> >      >
> >      >             ____
> >      >
> >      >             [Bruno] Speaking as an individual, the draft could
> >     possibly
> >      >             clarify the usage of these information/fields by the
> >      >             receiver. Possibly using the same name/term (e.g.
> >     SRv6 SID
> >      >             Locator Block length) to ease the references between
> both
> >      >             drafts.____
> >      >
> >      >             ____
> >      >
> >      >             Thanks,____
> >      >
> >      >             --Bruno____
> >      >
> >      >             ____
> >      >
> >      >             Thanks,____
> >      >
> >      >             Ketan____
> >      >
> >      >             ____
> >      >
> >      >             *From:*Lsr <lsr-bounces@ietf.org
> >     <mailto:lsr-bounces@ietf.org>
> >      >             <mailto:lsr-bounces@ietf.org
> >     <mailto:lsr-bounces@ietf.org>>> *On Behalf Of *Chris Bowers
> >      >             *Sent:* 27 February 2020 22:46
> >      >             *To:* lsr@ietf.org <mailto:lsr@ietf.org>
> >     <mailto:lsr@ietf.org <mailto:lsr@ietf.org>>; SPRING WG List
> >      >             <spring@ietf.org <mailto:spring@ietf.org>
> >     <mailto:spring@ietf.org <mailto:spring@ietf.org>>>
> >      >             *Cc:* Peter Psenak (ppsenak) <ppsenak@cisco.com
> >     <mailto:ppsenak@cisco.com>
> >      >             <mailto:ppsenak@cisco.com <mailto:ppsenak@cisco.com
> >>>
> >      >             *Subject:* [Lsr] clarification of locator block and
> >     locator
> >      >             node in draft-ietf-spring-srv6-network-programming a=
nd
> >      >             draft-ietf-lsr-isis-srv6-extensions____
> >      >
> >      >             ____
> >      >
> >      >             SPRING and LSR WGs,____
> >      >
> >      >             ____
> >      >
> >      >             I think that we need a much more detailed descriptio=
n
> >     of the
> >      >             locator block and locator node in either
> >      >             draft-ietf-spring-srv6-network-programming or
> >      >             draft-ietf-lsr-isis-srv6-extensions.  See original
> email
> >      >             below.____
> >      >
> >      >             ____
> >      >
> >      >             Thanks,____
> >      >
> >      >             Chris____
> >      >
> >      >             ____
> >      >
> >      >             On Thu, Feb 27, 2020 at 11:08 AM Peter Psenak
> >      >             <ppsenak@cisco.com <mailto:ppsenak@cisco.com>
> >     <mailto:ppsenak@cisco.com <mailto:ppsenak@cisco.com>>> wrote:____
> >      >
> >      >                 Hi Chris,
> >      >
> >      >                 On 27/02/2020 17:54, Chris Bowers wrote:
> >      >                  > LSR WG,
> >      >                  >
> >      >                  > Section 9 of
> >     draft-ietf-lsr-isis-srv6-extensions-05
> >      >                 defines the  SRv6
> >      >                  > SID Structure Sub-Sub-TLV. In particular, it
> >     defines
> >      >                 encoding for the
> >      >                  > locator block length and the locator node
> length.
> >      >                 The text refers to
> >      >                  > [I-D.ietf-spring-srv6-network-programming] fo=
r
> the
> >      >                 definition of these
> >      >                  > concepts.
> >      >                  >
> >      >                  > As far as I can tell, the only reference to
> >     locator
> >      >                 block and locator
> >      >                  > node in
> >     draft-ietf-spring-srv6-network-programming-10
> >      >                 is section 3.1
> >      >                  > which has the following text:
> >      >                  >
> >      >                  >     A locator may be represented as B:N where
> B is
> >      >                 the SRv6 SID block
> >      >                  >     (IPv6 subnet allocated for SRv6 SIDs by t=
he
> >      >                 operator) and N is the
> >      >                  >     identifier of the parent node
> >     instantiating the
> >      >                 SID...
> >      >                  >
> >      >                  > I think that we need a much more detailed
> >     description
> >      >                 of the locator
> >      >                  > block and locator node.
> >      >
> >      >                 sure, but that would be in the
> >      >                 draft-ietf-spring-srv6-network-programming-10,
> not in
> >      >                 draft-ietf-lsr-isis-srv6-extensions, as these ar=
e
> >     not a
> >      >                 protocol
> >      >                 specific constructs.
> >      >
> >      >                 thanks,
> >      >                 Peter
> >      >
> >      >                  >
> >      >                  > Thanks,
> >      >                  >
> >      >                  > Chris
> >      >                  > ____
> >      >
> >      >
> >
>  ________________________________________________________________________=
_____________________________________________________
> >      >
> >      >             ____
> >      >
> >      >             Ce message et ses pieces jointes peuvent contenir de=
s
> >      >             informations confidentielles ou privilegiees et ne
> >     doivent donc____
> >      >
> >      >             pas etre diffuses, exploites ou copies sans
> >     autorisation. Si
> >      >             vous avez recu ce message par erreur, veuillez le
> >     signaler____
> >      >
> >      >             a l'expediteur et le detruire ainsi que les pieces
> >     jointes.
> >      >             Les messages electroniques etant susceptibles
> >     d'alteration,____
> >      >
> >      >             Orange decline toute responsabilite si ce message a
> ete
> >      >             altere, deforme ou falsifie. Merci.____
> >      >
> >      >             ____
> >      >
> >      >             This message and its attachments may contain
> >     confidential or
> >      >             privileged information that may be protected by
> law;____
> >      >
> >      >             they should not be distributed, used or copied witho=
ut
> >      >             authorisation.____
> >      >
> >      >             If you have received this email in error, please
> >     notify the
> >      >             sender and delete this message and its
> attachments.____
> >      >
> >      >             As emails may be altered, Orange is not liable for
> >     messages
> >      >             that have been modified, changed or falsified.____
> >      >
> >      >             Thank you.____
> >      >
> >      >
> >
>  ________________________________________________________________________=
_____________________________________________________
> >      >
> >      >             ____
> >      >
> >      >             Ce message et ses pieces jointes peuvent contenir de=
s
> >      >             informations confidentielles ou privilegiees et ne
> >     doivent donc____
> >      >
> >      >             pas etre diffuses, exploites ou copies sans
> >     autorisation. Si
> >      >             vous avez recu ce message par erreur, veuillez le
> >     signaler____
> >      >
> >      >             a l'expediteur et le detruire ainsi que les pieces
> >     jointes.
> >      >             Les messages electroniques etant susceptibles
> >     d'alteration,____
> >      >
> >      >             Orange decline toute responsabilite si ce message a
> ete
> >      >             altere, deforme ou falsifie. Merci.____
> >      >
> >      >             ____
> >      >
> >      >             This message and its attachments may contain
> >     confidential or
> >      >             privileged information that may be protected by
> law;____
> >      >
> >      >             they should not be distributed, used or copied witho=
ut
> >      >             authorisation.____
> >      >
> >      >             If you have received this email in error, please
> >     notify the
> >      >             sender and delete this message and its
> attachments.____
> >      >
> >      >             As emails may be altered, Orange is not liable for
> >     messages
> >      >             that have been modified, changed or falsified.____
> >      >
> >      >             Thank you.____
> >      >
> >
>
>

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<div dir=3D"ltr"><div dir=3D"ltr">



















<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span>Peter,<span></span></span></p=
>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span><span>=C2=A0</span></span></p=
>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span>There
seem to be two disconnects in this discussion.<span></span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span><span>=C2=A0</span></span></p=
>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span>1)
The response below implies that the encodings in
draft-ietf-lsr-isis-srv6-extensions are supposed represent the case where t=
he
locators are allocated from several different IPv6 address blocks (for exam=
ple,
blocks S1/s1 through Sn/sn). However,
draft-ietf-spring-srv6-network-programming and
draft-ietf-6man-segment-routing-header only discuss the case where the loca=
tors
are allocated from a single block (S/s).=C2=A0 If an implementation is expe=
cted
to properly encode the case where locators are allocated from several diffe=
rent
IPv6 address blocks, then I think that case should be explicitly described =
in
these documents. =C2=A0<span></span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span><span>=C2=A0</span></span></p=
>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span>2)=C2=A0=C2=A0
The response below says &quot;To be able to find out where the func and arg=
 are
located, you need to know the LOC length, e.g. Block and Node
length.&quot;=C2=A0 However, the SRv6 SID Structure Sub-Sub-TLV is carried
within the SRv6 End SID, SRv6 End.X SID, and the SRv6 LAN End.X SID Sub-TLV=
s,
which are carried within the SRv6 Locator TLV.=C2=A0 The=C2=A0 SRv6 Locator=
 TLV
has a Loc-Size field.=C2=A0 Why would the value of the LOC length computed =
as
the sum of the Block and Node length ever be different from the value in th=
e
Loc-Size field?<span></span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span><span>=C2=A0</span></span></p=
>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"><span>Chris<span></span></span></p>





</div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">=
On Wed, Mar 25, 2020 at 9:49 AM Peter Psenak &lt;<a href=3D"mailto:ppsenak@=
cisco.com">ppsenak@cisco.com</a>&gt; wrote:<br></div><blockquote class=3D"g=
mail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204=
,204,204);padding-left:1ex">Chris,<br>
<br>
please see inline:<br>
<br>
<br>
On 23/03/2020 17:39, Chris Bowers wrote:<br>
&gt; Peter,<br>
&gt; <br>
&gt; The proposed SRv6 SID Structure Sub-Sub-TLV has several problems.<br>
&gt; <br>
&gt; 1) As discussed in item#3 below, it is not clear that flooding LB <br>
&gt; Length, LN Length, Fun. Length, and Arg. Length to all ISIS speakers i=
s <br>
&gt; really the right approach.=C2=A0 However, if the WG determines that it=
 is the <br>
&gt; right approach, the current encodings of this information in the <br>
&gt; proposed SRv6 SID Structure Sub-Sub-TLV are problematic.=C2=A0 As disc=
ussed <br>
&gt; earlier in this thread, a network operator may choose to not allocate =
<br>
&gt; all locators from a single block, so LB Length and LN Length may not b=
e <br>
&gt; well-defined.=C2=A0 <br>
<br>
I&#39;m not sure what do you mean by not &quot;well defined&quot;. For ever=
y SID you <br>
need to know the LOC (B+N) part. If you guarantee that it is the same on <b=
r>
all nodes, you know it from the local config, otherwise, you advertise <br>
it with a SID.<br>
<br>
&gt; The current encoding of the SRv6 SID Structure <br>
&gt; Sub-Sub-TLV makes it difficult to represent this situation.=C2=A0 The =
simple <br>
&gt; thing to do for nodes that don&#39;t have a well-defined value of LB L=
ength <br>
&gt; and LN Length would be to not advertise a value for LB Length and LN <=
br>
&gt; Length.=C2=A0 However, since the currently proposed SRv6 SID Structure=
 <br>
&gt; Sub-Sub-TLV combines LB Length, LN Length, Fun. Length, and Arg. Lengt=
h <br>
&gt; into a single sub-sub-TLV, if a node wants to advertise values for Fun=
. <br>
&gt; Length and Arg. Length, it also has to advertise values for LB Length =
<br>
&gt; and LN Length.=C2=A0 It seems like a better approach would be to have =
<br>
&gt; different sub-sub-TLVs, one for=C2=A0 LB Length and LN Length, and a s=
eparate <br>
&gt; one for Fun. Length and Arg. Length to be able to better represent thi=
s <br>
&gt; situation.<br>
<br>
<br>
I&#39;m afraid you are missing an important point.<br>
<br>
SRv6 SID is defined as LOC:FUNCT:ARG, where LOC is represented as B:N. <br>
To be able to find out where the func and arg are located, you need to <br>
know the LOC length, e.g. Block and Node length. Advertising just Func <br>
and Arg length does not help.<br>
<br>
<br>
&gt; <br>
&gt; 2) Now consider the situation where a network operator chooses to <br>
&gt; allocate all locators from a single block, so that LB Length and LN <b=
r>
&gt; Length are well-defined across the network.=C2=A0 A given node should =
<br>
&gt; presumably advertise its own understanding of LB Length and LN Length.=
=C2=A0 =C2=A0<br>
&gt; A given node&#39;s understanding of LB Length and LN Length is a prope=
rty of <br>
&gt; the node.=C2=A0 It is not a property of a given End SID.=C2=A0 The cur=
rently <br>
&gt; proposed SRv6 SID Structure Sub-Sub-TLV however is carried within each=
 <br>
&gt; End SID Sub-TLV.=C2=A0 With the currently proposed encoding, presumabl=
y an <br>
&gt; implementation is expected to send the exact same values of LB Length =
<br>
&gt; and LN Length for all of the End SIDs that it advertises.=C2=A0 Not on=
ly is <br>
&gt; this inefficient, but it creates the need for logic to decide what to =
do <br>
&gt; when different End SIDs advertised by the same node carry different <b=
r>
&gt; values of LB Length and LN Length in their sub-sub-TLVs.=C2=A0 It seem=
s like <br>
&gt; a better approach would be for a given node to advertise its <br>
&gt; understanding of the value of LB Length and LN Length in a sub-TLV of =
<br>
&gt; the Router Capability TLV.<br>
<br>
When we design the encoding, we have to define it such, that it supports <b=
r>
all possible use cases. We can not design the encoding that works for <br>
single use case (allocate all locators from a single block) and does not <b=
r>
work for others - different block from different node, multiple blocks <br>
on a single node (e.g. border node), which are all valid.<br>
<br>
&gt; <br>
&gt; 3) At this point, the only use case that has been proposed for floodin=
g <br>
&gt; the LB Length, LN Length, Fun. Length, and Arg. Length to all ISIS <br=
>
&gt; speakers is to make it more convenient for BGP-LS to get those values =
to <br>
&gt; an external controller as part of a topology feed from any ISIS node.=
=C2=A0 <br>
&gt; No use case has been proposed for ISIS speakers themselves to make use=
 <br>
&gt; of the information.=C2=A0 It seems like a more scalable approach would=
 be to <br>
&gt; use BGP-LS sessions to collect the information from the subset of node=
s <br>
&gt; that actually produce the relevant information.=C2=A0 So far there are=
 no End <br>
&gt; SIDs defined that are advertised in ISIS that have a non-zero Arg. <br=
>
&gt; Length.=C2=A0 If an End SID with non-zero Arg. Length were to be propo=
sed in <br>
&gt; the future as needing to be flooded to all ISIS nodes, it seems likely=
 <br>
&gt; that the new End SID would also be advertised using the BGP IP/VPN/EVP=
N <br>
&gt; control plane. =C2=A0 So it seems like a viable alternative for this <=
br>
&gt; hypothetical future End SID would be to have the subset of nodes that =
<br>
&gt; have non-zero Arg. Length values communicate to an external controller=
 <br>
&gt; via=C2=A0 BGP sessions. I think the WG needs a more detailed discussio=
n of a <br>
&gt; concrete use case in order to determine whether flooding LB Length, LN=
 <br>
&gt; Length, Fun. Length, and Arg. Length to all ISIS speakers is really th=
e <br>
&gt; right approach.<br>
<br>
there are networks, where BGP is not deployed on all nodes, only on a <br>
few nodes that re-distribute the information to BGP-LS. In such case we <br=
>
need the IGP to distribute this data.<br>
<br>
Argument that &quot;it seems likely that the new End SID would also be <br>
advertised using the BGP IP/VPN/EVPN&quot; is a wishful thinking that we ca=
n <br>
not based our encoding on.<br>
<br>
<br>
&gt; <br>
&gt; Given the lack of a compelling use case for flooding LB Length, LN <br=
>
&gt; Length, Fun. Length, and Arg. Length to all ISIS speakers and the <br>
&gt; problems with the currently proposed encodings for doing that, I think=
 <br>
&gt; that the SRv6 SID Structure Sub-Sub-TLV should be removed from <br>
&gt; draft-ietf-lsr-isis-srv6-extensions. A mechanism for flooding LB Lengt=
h, <br>
&gt; LN Length, Fun. Length, and Arg. Length to all ISIS speakers can be <b=
r>
&gt; defined in a future document.<br>
<br>
The security use case has already been pointed out earlier in this thread:<=
br>
<br>
<a href=3D"https://tools.ietf.org/html/draft-ietf-6man-segment-routing-head=
er-26#section-5" rel=3D"noreferrer" target=3D"_blank">https://tools.ietf.or=
g/html/draft-ietf-6man-segment-routing-header-26#section-5</a><br>
<br>
Given the arguments I mentioned above, I respectfully disagree with the <br=
>
removal of the SID Structure Sub-Sub-TLV from the ISIS SRv6 draft.<br>
<br>
thanks,<br>
Peter<br>
<br>
<br>
&gt; <br>
&gt; Thanks,<br>
&gt; Chris<br>
&gt; <br>
&gt; On Fri, Mar 13, 2020 at 5:02 AM Peter Psenak &lt;<a href=3D"mailto:pps=
enak@cisco.com" target=3D"_blank">ppsenak@cisco.com</a> <br>
&gt; &lt;mailto:<a href=3D"mailto:ppsenak@cisco.com" target=3D"_blank">ppse=
nak@cisco.com</a>&gt;&gt; wrote:<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0Hi Chris,<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0On 12/03/2020 15:58, Chris Bowers wrote:<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt; Peter,<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt; I think that the SRv6 SID Structure Sub-Sub-T=
LV should be removed<br>
&gt;=C2=A0 =C2=A0 =C2=A0from<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt; draft-ietf-lsr-isis-srv6-extensions.=C2=A0 I =
think that we should<br>
&gt;=C2=A0 =C2=A0 =C2=A0leave the<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt; ability to include sub-sub-TLVs in the SRv6 E=
nd SID Sub-TLV,<br>
&gt;=C2=A0 =C2=A0 =C2=A0End.X SID<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt; Sub-TLV, and LAN End.X SID Sub-TLV in the enc=
odings for those<br>
&gt;=C2=A0 =C2=A0 =C2=A0sub-TLVs.<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt; I don&#39;t think that the current text descr=
ibing the SRv6 SID<br>
&gt;=C2=A0 =C2=A0 =C2=A0Structure<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt; Sub-Sub-TLV would result in interoperable imp=
lementations.=C2=A0 Based<br>
&gt;=C2=A0 =C2=A0 =C2=A0on the<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0SRv6 base spec defines SID B, L, A, F.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0SRv6 protocol specs are advertising these values wi=
th the SRv6 SID,<br>
&gt;=C2=A0 =C2=A0 =C2=A0they<br>
&gt;=C2=A0 =C2=A0 =C2=A0don&#39;t use them. The usage is outside of the sco=
pe of the protocol<br>
&gt;=C2=A0 =C2=A0 =C2=A0drafts. What exactly is the problem?<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0thanks,<br>
&gt;=C2=A0 =C2=A0 =C2=A0Peter<br>
&gt; <br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt; discussion with Ketan below, it appears that =
use cases for ISIS<br>
&gt;=C2=A0 =C2=A0 =C2=A0speakers<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt; receiving advertised values of LB Length, LN =
Length, Fun. Length,<br>
&gt;=C2=A0 =C2=A0 =C2=A0and<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt; Arg. Length are not currently well-defined. =
=C2=A0=C2=A0 So I think it<br>
&gt;=C2=A0 =C2=A0 =C2=A0makes sense<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt; to defer the definition of the SRv6 SID Struc=
ture Sub-Sub-TLV to a<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt; future document.<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt; Thanks,<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt; Chris<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt; On Thu, Mar 12, 2020 at 6:02 AM Ketan Talauli=
kar (ketant)<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt; &lt;<a href=3D"mailto:ketant@cisco.com" targe=
t=3D"_blank">ketant@cisco.com</a> &lt;mailto:<a href=3D"mailto:ketant@cisco=
.com" target=3D"_blank">ketant@cisco.com</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:ketant@cisco.com" targ=
et=3D"_blank">ketant@cisco.com</a> &lt;mailto:<a href=3D"mailto:ketant@cisc=
o.com" target=3D"_blank">ketant@cisco.com</a>&gt;&gt;&gt; wrote:<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0Hi Chris,____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0__ __<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0Dropping the draft-ietf-sp=
ring-srv6-network-programming authors<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0since we are now back to d=
iscussing the ISIS extensions.____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0__ __<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0Please check inline below.=
____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0__ __<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0*From:*Chris Bowers &lt;<a=
 href=3D"mailto:chrisbowers.ietf@gmail.com" target=3D"_blank">chrisbowers.i=
etf@gmail.com</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:chrisbowers.ietf@gmail=
.com" target=3D"_blank">chrisbowers.ietf@gmail.com</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mail=
to:chrisbowers.ietf@gmail.com" target=3D"_blank">chrisbowers.ietf@gmail.com=
</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:chrisbowers.ietf@gmail=
.com" target=3D"_blank">chrisbowers.ietf@gmail.com</a>&gt;&gt;&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0*Sent:* 05 March 2020 21:5=
3<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0*To:* Ketan Talaulikar (ke=
tant) &lt;<a href=3D"mailto:ketant@cisco.com" target=3D"_blank">ketant@cisc=
o.com</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:ketant@cisco.com" targ=
et=3D"_blank">ketant@cisco.com</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mail=
to:ketant@cisco.com" target=3D"_blank">ketant@cisco.com</a> &lt;mailto:<a h=
ref=3D"mailto:ketant@cisco.com" target=3D"_blank">ketant@cisco.com</a>&gt;&=
gt;&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0*Cc:* Ketan Talaulikar (ke=
tant) &lt;<a href=3D"mailto:ketant@cisco.com" target=3D"_blank">ketant@cisc=
o.com</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:ketant@cisco.com" targ=
et=3D"_blank">ketant@cisco.com</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mail=
to:ketant@cisco.com" target=3D"_blank">ketant@cisco.com</a> &lt;mailto:<a h=
ref=3D"mailto:ketant@cisco.com" target=3D"_blank">ketant@cisco.com</a>&gt;&=
gt;&gt;;<br>
&gt;=C2=A0 =C2=A0 =C2=A0<a href=3D"mailto:lsr@ietf.org" target=3D"_blank">l=
sr@ietf.org</a> &lt;mailto:<a href=3D"mailto:lsr@ietf.org" target=3D"_blank=
">lsr@ietf.org</a>&gt; &lt;mailto:<a href=3D"mailto:lsr@ietf.org" target=3D=
"_blank">lsr@ietf.org</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:lsr@ietf.org" target=
=3D"_blank">lsr@ietf.org</a>&gt;&gt;;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0SPRING WG List &lt;<a href=
=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a> &lt;mailt=
o:<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a>&=
gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:spring@ietf.org" targe=
t=3D"_blank">spring@ietf.org</a> &lt;mailto:<a href=3D"mailto:spring@ietf.o=
rg" target=3D"_blank">spring@ietf.org</a>&gt;&gt;&gt;;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0draft-ietf-spring-srv6-net=
work-programming<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0&lt;<a href=3D"mailto:draf=
t-ietf-spring-srv6-network-programming@ietf.org" target=3D"_blank">draft-ie=
tf-spring-srv6-network-programming@ietf.org</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:draft-ietf-spring-srv6=
-network-programming@ietf.org" target=3D"_blank">draft-ietf-spring-srv6-net=
work-programming@ietf.org</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mail=
to:draft-ietf-spring-srv6-network-programming@ietf.org" target=3D"_blank">d=
raft-ietf-spring-srv6-network-programming@ietf.org</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:draft-ietf-spring-srv6=
-network-programming@ietf.org" target=3D"_blank">draft-ietf-spring-srv6-net=
work-programming@ietf.org</a>&gt;&gt;&gt;; Peter<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0Psenak (ppsenak) &lt;<a hr=
ef=3D"mailto:ppsenak@cisco.com" target=3D"_blank">ppsenak@cisco.com</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:ppsenak@cisco.com" tar=
get=3D"_blank">ppsenak@cisco.com</a>&gt; &lt;mailto:<a href=3D"mailto:ppsen=
ak@cisco.com" target=3D"_blank">ppsenak@cisco.com</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:ppsenak@cisco.com" tar=
get=3D"_blank">ppsenak@cisco.com</a>&gt;&gt;&gt;;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0Bruno Decraene &lt;<a href=
=3D"mailto:bruno.decraene@orange.com" target=3D"_blank">bruno.decraene@oran=
ge.com</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:bruno.decraene@orange.=
com" target=3D"_blank">bruno.decraene@orange.com</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mail=
to:bruno.decraene@orange.com" target=3D"_blank">bruno.decraene@orange.com</=
a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:bruno.decraene@orange.=
com" target=3D"_blank">bruno.decraene@orange.com</a>&gt;&gt;&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0*Subject:* Re: [Lsr] clari=
fication of locator block and<br>
&gt;=C2=A0 =C2=A0 =C2=A0locator node<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0in draft-ietf-spring-srv6-=
network-programming and<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0draft-ietf-lsr-isis-srv6-e=
xtensions____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0__ __<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0Ketan,____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0__ __<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0See inline [CB].____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0__ __<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0On Wed, Mar 4, 2020 at 12:=
36 AM Ketan Talaulikar (ketant)<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0&lt;<a href=3D"mailto:keta=
nt@cisco.com" target=3D"_blank">ketant@cisco.com</a> &lt;mailto:<a href=3D"=
mailto:ketant@cisco.com" target=3D"_blank">ketant@cisco.com</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:ketant@cisco.com" targ=
et=3D"_blank">ketant@cisco.com</a> &lt;mailto:<a href=3D"mailto:ketant@cisc=
o.com" target=3D"_blank">ketant@cisco.com</a>&gt;&gt;&gt; wrote:____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hi Chris,___=
_<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0You are righ=
t in that there is no assumption that all SRv6<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0locators in =
a domain are allocated from the same block.<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Therefore kn=
owing the blocks used in the domain is<br>
&gt;=C2=A0 =C2=A0 =C2=A0useful.____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0[CB] Since you refer to &q=
uot;blocks&quot; (plural) in this sentence,<br>
&gt;=C2=A0 =C2=A0 =C2=A0are you<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0saying that in the scenari=
o where all SRv6 locators in a<br>
&gt;=C2=A0 =C2=A0 =C2=A0domain are<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0not allocated from the sam=
e block, you would expect different<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0routers in the same domain=
 to advertise different values of B<br>
&gt;=C2=A0 =C2=A0 =C2=A0and N?<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0*/[KT] While personally I =
believe it would not be the usual<br>
&gt;=C2=A0 =C2=A0 =C2=A0case, it<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0is left to the operator.__=
__/*<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0*/__ __/*<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0For example, assume we hav=
e a network where all SRv6 locators<br>
&gt;=C2=A0 =C2=A0 =C2=A0in a<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0domain are not allocated f=
rom the same block.=C2=A0 Router A<br>
&gt;=C2=A0 =C2=A0 =C2=A0advertises<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0an SRv6 Locator TLV with l=
ocator =3D 2000::/64, and an SRv6 End SID<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0sub-TLV with some endpoint=
 behavior. Router B advertises an SRv6<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0Locator TLV with locator =
=3D 3000::/64, and an SRv6 End SID sub-TLV<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0with some endpoint behavio=
r. What should routers A and B<br>
&gt;=C2=A0 =C2=A0 =C2=A0advertise<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0as the values of B and N i=
n their SRv6 SID Structure<br>
&gt;=C2=A0 =C2=A0 =C2=A0Sub-Sub-TLVs ?____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0*/[KT] It is difficult for=
 me to figure out what the block<br>
&gt;=C2=A0 =C2=A0 =C2=A0and node<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0parts are with such an add=
ressing./*____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0The IGP draf=
ts covers the advertisement of the B and N<br>
&gt;=C2=A0 =C2=A0 =C2=A0parts of<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0the locally =
configured locator on the node via IGPs. On the<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0receiver sid=
e, the IGP may not really do much with this<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0information,=
 however it enables propagation of this<br>
&gt;=C2=A0 =C2=A0 =C2=A0information<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0from all nod=
es in the network to be advertised out via BGP-LS<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0(or other me=
chanisms) as part of the topology feed. Once<br>
&gt;=C2=A0 =C2=A0 =C2=A0this is<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0part of the =
topology feed, it enables use-cases on<br>
&gt;=C2=A0 =C2=A0 =C2=A0controllers<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0to perform n=
etwork wide validation of the SRv6 SID block<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0provisioning=
 and can also help in automation of the security<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0aspects desc=
ribed in<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0<a href=3D"https://tools.ietf.org/html/draft-ietf-6=
man-segment-routing-header-26#section-5____" rel=3D"noreferrer" target=3D"_=
blank">https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-2=
6#section-5____</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0[CB] If an ISIS speaker is=
 not expected to do anything with B<br>
&gt;=C2=A0 =C2=A0 =C2=A0and N,<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0then I think the text in d=
raft-ietf-lsr-isis-srv6-extensions<br>
&gt;=C2=A0 =C2=A0 =C2=A0needs<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0to clarify this.=C2=A0 I h=
ave a similar observation about Fun.<br>
&gt;=C2=A0 =C2=A0 =C2=A0Length and<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0Arg. Length in the SRv6 SI=
D Structure Sub-Sub-TLV .=C2=A0 As far<br>
&gt;=C2=A0 =C2=A0 =C2=A0as I can<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0tell, none of the endpoint=
 behaviors that are currently<br>
&gt;=C2=A0 =C2=A0 =C2=A0specified to<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0be carried in ISIS End, En=
d.X, and LAN End.X SIDs sub-TLVs<br>
&gt;=C2=A0 =C2=A0 =C2=A0uses an<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0Argument, so there is neve=
r a case where an SRv6 SID Structure<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0Sub-Sub-TLV should have a =
non-zero value for Arg. Length. What<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0should an ISIS speaker do =
if it receives a non-zero value of the<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0Arg. Length for an endpoin=
t behavior that doesn&#39;t use an<br>
&gt;=C2=A0 =C2=A0 =C2=A0argument?<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0Are there any use cases en=
visioned where an ISIS speaker needs to<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0know the Arg. Length ? ___=
_<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0*/[KT] The behaviors curre=
ntly listed in the draft do not have an<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0argument nor is the use of=
 B and N required for them. We cannot<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0preclude a future use-case=
 or extension where such behaviors<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0introduced are also applic=
able to ISIS. So IMHO ruling such<br>
&gt;=C2=A0 =C2=A0 =C2=A0aspects<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0out might not be the right=
 thing to do from a protocol<br>
&gt;=C2=A0 =C2=A0 =C2=A0extensibility<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0perspective.____/*<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0*/__ __/*<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0*/Thanks,____/*<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0*/Ketan/*____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0__ __<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Thanks,____<=
br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Ketan____<br=
>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*From:*Chris=
 Bowers &lt;<a href=3D"mailto:chrisbowers.ietf@gmail.com" target=3D"_blank"=
>chrisbowers.ietf@gmail.com</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:chrisbowers.ietf@gmail=
.com" target=3D"_blank">chrisbowers.ietf@gmail.com</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&lt;mailto:<=
a href=3D"mailto:chrisbowers.ietf@gmail.com" target=3D"_blank">chrisbowers.=
ietf@gmail.com</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:chrisbowers.ietf@gmail=
.com" target=3D"_blank">chrisbowers.ietf@gmail.com</a>&gt;&gt;&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*Sent:* 02 M=
arch 2020 23:39<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*To:* Ketan =
Talaulikar (ketant) &lt;<a href=3D"mailto:ketant@cisco.com" target=3D"_blan=
k">ketant@cisco.com</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:ketant@cisco.com" targ=
et=3D"_blank">ketant@cisco.com</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&lt;mailto:<=
a href=3D"mailto:ketant@cisco.com" target=3D"_blank">ketant@cisco.com</a> &=
lt;mailto:<a href=3D"mailto:ketant@cisco.com" target=3D"_blank">ketant@cisc=
o.com</a>&gt;&gt;&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*Cc:* Ketan =
Talaulikar (ketant)<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&lt;ketant=
=3D<a href=3D"mailto:40cisco.com@dmarc.ietf.org" target=3D"_blank">40cisco.=
com@dmarc.ietf.org</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:40cisco.com@dmarc.ietf=
.org" target=3D"_blank">40cisco.com@dmarc.ietf.org</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&lt;mailto:<=
a href=3D"mailto:40cisco..com@dmarc.ietf.org" target=3D"_blank">40cisco..co=
m@dmarc.ietf.org</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:40cisco..com@dmarc.iet=
f.org" target=3D"_blank">40cisco..com@dmarc.ietf.org</a>&gt;&gt;&gt;; <a hr=
ef=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:lsr@ietf.org" target=
=3D"_blank">lsr@ietf.org</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&lt;mailto:<=
a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</a> &lt;mailt=
o:<a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</a>&gt;&gt=
;; SPRING WG<br>
&gt;=C2=A0 =C2=A0 =C2=A0List &lt;<a href=3D"mailto:spring@ietf.org" target=
=3D"_blank">spring@ietf.org</a> &lt;mailto:<a href=3D"mailto:spring@ietf.or=
g" target=3D"_blank">spring@ietf.org</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&lt;mailto:<=
a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org</a> &lt=
;mailto:<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.or=
g</a>&gt;&gt;&gt;;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-ietf-s=
pring-srv6-network-programming<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&lt;<a href=
=3D"mailto:draft-ietf-spring-srv6-network-programming@ietf.org" target=3D"_=
blank">draft-ietf-spring-srv6-network-programming@ietf.org</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:draft-ietf-spring-srv6=
-network-programming@ietf.org" target=3D"_blank">draft-ietf-spring-srv6-net=
work-programming@ietf.org</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:draft-ietf-spri=
ng-srv6-network-programming@ietf.org" target=3D"_blank">draft-ietf-spring-s=
rv6-network-programming@ietf.org</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:draft-ietf-spring-srv6=
-network-programming@ietf.org" target=3D"_blank">draft-ietf-spring-srv6-net=
work-programming@ietf.org</a>&gt;&gt;&gt;;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Peter Psenak=
 (ppsenak) &lt;<a href=3D"mailto:ppsenak@cisco.com" target=3D"_blank">ppsen=
ak@cisco.com</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:ppsenak@cisco.com" tar=
get=3D"_blank">ppsenak@cisco.com</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&lt;mailto:<=
a href=3D"mailto:ppsenak@cisco.com" target=3D"_blank">ppsenak@cisco.com</a>=
 &lt;mailto:<a href=3D"mailto:ppsenak@cisco.com" target=3D"_blank">ppsenak@=
cisco.com</a>&gt;&gt;&gt;;<br>
&gt;=C2=A0 =C2=A0 =C2=A0Bruno Decraene<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&lt;<a href=
=3D"mailto:bruno.decraene@orange.com" target=3D"_blank">bruno.decraene@oran=
ge.com</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:bruno.decraene@orange.=
com" target=3D"_blank">bruno.decraene@orange.com</a>&gt; &lt;mailto:<a href=
=3D"mailto:bruno.decraene@orange.com" target=3D"_blank">bruno.decraene@oran=
ge.com</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:bruno.decraene@orange.=
com" target=3D"_blank">bruno.decraene@orange.com</a>&gt;&gt;&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0*Subject:* R=
e: [Lsr] clarification of locator block and<br>
&gt;=C2=A0 =C2=A0 =C2=A0locator<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0node in draf=
t-ietf-spring-srv6-network-programming and<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-ietf-l=
sr-isis-srv6-extensions____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Ketan,____<b=
r>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Based on cur=
rent documents, allocating all SRv6 locators<br>
&gt;=C2=A0 =C2=A0 =C2=A0used in<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0a domain fro=
m a single block is optional.____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0However, ass=
uming for the moment that a network operator has<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0chosen to al=
locate all SRv6 locators used in a domain from a<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0single block=
, so that there is a well-defined value of B<br>
&gt;=C2=A0 =C2=A0 =C2=A0and N<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0across a dom=
ain, what is the use of having a router advertise<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0its own unde=
rstanding of these two values?=C2=A0 And what is a<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0receiver sup=
posed to do with this information?____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Thanks,____<=
br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Chris____<br=
>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0On Fri, Feb =
28, 2020 at 8:23 AM<br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;<a href=3D"mailto:bruno.decraene@orange.com" ta=
rget=3D"_blank">bruno.decraene@orange.com</a> &lt;mailto:<a href=3D"mailto:=
bruno.decraene@orange.com" target=3D"_blank">bruno.decraene@orange.com</a>&=
gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&lt;mailto:<=
a href=3D"mailto:bruno.decraene@orange.com" target=3D"_blank">bruno.decraen=
e@orange.com</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:bruno.decraene@orange.=
com" target=3D"_blank">bruno.decraene@orange.com</a>&gt;&gt;&gt; wrote:____=
<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0Hi Ketan,____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0Thanks fort the follow up.____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0Clarification inline [Bruno]____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0*From**:*Ketan Talaulikar (ketant)<br>
&gt;=C2=A0 =C2=A0 =C2=A0[mailto:<a href=3D"mailto:ketant@cisco.com" target=
=3D"_blank">ketant@cisco.com</a> &lt;mailto:<a href=3D"mailto:ketant@cisco.=
com" target=3D"_blank">ketant@cisco.com</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0&lt;mailto:<a href=3D"mailto:ketant@cisco.com" target=3D"_blank">ketant@=
cisco.com</a> &lt;mailto:<a href=3D"mailto:ketant@cisco.com" target=3D"_bla=
nk">ketant@cisco.com</a>&gt;&gt;]<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0*Sent:* Friday, February 28, 2020 11:11 AM<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0*To:* DECRAENE Bruno TGI/OLN; Ketan Talaulikar (ketant);<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0Chris Bowers<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0*Cc:* <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</a>=
 &lt;mailto:<a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org<=
/a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:lsr@ietf.org" target=
=3D"_blank">lsr@ietf.org</a> &lt;mailto:<a href=3D"mailto:lsr@ietf.org" tar=
get=3D"_blank">lsr@ietf.org</a>&gt;&gt;; SPRING WG List;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0draft-ietf-spring-srv6-network-programming; Peter Psenak<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0(ppsenak)<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0*Subject:* RE: [Lsr] clarification of locator block and<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0locator node in<br>
&gt;=C2=A0 =C2=A0 =C2=A0draft-ietf-spring-srv6-network-programming<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0and draft-ietf-lsr-isis-srv6-extensions____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0Hi Bruno,____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0I believe the description and usage of Locator is<br>
&gt;=C2=A0 =C2=A0 =C2=A0very well<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0described and covered in the net-pgm draft as also the<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0corresponding IGP extensions. Is the question is more<br>
&gt;=C2=A0 =C2=A0 =C2=A0about<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0the =E2=80=9Cblock=E2=80=9D part of it (what is not in the block part<br=
>
&gt;=C2=A0 =C2=A0 =C2=A0is in<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0the node part as per the text in the net-pgm draft)?____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0The =E2=80=9Cblock=E2=80=9D is again not a new thing. Please check the<b=
r>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0following:____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0Under<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0<a href=3D"https://tools.ietf.org/html/draft-ietf-6=
man-segment-routing-header-26#section-5" rel=3D"noreferrer" target=3D"_blan=
k">https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#se=
ction-5</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0=E2=80=A6 look for =E2=80=9Cblock=E2=80=9D____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt; <a href=3D"https://tools.ietf.org/html/rfc840=
2#section-2" rel=3D"noreferrer" target=3D"_blank">https://tools.ietf.org/ht=
ml/rfc8402#section-2</a> =E2=80=A6 look under<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0SRGB for SRv6____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0[Bruno]____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0To clarify, my question was not specific to =E2=80=9Cblock=E2=80=9D but<=
br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0related to the usage, by the receiver, of the following<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0piece of information:____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 LB Length: SRv6 SID Locator Block length=
____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 LN Length: SRv6 SID Locator Node length_=
___<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Fun. Length: SRv6 SID Function length___=
_<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Arg. Length: SRv6 SID Arguments length__=
__<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0So perhaps I don=E2=80=99t get Chris=E2=80=99s point and would wait<br>
&gt;=C2=A0 =C2=A0 =C2=A0for him<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0to clarify.____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0[Bruno] I=E2=80=99ll leave this to Chris.____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0Thanks,____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0Ketan____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0*From:*Lsr &lt;<a href=3D"mailto:lsr-bounces@ietf.org" target=3D"_blank"=
>lsr-bounces@ietf.org</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:lsr-bounces@ietf.org" =
target=3D"_blank">lsr-bounces@ietf.org</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0&lt;mailto:<a href=3D"mailto:lsr-bounces@ietf.org" target=3D"_blank">lsr=
-bounces@ietf.org</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:lsr-bounces@ietf.org" =
target=3D"_blank">lsr-bounces@ietf.org</a>&gt;&gt;&gt; *On Behalf Of<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0*<a href=3D"mailto:bruno.decraene@orange.com" target=3D"_blank">bruno.de=
craene@orange.com</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:bruno.decraene@orange.=
com" target=3D"_blank">bruno.decraene@orange.com</a>&gt; &lt;mailto:<a href=
=3D"mailto:bruno.decraene@orange.com" target=3D"_blank">bruno.decraene@oran=
ge.com</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:bruno.decraene@orange.=
com" target=3D"_blank">bruno.decraene@orange.com</a>&gt;&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0*Sent:* 28 February 2020 14:34<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0*To:* Ketan Talaulikar (ketant)<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0&lt;ketant=3D<a href=3D"mailto:40cisco.com@dmarc.ietf.org" target=3D"_bl=
ank">40cisco.com@dmarc.ietf.org</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:40cisco.com@dmarc.ietf=
.org" target=3D"_blank">40cisco.com@dmarc.ietf.org</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0&lt;mailto:<a href=3D"mailto:40cisco..com@dmarc.ietf.org" target=3D"_bla=
nk">40cisco..com@dmarc.ietf.org</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:40cisco..com@dmarc.iet=
f.org" target=3D"_blank">40cisco..com@dmarc.ietf.org</a>&gt;&gt;&gt;; Chris=
 Bowers<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0&lt;<a href=3D"mailto:chrisbowers.ietf@gmail.com" target=3D"_blank">chri=
sbowers.ietf@gmail.com</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:chrisbowers.ietf@gmail=
.com" target=3D"_blank">chrisbowers.ietf@gmail.com</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:chrisbowers.ietf@gmail=
.com" target=3D"_blank">chrisbowers.ietf@gmail.com</a> &lt;mailto:<a href=
=3D"mailto:chrisbowers.ietf@gmail.com" target=3D"_blank">chrisbowers.ietf@g=
mail.com</a>&gt;&gt;&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0*Cc:* <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</a>=
 &lt;mailto:<a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org<=
/a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:lsr@ietf.org" target=
=3D"_blank">lsr@ietf.org</a> &lt;mailto:<a href=3D"mailto:lsr@ietf.org" tar=
get=3D"_blank">lsr@ietf.org</a>&gt;&gt;; SPRING WG List<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0&lt;<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org=
</a> &lt;mailto:<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring=
@ietf.org</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:spring@ietf.org" targe=
t=3D"_blank">spring@ietf.org</a> &lt;mailto:<a href=3D"mailto:spring@ietf.o=
rg" target=3D"_blank">spring@ietf.org</a>&gt;&gt;&gt;;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0draft-ietf-spring-srv6-network-programming<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0&lt;<a href=3D"mailto:draft-ietf-spring-srv6-network-programming@ietf.or=
g" target=3D"_blank">draft-ietf-spring-srv6-network-programming@ietf.org</a=
><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:draft-ietf-spring-srv6=
-network-programming@ietf.org" target=3D"_blank">draft-ietf-spring-srv6-net=
work-programming@ietf.org</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:draft-ietf-spri=
ng-srv6-network-programming@ietf.org" target=3D"_blank">draft-ietf-spring-s=
rv6-network-programming@ietf.org</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:draft-ietf-spring-srv6=
-network-programming@ietf.org" target=3D"_blank">draft-ietf-spring-srv6-net=
work-programming@ietf.org</a>&gt;&gt;&gt;;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0Peter Psenak (ppsenak) &lt;<a href=3D"mailto:ppsenak@cisco.com" target=
=3D"_blank">ppsenak@cisco.com</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:ppsenak@cisco.com" tar=
get=3D"_blank">ppsenak@cisco.com</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0&lt;mailto:<a href=3D"mailto:ppsenak@cisco.com" target=3D"_blank">ppsena=
k@cisco.com</a> &lt;mailto:<a href=3D"mailto:ppsenak@cisco.com" target=3D"_=
blank">ppsenak@cisco.com</a>&gt;&gt;&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0*Subject:* Re: [Lsr] clarification of locator block and<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0locator node in<br>
&gt;=C2=A0 =C2=A0 =C2=A0draft-ietf-spring-srv6-network-programming<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0and draft-ietf-lsr-isis-srv6-extensions____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0Hi Ketan,____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0*From:*Lsr [mailto:<a href=3D"mailto:lsr-bounces@ietf.org" target=3D"_bl=
ank">lsr-bounces@ietf.org</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:lsr-bounces@ietf.org" =
target=3D"_blank">lsr-bounces@ietf.org</a>&gt;] *On Behalf Of<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0*Ketan Talaulikar (ketant)<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0*Sent:* Friday, February 28, 2020 6:30 AM____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0Hi Chris,____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0I agree with Peter and I would suggest to drop LSR since<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0this is not a protocol specific thing.____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0I believe the text in<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0draft-ietf-spring-srv6-network-programming clears<br>
&gt;=C2=A0 =C2=A0 =C2=A0says what<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0locator block and locator node are. What more details<br>
&gt;=C2=A0 =C2=A0 =C2=A0do you<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0think are required?____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0[Bruno] Speaking as an individual, the draft could<br>
&gt;=C2=A0 =C2=A0 =C2=A0possibly<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0clarify the usage of these information/fields by the<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0receiver. Possibly using the same name/term (e.g.<br>
&gt;=C2=A0 =C2=A0 =C2=A0SRv6 SID<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0Locator Block length) to ease the references between both<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0drafts.____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0Thanks,____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0--Bruno____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0Thanks,____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0Ketan____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0*From:*Lsr &lt;<a href=3D"mailto:lsr-bounces@ietf.org" target=3D"_blank"=
>lsr-bounces@ietf.org</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:lsr-bounces@ietf.org" =
target=3D"_blank">lsr-bounces@ietf.org</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0&lt;mailto:<a href=3D"mailto:lsr-bounces@ietf.org" target=3D"_blank">lsr=
-bounces@ietf.org</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:lsr-bounces@ietf.org" =
target=3D"_blank">lsr-bounces@ietf.org</a>&gt;&gt;&gt; *On Behalf Of *Chris=
 Bowers<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0*Sent:* 27 February 2020 22:46<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0*To:* <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</a>=
 &lt;mailto:<a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org<=
/a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:lsr@ietf.org" target=
=3D"_blank">lsr@ietf.org</a> &lt;mailto:<a href=3D"mailto:lsr@ietf.org" tar=
get=3D"_blank">lsr@ietf.org</a>&gt;&gt;; SPRING WG List<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0&lt;<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring@ietf.org=
</a> &lt;mailto:<a href=3D"mailto:spring@ietf.org" target=3D"_blank">spring=
@ietf.org</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:spring@ietf.org" targe=
t=3D"_blank">spring@ietf.org</a> &lt;mailto:<a href=3D"mailto:spring@ietf.o=
rg" target=3D"_blank">spring@ietf.org</a>&gt;&gt;&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0*Cc:* Peter Psenak (ppsenak) &lt;<a href=3D"mailto:ppsenak@cisco.com" ta=
rget=3D"_blank">ppsenak@cisco.com</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:ppsenak@cisco.com" tar=
get=3D"_blank">ppsenak@cisco.com</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0&lt;mailto:<a href=3D"mailto:ppsenak@cisco.com" target=3D"_blank">ppsena=
k@cisco.com</a> &lt;mailto:<a href=3D"mailto:ppsenak@cisco.com" target=3D"_=
blank">ppsenak@cisco.com</a>&gt;&gt;&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0*Subject:* [Lsr] clarification of locator block and<br>
&gt;=C2=A0 =C2=A0 =C2=A0locator<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0node in draft-ietf-spring-srv6-network-programming and<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0draft-ietf-lsr-isis-srv6-extensions____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0SPRING and LSR WGs,____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0I think that we need a much more detailed description<br>
&gt;=C2=A0 =C2=A0 =C2=A0of the<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0locator block and locator node in either<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0draft-ietf-spring-srv6-network-programming or<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0draft-ietf-lsr-isis-srv6-extensions.=C2=A0 See original email<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0below.____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0Thanks,____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0Chris____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0On Thu, Feb 27, 2020 at 11:08 AM Peter Psenak<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0&lt;<a href=3D"mailto:ppsenak@cisco.com" target=3D"_blank">ppsenak@cisco=
.com</a> &lt;mailto:<a href=3D"mailto:ppsenak@cisco.com" target=3D"_blank">=
ppsenak@cisco.com</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0&lt;mailto:<a href=3D"mailto:ppsenak@cisco.com" tar=
get=3D"_blank">ppsenak@cisco.com</a> &lt;mailto:<a href=3D"mailto:ppsenak@c=
isco.com" target=3D"_blank">ppsenak@cisco.com</a>&gt;&gt;&gt; wrote:____<br=
>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0Hi Chris,<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0On 27/02/2020 17:54, Chris Bowers wrote:<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 &gt; LSR WG,<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 &gt; Section 9 of<br>
&gt;=C2=A0 =C2=A0 =C2=A0draft-ietf-lsr-isis-srv6-extensions-05<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0defines the=C2=A0 SRv6<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 &gt; SID Structure Sub-Sub-TLV. In particular, it<br>
&gt;=C2=A0 =C2=A0 =C2=A0defines<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0encoding for the<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 &gt; locator block length and the locator node length.<br=
>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0The text refers to<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 &gt; [I-D.ietf-spring-srv6-network-programming] for the<b=
r>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0definition of these<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 &gt; concepts.<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 &gt; As far as I can tell, the only reference to<br>
&gt;=C2=A0 =C2=A0 =C2=A0locator<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0block and locator<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 &gt; node in<br>
&gt;=C2=A0 =C2=A0 =C2=A0draft-ietf-spring-srv6-network-programming-10<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0is section 3.1<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 &gt; which has the following text:<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0A locator may be represented as B=
:N where B is<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0the SRv6 SID block<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0(IPv6 subnet allocated for SRv6 S=
IDs by the<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0operator) and N is the<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0identifier of the parent node<br>
&gt;=C2=A0 =C2=A0 =C2=A0instantiating the<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0SID...<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 &gt; I think that we need a much more detailed<br>
&gt;=C2=A0 =C2=A0 =C2=A0description<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0of the locator<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 &gt; block and locator node.<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0sure, but that would be in the<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0draft-ietf-spring-srv6-network-programming-10, not in<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0draft-ietf-lsr-isis-srv6-extensions, as these are<br>
&gt;=C2=A0 =C2=A0 =C2=A0not a<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0protocol<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0specific constructs.<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0thanks,<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0Peter<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 &gt; Thanks,<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 &gt; Chris<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0 =C2=A0 =C2=A0 &gt; ____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0____________________________________________=
___________________________________________________________________________=
______<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0Ce message et ses pieces jointes peuvent contenir des<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0informations confidentielles ou privilegiees et ne<br>
&gt;=C2=A0 =C2=A0 =C2=A0doivent donc____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0pas etre diffuses, exploites ou copies sans<br>
&gt;=C2=A0 =C2=A0 =C2=A0autorisation. Si<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0vous avez recu ce message par erreur, veuillez le<br>
&gt;=C2=A0 =C2=A0 =C2=A0signaler____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0a l&#39;expediteur et le detruire ainsi que les pieces<br>
&gt;=C2=A0 =C2=A0 =C2=A0jointes.<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0Les messages electroniques etant susceptibles<br>
&gt;=C2=A0 =C2=A0 =C2=A0d&#39;alteration,____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0Orange decline toute responsabilite si ce message a ete<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0altere, deforme ou falsifie. Merci.____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=
=A0____<br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt;<br>
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</blockquote></div></div>

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From: wangyali <wangyali11@huawei.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, Christian Hopps <chopps@chopps.org>
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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charse=
t=3DUTF-8"><style>body { line-height: 1.5; }blockquote { margin-top: 0px; =
margin-bottom: 0px; margin-left: 0.5em; }p { margin-top: 0px; margin-botto=
m: 0px; }body { font-size: 10.5pt; font-family: 'Microsoft YaHei UI'; colo=
r: rgb(0, 0, 0); line-height: 1.5; }body { font-size: 10.5pt; font-family:=
 'Microsoft YaHei UI'; color: rgb(0, 0, 0); line-height: 1.5; }</style></h=
ead><body>=0A<div><span></span></div><div><span style=3D"font-size: 15px;"=
><div style=3D"margin: 10px;"><div><span style=3D"line-height: 1.5; backgr=
ound-color: transparent;">Gyan,</span></div><div><div><span style=3D"line-=
height: 20px;">Thanks a lot for your review and comments. I agree with you=
r summary of the basic concept in enhanced VPN framework draft. It is abou=
t the integration of overlay and a subset of underlay network topology and=
 resource to provide the required service connectivity and performance ass=
urance.</span></div><div><span style=3D"line-height: 20px;">&nbsp;</span><=
/div><div><span style=3D"line-height: 20px;">Source routing with current S=
R-MPLS or SRv6 is one important feature to achieve service path customizat=
ion, and the color based matching of services to SR policy is useful in ge=
neral. While performance assurance requires additional capability such as =
resource management and reservation on paths or virtual networks used for =
different services. I think existing SR mechanism needs to be enhanced to =
support resource awareness and provide resource guaranteed SR paths or vir=
tual networks. These are described in draft-dong-spring-sr-enhanced-vpn. Y=
ou can also review it if you like.&nbsp;</span></div><div><span style=3D"l=
ine-height: 20px;"><br></span></div><div><span style=3D"line-height: 20px;=
">Thanks.</span></div><div><span style=3D"line-height: 20px;"><br></span><=
/div><div><span style=3D"line-height: 20px;">Chongfeng</span></div></div><=
/div></span></div><blockquote style=3D"margin-Top: 0px; margin-Bottom: 0px=
; margin-Left: 0.5em"><div><span style=3D"font-size: 16px;">&nbsp;</span><=
/div><div><br></div><div><br></div><div style=3D"border:none;border-top:so=
lid #B5C4DF 1.0pt;padding:3.0pt 0cm 0cm 0cm"><div style=3D"PADDING-RIGHT: =
8px; PADDING-LEFT: 8px; FONT-SIZE: 12px;FONT-FAMILY:tahoma;COLOR:#000000; =
BACKGROUND: #efefef; PADDING-BOTTOM: 8px; PADDING-TOP: 8px"><div><b>From:<=
/b>&nbsp;<a href=3D"mailto:hayabusagsm@gmail.com">Gyan Mishra</a></div><di=
v><b>Date:</b>&nbsp;2020-03-30&nbsp;05:13</div><div><b>To:</b>&nbsp;<a hre=
f=3D"mailto:tonysietf@gmail.com">Tony Przygienda</a></div><div><b>CC:</b>&=
nbsp;<a href=3D"mailto:wangaijun@tsinghua.org.cn">Aijun Wang</a>; <a href=
=3D"mailto:jie.dong@huawei.com">Dongjie (Jimmy)</a>; <a href=3D"mailto:gin=
sberg=3D40cisco.com@dmarc.ietf.org">Les Ginsberg (ginsberg)</a>; <a href=
=3D"mailto:ginsberg@cisco.com">Les Ginsberg (ginsberg)</a>; <a href=3D"mai=
lto:ppsenak=3D40cisco.com@dmarc.ietf.org">Peter Psenak</a>; <a href=3D"mai=
lto:lsr@ietf.org">lsr@ietf.org</a>; <a href=3D"mailto:peng.shaofu@zte.com.=
cn">peng.shaofu@zte.com.cn</a>; <a href=3D"mailto:xiechf@chinatelecom.cn">=
xiechf@chinatelecom.cn</a></div><div><b>Subject:</b>&nbsp;Re: [Lsr] Using =
IS-IS Multi-Topology (MT) for Segment Routing basedVirtual Transport Netwo=
rk</div></div></div><div><div class=3D"FoxDiv20200402092658740858"><div><b=
r></div><div dir=3D"auto">Hi&nbsp;<span style=3D"color:rgb(49,49,49);word-=
spacing:1px">Chongfeng &amp; Jie&nbsp;</span></div><div dir=3D"auto"><span=
 style=3D"color:rgb(49,49,49);word-spacing:1px"><br></span></div><div dir=
=3D"auto">I read through this draft which is referenced in the MT draft wh=
ich is a good to read first to provide context as to what you are trying t=
o accomplish with VPN+ idea.</div><div dir=3D"auto"><br></div><div dir=3D"=
auto"><div><a href=3D"https://tools.ietf.org/html/draft-ietf-teas-enhanced=
-vpn-05">https://tools.ietf.org/html/draft-ietf-teas-enhanced-vpn-05</a></=
div><br></div><div dir=3D"auto"><br></div><div dir=3D"auto">In reading bot=
h documents the basic concept at a high level is that you are trying to pr=
ovide a means of pinning overlay vpn service to underlay transport providi=
ng a form of isolation abstraction.</div><div dir=3D"auto"><br></div><div =
dir=3D"auto">From a Spring Source routing standpoint source routing provid=
ed by segment routing flavors SR-MPLS and SRv6 provides the same vpn color=
ing and source routed traffic engineering via SR-TE for SR-MPLS and SRv6 n=
ative L3 vpn coloring with SRH traffic steering. &nbsp;</div><div dir=3D"a=
uto"><br></div><div dir=3D"auto">So that coupling for IP SLA requirement o=
f underlay pinning to overlay vpn via traffic steering coloring via candid=
ate ERO paths to me seems to be satisfied by Segment Routing flavors.</div=
><div dir=3D"auto"><br></div><div dir=3D"auto">Am I missing something?</di=
v><div dir=3D"auto"><br></div><div dir=3D"auto">Kind regards&nbsp;</div><d=
iv dir=3D"auto"><br></div><div dir=3D"auto">Gyan</div><div dir=3D"auto"><b=
r></div><div dir=3D"auto"><div><a href=3D"https://tools.ietf.org/html/draf=
t-ietf-teas-enhanced-vpn-05">https://tools.ietf.org/html/draft-ietf-teas-e=
nhanced-vpn-05</a></div><br></div><div><br><div class=3D"gmail_quote"><div=
 dir=3D"ltr" class=3D"gmail_attr">On Sun, Mar 29, 2020 at 12:30 PM Tony Pr=
zygienda &lt;<a href=3D"mailto:tonysietf@gmail.com">tonysietf@gmail.com</a=
>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin: 0=
px 0px 0px 0.5em; border-left-width: 1px; border-left-color: rgb(204, 204,=
 204); border-left-style: solid; padding-left: 1ex;"><div dir=3D"ltr"><div=
>As usual +1 Les&nbsp; <br></div><div><br></div><div>Simply think what is =
the _L3 construct_ ISIS runs over which is easily identified as the same t=
hing that adjacency runs over. If adjacency runs over each constituent of =
L2 bundel we don't have L2, we have L3 with confused naming. If adjacency =
runs over the L2 bundle the bundle is an L3 construct and hence MTID appli=
es <br></div><div><br></div><div>again, to keep things orthogonal (mostly =
on the encoding side but also underlying architecture)&nbsp; I would deriv=
e 225 the same way we run 222. Otherwise we end up in funky places like "w=
hat happens if this bundle has more than one MTID and if it runs on no MT =
and a MTID" as well and what does it mean if it's missing and what if some=
one doesn't understand it and so on and so on. That stuff has been pretty =
well reviewed and thought out when it was done and all the tlv/subtlv disc=
ussions had then ...</div></div><div dir=3D"ltr"><div><br></div><div><br><=
/div><div>--- tony<br></div></div><br><div class=3D"gmail_quote"><div dir=
=3D"ltr" class=3D"gmail_attr">On Sun, Mar 29, 2020 at 8:57 AM Les Ginsberg=
 (ginsberg) &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">gi=
nsberg@cisco.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote"=
 style=3D"margin: 0px 0px 0px 0.5em; border-left-width: 1px; border-left-s=
tyle: solid; border-left-color: rgb(204, 204, 204); padding-left: 1ex;">Pe=
ter/Aijun -<br>=0A<br>=0AWe are in agreement.<br>=0AI never said that an L=
2 Bundle member could/should be associated with a specific MTID.<br>=0A<br=
>=0AIt is the L3 adjacency that has the MTID association.<br>=0AIf we were=
 going to support MTID in TLV 25 the correct place to put it would be as p=
art of the " Parent L3 Neighbor Descriptor".<br>=0A<br>=0A&nbsp; &nbsp;Les=
<br>=0A<br>=0A<br>=0A&gt; -----Original Message-----<br>=0A&gt; From: Lsr =
&lt;<a href=3D"mailto:lsr-bounces@ietf.org" target=3D"_blank">lsr-bounces@=
ietf.org</a>&gt; On Behalf Of Aijun Wang<br>=0A&gt; Sent: Sunday, March 29=
, 2020 3:46 AM<br>=0A&gt; To: Peter Psenak &lt;ppsenak=3D<a href=3D"mailto=
:40cisco.com@dmarc.ietf.org" target=3D"_blank">40cisco.com@dmarc.ietf.org<=
/a>&gt;<br>=0A&gt; Cc: <a href=3D"mailto:peng.shaofu@zte.com.cn" target=3D=
"_blank">peng.shaofu@zte.com.cn</a>; Dongjie (Jimmy) &lt;<a href=3D"mailto=
:jie.dong@huawei..com" target=3D"_blank">jie.dong@huawei.com</a>&gt;;<br>=
=0A&gt; <a href=3D"mailto:xiechf@chinatelecom.cn" target=3D"_blank">xiechf=
@chinatelecom.cn</a>; Les Ginsberg (ginsberg)<br>=0A&gt; &lt;ginsberg=3D<a=
 href=3D"mailto:40cisco.com@dmarc.ietf.org" target=3D"_blank">40cisco.com@=
dmarc.ietf.org</a>&gt;; <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">=
lsr@ietf.org</a>; Tony Przygienda<br>=0A&gt; &lt;<a href=3D"mailto:tonysie=
tf@gmail.com" target=3D"_blank">tonysietf@gmail.com</a>&gt;<br>=0A&gt; Sub=
ject: Re: [Lsr] Using IS-IS Multi-Topology (MT) for Segment Routing<br>=0A=
&gt; basedVirtual Transport Network<br>=0A&gt; <br>=0A&gt; I have the same=
 consideration as Peter.<br>=0A&gt; <br>=0A&gt; Aijun Wang<br>=0A&gt; Chin=
a Telecom<br>=0A&gt; <br>=0A&gt; &gt; On Mar 29, 2020, at 17:10, Peter Pse=
nak<br>=0A&gt; &lt;ppsenak=3D<a href=3D"mailto:40cisco.com@dmarc.ietf.org"=
 target=3D"_blank">40cisco.com@dmarc.ietf.org</a>&gt; wrote:<br>=0A&gt; &g=
t;<br>=0A&gt; &gt; =EF=BB=BFHi Les,<br>=0A&gt; &gt;<br>=0A&gt; &gt;&gt; On=
 29/03/2020 00:00, Les Ginsberg (ginsberg) wrote:<br>=0A&gt; &gt;&gt; Tony=
 =E2=80=93<br>=0A&gt; &gt;&gt; There are a few misunderstandings in your p=
ost.<br>=0A&gt; &gt;&gt; Let me try to correct them.<br>=0A&gt; &gt;&gt; R=
FC 8668 defines a new top-level TLV (25). This is NOT a sub-TLV(sic) of<br=
>=0A&gt; TLVs 22,23,141,222,223.<br>=0A&gt; &gt;&gt; Conceptually, it coul=
d have been defined as a sub-TLV, but because of the<br>=0A&gt; limited le=
ngth of a TLV in IS-IS (255 octets) and the likelihood that advertising<br=
>=0A&gt; L2Bundle member attributes would consume a significant amount of =
space,<br>=0A&gt; we decided to use a new top-level TLV which references t=
he associated L3<br>=0A&gt; adjacency advertised in TLV 22. This means TLV=
22 advertisements are not<br>=0A&gt; impacted by the presence of TLV 25. I=
n particular, the use of TLV 25 does not<br>=0A&gt; lead to multiple TLV 2=
2 advertisements for the same adjacency, which we<br>=0A&gt; thought was a=
 desirable outcome.<br>=0A&gt; &gt;&gt; The equivalent OSPF draft (<a href=
=3D"https://tools.ietf.org/html/draft-ketant-lsr-" rel=3D"noreferrer" targ=
et=3D"_blank">https://tools.ietf.org/html/draft-ketant-lsr-</a><br>=0A&gt;=
 ospf-l2bundles-01 ) takes the sub-TLV approach, but since OSPF has a 16 b=
it<br>=0A&gt; length for TLVs it does not face the same encoding issues.<b=
r>=0A&gt; &gt;&gt; I fully agree with you that an L2 bundle is a Layer 3 c=
onstruct =E2=80=93 and as such<br>=0A&gt; can be associated with any Layer=
 3 MTID in theory. However, when writing<br>=0A&gt; RFC 8668 we did not co=
nsider that there was a use case for topology specific<br>=0A&gt; link att=
ributes. The current encoding does not support MTID.<br>=0A&gt; &gt;<br>=
=0A&gt; &gt; RFC 8668 defines a TLV to advertise attributes of the individ=
ual L2 link<br>=0A&gt; members. While the TLV itself can be considered as =
L3 construct (and have<br>=0A&gt; MT associated with it), the individual L=
2 Bundle Member Links inside this TLV<br>=0A&gt; are not L3 constructs IMH=
O and should never have a MTID associated with<br>=0A&gt; them. The ask he=
re is to advertise different MTID for each individual L2<br>=0A&gt; bundle=
 member link.<br>=0A&gt; &gt;<br>=0A&gt; &gt; MTID is used to construct a =
topology. I do not see how a L2 bundle link<br>=0A&gt; member would ever b=
ecome part of the L3 topology.<br>=0A&gt; &gt;<br>=0A&gt; &gt; my 2c,<br>=
=0A&gt; &gt; Peter<br>=0A&gt; &gt;<br>=0A&gt; &gt;<br>=0A&gt; &gt;&gt; At =
this point, if we needed to extend RFC 8668 to support MTID we would<br>=
=0A&gt; need to allocate an additional TLV code point that included MTID =
=E2=80=93 similar to<br>=0A&gt; the distinction between TLV 22 and TLV 222=
.<br>=0A&gt; &gt;&gt; HTH<br>=0A&gt; &gt;&gt;&nbsp; &nbsp; Les<br>=0A&gt; =
&gt;&gt; *From:* Lsr &lt;<a href=3D"mailto:lsr-bounces@ietf.org" target=3D=
"_blank">lsr-bounces@ietf.org</a>&gt; *On Behalf Of * Tony Przygienda<br>=
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____________________<br>=0A&gt; Lsr mailing list<br>=0A&gt; <a href=3D"mai=
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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: wangyali <wangyali11@huawei.com>, "Acee Lindem (acee)" <acee@cisco.com>, Christian Hopps <chopps@chopps.org>
CC: "lsr@ietf.org" <lsr@ietf.org>, Tianran Zhou <zhoutianran@huawei.com>
Thread-Topic: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
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Subject: Re: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
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From: Robert Raszuk <robert@raszuk.net>
Date: Thu, 2 Apr 2020 11:17:52 +0200
Message-ID: <CAOj+MMGsVkws0sTw4RRdb_SdWvsuh+2Dxc-upXqT2_pmpO_+Lg@mail.gmail.com>
To: "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>
Cc: wangyali <wangyali11@huawei.com>, "Acee Lindem (acee)" <acee@cisco.com>,  Christian Hopps <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>, Tianran Zhou <zhoutianran@huawei.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/OtrPuvdLkM_sP1eTvoMeP1wBPR8>
Subject: Re: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
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Hi Les,

I would like to respectfully disagree with your assessment.

The fact that today's IGP (or for that matter BGP) routing is static from
the perspective of not taking into consideration real performance
measurements from the data plane to me is a bug not a feature.

Building SPT based on static link metrics which in vast majority of cases
today are emulated circuits on someone else IP backbone. It was a great
idea when you constructed the network with connection oriented paradigm
(Sonet,SDH, dark fiber, TDM ...) not connection less often best effort one.

So I find this proposal very useful and would vote for adopting it in LSR
WG. To me in-situ telemetry is not just some monitoring tool. It is an
extremely important element to influence how we compute reachability or at
least how we choose active forwarding paths from protocol RIBs to main RIB.

If we extended IGPs to carry TE information, if we extended them to enable
flexible algorithm based path computation I fail to understand why would we
resist to natively enable all of the above with getting the inputs from
real networks to be used as to the parameters to the above mentioned tools.

Kind regards,
R.

On Thu, Apr 2, 2020 at 8:32 AM Les Ginsberg (ginsberg) <ginsberg=3D
40cisco.com@dmarc.ietf.org> wrote:

> Yali -
>
> There is a very significant difference between having IGPs advertise an
> identifier for a service that they use as clients (BFD) and having IGPs
> advertise a set of capabilities/options for a telemetry application which
> has no direct bearing on the function of the routing protocol.
>
> You are not the first to find using IGPs to flood application information
> very convenient.  But this is not the appropriate role for the IGPs and
> over the years we have consistently resisted attempts to do so.
>
> Everything advertised in Router Capabilities today has some close
> relationship with the operation of the protocol. Do some of the existing
> advertisements "bend the rules" a bit more than I would prefer? Yes - but
> there has always been at least a close relationship to routing protocol
> function.
> Here there is none.
>
> If you feel compelled to use IGPs to advertise application information,
> you have RF6823 available (at least for IS-IS). But it is a "high bar"
> since it requires you also to use a separate IS-IS instance dedicated to
> advertising the application information (see RFC8202).
> I think Chris Hopps's suggestion to use Netconf/YANG to configure/retriev=
e
> what you need is most likely more attractive - but I will leave that for
> you to decide.
>
> Using IGP Router Capabilities here is wrong in my view.
>
>    Les
>
>
> > -----Original Message-----
> > From: wangyali <wangyali11@huawei.com>
> > Sent: Wednesday, April 01, 2020 8:12 PM
> > To: Acee Lindem (acee) <acee@cisco.com>; Les Ginsberg (ginsberg)
> > <ginsberg@cisco.com>; Christian Hopps <chopps@chopps.org>
> > Cc: lsr@ietf.org; Tianran Zhou <zhoutianran@huawei.com>
> > Subject: =E7=AD=94=E5=A4=8D: [Lsr] A new version of I-D,
> draft-liu-lsr-isis-ifit-node-capability-
> > 02
> >
> > Hi Acee, Chris and Les,
> >
> > This is Yali. Many thanks for your kind comments and suggestion.
> >
> > Besides of signaling MSD by IGP node CAPABILITY TLV, we learned that
> > there's another RFC7883 that advertising S-BFD discriminators in IS-IS.
> In my
> > understand, BFD is a protocol to detect faults in the bidirectional pat=
h
> > between two forwarding engines, including interface, data links, etc.
> >
> > Similarly, IFIT provides a complete framework of a family of on-path
> > telemetry techniques, which are used to monitoring performance metrics =
of
> > service flows, e.g. packet loss, delay. So we consider there's a same
> > methodology with S-BFD that advertising IFIT node capabilities.
> >
> > Please let us know your comments and opinion. Thanks.
> >
> > Best regards,
> > Yali
> >
> > -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
> > =E5=8F=91=E4=BB=B6=E4=BA=BA: Acee Lindem (acee) [mailto:acee@cisco.com]
> > =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B44=E6=9C=881=E6=97=A5=
 20:29
> > =E6=94=B6=E4=BB=B6=E4=BA=BA: Tianran Zhou <zhoutianran@huawei.com>; Les=
 Ginsberg (ginsberg)
> > <ginsberg@cisco.com>; Christian Hopps <chopps@chopps.org>
> > =E6=8A=84=E9=80=81: lsr@ietf.org; wangyali <wangyali11@huawei.com>
> > =E4=B8=BB=E9=A2=98: Re: [Lsr] A new version of I-D,
> draft-liu-lsr-isis-ifit-node-capability-02
> >
> > Speak as WG Member...
> >
> > =EF=BB=BFOn 4/1/20, 8:08 AM, "Acee Lindem (acee)" <acee@cisco.com> wrot=
e:
> >
> >     There is also a difference between some of the existing application=
s
> > advertised in IGP capabilities. For example, MSD is used with the routi=
ng
> > information to construct SR paths. The information for all these OAM
> > mechanisms doesn't share this affinity. Also, it seems like a slippery
> slope in
> > what is needed for each of the mechanism.
> >     Thanks,
> >     Acee
> >
> >     On 4/1/20, 4:01 AM, "Lsr on behalf of Tianran Zhou" <
> lsr-bounces@ietf.org
> > on behalf of zhoutianran@huawei.com> wrote:
> >
> >         Hi Les,
> >
> >         Thanks very much for your suggestion. I have a quick look at
> rfc6823.
> > Sounds like a good idea. I will think about it.
> >
> >         Cheers,
> >         Tianran
> >
> >         -----Original Message-----
> >         From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]
> >         Sent: Wednesday, April 1, 2020 1:47 PM
> >         To: Tianran Zhou <zhoutianran@huawei.com>; Christian Hopps
> > <chopps@chopps.org>
> >         Cc: wangyali <wangyali11@huawei.com>; lsr@ietf.org
> >         Subject: RE: [Lsr] A new version of I-D,
> draft-liu-lsr-isis-ifit-node-
> > capability-02
> >
> >         Tianran -
> >
> >         I am very much in agreement with the points Chris has made.
> >
> >         IGPs do not exist to advertise capabilities/configure
> applications - which
> > seems to me to be what you are proposing here.
> >         The fact that you can easily define the encodings does not make
> it the
> > right thing to do.
> >
> >         This issue was discussed at length in the context of
> > https://tools.ietf.org/html/rfc6823 . If you were proposing to use
> GENAPP I
> > would not object - though I do think Chris has correctly pointed out th=
at
> > NETCONF/YANG is likely a more appropriate solution for your use case.
> >
> >            Les
> >
> >
> >         > -----Original Message-----
> >         > From: Tianran Zhou <zhoutianran@huawei.com>
> >         > Sent: Tuesday, March 31, 2020 7:53 PM
> >         > To: Christian Hopps <chopps@chopps.org>
> >         > Cc: wangyali <wangyali11@huawei.com>; Les Ginsberg (ginsberg)
> >         > <ginsberg@cisco.com>; lsr@ietf.org
> >         > Subject: RE: [Lsr] A new version of I-D,
> >         > draft-liu-lsr-isis-ifit-node-capability-02
> >         >
> >         > Hi Chris,
> >         > Thanks for your quick reply, and please see inline.
> >         >
> >         > Cheers,
> >         > Tianran
> >         >
> >         > -----Original Message-----
> >         > From: Christian Hopps [mailto:chopps@chopps.org]
> >         > Sent: Wednesday, April 1, 2020 10:00 AM
> >         > To: Tianran Zhou <zhoutianran@huawei.com>
> >         > Cc: Christian Hopps <chopps@chopps.org>; wangyali
> >         > <wangyali11@huawei.com>; Les Ginsberg (ginsberg)
> > <ginsberg@cisco.com>;
> >         > lsr@ietf.org
> >         > Subject: Re: [Lsr] A new version of I-D,
> >         > draft-liu-lsr-isis-ifit-node-capability-02
> >         >
> >         >
> >         >
> >         > > On Mar 31, 2020, at 9:28 PM, Tianran Zhou
> > <zhoutianran@huawei.com>
> >         > wrote:
> >         > >
> >         > > ZTR> Let's not boil the ocean to compare NETCONF/YANG or
> routing
> >         > protocol, which is better. But I did not see the modification
> to
> >         > routing protocol with some TLVs is a heavy work, or more
> complex than
> >         > NETCONF/YANG.  I see both are available and useful.
> >         >
> >         > I'm not sure what you mean by boiling the ocean. I'm saying
> that YANG
> >         > is built and intended for querying capabilities and configuri=
ng
> >         > routers. Why isn't that where you are looking first for
> configuring your
> > monitoring application?
> >         >
> >         > ZTR> I know NETCONF can do both query and configuration. And =
I
> > know
> >         > resent YANG-Push improvements to reduce the polling.  But
> routing
> >         > protocol solutions are also widely used for this. There are
> already
> >         > many RFCs and implementation practices. We considered both
> ways,
> > and
> >         > aimed for different scenarios.
> >         >
> >         > You don't see the major difference between writing a YANG
> model vs
> >         > modifying all of the standard IETF routing protocols?
> >         >
> >         > ZTR> I know many differences between NETCONF and routing
> > protocol.
> >         > There are many details on both interfaces, implementations,
> scenarios
> >         > when comparing them. That's what I mean boil the ocean.
> >         > Here I do not know what's the "major difference" you mean?
> >         >
> >         > Thanks,
> >         > Chris.
> >
> >         _______________________________________________
> >         Lsr mailing list
> >         Lsr@ietf.org
> >         https://www.ietf.org/mailman/listinfo/lsr
> >
> >
> >
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>

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<div dir=3D"ltr">Hi Les,<div><br></div><div>I would like to respectfully di=
sagree with your assessment.=C2=A0</div><div><br></div><div>The fact that t=
oday&#39;s IGP (or for that matter BGP) routing is static from the perspect=
ive of not taking into consideration real performance measurements from the=
 data plane to me is a bug not a feature.=C2=A0</div><div><br></div><div>Bu=
ilding SPT based on static link metrics which in vast majority of cases tod=
ay are emulated circuits on someone else=C2=A0IP backbone. It was a great i=
dea when you constructed the network with connection oriented paradigm (Son=
et,SDH, dark fiber, TDM ...) not connection less often best effort one.=C2=
=A0</div><div><br></div><div>So I find this proposal very useful and would =
vote for adopting it in LSR WG. To me in-situ telemetry=C2=A0is not just so=
me monitoring tool. It is an extremely important element to influence how w=
e compute reachability or at least how we choose active forwarding paths fr=
om protocol RIBs to main RIB.=C2=A0</div><div><br></div><div>If we extended=
 IGPs to carry TE information, if we extended them to enable flexible=C2=A0=
algorithm based path computation I fail to understand why would we resist t=
o natively enable all of the above with getting the inputs from real networ=
ks to be used as to the parameters to the above mentioned tools.=C2=A0</div=
><div><br></div><div>Kind regards,</div><div>R.</div></div><br><div class=
=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, Apr 2, 2020 =
at 8:32 AM Les Ginsberg (ginsberg) &lt;ginsberg=3D<a href=3D"mailto:40cisco=
.com@dmarc.ietf.org">40cisco.com@dmarc.ietf.org</a>&gt; wrote:<br></div><bl=
ockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-lef=
t:1px solid rgb(204,204,204);padding-left:1ex">Yali -<br>
<br>
There is a very significant difference between having IGPs advertise an ide=
ntifier for a service that they use as clients (BFD) and having IGPs advert=
ise a set of capabilities/options for a telemetry application which has no =
direct bearing on the function of the routing protocol.<br>
<br>
You are not the first to find using IGPs to flood application information v=
ery convenient.=C2=A0 But this is not the appropriate role for the IGPs and=
 over the years we have consistently resisted attempts to do so.<br>
<br>
Everything advertised in Router Capabilities today has some close relations=
hip with the operation of the protocol. Do some of the existing advertiseme=
nts &quot;bend the rules&quot; a bit more than I would prefer? Yes - but th=
ere has always been at least a close relationship to routing protocol funct=
ion.<br>
Here there is none.<br>
<br>
If you feel compelled to use IGPs to advertise application information, you=
 have RF6823 available (at least for IS-IS). But it is a &quot;high bar&quo=
t; since it requires you also to use a separate IS-IS instance dedicated to=
 advertising the application information (see RFC8202).<br>
I think Chris Hopps&#39;s suggestion to use Netconf/YANG to configure/retri=
eve what you need is most likely more attractive - but I will leave that fo=
r you to decide.<br>
<br>
Using IGP Router Capabilities here is wrong in my view.<br>
<br>
=C2=A0 =C2=A0Les<br>
<br>
<br>
&gt; -----Original Message-----<br>
&gt; From: wangyali &lt;<a href=3D"mailto:wangyali11@huawei.com" target=3D"=
_blank">wangyali11@huawei.com</a>&gt;<br>
&gt; Sent: Wednesday, April 01, 2020 8:12 PM<br>
&gt; To: Acee Lindem (acee) &lt;<a href=3D"mailto:acee@cisco.com" target=3D=
"_blank">acee@cisco.com</a>&gt;; Les Ginsberg (ginsberg)<br>
&gt; &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">ginsberg@c=
isco.com</a>&gt;; Christian Hopps &lt;<a href=3D"mailto:chopps@chopps.org" =
target=3D"_blank">chopps@chopps.org</a>&gt;<br>
&gt; Cc: <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</a>=
; Tianran Zhou &lt;<a href=3D"mailto:zhoutianran@huawei.com" target=3D"_bla=
nk">zhoutianran@huawei.com</a>&gt;<br>
&gt; Subject: =E7=AD=94=E5=A4=8D: [Lsr] A new version of I-D, draft-liu-lsr=
-isis-ifit-node-capability-<br>
&gt; 02<br>
&gt; <br>
&gt; Hi Acee, Chris and Les,<br>
&gt; <br>
&gt; This is Yali. Many thanks for your kind comments and suggestion.<br>
&gt; <br>
&gt; Besides of signaling MSD by IGP node CAPABILITY TLV, we learned that<b=
r>
&gt; there&#39;s another RFC7883 that advertising S-BFD discriminators in I=
S-IS. In my<br>
&gt; understand, BFD is a protocol to detect faults in the bidirectional pa=
th<br>
&gt; between two forwarding engines, including interface, data links, etc.<=
br>
&gt; <br>
&gt; Similarly, IFIT provides a complete framework of a family of on-path<b=
r>
&gt; telemetry techniques, which are used to monitoring performance metrics=
 of<br>
&gt; service flows, e.g. packet loss, delay. So we consider there&#39;s a s=
ame<br>
&gt; methodology with S-BFD that advertising IFIT node capabilities.<br>
&gt; <br>
&gt; Please let us know your comments and opinion. Thanks.<br>
&gt; <br>
&gt; Best regards,<br>
&gt; Yali<br>
&gt; <br>
&gt; -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----<br>
&gt; =E5=8F=91=E4=BB=B6=E4=BA=BA: Acee Lindem (acee) [mailto:<a href=3D"mai=
lto:acee@cisco.com" target=3D"_blank">acee@cisco.com</a>]<br>
&gt; =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B44=E6=9C=881=E6=97=
=A5 20:29<br>
&gt; =E6=94=B6=E4=BB=B6=E4=BA=BA: Tianran Zhou &lt;<a href=3D"mailto:zhouti=
anran@huawei.com" target=3D"_blank">zhoutianran@huawei.com</a>&gt;; Les Gin=
sberg (ginsberg)<br>
&gt; &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">ginsberg@c=
isco.com</a>&gt;; Christian Hopps &lt;<a href=3D"mailto:chopps@chopps.org" =
target=3D"_blank">chopps@chopps.org</a>&gt;<br>
&gt; =E6=8A=84=E9=80=81: <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">=
lsr@ietf.org</a>; wangyali &lt;<a href=3D"mailto:wangyali11@huawei.com" tar=
get=3D"_blank">wangyali11@huawei.com</a>&gt;<br>
&gt; =E4=B8=BB=E9=A2=98: Re: [Lsr] A new version of I-D, draft-liu-lsr-isis=
-ifit-node-capability-02<br>
&gt; <br>
&gt; Speak as WG Member...<br>
&gt; <br>
&gt; =EF=BB=BFOn 4/1/20, 8:08 AM, &quot;Acee Lindem (acee)&quot; &lt;<a hre=
f=3D"mailto:acee@cisco.com" target=3D"_blank">acee@cisco.com</a>&gt; wrote:=
<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0There is also a difference between some of the exis=
ting applications<br>
&gt; advertised in IGP capabilities. For example, MSD is used with the rout=
ing<br>
&gt; information to construct SR paths. The information for all these OAM<b=
r>
&gt; mechanisms doesn&#39;t share this affinity. Also, it seems like a slip=
pery slope in<br>
&gt; what is needed for each of the mechanism.<br>
&gt;=C2=A0 =C2=A0 =C2=A0Thanks,<br>
&gt;=C2=A0 =C2=A0 =C2=A0Acee<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0On 4/1/20, 4:01 AM, &quot;Lsr on behalf of Tianran =
Zhou&quot; &lt;<a href=3D"mailto:lsr-bounces@ietf.org" target=3D"_blank">ls=
r-bounces@ietf.org</a><br>
&gt; on behalf of <a href=3D"mailto:zhoutianran@huawei.com" target=3D"_blan=
k">zhoutianran@huawei.com</a>&gt; wrote:<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hi Les,<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Thanks very much for your suggestion.=
 I have a quick look at rfc6823.<br>
&gt; Sounds like a good idea. I will think about it.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Cheers,<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Tianran<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0-----Original Message-----<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0From: Les Ginsberg (ginsberg) [mailto=
:<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">ginsberg@cisco.com=
</a>]<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Sent: Wednesday, April 1, 2020 1:47 P=
M<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0To: Tianran Zhou &lt;<a href=3D"mailt=
o:zhoutianran@huawei.com" target=3D"_blank">zhoutianran@huawei.com</a>&gt;;=
 Christian Hopps<br>
&gt; &lt;<a href=3D"mailto:chopps@chopps.org" target=3D"_blank">chopps@chop=
ps.org</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Cc: wangyali &lt;<a href=3D"mailto:wa=
ngyali11@huawei.com" target=3D"_blank">wangyali11@huawei.com</a>&gt;; <a hr=
ef=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Subject: RE: [Lsr] A new version of I=
-D, draft-liu-lsr-isis-ifit-node-<br>
&gt; capability-02<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Tianran -<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0I am very much in agreement with the =
points Chris has made.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0IGPs do not exist to advertise capabi=
lities/configure applications - which<br>
&gt; seems to me to be what you are proposing here.<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0The fact that you can easily define t=
he encodings does not make it the<br>
&gt; right thing to do.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0This issue was discussed at length in=
 the context of<br>
&gt; <a href=3D"https://tools.ietf.org/html/rfc6823" rel=3D"noreferrer" tar=
get=3D"_blank">https://tools.ietf.org/html/rfc6823</a> . If you were propos=
ing to use GENAPP I<br>
&gt; would not object - though I do think Chris has correctly pointed out t=
hat<br>
&gt; NETCONF/YANG is likely a more appropriate solution for your use case.<=
br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Les<br>
&gt; <br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; -----Original Message-----<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; From: Tianran Zhou &lt;<a href=
=3D"mailto:zhoutianran@huawei.com" target=3D"_blank">zhoutianran@huawei.com=
</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Sent: Tuesday, March 31, 2020 7:=
53 PM<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; To: Christian Hopps &lt;<a href=
=3D"mailto:chopps@chopps.org" target=3D"_blank">chopps@chopps.org</a>&gt;<b=
r>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Cc: wangyali &lt;<a href=3D"mail=
to:wangyali11@huawei.com" target=3D"_blank">wangyali11@huawei.com</a>&gt;; =
Les Ginsberg (ginsberg)<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; &lt;<a href=3D"mailto:ginsberg@c=
isco.com" target=3D"_blank">ginsberg@cisco.com</a>&gt;; <a href=3D"mailto:l=
sr@ietf.org" target=3D"_blank">lsr@ietf.org</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Subject: RE: [Lsr] A new version=
 of I-D,<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; draft-liu-lsr-isis-ifit-node-cap=
ability-02<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Hi Chris,<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Thanks for your quick reply, and=
 please see inline.<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Cheers,<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Tianran<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; -----Original Message-----<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; From: Christian Hopps [mailto:<a=
 href=3D"mailto:chopps@chopps.org" target=3D"_blank">chopps@chopps.org</a>]=
<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Sent: Wednesday, April 1, 2020 1=
0:00 AM<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; To: Tianran Zhou &lt;<a href=3D"=
mailto:zhoutianran@huawei.com" target=3D"_blank">zhoutianran@huawei.com</a>=
&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Cc: Christian Hopps &lt;<a href=
=3D"mailto:chopps@chopps.org" target=3D"_blank">chopps@chopps.org</a>&gt;; =
wangyali<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; &lt;<a href=3D"mailto:wangyali11=
@huawei.com" target=3D"_blank">wangyali11@huawei.com</a>&gt;; Les Ginsberg =
(ginsberg)<br>
&gt; &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">ginsberg@c=
isco.com</a>&gt;;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; <a href=3D"mailto:lsr@ietf.org" =
target=3D"_blank">lsr@ietf.org</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Subject: Re: [Lsr] A new version=
 of I-D,<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; draft-liu-lsr-isis-ifit-node-cap=
ability-02<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; &gt; On Mar 31, 2020, at 9:28 PM=
, Tianran Zhou<br>
&gt; &lt;<a href=3D"mailto:zhoutianran@huawei.com" target=3D"_blank">zhouti=
anran@huawei.com</a>&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; wrote:<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; &gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; &gt; ZTR&gt; Let&#39;s not boil =
the ocean to compare NETCONF/YANG or routing<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; protocol, which is better. But I=
 did not see the modification to<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; routing protocol with some TLVs =
is a heavy work, or more complex than<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; NETCONF/YANG.=C2=A0 I see both a=
re available and useful.<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; I&#39;m not sure what you mean b=
y boiling the ocean. I&#39;m saying that YANG<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; is built and intended for queryi=
ng capabilities and configuring<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; routers. Why isn&#39;t that wher=
e you are looking first for configuring your<br>
&gt; monitoring application?<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; ZTR&gt; I know NETCONF can do bo=
th query and configuration. And I<br>
&gt; know<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; resent YANG-Push improvements to=
 reduce the polling.=C2=A0 But routing<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; protocol solutions are also wide=
ly used for this. There are already<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; many RFCs and implementation pra=
ctices. We considered both ways,<br>
&gt; and<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; aimed for different scenarios.<b=
r>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; You don&#39;t see the major diff=
erence between writing a YANG model vs<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; modifying all of the standard IE=
TF routing protocols?<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; ZTR&gt; I know many differences =
between NETCONF and routing<br>
&gt; protocol.<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; There are many details on both i=
nterfaces, implementations, scenarios<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; when comparing them. That&#39;s =
what I mean boil the ocean.<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Here I do not know what&#39;s th=
e &quot;major difference&quot; you mean?<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Thanks,<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Chris.<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0_____________________________________=
__________<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Lsr mailing list<br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"mailto:Lsr@ietf.org" targe=
t=3D"_blank">Lsr@ietf.org</a><br>
&gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://www.ietf.org/mailm=
an/listinfo/lsr" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org/=
mailman/listinfo/lsr</a><br>
&gt; <br>
&gt; <br>
&gt; <br>
<br>
_______________________________________________<br>
Lsr mailing list<br>
<a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
</blockquote></div>

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Cc: Christian Hopps <chopps@chopps.org>, "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>, wangyali <wangyali11@huawei.com>, "Acee Lindem (acee)" <acee@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>, Tianran Zhou <zhoutianran@huawei.com>
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Subject: Re: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
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We have defined a perfectly acceptable and quite powerful way to do =
query and configuration for routers, it's YANG. I'd like to hear why the =
the IETF standard mechanism for query and configuration can't work for =
this application.

Telemetry is important, I don't think anyone has said or would say that =
it isn't, but that seems orthogonal to this discussion.

Thanks,
Chris.
[as WG member]


> On Apr 2, 2020, at 5:17 AM, Robert Raszuk <robert@raszuk.net> wrote:
>=20
> Hi Les,
>=20
> I would like to respectfully disagree with your assessment.=20
>=20
> The fact that today's IGP (or for that matter BGP) routing is static =
from the perspective of not taking into consideration real performance =
measurements from the data plane to me is a bug not a feature.=20
>=20
> Building SPT based on static link metrics which in vast majority of =
cases today are emulated circuits on someone else IP backbone. It was a =
great idea when you constructed the network with connection oriented =
paradigm (Sonet,SDH, dark fiber, TDM ...) not connection less often best =
effort one.=20
>=20
> So I find this proposal very useful and would vote for adopting it in =
LSR WG. To me in-situ telemetry is not just some monitoring tool. It is =
an extremely important element to influence how we compute reachability =
or at least how we choose active forwarding paths from protocol RIBs to =
main RIB.=20
>=20
> If we extended IGPs to carry TE information, if we extended them to =
enable flexible algorithm based path computation I fail to understand =
why would we resist to natively enable all of the above with getting the =
inputs from real networks to be used as to the parameters to the above =
mentioned tools.=20
>=20
> Kind regards,
> R.
>=20
> On Thu, Apr 2, 2020 at 8:32 AM Les Ginsberg (ginsberg) =
<ginsberg=3D40cisco.com@dmarc.ietf.org> wrote:
> Yali -
>=20
> There is a very significant difference between having IGPs advertise =
an identifier for a service that they use as clients (BFD) and having =
IGPs advertise a set of capabilities/options for a telemetry application =
which has no direct bearing on the function of the routing protocol.
>=20
> You are not the first to find using IGPs to flood application =
information very convenient.  But this is not the appropriate role for =
the IGPs and over the years we have consistently resisted attempts to do =
so.
>=20
> Everything advertised in Router Capabilities today has some close =
relationship with the operation of the protocol. Do some of the existing =
advertisements "bend the rules" a bit more than I would prefer? Yes - =
but there has always been at least a close relationship to routing =
protocol function.
> Here there is none.
>=20
> If you feel compelled to use IGPs to advertise application =
information, you have RF6823 available (at least for IS-IS). But it is a =
"high bar" since it requires you also to use a separate IS-IS instance =
dedicated to advertising the application information (see RFC8202).
> I think Chris Hopps's suggestion to use Netconf/YANG to =
configure/retrieve what you need is most likely more attractive - but I =
will leave that for you to decide.
>=20
> Using IGP Router Capabilities here is wrong in my view.
>=20
>    Les
>=20
>=20
> > -----Original Message-----
> > From: wangyali <wangyali11@huawei.com>
> > Sent: Wednesday, April 01, 2020 8:12 PM
> > To: Acee Lindem (acee) <acee@cisco.com>; Les Ginsberg (ginsberg)
> > <ginsberg@cisco.com>; Christian Hopps <chopps@chopps.org>
> > Cc: lsr@ietf.org; Tianran Zhou <zhoutianran@huawei.com>
> > Subject: =E7=AD=94=E5=A4=8D: [Lsr] A new version of I-D, =
draft-liu-lsr-isis-ifit-node-capability-
> > 02
> >=20
> > Hi Acee, Chris and Les,
> >=20
> > This is Yali. Many thanks for your kind comments and suggestion.
> >=20
> > Besides of signaling MSD by IGP node CAPABILITY TLV, we learned that
> > there's another RFC7883 that advertising S-BFD discriminators in =
IS-IS. In my
> > understand, BFD is a protocol to detect faults in the bidirectional =
path
> > between two forwarding engines, including interface, data links, =
etc.
> >=20
> > Similarly, IFIT provides a complete framework of a family of on-path
> > telemetry techniques, which are used to monitoring performance =
metrics of
> > service flows, e.g. packet loss, delay. So we consider there's a =
same
> > methodology with S-BFD that advertising IFIT node capabilities.
> >=20
> > Please let us know your comments and opinion. Thanks.
> >=20
> > Best regards,
> > Yali
> >=20
> > -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
> > =E5=8F=91=E4=BB=B6=E4=BA=BA: Acee Lindem (acee) =
[mailto:acee@cisco.com]
> > =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B44=E6=9C=881=E6=97=A5=
 20:29
> > =E6=94=B6=E4=BB=B6=E4=BA=BA: Tianran Zhou <zhoutianran@huawei.com>; =
Les Ginsberg (ginsberg)
> > <ginsberg@cisco.com>; Christian Hopps <chopps@chopps.org>
> > =E6=8A=84=E9=80=81: lsr@ietf.org; wangyali <wangyali11@huawei.com>
> > =E4=B8=BB=E9=A2=98: Re: [Lsr] A new version of I-D, =
draft-liu-lsr-isis-ifit-node-capability-02
> >=20
> > Speak as WG Member...
> >=20
> > =EF=BB=BFOn 4/1/20, 8:08 AM, "Acee Lindem (acee)" <acee@cisco.com> =
wrote:
> >=20
> >     There is also a difference between some of the existing =
applications
> > advertised in IGP capabilities. For example, MSD is used with the =
routing
> > information to construct SR paths. The information for all these OAM
> > mechanisms doesn't share this affinity. Also, it seems like a =
slippery slope in
> > what is needed for each of the mechanism.
> >     Thanks,
> >     Acee
> >=20
> >     On 4/1/20, 4:01 AM, "Lsr on behalf of Tianran Zhou" =
<lsr-bounces@ietf.org
> > on behalf of zhoutianran@huawei.com> wrote:
> >=20
> >         Hi Les,
> >=20
> >         Thanks very much for your suggestion. I have a quick look at =
rfc6823.
> > Sounds like a good idea. I will think about it.
> >=20
> >         Cheers,
> >         Tianran
> >=20
> >         -----Original Message-----
> >         From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]
> >         Sent: Wednesday, April 1, 2020 1:47 PM
> >         To: Tianran Zhou <zhoutianran@huawei.com>; Christian Hopps
> > <chopps@chopps.org>
> >         Cc: wangyali <wangyali11@huawei.com>; lsr@ietf.org
> >         Subject: RE: [Lsr] A new version of I-D, =
draft-liu-lsr-isis-ifit-node-
> > capability-02
> >=20
> >         Tianran -
> >=20
> >         I am very much in agreement with the points Chris has made.
> >=20
> >         IGPs do not exist to advertise capabilities/configure =
applications - which
> > seems to me to be what you are proposing here.
> >         The fact that you can easily define the encodings does not =
make it the
> > right thing to do.
> >=20
> >         This issue was discussed at length in the context of
> > https://tools.ietf.org/html/rfc6823 . If you were proposing to use =
GENAPP I
> > would not object - though I do think Chris has correctly pointed out =
that
> > NETCONF/YANG is likely a more appropriate solution for your use =
case.
> >=20
> >            Les
> >=20
> >=20
> >         > -----Original Message-----
> >         > From: Tianran Zhou <zhoutianran@huawei.com>
> >         > Sent: Tuesday, March 31, 2020 7:53 PM
> >         > To: Christian Hopps <chopps@chopps.org>
> >         > Cc: wangyali <wangyali11@huawei.com>; Les Ginsberg =
(ginsberg)
> >         > <ginsberg@cisco.com>; lsr@ietf.org
> >         > Subject: RE: [Lsr] A new version of I-D,
> >         > draft-liu-lsr-isis-ifit-node-capability-02
> >         >
> >         > Hi Chris,
> >         > Thanks for your quick reply, and please see inline.
> >         >
> >         > Cheers,
> >         > Tianran
> >         >
> >         > -----Original Message-----
> >         > From: Christian Hopps [mailto:chopps@chopps.org]
> >         > Sent: Wednesday, April 1, 2020 10:00 AM
> >         > To: Tianran Zhou <zhoutianran@huawei.com>
> >         > Cc: Christian Hopps <chopps@chopps.org>; wangyali
> >         > <wangyali11@huawei.com>; Les Ginsberg (ginsberg)
> > <ginsberg@cisco.com>;
> >         > lsr@ietf.org
> >         > Subject: Re: [Lsr] A new version of I-D,
> >         > draft-liu-lsr-isis-ifit-node-capability-02
> >         >
> >         >
> >         >
> >         > > On Mar 31, 2020, at 9:28 PM, Tianran Zhou
> > <zhoutianran@huawei.com>
> >         > wrote:
> >         > >
> >         > > ZTR> Let's not boil the ocean to compare NETCONF/YANG or =
routing
> >         > protocol, which is better. But I did not see the =
modification to
> >         > routing protocol with some TLVs is a heavy work, or more =
complex than
> >         > NETCONF/YANG.  I see both are available and useful.
> >         >
> >         > I'm not sure what you mean by boiling the ocean. I'm =
saying that YANG
> >         > is built and intended for querying capabilities and =
configuring
> >         > routers. Why isn't that where you are looking first for =
configuring your
> > monitoring application?
> >         >
> >         > ZTR> I know NETCONF can do both query and configuration. =
And I
> > know
> >         > resent YANG-Push improvements to reduce the polling.  But =
routing
> >         > protocol solutions are also widely used for this. There =
are already
> >         > many RFCs and implementation practices. We considered both =
ways,
> > and
> >         > aimed for different scenarios.
> >         >
> >         > You don't see the major difference between writing a YANG =
model vs
> >         > modifying all of the standard IETF routing protocols?
> >         >
> >         > ZTR> I know many differences between NETCONF and routing
> > protocol.
> >         > There are many details on both interfaces, =
implementations, scenarios
> >         > when comparing them. That's what I mean boil the ocean.
> >         > Here I do not know what's the "major difference" you mean?
> >         >
> >         > Thanks,
> >         > Chris.
> >=20
> >         _______________________________________________
> >         Lsr mailing list
> >         Lsr@ietf.org
> >         https://www.ietf.org/mailman/listinfo/lsr
> >=20
> >=20
> >=20
>=20
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr


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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Christian Hopps <chopps@chopps.org>, Robert Raszuk <robert@raszuk.net>
CC: wangyali <wangyali11@huawei.com>, "Acee Lindem (acee)" <acee@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>, Tianran Zhou <zhoutianran@huawei.com>
Thread-Topic: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
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Subject: Re: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
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From: Robert Raszuk <robert@raszuk.net>
Date: Thu, 2 Apr 2020 09:11:03 -0400
Message-ID: <CAOj+MMHoTbDzZrA1ttPsdD5Tk7TADaR=ex5WGF=6+X3X1utoHg@mail.gmail.com>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
Cc: Christian Hopps <chopps@chopps.org>, wangyali <wangyali11@huawei.com>,  "Acee Lindem (acee)" <acee@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>, Tianran Zhou <zhoutianran@huawei.com>
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Subject: Re: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
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Hi Les,

Ok very well.

So till this draft provides a text or reference to some other document how
IGPs may use inband telemetry data for real path selection it does not fit
to LSR charter. Fair.

Hi Chris,

I am afraid we are looking at this from completely different perspectives.

I consider this data to be a necessity for routing and you simply treat it
as some opaque telemetry. If we would think of it in the latter sense sure
you would be right. IGP is not a configuration push protocol. Sufficient to
observe how BGP became one :)

Many thx,
R.


On Thu, Apr 2, 2020 at 8:46 AM Les Ginsberg (ginsberg) <ginsberg@cisco.com>
wrote:

> Robert -
>
> First, +1 to what Chris has said.
>
> There is nothing in the lfit-capability draft that defines any informatio=
n
> that can be used by IGPs to do what you suggest.
> Perhaps it is possible that information gleaned via a telemetry
> application could be used by the IGPs to do something like what you sugge=
st
> - but this draft is not discussing/defining that. It is simply proposing =
to
> advertise information about the capabilities of the lfit application on a
> given node.
>
>    Les
>
> > -----Original Message-----
> > From: Christian Hopps <chopps@chopps.org>
> > Sent: Thursday, April 02, 2020 5:13 AM
> > To: Robert Raszuk <robert@raszuk.net>
> > Cc: Christian Hopps <chopps@chopps.org>; Les Ginsberg (ginsberg)
> > <ginsberg@cisco.com>; wangyali <wangyali11@huawei.com>; Acee Lindem
> > (acee) <acee@cisco.com>; lsr@ietf.org; Tianran Zhou
> > <zhoutianran@huawei.com>
> > Subject: Re: [Lsr] A new version of I-D,
> draft-liu-lsr-isis-ifit-node-capability-02
> >
> > We have defined a perfectly acceptable and quite powerful way to do que=
ry
> > and configuration for routers, it's YANG. I'd like to hear why the the
> IETF
> > standard mechanism for query and configuration can't work for this
> > application.
> >
> > Telemetry is important, I don't think anyone has said or would say that
> it isn't,
> > but that seems orthogonal to this discussion.
> >
> > Thanks,
> > Chris.
> > [as WG member]
> >
> >
> > > On Apr 2, 2020, at 5:17 AM, Robert Raszuk <robert@raszuk.net> wrote:
> > >
> > > Hi Les,
> > >
> > > I would like to respectfully disagree with your assessment.
> > >
> > > The fact that today's IGP (or for that matter BGP) routing is static
> from the
> > perspective of not taking into consideration real performance
> measurements
> > from the data plane to me is a bug not a feature.
> > >
> > > Building SPT based on static link metrics which in vast majority of
> cases
> > today are emulated circuits on someone else IP backbone. It was a great
> idea
> > when you constructed the network with connection oriented paradigm
> > (Sonet,SDH, dark fiber, TDM ...) not connection less often best effort
> one.
> > >
> > > So I find this proposal very useful and would vote for adopting it in
> LSR WG.
> > To me in-situ telemetry is not just some monitoring tool. It is an
> extremely
> > important element to influence how we compute reachability or at least
> how
> > we choose active forwarding paths from protocol RIBs to main RIB.
> > >
> > > If we extended IGPs to carry TE information, if we extended them to
> > enable flexible algorithm based path computation I fail to understand w=
hy
> > would we resist to natively enable all of the above with getting the
> inputs
> > from real networks to be used as to the parameters to the above mention=
ed
> > tools.
> > >
> > > Kind regards,
> > > R.
> > >
> > > On Thu, Apr 2, 2020 at 8:32 AM Les Ginsberg (ginsberg)
> > <ginsberg=3D40cisco.com@dmarc.ietf.org> wrote:
> > > Yali -
> > >
> > > There is a very significant difference between having IGPs advertise =
an
> > identifier for a service that they use as clients (BFD) and having IGPs
> > advertise a set of capabilities/options for a telemetry application
> which has
> > no direct bearing on the function of the routing protocol.
> > >
> > > You are not the first to find using IGPs to flood application
> information very
> > convenient.  But this is not the appropriate role for the IGPs and over
> the
> > years we have consistently resisted attempts to do so.
> > >
> > > Everything advertised in Router Capabilities today has some close
> > relationship with the operation of the protocol. Do some of the existin=
g
> > advertisements "bend the rules" a bit more than I would prefer? Yes - b=
ut
> > there has always been at least a close relationship to routing protocol
> > function.
> > > Here there is none.
> > >
> > > If you feel compelled to use IGPs to advertise application
> information, you
> > have RF6823 available (at least for IS-IS). But it is a "high bar" sinc=
e
> it requires
> > you also to use a separate IS-IS instance dedicated to advertising the
> > application information (see RFC8202).
> > > I think Chris Hopps's suggestion to use Netconf/YANG to
> configure/retrieve
> > what you need is most likely more attractive - but I will leave that fo=
r
> you to
> > decide.
> > >
> > > Using IGP Router Capabilities here is wrong in my view.
> > >
> > >    Les
> > >
> > >
> > > > -----Original Message-----
> > > > From: wangyali <wangyali11@huawei.com>
> > > > Sent: Wednesday, April 01, 2020 8:12 PM
> > > > To: Acee Lindem (acee) <acee@cisco.com>; Les Ginsberg (ginsberg)
> > > > <ginsberg@cisco.com>; Christian Hopps <chopps@chopps.org>
> > > > Cc: lsr@ietf.org; Tianran Zhou <zhoutianran@huawei.com>
> > > > Subject: =E7=AD=94=E5=A4=8D: [Lsr] A new version of I-D,
> draft-liu-lsr-isis-ifit-node-
> > capability-
> > > > 02
> > > >
> > > > Hi Acee, Chris and Les,
> > > >
> > > > This is Yali. Many thanks for your kind comments and suggestion.
> > > >
> > > > Besides of signaling MSD by IGP node CAPABILITY TLV, we learned tha=
t
> > > > there's another RFC7883 that advertising S-BFD discriminators in
> IS-IS. In
> > my
> > > > understand, BFD is a protocol to detect faults in the bidirectional
> path
> > > > between two forwarding engines, including interface, data links, et=
c.
> > > >
> > > > Similarly, IFIT provides a complete framework of a family of on-pat=
h
> > > > telemetry techniques, which are used to monitoring performance
> metrics
> > of
> > > > service flows, e.g. packet loss, delay. So we consider there's a sa=
me
> > > > methodology with S-BFD that advertising IFIT node capabilities.
> > > >
> > > > Please let us know your comments and opinion. Thanks.
> > > >
> > > > Best regards,
> > > > Yali
> > > >
> > > > -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
> > > > =E5=8F=91=E4=BB=B6=E4=BA=BA: Acee Lindem (acee) [mailto:acee@cisco.=
com]
> > > > =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B44=E6=9C=881=E6=
=97=A5 20:29
> > > > =E6=94=B6=E4=BB=B6=E4=BA=BA: Tianran Zhou <zhoutianran@huawei.com>;=
 Les Ginsberg
> > (ginsberg)
> > > > <ginsberg@cisco.com>; Christian Hopps <chopps@chopps.org>
> > > > =E6=8A=84=E9=80=81: lsr@ietf.org; wangyali <wangyali11@huawei.com>
> > > > =E4=B8=BB=E9=A2=98: Re: [Lsr] A new version of I-D,
> draft-liu-lsr-isis-ifit-node-capability-
> > 02
> > > >
> > > > Speak as WG Member...
> > > >
> > > > =EF=BB=BFOn 4/1/20, 8:08 AM, "Acee Lindem (acee)" <acee@cisco.com> =
wrote:
> > > >
> > > >     There is also a difference between some of the existing
> applications
> > > > advertised in IGP capabilities. For example, MSD is used with the
> routing
> > > > information to construct SR paths. The information for all these OA=
M
> > > > mechanisms doesn't share this affinity. Also, it seems like a
> slippery slope
> > in
> > > > what is needed for each of the mechanism.
> > > >     Thanks,
> > > >     Acee
> > > >
> > > >     On 4/1/20, 4:01 AM, "Lsr on behalf of Tianran Zhou" <lsr-
> > bounces@ietf.org
> > > > on behalf of zhoutianran@huawei.com> wrote:
> > > >
> > > >         Hi Les,
> > > >
> > > >         Thanks very much for your suggestion. I have a quick look a=
t
> rfc6823.
> > > > Sounds like a good idea. I will think about it.
> > > >
> > > >         Cheers,
> > > >         Tianran
> > > >
> > > >         -----Original Message-----
> > > >         From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]
> > > >         Sent: Wednesday, April 1, 2020 1:47 PM
> > > >         To: Tianran Zhou <zhoutianran@huawei.com>; Christian Hopps
> > > > <chopps@chopps.org>
> > > >         Cc: wangyali <wangyali11@huawei.com>; lsr@ietf.org
> > > >         Subject: RE: [Lsr] A new version of I-D,
> draft-liu-lsr-isis-ifit-node-
> > > > capability-02
> > > >
> > > >         Tianran -
> > > >
> > > >         I am very much in agreement with the points Chris has made.
> > > >
> > > >         IGPs do not exist to advertise capabilities/configure
> applications -
> > which
> > > > seems to me to be what you are proposing here.
> > > >         The fact that you can easily define the encodings does not
> make it
> > the
> > > > right thing to do.
> > > >
> > > >         This issue was discussed at length in the context of
> > > > https://tools.ietf.org/html/rfc6823 . If you were proposing to use
> > GENAPP I
> > > > would not object - though I do think Chris has correctly pointed ou=
t
> that
> > > > NETCONF/YANG is likely a more appropriate solution for your use cas=
e.
> > > >
> > > >            Les
> > > >
> > > >
> > > >         > -----Original Message-----
> > > >         > From: Tianran Zhou <zhoutianran@huawei.com>
> > > >         > Sent: Tuesday, March 31, 2020 7:53 PM
> > > >         > To: Christian Hopps <chopps@chopps.org>
> > > >         > Cc: wangyali <wangyali11@huawei.com>; Les Ginsberg
> (ginsberg)
> > > >         > <ginsberg@cisco.com>; lsr@ietf.org
> > > >         > Subject: RE: [Lsr] A new version of I-D,
> > > >         > draft-liu-lsr-isis-ifit-node-capability-02
> > > >         >
> > > >         > Hi Chris,
> > > >         > Thanks for your quick reply, and please see inline.
> > > >         >
> > > >         > Cheers,
> > > >         > Tianran
> > > >         >
> > > >         > -----Original Message-----
> > > >         > From: Christian Hopps [mailto:chopps@chopps.org]
> > > >         > Sent: Wednesday, April 1, 2020 10:00 AM
> > > >         > To: Tianran Zhou <zhoutianran@huawei.com>
> > > >         > Cc: Christian Hopps <chopps@chopps.org>; wangyali
> > > >         > <wangyali11@huawei.com>; Les Ginsberg (ginsberg)
> > > > <ginsberg@cisco.com>;
> > > >         > lsr@ietf.org
> > > >         > Subject: Re: [Lsr] A new version of I-D,
> > > >         > draft-liu-lsr-isis-ifit-node-capability-02
> > > >         >
> > > >         >
> > > >         >
> > > >         > > On Mar 31, 2020, at 9:28 PM, Tianran Zhou
> > > > <zhoutianran@huawei.com>
> > > >         > wrote:
> > > >         > >
> > > >         > > ZTR> Let's not boil the ocean to compare NETCONF/YANG o=
r
> > routing
> > > >         > protocol, which is better. But I did not see the
> modification to
> > > >         > routing protocol with some TLVs is a heavy work, or more
> complex
> > than
> > > >         > NETCONF/YANG.  I see both are available and useful.
> > > >         >
> > > >         > I'm not sure what you mean by boiling the ocean. I'm
> saying that
> > YANG
> > > >         > is built and intended for querying capabilities and
> configuring
> > > >         > routers. Why isn't that where you are looking first for
> configuring
> > your
> > > > monitoring application?
> > > >         >
> > > >         > ZTR> I know NETCONF can do both query and configuration.
> And I
> > > > know
> > > >         > resent YANG-Push improvements to reduce the polling.  But
> > routing
> > > >         > protocol solutions are also widely used for this. There
> are already
> > > >         > many RFCs and implementation practices. We considered bot=
h
> > ways,
> > > > and
> > > >         > aimed for different scenarios.
> > > >         >
> > > >         > You don't see the major difference between writing a YANG
> model
> > vs
> > > >         > modifying all of the standard IETF routing protocols?
> > > >         >
> > > >         > ZTR> I know many differences between NETCONF and routing
> > > > protocol.
> > > >         > There are many details on both interfaces, implementation=
s,
> > scenarios
> > > >         > when comparing them. That's what I mean boil the ocean.
> > > >         > Here I do not know what's the "major difference" you mean=
?
> > > >         >
> > > >         > Thanks,
> > > >         > Chris.
> > > >
> > > >         _______________________________________________
> > > >         Lsr mailing list
> > > >         Lsr@ietf.org
> > > >         https://www.ietf.org/mailman/listinfo/lsr
> > > >
> > > >
> > > >
> > >
> > > _______________________________________________
> > > Lsr mailing list
> > > Lsr@ietf.org
> > > https://www.ietf.org/mailman/listinfo/lsr
>
>

--0000000000008447a805a24e8493
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<div dir=3D"ltr"><div><br></div><div>Hi Les,</div><div><br></div>Ok very we=
ll.=C2=A0<div><br></div><div>So till this draft provides a text or referenc=
e to some other document how IGPs may use inband telemetry data for real pa=
th selection it does not fit to LSR charter. Fair.=C2=A0</div><div><br></di=
v><div>Hi Chris,</div><div><br></div><div>I am afraid=C2=A0we are looking a=
t this from completely different perspectives.=C2=A0</div><div><br></div><d=
iv>I consider=C2=A0this data to be a necessity for routing and you simply t=
reat it as some opaque telemetry. If we would think of it in the latter sen=
se sure you would be right. IGP is not a configuration push protocol. Suffi=
cient to observe how BGP became one :)=C2=A0</div><div><br></div><div>Many=
=C2=A0thx,</div><div>R.</div><div><br></div></div><br><div class=3D"gmail_q=
uote"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, Apr 2, 2020 at 8:46 AM =
Les Ginsberg (ginsberg) &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D=
"_blank">ginsberg@cisco.com</a>&gt; wrote:<br></div><blockquote class=3D"gm=
ail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,=
204,204);padding-left:1ex">Robert -<br>
<br>
First, +1 to what Chris has said.<br>
<br>
There is nothing in the lfit-capability draft that defines any information =
that can be used by IGPs to do what you suggest.<br>
Perhaps it is possible that information gleaned via a telemetry application=
 could be used by the IGPs to do something like what you suggest - but this=
 draft is not discussing/defining that. It is simply proposing to advertise=
 information about the capabilities of the lfit application on a given node=
. <br>
<br>
=C2=A0 =C2=A0Les<br>
<br>
&gt; -----Original Message-----<br>
&gt; From: Christian Hopps &lt;<a href=3D"mailto:chopps@chopps.org" target=
=3D"_blank">chopps@chopps.org</a>&gt;<br>
&gt; Sent: Thursday, April 02, 2020 5:13 AM<br>
&gt; To: Robert Raszuk &lt;<a href=3D"mailto:robert@raszuk.net" target=3D"_=
blank">robert@raszuk.net</a>&gt;<br>
&gt; Cc: Christian Hopps &lt;<a href=3D"mailto:chopps@chopps.org" target=3D=
"_blank">chopps@chopps.org</a>&gt;; Les Ginsberg (ginsberg)<br>
&gt; &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">ginsberg@c=
isco.com</a>&gt;; wangyali &lt;<a href=3D"mailto:wangyali11@huawei.com" tar=
get=3D"_blank">wangyali11@huawei.com</a>&gt;; Acee Lindem<br>
&gt; (acee) &lt;<a href=3D"mailto:acee@cisco.com" target=3D"_blank">acee@ci=
sco.com</a>&gt;; <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf=
.org</a>; Tianran Zhou<br>
&gt; &lt;<a href=3D"mailto:zhoutianran@huawei.com" target=3D"_blank">zhouti=
anran@huawei.com</a>&gt;<br>
&gt; Subject: Re: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-=
capability-02<br>
&gt; <br>
&gt; We have defined a perfectly acceptable and quite powerful way to do qu=
ery<br>
&gt; and configuration for routers, it&#39;s YANG. I&#39;d like to hear why=
 the the IETF<br>
&gt; standard mechanism for query and configuration can&#39;t work for this=
<br>
&gt; application.<br>
&gt; <br>
&gt; Telemetry is important, I don&#39;t think anyone has said or would say=
 that it isn&#39;t,<br>
&gt; but that seems orthogonal to this discussion.<br>
&gt; <br>
&gt; Thanks,<br>
&gt; Chris.<br>
&gt; [as WG member]<br>
&gt; <br>
&gt; <br>
&gt; &gt; On Apr 2, 2020, at 5:17 AM, Robert Raszuk &lt;<a href=3D"mailto:r=
obert@raszuk.net" target=3D"_blank">robert@raszuk.net</a>&gt; wrote:<br>
&gt; &gt;<br>
&gt; &gt; Hi Les,<br>
&gt; &gt;<br>
&gt; &gt; I would like to respectfully disagree with your assessment.<br>
&gt; &gt;<br>
&gt; &gt; The fact that today&#39;s IGP (or for that matter BGP) routing is=
 static from the<br>
&gt; perspective of not taking into consideration real performance measurem=
ents<br>
&gt; from the data plane to me is a bug not a feature.<br>
&gt; &gt;<br>
&gt; &gt; Building SPT based on static link metrics which in vast majority =
of cases<br>
&gt; today are emulated circuits on someone else IP backbone. It was a grea=
t idea<br>
&gt; when you constructed the network with connection oriented paradigm<br>
&gt; (Sonet,SDH, dark fiber, TDM ...) not connection less often best effort=
 one.<br>
&gt; &gt;<br>
&gt; &gt; So I find this proposal very useful and would vote for adopting i=
t in LSR WG.<br>
&gt; To me in-situ telemetry is not just some monitoring tool. It is an ext=
remely<br>
&gt; important element to influence how we compute reachability or at least=
 how<br>
&gt; we choose active forwarding paths from protocol RIBs to main RIB.<br>
&gt; &gt;<br>
&gt; &gt; If we extended IGPs to carry TE information, if we extended them =
to<br>
&gt; enable flexible algorithm based path computation I fail to understand =
why<br>
&gt; would we resist to natively enable all of the above with getting the i=
nputs<br>
&gt; from real networks to be used as to the parameters to the above mentio=
ned<br>
&gt; tools.<br>
&gt; &gt;<br>
&gt; &gt; Kind regards,<br>
&gt; &gt; R.<br>
&gt; &gt;<br>
&gt; &gt; On Thu, Apr 2, 2020 at 8:32 AM Les Ginsberg (ginsberg)<br>
&gt; &lt;ginsberg=3D<a href=3D"mailto:40cisco.com@dmarc.ietf.org" target=3D=
"_blank">40cisco.com@dmarc.ietf.org</a>&gt; wrote:<br>
&gt; &gt; Yali -<br>
&gt; &gt;<br>
&gt; &gt; There is a very significant difference between having IGPs advert=
ise an<br>
&gt; identifier for a service that they use as clients (BFD) and having IGP=
s<br>
&gt; advertise a set of capabilities/options for a telemetry application wh=
ich has<br>
&gt; no direct bearing on the function of the routing protocol.<br>
&gt; &gt;<br>
&gt; &gt; You are not the first to find using IGPs to flood application inf=
ormation very<br>
&gt; convenient.=C2=A0 But this is not the appropriate role for the IGPs an=
d over the<br>
&gt; years we have consistently resisted attempts to do so.<br>
&gt; &gt;<br>
&gt; &gt; Everything advertised in Router Capabilities today has some close=
<br>
&gt; relationship with the operation of the protocol. Do some of the existi=
ng<br>
&gt; advertisements &quot;bend the rules&quot; a bit more than I would pref=
er? Yes - but<br>
&gt; there has always been at least a close relationship to routing protoco=
l<br>
&gt; function.<br>
&gt; &gt; Here there is none.<br>
&gt; &gt;<br>
&gt; &gt; If you feel compelled to use IGPs to advertise application inform=
ation, you<br>
&gt; have RF6823 available (at least for IS-IS). But it is a &quot;high bar=
&quot; since it requires<br>
&gt; you also to use a separate IS-IS instance dedicated to advertising the=
<br>
&gt; application information (see RFC8202).<br>
&gt; &gt; I think Chris Hopps&#39;s suggestion to use Netconf/YANG to confi=
gure/retrieve<br>
&gt; what you need is most likely more attractive - but I will leave that f=
or you to<br>
&gt; decide.<br>
&gt; &gt;<br>
&gt; &gt; Using IGP Router Capabilities here is wrong in my view.<br>
&gt; &gt;<br>
&gt; &gt;=C2=A0 =C2=A0 Les<br>
&gt; &gt;<br>
&gt; &gt;<br>
&gt; &gt; &gt; -----Original Message-----<br>
&gt; &gt; &gt; From: wangyali &lt;<a href=3D"mailto:wangyali11@huawei.com" =
target=3D"_blank">wangyali11@huawei.com</a>&gt;<br>
&gt; &gt; &gt; Sent: Wednesday, April 01, 2020 8:12 PM<br>
&gt; &gt; &gt; To: Acee Lindem (acee) &lt;<a href=3D"mailto:acee@cisco.com"=
 target=3D"_blank">acee@cisco.com</a>&gt;; Les Ginsberg (ginsberg)<br>
&gt; &gt; &gt; &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">=
ginsberg@cisco.com</a>&gt;; Christian Hopps &lt;<a href=3D"mailto:chopps@ch=
opps.org" target=3D"_blank">chopps@chopps.org</a>&gt;<br>
&gt; &gt; &gt; Cc: <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ie=
tf.org</a>; Tianran Zhou &lt;<a href=3D"mailto:zhoutianran@huawei.com" targ=
et=3D"_blank">zhoutianran@huawei.com</a>&gt;<br>
&gt; &gt; &gt; Subject: =E7=AD=94=E5=A4=8D: [Lsr] A new version of I-D, dra=
ft-liu-lsr-isis-ifit-node-<br>
&gt; capability-<br>
&gt; &gt; &gt; 02<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; Hi Acee, Chris and Les,<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; This is Yali. Many thanks for your kind comments and suggest=
ion.<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; Besides of signaling MSD by IGP node CAPABILITY TLV, we lear=
ned that<br>
&gt; &gt; &gt; there&#39;s another RFC7883 that advertising S-BFD discrimin=
ators in IS-IS. In<br>
&gt; my<br>
&gt; &gt; &gt; understand, BFD is a protocol to detect faults in the bidire=
ctional path<br>
&gt; &gt; &gt; between two forwarding engines, including interface, data li=
nks, etc.<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; Similarly, IFIT provides a complete framework of a family of=
 on-path<br>
&gt; &gt; &gt; telemetry techniques, which are used to monitoring performan=
ce metrics<br>
&gt; of<br>
&gt; &gt; &gt; service flows, e.g. packet loss, delay. So we consider there=
&#39;s a same<br>
&gt; &gt; &gt; methodology with S-BFD that advertising IFIT node capabiliti=
es.<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; Please let us know your comments and opinion. Thanks.<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; Best regards,<br>
&gt; &gt; &gt; Yali<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----<br>
&gt; &gt; &gt; =E5=8F=91=E4=BB=B6=E4=BA=BA: Acee Lindem (acee) [mailto:<a h=
ref=3D"mailto:acee@cisco.com" target=3D"_blank">acee@cisco.com</a>]<br>
&gt; &gt; &gt; =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B44=E6=9C=
=881=E6=97=A5 20:29<br>
&gt; &gt; &gt; =E6=94=B6=E4=BB=B6=E4=BA=BA: Tianran Zhou &lt;<a href=3D"mai=
lto:zhoutianran@huawei.com" target=3D"_blank">zhoutianran@huawei.com</a>&gt=
;; Les Ginsberg<br>
&gt; (ginsberg)<br>
&gt; &gt; &gt; &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">=
ginsberg@cisco.com</a>&gt;; Christian Hopps &lt;<a href=3D"mailto:chopps@ch=
opps.org" target=3D"_blank">chopps@chopps.org</a>&gt;<br>
&gt; &gt; &gt; =E6=8A=84=E9=80=81: <a href=3D"mailto:lsr@ietf.org" target=
=3D"_blank">lsr@ietf.org</a>; wangyali &lt;<a href=3D"mailto:wangyali11@hua=
wei.com" target=3D"_blank">wangyali11@huawei.com</a>&gt;<br>
&gt; &gt; &gt; =E4=B8=BB=E9=A2=98: Re: [Lsr] A new version of I-D, draft-li=
u-lsr-isis-ifit-node-capability-<br>
&gt; 02<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; Speak as WG Member...<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; =EF=BB=BFOn 4/1/20, 8:08 AM, &quot;Acee Lindem (acee)&quot; =
&lt;<a href=3D"mailto:acee@cisco.com" target=3D"_blank">acee@cisco.com</a>&=
gt; wrote:<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0There is also a difference between some o=
f the existing applications<br>
&gt; &gt; &gt; advertised in IGP capabilities. For example, MSD is used wit=
h the routing<br>
&gt; &gt; &gt; information to construct SR paths. The information for all t=
hese OAM<br>
&gt; &gt; &gt; mechanisms doesn&#39;t share this affinity. Also, it seems l=
ike a slippery slope<br>
&gt; in<br>
&gt; &gt; &gt; what is needed for each of the mechanism.<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0Thanks,<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0Acee<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0On 4/1/20, 4:01 AM, &quot;Lsr on behalf o=
f Tianran Zhou&quot; &lt;lsr-<br>
&gt; <a href=3D"mailto:bounces@ietf.org" target=3D"_blank">bounces@ietf.org=
</a><br>
&gt; &gt; &gt; on behalf of <a href=3D"mailto:zhoutianran@huawei.com" targe=
t=3D"_blank">zhoutianran@huawei.com</a>&gt; wrote:<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hi Les,<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Thanks very much for your s=
uggestion. I have a quick look at rfc6823.<br>
&gt; &gt; &gt; Sounds like a good idea. I will think about it.<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Cheers,<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Tianran<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0-----Original Message-----<=
br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0From: Les Ginsberg (ginsber=
g) [mailto:<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">ginsberg=
@cisco.com</a>]<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Sent: Wednesday, April 1, 2=
020 1:47 PM<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0To: Tianran Zhou &lt;<a hre=
f=3D"mailto:zhoutianran@huawei.com" target=3D"_blank">zhoutianran@huawei.co=
m</a>&gt;; Christian Hopps<br>
&gt; &gt; &gt; &lt;<a href=3D"mailto:chopps@chopps.org" target=3D"_blank">c=
hopps@chopps.org</a>&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Cc: wangyali &lt;<a href=3D=
"mailto:wangyali11@huawei.com" target=3D"_blank">wangyali11@huawei.com</a>&=
gt;; <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</a><br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Subject: RE: [Lsr] A new ve=
rsion of I-D, draft-liu-lsr-isis-ifit-node-<br>
&gt; &gt; &gt; capability-02<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Tianran -<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0I am very much in agreement=
 with the points Chris has made.<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0IGPs do not exist to advert=
ise capabilities/configure applications -<br>
&gt; which<br>
&gt; &gt; &gt; seems to me to be what you are proposing here.<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0The fact that you can easil=
y define the encodings does not make it<br>
&gt; the<br>
&gt; &gt; &gt; right thing to do.<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0This issue was discussed at=
 length in the context of<br>
&gt; &gt; &gt; <a href=3D"https://tools.ietf.org/html/rfc6823" rel=3D"noref=
errer" target=3D"_blank">https://tools.ietf.org/html/rfc6823</a> . If you w=
ere proposing to use<br>
&gt; GENAPP I<br>
&gt; &gt; &gt; would not object - though I do think Chris has correctly poi=
nted out that<br>
&gt; &gt; &gt; NETCONF/YANG is likely a more appropriate solution for your =
use case.<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Les<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; -----Original Message-=
----<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; From: Tianran Zhou &lt=
;<a href=3D"mailto:zhoutianran@huawei.com" target=3D"_blank">zhoutianran@hu=
awei.com</a>&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Sent: Tuesday, March 3=
1, 2020 7:53 PM<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; To: Christian Hopps &l=
t;<a href=3D"mailto:chopps@chopps.org" target=3D"_blank">chopps@chopps.org<=
/a>&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Cc: wangyali &lt;<a hr=
ef=3D"mailto:wangyali11@huawei.com" target=3D"_blank">wangyali11@huawei.com=
</a>&gt;; Les Ginsberg (ginsberg)<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; &lt;<a href=3D"mailto:=
ginsberg@cisco.com" target=3D"_blank">ginsberg@cisco.com</a>&gt;; <a href=
=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</a><br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Subject: RE: [Lsr] A n=
ew version of I-D,<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; draft-liu-lsr-isis-ifi=
t-node-capability-02<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Hi Chris,<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Thanks for your quick =
reply, and please see inline.<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Cheers,<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Tianran<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; -----Original Message-=
----<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; From: Christian Hopps =
[mailto:<a href=3D"mailto:chopps@chopps.org" target=3D"_blank">chopps@chopp=
s.org</a>]<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Sent: Wednesday, April=
 1, 2020 10:00 AM<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; To: Tianran Zhou &lt;<=
a href=3D"mailto:zhoutianran@huawei.com" target=3D"_blank">zhoutianran@huaw=
ei.com</a>&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Cc: Christian Hopps &l=
t;<a href=3D"mailto:chopps@chopps.org" target=3D"_blank">chopps@chopps.org<=
/a>&gt;; wangyali<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; &lt;<a href=3D"mailto:=
wangyali11@huawei.com" target=3D"_blank">wangyali11@huawei.com</a>&gt;; Les=
 Ginsberg (ginsberg)<br>
&gt; &gt; &gt; &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">=
ginsberg@cisco.com</a>&gt;;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; <a href=3D"mailto:lsr@=
ietf.org" target=3D"_blank">lsr@ietf.org</a><br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Subject: Re: [Lsr] A n=
ew version of I-D,<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; draft-liu-lsr-isis-ifi=
t-node-capability-02<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; &gt; On Mar 31, 2020, =
at 9:28 PM, Tianran Zhou<br>
&gt; &gt; &gt; &lt;<a href=3D"mailto:zhoutianran@huawei.com" target=3D"_bla=
nk">zhoutianran@huawei.com</a>&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; wrote:<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; &gt; ZTR&gt; Let&#39;s=
 not boil the ocean to compare NETCONF/YANG or<br>
&gt; routing<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; protocol, which is bet=
ter. But I did not see the modification to<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; routing protocol with =
some TLVs is a heavy work, or more complex<br>
&gt; than<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; NETCONF/YANG.=C2=A0 I =
see both are available and useful.<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; I&#39;m not sure what =
you mean by boiling the ocean. I&#39;m saying that<br>
&gt; YANG<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; is built and intended =
for querying capabilities and configuring<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; routers. Why isn&#39;t=
 that where you are looking first for configuring<br>
&gt; your<br>
&gt; &gt; &gt; monitoring application?<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; ZTR&gt; I know NETCONF=
 can do both query and configuration. And I<br>
&gt; &gt; &gt; know<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; resent YANG-Push impro=
vements to reduce the polling.=C2=A0 But<br>
&gt; routing<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; protocol solutions are=
 also widely used for this. There are already<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; many RFCs and implemen=
tation practices. We considered both<br>
&gt; ways,<br>
&gt; &gt; &gt; and<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; aimed for different sc=
enarios.<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; You don&#39;t see the =
major difference between writing a YANG model<br>
&gt; vs<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; modifying all of the s=
tandard IETF routing protocols?<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; ZTR&gt; I know many di=
fferences between NETCONF and routing<br>
&gt; &gt; &gt; protocol.<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; There are many details=
 on both interfaces, implementations,<br>
&gt; scenarios<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; when comparing them. T=
hat&#39;s what I mean boil the ocean.<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Here I do not know wha=
t&#39;s the &quot;major difference&quot; you mean?<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Thanks,<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Chris.<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0___________________________=
____________________<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Lsr mailing list<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"mailto:Lsr@ietf.=
org" target=3D"_blank">Lsr@ietf.org</a><br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://www.ietf=
.org/mailman/listinfo/lsr" rel=3D"noreferrer" target=3D"_blank">https://www=
.ietf.org/mailman/listinfo/lsr</a><br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;<br>
&gt; &gt;<br>
&gt; &gt; _______________________________________________<br>
&gt; &gt; Lsr mailing list<br>
&gt; &gt; <a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a=
><br>
&gt; &gt; <a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"nore=
ferrer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
<br>
</blockquote></div>

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Les:

Hi!

Just to close this loop: I looked at -12 and we=E2=80=99re good. :-)

I=E2=80=99ll now wait for draft-ietf-ospf-te-link-attr-reuse to catch up to=
 process
both documents together.

Thanks!!

Alvaro.

On March 21, 2020 at 1:09:56 PM, Les Ginsberg (ginsberg) (ginsberg@cisco.co=
m)
wrote:

Following some offline discussion with you, V12 of the draft has been
posted to address your additional comments.

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<html><head><style>body{font-family:Helvetica,Arial;font-size:13px}</style>=
</head><body style=3D"word-wrap:break-word"><div style=3D"font-family:Helve=
tica,Arial;font-size:13px">Les:</div><div style=3D"font-family:Helvetica,Ar=
ial;font-size:13px"><br></div><div style=3D"font-family:Helvetica,Arial;fon=
t-size:13px">Hi!</div><div style=3D"font-family:Helvetica,Arial;font-size:1=
3px"><br></div><div style=3D"font-family:Helvetica,Arial;font-size:13px">Ju=
st to close this loop: I looked at -12 and we=E2=80=99re good. :-)</div><di=
v style=3D"font-family:Helvetica,Arial;font-size:13px"><br></div><div style=
=3D"font-family:Helvetica,Arial;font-size:13px">I=E2=80=99ll now wait for=
=C2=A0draft-ietf-ospf-te-link-attr-reuse to catch up to process both docume=
nts together.</div><div style=3D"font-family:Helvetica,Arial;font-size:13px=
"><br></div><div style=3D"font-family:Helvetica,Arial;font-size:13px">Thank=
s!!</div><div style=3D"font-family:Helvetica,Arial;font-size:13px"><br></di=
v><div style=3D"font-family:Helvetica,Arial;font-size:13px">Alvaro.</div> <=
br><p class=3D"airmail_on">On March 21, 2020 at 1:09:56 PM, Les Ginsberg (g=
insberg) (<a href=3D"mailto:ginsberg@cisco.com">ginsberg@cisco.com</a>) wro=
te:</p> <blockquote type=3D"cite" class=3D"clean_bq"><span><div><span style=
=3D"color:rgb(0,0,0);font-family:&#39;helvetica Neue&#39;,helvetica;font-si=
ze:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;lette=
r-spacing:normal;text-align:start;text-indent:0px;text-transform:none;white=
-space:normal;word-spacing:0px;background-color:rgb(255,255,255);display:in=
line!important;float:none">Following some offline discussion with you, V12 =
of the draft has been posted to address your additional comments.<span clas=
s=3D"Apple-converted-space">=C2=A0</span></span></div></span></blockquote> =
<div class=3D"gmail_signature"></div></body></html>

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Date: Thu, 2 Apr 2020 14:00:26 -0700
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, Robert Raszuk <robert@raszuk.net>
Cc: "=?utf-8?Q?lsr=40ietf.org?=" <lsr@ietf.org>, Christian Hopps <chopps@chopps.org>, "Acee Lindem (acee)" <acee@cisco.com>, Tianran Zhou <zhoutianran@huawei.com>, wangyali <wangyali11@huawei.com>
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References: <1520992FC97B944A9979C2FC1D7DB0F404DB1AD4@dggeml524-mbx.china.huawei.com> <MW3PR11MB4619361A2CA3A402A44914E5C1FE0@MW3PR11MB4619.namprd11.prod.outlook.com> <1520992FC97B944A9979C2FC1D7DB0F404DB2336@dggeml524-mbx.china.huawei.com> <68249E56-5702-4C15-9748-439E43F3EB0E@chopps.org> <1520992FC97B944A9979C2FC1D7DB0F404DEFC14@dggeml524-mbx.china.huawei.com> <A937FECB-2013-403E-89B2-47971514F6CF@chopps.org> <80a8f83c76d447dda48280495b3a80a7@huawei.com> <6F0E8437-5D82-4FAC-A061-69E56E1E161D@chopps.org> <2189e17f36764960bf2dcc554cde9ce0@huawei.com> <MW3PR11MB4619925BEF83B0C4512DD284C1C90@MW3PR11MB4619.namprd11.prod.outlook.com> <06e8443210924ac788c40fa15972cbdd@huawei.com> <C987B657-64D1-4C70-B471-ED9F1266B990@cisco.com> <3948044C-0CC9-4AE8-8541-4D23A5DF396E@cisco.com> <1520992FC97B944A9979C2FC1D7DB0F404DF089E@dggeml524-mbx.china.huawei.com> <MW3PR11MB46197F8C43B3200B07641838C1C60@MW3PR11MB4619.namprd11.prod.outlook.com> <CAOj+MMGsVkws0sTw4RRdb_SdWvsuh+2Dxc-upXqT2_pmpO_+Lg@mail.gmail.com> <6930807B-2FF0-4A5C-AD39-D05345C37A5E@chopps.org> <MW3PR11MB461955420610E933ACC44BC4C1C60@MW3PR11MB4619.namprd11.prod.outlook.com> <CAOj+MMHoTbDzZrA1ttPsdD5Tk7TADaR=ex5WGF=6+X3X1utoHg@mail.gmail.com>
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Subject: Re: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
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Robert,

This is unnecessary leakage of management plane into control plane.
The role of a routing protocol is to distribute: reachability (doh :-)) a=
nd any additional data that could influence routing decision wrt reachabi=
lity.
There are precedences of using IGP=E2=80=99s for different tasks, e.g. R=46=
C 5088 and similar, however should we do it again=3F

Specifically to use case described - I really don=E2=80=99t see how this =
information would be used in routing decisions (PCE computation). Moreove=
r, if the end-goal is to build a connected graph of the devices that have=
 a coherent i=46IT feature set it would require reoptimization on every c=
hange and quite complex computation logic (talking SR - on top of regular=
 constrains, MSD, etc).I=E2=80=99d also think that there=E2=80=99s mandat=
ory configuration of name-spaces and features supported, in other words -=
 autodiscovery is meaningless, it would still require as per device confi=
guration (hello YANG). Most of telemetry solutions are designed to pass t=
hought nodes that don=E2=80=99t support it transparently, so the real req=
uirement is really to know the sink-node (the one that is egress of the t=
elemetry domain and must remove all additional encapsulations).

As to the last point - we already have a kitchen-sink routing protocol =C2=
=A0;-)

Cheers,
Jeff
On Apr 2, 2020, 6:10 AM -0700, Robert Raszuk <robert=40raszuk.net>, wrote=
:
>
> Hi Les,
>
> Ok very well.
>
> So till this draft provides a text or reference to some other document =
how IGPs may use inband telemetry data for real path selection it does no=
t fit to LSR charter. =46air.
>
> Hi Chris,
>
> I am afraid=C2=A0we are looking at this from completely different persp=
ectives.
>
> I consider=C2=A0this data to be a necessity for routing and you simply =
treat it as some opaque telemetry. If we would think of it in the latter =
sense sure you would be right. IGP is not a configuration push protocol. =
Sufficient to observe how BGP became one :)
>
> Many=C2=A0thx,
> R.
>
>
> > On Thu, Apr 2, 2020 at 8:46 AM Les Ginsberg (ginsberg) <ginsberg=40ci=
sco.com> wrote:
> > > Robert -
> > >
> > > =46irst, +1 to what Chris has said.
> > >
> > > There is nothing in the lfit-capability draft that defines any info=
rmation that can be used by IGPs to do what you suggest.
> > > Perhaps it is possible that information gleaned via a telemetry app=
lication could be used by the IGPs to do something like what you suggest =
- but this draft is not discussing/defining that. It is simply proposing =
to advertise information about the capabilities of the lfit application o=
n a given node..
> > >
> > > =C2=A0 =C2=A0Les
> > >
> > > > -----Original Message-----
> > > > =46rom: Christian Hopps <chopps=40chopps.org>
> > > > Sent: Thursday, April 02, 2020 5:13 AM
> > > > To: Robert Raszuk <robert=40raszuk.net>
> > > > Cc: Christian Hopps <chopps=40chopps.org>; Les Ginsberg (ginsberg=
)
> > > > <ginsberg=40cisco.com>; wangyali <wangyali11=40huawei.com>; Acee =
Lindem
> > > > (acee) <acee=40cisco.com>; lsr=40ietf..org; Tianran Zhou
> > > > <zhoutianran=40huawei.com>
> > > > Subject: Re: =5BLsr=5D A new version of I-D, draft-liu-lsr-isis-i=
fit-node-capability-02
> > > >
> > > > We have defined a perfectly acceptable and quite powerful way to =
do query
> > > > and configuration for routers, it's YANG. I'd like to hear why th=
e the IET=46
> > > > standard mechanism for query and configuration can't work for thi=
s
> > > > application.
> > > >
> > > > Telemetry is important, I don't think anyone has said or would sa=
y that it isn't,
> > > > but that seems orthogonal to this discussion.
> > > >
> > > > Thanks,
> > > > Chris.
> > > > =5Bas WG member=5D
> > > >
> > > >
> > > > > On Apr 2, 2020, at 5:17 AM, Robert Raszuk <robert=40raszuk.net>=
 wrote:
> > > > >
> > > > > Hi Les,
> > > > >
> > > > > I would like to respectfully disagree with your assessment.
> > > > >
> > > > > The fact that today's IGP (or for that matter BGP) routing is s=
tatic from the
> > > > perspective of not taking into consideration real performance mea=
surements
> > > > from the data plane to me is a bug not a feature.
> > > > >
> > > > > Building SPT based on static link metrics which in vast majorit=
y of cases
> > > > today are emulated circuits on someone else IP backbone. It was a=
 great idea
> > > > when you constructed the network with connection oriented paradig=
m
> > > > (Sonet,SDH, dark fiber, TDM ...) not connection less often best e=
ffort one.
> > > > >
> > > > > So I find this proposal very useful and would vote for adopting=
 it in LSR WG.
> > > > To me in-situ telemetry is not just some monitoring tool. It is a=
n extremely
> > > > important element to influence how we compute reachability or at =
least how
> > > > we choose active forwarding paths from protocol RIBs to main RIB.=

> > > > >
> > > > > If we extended IGPs to carry TE information, if we extended the=
m to
> > > > enable flexible algorithm based path computation I fail to unders=
tand why
> > > > would we resist to natively enable all of the above with getting =
the inputs
> > > > from real networks to be used as to the parameters to the above m=
entioned
> > > > tools.
> > > > >
> > > > > Kind regards,
> > > > > R.
> > > > >
> > > > > On Thu, Apr 2, 2020 at 8:32 AM Les Ginsberg (ginsberg)
> > > > <ginsberg=3D40cisco.com=40dmarc.ietf.org> wrote:
> > > > > Yali -
> > > > >
> > > > > There is a very significant difference between having IGPs adve=
rtise an
> > > > identifier for a service that they use as clients (B=46D) and hav=
ing IGPs
> > > > advertise a set of capabilities/options for a telemetry applicati=
on which has
> > > > no direct bearing on the function of the routing protocol.
> > > > >
> > > > > You are not the first to find using IGPs to flood application i=
nformation very
> > > > convenient.=C2=A0 But this is not the appropriate role for the IG=
Ps and over the
> > > > years we have consistently resisted attempts to do so.
> > > > >
> > > > > Everything advertised in Router Capabilities today has some clo=
se
> > > > relationship with the operation of the protocol. Do some of the e=
xisting
> > > > advertisements =22bend the rules=22 a bit more than I would prefe=
r=3F Yes - but
> > > > there has always been at least a close relationship to routing pr=
otocol
> > > > function.
> > > > > Here there is none.
> > > > >
> > > > > If you feel compelled to use IGPs to advertise application info=
rmation, you
> > > > have R=466823 available (at least for IS-IS). But it is a =22high=
 bar=22 since it requires
> > > > you also to use a separate IS-IS instance dedicated to advertisin=
g the
> > > > application information (see R=46C8202).
> > > > > I think Chris Hopps's suggestion to use Netconf/YANG to configu=
re/retrieve
> > > > what you need is most likely more attractive - but I will leave t=
hat for you to
> > > > decide.
> > > > >
> > > > > Using IGP Router Capabilities here is wrong in my view.
> > > > >
> > > > >=C2=A0 =C2=A0 Les
> > > > >
> > > > >
> > > > > > -----Original Message-----
> > > > > > =46rom: wangyali <wangyali11=40huawei.com>
> > > > > > Sent: Wednesday, April 01, 2020 8:12 PM
> > > > > > To: Acee Lindem (acee) <acee=40cisco.com>; Les Ginsberg (gins=
berg)
> > > > > > <ginsberg=40cisco.com>; Christian Hopps <chopps=40chopps.org>=

> > > > > > Cc: lsr=40ietf.org; Tianran Zhou <zhoutianran=40huawei.com>
> > > > > > Subject: =E7=AD=94=E5=A4=8D: =5BLsr=5D A new version of I-D, =
draft-liu-lsr-isis-ifit-node-
> > > > capability-
> > > > > > 02
> > > > > >
> > > > > > Hi Acee, Chris and Les,
> > > > > >
> > > > > > This is Yali. Many thanks for your kind comments and suggesti=
on.
> > > > > >
> > > > > > Besides of signaling MSD by IGP node CAPABILITY TLV, we learn=
ed that
> > > > > > there's another R=46C7883 that advertising S-B=46D discrimina=
tors in IS-IS. In
> > > > my
> > > > > > understand, B=46D is a protocol to detect faults in the bidir=
ectional path
> > > > > > between two forwarding engines, including interface, data lin=
ks, etc.
> > > > > >
> > > > > > Similarly, I=46IT provides a complete framework of a family o=
f on-path
> > > > > > telemetry techniques, which are used to monitoring performanc=
e metrics
> > > > of
> > > > > > service flows, e.g. packet loss, delay. So we consider there'=
s a same
> > > > > > methodology with S-B=46D that advertising I=46IT node capabil=
ities.
> > > > > >
> > > > > > Please let us know your comments and opinion. Thanks.
> > > > > >
> > > > > > Best regards,
> > > > > > Yali
> > > > > >
> > > > > > -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
> > > > > > =E5=8F=91=E4=BB=B6=E4=BA=BA: Acee Lindem (acee) =5Bmailto:ace=
e=40cisco.com=5D
> > > > > > =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B44=E6=9C=88=
1=E6=97=A5 20:29
> > > > > > =E6=94=B6=E4=BB=B6=E4=BA=BA: Tianran Zhou <zhoutianran=40huaw=
ei.com>; Les Ginsberg
> > > > (ginsberg)
> > > > > > <ginsberg=40cisco.com>; Christian Hopps <chopps=40chopps.org>=

> > > > > > =E6=8A=84=E9=80=81: lsr=40ietf.org; wangyali <wangyali11=40hu=
awei.com>
> > > > > > =E4=B8=BB=E9=A2=98: Re: =5BLsr=5D A new version of I-D, draft=
-liu-lsr-isis-ifit-node-capability-
> > > > 02
> > > > > >
> > > > > > Speak as WG Member...
> > > > > >
> > > > > > On 4/1/20, 8:08 AM, =22Acee Lindem (acee)=22 <acee=40cisco.co=
m> wrote:
> > > > > >
> > > > > >=C2=A0 =C2=A0 =C2=A0There is also a difference between some of=
 the existing applications
> > > > > > advertised in IGP capabilities. =46or example, MSD is used wi=
th the routing
> > > > > > information to construct SR paths. The information for all th=
ese OAM
> > > > > > mechanisms doesn't share this affinity. Also, it seems like a=
 slippery slope
> > > > in
> > > > > > what is needed for each of the mechanism.
> > > > > >=C2=A0 =C2=A0 =C2=A0Thanks,
> > > > > >=C2=A0 =C2=A0 =C2=A0Acee
> > > > > >
> > > > > >=C2=A0 =C2=A0 =C2=A0On 4/1/20, 4:01 AM, =22Lsr on behalf of Ti=
anran Zhou=22 <lsr-
> > > > bounces=40ietf.org
> > > > > > on behalf of zhoutianran=40huawei.com> wrote:
> > > > > >
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hi Les,
> > > > > >
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Thanks very much for your su=
ggestion. I have a quick look at rfc6823.
> > > > > > Sounds like a good idea. I will think about it.
> > > > > >
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Cheers,
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Tianran
> > > > > >
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0-----Original Message-----
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=46rom: Les Ginsberg (ginsbe=
rg) =5Bmailto:ginsberg=40cisco.com=5D
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Sent: Wednesday, April 1, 20=
20 1:47 PM
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0To: Tianran Zhou <zhoutianra=
n=40huawei.com>; Christian Hopps
> > > > > > <chopps=40chopps.org>
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Cc: wangyali <wangyali11=40h=
uawei.com>; lsr=40ietf.org
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Subject: RE: =5BLsr=5D A new=
 version of I-D, draft-liu-lsr-isis-ifit-node-
> > > > > > capability-02
> > > > > >
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Tianran -
> > > > > >
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0I am very much in agreement =
with the points Chris has made.
> > > > > >
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0IGPs do not exist to adverti=
se capabilities/configure applications -
> > > > which
> > > > > > seems to me to be what you are proposing here.
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0The fact that you can easily=
 define the encodings does not make it
> > > > the
> > > > > > right thing to do.
> > > > > >
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0This issue was discussed at =
length in the context of
> > > > > > https://tools.ietf.org/html/rfc6823 . If you were proposing t=
o use
> > > > GENAPP I
> > > > > > would not object - though I do think Chris has correctly poin=
ted out that
> > > > > > NETCON=46/YANG is likely a more appropriate solution for your=
 use case.
> > > > > >
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Les
> > > > > >
> > > > > >
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> -----Original Message-----=

> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> =46rom: Tianran Zhou <zhou=
tianran=40huawei.com>
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> Sent: Tuesday, March 31, 2=
020 7:53 PM
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> To: Christian Hopps <chopp=
s=40chopps.org>
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> Cc: wangyali <wangyali11=40=
huawei.com>; Les Ginsberg (ginsberg)
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> <ginsberg=40cisco.com>; ls=
r=40ietf.org
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> Subject: RE: =5BLsr=5D A n=
ew version of I-D,
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> draft-liu-lsr-isis-ifit-no=
de-capability-02
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> Hi Chris,
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> Thanks for your quick repl=
y, and please see inline.
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> Cheers,
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> Tianran
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> -----Original Message-----=

> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> =46rom: Christian Hopps =5B=
mailto:chopps=40chopps.org=5D
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> Sent: Wednesday, April 1, =
2020 10:00 AM
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> To: Tianran Zhou <zhoutian=
ran=40huawei.com>
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> Cc: Christian Hopps <chopp=
s=40chopps.org>; wangyali
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> <wangyali11=40huawei.com>;=
 Les Ginsberg (ginsberg)
> > > > > > <ginsberg=40cisco.com>;
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> lsr=40ietf.org
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> Subject: Re: =5BLsr=5D A n=
ew version of I-D,
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> draft-liu-lsr-isis-ifit-no=
de-capability-02
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> > On Mar 31, 2020, at 9:28=
 PM, Tianran Zhou
> > > > > > <zhoutianran=40huawei.com>
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> wrote:
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> >
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> > ZTR> Let's not boil the =
ocean to compare NETCON=46/YANG or
> > > > routing
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> protocol, which is better.=
 But I did not see the modification to
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> routing protocol with some=
 TLVs is a heavy work, or more complex
> > > > than
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> NETCON=46/YANG.=C2=A0 I se=
e both are available and useful.
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> I'm not sure what you mean=
 by boiling the ocean. I'm saying that
> > > > YANG
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> is built and intended for =
querying capabilities and configuring
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> routers. Why isn't that wh=
ere you are looking first for configuring
> > > > your
> > > > > > monitoring application=3F
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> ZTR> I know NETCON=46 can =
do both query and configuration. And I
> > > > > > know
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> resent YANG-Push improveme=
nts to reduce the polling.=C2=A0 But
> > > > routing
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> protocol solutions are als=
o widely used for this. There are already
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> many R=46Cs and implementa=
tion practices. We considered both
> > > > ways,
> > > > > > and
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> aimed for different scenar=
ios.
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> You don't see the major di=
fference between writing a YANG model
> > > > vs
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> modifying all of the stand=
ard IET=46 routing protocols=3F
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> ZTR> I know many differenc=
es between NETCON=46 and routing
> > > > > > protocol.
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> There are many details on =
both interfaces, implementations,
> > > > scenarios
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> when comparing them. That'=
s what I mean boil the ocean.
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> Here I do not know what's =
the =22major difference=22 you mean=3F
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> Thanks,
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> Chris.
> > > > > >
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Lsr mailing list
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Lsr=40ietf.org
> > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0https://www..ietf.org/mailma=
n/listinfo/lsr
> > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > > =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F
> > > > > Lsr mailing list
> > > > > Lsr=40ietf.org
> > > > > https://www.ietf.org/mailman/listinfo/lsr
> > >
> =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F
> Lsr mailing list
> Lsr=40ietf.org
> https://www.ietf.org/mailman/listinfo/lsr

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<div name=3D=22messageBodySection=22>
<div dir=3D=22auto=22>Robert,
<div dir=3D=22auto=22><br /></div>
<div dir=3D=22auto=22>This is unnecessary leakage of management plane int=
o control plane.</div>
<div dir=3D=22auto=22>The role of a routing protocol is to distribute: re=
achability (doh :-)) and any additional data that could influence routing=
 decision wrt reachability.</div>
<div dir=3D=22auto=22>There are precedences of using IGP=E2=80=99s for di=
fferent tasks, e.g. R=46C 5088 and similar, however should we do it again=
=3F</div>
<div dir=3D=22auto=22><br /></div>
<div dir=3D=22auto=22>Specifically to use case described - I really don=E2=
=80=99t see how this information would be used in routing decisions (PCE =
computation). Moreover, if the end-goal is to build a connected graph of =
the devices that have a coherent i=46IT feature set it would require reop=
timization on every change and quite complex computation logic (talking S=
R - on top of regular constrains, MSD, etc).I=E2=80=99d also think that t=
here=E2=80=99s mandatory configuration of name-spaces and features suppor=
ted, in other words - autodiscovery is meaningless, it would still requir=
e as per device configuration (hello YANG). Most of telemetry solutions a=
re designed to pass thought nodes that don=E2=80=99t support it transpare=
ntly, so the real requirement is really to know the sink-node (the one th=
at is egress of the telemetry domain and must remove all additional encap=
sulations).&=23160;</div>
<div dir=3D=22auto=22><br /></div>
<div dir=3D=22auto=22>As to the last point - we already have a kitchen-si=
nk routing protocol &=23160;;-)</div>
</div>
</div>
<div name=3D=22messageSignatureSection=22><br />
<div class=3D=22match=46ont=22>Cheers,
<div>Jeff</div>
</div>
</div>
<div name=3D=22messageReplySection=22>On Apr 2, 2020, 6:10 AM -0700, Robe=
rt Raszuk &lt;robert=40raszuk.net&gt;, wrote:<br />
<blockquote type=3D=22cite=22 class=3D=22spark=5Fquote=22 style=3D=22marg=
in: 5px 5px; padding-left: 10px; border-left: thin solid =231abc9c;=22>
<div dir=3D=22ltr=22>
<div><br /></div>
<div>Hi Les,</div>
<div><br /></div>
Ok very well.&=23160;
<div><br /></div>
<div>So till this draft provides a text or reference to some other docume=
nt how IGPs may use inband telemetry data for real path selection it does=
 not fit to LSR charter. =46air.&=23160;</div>
<div><br /></div>
<div>Hi Chris,</div>
<div><br /></div>
<div>I am afraid&=23160;we are looking at this from completely different =
perspectives.&=23160;</div>
<div><br /></div>
<div>I consider&=23160;this data to be a necessity for routing and you si=
mply treat it as some opaque telemetry. If we would think of it in the la=
tter sense sure you would be right. IGP is not a configuration push proto=
col. Sufficient to observe how BGP became one :)&=23160;</div>
<div><br /></div>
<div>Many&=23160;thx,</div>
<div>R.</div>
<div><br /></div>
</div>
<br />
<div class=3D=22gmail=5Fquote=22>
<div dir=3D=22ltr=22 class=3D=22gmail=5Fattr=22>On Thu, Apr 2, 2020 at 8:=
46 AM Les Ginsberg (ginsberg) &lt;<a href=3D=22mailto:ginsberg=40cisco.co=
m=22 target=3D=22=5Fblank=22>ginsberg=40cisco.com</a>&gt; wrote:<br /></d=
iv>
<blockquote class=3D=22gmail=5Fquote spark=5Fquote=22 style=3D=22margin: =
5px 5px; padding-left: 10px; border-left: thin solid =23e67e22;=22>Robert=
 -<br />
<br />
=46irst, +1 to what Chris has said.<br />
<br />
There is nothing in the lfit-capability draft that defines any informatio=
n that can be used by IGPs to do what you suggest.<br />
Perhaps it is possible that information gleaned via a telemetry applicati=
on could be used by the IGPs to do something like what you suggest - but =
this draft is not discussing/defining that. It is simply proposing to adv=
ertise information about the capabilities of the lfit application on a gi=
ven node..<br />
<br />
&=23160; &=23160;Les<br />
<br />
&gt; -----Original Message-----<br />
&gt; =46rom: Christian Hopps &lt;<a href=3D=22mailto:chopps=40chopps.org=22=
 target=3D=22=5Fblank=22>chopps=40chopps.org</a>&gt;<br />
&gt; Sent: Thursday, April 02, 2020 5:13 AM<br />
&gt; To: Robert Raszuk &lt;<a href=3D=22mailto:robert=40raszuk.net=22 tar=
get=3D=22=5Fblank=22>robert=40raszuk.net</a>&gt;<br />
&gt; Cc: Christian Hopps &lt;<a href=3D=22mailto:chopps=40chopps.org=22 t=
arget=3D=22=5Fblank=22>chopps=40chopps.org</a>&gt;; Les Ginsberg (ginsber=
g)<br />
&gt; &lt;<a href=3D=22mailto:ginsberg=40cisco.com=22 target=3D=22=5Fblank=
=22>ginsberg=40cisco.com</a>&gt;; wangyali &lt;<a href=3D=22mailto:wangya=
li11=40huawei.com=22 target=3D=22=5Fblank=22>wangyali11=40huawei.com</a>&=
gt;; Acee Lindem<br />
&gt; (acee) &lt;<a href=3D=22mailto:acee=40cisco.com=22 target=3D=22=5Fbl=
ank=22>acee=40cisco.com</a>&gt;; <a href=3D=22mailto:lsr=40ietf.org=22 ta=
rget=3D=22=5Fblank=22>lsr=40ietf..org</a>; Tianran Zhou<br />
&gt; &lt;<a href=3D=22mailto:zhoutianran=40huawei.com=22 target=3D=22=5Fb=
lank=22>zhoutianran=40huawei.com</a>&gt;<br />
&gt; Subject: Re: =5BLsr=5D A new version of I-D, draft-liu-lsr-isis-ifit=
-node-capability-02<br />
&gt;<br />
&gt; We have defined a perfectly acceptable and quite powerful way to do =
query<br />
&gt; and configuration for routers, it's YANG. I'd like to hear why the t=
he IET=46<br />
&gt; standard mechanism for query and configuration can't work for this<b=
r />
&gt; application.<br />
&gt;<br />
&gt; Telemetry is important, I don't think anyone has said or would say t=
hat it isn't,<br />
&gt; but that seems orthogonal to this discussion.<br />
&gt;<br />
&gt; Thanks,<br />
&gt; Chris.<br />
&gt; =5Bas WG member=5D<br />
&gt;<br />
&gt;<br />
&gt; &gt; On Apr 2, 2020, at 5:17 AM, Robert Raszuk &lt;<a href=3D=22mail=
to:robert=40raszuk.net=22 target=3D=22=5Fblank=22>robert=40raszuk.net</a>=
&gt; wrote:<br />
&gt; &gt;<br />
&gt; &gt; Hi Les,<br />
&gt; &gt;<br />
&gt; &gt; I would like to respectfully disagree with your assessment.<br =
/>
&gt; &gt;<br />
&gt; &gt; The fact that today's IGP (or for that matter BGP) routing is s=
tatic from the<br />
&gt; perspective of not taking into consideration real performance measur=
ements<br />
&gt; from the data plane to me is a bug not a feature.<br />
&gt; &gt;<br />
&gt; &gt; Building SPT based on static link metrics which in vast majorit=
y of cases<br />
&gt; today are emulated circuits on someone else IP backbone. It was a gr=
eat idea<br />
&gt; when you constructed the network with connection oriented paradigm<b=
r />
&gt; (Sonet,SDH, dark fiber, TDM ...) not connection less often best effo=
rt one.<br />
&gt; &gt;<br />
&gt; &gt; So I find this proposal very useful and would vote for adopting=
 it in LSR WG.<br />
&gt; To me in-situ telemetry is not just some monitoring tool. It is an e=
xtremely<br />
&gt; important element to influence how we compute reachability or at lea=
st how<br />
&gt; we choose active forwarding paths from protocol RIBs to main RIB.<br=
 />
&gt; &gt;<br />
&gt; &gt; If we extended IGPs to carry TE information, if we extended the=
m to<br />
&gt; enable flexible algorithm based path computation I fail to understan=
d why<br />
&gt; would we resist to natively enable all of the above with getting the=
 inputs<br />
&gt; from real networks to be used as to the parameters to the above ment=
ioned<br />
&gt; tools.<br />
&gt; &gt;<br />
&gt; &gt; Kind regards,<br />
&gt; &gt; R.<br />
&gt; &gt;<br />
&gt; &gt; On Thu, Apr 2, 2020 at 8:32 AM Les Ginsberg (ginsberg)<br />
&gt; &lt;ginsberg=3D<a href=3D=22mailto:40cisco.com=40dmarc.ietf.org=22 t=
arget=3D=22=5Fblank=22>40cisco.com=40dmarc.ietf.org</a>&gt; wrote:<br />
&gt; &gt; Yali -<br />
&gt; &gt;<br />
&gt; &gt; There is a very significant difference between having IGPs adve=
rtise an<br />
&gt; identifier for a service that they use as clients (B=46D) and having=
 IGPs<br />
&gt; advertise a set of capabilities/options for a telemetry application =
which has<br />
&gt; no direct bearing on the function of the routing protocol.<br />
&gt; &gt;<br />
&gt; &gt; You are not the first to find using IGPs to flood application i=
nformation very<br />
&gt; convenient.&=23160; But this is not the appropriate role for the IGP=
s and over the<br />
&gt; years we have consistently resisted attempts to do so.<br />
&gt; &gt;<br />
&gt; &gt; Everything advertised in Router Capabilities today has some clo=
se<br />
&gt; relationship with the operation of the protocol. Do some of the exis=
ting<br />
&gt; advertisements =22bend the rules=22 a bit more than I would prefer=3F=
 Yes - but<br />
&gt; there has always been at least a close relationship to routing proto=
col<br />
&gt; function.<br />
&gt; &gt; Here there is none.<br />
&gt; &gt;<br />
&gt; &gt; If you feel compelled to use IGPs to advertise application info=
rmation, you<br />
&gt; have R=466823 available (at least for IS-IS). But it is a =22high ba=
r=22 since it requires<br />
&gt; you also to use a separate IS-IS instance dedicated to advertising t=
he<br />
&gt; application information (see R=46C8202).<br />
&gt; &gt; I think Chris Hopps's suggestion to use Netconf/YANG to configu=
re/retrieve<br />
&gt; what you need is most likely more attractive - but I will leave that=
 for you to<br />
&gt; decide.<br />
&gt; &gt;<br />
&gt; &gt; Using IGP Router Capabilities here is wrong in my view.<br />
&gt; &gt;<br />
&gt; &gt;&=23160; &=23160; Les<br />
&gt; &gt;<br />
&gt; &gt;<br />
&gt; &gt; &gt; -----Original Message-----<br />
&gt; &gt; &gt; =46rom: wangyali &lt;<a href=3D=22mailto:wangyali11=40huaw=
ei.com=22 target=3D=22=5Fblank=22>wangyali11=40huawei.com</a>&gt;<br />
&gt; &gt; &gt; Sent: Wednesday, April 01, 2020 8:12 PM<br />
&gt; &gt; &gt; To: Acee Lindem (acee) &lt;<a href=3D=22mailto:acee=40cisc=
o.com=22 target=3D=22=5Fblank=22>acee=40cisco.com</a>&gt;; Les Ginsberg (=
ginsberg)<br />
&gt; &gt; &gt; &lt;<a href=3D=22mailto:ginsberg=40cisco.com=22 target=3D=22=
=5Fblank=22>ginsberg=40cisco.com</a>&gt;; Christian Hopps &lt;<a href=3D=22=
mailto:chopps=40chopps.org=22 target=3D=22=5Fblank=22>chopps=40chopps.org=
</a>&gt;<br />
&gt; &gt; &gt; Cc: <a href=3D=22mailto:lsr=40ietf.org=22 target=3D=22=5Fb=
lank=22>lsr=40ietf.org</a>; Tianran Zhou &lt;<a href=3D=22mailto:zhoutian=
ran=40huawei.com=22 target=3D=22=5Fblank=22>zhoutianran=40huawei.com</a>&=
gt;<br />
&gt; &gt; &gt; Subject: =E7=AD=94=E5=A4=8D: =5BLsr=5D A new version of I-=
D, draft-liu-lsr-isis-ifit-node-<br />
&gt; capability-<br />
&gt; &gt; &gt; 02<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt; Hi Acee, Chris and Les,<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt; This is Yali. Many thanks for your kind comments and sugge=
stion.<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt; Besides of signaling MSD by IGP node CAPABILITY TLV, we le=
arned that<br />
&gt; &gt; &gt; there's another R=46C7883 that advertising S-B=46D discrim=
inators in IS-IS. In<br />
&gt; my<br />
&gt; &gt; &gt; understand, B=46D is a protocol to detect faults in the bi=
directional path<br />
&gt; &gt; &gt; between two forwarding engines, including interface, data =
links, etc.<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt; Similarly, I=46IT provides a complete framework of a famil=
y of on-path<br />
&gt; &gt; &gt; telemetry techniques, which are used to monitoring perform=
ance metrics<br />
&gt; of<br />
&gt; &gt; &gt; service flows, e.g. packet loss, delay. So we consider the=
re's a same<br />
&gt; &gt; &gt; methodology with S-B=46D that advertising I=46IT node capa=
bilities.<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt; Please let us know your comments and opinion. Thanks.<br /=
>
&gt; &gt; &gt;<br />
&gt; &gt; &gt; Best regards,<br />
&gt; &gt; &gt; Yali<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt; -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----<br />
&gt; &gt; &gt; =E5=8F=91=E4=BB=B6=E4=BA=BA: Acee Lindem (acee) =5Bmailto:=
<a href=3D=22mailto:acee=40cisco.com=22 target=3D=22=5Fblank=22>acee=40ci=
sco.com</a>=5D<br />
&gt; &gt; &gt; =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B44=E6=9C=
=881=E6=97=A5 20:29<br />
&gt; &gt; &gt; =E6=94=B6=E4=BB=B6=E4=BA=BA: Tianran Zhou &lt;<a href=3D=22=
mailto:zhoutianran=40huawei.com=22 target=3D=22=5Fblank=22>zhoutianran=40=
huawei.com</a>&gt;; Les Ginsberg<br />
&gt; (ginsberg)<br />
&gt; &gt; &gt; &lt;<a href=3D=22mailto:ginsberg=40cisco.com=22 target=3D=22=
=5Fblank=22>ginsberg=40cisco.com</a>&gt;; Christian Hopps &lt;<a href=3D=22=
mailto:chopps=40chopps.org=22 target=3D=22=5Fblank=22>chopps=40chopps.org=
</a>&gt;<br />
&gt; &gt; &gt; =E6=8A=84=E9=80=81: <a href=3D=22mailto:lsr=40ietf.org=22 =
target=3D=22=5Fblank=22>lsr=40ietf.org</a>; wangyali &lt;<a href=3D=22mai=
lto:wangyali11=40huawei.com=22 target=3D=22=5Fblank=22>wangyali11=40huawe=
i.com</a>&gt;<br />
&gt; &gt; &gt; =E4=B8=BB=E9=A2=98: Re: =5BLsr=5D A new version of I-D, dr=
aft-liu-lsr-isis-ifit-node-capability-<br />
&gt; 02<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt; Speak as WG Member...<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt; =EF=BB=BFOn 4/1/20, 8:08 AM, =22Acee Lindem (acee)=22 &lt;=
<a href=3D=22mailto:acee=40cisco.com=22 target=3D=22=5Fblank=22>acee=40ci=
sco.com</a>&gt; wrote:<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160;There is also a difference betwee=
n some of the existing applications<br />
&gt; &gt; &gt; advertised in IGP capabilities. =46or example, MSD is used=
 with the routing<br />
&gt; &gt; &gt; information to construct SR paths. The information for all=
 these OAM<br />
&gt; &gt; &gt; mechanisms doesn't share this affinity. Also, it seems lik=
e a slippery slope<br />
&gt; in<br />
&gt; &gt; &gt; what is needed for each of the mechanism.<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160;Thanks,<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160;Acee<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160;On 4/1/20, 4:01 AM, =22Lsr on beh=
alf of Tianran Zhou=22 &lt;lsr-<br />
&gt; <a href=3D=22mailto:bounces=40ietf.org=22 target=3D=22=5Fblank=22>bo=
unces=40ietf.org</a><br />
&gt; &gt; &gt; on behalf of <a href=3D=22mailto:zhoutianran=40huawei.com=22=
 target=3D=22=5Fblank=22>zhoutianran=40huawei.com</a>&gt; wrote:<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;Hi Les,<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;Thanks very muc=
h for your suggestion. I have a quick look at rfc6823.<br />
&gt; &gt; &gt; Sounds like a good idea. I will think about it.<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;Cheers,<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;Tianran<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;-----Original M=
essage-----<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;=46rom: Les Gin=
sberg (ginsberg) =5Bmailto:<a href=3D=22mailto:ginsberg=40cisco.com=22 ta=
rget=3D=22=5Fblank=22>ginsberg=40cisco.com</a>=5D<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;Sent: Wednesday=
, April 1, 2020 1:47 PM<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;To: Tianran Zho=
u &lt;<a href=3D=22mailto:zhoutianran=40huawei.com=22 target=3D=22=5Fblan=
k=22>zhoutianran=40huawei.com</a>&gt;; Christian Hopps<br />
&gt; &gt; &gt; &lt;<a href=3D=22mailto:chopps=40chopps.org=22 target=3D=22=
=5Fblank=22>chopps=40chopps.org</a>&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;Cc: wangyali &l=
t;<a href=3D=22mailto:wangyali11=40huawei.com=22 target=3D=22=5Fblank=22>=
wangyali11=40huawei.com</a>&gt;; <a href=3D=22mailto:lsr=40ietf.org=22 ta=
rget=3D=22=5Fblank=22>lsr=40ietf.org</a><br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;Subject: RE: =5B=
Lsr=5D A new version of I-D, draft-liu-lsr-isis-ifit-node-<br />
&gt; &gt; &gt; capability-02<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;Tianran -<br />=

&gt; &gt; &gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;I am very much =
in agreement with the points Chris has made.<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;IGPs do not exi=
st to advertise capabilities/configure applications -<br />
&gt; which<br />
&gt; &gt; &gt; seems to me to be what you are proposing here.<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;The fact that y=
ou can easily define the encodings does not make it<br />
&gt; the<br />
&gt; &gt; &gt; right thing to do.<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;This issue was =
discussed at length in the context of<br />
&gt; &gt; &gt; <a href=3D=22https://tools.ietf.org/html/rfc6823=22 rel=3D=
=22noreferrer=22 target=3D=22=5Fblank=22>https://tools.ietf.org/html/rfc6=
823</a> . If you were proposing to use<br />
&gt; GENAPP I<br />
&gt; &gt; &gt; would not object - though I do think Chris has correctly p=
ointed out that<br />
&gt; &gt; &gt; NETCON=46/YANG is likely a more appropriate solution for y=
our use case.<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; Les<b=
r />
&gt; &gt; &gt;<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; -----Origi=
nal Message-----<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; =46rom: Ti=
anran Zhou &lt;<a href=3D=22mailto:zhoutianran=40huawei.com=22 target=3D=22=
=5Fblank=22>zhoutianran=40huawei.com</a>&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; Sent: Tues=
day, March 31, 2020 7:53 PM<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; To: Christ=
ian Hopps &lt;<a href=3D=22mailto:chopps=40chopps.org=22 target=3D=22=5Fb=
lank=22>chopps=40chopps.org</a>&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; Cc: wangya=
li &lt;<a href=3D=22mailto:wangyali11=40huawei.com=22 target=3D=22=5Fblan=
k=22>wangyali11=40huawei.com</a>&gt;; Les Ginsberg (ginsberg)<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; &lt;<a hre=
f=3D=22mailto:ginsberg=40cisco.com=22 target=3D=22=5Fblank=22>ginsberg=40=
cisco.com</a>&gt;; <a href=3D=22mailto:lsr=40ietf.org=22 target=3D=22=5Fb=
lank=22>lsr=40ietf.org</a><br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; Subject: R=
E: =5BLsr=5D A new version of I-D,<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; draft-liu-=
lsr-isis-ifit-node-capability-02<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; Hi Chris,<=
br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; Thanks for=
 your quick reply, and please see inline.<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; Cheers,<br=
 />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; Tianran<br=
 />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; -----Origi=
nal Message-----<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; =46rom: Ch=
ristian Hopps =5Bmailto:<a href=3D=22mailto:chopps=40chopps.org=22 target=
=3D=22=5Fblank=22>chopps=40chopps.org</a>=5D<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; Sent: Wedn=
esday, April 1, 2020 10:00 AM<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; To: Tianra=
n Zhou &lt;<a href=3D=22mailto:zhoutianran=40huawei.com=22 target=3D=22=5F=
blank=22>zhoutianran=40huawei.com</a>&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; Cc: Christ=
ian Hopps &lt;<a href=3D=22mailto:chopps=40chopps.org=22 target=3D=22=5Fb=
lank=22>chopps=40chopps.org</a>&gt;; wangyali<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; &lt;<a hre=
f=3D=22mailto:wangyali11=40huawei.com=22 target=3D=22=5Fblank=22>wangyali=
11=40huawei.com</a>&gt;; Les Ginsberg (ginsberg)<br />
&gt; &gt; &gt; &lt;<a href=3D=22mailto:ginsberg=40cisco.com=22 target=3D=22=
=5Fblank=22>ginsberg=40cisco.com</a>&gt;;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; <a href=3D=
=22mailto:lsr=40ietf.org=22 target=3D=22=5Fblank=22>lsr=40ietf.org</a><br=
 />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; Subject: R=
e: =5BLsr=5D A new version of I-D,<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; draft-liu-=
lsr-isis-ifit-node-capability-02<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; &gt; On Ma=
r 31, 2020, at 9:28 PM, Tianran Zhou<br />
&gt; &gt; &gt; &lt;<a href=3D=22mailto:zhoutianran=40huawei.com=22 target=
=3D=22=5Fblank=22>zhoutianran=40huawei.com</a>&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; wrote:<br =
/>
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; &gt;<br />=

&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; &gt; ZTR&g=
t; Let's not boil the ocean to compare NETCON=46/YANG or<br />
&gt; routing<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; protocol, =
which is better. But I did not see the modification to<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; routing pr=
otocol with some TLVs is a heavy work, or more complex<br />
&gt; than<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; NETCON=46/=
YANG.&=23160; I see both are available and useful.<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; I'm not su=
re what you mean by boiling the ocean. I'm saying that<br />
&gt; YANG<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; is built a=
nd intended for querying capabilities and configuring<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; routers. W=
hy isn't that where you are looking first for configuring<br />
&gt; your<br />
&gt; &gt; &gt; monitoring application=3F<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; ZTR&gt; I =
know NETCON=46 can do both query and configuration. And I<br />
&gt; &gt; &gt; know<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; resent YAN=
G-Push improvements to reduce the polling.&=23160; But<br />
&gt; routing<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; protocol s=
olutions are also widely used for this. There are already<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; many R=46C=
s and implementation practices. We considered both<br />
&gt; ways,<br />
&gt; &gt; &gt; and<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; aimed for =
different scenarios.<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; You don't =
see the major difference between writing a YANG model<br />
&gt; vs<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; modifying =
all of the standard IET=46 routing protocols=3F<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; ZTR&gt; I =
know many differences between NETCON=46 and routing<br />
&gt; &gt; &gt; protocol.<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; There are =
many details on both interfaces, implementations,<br />
&gt; scenarios<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; when compa=
ring them. That's what I mean boil the ocean.<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; Here I do =
not know what's the =22major difference=22 you mean=3F<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; Thanks,<br=
 />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; Chris.<br =
/>
&gt; &gt; &gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;Lsr mailing lis=
t<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;<a href=3D=22ma=
ilto:Lsr=40ietf.org=22 target=3D=22=5Fblank=22>Lsr=40ietf.org</a><br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;<a href=3D=22ht=
tps://www.ietf..org/mailman/listinfo/lsr=22 rel=3D=22noreferrer=22 target=
=3D=22=5Fblank=22>https://www..ietf.org/mailman/listinfo/lsr</a><br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt;<br />
&gt; &gt;<br />
&gt; &gt; =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F<br />
&gt; &gt; Lsr mailing list<br />
&gt; &gt; <a href=3D=22mailto:Lsr=40ietf.org=22 target=3D=22=5Fblank=22>L=
sr=40ietf.org</a><br />
&gt; &gt; <a href=3D=22https://www.ietf.org/mailman/listinfo/lsr=22 rel=3D=
=22noreferrer=22 target=3D=22=5Fblank=22>https://www.ietf.org/mailman/lis=
tinfo/lsr</a><br />
<br /></blockquote>
</div>
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F<br />
Lsr mailing list<br />
Lsr=40ietf.org<br />
https://www.ietf.org/mailman/listinfo/lsr<br /></blockquote>
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References: <1520992FC97B944A9979C2FC1D7DB0F404DB1AD4@dggeml524-mbx.china.huawei.com> <MW3PR11MB4619361A2CA3A402A44914E5C1FE0@MW3PR11MB4619.namprd11.prod.outlook.com> <1520992FC97B944A9979C2FC1D7DB0F404DB2336@dggeml524-mbx.china.huawei.com> <68249E56-5702-4C15-9748-439E43F3EB0E@chopps.org> <1520992FC97B944A9979C2FC1D7DB0F404DEFC14@dggeml524-mbx.china.huawei.com> <A937FECB-2013-403E-89B2-47971514F6CF@chopps.org> <80a8f83c76d447dda48280495b3a80a7@huawei.com> <6F0E8437-5D82-4FAC-A061-69E56E1E161D@chopps.org> <2189e17f36764960bf2dcc554cde9ce0@huawei.com> <MW3PR11MB4619925BEF83B0C4512DD284C1C90@MW3PR11MB4619.namprd11.prod.outlook.com> <06e8443210924ac788c40fa15972cbdd@huawei.com> <C987B657-64D1-4C70-B471-ED9F1266B990@cisco.com> <3948044C-0CC9-4AE8-8541-4D23A5DF396E@cisco.com> <1520992FC97B944A9979C2FC1D7DB0F404DF089E@dggeml524-mbx.china.huawei.com> <MW3PR11MB46197F8C43B3200B07641838C1C60@MW3PR11MB4619.namprd11.prod.outlook.com> <CAOj+MMGsVkws0sTw4RRdb_SdWvsuh+2Dxc-upXqT2_pmpO_+Lg@mail.gmail.com> <6930807B-2FF0-4A5C-AD39-D05345C37A5E@chopps.org> <MW3PR11MB461955420610E933ACC44BC4C1C60@MW3PR11MB4619.namprd11.prod.outlook.com> <CAOj+MMHoTbDzZrA1ttPsdD5Tk7TADaR=ex5WGF=6+X3X1utoHg@mail.gmail.com> <bd193457-956c-47b0-a50b-8d1778e8349a@Spark>
In-Reply-To: <bd193457-956c-47b0-a50b-8d1778e8349a@Spark>
From: Robert Raszuk <robert@raszuk.net>
Date: Thu, 2 Apr 2020 23:17:13 +0200
Message-ID: <CAOj+MMGuRHVoJ3ez4nQ3O87J4U+-+yabYWeA1AEfj1UGAbPp7w@mail.gmail.com>
To: Jeff Tantsura <jefftant.ietf@gmail.com>
Cc: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>,  Christian Hopps <chopps@chopps.org>, "Acee Lindem (acee)" <acee@cisco.com>,  Tianran Zhou <zhoutianran@huawei.com>, wangyali <wangyali11@huawei.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/_iQVM4VQJtTwQdwE856khi_IVe0>
Subject: Re: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
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Jeff.

> The role of a routing protocol is to distribute: reachability (doh :-))
> *and any additional data that could influence routing decision wrt
reachability.  *

The bolded text is precisely the point here.

So let me provide a very simple example.

Today routers already compute CSPF. Moreover today routers are asked to use
custom/flexible algorithm to choose reachability paths.

So just imagine an operator who says:

Please compute my SPT with the consideration that end to end inband jitter
is not greater then 10 ms otherwise I do not want to see nodes which do not
meet that criteria in the reachability graph for application X.

or

Please compute my SPT with the consideration that end to end drop rate is
not greater then  5pps otherwise I do not want to see nodes which do not
meet that criteria in the reachability graph for application Y.

etc ...

If you consider such constrains to provide reachability for applications
you will likely see value that in-situ telemetry is your friend here.
Really best friend as without him you can not do the proper end to end path
exclusion for SPT computations.

Hint: All per link extensions which were added to IGPs are not going to
help here as drops or jitter may equally happen in the routers fabric on
fabric to LC boundaries or on the line cards and links. So you need end to
end test stream.

Many thx,
R.

PS. As we are talking LSR here it is strange that joining virtual LSR
meeting is not for everyone. I was waiting and tried three times today for
host approval to join which was not granted.

On Thu, Apr 2, 2020 at 11:00 PM Jeff Tantsura <jefftant.ietf@gmail.com>
wrote:

> Robert,
>
> This is unnecessary leakage of management plane into control plane.
> The role of a routing protocol is to distribute: reachability (doh :-))
> and any additional data that could influence routing decision wrt
> reachability.
> There are precedences of using IGP=E2=80=99s for different tasks, e.g. RF=
C 5088
> and similar, however should we do it again?
>
> Specifically to use case described - I really don=E2=80=99t see how this
> information would be used in routing decisions (PCE computation). Moreove=
r,
> if the end-goal is to build a connected graph of the devices that have a
> coherent iFIT feature set it would require reoptimization on every change
> and quite complex computation logic (talking SR - on top of regular
> constrains, MSD, etc).I=E2=80=99d also think that there=E2=80=99s mandato=
ry configuration
> of name-spaces and features supported, in other words - autodiscovery is
> meaningless, it would still require as per device configuration (hello
> YANG). Most of telemetry solutions are designed to pass thought nodes tha=
t
> don=E2=80=99t support it transparently, so the real requirement is really=
 to know
> the sink-node (the one that is egress of the telemetry domain and must
> remove all additional encapsulations).
>
> As to the last point - we already have a kitchen-sink routing protocol  ;=
-)
>
> Cheers,
> Jeff
> On Apr 2, 2020, 6:10 AM -0700, Robert Raszuk <robert@raszuk.net>, wrote:
>
>
> Hi Les,
>
> Ok very well.
>
> So till this draft provides a text or reference to some other document ho=
w
> IGPs may use inband telemetry data for real path selection it does not fi=
t
> to LSR charter. Fair.
>
> Hi Chris,
>
> I am afraid we are looking at this from completely different perspectives=
.
>
> I consider this data to be a necessity for routing and you simply treat i=
t
> as some opaque telemetry. If we would think of it in the latter sense sur=
e
> you would be right. IGP is not a configuration push protocol. Sufficient =
to
> observe how BGP became one :)
>
> Many thx,
> R.
>
>
> On Thu, Apr 2, 2020 at 8:46 AM Les Ginsberg (ginsberg) <ginsberg@cisco.co=
m>
> wrote:
>
>> Robert -
>>
>> First, +1 to what Chris has said.
>>
>> There is nothing in the lfit-capability draft that defines any
>> information that can be used by IGPs to do what you suggest.
>> Perhaps it is possible that information gleaned via a telemetry
>> application could be used by the IGPs to do something like what you sugg=
est
>> - but this draft is not discussing/defining that. It is simply proposing=
 to
>> advertise information about the capabilities of the lfit application on =
a
>> given node..
>>
>>    Les
>>
>> > -----Original Message-----
>> > From: Christian Hopps <chopps@chopps.org>
>> > Sent: Thursday, April 02, 2020 5:13 AM
>> > To: Robert Raszuk <robert@raszuk.net>
>> > Cc: Christian Hopps <chopps@chopps.org>; Les Ginsberg (ginsberg)
>> > <ginsberg@cisco.com>; wangyali <wangyali11@huawei.com>; Acee Lindem
>> > (acee) <acee@cisco.com>; lsr@ietf..org <lsr@ietf.org>; Tianran Zhou
>> > <zhoutianran@huawei.com>
>> > Subject: Re: [Lsr] A new version of I-D,
>> draft-liu-lsr-isis-ifit-node-capability-02
>> >
>> > We have defined a perfectly acceptable and quite powerful way to do
>> query
>> > and configuration for routers, it's YANG. I'd like to hear why the the
>> IETF
>> > standard mechanism for query and configuration can't work for this
>> > application.
>> >
>> > Telemetry is important, I don't think anyone has said or would say tha=
t
>> it isn't,
>> > but that seems orthogonal to this discussion.
>> >
>> > Thanks,
>> > Chris.
>> > [as WG member]
>> >
>> >
>> > > On Apr 2, 2020, at 5:17 AM, Robert Raszuk <robert@raszuk.net> wrote:
>> > >
>> > > Hi Les,
>> > >
>> > > I would like to respectfully disagree with your assessment.
>> > >
>> > > The fact that today's IGP (or for that matter BGP) routing is static
>> from the
>> > perspective of not taking into consideration real performance
>> measurements
>> > from the data plane to me is a bug not a feature.
>> > >
>> > > Building SPT based on static link metrics which in vast majority of
>> cases
>> > today are emulated circuits on someone else IP backbone. It was a grea=
t
>> idea
>> > when you constructed the network with connection oriented paradigm
>> > (Sonet,SDH, dark fiber, TDM ...) not connection less often best effort
>> one.
>> > >
>> > > So I find this proposal very useful and would vote for adopting it i=
n
>> LSR WG.
>> > To me in-situ telemetry is not just some monitoring tool. It is an
>> extremely
>> > important element to influence how we compute reachability or at least
>> how
>> > we choose active forwarding paths from protocol RIBs to main RIB.
>> > >
>> > > If we extended IGPs to carry TE information, if we extended them to
>> > enable flexible algorithm based path computation I fail to understand
>> why
>> > would we resist to natively enable all of the above with getting the
>> inputs
>> > from real networks to be used as to the parameters to the above
>> mentioned
>> > tools.
>> > >
>> > > Kind regards,
>> > > R.
>> > >
>> > > On Thu, Apr 2, 2020 at 8:32 AM Les Ginsberg (ginsberg)
>> > <ginsberg=3D40cisco.com@dmarc.ietf.org> wrote:
>> > > Yali -
>> > >
>> > > There is a very significant difference between having IGPs advertise
>> an
>> > identifier for a service that they use as clients (BFD) and having IGP=
s
>> > advertise a set of capabilities/options for a telemetry application
>> which has
>> > no direct bearing on the function of the routing protocol.
>> > >
>> > > You are not the first to find using IGPs to flood application
>> information very
>> > convenient.  But this is not the appropriate role for the IGPs and ove=
r
>> the
>> > years we have consistently resisted attempts to do so.
>> > >
>> > > Everything advertised in Router Capabilities today has some close
>> > relationship with the operation of the protocol. Do some of the existi=
ng
>> > advertisements "bend the rules" a bit more than I would prefer? Yes -
>> but
>> > there has always been at least a close relationship to routing protoco=
l
>> > function.
>> > > Here there is none.
>> > >
>> > > If you feel compelled to use IGPs to advertise application
>> information, you
>> > have RF6823 available (at least for IS-IS). But it is a "high bar"
>> since it requires
>> > you also to use a separate IS-IS instance dedicated to advertising the
>> > application information (see RFC8202).
>> > > I think Chris Hopps's suggestion to use Netconf/YANG to
>> configure/retrieve
>> > what you need is most likely more attractive - but I will leave that
>> for you to
>> > decide.
>> > >
>> > > Using IGP Router Capabilities here is wrong in my view.
>> > >
>> > >    Les
>> > >
>> > >
>> > > > -----Original Message-----
>> > > > From: wangyali <wangyali11@huawei.com>
>> > > > Sent: Wednesday, April 01, 2020 8:12 PM
>> > > > To: Acee Lindem (acee) <acee@cisco.com>; Les Ginsberg (ginsberg)
>> > > > <ginsberg@cisco.com>; Christian Hopps <chopps@chopps.org>
>> > > > Cc: lsr@ietf.org; Tianran Zhou <zhoutianran@huawei.com>
>> > > > Subject: =E7=AD=94=E5=A4=8D: [Lsr] A new version of I-D,
>> draft-liu-lsr-isis-ifit-node-
>> > capability-
>> > > > 02
>> > > >
>> > > > Hi Acee, Chris and Les,
>> > > >
>> > > > This is Yali. Many thanks for your kind comments and suggestion.
>> > > >
>> > > > Besides of signaling MSD by IGP node CAPABILITY TLV, we learned th=
at
>> > > > there's another RFC7883 that advertising S-BFD discriminators in
>> IS-IS. In
>> > my
>> > > > understand, BFD is a protocol to detect faults in the bidirectiona=
l
>> path
>> > > > between two forwarding engines, including interface, data links,
>> etc.
>> > > >
>> > > > Similarly, IFIT provides a complete framework of a family of on-pa=
th
>> > > > telemetry techniques, which are used to monitoring performance
>> metrics
>> > of
>> > > > service flows, e.g. packet loss, delay. So we consider there's a
>> same
>> > > > methodology with S-BFD that advertising IFIT node capabilities.
>> > > >
>> > > > Please let us know your comments and opinion. Thanks.
>> > > >
>> > > > Best regards,
>> > > > Yali
>> > > >
>> > > > -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
>> > > > =E5=8F=91=E4=BB=B6=E4=BA=BA: Acee Lindem (acee) [mailto:acee@cisco=
.com]
>> > > > =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B44=E6=9C=881=E6=
=97=A5 20:29
>> > > > =E6=94=B6=E4=BB=B6=E4=BA=BA: Tianran Zhou <zhoutianran@huawei.com>=
; Les Ginsberg
>> > (ginsberg)
>> > > > <ginsberg@cisco.com>; Christian Hopps <chopps@chopps.org>
>> > > > =E6=8A=84=E9=80=81: lsr@ietf.org; wangyali <wangyali11@huawei.com>
>> > > > =E4=B8=BB=E9=A2=98: Re: [Lsr] A new version of I-D,
>> draft-liu-lsr-isis-ifit-node-capability-
>> > 02
>> > > >
>> > > > Speak as WG Member...
>> > > >
>> > > > =EF=BB=BFOn 4/1/20, 8:08 AM, "Acee Lindem (acee)" <acee@cisco.com>=
 wrote:
>> > > >
>> > > >     There is also a difference between some of the existing
>> applications
>> > > > advertised in IGP capabilities. For example, MSD is used with the
>> routing
>> > > > information to construct SR paths. The information for all these O=
AM
>> > > > mechanisms doesn't share this affinity. Also, it seems like a
>> slippery slope
>> > in
>> > > > what is needed for each of the mechanism.
>> > > >     Thanks,
>> > > >     Acee
>> > > >
>> > > >     On 4/1/20, 4:01 AM, "Lsr on behalf of Tianran Zhou" <lsr-
>> > bounces@ietf.org
>> > > > on behalf of zhoutianran@huawei.com> wrote:
>> > > >
>> > > >         Hi Les,
>> > > >
>> > > >         Thanks very much for your suggestion. I have a quick look
>> at rfc6823.
>> > > > Sounds like a good idea. I will think about it.
>> > > >
>> > > >         Cheers,
>> > > >         Tianran
>> > > >
>> > > >         -----Original Message-----
>> > > >         From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]
>> > > >         Sent: Wednesday, April 1, 2020 1:47 PM
>> > > >         To: Tianran Zhou <zhoutianran@huawei.com>; Christian Hopps
>> > > > <chopps@chopps.org>
>> > > >         Cc: wangyali <wangyali11@huawei.com>; lsr@ietf.org
>> > > >         Subject: RE: [Lsr] A new version of I-D,
>> draft-liu-lsr-isis-ifit-node-
>> > > > capability-02
>> > > >
>> > > >         Tianran -
>> > > >
>> > > >         I am very much in agreement with the points Chris has made=
.
>> > > >
>> > > >         IGPs do not exist to advertise capabilities/configure
>> applications -
>> > which
>> > > > seems to me to be what you are proposing here.
>> > > >         The fact that you can easily define the encodings does not
>> make it
>> > the
>> > > > right thing to do.
>> > > >
>> > > >         This issue was discussed at length in the context of
>> > > > https://tools.ietf.org/html/rfc6823 . If you were proposing to use
>> > GENAPP I
>> > > > would not object - though I do think Chris has correctly pointed
>> out that
>> > > > NETCONF/YANG is likely a more appropriate solution for your use
>> case.
>> > > >
>> > > >            Les
>> > > >
>> > > >
>> > > >         > -----Original Message-----
>> > > >         > From: Tianran Zhou <zhoutianran@huawei.com>
>> > > >         > Sent: Tuesday, March 31, 2020 7:53 PM
>> > > >         > To: Christian Hopps <chopps@chopps.org>
>> > > >         > Cc: wangyali <wangyali11@huawei.com>; Les Ginsberg
>> (ginsberg)
>> > > >         > <ginsberg@cisco.com>; lsr@ietf.org
>> > > >         > Subject: RE: [Lsr] A new version of I-D,
>> > > >         > draft-liu-lsr-isis-ifit-node-capability-02
>> > > >         >
>> > > >         > Hi Chris,
>> > > >         > Thanks for your quick reply, and please see inline.
>> > > >         >
>> > > >         > Cheers,
>> > > >         > Tianran
>> > > >         >
>> > > >         > -----Original Message-----
>> > > >         > From: Christian Hopps [mailto:chopps@chopps.org]
>> > > >         > Sent: Wednesday, April 1, 2020 10:00 AM
>> > > >         > To: Tianran Zhou <zhoutianran@huawei.com>
>> > > >         > Cc: Christian Hopps <chopps@chopps.org>; wangyali
>> > > >         > <wangyali11@huawei.com>; Les Ginsberg (ginsberg)
>> > > > <ginsberg@cisco.com>;
>> > > >         > lsr@ietf.org
>> > > >         > Subject: Re: [Lsr] A new version of I-D,
>> > > >         > draft-liu-lsr-isis-ifit-node-capability-02
>> > > >         >
>> > > >         >
>> > > >         >
>> > > >         > > On Mar 31, 2020, at 9:28 PM, Tianran Zhou
>> > > > <zhoutianran@huawei.com>
>> > > >         > wrote:
>> > > >         > >
>> > > >         > > ZTR> Let's not boil the ocean to compare NETCONF/YANG =
or
>> > routing
>> > > >         > protocol, which is better. But I did not see the
>> modification to
>> > > >         > routing protocol with some TLVs is a heavy work, or more
>> complex
>> > than
>> > > >         > NETCONF/YANG.  I see both are available and useful.
>> > > >         >
>> > > >         > I'm not sure what you mean by boiling the ocean. I'm
>> saying that
>> > YANG
>> > > >         > is built and intended for querying capabilities and
>> configuring
>> > > >         > routers. Why isn't that where you are looking first for
>> configuring
>> > your
>> > > > monitoring application?
>> > > >         >
>> > > >         > ZTR> I know NETCONF can do both query and configuration.
>> And I
>> > > > know
>> > > >         > resent YANG-Push improvements to reduce the polling.  Bu=
t
>> > routing
>> > > >         > protocol solutions are also widely used for this. There
>> are already
>> > > >         > many RFCs and implementation practices. We considered bo=
th
>> > ways,
>> > > > and
>> > > >         > aimed for different scenarios.
>> > > >         >
>> > > >         > You don't see the major difference between writing a YAN=
G
>> model
>> > vs
>> > > >         > modifying all of the standard IETF routing protocols?
>> > > >         >
>> > > >         > ZTR> I know many differences between NETCONF and routing
>> > > > protocol.
>> > > >         > There are many details on both interfaces,
>> implementations,
>> > scenarios
>> > > >         > when comparing them. That's what I mean boil the ocean.
>> > > >         > Here I do not know what's the "major difference" you mea=
n?
>> > > >         >
>> > > >         > Thanks,
>> > > >         > Chris.
>> > > >
>> > > >         _______________________________________________
>> > > >         Lsr mailing list
>> > > >         Lsr@ietf.org
>> > > >         https://www..ietf.org/mailman/listinfo/lsr
>> <https://www.ietf..org/mailman/listinfo/lsr>
>> > > >
>> > > >
>> > > >
>> > >
>> > > _______________________________________________
>> > > Lsr mailing list
>> > > Lsr@ietf.org
>> > > https://www.ietf.org/mailman/listinfo/lsr
>>
>> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>
>

--000000000000aceb2105a25553ca
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Jeff.<div><br></div><div>&gt; The role of a routing protoc=
ol is to distribute: reachability (doh :-))=C2=A0</div><div>&gt; <b>and any=
 additional data that could influence routing decision wrt reachability.=C2=
=A0=C2=A0</b><br></div><div><b><br></b></div><div>The bolded text is precis=
ely the point here.=C2=A0</div><div><br></div><div>So let me provide a very=
 simple=C2=A0example.=C2=A0</div><div><br></div><div>Today routers already =
compute CSPF. Moreover today routers are asked to use custom/flexible algor=
ithm to choose reachability paths.=C2=A0</div><div><br></div><div>So just i=
magine an operator who says:=C2=A0</div><div><br></div><div>Please compute =
my SPT with the consideration that end to end inband jitter is not greater =
then=C2=A010 ms otherwise I do not want to see nodes which do not meet that=
 criteria in the reachability graph for application X.</div><div><br></div>=
<div>or=C2=A0</div><div><br></div><div>Please compute my SPT with the consi=
deration that end to end drop rate is not greater then=C2=A0 5pps otherwise=
 I do not want to see nodes which do not meet that criteria in the reachabi=
lity graph for application Y.=C2=A0</div><div><br></div><div>etc ...=C2=A0<=
/div><div><br></div><div>If you consider such constrains=C2=A0to provide re=
achability for applications you will likely=C2=A0see value that in-situ tel=
emetry is your friend here. Really best friend as without him you can not d=
o the proper end to end path exclusion for SPT computations.=C2=A0<br></div=
><div><br></div><div>Hint: All per link extensions which were added to IGPs=
 are not going to help here as drops or jitter may equally happen in the ro=
uters fabric on fabric to LC boundaries or on the line cards=C2=A0and links=
. So you need end to end test stream.=C2=A0</div><div><br></div><div>Many t=
hx,</div><div>R.</div><div><br></div><div>PS. As we are talking LSR here it=
 is strange that joining virtual LSR meeting is not for everyone. I was wai=
ting and tried three times today for host approval to join which was not gr=
anted.=C2=A0</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" cla=
ss=3D"gmail_attr">On Thu, Apr 2, 2020 at 11:00 PM Jeff Tantsura &lt;<a href=
=3D"mailto:jefftant.ietf@gmail.com">jefftant.ietf@gmail.com</a>&gt; wrote:<=
br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8e=
x;border-left:1px solid rgb(204,204,204);padding-left:1ex">



<div>
<div name=3D"messageBodySection">
<div dir=3D"auto">Robert,
<div dir=3D"auto"><br></div>
<div dir=3D"auto">This is unnecessary leakage of management plane into cont=
rol plane.</div>
<div dir=3D"auto">The role of a routing protocol is to distribute: reachabi=
lity (doh :-)) and any additional data that could influence routing decisio=
n wrt reachability.</div>
<div dir=3D"auto">There are precedences of using IGP=E2=80=99s for differen=
t tasks, e.g. RFC 5088 and similar, however should we do it again?</div>
<div dir=3D"auto"><br></div>
<div dir=3D"auto">Specifically to use case described - I really don=E2=80=
=99t see how this information would be used in routing decisions (PCE compu=
tation). Moreover, if the end-goal is to build a connected graph of the dev=
ices that have a coherent iFIT feature set it would require reoptimization =
on every change and quite complex computation logic (talking SR - on top of=
 regular constrains, MSD, etc).I=E2=80=99d also think that there=E2=80=99s =
mandatory configuration of name-spaces and features supported, in other wor=
ds - autodiscovery is meaningless, it would still require as per device con=
figuration (hello YANG). Most of telemetry solutions are designed to pass t=
hought nodes that don=E2=80=99t support it transparently, so the real requi=
rement is really to know the sink-node (the one that is egress of the telem=
etry domain and must remove all additional encapsulations).=C2=A0</div>
<div dir=3D"auto"><br></div>
<div dir=3D"auto">As to the last point - we already have a kitchen-sink rou=
ting protocol =C2=A0;-)</div>
</div>
</div>
<div name=3D"messageSignatureSection"><br>
<div>Cheers,
<div>Jeff</div>
</div>
</div>
<div name=3D"messageReplySection">On Apr 2, 2020, 6:10 AM -0700, Robert Ras=
zuk &lt;<a href=3D"mailto:robert@raszuk.net" target=3D"_blank">robert@raszu=
k.net</a>&gt;, wrote:<br>
<blockquote type=3D"cite" style=3D"margin:5px;padding-left:10px;border-left=
:thin solid rgb(26,188,156)">
<div dir=3D"ltr">
<div><br></div>
<div>Hi Les,</div>
<div><br></div>
Ok very well.=C2=A0
<div><br></div>
<div>So till this draft provides a text or reference to some other document=
 how IGPs may use inband telemetry data for real path selection it does not=
 fit to LSR charter. Fair.=C2=A0</div>
<div><br></div>
<div>Hi Chris,</div>
<div><br></div>
<div>I am afraid=C2=A0we are looking at this from completely different pers=
pectives.=C2=A0</div>
<div><br></div>
<div>I consider=C2=A0this data to be a necessity for routing and you simply=
 treat it as some opaque telemetry. If we would think of it in the latter s=
ense sure you would be right. IGP is not a configuration push protocol. Suf=
ficient to observe how BGP became one :)=C2=A0</div>
<div><br></div>
<div>Many=C2=A0thx,</div>
<div>R.</div>
<div><br></div>
</div>
<br>
<div class=3D"gmail_quote">
<div dir=3D"ltr" class=3D"gmail_attr">On Thu, Apr 2, 2020 at 8:46 AM Les Gi=
nsberg (ginsberg) &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blan=
k">ginsberg@cisco.com</a>&gt; wrote:<br></div>
<blockquote class=3D"gmail_quote" style=3D"margin:5px;padding-left:10px;bor=
der-left:thin solid rgb(230,126,34)">Robert -<br>
<br>
First, +1 to what Chris has said.<br>
<br>
There is nothing in the lfit-capability draft that defines any information =
that can be used by IGPs to do what you suggest.<br>
Perhaps it is possible that information gleaned via a telemetry application=
 could be used by the IGPs to do something like what you suggest - but this=
 draft is not discussing/defining that. It is simply proposing to advertise=
 information about the capabilities of the lfit application on a given node=
..<br>
<br>
=C2=A0 =C2=A0Les<br>
<br>
&gt; -----Original Message-----<br>
&gt; From: Christian Hopps &lt;<a href=3D"mailto:chopps@chopps.org" target=
=3D"_blank">chopps@chopps.org</a>&gt;<br>
&gt; Sent: Thursday, April 02, 2020 5:13 AM<br>
&gt; To: Robert Raszuk &lt;<a href=3D"mailto:robert@raszuk.net" target=3D"_=
blank">robert@raszuk.net</a>&gt;<br>
&gt; Cc: Christian Hopps &lt;<a href=3D"mailto:chopps@chopps.org" target=3D=
"_blank">chopps@chopps.org</a>&gt;; Les Ginsberg (ginsberg)<br>
&gt; &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">ginsberg@c=
isco.com</a>&gt;; wangyali &lt;<a href=3D"mailto:wangyali11@huawei.com" tar=
get=3D"_blank">wangyali11@huawei.com</a>&gt;; Acee Lindem<br>
&gt; (acee) &lt;<a href=3D"mailto:acee@cisco.com" target=3D"_blank">acee@ci=
sco.com</a>&gt;; <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf=
..org</a>; Tianran Zhou<br>
&gt; &lt;<a href=3D"mailto:zhoutianran@huawei.com" target=3D"_blank">zhouti=
anran@huawei.com</a>&gt;<br>
&gt; Subject: Re: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-=
capability-02<br>
&gt;<br>
&gt; We have defined a perfectly acceptable and quite powerful way to do qu=
ery<br>
&gt; and configuration for routers, it&#39;s YANG. I&#39;d like to hear why=
 the the IETF<br>
&gt; standard mechanism for query and configuration can&#39;t work for this=
<br>
&gt; application.<br>
&gt;<br>
&gt; Telemetry is important, I don&#39;t think anyone has said or would say=
 that it isn&#39;t,<br>
&gt; but that seems orthogonal to this discussion.<br>
&gt;<br>
&gt; Thanks,<br>
&gt; Chris.<br>
&gt; [as WG member]<br>
&gt;<br>
&gt;<br>
&gt; &gt; On Apr 2, 2020, at 5:17 AM, Robert Raszuk &lt;<a href=3D"mailto:r=
obert@raszuk.net" target=3D"_blank">robert@raszuk.net</a>&gt; wrote:<br>
&gt; &gt;<br>
&gt; &gt; Hi Les,<br>
&gt; &gt;<br>
&gt; &gt; I would like to respectfully disagree with your assessment.<br>
&gt; &gt;<br>
&gt; &gt; The fact that today&#39;s IGP (or for that matter BGP) routing is=
 static from the<br>
&gt; perspective of not taking into consideration real performance measurem=
ents<br>
&gt; from the data plane to me is a bug not a feature.<br>
&gt; &gt;<br>
&gt; &gt; Building SPT based on static link metrics which in vast majority =
of cases<br>
&gt; today are emulated circuits on someone else IP backbone. It was a grea=
t idea<br>
&gt; when you constructed the network with connection oriented paradigm<br>
&gt; (Sonet,SDH, dark fiber, TDM ...) not connection less often best effort=
 one.<br>
&gt; &gt;<br>
&gt; &gt; So I find this proposal very useful and would vote for adopting i=
t in LSR WG.<br>
&gt; To me in-situ telemetry is not just some monitoring tool. It is an ext=
remely<br>
&gt; important element to influence how we compute reachability or at least=
 how<br>
&gt; we choose active forwarding paths from protocol RIBs to main RIB.<br>
&gt; &gt;<br>
&gt; &gt; If we extended IGPs to carry TE information, if we extended them =
to<br>
&gt; enable flexible algorithm based path computation I fail to understand =
why<br>
&gt; would we resist to natively enable all of the above with getting the i=
nputs<br>
&gt; from real networks to be used as to the parameters to the above mentio=
ned<br>
&gt; tools.<br>
&gt; &gt;<br>
&gt; &gt; Kind regards,<br>
&gt; &gt; R.<br>
&gt; &gt;<br>
&gt; &gt; On Thu, Apr 2, 2020 at 8:32 AM Les Ginsberg (ginsberg)<br>
&gt; &lt;ginsberg=3D<a href=3D"mailto:40cisco.com@dmarc.ietf.org" target=3D=
"_blank">40cisco.com@dmarc.ietf.org</a>&gt; wrote:<br>
&gt; &gt; Yali -<br>
&gt; &gt;<br>
&gt; &gt; There is a very significant difference between having IGPs advert=
ise an<br>
&gt; identifier for a service that they use as clients (BFD) and having IGP=
s<br>
&gt; advertise a set of capabilities/options for a telemetry application wh=
ich has<br>
&gt; no direct bearing on the function of the routing protocol.<br>
&gt; &gt;<br>
&gt; &gt; You are not the first to find using IGPs to flood application inf=
ormation very<br>
&gt; convenient.=C2=A0 But this is not the appropriate role for the IGPs an=
d over the<br>
&gt; years we have consistently resisted attempts to do so.<br>
&gt; &gt;<br>
&gt; &gt; Everything advertised in Router Capabilities today has some close=
<br>
&gt; relationship with the operation of the protocol. Do some of the existi=
ng<br>
&gt; advertisements &quot;bend the rules&quot; a bit more than I would pref=
er? Yes - but<br>
&gt; there has always been at least a close relationship to routing protoco=
l<br>
&gt; function.<br>
&gt; &gt; Here there is none.<br>
&gt; &gt;<br>
&gt; &gt; If you feel compelled to use IGPs to advertise application inform=
ation, you<br>
&gt; have RF6823 available (at least for IS-IS). But it is a &quot;high bar=
&quot; since it requires<br>
&gt; you also to use a separate IS-IS instance dedicated to advertising the=
<br>
&gt; application information (see RFC8202).<br>
&gt; &gt; I think Chris Hopps&#39;s suggestion to use Netconf/YANG to confi=
gure/retrieve<br>
&gt; what you need is most likely more attractive - but I will leave that f=
or you to<br>
&gt; decide.<br>
&gt; &gt;<br>
&gt; &gt; Using IGP Router Capabilities here is wrong in my view.<br>
&gt; &gt;<br>
&gt; &gt;=C2=A0 =C2=A0 Les<br>
&gt; &gt;<br>
&gt; &gt;<br>
&gt; &gt; &gt; -----Original Message-----<br>
&gt; &gt; &gt; From: wangyali &lt;<a href=3D"mailto:wangyali11@huawei.com" =
target=3D"_blank">wangyali11@huawei.com</a>&gt;<br>
&gt; &gt; &gt; Sent: Wednesday, April 01, 2020 8:12 PM<br>
&gt; &gt; &gt; To: Acee Lindem (acee) &lt;<a href=3D"mailto:acee@cisco.com"=
 target=3D"_blank">acee@cisco.com</a>&gt;; Les Ginsberg (ginsberg)<br>
&gt; &gt; &gt; &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">=
ginsberg@cisco.com</a>&gt;; Christian Hopps &lt;<a href=3D"mailto:chopps@ch=
opps.org" target=3D"_blank">chopps@chopps.org</a>&gt;<br>
&gt; &gt; &gt; Cc: <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ie=
tf.org</a>; Tianran Zhou &lt;<a href=3D"mailto:zhoutianran@huawei.com" targ=
et=3D"_blank">zhoutianran@huawei.com</a>&gt;<br>
&gt; &gt; &gt; Subject: =E7=AD=94=E5=A4=8D: [Lsr] A new version of I-D, dra=
ft-liu-lsr-isis-ifit-node-<br>
&gt; capability-<br>
&gt; &gt; &gt; 02<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; Hi Acee, Chris and Les,<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; This is Yali. Many thanks for your kind comments and suggest=
ion.<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; Besides of signaling MSD by IGP node CAPABILITY TLV, we lear=
ned that<br>
&gt; &gt; &gt; there&#39;s another RFC7883 that advertising S-BFD discrimin=
ators in IS-IS. In<br>
&gt; my<br>
&gt; &gt; &gt; understand, BFD is a protocol to detect faults in the bidire=
ctional path<br>
&gt; &gt; &gt; between two forwarding engines, including interface, data li=
nks, etc.<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; Similarly, IFIT provides a complete framework of a family of=
 on-path<br>
&gt; &gt; &gt; telemetry techniques, which are used to monitoring performan=
ce metrics<br>
&gt; of<br>
&gt; &gt; &gt; service flows, e.g. packet loss, delay. So we consider there=
&#39;s a same<br>
&gt; &gt; &gt; methodology with S-BFD that advertising IFIT node capabiliti=
es.<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; Please let us know your comments and opinion. Thanks.<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; Best regards,<br>
&gt; &gt; &gt; Yali<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----<br>
&gt; &gt; &gt; =E5=8F=91=E4=BB=B6=E4=BA=BA: Acee Lindem (acee) [mailto:<a h=
ref=3D"mailto:acee@cisco.com" target=3D"_blank">acee@cisco.com</a>]<br>
&gt; &gt; &gt; =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B44=E6=9C=
=881=E6=97=A5 20:29<br>
&gt; &gt; &gt; =E6=94=B6=E4=BB=B6=E4=BA=BA: Tianran Zhou &lt;<a href=3D"mai=
lto:zhoutianran@huawei.com" target=3D"_blank">zhoutianran@huawei.com</a>&gt=
;; Les Ginsberg<br>
&gt; (ginsberg)<br>
&gt; &gt; &gt; &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">=
ginsberg@cisco.com</a>&gt;; Christian Hopps &lt;<a href=3D"mailto:chopps@ch=
opps.org" target=3D"_blank">chopps@chopps.org</a>&gt;<br>
&gt; &gt; &gt; =E6=8A=84=E9=80=81: <a href=3D"mailto:lsr@ietf.org" target=
=3D"_blank">lsr@ietf.org</a>; wangyali &lt;<a href=3D"mailto:wangyali11@hua=
wei.com" target=3D"_blank">wangyali11@huawei.com</a>&gt;<br>
&gt; &gt; &gt; =E4=B8=BB=E9=A2=98: Re: [Lsr] A new version of I-D, draft-li=
u-lsr-isis-ifit-node-capability-<br>
&gt; 02<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; Speak as WG Member...<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; =EF=BB=BFOn 4/1/20, 8:08 AM, &quot;Acee Lindem (acee)&quot; =
&lt;<a href=3D"mailto:acee@cisco.com" target=3D"_blank">acee@cisco.com</a>&=
gt; wrote:<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0There is also a difference between some o=
f the existing applications<br>
&gt; &gt; &gt; advertised in IGP capabilities. For example, MSD is used wit=
h the routing<br>
&gt; &gt; &gt; information to construct SR paths. The information for all t=
hese OAM<br>
&gt; &gt; &gt; mechanisms doesn&#39;t share this affinity. Also, it seems l=
ike a slippery slope<br>
&gt; in<br>
&gt; &gt; &gt; what is needed for each of the mechanism.<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0Thanks,<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0Acee<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0On 4/1/20, 4:01 AM, &quot;Lsr on behalf o=
f Tianran Zhou&quot; &lt;lsr-<br>
&gt; <a href=3D"mailto:bounces@ietf.org" target=3D"_blank">bounces@ietf.org=
</a><br>
&gt; &gt; &gt; on behalf of <a href=3D"mailto:zhoutianran@huawei.com" targe=
t=3D"_blank">zhoutianran@huawei.com</a>&gt; wrote:<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hi Les,<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Thanks very much for your s=
uggestion. I have a quick look at rfc6823.<br>
&gt; &gt; &gt; Sounds like a good idea. I will think about it.<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Cheers,<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Tianran<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0-----Original Message-----<=
br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0From: Les Ginsberg (ginsber=
g) [mailto:<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">ginsberg=
@cisco.com</a>]<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Sent: Wednesday, April 1, 2=
020 1:47 PM<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0To: Tianran Zhou &lt;<a hre=
f=3D"mailto:zhoutianran@huawei.com" target=3D"_blank">zhoutianran@huawei.co=
m</a>&gt;; Christian Hopps<br>
&gt; &gt; &gt; &lt;<a href=3D"mailto:chopps@chopps.org" target=3D"_blank">c=
hopps@chopps.org</a>&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Cc: wangyali &lt;<a href=3D=
"mailto:wangyali11@huawei.com" target=3D"_blank">wangyali11@huawei.com</a>&=
gt;; <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</a><br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Subject: RE: [Lsr] A new ve=
rsion of I-D, draft-liu-lsr-isis-ifit-node-<br>
&gt; &gt; &gt; capability-02<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Tianran -<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0I am very much in agreement=
 with the points Chris has made.<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0IGPs do not exist to advert=
ise capabilities/configure applications -<br>
&gt; which<br>
&gt; &gt; &gt; seems to me to be what you are proposing here.<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0The fact that you can easil=
y define the encodings does not make it<br>
&gt; the<br>
&gt; &gt; &gt; right thing to do.<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0This issue was discussed at=
 length in the context of<br>
&gt; &gt; &gt; <a href=3D"https://tools.ietf.org/html/rfc6823" rel=3D"noref=
errer" target=3D"_blank">https://tools.ietf.org/html/rfc6823</a> . If you w=
ere proposing to use<br>
&gt; GENAPP I<br>
&gt; &gt; &gt; would not object - though I do think Chris has correctly poi=
nted out that<br>
&gt; &gt; &gt; NETCONF/YANG is likely a more appropriate solution for your =
use case.<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Les<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; -----Original Message-=
----<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; From: Tianran Zhou &lt=
;<a href=3D"mailto:zhoutianran@huawei.com" target=3D"_blank">zhoutianran@hu=
awei.com</a>&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Sent: Tuesday, March 3=
1, 2020 7:53 PM<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; To: Christian Hopps &l=
t;<a href=3D"mailto:chopps@chopps.org" target=3D"_blank">chopps@chopps.org<=
/a>&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Cc: wangyali &lt;<a hr=
ef=3D"mailto:wangyali11@huawei.com" target=3D"_blank">wangyali11@huawei.com=
</a>&gt;; Les Ginsberg (ginsberg)<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; &lt;<a href=3D"mailto:=
ginsberg@cisco.com" target=3D"_blank">ginsberg@cisco.com</a>&gt;; <a href=
=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</a><br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Subject: RE: [Lsr] A n=
ew version of I-D,<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; draft-liu-lsr-isis-ifi=
t-node-capability-02<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Hi Chris,<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Thanks for your quick =
reply, and please see inline.<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Cheers,<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Tianran<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; -----Original Message-=
----<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; From: Christian Hopps =
[mailto:<a href=3D"mailto:chopps@chopps.org" target=3D"_blank">chopps@chopp=
s.org</a>]<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Sent: Wednesday, April=
 1, 2020 10:00 AM<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; To: Tianran Zhou &lt;<=
a href=3D"mailto:zhoutianran@huawei.com" target=3D"_blank">zhoutianran@huaw=
ei.com</a>&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Cc: Christian Hopps &l=
t;<a href=3D"mailto:chopps@chopps.org" target=3D"_blank">chopps@chopps.org<=
/a>&gt;; wangyali<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; &lt;<a href=3D"mailto:=
wangyali11@huawei.com" target=3D"_blank">wangyali11@huawei.com</a>&gt;; Les=
 Ginsberg (ginsberg)<br>
&gt; &gt; &gt; &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">=
ginsberg@cisco.com</a>&gt;;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; <a href=3D"mailto:lsr@=
ietf.org" target=3D"_blank">lsr@ietf.org</a><br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Subject: Re: [Lsr] A n=
ew version of I-D,<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; draft-liu-lsr-isis-ifi=
t-node-capability-02<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; &gt; On Mar 31, 2020, =
at 9:28 PM, Tianran Zhou<br>
&gt; &gt; &gt; &lt;<a href=3D"mailto:zhoutianran@huawei.com" target=3D"_bla=
nk">zhoutianran@huawei.com</a>&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; wrote:<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; &gt; ZTR&gt; Let&#39;s=
 not boil the ocean to compare NETCONF/YANG or<br>
&gt; routing<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; protocol, which is bet=
ter. But I did not see the modification to<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; routing protocol with =
some TLVs is a heavy work, or more complex<br>
&gt; than<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; NETCONF/YANG.=C2=A0 I =
see both are available and useful.<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; I&#39;m not sure what =
you mean by boiling the ocean. I&#39;m saying that<br>
&gt; YANG<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; is built and intended =
for querying capabilities and configuring<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; routers. Why isn&#39;t=
 that where you are looking first for configuring<br>
&gt; your<br>
&gt; &gt; &gt; monitoring application?<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; ZTR&gt; I know NETCONF=
 can do both query and configuration. And I<br>
&gt; &gt; &gt; know<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; resent YANG-Push impro=
vements to reduce the polling.=C2=A0 But<br>
&gt; routing<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; protocol solutions are=
 also widely used for this. There are already<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; many RFCs and implemen=
tation practices. We considered both<br>
&gt; ways,<br>
&gt; &gt; &gt; and<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; aimed for different sc=
enarios.<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; You don&#39;t see the =
major difference between writing a YANG model<br>
&gt; vs<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; modifying all of the s=
tandard IETF routing protocols?<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; ZTR&gt; I know many di=
fferences between NETCONF and routing<br>
&gt; &gt; &gt; protocol.<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; There are many details=
 on both interfaces, implementations,<br>
&gt; scenarios<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; when comparing them. T=
hat&#39;s what I mean boil the ocean.<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Here I do not know wha=
t&#39;s the &quot;major difference&quot; you mean?<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Thanks,<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Chris.<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0___________________________=
____________________<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Lsr mailing list<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"mailto:Lsr@ietf.=
org" target=3D"_blank">Lsr@ietf.org</a><br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://www.ietf=
..org/mailman/listinfo/lsr" rel=3D"noreferrer" target=3D"_blank">https://ww=
w..ietf.org/mailman/listinfo/lsr</a><br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;<br>
&gt; &gt;<br>
&gt; &gt; _______________________________________________<br>
&gt; &gt; Lsr mailing list<br>
&gt; &gt; <a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a=
><br>
&gt; &gt; <a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"nore=
ferrer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
<br></blockquote>
</div>
_______________________________________________<br>
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Date: Thu, 2 Apr 2020 17:56:46 -0400
Cc: Christian Hopps <chopps@chopps.org>, Jeff Tantsura <jefftant.ietf@gmail.com>, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>, "Acee Lindem (acee)" <acee@cisco.com>, Tianran Zhou <zhoutianran@huawei.com>, wangyali <wangyali11@huawei.com>
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To: Robert Raszuk <robert@raszuk.net>
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Subject: Re: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
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> On Apr 2, 2020, at 5:17 PM, Robert Raszuk <robert@raszuk.net> wrote:
>=20
> Jeff.
>=20
> > The role of a routing protocol is to distribute: reachability (doh =
:-))=20
> > and any additional data that could influence routing decision wrt =
reachability. =20
>=20
> The bolded text is precisely the point here.=20
>=20
> So let me provide a very simple example.=20
>=20
> Today routers already compute CSPF. Moreover today routers are asked =
to use custom/flexible algorithm to choose reachability paths.=20
>=20
> So just imagine an operator who says:=20
>=20
> Please compute my SPT with the consideration that end to end inband =
jitter is not greater then 10 ms otherwise I do not want to see nodes =
which do not meet that criteria in the reachability graph for =
application X.
>=20
> or=20
>=20
> Please compute my SPT with the consideration that end to end drop rate =
is not greater then  5pps otherwise I do not want to see nodes which do =
not meet that criteria in the reachability graph for application Y.=20
>=20
> etc ...=20
>=20
> If you consider such constrains to provide reachability for =
applications you will likely see value that in-situ telemetry is your =
friend here. Really best friend as without him you can not do the proper =
end to end path exclusion for SPT computations.=20

[as wg member] Are you thinking that shifting traffic to a router is not =
going to affect it's jitter/drop rate?

> Hint: All per link extensions which were added to IGPs are not going =
to help here as drops or jitter may equally happen in the routers fabric =
on fabric to LC boundaries or on the line cards and links. So you need =
end to end test stream.=20
>=20
> Many thx,
> R.
>=20
> PS. As we are talking LSR here it is strange that joining virtual LSR =
meeting is not for everyone. I was waiting and tried three times today =
for host approval to join which was not granted.=20

will reply separately to this.

Thanks,
Chris.

>=20
> On Thu, Apr 2, 2020 at 11:00 PM Jeff Tantsura =
<jefftant.ietf@gmail.com> wrote:
> Robert,
>=20
> This is unnecessary leakage of management plane into control plane.
> The role of a routing protocol is to distribute: reachability (doh =
:-)) and any additional data that could influence routing decision wrt =
reachability.
> There are precedences of using IGP=E2=80=99s for different tasks, e.g. =
RFC 5088 and similar, however should we do it again?
>=20
> Specifically to use case described - I really don=E2=80=99t see how =
this information would be used in routing decisions (PCE computation). =
Moreover, if the end-goal is to build a connected graph of the devices =
that have a coherent iFIT feature set it would require reoptimization on =
every change and quite complex computation logic (talking SR - on top of =
regular constrains, MSD, etc).I=E2=80=99d also think that there=E2=80=99s =
mandatory configuration of name-spaces and features supported, in other =
words - autodiscovery is meaningless, it would still require as per =
device configuration (hello YANG). Most of telemetry solutions are =
designed to pass thought nodes that don=E2=80=99t support it =
transparently, so the real requirement is really to know the sink-node =
(the one that is egress of the telemetry domain and must remove all =
additional encapsulations).=20
>=20
> As to the last point - we already have a kitchen-sink routing protocol =
 ;-)
>=20
> Cheers,
> Jeff
> On Apr 2, 2020, 6:10 AM -0700, Robert Raszuk <robert@raszuk.net>, =
wrote:
>>=20
>> Hi Les,
>>=20
>> Ok very well.=20
>>=20
>> So till this draft provides a text or reference to some other =
document how IGPs may use inband telemetry data for real path selection =
it does not fit to LSR charter. Fair.=20
>>=20
>> Hi Chris,
>>=20
>> I am afraid we are looking at this from completely different =
perspectives.=20
>>=20
>> I consider this data to be a necessity for routing and you simply =
treat it as some opaque telemetry. If we would think of it in the latter =
sense sure you would be right. IGP is not a configuration push protocol. =
Sufficient to observe how BGP became one :)=20
>>=20
>> Many thx,
>> R.
>>=20
>>=20
>> On Thu, Apr 2, 2020 at 8:46 AM Les Ginsberg (ginsberg) =
<ginsberg@cisco.com> wrote:
>> Robert -
>>=20
>> First, +1 to what Chris has said.
>>=20
>> There is nothing in the lfit-capability draft that defines any =
information that can be used by IGPs to do what you suggest.
>> Perhaps it is possible that information gleaned via a telemetry =
application could be used by the IGPs to do something like what you =
suggest - but this draft is not discussing/defining that. It is simply =
proposing to advertise information about the capabilities of the lfit =
application on a given node..
>>=20
>>    Les
>>=20
>> > -----Original Message-----
>> > From: Christian Hopps <chopps@chopps.org>
>> > Sent: Thursday, April 02, 2020 5:13 AM
>> > To: Robert Raszuk <robert@raszuk.net>
>> > Cc: Christian Hopps <chopps@chopps.org>; Les Ginsberg (ginsberg)
>> > <ginsberg@cisco.com>; wangyali <wangyali11@huawei.com>; Acee Lindem
>> > (acee) <acee@cisco.com>; lsr@ietf..org; Tianran Zhou
>> > <zhoutianran@huawei.com>
>> > Subject: Re: [Lsr] A new version of I-D, =
draft-liu-lsr-isis-ifit-node-capability-02
>> >
>> > We have defined a perfectly acceptable and quite powerful way to do =
query
>> > and configuration for routers, it's YANG. I'd like to hear why the =
the IETF
>> > standard mechanism for query and configuration can't work for this
>> > application.
>> >
>> > Telemetry is important, I don't think anyone has said or would say =
that it isn't,
>> > but that seems orthogonal to this discussion.
>> >
>> > Thanks,
>> > Chris.
>> > [as WG member]
>> >
>> >
>> > > On Apr 2, 2020, at 5:17 AM, Robert Raszuk <robert@raszuk.net> =
wrote:
>> > >
>> > > Hi Les,
>> > >
>> > > I would like to respectfully disagree with your assessment.
>> > >
>> > > The fact that today's IGP (or for that matter BGP) routing is =
static from the
>> > perspective of not taking into consideration real performance =
measurements
>> > from the data plane to me is a bug not a feature.
>> > >
>> > > Building SPT based on static link metrics which in vast majority =
of cases
>> > today are emulated circuits on someone else IP backbone. It was a =
great idea
>> > when you constructed the network with connection oriented paradigm
>> > (Sonet,SDH, dark fiber, TDM ...) not connection less often best =
effort one.
>> > >
>> > > So I find this proposal very useful and would vote for adopting =
it in LSR WG.
>> > To me in-situ telemetry is not just some monitoring tool. It is an =
extremely
>> > important element to influence how we compute reachability or at =
least how
>> > we choose active forwarding paths from protocol RIBs to main RIB.
>> > >
>> > > If we extended IGPs to carry TE information, if we extended them =
to
>> > enable flexible algorithm based path computation I fail to =
understand why
>> > would we resist to natively enable all of the above with getting =
the inputs
>> > from real networks to be used as to the parameters to the above =
mentioned
>> > tools.
>> > >
>> > > Kind regards,
>> > > R.
>> > >
>> > > On Thu, Apr 2, 2020 at 8:32 AM Les Ginsberg (ginsberg)
>> > <ginsberg=3D40cisco.com@dmarc.ietf.org> wrote:
>> > > Yali -
>> > >
>> > > There is a very significant difference between having IGPs =
advertise an
>> > identifier for a service that they use as clients (BFD) and having =
IGPs
>> > advertise a set of capabilities/options for a telemetry application =
which has
>> > no direct bearing on the function of the routing protocol.
>> > >
>> > > You are not the first to find using IGPs to flood application =
information very
>> > convenient.  But this is not the appropriate role for the IGPs and =
over the
>> > years we have consistently resisted attempts to do so.
>> > >
>> > > Everything advertised in Router Capabilities today has some close
>> > relationship with the operation of the protocol. Do some of the =
existing
>> > advertisements "bend the rules" a bit more than I would prefer? Yes =
- but
>> > there has always been at least a close relationship to routing =
protocol
>> > function.
>> > > Here there is none.
>> > >
>> > > If you feel compelled to use IGPs to advertise application =
information, you
>> > have RF6823 available (at least for IS-IS). But it is a "high bar" =
since it requires
>> > you also to use a separate IS-IS instance dedicated to advertising =
the
>> > application information (see RFC8202).
>> > > I think Chris Hopps's suggestion to use Netconf/YANG to =
configure/retrieve
>> > what you need is most likely more attractive - but I will leave =
that for you to
>> > decide.
>> > >
>> > > Using IGP Router Capabilities here is wrong in my view.
>> > >
>> > >    Les
>> > >
>> > >
>> > > > -----Original Message-----
>> > > > From: wangyali <wangyali11@huawei.com>
>> > > > Sent: Wednesday, April 01, 2020 8:12 PM
>> > > > To: Acee Lindem (acee) <acee@cisco.com>; Les Ginsberg =
(ginsberg)
>> > > > <ginsberg@cisco.com>; Christian Hopps <chopps@chopps.org>
>> > > > Cc: lsr@ietf.org; Tianran Zhou <zhoutianran@huawei.com>
>> > > > Subject: =E7=AD=94=E5=A4=8D: [Lsr] A new version of I-D, =
draft-liu-lsr-isis-ifit-node-
>> > capability-
>> > > > 02
>> > > >
>> > > > Hi Acee, Chris and Les,
>> > > >
>> > > > This is Yali. Many thanks for your kind comments and =
suggestion.
>> > > >
>> > > > Besides of signaling MSD by IGP node CAPABILITY TLV, we learned =
that
>> > > > there's another RFC7883 that advertising S-BFD discriminators =
in IS-IS. In
>> > my
>> > > > understand, BFD is a protocol to detect faults in the =
bidirectional path
>> > > > between two forwarding engines, including interface, data =
links, etc.
>> > > >
>> > > > Similarly, IFIT provides a complete framework of a family of =
on-path
>> > > > telemetry techniques, which are used to monitoring performance =
metrics
>> > of
>> > > > service flows, e.g. packet loss, delay. So we consider there's =
a same
>> > > > methodology with S-BFD that advertising IFIT node capabilities.
>> > > >
>> > > > Please let us know your comments and opinion. Thanks.
>> > > >
>> > > > Best regards,
>> > > > Yali
>> > > >
>> > > > -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
>> > > > =E5=8F=91=E4=BB=B6=E4=BA=BA: Acee Lindem (acee) =
[mailto:acee@cisco.com]
>> > > > =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B44=E6=9C=881=E6=
=97=A5 20:29
>> > > > =E6=94=B6=E4=BB=B6=E4=BA=BA: Tianran Zhou =
<zhoutianran@huawei.com>; Les Ginsberg
>> > (ginsberg)
>> > > > <ginsberg@cisco.com>; Christian Hopps <chopps@chopps.org>
>> > > > =E6=8A=84=E9=80=81: lsr@ietf.org; wangyali =
<wangyali11@huawei.com>
>> > > > =E4=B8=BB=E9=A2=98: Re: [Lsr] A new version of I-D, =
draft-liu-lsr-isis-ifit-node-capability-
>> > 02
>> > > >
>> > > > Speak as WG Member...
>> > > >
>> > > > =EF=BB=BFOn 4/1/20, 8:08 AM, "Acee Lindem (acee)" =
<acee@cisco.com> wrote:
>> > > >
>> > > >     There is also a difference between some of the existing =
applications
>> > > > advertised in IGP capabilities. For example, MSD is used with =
the routing
>> > > > information to construct SR paths. The information for all =
these OAM
>> > > > mechanisms doesn't share this affinity. Also, it seems like a =
slippery slope
>> > in
>> > > > what is needed for each of the mechanism.
>> > > >     Thanks,
>> > > >     Acee
>> > > >
>> > > >     On 4/1/20, 4:01 AM, "Lsr on behalf of Tianran Zhou" <lsr-
>> > bounces@ietf.org
>> > > > on behalf of zhoutianran@huawei.com> wrote:
>> > > >
>> > > >         Hi Les,
>> > > >
>> > > >         Thanks very much for your suggestion. I have a quick =
look at rfc6823.
>> > > > Sounds like a good idea. I will think about it.
>> > > >
>> > > >         Cheers,
>> > > >         Tianran
>> > > >
>> > > >         -----Original Message-----
>> > > >         From: Les Ginsberg (ginsberg) =
[mailto:ginsberg@cisco.com]
>> > > >         Sent: Wednesday, April 1, 2020 1:47 PM
>> > > >         To: Tianran Zhou <zhoutianran@huawei.com>; Christian =
Hopps
>> > > > <chopps@chopps.org>
>> > > >         Cc: wangyali <wangyali11@huawei.com>; lsr@ietf.org
>> > > >         Subject: RE: [Lsr] A new version of I-D, =
draft-liu-lsr-isis-ifit-node-
>> > > > capability-02
>> > > >
>> > > >         Tianran -
>> > > >
>> > > >         I am very much in agreement with the points Chris has =
made.
>> > > >
>> > > >         IGPs do not exist to advertise capabilities/configure =
applications -
>> > which
>> > > > seems to me to be what you are proposing here.
>> > > >         The fact that you can easily define the encodings does =
not make it
>> > the
>> > > > right thing to do.
>> > > >
>> > > >         This issue was discussed at length in the context of
>> > > > https://tools.ietf.org/html/rfc6823 . If you were proposing to =
use
>> > GENAPP I
>> > > > would not object - though I do think Chris has correctly =
pointed out that
>> > > > NETCONF/YANG is likely a more appropriate solution for your use =
case.
>> > > >
>> > > >            Les
>> > > >
>> > > >
>> > > >         > -----Original Message-----
>> > > >         > From: Tianran Zhou <zhoutianran@huawei.com>
>> > > >         > Sent: Tuesday, March 31, 2020 7:53 PM
>> > > >         > To: Christian Hopps <chopps@chopps.org>
>> > > >         > Cc: wangyali <wangyali11@huawei.com>; Les Ginsberg =
(ginsberg)
>> > > >         > <ginsberg@cisco.com>; lsr@ietf.org
>> > > >         > Subject: RE: [Lsr] A new version of I-D,
>> > > >         > draft-liu-lsr-isis-ifit-node-capability-02
>> > > >         >
>> > > >         > Hi Chris,
>> > > >         > Thanks for your quick reply, and please see inline.
>> > > >         >
>> > > >         > Cheers,
>> > > >         > Tianran
>> > > >         >
>> > > >         > -----Original Message-----
>> > > >         > From: Christian Hopps [mailto:chopps@chopps.org]
>> > > >         > Sent: Wednesday, April 1, 2020 10:00 AM
>> > > >         > To: Tianran Zhou <zhoutianran@huawei.com>
>> > > >         > Cc: Christian Hopps <chopps@chopps.org>; wangyali
>> > > >         > <wangyali11@huawei.com>; Les Ginsberg (ginsberg)
>> > > > <ginsberg@cisco.com>;
>> > > >         > lsr@ietf.org
>> > > >         > Subject: Re: [Lsr] A new version of I-D,
>> > > >         > draft-liu-lsr-isis-ifit-node-capability-02
>> > > >         >
>> > > >         >
>> > > >         >
>> > > >         > > On Mar 31, 2020, at 9:28 PM, Tianran Zhou
>> > > > <zhoutianran@huawei.com>
>> > > >         > wrote:
>> > > >         > >
>> > > >         > > ZTR> Let's not boil the ocean to compare =
NETCONF/YANG or
>> > routing
>> > > >         > protocol, which is better. But I did not see the =
modification to
>> > > >         > routing protocol with some TLVs is a heavy work, or =
more complex
>> > than
>> > > >         > NETCONF/YANG.  I see both are available and useful.
>> > > >         >
>> > > >         > I'm not sure what you mean by boiling the ocean. I'm =
saying that
>> > YANG
>> > > >         > is built and intended for querying capabilities and =
configuring
>> > > >         > routers. Why isn't that where you are looking first =
for configuring
>> > your
>> > > > monitoring application?
>> > > >         >
>> > > >         > ZTR> I know NETCONF can do both query and =
configuration. And I
>> > > > know
>> > > >         > resent YANG-Push improvements to reduce the polling.  =
But
>> > routing
>> > > >         > protocol solutions are also widely used for this. =
There are already
>> > > >         > many RFCs and implementation practices. We considered =
both
>> > ways,
>> > > > and
>> > > >         > aimed for different scenarios.
>> > > >         >
>> > > >         > You don't see the major difference between writing a =
YANG model
>> > vs
>> > > >         > modifying all of the standard IETF routing protocols?
>> > > >         >
>> > > >         > ZTR> I know many differences between NETCONF and =
routing
>> > > > protocol.
>> > > >         > There are many details on both interfaces, =
implementations,
>> > scenarios
>> > > >         > when comparing them. That's what I mean boil the =
ocean.
>> > > >         > Here I do not know what's the "major difference" you =
mean?
>> > > >         >
>> > > >         > Thanks,
>> > > >         > Chris.
>> > > >
>> > > >         _______________________________________________
>> > > >         Lsr mailing list
>> > > >         Lsr@ietf.org
>> > > >         https://www..ietf.org/mailman/listinfo/lsr
>> > > >
>> > > >
>> > > >
>> > >
>> > > _______________________________________________
>> > > Lsr mailing list
>> > > Lsr@ietf.org
>> > > https://www.ietf.org/mailman/listinfo/lsr
>>=20
>> _______________________________________________
>> Lsr mailing list
>> Lsr@ietf.org
>> https://www.ietf.org/mailman/listinfo/lsr


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Date: Thu, 2 Apr 2020 18:00:03 -0400
Cc: Christian Hopps <chopps@chopps.org>, Jeff Tantsura <jefftant.ietf@gmail.com>, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>, Tianran Zhou <zhoutianran@huawei.com>, "Acee Lindem (acee)" <acee@cisco.com>, wangyali <wangyali11@huawei.com>
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Subject: [Lsr] problem joining interim [Re:  A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02]
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> On Apr 2, 2020, at 5:17 PM, Robert Raszuk <robert@raszuk.net> wrote:
>=20
> Many thx,
> R.
>=20
> PS. As we are talking LSR here it is strange that joining virtual LSR =
meeting is not for everyone. I was waiting and tried three times today =
for host approval to join which was not granted.=20
>=20

I am very sorry to hear this! We had 64 participants, at least at one =
point that I saw. I set the meeting up, and I don't believe there is any =
way to exclude anyone in particular, I certainly would never have chosen =
to do that.

However, Webex has a password requirement when setting up meetings (I =
guess, I tried to not have one, it wouldn't let me) which we included in =
all the details wherever the details were posted, it was "linkstate".

I did notice an email, from webex, during the meeting about a request =
from Bruno to join as guest, but he was in the participant list when I =
then checked. I didn't receive any other emails like that (and FWIW I =
had 5 windows over 2 monitors going at once trying to manage all this, =
so noticing the 1 email was lucky).

Did it let you skip entering a password (or did it not offer the option =
in the first place)?

It would be good to figure this out before the next interim.

Thanks,
Chris.


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Subject: [Lsr] On collaboration for abstraction
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Hi,

I=E2=80=99d like to comment on the process for moving forward for the =
abstraction proposals that we are discussing (TTZ, Area proxy, flooding =
reduction, =E2=80=A6).

My understanding of the block on collaboration is that we are prohibited =
from collaborating privately.  We MAY have open, public discussions.

Thus, I would propose that we have more interim meetings to try to =
progress this issue.  To help ensure that these are truly public, I =
believe that the WG chairs should coordinate and moderate these =
meetings.

It is legally important that there be no side discussions. At all.

Thoughts?


Regards,
Tony


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References: <1520992FC97B944A9979C2FC1D7DB0F404DB1AD4@dggeml524-mbx.china.huawei.com> <MW3PR11MB4619361A2CA3A402A44914E5C1FE0@MW3PR11MB4619.namprd11.prod.outlook.com> <1520992FC97B944A9979C2FC1D7DB0F404DB2336@dggeml524-mbx.china.huawei.com> <68249E56-5702-4C15-9748-439E43F3EB0E@chopps.org> <1520992FC97B944A9979C2FC1D7DB0F404DEFC14@dggeml524-mbx.china.huawei.com> <A937FECB-2013-403E-89B2-47971514F6CF@chopps.org> <80a8f83c76d447dda48280495b3a80a7@huawei.com> <6F0E8437-5D82-4FAC-A061-69E56E1E161D@chopps.org> <2189e17f36764960bf2dcc554cde9ce0@huawei.com> <MW3PR11MB4619925BEF83B0C4512DD284C1C90@MW3PR11MB4619.namprd11.prod.outlook.com> <06e8443210924ac788c40fa15972cbdd@huawei.com> <C987B657-64D1-4C70-B471-ED9F1266B990@cisco.com> <3948044C-0CC9-4AE8-8541-4D23A5DF396E@cisco.com> <1520992FC97B944A9979C2FC1D7DB0F404DF089E@dggeml524-mbx.china.huawei.com> <MW3PR11MB46197F8C43B3200B07641838C1C60@MW3PR11MB4619.namprd11.prod.outlook.com> <CAOj+MMGsVkws0sTw4RRdb_SdWvsuh+2Dxc-upXqT2_pmpO_+Lg@mail.gmail.com> <6930807B-2FF0-4A5C-AD39-D05345C37A5E@chopps.org> <MW3PR11MB461955420610E933ACC44BC4C1C60@MW3PR11MB4619.namprd11.prod.outlook.com> <CAOj+MMHoTbDzZrA1ttPsdD5Tk7TADaR=ex5WGF=6+X3X1utoHg@mail.gmail.com> <bd193457-956c-47b0-a50b-8d1778e8349a@Spark> <CAOj+MMGuRHVoJ3ez4nQ3O87J4U+-+yabYWeA1AEfj1UGAbPp7w@mail.gmail.com> <3DFEBF57-427E-425E-B5D2-48F683519D16@chopps.org>
In-Reply-To: <3DFEBF57-427E-425E-B5D2-48F683519D16@chopps.org>
From: Robert Raszuk <robert@raszuk.net>
Date: Fri, 3 Apr 2020 00:09:55 +0200
Message-ID: <CAOj+MMFqoVrWY2K4DJ6_1Kmdu4gv6jwm6c3q_HOTTSCSY7U_3A@mail.gmail.com>
To: Christian Hopps <chopps@chopps.org>
Cc: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>,  Jeff Tantsura <jefftant.ietf@gmail.com>, Tianran Zhou <zhoutianran@huawei.com>, "Acee Lindem (acee)" <acee@cisco.com>, wangyali <wangyali11@huawei.com>
Content-Type: multipart/alternative; boundary="00000000000023ef7e05a25610e3"
Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/P5F-kSplYSFuBzXIooYoUq-ZiFQ>
Subject: Re: [Lsr] problem joining interim [Re: A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02]
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--00000000000023ef7e05a25610e3
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Hi Chris,

I never noticed the password ...

Just few days back I participated in IDR and no password was needed or
perhaps webex invite link contained a token relaxing from needing one.

Cheers,
R.

On Fri, Apr 3, 2020 at 12:00 AM Christian Hopps <chopps@chopps.org> wrote:

>
>
> > On Apr 2, 2020, at 5:17 PM, Robert Raszuk <robert@raszuk.net> wrote:
> >
> > Many thx,
> > R.
> >
> > PS. As we are talking LSR here it is strange that joining virtual LSR
> meeting is not for everyone. I was waiting and tried three times today for
> host approval to join which was not granted.
> >
>
> I am very sorry to hear this! We had 64 participants, at least at one
> point that I saw. I set the meeting up, and I don't believe there is any
> way to exclude anyone in particular, I certainly would never have chosen to
> do that.
>
> However, Webex has a password requirement when setting up meetings (I
> guess, I tried to not have one, it wouldn't let me) which we included in
> all the details wherever the details were posted, it was "linkstate".
>
> I did notice an email, from webex, during the meeting about a request from
> Bruno to join as guest, but he was in the participant list when I then
> checked. I didn't receive any other emails like that (and FWIW I had 5
> windows over 2 monitors going at once trying to manage all this, so
> noticing the 1 email was lucky).
>
> Did it let you skip entering a password (or did it not offer the option in
> the first place)?
>
> It would be good to figure this out before the next interim.
>
> Thanks,
> Chris.
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>

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<div dir=3D"ltr">Hi Chris,<div><br></div><div>I never noticed the password =
...=C2=A0</div><div><br></div><div>Just few days back I participated in IDR=
 and no password=C2=A0was needed or perhaps webex invite link contained a t=
oken relaxing from needing one.=C2=A0</div><div><br></div><div>Cheers,<br>R=
.</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail=
_attr">On Fri, Apr 3, 2020 at 12:00 AM Christian Hopps &lt;<a href=3D"mailt=
o:chopps@chopps.org">chopps@chopps.org</a>&gt; wrote:<br></div><blockquote =
class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px sol=
id rgb(204,204,204);padding-left:1ex"><br>
<br>
&gt; On Apr 2, 2020, at 5:17 PM, Robert Raszuk &lt;<a href=3D"mailto:robert=
@raszuk.net" target=3D"_blank">robert@raszuk.net</a>&gt; wrote:<br>
&gt; <br>
&gt; Many thx,<br>
&gt; R.<br>
&gt; <br>
&gt; PS. As we are talking LSR here it is strange that joining virtual LSR =
meeting is not for everyone. I was waiting and tried three times today for =
host approval to join which was not granted. <br>
&gt; <br>
<br>
I am very sorry to hear this! We had 64 participants, at least at one point=
 that I saw. I set the meeting up, and I don&#39;t believe there is any way=
 to exclude anyone in particular, I certainly would never have chosen to do=
 that.<br>
<br>
However, Webex has a password requirement when setting up meetings (I guess=
, I tried to not have one, it wouldn&#39;t let me) which we included in all=
 the details wherever the details were posted, it was &quot;linkstate&quot;=
.<br>
<br>
I did notice an email, from webex, during the meeting about a request from =
Bruno to join as guest, but he was in the participant list when I then chec=
ked. I didn&#39;t receive any other emails like that (and FWIW I had 5 wind=
ows over 2 monitors going at once trying to manage all this, so noticing th=
e 1 email was lucky).<br>
<br>
Did it let you skip entering a password (or did it not offer the option in =
the first place)?<br>
<br>
It would be good to figure this out before the next interim.<br>
<br>
Thanks,<br>
Chris.<br>
<br>
_______________________________________________<br>
Lsr mailing list<br>
<a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
</blockquote></div>

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From: Robert Raszuk <robert@raszuk.net>
Date: Fri, 3 Apr 2020 00:16:55 +0200
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To: Christian Hopps <chopps@chopps.org>
Cc: Jeff Tantsura <jefftant.ietf@gmail.com>, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>,  "lsr@ietf.org" <lsr@ietf.org>, "Acee Lindem (acee)" <acee@cisco.com>, Tianran Zhou <zhoutianran@huawei.com>, wangyali <wangyali11@huawei.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/Eo-i55GFyDSnuMGgWIh9qK1ilLQ>
Subject: Re: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
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> > If you consider such constrains to provide reachability for applications
> you will likely see value that in-situ telemetry is your friend here.
> Really best friend as without him you can not do the proper end to end path
> exclusion for SPT computations.
>
> [as wg member] Are you thinking that shifting traffic to a router is not
> going to affect it's jitter/drop rate?
>

Well this is actually the other way around.

First you have your default topology. They you are asked to construct new
one based on applied constrains.

So you create complete TE coverage and start running end to end data plane
probing over all TE paths (say SR-TE for specific example). Once you start
collecting the probe results you can start excluding paths which do not
meet your applied constraints. And that process continues.

To your specific question - It is not that unusual where routers degrade
their performance with time and in many cases the traffic is not the cause
for it but internal bugs and malfunctions.

Best,
R.

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<div dir=3D"ltr"><div dir=3D"ltr"><br></div><div class=3D"gmail_quote"><blo=
ckquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left=
:1px solid rgb(204,204,204);padding-left:1ex">&gt; If you consider such con=
strains to provide reachability for applications you will likely see value =
that in-situ telemetry is your friend here. Really best friend as without h=
im you can not do the proper end to end path exclusion for SPT computations=
. <br>
<br>
[as wg member] Are you thinking that shifting traffic to a router is not go=
ing to affect it&#39;s jitter/drop rate?<br></blockquote><div><br></div><di=
v>Well this is actually the other way around.=C2=A0</div><div><br></div><di=
v>First you have your default topology. They you are asked to construct=C2=
=A0new one based on applied constrains.=C2=A0</div><div><br></div><div>So y=
ou create complete TE coverage and start running end to end data plane prob=
ing over all TE paths=C2=A0(say SR-TE for specific=C2=A0example). Once you =
start collecting the probe results you can start excluding=C2=A0paths which=
 do not meet your applied constraints. And that process continues.=C2=A0</d=
iv><div><br></div><div>To your specific question - It is not that unusual w=
here routers degrade their performance=C2=A0with time and in many cases the=
 traffic is not the cause for it but internal bugs and malfunctions.=C2=A0<=
/div><div><br></div><div>Best,<br>R.</div></div></div>

--00000000000033f4f005a25629ed--


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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Robert Raszuk <robert@raszuk.net>, Christian Hopps <chopps@chopps.org>
CC: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>, Jeff Tantsura <jefftant.ietf@gmail.com>, Tianran Zhou <zhoutianran@huawei.com>, wangyali <wangyali11@huawei.com>
Thread-Topic: [Lsr] problem joining interim [Re: A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02]
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Date: Thu, 2 Apr 2020 15:24:18 -0700
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: Robert Raszuk <robert@raszuk.net>
Cc: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>,  "=?utf-8?Q?lsr=40ietf.org?=" <lsr@ietf.org>, Christian Hopps <chopps@chopps.org>, "Acee Lindem (acee)" <acee@cisco.com>, Tianran Zhou <zhoutianran@huawei.com>, wangyali <wangyali11@huawei.com>
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References: <1520992FC97B944A9979C2FC1D7DB0F404DB1AD4@dggeml524-mbx.china.huawei.com> <MW3PR11MB4619361A2CA3A402A44914E5C1FE0@MW3PR11MB4619.namprd11.prod.outlook.com> <1520992FC97B944A9979C2FC1D7DB0F404DB2336@dggeml524-mbx.china.huawei.com> <68249E56-5702-4C15-9748-439E43F3EB0E@chopps.org> <1520992FC97B944A9979C2FC1D7DB0F404DEFC14@dggeml524-mbx.china.huawei.com> <A937FECB-2013-403E-89B2-47971514F6CF@chopps.org> <80a8f83c76d447dda48280495b3a80a7@huawei.com> <6F0E8437-5D82-4FAC-A061-69E56E1E161D@chopps.org> <2189e17f36764960bf2dcc554cde9ce0@huawei.com> <MW3PR11MB4619925BEF83B0C4512DD284C1C90@MW3PR11MB4619.namprd11.prod.outlook.com> <06e8443210924ac788c40fa15972cbdd@huawei.com> <C987B657-64D1-4C70-B471-ED9F1266B990@cisco.com> <3948044C-0CC9-4AE8-8541-4D23A5DF396E@cisco.com> <1520992FC97B944A9979C2FC1D7DB0F404DF089E@dggeml524-mbx.china.huawei.com> <MW3PR11MB46197F8C43B3200B07641838C1C60@MW3PR11MB4619.namprd11.prod.outlook.com> <CAOj+MMGsVkws0sTw4RRdb_SdWvsuh+2Dxc-upXqT2_pmpO_+Lg@mail.gmail.com> <6930807B-2FF0-4A5C-AD39-D05345C37A5E@chopps.org> <MW3PR11MB461955420610E933ACC44BC4C1C60@MW3PR11MB4619.namprd11.prod.outlook.com> <CAOj+MMHoTbDzZrA1ttPsdD5Tk7TADaR=ex5WGF=6+X3X1utoHg@mail.gmail.com> <bd193457-956c-47b0-a50b-8d1778e8349a@Spark> <CAOj+MMGuRHVoJ3ez4nQ3O87J4U+-+yabYWeA1AEfj1UGAbPp7w@mail.gmail.com>
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Subject: Re: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
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Robert,

That is why we have a possibility to signal in-band/as per device data th=
at could be used by PCE to compute a path that meets the constrains (R=46=
C=C2=A07471/7810), e.g per node BW =C2=A0reserved/available=C2=A0or cumul=
ative delay, and similar, computed by the PCE.
However if the=C2=A0objective functions used by CSP=46 are=C2=A0coming fr=
om outside (end2end latency measurement/=24=24 of a link =C2=A0as an exam=
ple) we don=E2=80=99t feed them back into IGP, telemetry analysis (done b=
y an external system) are of no business of IGP and should be fed (normal=
ized) into PCE directly.
We are not discussing the value of telemetry, which is obvious, but need =
to autodiscover telemetry capability=E2=80=99s and feed (pollute) them in=
to IGP->BGP-LS->controller.
I don=E2=80=99t see how this information would be used in route/path comp=
utation and hence IMHO it doesn=E2=80=99t belong in IGP. Given the need f=
or configuration (besides ability to support particular technology) makes=
 this a clear candidate for management plane operations. (Chris=E2=80=99 =
comment about YANG)

Cheers,
Jeff
On Apr 2, 2020, 2:17 PM -0700, Robert Raszuk <robert=40raszuk.net>, wrote=
:
> Jeff.
>
> > The role of a routing protocol is to distribute: reachability (doh :-=
))
> > and any additional data that could influence routing decision wrt rea=
chability.
>
> The bolded text is precisely the point here.
>
> So let me provide a very simple=C2=A0example.
>
> Today routers already compute CSP=46. Moreover today routers are asked =
to use custom/flexible algorithm to choose reachability paths.
>
> So just imagine an operator who says:
>
> Please compute my SPT with the consideration that end to end inband jit=
ter is not greater then=C2=A010 ms otherwise I do not want to see nodes w=
hich do not meet that criteria in the reachability graph for application =
X.
>
> or
>
> Please compute my SPT with the consideration that end to end drop rate =
is not greater then=C2=A0 5pps otherwise I do not want to see nodes which=
 do not meet that criteria in the reachability graph for application Y.
>
> etc ...
>
> If you consider such constrains=C2=A0to provide reachability for applic=
ations you will likely=C2=A0see value that in-situ telemetry is your frie=
nd here. Really best friend as without him you can not do the proper end =
to end path exclusion for SPT computations.
>
> Hint: All per link extensions which were added to IGPs are not going to=
 help here as drops or jitter may equally happen in the routers fabric on=
 fabric to LC boundaries or on the line cards=C2=A0and links. So you need=
 end to end test stream.
>
> Many thx,
> R.
>
> PS. As we are talking LSR here it is strange that joining virtual LSR m=
eeting is not for everyone. I was waiting and tried three times today for=
 host approval to join which was not granted.
>
> > On Thu, Apr 2, 2020 at 11:00 PM Jeff Tantsura <jefftant.ietf=40gmail.=
com> wrote:
> > > Robert,
> > >
> > > This is unnecessary leakage of management plane into control plane.=

> > > The role of a routing protocol is to distribute: reachability (doh =
:-)) and any additional data that could influence routing decision wrt re=
achability.
> > > There are precedences of using IGP=E2=80=99s for different tasks, e=
.g. R=46C 5088 and similar, however should we do it again=3F
> > >
> > > Specifically to use case described - I really don=E2=80=99t see how=
 this information would be used in routing decisions (PCE computation). M=
oreover, if the end-goal is to build a connected graph of the devices tha=
t have a coherent i=46IT feature set it would require reoptimization on e=
very change and quite complex computation logic (talking SR - on top of r=
egular constrains, MSD, etc).I=E2=80=99d also think that there=E2=80=99s =
mandatory configuration of name-spaces and features supported, in other w=
ords - autodiscovery is meaningless, it would still require as per device=
 configuration (hello YANG). Most of telemetry solutions are designed to =
pass thought nodes that don=E2=80=99t support it transparently, so the re=
al requirement is really to know the sink-node (the one that is egress of=
 the telemetry domain and must remove all additional encapsulations).
> > >
> > > As to the last point - we already have a kitchen-sink routing proto=
col =C2=A0;-)
> > >
> > > Cheers,
> > > Jeff
> > > On Apr 2, 2020, 6:10 AM -0700, Robert Raszuk <robert=40raszuk.net>,=
 wrote:
> > > >
> > > > Hi Les,
> > > >
> > > > Ok very well.
> > > >
> > > > So till this draft provides a text or reference to some other doc=
ument how IGPs may use inband telemetry data for real path selection it d=
oes not fit to LSR charter. =46air.
> > > >
> > > > Hi Chris,
> > > >
> > > > I am afraid=C2=A0we are looking at this from completely different=
 perspectives.
> > > >
> > > > I consider=C2=A0this data to be a necessity for routing and you s=
imply treat it as some opaque telemetry. If we would think of it in the l=
atter sense sure you would be right. IGP is not a configuration push prot=
ocol. Sufficient to observe how BGP became one :)
> > > >
> > > > Many=C2=A0thx,
> > > > R.
> > > >
> > > >
> > > > > On Thu, Apr 2, 2020 at 8:46 AM Les Ginsberg (ginsberg) <ginsber=
g=40cisco.com> wrote:
> > > > > > Robert -
> > > > > >
> > > > > > =46irst, +1 to what Chris has said.
> > > > > >
> > > > > > There is nothing in the lfit-capability draft that defines an=
y information that can be used by IGPs to do what you suggest.
> > > > > > Perhaps it is possible that information gleaned via a telemet=
ry application could be used by the IGPs to do something like what you su=
ggest - but this draft is not discussing/defining that. It is simply prop=
osing to advertise information about the capabilities of the lfit applica=
tion on a given node..
> > > > > >
> > > > > > =C2=A0 =C2=A0Les
> > > > > >
> > > > > > > -----Original Message-----
> > > > > > > =46rom: Christian Hopps <chopps=40chopps.org>
> > > > > > > Sent: Thursday, April 02, 2020 5:13 AM
> > > > > > > To: Robert Raszuk <robert=40raszuk.net>
> > > > > > > Cc: Christian Hopps <chopps=40chopps.org>; Les Ginsberg (gi=
nsberg)
> > > > > > > <ginsberg=40cisco.com>; wangyali <wangyali11=40huawei.com>;=
 Acee Lindem
> > > > > > > (acee) <acee=40cisco.com>; lsr=40ietf..org; Tianran Zhou
> > > > > > > <zhoutianran=40huawei.com>
> > > > > > > Subject: Re: =5BLsr=5D A new version of I-D, draft-liu-lsr-=
isis-ifit-node-capability-02
> > > > > > >
> > > > > > > We have defined a perfectly acceptable and quite powerful w=
ay to do query
> > > > > > > and configuration for routers, it's YANG. I'd like to hear =
why the the IET=46
> > > > > > > standard mechanism for query and configuration can't work f=
or this
> > > > > > > application.
> > > > > > >
> > > > > > > Telemetry is important, I don't think anyone has said or wo=
uld say that it isn't,
> > > > > > > but that seems orthogonal to this discussion.
> > > > > > >
> > > > > > > Thanks,
> > > > > > > Chris.
> > > > > > > =5Bas WG member=5D
> > > > > > >
> > > > > > >
> > > > > > > > On Apr 2, 2020, at 5:17 AM, Robert Raszuk <robert=40raszu=
k.net> wrote:
> > > > > > > >
> > > > > > > > Hi Les,
> > > > > > > >
> > > > > > > > I would like to respectfully disagree with your assessmen=
t.
> > > > > > > >
> > > > > > > > The fact that today's IGP (or for that matter BGP) routin=
g is static from the
> > > > > > > perspective of not taking into consideration real performan=
ce measurements
> > > > > > > from the data plane to me is a bug not a feature.
> > > > > > > >
> > > > > > > > Building SPT based on static link metrics which in vast m=
ajority of cases
> > > > > > > today are emulated circuits on someone else IP backbone. It=
 was a great idea
> > > > > > > when you constructed the network with connection oriented p=
aradigm
> > > > > > > (Sonet,SDH, dark fiber, TDM ...) not connection less often =
best effort one.
> > > > > > > >
> > > > > > > > So I find this proposal very useful and would vote for ad=
opting it in LSR WG.
> > > > > > > To me in-situ telemetry is not just some monitoring tool. I=
t is an extremely
> > > > > > > important element to influence how we compute reachability =
or at least how
> > > > > > > we choose active forwarding paths from protocol RIBs to mai=
n RIB.
> > > > > > > >
> > > > > > > > If we extended IGPs to carry TE information, if we extend=
ed them to
> > > > > > > enable flexible algorithm based path computation I fail to =
understand why
> > > > > > > would we resist to natively enable all of the above with ge=
tting the inputs
> > > > > > > from real networks to be used as to the parameters to the a=
bove mentioned
> > > > > > > tools.
> > > > > > > >
> > > > > > > > Kind regards,
> > > > > > > > R.
> > > > > > > >
> > > > > > > > On Thu, Apr 2, 2020 at 8:32 AM Les Ginsberg (ginsberg)
> > > > > > > <ginsberg=3D40cisco.com=40dmarc.ietf.org> wrote:
> > > > > > > > Yali -
> > > > > > > >
> > > > > > > > There is a very significant difference between having IGP=
s advertise an
> > > > > > > identifier for a service that they use as clients (B=46D) a=
nd having IGPs
> > > > > > > advertise a set of capabilities/options for a telemetry app=
lication which has
> > > > > > > no direct bearing on the function of the routing protocol.
> > > > > > > >
> > > > > > > > You are not the first to find using IGPs to flood applica=
tion information very
> > > > > > > convenient.=C2=A0 But this is not the appropriate role for =
the IGPs and over the
> > > > > > > years we have consistently resisted attempts to do so.
> > > > > > > >
> > > > > > > > Everything advertised in Router Capabilities today has so=
me close
> > > > > > > relationship with the operation of the protocol. Do some of=
 the existing
> > > > > > > advertisements =22bend the rules=22 a bit more than I would=
 prefer=3F Yes - but
> > > > > > > there has always been at least a close relationship to rout=
ing protocol
> > > > > > > function.
> > > > > > > > Here there is none.
> > > > > > > >
> > > > > > > > If you feel compelled to use IGPs to advertise applicatio=
n information, you
> > > > > > > have R=466823 available (at least for IS-IS). But it is a =22=
high bar=22 since it requires
> > > > > > > you also to use a separate IS-IS instance dedicated to adve=
rtising the
> > > > > > > application information (see R=46C8202).
> > > > > > > > I think Chris Hopps's suggestion to use Netconf/YANG to c=
onfigure/retrieve
> > > > > > > what you need is most likely more attractive - but I will l=
eave that for you to
> > > > > > > decide.
> > > > > > > >
> > > > > > > > Using IGP Router Capabilities here is wrong in my view.
> > > > > > > >
> > > > > > > >=C2=A0 =C2=A0 Les
> > > > > > > >
> > > > > > > >
> > > > > > > > > -----Original Message-----
> > > > > > > > > =46rom: wangyali <wangyali11=40huawei.com>
> > > > > > > > > Sent: Wednesday, April 01, 2020 8:12 PM
> > > > > > > > > To: Acee Lindem (acee) <acee=40cisco.com>; Les Ginsberg=
 (ginsberg)
> > > > > > > > > <ginsberg=40cisco.com>; Christian Hopps <chopps=40chopp=
s.org>
> > > > > > > > > Cc: lsr=40ietf.org; Tianran Zhou <zhoutianran=40huawei.=
com>
> > > > > > > > > Subject: =E7=AD=94=E5=A4=8D: =5BLsr=5D A new version of=
 I-D, draft-liu-lsr-isis-ifit-node-
> > > > > > > capability-
> > > > > > > > > 02
> > > > > > > > >
> > > > > > > > > Hi Acee, Chris and Les,
> > > > > > > > >
> > > > > > > > > This is Yali. Many thanks for your kind comments and su=
ggestion.
> > > > > > > > >
> > > > > > > > > Besides of signaling MSD by IGP node CAPABILITY TLV, we=
 learned that
> > > > > > > > > there's another R=46C7883 that advertising S-B=46D disc=
riminators in IS-IS. In
> > > > > > > my
> > > > > > > > > understand, B=46D is a protocol to detect faults in the=
 bidirectional path
> > > > > > > > > between two forwarding engines, including interface, da=
ta links, etc.
> > > > > > > > >
> > > > > > > > > Similarly, I=46IT provides a complete framework of a fa=
mily of on-path
> > > > > > > > > telemetry techniques, which are used to monitoring perf=
ormance metrics
> > > > > > > of
> > > > > > > > > service flows, e.g. packet loss, delay. So we consider =
there's a same
> > > > > > > > > methodology with S-B=46D that advertising I=46IT node c=
apabilities.
> > > > > > > > >
> > > > > > > > > Please let us know your comments and opinion. Thanks.
> > > > > > > > >
> > > > > > > > > Best regards,
> > > > > > > > > Yali
> > > > > > > > >
> > > > > > > > > -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
> > > > > > > > > =E5=8F=91=E4=BB=B6=E4=BA=BA: Acee Lindem (acee) =5Bmail=
to:acee=40cisco.com=5D
> > > > > > > > > =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B44=E6=
=9C=881=E6=97=A5 20:29
> > > > > > > > > =E6=94=B6=E4=BB=B6=E4=BA=BA: Tianran Zhou <zhoutianran=40=
huawei.com>; Les Ginsberg
> > > > > > > (ginsberg)
> > > > > > > > > <ginsberg=40cisco.com>; Christian Hopps <chopps=40chopp=
s.org>
> > > > > > > > > =E6=8A=84=E9=80=81: lsr=40ietf.org; wangyali <wangyali1=
1=40huawei.com>
> > > > > > > > > =E4=B8=BB=E9=A2=98: Re: =5BLsr=5D A new version of I-D,=
 draft-liu-lsr-isis-ifit-node-capability-
> > > > > > > 02
> > > > > > > > >
> > > > > > > > > Speak as WG Member...
> > > > > > > > >
> > > > > > > > > On 4/1/20, 8:08 AM, =22Acee Lindem (acee)=22 <acee=40ci=
sco.com> wrote:
> > > > > > > > >
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0There is also a difference between s=
ome of the existing applications
> > > > > > > > > advertised in IGP capabilities. =46or example, MSD is u=
sed with the routing
> > > > > > > > > information to construct SR paths. The information for =
all these OAM
> > > > > > > > > mechanisms doesn't share this affinity. Also, it seems =
like a slippery slope
> > > > > > > in
> > > > > > > > > what is needed for each of the mechanism.
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0Thanks,
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0Acee
> > > > > > > > >
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0On 4/1/20, 4:01 AM, =22Lsr on behalf=
 of Tianran Zhou=22 <lsr-
> > > > > > > bounces=40ietf.org
> > > > > > > > > on behalf of zhoutianran=40huawei.com> wrote:
> > > > > > > > >
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hi Les,
> > > > > > > > >
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Thanks very much for y=
our suggestion. I have a quick look at rfc6823.
> > > > > > > > > Sounds like a good idea. I will think about it.
> > > > > > > > >
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Cheers,
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Tianran
> > > > > > > > >
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0-----Original Message-=
----
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=46rom: Les Ginsberg (=
ginsberg) =5Bmailto:ginsberg=40cisco.com=5D
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Sent: Wednesday, April=
 1, 2020 1:47 PM
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0To: Tianran Zhou <zhou=
tianran=40huawei.com>; Christian Hopps
> > > > > > > > > <chopps=40chopps.org>
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Cc: wangyali <wangyali=
11=40huawei.com>; lsr=40ietf.org
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Subject: RE: =5BLsr=5D=
 A new version of I-D, draft-liu-lsr-isis-ifit-node-
> > > > > > > > > capability-02
> > > > > > > > >
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Tianran -
> > > > > > > > >
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0I am very much in agre=
ement with the points Chris has made.
> > > > > > > > >
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0IGPs do not exist to a=
dvertise capabilities/configure applications -
> > > > > > > which
> > > > > > > > > seems to me to be what you are proposing here.
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0The fact that you can =
easily define the encodings does not make it
> > > > > > > the
> > > > > > > > > right thing to do.
> > > > > > > > >
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0This issue was discuss=
ed at length in the context of
> > > > > > > > > https://tools.ietf.org/html/rfc6823 . If you were propo=
sing to use
> > > > > > > GENAPP I
> > > > > > > > > would not object - though I do think Chris has correctl=
y pointed out that
> > > > > > > > > NETCON=46/YANG is likely a more appropriate solution fo=
r your use case.
> > > > > > > > >
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Les
> > > > > > > > >
> > > > > > > > >
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> -----Original Messag=
e-----
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> =46rom: Tianran Zhou=
 <zhoutianran=40huawei.com>
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> Sent: Tuesday, March=
 31, 2020 7:53 PM
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> To: Christian Hopps =
<chopps=40chopps.org>
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> Cc: wangyali <wangya=
li11=40huawei.com>; Les Ginsberg (ginsberg)
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> <ginsberg=40cisco.co=
m>; lsr=40ietf.org
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> Subject: RE: =5BLsr=5D=
 A new version of I-D,
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> draft-liu-lsr-isis-i=
fit-node-capability-02
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> Hi Chris,
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> Thanks for your quic=
k reply, and please see inline.
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> Cheers,
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> Tianran
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> -----Original Messag=
e-----
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> =46rom: Christian Ho=
pps =5Bmailto:chopps=40chopps.org=5D
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> Sent: Wednesday, Apr=
il 1, 2020 10:00 AM
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> To: Tianran Zhou <zh=
outianran=40huawei.com>
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> Cc: Christian Hopps =
<chopps=40chopps.org>; wangyali
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> <wangyali11=40huawei=
.com>; Les Ginsberg (ginsberg)
> > > > > > > > > <ginsberg=40cisco.com>;
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> lsr=40ietf.org
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> Subject: Re: =5BLsr=5D=
 A new version of I-D,
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> draft-liu-lsr-isis-i=
fit-node-capability-02
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> > On Mar 31, 2020, a=
t 9:28 PM, Tianran Zhou
> > > > > > > > > <zhoutianran=40huawei.com>
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> wrote:
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> >
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> > ZTR> Let's not boi=
l the ocean to compare NETCON=46/YANG or
> > > > > > > routing
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> protocol, which is b=
etter. But I did not see the modification to
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> routing protocol wit=
h some TLVs is a heavy work, or more complex
> > > > > > > than
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> NETCON=46/YANG.=C2=A0=
 I see both are available and useful.
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> I'm not sure what yo=
u mean by boiling the ocean. I'm saying that
> > > > > > > YANG
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> is built and intende=
d for querying capabilities and configuring
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> routers. Why isn't t=
hat where you are looking first for configuring
> > > > > > > your
> > > > > > > > > monitoring application=3F
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> ZTR> I know NETCON=46=
 can do both query and configuration. And I
> > > > > > > > > know
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> resent YANG-Push imp=
rovements to reduce the polling.=C2=A0 But
> > > > > > > routing
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> protocol solutions a=
re also widely used for this. There are already
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> many R=46Cs and impl=
ementation practices. We considered both
> > > > > > > ways,
> > > > > > > > > and
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> aimed for different =
scenarios.
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> You don't see the ma=
jor difference between writing a YANG model
> > > > > > > vs
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> modifying all of the=
 standard IET=46 routing protocols=3F
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> ZTR> I know many dif=
ferences between NETCON=46 and routing
> > > > > > > > > protocol.
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> There are many detai=
ls on both interfaces, implementations,
> > > > > > > scenarios
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> when comparing them.=
 That's what I mean boil the ocean.
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> Here I do not know w=
hat's the =22major difference=22 you mean=3F
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0>
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> Thanks,
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0> Chris.
> > > > > > > > >
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Lsr mailing list
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Lsr=40ietf.org
> > > > > > > > >=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0https://www..ietf.org/=
mailman/listinfo/lsr
> > > > > > > > >
> > > > > > > > >
> > > > > > > > >
> > > > > > > >
> > > > > > > > =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F
> > > > > > > > Lsr mailing list
> > > > > > > > Lsr=40ietf.org
> > > > > > > > https://www.ietf.org/mailman/listinfo/lsr
> > > > > >
> > > > =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=

> > > > Lsr mailing list
> > > > Lsr=40ietf.org
> > > > https://www.ietf.org/mailman/listinfo/lsr

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<div name=3D=22messageBodySection=22>
<div dir=3D=22auto=22>Robert,
<div dir=3D=22auto=22><br /></div>
<div dir=3D=22auto=22>That is why we have a possibility to signal in-band=
/as per device data that could be used by PCE to compute a path that meet=
s the constrains (R=46C&=23160;<span style=3D=22background-color: var(--b=
ackgroundColor);=22><span style=3D=22color: var(--textColor);=22>7471/781=
0), e.g per node BW &=23160;reserved/</span>available<span style=3D=22col=
or: var(--textColor);=22>&=23160;or cumulative delay, and similar, comput=
ed by the PCE.</span></span></div>
<div dir=3D=22auto=22><span style=3D=22background-color: var(--background=
Color);=22><span style=3D=22color: var(--textColor);=22>However if the&=23=
160;</span>objective functions used by CSP=46 are<span style=3D=22color: =
var(--textColor);=22>&=23160;coming from outside (end2end latency measure=
ment/=24=24 of a link &=23160;as an example) we don=E2=80=99t feed them b=
ack into IGP, telemetry analysis (done by an external system) are of no b=
usiness of IGP and should be fed (normalized) into PCE directly.&=23160;<=
/span></span></div>
<div dir=3D=22auto=22><span style=3D=22background-color: var(--background=
Color);=22><span style=3D=22color: var(--textColor);=22>We are not discus=
sing the value of telemetry, which is obvious, but need to autodiscover t=
elemetry capability=E2=80=99s and feed (</span>pollute) them into IGP-&gt=
;BGP-LS-&gt;controller.</span></div>
<div dir=3D=22auto=22><span style=3D=22background-color: var(--background=
Color);=22><span style=3D=22color: var(--textColor);=22>I don=E2=80=99t s=
ee how this information would be used in route/path computation and hence=
 IMHO it doesn=E2=80=99t belong in IGP. Given the need for configuration =
(besides ability to support particular technology) makes this a clear can=
didate for management plane operations. (Chris=E2=80=99 comment about YAN=
G)</span></span></div>
</div>
</div>
<div name=3D=22messageSignatureSection=22><br />
<div class=3D=22match=46ont=22>Cheers,
<div>Jeff</div>
</div>
</div>
<div name=3D=22messageReplySection=22>On Apr 2, 2020, 2:17 PM -0700, Robe=
rt Raszuk &lt;robert=40raszuk.net&gt;, wrote:<br />
<blockquote type=3D=22cite=22 class=3D=22spark=5Fquote=22 style=3D=22marg=
in: 5px 5px; padding-left: 10px; border-left: thin solid =231abc9c;=22>
<div dir=3D=22ltr=22>Jeff.
<div><br /></div>
<div>&gt; The role of a routing protocol is to distribute: reachability (=
doh :-))&=23160;</div>
<div>&gt; <b>and any additional data that could influence routing decisio=
n wrt reachability.&=23160;&=23160;</b><br /></div>
<div><b><br /></b></div>
<div>The bolded text is precisely the point here.&=23160;</div>
<div><br /></div>
<div>So let me provide a very simple&=23160;example.&=23160;</div>
<div><br /></div>
<div>Today routers already compute CSP=46. Moreover today routers are ask=
ed to use custom/flexible algorithm to choose reachability paths.&=23160;=
</div>
<div><br /></div>
<div>So just imagine an operator who says:&=23160;</div>
<div><br /></div>
<div>Please compute my SPT with the consideration that end to end inband =
jitter is not greater then&=23160;10 ms otherwise I do not want to see no=
des which do not meet that criteria in the reachability graph for applica=
tion X.</div>
<div><br /></div>
<div>or&=23160;</div>
<div><br /></div>
<div>Please compute my SPT with the consideration that end to end drop ra=
te is not greater then&=23160; 5pps otherwise I do not want to see nodes =
which do not meet that criteria in the reachability graph for application=
 Y.&=23160;</div>
<div><br /></div>
<div>etc ...&=23160;</div>
<div><br /></div>
<div>If you consider such constrains&=23160;to provide reachability for a=
pplications you will likely&=23160;see value that in-situ telemetry is yo=
ur friend here. Really best friend as without him you can not do the prop=
er end to end path exclusion for SPT computations.&=23160;<br /></div>
<div><br /></div>
<div>Hint: All per link extensions which were added to IGPs are not going=
 to help here as drops or jitter may equally happen in the routers fabric=
 on fabric to LC boundaries or on the line cards&=23160;and links. So you=
 need end to end test stream.&=23160;</div>
<div><br /></div>
<div>Many thx,</div>
<div>R.</div>
<div><br /></div>
<div>PS. As we are talking LSR here it is strange that joining virtual LS=
R meeting is not for everyone. I was waiting and tried three times today =
for host approval to join which was not granted.&=23160;</div>
</div>
<br />
<div class=3D=22gmail=5Fquote=22>
<div dir=3D=22ltr=22 class=3D=22gmail=5Fattr=22>On Thu, Apr 2, 2020 at 11=
:00 PM Jeff Tantsura &lt;<a href=3D=22mailto:jefftant.ietf=40gmail.com=22=
>jefftant.ietf=40gmail.com</a>&gt; wrote:<br /></div>
<blockquote class=3D=22gmail=5Fquote spark=5Fquote=22 style=3D=22margin: =
5px 5px; padding-left: 10px; border-left: thin solid =23e67e22;=22>
<div>
<div name=3D=22messageBodySection=22>
<div dir=3D=22auto=22>Robert,
<div dir=3D=22auto=22><br /></div>
<div dir=3D=22auto=22>This is unnecessary leakage of management plane int=
o control plane.</div>
<div dir=3D=22auto=22>The role of a routing protocol is to distribute: re=
achability (doh :-)) and any additional data that could influence routing=
 decision wrt reachability.</div>
<div dir=3D=22auto=22>There are precedences of using IGP=E2=80=99s for di=
fferent tasks, e.g. R=46C 5088 and similar, however should we do it again=
=3F</div>
<div dir=3D=22auto=22><br /></div>
<div dir=3D=22auto=22>Specifically to use case described - I really don=E2=
=80=99t see how this information would be used in routing decisions (PCE =
computation). Moreover, if the end-goal is to build a connected graph of =
the devices that have a coherent i=46IT feature set it would require reop=
timization on every change and quite complex computation logic (talking S=
R - on top of regular constrains, MSD, etc).I=E2=80=99d also think that t=
here=E2=80=99s mandatory configuration of name-spaces and features suppor=
ted, in other words - autodiscovery is meaningless, it would still requir=
e as per device configuration (hello YANG). Most of telemetry solutions a=
re designed to pass thought nodes that don=E2=80=99t support it transpare=
ntly, so the real requirement is really to know the sink-node (the one th=
at is egress of the telemetry domain and must remove all additional encap=
sulations).&=23160;</div>
<div dir=3D=22auto=22><br /></div>
<div dir=3D=22auto=22>As to the last point - we already have a kitchen-si=
nk routing protocol &=23160;;-)</div>
</div>
</div>
<div name=3D=22messageSignatureSection=22><br />
<div>Cheers,
<div>Jeff</div>
</div>
</div>
<div name=3D=22messageReplySection=22>On Apr 2, 2020, 6:10 AM -0700, Robe=
rt Raszuk &lt;<a href=3D=22mailto:robert=40raszuk.net=22 target=3D=22=5Fb=
lank=22>robert=40raszuk.net</a>&gt;, wrote:<br />
<blockquote type=3D=22cite=22 style=3D=22margin: 5px 5px; padding-left: 1=
0px; border-left: thin solid =233498db;=22 class=3D=22spark=5Fquote=22>
<div dir=3D=22ltr=22>
<div><br /></div>
<div>Hi Les,</div>
<div><br /></div>
Ok very well.&=23160;
<div><br /></div>
<div>So till this draft provides a text or reference to some other docume=
nt how IGPs may use inband telemetry data for real path selection it does=
 not fit to LSR charter. =46air.&=23160;</div>
<div><br /></div>
<div>Hi Chris,</div>
<div><br /></div>
<div>I am afraid&=23160;we are looking at this from completely different =
perspectives.&=23160;</div>
<div><br /></div>
<div>I consider&=23160;this data to be a necessity for routing and you si=
mply treat it as some opaque telemetry. If we would think of it in the la=
tter sense sure you would be right. IGP is not a configuration push proto=
col. Sufficient to observe how BGP became one :)&=23160;</div>
<div><br /></div>
<div>Many&=23160;thx,</div>
<div>R.</div>
<div><br /></div>
</div>
<br />
<div class=3D=22gmail=5Fquote=22>
<div dir=3D=22ltr=22 class=3D=22gmail=5Fattr=22>On Thu, Apr 2, 2020 at 8:=
46 AM Les Ginsberg (ginsberg) &lt;<a href=3D=22mailto:ginsberg=40cisco.co=
m=22 target=3D=22=5Fblank=22>ginsberg=40cisco.com</a>&gt; wrote:<br /></d=
iv>
<blockquote class=3D=22gmail=5Fquote spark=5Fquote=22 style=3D=22margin: =
5px 5px; padding-left: 10px; border-left: thin solid =23d35400;=22>Robert=
 -<br />
<br />
=46irst, +1 to what Chris has said.<br />
<br />
There is nothing in the lfit-capability draft that defines any informatio=
n that can be used by IGPs to do what you suggest.<br />
Perhaps it is possible that information gleaned via a telemetry applicati=
on could be used by the IGPs to do something like what you suggest - but =
this draft is not discussing/defining that. It is simply proposing to adv=
ertise information about the capabilities of the lfit application on a gi=
ven node..<br />
<br />
&=23160; &=23160;Les<br />
<br />
&gt; -----Original Message-----<br />
&gt; =46rom: Christian Hopps &lt;<a href=3D=22mailto:chopps=40chopps.org=22=
 target=3D=22=5Fblank=22>chopps=40chopps.org</a>&gt;<br />
&gt; Sent: Thursday, April 02, 2020 5:13 AM<br />
&gt; To: Robert Raszuk &lt;<a href=3D=22mailto:robert=40raszuk.net=22 tar=
get=3D=22=5Fblank=22>robert=40raszuk.net</a>&gt;<br />
&gt; Cc: Christian Hopps &lt;<a href=3D=22mailto:chopps=40chopps.org=22 t=
arget=3D=22=5Fblank=22>chopps=40chopps.org</a>&gt;; Les Ginsberg (ginsber=
g)<br />
&gt; &lt;<a href=3D=22mailto:ginsberg=40cisco.com=22 target=3D=22=5Fblank=
=22>ginsberg=40cisco.com</a>&gt;; wangyali &lt;<a href=3D=22mailto:wangya=
li11=40huawei.com=22 target=3D=22=5Fblank=22>wangyali11=40huawei.com</a>&=
gt;; Acee Lindem<br />
&gt; (acee) &lt;<a href=3D=22mailto:acee=40cisco.com=22 target=3D=22=5Fbl=
ank=22>acee=40cisco.com</a>&gt;; <a href=3D=22mailto:lsr=40ietf.org=22 ta=
rget=3D=22=5Fblank=22>lsr=40ietf..org</a>; Tianran Zhou<br />
&gt; &lt;<a href=3D=22mailto:zhoutianran=40huawei.com=22 target=3D=22=5Fb=
lank=22>zhoutianran=40huawei.com</a>&gt;<br />
&gt; Subject: Re: =5BLsr=5D A new version of I-D, draft-liu-lsr-isis-ifit=
-node-capability-02<br />
&gt;<br />
&gt; We have defined a perfectly acceptable and quite powerful way to do =
query<br />
&gt; and configuration for routers, it's YANG. I'd like to hear why the t=
he IET=46<br />
&gt; standard mechanism for query and configuration can't work for this<b=
r />
&gt; application.<br />
&gt;<br />
&gt; Telemetry is important, I don't think anyone has said or would say t=
hat it isn't,<br />
&gt; but that seems orthogonal to this discussion.<br />
&gt;<br />
&gt; Thanks,<br />
&gt; Chris.<br />
&gt; =5Bas WG member=5D<br />
&gt;<br />
&gt;<br />
&gt; &gt; On Apr 2, 2020, at 5:17 AM, Robert Raszuk &lt;<a href=3D=22mail=
to:robert=40raszuk.net=22 target=3D=22=5Fblank=22>robert=40raszuk.net</a>=
&gt; wrote:<br />
&gt; &gt;<br />
&gt; &gt; Hi Les,<br />
&gt; &gt;<br />
&gt; &gt; I would like to respectfully disagree with your assessment.<br =
/>
&gt; &gt;<br />
&gt; &gt; The fact that today's IGP (or for that matter BGP) routing is s=
tatic from the<br />
&gt; perspective of not taking into consideration real performance measur=
ements<br />
&gt; from the data plane to me is a bug not a feature.<br />
&gt; &gt;<br />
&gt; &gt; Building SPT based on static link metrics which in vast majorit=
y of cases<br />
&gt; today are emulated circuits on someone else IP backbone. It was a gr=
eat idea<br />
&gt; when you constructed the network with connection oriented paradigm<b=
r />
&gt; (Sonet,SDH, dark fiber, TDM ...) not connection less often best effo=
rt one.<br />
&gt; &gt;<br />
&gt; &gt; So I find this proposal very useful and would vote for adopting=
 it in LSR WG.<br />
&gt; To me in-situ telemetry is not just some monitoring tool. It is an e=
xtremely<br />
&gt; important element to influence how we compute reachability or at lea=
st how<br />
&gt; we choose active forwarding paths from protocol RIBs to main RIB.<br=
 />
&gt; &gt;<br />
&gt; &gt; If we extended IGPs to carry TE information, if we extended the=
m to<br />
&gt; enable flexible algorithm based path computation I fail to understan=
d why<br />
&gt; would we resist to natively enable all of the above with getting the=
 inputs<br />
&gt; from real networks to be used as to the parameters to the above ment=
ioned<br />
&gt; tools.<br />
&gt; &gt;<br />
&gt; &gt; Kind regards,<br />
&gt; &gt; R.<br />
&gt; &gt;<br />
&gt; &gt; On Thu, Apr 2, 2020 at 8:32 AM Les Ginsberg (ginsberg)<br />
&gt; &lt;ginsberg=3D<a href=3D=22mailto:40cisco.com=40dmarc.ietf.org=22 t=
arget=3D=22=5Fblank=22>40cisco.com=40dmarc.ietf.org</a>&gt; wrote:<br />
&gt; &gt; Yali -<br />
&gt; &gt;<br />
&gt; &gt; There is a very significant difference between having IGPs adve=
rtise an<br />
&gt; identifier for a service that they use as clients (B=46D) and having=
 IGPs<br />
&gt; advertise a set of capabilities/options for a telemetry application =
which has<br />
&gt; no direct bearing on the function of the routing protocol.<br />
&gt; &gt;<br />
&gt; &gt; You are not the first to find using IGPs to flood application i=
nformation very<br />
&gt; convenient.&=23160; But this is not the appropriate role for the IGP=
s and over the<br />
&gt; years we have consistently resisted attempts to do so.<br />
&gt; &gt;<br />
&gt; &gt; Everything advertised in Router Capabilities today has some clo=
se<br />
&gt; relationship with the operation of the protocol. Do some of the exis=
ting<br />
&gt; advertisements =22bend the rules=22 a bit more than I would prefer=3F=
 Yes - but<br />
&gt; there has always been at least a close relationship to routing proto=
col<br />
&gt; function.<br />
&gt; &gt; Here there is none.<br />
&gt; &gt;<br />
&gt; &gt; If you feel compelled to use IGPs to advertise application info=
rmation, you<br />
&gt; have R=466823 available (at least for IS-IS). But it is a =22high ba=
r=22 since it requires<br />
&gt; you also to use a separate IS-IS instance dedicated to advertising t=
he<br />
&gt; application information (see R=46C8202).<br />
&gt; &gt; I think Chris Hopps's suggestion to use Netconf/YANG to configu=
re/retrieve<br />
&gt; what you need is most likely more attractive - but I will leave that=
 for you to<br />
&gt; decide.<br />
&gt; &gt;<br />
&gt; &gt; Using IGP Router Capabilities here is wrong in my view.<br />
&gt; &gt;<br />
&gt; &gt;&=23160; &=23160; Les<br />
&gt; &gt;<br />
&gt; &gt;<br />
&gt; &gt; &gt; -----Original Message-----<br />
&gt; &gt; &gt; =46rom: wangyali &lt;<a href=3D=22mailto:wangyali11=40huaw=
ei.com=22 target=3D=22=5Fblank=22>wangyali11=40huawei.com</a>&gt;<br />
&gt; &gt; &gt; Sent: Wednesday, April 01, 2020 8:12 PM<br />
&gt; &gt; &gt; To: Acee Lindem (acee) &lt;<a href=3D=22mailto:acee=40cisc=
o.com=22 target=3D=22=5Fblank=22>acee=40cisco.com</a>&gt;; Les Ginsberg (=
ginsberg)<br />
&gt; &gt; &gt; &lt;<a href=3D=22mailto:ginsberg=40cisco.com=22 target=3D=22=
=5Fblank=22>ginsberg=40cisco.com</a>&gt;; Christian Hopps &lt;<a href=3D=22=
mailto:chopps=40chopps.org=22 target=3D=22=5Fblank=22>chopps=40chopps.org=
</a>&gt;<br />
&gt; &gt; &gt; Cc: <a href=3D=22mailto:lsr=40ietf.org=22 target=3D=22=5Fb=
lank=22>lsr=40ietf.org</a>; Tianran Zhou &lt;<a href=3D=22mailto:zhoutian=
ran=40huawei.com=22 target=3D=22=5Fblank=22>zhoutianran=40huawei.com</a>&=
gt;<br />
&gt; &gt; &gt; Subject: =E7=AD=94=E5=A4=8D: =5BLsr=5D A new version of I-=
D, draft-liu-lsr-isis-ifit-node-<br />
&gt; capability-<br />
&gt; &gt; &gt; 02<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt; Hi Acee, Chris and Les,<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt; This is Yali. Many thanks for your kind comments and sugge=
stion.<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt; Besides of signaling MSD by IGP node CAPABILITY TLV, we le=
arned that<br />
&gt; &gt; &gt; there's another R=46C7883 that advertising S-B=46D discrim=
inators in IS-IS. In<br />
&gt; my<br />
&gt; &gt; &gt; understand, B=46D is a protocol to detect faults in the bi=
directional path<br />
&gt; &gt; &gt; between two forwarding engines, including interface, data =
links, etc.<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt; Similarly, I=46IT provides a complete framework of a famil=
y of on-path<br />
&gt; &gt; &gt; telemetry techniques, which are used to monitoring perform=
ance metrics<br />
&gt; of<br />
&gt; &gt; &gt; service flows, e.g. packet loss, delay. So we consider the=
re's a same<br />
&gt; &gt; &gt; methodology with S-B=46D that advertising I=46IT node capa=
bilities.<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt; Please let us know your comments and opinion. Thanks.<br /=
>
&gt; &gt; &gt;<br />
&gt; &gt; &gt; Best regards,<br />
&gt; &gt; &gt; Yali<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt; -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----<br />
&gt; &gt; &gt; =E5=8F=91=E4=BB=B6=E4=BA=BA: Acee Lindem (acee) =5Bmailto:=
<a href=3D=22mailto:acee=40cisco.com=22 target=3D=22=5Fblank=22>acee=40ci=
sco.com</a>=5D<br />
&gt; &gt; &gt; =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B44=E6=9C=
=881=E6=97=A5 20:29<br />
&gt; &gt; &gt; =E6=94=B6=E4=BB=B6=E4=BA=BA: Tianran Zhou &lt;<a href=3D=22=
mailto:zhoutianran=40huawei.com=22 target=3D=22=5Fblank=22>zhoutianran=40=
huawei.com</a>&gt;; Les Ginsberg<br />
&gt; (ginsberg)<br />
&gt; &gt; &gt; &lt;<a href=3D=22mailto:ginsberg=40cisco.com=22 target=3D=22=
=5Fblank=22>ginsberg=40cisco.com</a>&gt;; Christian Hopps &lt;<a href=3D=22=
mailto:chopps=40chopps.org=22 target=3D=22=5Fblank=22>chopps=40chopps.org=
</a>&gt;<br />
&gt; &gt; &gt; =E6=8A=84=E9=80=81: <a href=3D=22mailto:lsr=40ietf.org=22 =
target=3D=22=5Fblank=22>lsr=40ietf.org</a>; wangyali &lt;<a href=3D=22mai=
lto:wangyali11=40huawei.com=22 target=3D=22=5Fblank=22>wangyali11=40huawe=
i.com</a>&gt;<br />
&gt; &gt; &gt; =E4=B8=BB=E9=A2=98: Re: =5BLsr=5D A new version of I-D, dr=
aft-liu-lsr-isis-ifit-node-capability-<br />
&gt; 02<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt; Speak as WG Member...<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt; =EF=BB=BFOn 4/1/20, 8:08 AM, =22Acee Lindem (acee)=22 &lt;=
<a href=3D=22mailto:acee=40cisco.com=22 target=3D=22=5Fblank=22>acee=40ci=
sco.com</a>&gt; wrote:<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160;There is also a difference betwee=
n some of the existing applications<br />
&gt; &gt; &gt; advertised in IGP capabilities. =46or example, MSD is used=
 with the routing<br />
&gt; &gt; &gt; information to construct SR paths. The information for all=
 these OAM<br />
&gt; &gt; &gt; mechanisms doesn't share this affinity. Also, it seems lik=
e a slippery slope<br />
&gt; in<br />
&gt; &gt; &gt; what is needed for each of the mechanism.<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160;Thanks,<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160;Acee<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160;On 4/1/20, 4:01 AM, =22Lsr on beh=
alf of Tianran Zhou=22 &lt;lsr-<br />
&gt; <a href=3D=22mailto:bounces=40ietf.org=22 target=3D=22=5Fblank=22>bo=
unces=40ietf.org</a><br />
&gt; &gt; &gt; on behalf of <a href=3D=22mailto:zhoutianran=40huawei.com=22=
 target=3D=22=5Fblank=22>zhoutianran=40huawei.com</a>&gt; wrote:<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;Hi Les,<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;Thanks very muc=
h for your suggestion. I have a quick look at rfc6823.<br />
&gt; &gt; &gt; Sounds like a good idea. I will think about it.<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;Cheers,<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;Tianran<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;-----Original M=
essage-----<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;=46rom: Les Gin=
sberg (ginsberg) =5Bmailto:<a href=3D=22mailto:ginsberg=40cisco.com=22 ta=
rget=3D=22=5Fblank=22>ginsberg=40cisco.com</a>=5D<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;Sent: Wednesday=
, April 1, 2020 1:47 PM<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;To: Tianran Zho=
u &lt;<a href=3D=22mailto:zhoutianran=40huawei.com=22 target=3D=22=5Fblan=
k=22>zhoutianran=40huawei.com</a>&gt;; Christian Hopps<br />
&gt; &gt; &gt; &lt;<a href=3D=22mailto:chopps=40chopps.org=22 target=3D=22=
=5Fblank=22>chopps=40chopps.org</a>&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;Cc: wangyali &l=
t;<a href=3D=22mailto:wangyali11=40huawei.com=22 target=3D=22=5Fblank=22>=
wangyali11=40huawei.com</a>&gt;; <a href=3D=22mailto:lsr=40ietf.org=22 ta=
rget=3D=22=5Fblank=22>lsr=40ietf.org</a><br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;Subject: RE: =5B=
Lsr=5D A new version of I-D, draft-liu-lsr-isis-ifit-node-<br />
&gt; &gt; &gt; capability-02<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;Tianran -<br />=

&gt; &gt; &gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;I am very much =
in agreement with the points Chris has made.<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;IGPs do not exi=
st to advertise capabilities/configure applications -<br />
&gt; which<br />
&gt; &gt; &gt; seems to me to be what you are proposing here.<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;The fact that y=
ou can easily define the encodings does not make it<br />
&gt; the<br />
&gt; &gt; &gt; right thing to do.<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;This issue was =
discussed at length in the context of<br />
&gt; &gt; &gt; <a href=3D=22https://tools.ietf.org/html/rfc6823=22 rel=3D=
=22noreferrer=22 target=3D=22=5Fblank=22>https://tools.ietf.org/html/rfc6=
823</a> . If you were proposing to use<br />
&gt; GENAPP I<br />
&gt; &gt; &gt; would not object - though I do think Chris has correctly p=
ointed out that<br />
&gt; &gt; &gt; NETCON=46/YANG is likely a more appropriate solution for y=
our use case.<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160; &=23160; Les<b=
r />
&gt; &gt; &gt;<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; -----Origi=
nal Message-----<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; =46rom: Ti=
anran Zhou &lt;<a href=3D=22mailto:zhoutianran=40huawei.com=22 target=3D=22=
=5Fblank=22>zhoutianran=40huawei.com</a>&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; Sent: Tues=
day, March 31, 2020 7:53 PM<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; To: Christ=
ian Hopps &lt;<a href=3D=22mailto:chopps=40chopps.org=22 target=3D=22=5Fb=
lank=22>chopps=40chopps.org</a>&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; Cc: wangya=
li &lt;<a href=3D=22mailto:wangyali11=40huawei.com=22 target=3D=22=5Fblan=
k=22>wangyali11=40huawei.com</a>&gt;; Les Ginsberg (ginsberg)<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; &lt;<a hre=
f=3D=22mailto:ginsberg=40cisco.com=22 target=3D=22=5Fblank=22>ginsberg=40=
cisco.com</a>&gt;; <a href=3D=22mailto:lsr=40ietf.org=22 target=3D=22=5Fb=
lank=22>lsr=40ietf.org</a><br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; Subject: R=
E: =5BLsr=5D A new version of I-D,<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; draft-liu-=
lsr-isis-ifit-node-capability-02<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; Hi Chris,<=
br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; Thanks for=
 your quick reply, and please see inline.<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; Cheers,<br=
 />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; Tianran<br=
 />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; -----Origi=
nal Message-----<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; =46rom: Ch=
ristian Hopps =5Bmailto:<a href=3D=22mailto:chopps=40chopps.org=22 target=
=3D=22=5Fblank=22>chopps=40chopps.org</a>=5D<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; Sent: Wedn=
esday, April 1, 2020 10:00 AM<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; To: Tianra=
n Zhou &lt;<a href=3D=22mailto:zhoutianran=40huawei.com=22 target=3D=22=5F=
blank=22>zhoutianran=40huawei.com</a>&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; Cc: Christ=
ian Hopps &lt;<a href=3D=22mailto:chopps=40chopps.org=22 target=3D=22=5Fb=
lank=22>chopps=40chopps.org</a>&gt;; wangyali<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; &lt;<a hre=
f=3D=22mailto:wangyali11=40huawei.com=22 target=3D=22=5Fblank=22>wangyali=
11=40huawei.com</a>&gt;; Les Ginsberg (ginsberg)<br />
&gt; &gt; &gt; &lt;<a href=3D=22mailto:ginsberg=40cisco.com=22 target=3D=22=
=5Fblank=22>ginsberg=40cisco.com</a>&gt;;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; <a href=3D=
=22mailto:lsr=40ietf.org=22 target=3D=22=5Fblank=22>lsr=40ietf.org</a><br=
 />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; Subject: R=
e: =5BLsr=5D A new version of I-D,<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; draft-liu-=
lsr-isis-ifit-node-capability-02<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; &gt; On Ma=
r 31, 2020, at 9:28 PM, Tianran Zhou<br />
&gt; &gt; &gt; &lt;<a href=3D=22mailto:zhoutianran=40huawei.com=22 target=
=3D=22=5Fblank=22>zhoutianran=40huawei.com</a>&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; wrote:<br =
/>
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; &gt;<br />=

&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; &gt; ZTR&g=
t; Let's not boil the ocean to compare NETCON=46/YANG or<br />
&gt; routing<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; protocol, =
which is better. But I did not see the modification to<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; routing pr=
otocol with some TLVs is a heavy work, or more complex<br />
&gt; than<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; NETCON=46/=
YANG.&=23160; I see both are available and useful.<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; I'm not su=
re what you mean by boiling the ocean. I'm saying that<br />
&gt; YANG<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; is built a=
nd intended for querying capabilities and configuring<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; routers. W=
hy isn't that where you are looking first for configuring<br />
&gt; your<br />
&gt; &gt; &gt; monitoring application=3F<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; ZTR&gt; I =
know NETCON=46 can do both query and configuration. And I<br />
&gt; &gt; &gt; know<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; resent YAN=
G-Push improvements to reduce the polling.&=23160; But<br />
&gt; routing<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; protocol s=
olutions are also widely used for this. There are already<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; many R=46C=
s and implementation practices. We considered both<br />
&gt; ways,<br />
&gt; &gt; &gt; and<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; aimed for =
different scenarios.<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; You don't =
see the major difference between writing a YANG model<br />
&gt; vs<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; modifying =
all of the standard IET=46 routing protocols=3F<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; ZTR&gt; I =
know many differences between NETCON=46 and routing<br />
&gt; &gt; &gt; protocol.<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; There are =
many details on both interfaces, implementations,<br />
&gt; scenarios<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; when compa=
ring them. That's what I mean boil the ocean.<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; Here I do =
not know what's the =22major difference=22 you mean=3F<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; Thanks,<br=
 />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;&gt; Chris.<br =
/>
&gt; &gt; &gt;<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;Lsr mailing lis=
t<br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;<a href=3D=22ma=
ilto:Lsr=40ietf.org=22 target=3D=22=5Fblank=22>Lsr=40ietf.org</a><br />
&gt; &gt; &gt;&=23160; &=23160; &=23160; &=23160; &=23160;<a href=3D=22ht=
tps://www.ietf..org/mailman/listinfo/lsr=22 rel=3D=22noreferrer=22 target=
=3D=22=5Fblank=22>https://www..ietf.org/mailman/listinfo/lsr</a><br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt;<br />
&gt; &gt; &gt;<br />
&gt; &gt;<br />
&gt; &gt; =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F<br />
&gt; &gt; Lsr mailing list<br />
&gt; &gt; <a href=3D=22mailto:Lsr=40ietf.org=22 target=3D=22=5Fblank=22>L=
sr=40ietf.org</a><br />
&gt; &gt; <a href=3D=22https://www.ietf.org/mailman/listinfo/lsr=22 rel=3D=
=22noreferrer=22 target=3D=22=5Fblank=22>https://www.ietf.org/mailman/lis=
tinfo/lsr</a><br />
<br /></blockquote>
</div>
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F<br />
Lsr mailing list<br />
<a href=3D=22mailto:Lsr=40ietf.org=22 target=3D=22=5Fblank=22>Lsr=40ietf.=
org</a><br />
<a href=3D=22https://www.ietf.org/mailman/listinfo/lsr=22 target=3D=22=5F=
blank=22>https://www.ietf.org/mailman/listinfo/lsr</a><br /></blockquote>=

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References: <1520992FC97B944A9979C2FC1D7DB0F404DB1AD4@dggeml524-mbx.china.huawei.com> <MW3PR11MB4619361A2CA3A402A44914E5C1FE0@MW3PR11MB4619.namprd11.prod.outlook.com> <1520992FC97B944A9979C2FC1D7DB0F404DB2336@dggeml524-mbx.china.huawei.com> <68249E56-5702-4C15-9748-439E43F3EB0E@chopps.org> <1520992FC97B944A9979C2FC1D7DB0F404DEFC14@dggeml524-mbx.china.huawei.com> <A937FECB-2013-403E-89B2-47971514F6CF@chopps.org> <80a8f83c76d447dda48280495b3a80a7@huawei.com> <6F0E8437-5D82-4FAC-A061-69E56E1E161D@chopps.org> <2189e17f36764960bf2dcc554cde9ce0@huawei.com> <MW3PR11MB4619925BEF83B0C4512DD284C1C90@MW3PR11MB4619.namprd11.prod.outlook.com> <06e8443210924ac788c40fa15972cbdd@huawei.com> <C987B657-64D1-4C70-B471-ED9F1266B990@cisco.com> <3948044C-0CC9-4AE8-8541-4D23A5DF396E@cisco.com> <1520992FC97B944A9979C2FC1D7DB0F404DF089E@dggeml524-mbx.china.huawei.com> <MW3PR11MB46197F8C43B3200B07641838C1C60@MW3PR11MB4619.namprd11.prod.outlook.com> <CAOj+MMGsVkws0sTw4RRdb_SdWvsuh+2Dxc-upXqT2_pmpO_+Lg@mail.gmail.com> <6930807B-2FF0-4A5C-AD39-D05345C37A5E@chopps.org> <MW3PR11MB461955420610E933ACC44BC4C1C60@MW3PR11MB4619.namprd11.prod.outlook.com> <CAOj+MMHoTbDzZrA1ttPsdD5Tk7TADaR=ex5WGF=6+X3X1utoHg@mail.gmail.com> <bd193457-956c-47b0-a50b-8d1778e8349a@Spark> <CAOj+MMGuRHVoJ3ez4nQ3O87J4U+-+yabYWeA1AEfj1UGAbPp7w@mail.gmail.com> <ee3b1b98-8c64-47f7-b023-20fb47b696c8@Spark>
In-Reply-To: <ee3b1b98-8c64-47f7-b023-20fb47b696c8@Spark>
From: Robert Raszuk <robert@raszuk.net>
Date: Fri, 3 Apr 2020 00:28:49 +0200
Message-ID: <CAOj+MMHVFLMHWoHQ6-r9AyeJpYyNnv6mB121tmDUNY8SDQnNyA@mail.gmail.com>
To: Jeff Tantsura <jefftant.ietf@gmail.com>
Cc: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>,  Christian Hopps <chopps@chopps.org>, "Acee Lindem (acee)" <acee@cisco.com>,  Tianran Zhou <zhoutianran@huawei.com>, wangyali <wangyali11@huawei.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/sAgnCGT4UUT_zh1O1EYN9GFLE88>
Subject: Re: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
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Well Jeff if you would completely remove CSPF and Flex Algo from IGPs I am
fully with you.

But till we still have them running in the routers I am of the opinion that
we need both ... bigger and slower PCE based path computation and
sufficient information (not only static data) for routers itself to be able
to adjust forwarding state based on the live path constraints.

I realize I am thinking outside of the box here but hopefully one day this
will become a norm rather then abstraction :)

Best,
R.,

On Fri, Apr 3, 2020 at 12:24 AM Jeff Tantsura <jefftant.ietf@gmail.com>
wrote:

> Robert,
>
> That is why we have a possibility to signal in-band/as per device data
> that could be used by PCE to compute a path that meets the constrains (RF=
C 7471/7810),
> e.g per node BW  reserved/available or cumulative delay, and similar,
> computed by the PCE.
> However if the objective functions used by CSPF are coming from outside
> (end2end latency measurement/$$ of a link  as an example) we don=E2=80=99=
t feed
> them back into IGP, telemetry analysis (done by an external system) are o=
f
> no business of IGP and should be fed (normalized) into PCE directly.
> We are not discussing the value of telemetry, which is obvious, but need
> to autodiscover telemetry capability=E2=80=99s and feed (pollute) them in=
to
> IGP->BGP-LS->controller.
> I don=E2=80=99t see how this information would be used in route/path comp=
utation
> and hence IMHO it doesn=E2=80=99t belong in IGP. Given the need for confi=
guration
> (besides ability to support particular technology) makes this a clear
> candidate for management plane operations. (Chris=E2=80=99 comment about =
YANG)
>
> Cheers,
> Jeff
> On Apr 2, 2020, 2:17 PM -0700, Robert Raszuk <robert@raszuk.net>, wrote:
>
> Jeff.
>
> > The role of a routing protocol is to distribute: reachability (doh :-))
> > *and any additional data that could influence routing decision wrt
> reachability.  *
>
> The bolded text is precisely the point here.
>
> So let me provide a very simple example.
>
> Today routers already compute CSPF. Moreover today routers are asked to
> use custom/flexible algorithm to choose reachability paths.
>
> So just imagine an operator who says:
>
> Please compute my SPT with the consideration that end to end inband jitte=
r
> is not greater then 10 ms otherwise I do not want to see nodes which do n=
ot
> meet that criteria in the reachability graph for application X.
>
> or
>
> Please compute my SPT with the consideration that end to end drop rate is
> not greater then  5pps otherwise I do not want to see nodes which do not
> meet that criteria in the reachability graph for application Y.
>
> etc ...
>
> If you consider such constrains to provide reachability for applications
> you will likely see value that in-situ telemetry is your friend here.
> Really best friend as without him you can not do the proper end to end pa=
th
> exclusion for SPT computations.
>
> Hint: All per link extensions which were added to IGPs are not going to
> help here as drops or jitter may equally happen in the routers fabric on
> fabric to LC boundaries or on the line cards and links. So you need end t=
o
> end test stream.
>
> Many thx,
> R.
>
> PS. As we are talking LSR here it is strange that joining virtual LSR
> meeting is not for everyone. I was waiting and tried three times today fo=
r
> host approval to join which was not granted.
>
> On Thu, Apr 2, 2020 at 11:00 PM Jeff Tantsura <jefftant.ietf@gmail.com>
> wrote:
>
>> Robert,
>>
>> This is unnecessary leakage of management plane into control plane.
>> The role of a routing protocol is to distribute: reachability (doh :-))
>> and any additional data that could influence routing decision wrt
>> reachability.
>> There are precedences of using IGP=E2=80=99s for different tasks, e.g. R=
FC 5088
>> and similar, however should we do it again?
>>
>> Specifically to use case described - I really don=E2=80=99t see how this
>> information would be used in routing decisions (PCE computation). Moreov=
er,
>> if the end-goal is to build a connected graph of the devices that have a
>> coherent iFIT feature set it would require reoptimization on every chang=
e
>> and quite complex computation logic (talking SR - on top of regular
>> constrains, MSD, etc).I=E2=80=99d also think that there=E2=80=99s mandat=
ory configuration
>> of name-spaces and features supported, in other words - autodiscovery is
>> meaningless, it would still require as per device configuration (hello
>> YANG). Most of telemetry solutions are designed to pass thought nodes th=
at
>> don=E2=80=99t support it transparently, so the real requirement is reall=
y to know
>> the sink-node (the one that is egress of the telemetry domain and must
>> remove all additional encapsulations).
>>
>> As to the last point - we already have a kitchen-sink routing protocol
>>  ;-)
>>
>> Cheers,
>> Jeff
>> On Apr 2, 2020, 6:10 AM -0700, Robert Raszuk <robert@raszuk.net>, wrote:
>>
>>
>> Hi Les,
>>
>> Ok very well.
>>
>> So till this draft provides a text or reference to some other document
>> how IGPs may use inband telemetry data for real path selection it does n=
ot
>> fit to LSR charter. Fair.
>>
>> Hi Chris,
>>
>> I am afraid we are looking at this from completely different
>> perspectives.
>>
>> I consider this data to be a necessity for routing and you simply treat
>> it as some opaque telemetry. If we would think of it in the latter sense
>> sure you would be right. IGP is not a configuration push protocol.
>> Sufficient to observe how BGP became one :)
>>
>> Many thx,
>> R.
>>
>>
>> On Thu, Apr 2, 2020 at 8:46 AM Les Ginsberg (ginsberg) <
>> ginsberg@cisco.com> wrote:
>>
>>> Robert -
>>>
>>> First, +1 to what Chris has said.
>>>
>>> There is nothing in the lfit-capability draft that defines any
>>> information that can be used by IGPs to do what you suggest.
>>> Perhaps it is possible that information gleaned via a telemetry
>>> application could be used by the IGPs to do something like what you sug=
gest
>>> - but this draft is not discussing/defining that. It is simply proposin=
g to
>>> advertise information about the capabilities of the lfit application on=
 a
>>> given node..
>>>
>>>    Les
>>>
>>> > -----Original Message-----
>>> > From: Christian Hopps <chopps@chopps.org>
>>> > Sent: Thursday, April 02, 2020 5:13 AM
>>> > To: Robert Raszuk <robert@raszuk.net>
>>> > Cc: Christian Hopps <chopps@chopps.org>; Les Ginsberg (ginsberg)
>>> > <ginsberg@cisco.com>; wangyali <wangyali11@huawei.com>; Acee Lindem
>>> > (acee) <acee@cisco.com>; lsr@ietf..org <lsr@ietf.org>; Tianran Zhou
>>> > <zhoutianran@huawei.com>
>>> > Subject: Re: [Lsr] A new version of I-D,
>>> draft-liu-lsr-isis-ifit-node-capability-02
>>> >
>>> > We have defined a perfectly acceptable and quite powerful way to do
>>> query
>>> > and configuration for routers, it's YANG. I'd like to hear why the th=
e
>>> IETF
>>> > standard mechanism for query and configuration can't work for this
>>> > application.
>>> >
>>> > Telemetry is important, I don't think anyone has said or would say
>>> that it isn't,
>>> > but that seems orthogonal to this discussion.
>>> >
>>> > Thanks,
>>> > Chris.
>>> > [as WG member]
>>> >
>>> >
>>> > > On Apr 2, 2020, at 5:17 AM, Robert Raszuk <robert@raszuk.net> wrote=
:
>>> > >
>>> > > Hi Les,
>>> > >
>>> > > I would like to respectfully disagree with your assessment.
>>> > >
>>> > > The fact that today's IGP (or for that matter BGP) routing is stati=
c
>>> from the
>>> > perspective of not taking into consideration real performance
>>> measurements
>>> > from the data plane to me is a bug not a feature.
>>> > >
>>> > > Building SPT based on static link metrics which in vast majority of
>>> cases
>>> > today are emulated circuits on someone else IP backbone. It was a
>>> great idea
>>> > when you constructed the network with connection oriented paradigm
>>> > (Sonet,SDH, dark fiber, TDM ...) not connection less often best effor=
t
>>> one.
>>> > >
>>> > > So I find this proposal very useful and would vote for adopting it
>>> in LSR WG.
>>> > To me in-situ telemetry is not just some monitoring tool. It is an
>>> extremely
>>> > important element to influence how we compute reachability or at leas=
t
>>> how
>>> > we choose active forwarding paths from protocol RIBs to main RIB.
>>> > >
>>> > > If we extended IGPs to carry TE information, if we extended them to
>>> > enable flexible algorithm based path computation I fail to understand
>>> why
>>> > would we resist to natively enable all of the above with getting the
>>> inputs
>>> > from real networks to be used as to the parameters to the above
>>> mentioned
>>> > tools.
>>> > >
>>> > > Kind regards,
>>> > > R.
>>> > >
>>> > > On Thu, Apr 2, 2020 at 8:32 AM Les Ginsberg (ginsberg)
>>> > <ginsberg=3D40cisco.com@dmarc.ietf.org> wrote:
>>> > > Yali -
>>> > >
>>> > > There is a very significant difference between having IGPs advertis=
e
>>> an
>>> > identifier for a service that they use as clients (BFD) and having IG=
Ps
>>> > advertise a set of capabilities/options for a telemetry application
>>> which has
>>> > no direct bearing on the function of the routing protocol.
>>> > >
>>> > > You are not the first to find using IGPs to flood application
>>> information very
>>> > convenient.  But this is not the appropriate role for the IGPs and
>>> over the
>>> > years we have consistently resisted attempts to do so.
>>> > >
>>> > > Everything advertised in Router Capabilities today has some close
>>> > relationship with the operation of the protocol. Do some of the
>>> existing
>>> > advertisements "bend the rules" a bit more than I would prefer? Yes -
>>> but
>>> > there has always been at least a close relationship to routing protoc=
ol
>>> > function.
>>> > > Here there is none.
>>> > >
>>> > > If you feel compelled to use IGPs to advertise application
>>> information, you
>>> > have RF6823 available (at least for IS-IS). But it is a "high bar"
>>> since it requires
>>> > you also to use a separate IS-IS instance dedicated to advertising th=
e
>>> > application information (see RFC8202).
>>> > > I think Chris Hopps's suggestion to use Netconf/YANG to
>>> configure/retrieve
>>> > what you need is most likely more attractive - but I will leave that
>>> for you to
>>> > decide.
>>> > >
>>> > > Using IGP Router Capabilities here is wrong in my view.
>>> > >
>>> > >    Les
>>> > >
>>> > >
>>> > > > -----Original Message-----
>>> > > > From: wangyali <wangyali11@huawei.com>
>>> > > > Sent: Wednesday, April 01, 2020 8:12 PM
>>> > > > To: Acee Lindem (acee) <acee@cisco.com>; Les Ginsberg (ginsberg)
>>> > > > <ginsberg@cisco.com>; Christian Hopps <chopps@chopps.org>
>>> > > > Cc: lsr@ietf.org; Tianran Zhou <zhoutianran@huawei.com>
>>> > > > Subject: =E7=AD=94=E5=A4=8D: [Lsr] A new version of I-D,
>>> draft-liu-lsr-isis-ifit-node-
>>> > capability-
>>> > > > 02
>>> > > >
>>> > > > Hi Acee, Chris and Les,
>>> > > >
>>> > > > This is Yali. Many thanks for your kind comments and suggestion.
>>> > > >
>>> > > > Besides of signaling MSD by IGP node CAPABILITY TLV, we learned
>>> that
>>> > > > there's another RFC7883 that advertising S-BFD discriminators in
>>> IS-IS. In
>>> > my
>>> > > > understand, BFD is a protocol to detect faults in the
>>> bidirectional path
>>> > > > between two forwarding engines, including interface, data links,
>>> etc.
>>> > > >
>>> > > > Similarly, IFIT provides a complete framework of a family of
>>> on-path
>>> > > > telemetry techniques, which are used to monitoring performance
>>> metrics
>>> > of
>>> > > > service flows, e.g. packet loss, delay. So we consider there's a
>>> same
>>> > > > methodology with S-BFD that advertising IFIT node capabilities.
>>> > > >
>>> > > > Please let us know your comments and opinion. Thanks.
>>> > > >
>>> > > > Best regards,
>>> > > > Yali
>>> > > >
>>> > > > -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
>>> > > > =E5=8F=91=E4=BB=B6=E4=BA=BA: Acee Lindem (acee) [mailto:acee@cisc=
o.com]
>>> > > > =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B44=E6=9C=881=E6=
=97=A5 20:29
>>> > > > =E6=94=B6=E4=BB=B6=E4=BA=BA: Tianran Zhou <zhoutianran@huawei.com=
>; Les Ginsberg
>>> > (ginsberg)
>>> > > > <ginsberg@cisco.com>; Christian Hopps <chopps@chopps.org>
>>> > > > =E6=8A=84=E9=80=81: lsr@ietf.org; wangyali <wangyali11@huawei.com=
>
>>> > > > =E4=B8=BB=E9=A2=98: Re: [Lsr] A new version of I-D,
>>> draft-liu-lsr-isis-ifit-node-capability-
>>> > 02
>>> > > >
>>> > > > Speak as WG Member...
>>> > > >
>>> > > > =EF=BB=BFOn 4/1/20, 8:08 AM, "Acee Lindem (acee)" <acee@cisco.com=
> wrote:
>>> > > >
>>> > > >     There is also a difference between some of the existing
>>> applications
>>> > > > advertised in IGP capabilities. For example, MSD is used with the
>>> routing
>>> > > > information to construct SR paths. The information for all these
>>> OAM
>>> > > > mechanisms doesn't share this affinity. Also, it seems like a
>>> slippery slope
>>> > in
>>> > > > what is needed for each of the mechanism.
>>> > > >     Thanks,
>>> > > >     Acee
>>> > > >
>>> > > >     On 4/1/20, 4:01 AM, "Lsr on behalf of Tianran Zhou" <lsr-
>>> > bounces@ietf.org
>>> > > > on behalf of zhoutianran@huawei.com> wrote:
>>> > > >
>>> > > >         Hi Les,
>>> > > >
>>> > > >         Thanks very much for your suggestion. I have a quick look
>>> at rfc6823.
>>> > > > Sounds like a good idea. I will think about it.
>>> > > >
>>> > > >         Cheers,
>>> > > >         Tianran
>>> > > >
>>> > > >         -----Original Message-----
>>> > > >         From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]
>>> > > >         Sent: Wednesday, April 1, 2020 1:47 PM
>>> > > >         To: Tianran Zhou <zhoutianran@huawei.com>; Christian Hopp=
s
>>> > > > <chopps@chopps.org>
>>> > > >         Cc: wangyali <wangyali11@huawei.com>; lsr@ietf.org
>>> > > >         Subject: RE: [Lsr] A new version of I-D,
>>> draft-liu-lsr-isis-ifit-node-
>>> > > > capability-02
>>> > > >
>>> > > >         Tianran -
>>> > > >
>>> > > >         I am very much in agreement with the points Chris has mad=
e.
>>> > > >
>>> > > >         IGPs do not exist to advertise capabilities/configure
>>> applications -
>>> > which
>>> > > > seems to me to be what you are proposing here.
>>> > > >         The fact that you can easily define the encodings does no=
t
>>> make it
>>> > the
>>> > > > right thing to do.
>>> > > >
>>> > > >         This issue was discussed at length in the context of
>>> > > > https://tools.ietf.org/html/rfc6823 . If you were proposing to us=
e
>>> > GENAPP I
>>> > > > would not object - though I do think Chris has correctly pointed
>>> out that
>>> > > > NETCONF/YANG is likely a more appropriate solution for your use
>>> case.
>>> > > >
>>> > > >            Les
>>> > > >
>>> > > >
>>> > > >         > -----Original Message-----
>>> > > >         > From: Tianran Zhou <zhoutianran@huawei.com>
>>> > > >         > Sent: Tuesday, March 31, 2020 7:53 PM
>>> > > >         > To: Christian Hopps <chopps@chopps.org>
>>> > > >         > Cc: wangyali <wangyali11@huawei.com>; Les Ginsberg
>>> (ginsberg)
>>> > > >         > <ginsberg@cisco.com>; lsr@ietf.org
>>> > > >         > Subject: RE: [Lsr] A new version of I-D,
>>> > > >         > draft-liu-lsr-isis-ifit-node-capability-02
>>> > > >         >
>>> > > >         > Hi Chris,
>>> > > >         > Thanks for your quick reply, and please see inline.
>>> > > >         >
>>> > > >         > Cheers,
>>> > > >         > Tianran
>>> > > >         >
>>> > > >         > -----Original Message-----
>>> > > >         > From: Christian Hopps [mailto:chopps@chopps.org]
>>> > > >         > Sent: Wednesday, April 1, 2020 10:00 AM
>>> > > >         > To: Tianran Zhou <zhoutianran@huawei.com>
>>> > > >         > Cc: Christian Hopps <chopps@chopps.org>; wangyali
>>> > > >         > <wangyali11@huawei.com>; Les Ginsberg (ginsberg)
>>> > > > <ginsberg@cisco.com>;
>>> > > >         > lsr@ietf.org
>>> > > >         > Subject: Re: [Lsr] A new version of I-D,
>>> > > >         > draft-liu-lsr-isis-ifit-node-capability-02
>>> > > >         >
>>> > > >         >
>>> > > >         >
>>> > > >         > > On Mar 31, 2020, at 9:28 PM, Tianran Zhou
>>> > > > <zhoutianran@huawei.com>
>>> > > >         > wrote:
>>> > > >         > >
>>> > > >         > > ZTR> Let's not boil the ocean to compare NETCONF/YANG
>>> or
>>> > routing
>>> > > >         > protocol, which is better. But I did not see the
>>> modification to
>>> > > >         > routing protocol with some TLVs is a heavy work, or mor=
e
>>> complex
>>> > than
>>> > > >         > NETCONF/YANG.  I see both are available and useful.
>>> > > >         >
>>> > > >         > I'm not sure what you mean by boiling the ocean. I'm
>>> saying that
>>> > YANG
>>> > > >         > is built and intended for querying capabilities and
>>> configuring
>>> > > >         > routers. Why isn't that where you are looking first for
>>> configuring
>>> > your
>>> > > > monitoring application?
>>> > > >         >
>>> > > >         > ZTR> I know NETCONF can do both query and configuration=
.
>>> And I
>>> > > > know
>>> > > >         > resent YANG-Push improvements to reduce the polling.  B=
ut
>>> > routing
>>> > > >         > protocol solutions are also widely used for this. There
>>> are already
>>> > > >         > many RFCs and implementation practices. We considered
>>> both
>>> > ways,
>>> > > > and
>>> > > >         > aimed for different scenarios.
>>> > > >         >
>>> > > >         > You don't see the major difference between writing a
>>> YANG model
>>> > vs
>>> > > >         > modifying all of the standard IETF routing protocols?
>>> > > >         >
>>> > > >         > ZTR> I know many differences between NETCONF and routin=
g
>>> > > > protocol.
>>> > > >         > There are many details on both interfaces,
>>> implementations,
>>> > scenarios
>>> > > >         > when comparing them. That's what I mean boil the ocean.
>>> > > >         > Here I do not know what's the "major difference" you
>>> mean?
>>> > > >         >
>>> > > >         > Thanks,
>>> > > >         > Chris.
>>> > > >
>>> > > >         _______________________________________________
>>> > > >         Lsr mailing list
>>> > > >         Lsr@ietf.org
>>> > > >         https://www..ietf.org/mailman/listinfo/lsr
>>> <https://www.ietf..org/mailman/listinfo/lsr>
>>> > > >
>>> > > >
>>> > > >
>>> > >
>>> > > _______________________________________________
>>> > > Lsr mailing list
>>> > > Lsr@ietf.org
>>> > > https://www.ietf.org/mailman/listinfo/lsr
>>>
>>> _______________________________________________
>> Lsr mailing list
>> Lsr@ietf.org
>> https://www.ietf.org/mailman/listinfo/lsr
>>
>>

--000000000000ab5e6105a2565340
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Well Jeff if you would completely remove CSPF and Flex Alg=
o from IGPs I am fully with you.=C2=A0<div><br></div><div>But till we still=
 have them running in the routers I am of the opinion that we need both ...=
 bigger and slower PCE=C2=A0based path computation and sufficient informati=
on (not only static data) for routers itself to be able to adjust forwardin=
g state based on the live path constraints.=C2=A0</div><div><br></div><div>=
I realize I am thinking outside of the box here but hopefully one day this =
will become a norm rather then abstraction :)</div><div><br></div><div>Best=
,<br>R.,</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=
=3D"gmail_attr">On Fri, Apr 3, 2020 at 12:24 AM Jeff Tantsura &lt;<a href=
=3D"mailto:jefftant.ietf@gmail.com">jefftant.ietf@gmail.com</a>&gt; wrote:<=
br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8e=
x;border-left:1px solid rgb(204,204,204);padding-left:1ex">



<div>
<div name=3D"messageBodySection">
<div dir=3D"auto">Robert,
<div dir=3D"auto"><br></div>
<div dir=3D"auto">That is why we have a possibility to signal in-band/as pe=
r device data that could be used by PCE to compute a path that meets the co=
nstrains (RFC=C2=A0<span><span>7471/7810), e.g per node BW =C2=A0reserved/<=
/span>available<span>=C2=A0or cumulative delay, and similar, computed by th=
e PCE.</span></span></div>
<div dir=3D"auto"><span><span>However if the=C2=A0</span>objective function=
s used by CSPF are<span>=C2=A0coming from outside (end2end latency measurem=
ent/$$ of a link =C2=A0as an example) we don=E2=80=99t feed them back into =
IGP, telemetry analysis (done by an external system) are of no business of =
IGP and should be fed (normalized) into PCE directly.=C2=A0</span></span></=
div>
<div dir=3D"auto"><span><span>We are not discussing the value of telemetry,=
 which is obvious, but need to autodiscover telemetry capability=E2=80=99s =
and feed (</span>pollute) them into IGP-&gt;BGP-LS-&gt;controller.</span></=
div>
<div dir=3D"auto"><span><span>I don=E2=80=99t see how this information woul=
d be used in route/path computation and hence IMHO it doesn=E2=80=99t belon=
g in IGP. Given the need for configuration (besides ability to support part=
icular technology) makes this a clear candidate for management plane operat=
ions. (Chris=E2=80=99 comment about YANG)</span></span></div>
</div>
</div>
<div name=3D"messageSignatureSection"><br>
<div>Cheers,
<div>Jeff</div>
</div>
</div>
<div name=3D"messageReplySection">On Apr 2, 2020, 2:17 PM -0700, Robert Ras=
zuk &lt;<a href=3D"mailto:robert@raszuk.net" target=3D"_blank">robert@raszu=
k.net</a>&gt;, wrote:<br>
<blockquote type=3D"cite" style=3D"margin:5px;padding-left:10px;border-left=
:thin solid rgb(26,188,156)">
<div dir=3D"ltr">Jeff.
<div><br></div>
<div>&gt; The role of a routing protocol is to distribute: reachability (do=
h :-))=C2=A0</div>
<div>&gt; <b>and any additional data that could influence routing decision =
wrt reachability.=C2=A0=C2=A0</b><br></div>
<div><b><br></b></div>
<div>The bolded text is precisely the point here.=C2=A0</div>
<div><br></div>
<div>So let me provide a very simple=C2=A0example.=C2=A0</div>
<div><br></div>
<div>Today routers already compute CSPF. Moreover today routers are asked t=
o use custom/flexible algorithm to choose reachability paths.=C2=A0</div>
<div><br></div>
<div>So just imagine an operator who says:=C2=A0</div>
<div><br></div>
<div>Please compute my SPT with the consideration that end to end inband ji=
tter is not greater then=C2=A010 ms otherwise I do not want to see nodes wh=
ich do not meet that criteria in the reachability graph for application X.<=
/div>
<div><br></div>
<div>or=C2=A0</div>
<div><br></div>
<div>Please compute my SPT with the consideration that end to end drop rate=
 is not greater then=C2=A0 5pps otherwise I do not want to see nodes which =
do not meet that criteria in the reachability graph for application Y.=C2=
=A0</div>
<div><br></div>
<div>etc ...=C2=A0</div>
<div><br></div>
<div>If you consider such constrains=C2=A0to provide reachability for appli=
cations you will likely=C2=A0see value that in-situ telemetry is your frien=
d here. Really best friend as without him you can not do the proper end to =
end path exclusion for SPT computations.=C2=A0<br></div>
<div><br></div>
<div>Hint: All per link extensions which were added to IGPs are not going t=
o help here as drops or jitter may equally happen in the routers fabric on =
fabric to LC boundaries or on the line cards=C2=A0and links. So you need en=
d to end test stream.=C2=A0</div>
<div><br></div>
<div>Many thx,</div>
<div>R.</div>
<div><br></div>
<div>PS. As we are talking LSR here it is strange that joining virtual LSR =
meeting is not for everyone. I was waiting and tried three times today for =
host approval to join which was not granted.=C2=A0</div>
</div>
<br>
<div class=3D"gmail_quote">
<div dir=3D"ltr" class=3D"gmail_attr">On Thu, Apr 2, 2020 at 11:00 PM Jeff =
Tantsura &lt;<a href=3D"mailto:jefftant.ietf@gmail.com" target=3D"_blank">j=
efftant.ietf@gmail.com</a>&gt; wrote:<br></div>
<blockquote class=3D"gmail_quote" style=3D"margin:5px;padding-left:10px;bor=
der-left:thin solid rgb(230,126,34)">
<div>
<div name=3D"messageBodySection">
<div dir=3D"auto">Robert,
<div dir=3D"auto"><br></div>
<div dir=3D"auto">This is unnecessary leakage of management plane into cont=
rol plane.</div>
<div dir=3D"auto">The role of a routing protocol is to distribute: reachabi=
lity (doh :-)) and any additional data that could influence routing decisio=
n wrt reachability.</div>
<div dir=3D"auto">There are precedences of using IGP=E2=80=99s for differen=
t tasks, e.g. RFC 5088 and similar, however should we do it again?</div>
<div dir=3D"auto"><br></div>
<div dir=3D"auto">Specifically to use case described - I really don=E2=80=
=99t see how this information would be used in routing decisions (PCE compu=
tation). Moreover, if the end-goal is to build a connected graph of the dev=
ices that have a coherent iFIT feature set it would require reoptimization =
on every change and quite complex computation logic (talking SR - on top of=
 regular constrains, MSD, etc).I=E2=80=99d also think that there=E2=80=99s =
mandatory configuration of name-spaces and features supported, in other wor=
ds - autodiscovery is meaningless, it would still require as per device con=
figuration (hello YANG). Most of telemetry solutions are designed to pass t=
hought nodes that don=E2=80=99t support it transparently, so the real requi=
rement is really to know the sink-node (the one that is egress of the telem=
etry domain and must remove all additional encapsulations).=C2=A0</div>
<div dir=3D"auto"><br></div>
<div dir=3D"auto">As to the last point - we already have a kitchen-sink rou=
ting protocol =C2=A0;-)</div>
</div>
</div>
<div name=3D"messageSignatureSection"><br>
<div>Cheers,
<div>Jeff</div>
</div>
</div>
<div name=3D"messageReplySection">On Apr 2, 2020, 6:10 AM -0700, Robert Ras=
zuk &lt;<a href=3D"mailto:robert@raszuk.net" target=3D"_blank">robert@raszu=
k.net</a>&gt;, wrote:<br>
<blockquote type=3D"cite" style=3D"margin:5px;padding-left:10px;border-left=
:thin solid rgb(52,152,219)">
<div dir=3D"ltr">
<div><br></div>
<div>Hi Les,</div>
<div><br></div>
Ok very well.=C2=A0
<div><br></div>
<div>So till this draft provides a text or reference to some other document=
 how IGPs may use inband telemetry data for real path selection it does not=
 fit to LSR charter. Fair.=C2=A0</div>
<div><br></div>
<div>Hi Chris,</div>
<div><br></div>
<div>I am afraid=C2=A0we are looking at this from completely different pers=
pectives.=C2=A0</div>
<div><br></div>
<div>I consider=C2=A0this data to be a necessity for routing and you simply=
 treat it as some opaque telemetry. If we would think of it in the latter s=
ense sure you would be right. IGP is not a configuration push protocol. Suf=
ficient to observe how BGP became one :)=C2=A0</div>
<div><br></div>
<div>Many=C2=A0thx,</div>
<div>R.</div>
<div><br></div>
</div>
<br>
<div class=3D"gmail_quote">
<div dir=3D"ltr" class=3D"gmail_attr">On Thu, Apr 2, 2020 at 8:46 AM Les Gi=
nsberg (ginsberg) &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blan=
k">ginsberg@cisco.com</a>&gt; wrote:<br></div>
<blockquote class=3D"gmail_quote" style=3D"margin:5px;padding-left:10px;bor=
der-left:thin solid rgb(211,84,0)">Robert -<br>
<br>
First, +1 to what Chris has said.<br>
<br>
There is nothing in the lfit-capability draft that defines any information =
that can be used by IGPs to do what you suggest.<br>
Perhaps it is possible that information gleaned via a telemetry application=
 could be used by the IGPs to do something like what you suggest - but this=
 draft is not discussing/defining that. It is simply proposing to advertise=
 information about the capabilities of the lfit application on a given node=
..<br>
<br>
=C2=A0 =C2=A0Les<br>
<br>
&gt; -----Original Message-----<br>
&gt; From: Christian Hopps &lt;<a href=3D"mailto:chopps@chopps.org" target=
=3D"_blank">chopps@chopps.org</a>&gt;<br>
&gt; Sent: Thursday, April 02, 2020 5:13 AM<br>
&gt; To: Robert Raszuk &lt;<a href=3D"mailto:robert@raszuk.net" target=3D"_=
blank">robert@raszuk.net</a>&gt;<br>
&gt; Cc: Christian Hopps &lt;<a href=3D"mailto:chopps@chopps.org" target=3D=
"_blank">chopps@chopps.org</a>&gt;; Les Ginsberg (ginsberg)<br>
&gt; &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">ginsberg@c=
isco.com</a>&gt;; wangyali &lt;<a href=3D"mailto:wangyali11@huawei.com" tar=
get=3D"_blank">wangyali11@huawei.com</a>&gt;; Acee Lindem<br>
&gt; (acee) &lt;<a href=3D"mailto:acee@cisco.com" target=3D"_blank">acee@ci=
sco.com</a>&gt;; <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf=
..org</a>; Tianran Zhou<br>
&gt; &lt;<a href=3D"mailto:zhoutianran@huawei.com" target=3D"_blank">zhouti=
anran@huawei.com</a>&gt;<br>
&gt; Subject: Re: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-=
capability-02<br>
&gt;<br>
&gt; We have defined a perfectly acceptable and quite powerful way to do qu=
ery<br>
&gt; and configuration for routers, it&#39;s YANG. I&#39;d like to hear why=
 the the IETF<br>
&gt; standard mechanism for query and configuration can&#39;t work for this=
<br>
&gt; application.<br>
&gt;<br>
&gt; Telemetry is important, I don&#39;t think anyone has said or would say=
 that it isn&#39;t,<br>
&gt; but that seems orthogonal to this discussion.<br>
&gt;<br>
&gt; Thanks,<br>
&gt; Chris.<br>
&gt; [as WG member]<br>
&gt;<br>
&gt;<br>
&gt; &gt; On Apr 2, 2020, at 5:17 AM, Robert Raszuk &lt;<a href=3D"mailto:r=
obert@raszuk.net" target=3D"_blank">robert@raszuk.net</a>&gt; wrote:<br>
&gt; &gt;<br>
&gt; &gt; Hi Les,<br>
&gt; &gt;<br>
&gt; &gt; I would like to respectfully disagree with your assessment.<br>
&gt; &gt;<br>
&gt; &gt; The fact that today&#39;s IGP (or for that matter BGP) routing is=
 static from the<br>
&gt; perspective of not taking into consideration real performance measurem=
ents<br>
&gt; from the data plane to me is a bug not a feature.<br>
&gt; &gt;<br>
&gt; &gt; Building SPT based on static link metrics which in vast majority =
of cases<br>
&gt; today are emulated circuits on someone else IP backbone. It was a grea=
t idea<br>
&gt; when you constructed the network with connection oriented paradigm<br>
&gt; (Sonet,SDH, dark fiber, TDM ...) not connection less often best effort=
 one.<br>
&gt; &gt;<br>
&gt; &gt; So I find this proposal very useful and would vote for adopting i=
t in LSR WG.<br>
&gt; To me in-situ telemetry is not just some monitoring tool. It is an ext=
remely<br>
&gt; important element to influence how we compute reachability or at least=
 how<br>
&gt; we choose active forwarding paths from protocol RIBs to main RIB.<br>
&gt; &gt;<br>
&gt; &gt; If we extended IGPs to carry TE information, if we extended them =
to<br>
&gt; enable flexible algorithm based path computation I fail to understand =
why<br>
&gt; would we resist to natively enable all of the above with getting the i=
nputs<br>
&gt; from real networks to be used as to the parameters to the above mentio=
ned<br>
&gt; tools.<br>
&gt; &gt;<br>
&gt; &gt; Kind regards,<br>
&gt; &gt; R.<br>
&gt; &gt;<br>
&gt; &gt; On Thu, Apr 2, 2020 at 8:32 AM Les Ginsberg (ginsberg)<br>
&gt; &lt;ginsberg=3D<a href=3D"mailto:40cisco.com@dmarc.ietf.org" target=3D=
"_blank">40cisco.com@dmarc.ietf.org</a>&gt; wrote:<br>
&gt; &gt; Yali -<br>
&gt; &gt;<br>
&gt; &gt; There is a very significant difference between having IGPs advert=
ise an<br>
&gt; identifier for a service that they use as clients (BFD) and having IGP=
s<br>
&gt; advertise a set of capabilities/options for a telemetry application wh=
ich has<br>
&gt; no direct bearing on the function of the routing protocol.<br>
&gt; &gt;<br>
&gt; &gt; You are not the first to find using IGPs to flood application inf=
ormation very<br>
&gt; convenient.=C2=A0 But this is not the appropriate role for the IGPs an=
d over the<br>
&gt; years we have consistently resisted attempts to do so.<br>
&gt; &gt;<br>
&gt; &gt; Everything advertised in Router Capabilities today has some close=
<br>
&gt; relationship with the operation of the protocol. Do some of the existi=
ng<br>
&gt; advertisements &quot;bend the rules&quot; a bit more than I would pref=
er? Yes - but<br>
&gt; there has always been at least a close relationship to routing protoco=
l<br>
&gt; function.<br>
&gt; &gt; Here there is none.<br>
&gt; &gt;<br>
&gt; &gt; If you feel compelled to use IGPs to advertise application inform=
ation, you<br>
&gt; have RF6823 available (at least for IS-IS). But it is a &quot;high bar=
&quot; since it requires<br>
&gt; you also to use a separate IS-IS instance dedicated to advertising the=
<br>
&gt; application information (see RFC8202).<br>
&gt; &gt; I think Chris Hopps&#39;s suggestion to use Netconf/YANG to confi=
gure/retrieve<br>
&gt; what you need is most likely more attractive - but I will leave that f=
or you to<br>
&gt; decide.<br>
&gt; &gt;<br>
&gt; &gt; Using IGP Router Capabilities here is wrong in my view.<br>
&gt; &gt;<br>
&gt; &gt;=C2=A0 =C2=A0 Les<br>
&gt; &gt;<br>
&gt; &gt;<br>
&gt; &gt; &gt; -----Original Message-----<br>
&gt; &gt; &gt; From: wangyali &lt;<a href=3D"mailto:wangyali11@huawei.com" =
target=3D"_blank">wangyali11@huawei.com</a>&gt;<br>
&gt; &gt; &gt; Sent: Wednesday, April 01, 2020 8:12 PM<br>
&gt; &gt; &gt; To: Acee Lindem (acee) &lt;<a href=3D"mailto:acee@cisco.com"=
 target=3D"_blank">acee@cisco.com</a>&gt;; Les Ginsberg (ginsberg)<br>
&gt; &gt; &gt; &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">=
ginsberg@cisco.com</a>&gt;; Christian Hopps &lt;<a href=3D"mailto:chopps@ch=
opps.org" target=3D"_blank">chopps@chopps.org</a>&gt;<br>
&gt; &gt; &gt; Cc: <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ie=
tf.org</a>; Tianran Zhou &lt;<a href=3D"mailto:zhoutianran@huawei.com" targ=
et=3D"_blank">zhoutianran@huawei.com</a>&gt;<br>
&gt; &gt; &gt; Subject: =E7=AD=94=E5=A4=8D: [Lsr] A new version of I-D, dra=
ft-liu-lsr-isis-ifit-node-<br>
&gt; capability-<br>
&gt; &gt; &gt; 02<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; Hi Acee, Chris and Les,<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; This is Yali. Many thanks for your kind comments and suggest=
ion.<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; Besides of signaling MSD by IGP node CAPABILITY TLV, we lear=
ned that<br>
&gt; &gt; &gt; there&#39;s another RFC7883 that advertising S-BFD discrimin=
ators in IS-IS. In<br>
&gt; my<br>
&gt; &gt; &gt; understand, BFD is a protocol to detect faults in the bidire=
ctional path<br>
&gt; &gt; &gt; between two forwarding engines, including interface, data li=
nks, etc.<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; Similarly, IFIT provides a complete framework of a family of=
 on-path<br>
&gt; &gt; &gt; telemetry techniques, which are used to monitoring performan=
ce metrics<br>
&gt; of<br>
&gt; &gt; &gt; service flows, e.g. packet loss, delay. So we consider there=
&#39;s a same<br>
&gt; &gt; &gt; methodology with S-BFD that advertising IFIT node capabiliti=
es.<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; Please let us know your comments and opinion. Thanks.<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; Best regards,<br>
&gt; &gt; &gt; Yali<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----<br>
&gt; &gt; &gt; =E5=8F=91=E4=BB=B6=E4=BA=BA: Acee Lindem (acee) [mailto:<a h=
ref=3D"mailto:acee@cisco.com" target=3D"_blank">acee@cisco.com</a>]<br>
&gt; &gt; &gt; =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B44=E6=9C=
=881=E6=97=A5 20:29<br>
&gt; &gt; &gt; =E6=94=B6=E4=BB=B6=E4=BA=BA: Tianran Zhou &lt;<a href=3D"mai=
lto:zhoutianran@huawei.com" target=3D"_blank">zhoutianran@huawei.com</a>&gt=
;; Les Ginsberg<br>
&gt; (ginsberg)<br>
&gt; &gt; &gt; &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">=
ginsberg@cisco.com</a>&gt;; Christian Hopps &lt;<a href=3D"mailto:chopps@ch=
opps.org" target=3D"_blank">chopps@chopps.org</a>&gt;<br>
&gt; &gt; &gt; =E6=8A=84=E9=80=81: <a href=3D"mailto:lsr@ietf.org" target=
=3D"_blank">lsr@ietf.org</a>; wangyali &lt;<a href=3D"mailto:wangyali11@hua=
wei.com" target=3D"_blank">wangyali11@huawei.com</a>&gt;<br>
&gt; &gt; &gt; =E4=B8=BB=E9=A2=98: Re: [Lsr] A new version of I-D, draft-li=
u-lsr-isis-ifit-node-capability-<br>
&gt; 02<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; Speak as WG Member...<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt; =EF=BB=BFOn 4/1/20, 8:08 AM, &quot;Acee Lindem (acee)&quot; =
&lt;<a href=3D"mailto:acee@cisco.com" target=3D"_blank">acee@cisco.com</a>&=
gt; wrote:<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0There is also a difference between some o=
f the existing applications<br>
&gt; &gt; &gt; advertised in IGP capabilities. For example, MSD is used wit=
h the routing<br>
&gt; &gt; &gt; information to construct SR paths. The information for all t=
hese OAM<br>
&gt; &gt; &gt; mechanisms doesn&#39;t share this affinity. Also, it seems l=
ike a slippery slope<br>
&gt; in<br>
&gt; &gt; &gt; what is needed for each of the mechanism.<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0Thanks,<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0Acee<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0On 4/1/20, 4:01 AM, &quot;Lsr on behalf o=
f Tianran Zhou&quot; &lt;lsr-<br>
&gt; <a href=3D"mailto:bounces@ietf.org" target=3D"_blank">bounces@ietf.org=
</a><br>
&gt; &gt; &gt; on behalf of <a href=3D"mailto:zhoutianran@huawei.com" targe=
t=3D"_blank">zhoutianran@huawei.com</a>&gt; wrote:<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Hi Les,<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Thanks very much for your s=
uggestion. I have a quick look at rfc6823.<br>
&gt; &gt; &gt; Sounds like a good idea. I will think about it.<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Cheers,<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Tianran<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0-----Original Message-----<=
br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0From: Les Ginsberg (ginsber=
g) [mailto:<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">ginsberg=
@cisco.com</a>]<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Sent: Wednesday, April 1, 2=
020 1:47 PM<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0To: Tianran Zhou &lt;<a hre=
f=3D"mailto:zhoutianran@huawei.com" target=3D"_blank">zhoutianran@huawei.co=
m</a>&gt;; Christian Hopps<br>
&gt; &gt; &gt; &lt;<a href=3D"mailto:chopps@chopps.org" target=3D"_blank">c=
hopps@chopps.org</a>&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Cc: wangyali &lt;<a href=3D=
"mailto:wangyali11@huawei.com" target=3D"_blank">wangyali11@huawei.com</a>&=
gt;; <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</a><br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Subject: RE: [Lsr] A new ve=
rsion of I-D, draft-liu-lsr-isis-ifit-node-<br>
&gt; &gt; &gt; capability-02<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Tianran -<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0I am very much in agreement=
 with the points Chris has made.<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0IGPs do not exist to advert=
ise capabilities/configure applications -<br>
&gt; which<br>
&gt; &gt; &gt; seems to me to be what you are proposing here.<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0The fact that you can easil=
y define the encodings does not make it<br>
&gt; the<br>
&gt; &gt; &gt; right thing to do.<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0This issue was discussed at=
 length in the context of<br>
&gt; &gt; &gt; <a href=3D"https://tools.ietf.org/html/rfc6823" rel=3D"noref=
errer" target=3D"_blank">https://tools.ietf.org/html/rfc6823</a> . If you w=
ere proposing to use<br>
&gt; GENAPP I<br>
&gt; &gt; &gt; would not object - though I do think Chris has correctly poi=
nted out that<br>
&gt; &gt; &gt; NETCONF/YANG is likely a more appropriate solution for your =
use case.<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Les<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; -----Original Message-=
----<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; From: Tianran Zhou &lt=
;<a href=3D"mailto:zhoutianran@huawei.com" target=3D"_blank">zhoutianran@hu=
awei.com</a>&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Sent: Tuesday, March 3=
1, 2020 7:53 PM<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; To: Christian Hopps &l=
t;<a href=3D"mailto:chopps@chopps.org" target=3D"_blank">chopps@chopps.org<=
/a>&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Cc: wangyali &lt;<a hr=
ef=3D"mailto:wangyali11@huawei.com" target=3D"_blank">wangyali11@huawei.com=
</a>&gt;; Les Ginsberg (ginsberg)<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; &lt;<a href=3D"mailto:=
ginsberg@cisco.com" target=3D"_blank">ginsberg@cisco.com</a>&gt;; <a href=
=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</a><br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Subject: RE: [Lsr] A n=
ew version of I-D,<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; draft-liu-lsr-isis-ifi=
t-node-capability-02<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Hi Chris,<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Thanks for your quick =
reply, and please see inline.<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Cheers,<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Tianran<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; -----Original Message-=
----<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; From: Christian Hopps =
[mailto:<a href=3D"mailto:chopps@chopps.org" target=3D"_blank">chopps@chopp=
s.org</a>]<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Sent: Wednesday, April=
 1, 2020 10:00 AM<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; To: Tianran Zhou &lt;<=
a href=3D"mailto:zhoutianran@huawei.com" target=3D"_blank">zhoutianran@huaw=
ei.com</a>&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Cc: Christian Hopps &l=
t;<a href=3D"mailto:chopps@chopps.org" target=3D"_blank">chopps@chopps.org<=
/a>&gt;; wangyali<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; &lt;<a href=3D"mailto:=
wangyali11@huawei.com" target=3D"_blank">wangyali11@huawei.com</a>&gt;; Les=
 Ginsberg (ginsberg)<br>
&gt; &gt; &gt; &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">=
ginsberg@cisco.com</a>&gt;;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; <a href=3D"mailto:lsr@=
ietf.org" target=3D"_blank">lsr@ietf.org</a><br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Subject: Re: [Lsr] A n=
ew version of I-D,<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; draft-liu-lsr-isis-ifi=
t-node-capability-02<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; &gt; On Mar 31, 2020, =
at 9:28 PM, Tianran Zhou<br>
&gt; &gt; &gt; &lt;<a href=3D"mailto:zhoutianran@huawei.com" target=3D"_bla=
nk">zhoutianran@huawei.com</a>&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; wrote:<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; &gt; ZTR&gt; Let&#39;s=
 not boil the ocean to compare NETCONF/YANG or<br>
&gt; routing<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; protocol, which is bet=
ter. But I did not see the modification to<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; routing protocol with =
some TLVs is a heavy work, or more complex<br>
&gt; than<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; NETCONF/YANG.=C2=A0 I =
see both are available and useful.<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; I&#39;m not sure what =
you mean by boiling the ocean. I&#39;m saying that<br>
&gt; YANG<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; is built and intended =
for querying capabilities and configuring<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; routers. Why isn&#39;t=
 that where you are looking first for configuring<br>
&gt; your<br>
&gt; &gt; &gt; monitoring application?<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; ZTR&gt; I know NETCONF=
 can do both query and configuration. And I<br>
&gt; &gt; &gt; know<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; resent YANG-Push impro=
vements to reduce the polling.=C2=A0 But<br>
&gt; routing<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; protocol solutions are=
 also widely used for this. There are already<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; many RFCs and implemen=
tation practices. We considered both<br>
&gt; ways,<br>
&gt; &gt; &gt; and<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; aimed for different sc=
enarios.<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; You don&#39;t see the =
major difference between writing a YANG model<br>
&gt; vs<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; modifying all of the s=
tandard IETF routing protocols?<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; ZTR&gt; I know many di=
fferences between NETCONF and routing<br>
&gt; &gt; &gt; protocol.<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; There are many details=
 on both interfaces, implementations,<br>
&gt; scenarios<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; when comparing them. T=
hat&#39;s what I mean boil the ocean.<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Here I do not know wha=
t&#39;s the &quot;major difference&quot; you mean?<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Thanks,<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0&gt; Chris.<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0___________________________=
____________________<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Lsr mailing list<br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"mailto:Lsr@ietf.=
org" target=3D"_blank">Lsr@ietf.org</a><br>
&gt; &gt; &gt;=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://www.ietf=
..org/mailman/listinfo/lsr" rel=3D"noreferrer" target=3D"_blank">https://ww=
w..ietf.org/mailman/listinfo/lsr</a><br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;<br>
&gt; &gt; &gt;<br>
&gt; &gt;<br>
&gt; &gt; _______________________________________________<br>
&gt; &gt; Lsr mailing list<br>
&gt; &gt; <a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a=
><br>
&gt; &gt; <a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"nore=
ferrer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
<br></blockquote>
</div>
_______________________________________________<br>
Lsr mailing list<br>
<a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr" target=3D"_blank">htt=
ps://www.ietf.org/mailman/listinfo/lsr</a><br></blockquote>
</div>
</div>
</blockquote>
</div>
</blockquote>
</div>
</div>

</blockquote></div>

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References: <1520992FC97B944A9979C2FC1D7DB0F404DB1AD4@dggeml524-mbx.china.huawei.com> <MW3PR11MB4619361A2CA3A402A44914E5C1FE0@MW3PR11MB4619.namprd11.prod.outlook.com> <1520992FC97B944A9979C2FC1D7DB0F404DB2336@dggeml524-mbx.china.huawei.com> <68249E56-5702-4C15-9748-439E43F3EB0E@chopps.org> <1520992FC97B944A9979C2FC1D7DB0F404DEFC14@dggeml524-mbx.china.huawei.com> <A937FECB-2013-403E-89B2-47971514F6CF@chopps.org> <80a8f83c76d447dda48280495b3a80a7@huawei.com> <6F0E8437-5D82-4FAC-A061-69E56E1E161D@chopps.org> <2189e17f36764960bf2dcc554cde9ce0@huawei.com> <MW3PR11MB4619925BEF83B0C4512DD284C1C90@MW3PR11MB4619.namprd11.prod.outlook.com> <06e8443210924ac788c40fa15972cbdd@huawei.com> <C987B657-64D1-4C70-B471-ED9F1266B990@cisco.com> <3948044C-0CC9-4AE8-8541-4D23A5DF396E@cisco.com> <1520992FC97B944A9979C2FC1D7DB0F404DF089E@dggeml524-mbx.china.huawei.com> <MW3PR11MB46197F8C43B3200B07641838C1C60@MW3PR11MB4619.namprd11.prod.outlook.com> <CAOj+MMGsVkws0sTw4RRdb_SdWvsuh+2Dxc-upXqT2_pmpO_+Lg@mail.gmail.com> <6930807B-2FF0-4A5C-AD39-D05345C37A5E@chopps.org> <MW3PR11MB461955420610E933ACC44BC4C1C60@MW3PR11MB4619.namprd11.prod.outlook.com> <CAOj+MMHoTbDzZrA1ttPsdD5Tk7TADaR=ex5WGF=6+X3X1utoHg@mail.gmail.com> <bd193457-956c-47b0-a50b-8d1778e8349a@Spark> <CAOj+MMGuRHVoJ3ez4nQ3O87J4U+-+yabYWeA1AEfj1UGAbPp7w@mail.gmail.com> <3DFEBF57-427E-425E-B5D2-48F683519D16@chopps.org> <CAOj+MMFqoVrWY2K4DJ6_1Kmdu4gv6jwm6c3q_HOTTSCSY7U_3A@mail.gmail.com> <40DA7CC2-5EAA-4539-AEEF-6BD5827C6FBB@cisco.com>
In-Reply-To: <40DA7CC2-5EAA-4539-AEEF-6BD5827C6FBB@cisco.com>
From: Robert Raszuk <robert@raszuk.net>
Date: Fri, 3 Apr 2020 00:34:32 +0200
Message-ID: <CAOj+MMExfWg8SBZ9DRAnZdiA=t2XA7kuT==-T-okVS9b8dYbag@mail.gmail.com>
To: "Acee Lindem (acee)" <acee@cisco.com>
Cc: Christian Hopps <chopps@chopps.org>, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>,  Jeff Tantsura <jefftant.ietf@gmail.com>, Tianran Zhou <zhoutianran@huawei.com>, wangyali <wangyali11@huawei.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/7FdgCqIm8ha8XWzPaEW6JliVqNI>
Subject: Re: [Lsr] problem joining interim [Re: A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02]
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Well I did not knock (notify the host and politely ask to join) as I
assumed IETF WG meeting doors should be open. I figured maybe host just
does not like me to join the party :-)

I think my mistake was that I did not expect password to be needed. Learned
something new then !

Cheers,
R.

On Fri, Apr 3, 2020 at 12:22 AM Acee Lindem (acee) <acee@cisco.com> wrote:

> As host of the meeting, I didn=E2=80=99t see any indication that you were=
 waiting
> in the lobby.
>
> Thanks,
>
> Acee
>
>
>
> *From: *Robert Raszuk <robert@raszuk.net>
> *Date: *Thursday, April 2, 2020 at 6:10 PM
> *To: *Christian Hopps <chopps@chopps.org>
> *Cc: *"Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "lsr@ietf.org" <
> lsr@ietf.org>, Jeff Tantsura <jefftant.ietf@gmail.com>, Tianran Zhou <
> zhoutianran@huawei.com>, Acee Lindem <acee@cisco.com>, wangyali <
> wangyali11@huawei.com>
> *Subject: *Re: [Lsr] problem joining interim [Re: A new version of I-D,
> draft-liu-lsr-isis-ifit-node-capability-02]
>
>
>
> Hi Chris,
>
>
>
> I never noticed the password ...
>
>
>
> Just few days back I participated in IDR and no password was needed or
> perhaps webex invite link contained a token relaxing from needing one.
>
>
>
> Cheers,
> R.
>
>
>
> On Fri, Apr 3, 2020 at 12:00 AM Christian Hopps <chopps@chopps.org> wrote=
:
>
>
>
> > On Apr 2, 2020, at 5:17 PM, Robert Raszuk <robert@raszuk.net> wrote:
> >
> > Many thx,
> > R.
> >
> > PS. As we are talking LSR here it is strange that joining virtual LSR
> meeting is not for everyone. I was waiting and tried three times today fo=
r
> host approval to join which was not granted.
> >
>
> I am very sorry to hear this! We had 64 participants, at least at one
> point that I saw. I set the meeting up, and I don't believe there is any
> way to exclude anyone in particular, I certainly would never have chosen =
to
> do that.
>
> However, Webex has a password requirement when setting up meetings (I
> guess, I tried to not have one, it wouldn't let me) which we included in
> all the details wherever the details were posted, it was "linkstate".
>
> I did notice an email, from webex, during the meeting about a request fro=
m
> Bruno to join as guest, but he was in the participant list when I then
> checked. I didn't receive any other emails like that (and FWIW I had 5
> windows over 2 monitors going at once trying to manage all this, so
> noticing the 1 email was lucky).
>
> Did it let you skip entering a password (or did it not offer the option i=
n
> the first place)?
>
> It would be good to figure this out before the next interim.
>
> Thanks,
> Chris.
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>
>

--00000000000027021105a256687d
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div><br></div>Well I did not knock (notify the host and p=
olitely ask to join) as I assumed IETF WG meeting doors should be open. I f=
igured maybe host just does not like me to=C2=A0join the=C2=A0party :-)=C2=
=A0<div><br></div><div>I think my mistake was that=C2=A0I did not expect=C2=
=A0password=C2=A0to be needed. Learned something new then !</div><div><br><=
/div><div>Cheers,</div><div>R.</div></div><br><div class=3D"gmail_quote"><d=
iv dir=3D"ltr" class=3D"gmail_attr">On Fri, Apr 3, 2020 at 12:22 AM Acee Li=
ndem (acee) &lt;<a href=3D"mailto:acee@cisco.com">acee@cisco.com</a>&gt; wr=
ote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px=
 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">





<div lang=3D"EN-US">
<div class=3D"gmail-m_-3730005812439571858WordSection1">
<p class=3D"MsoNormal">As host of the meeting, I didn=E2=80=99t see any ind=
ication that you were waiting in the lobby.
<u></u><u></u></p>
<p class=3D"MsoNormal">Thanks,<u></u><u></u></p>
<p class=3D"MsoNormal">Acee<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div style=3D"border-right:none;border-bottom:none;border-left:none;border-=
top:1pt solid rgb(181,196,223);padding:3pt 0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:0.5in"><b><span style=3D"font-s=
ize:12pt;color:black">From:
</span></b><span style=3D"font-size:12pt;color:black">Robert Raszuk &lt;<a =
href=3D"mailto:robert@raszuk.net" target=3D"_blank">robert@raszuk.net</a>&g=
t;<br>
<b>Date: </b>Thursday, April 2, 2020 at 6:10 PM<br>
<b>To: </b>Christian Hopps &lt;<a href=3D"mailto:chopps@chopps.org" target=
=3D"_blank">chopps@chopps.org</a>&gt;<br>
<b>Cc: </b>&quot;Les Ginsberg (ginsberg)&quot; &lt;<a href=3D"mailto:ginsbe=
rg@cisco.com" target=3D"_blank">ginsberg@cisco.com</a>&gt;, &quot;<a href=
=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</a>&quot; &lt;<a hr=
ef=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</a>&gt;, Jeff Tan=
tsura &lt;<a href=3D"mailto:jefftant.ietf@gmail.com" target=3D"_blank">jeff=
tant.ietf@gmail.com</a>&gt;, Tianran Zhou &lt;<a href=3D"mailto:zhoutianran=
@huawei.com" target=3D"_blank">zhoutianran@huawei.com</a>&gt;, Acee Lindem =
&lt;<a href=3D"mailto:acee@cisco.com" target=3D"_blank">acee@cisco.com</a>&=
gt;, wangyali &lt;<a href=3D"mailto:wangyali11@huawei.com" target=3D"_blank=
">wangyali11@huawei.com</a>&gt;<br>
<b>Subject: </b>Re: [Lsr] problem joining interim [Re: A new version of I-D=
, draft-liu-lsr-isis-ifit-node-capability-02]<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:0.5in"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:0.5in">Hi Chris, <u></u><u></u>=
</p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:0.5in"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:0.5in">I never noticed the pass=
word ...=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:0.5in"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:0.5in">Just few days back I par=
ticipated in IDR and no password=C2=A0was needed or perhaps webex invite li=
nk contained a token relaxing from needing one.=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:0.5in"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:0.5in">Cheers,<br>
R.<u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:0.5in"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:0.5in">On Fri, Apr 3, 2020 at 1=
2:00 AM Christian Hopps &lt;<a href=3D"mailto:chopps@chopps.org" target=3D"=
_blank">chopps@chopps.org</a>&gt; wrote:<u></u><u></u></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<p class=3D"MsoNormal" style=3D"margin-left:0.5in"><br>
<br>
&gt; On Apr 2, 2020, at 5:17 PM, Robert Raszuk &lt;<a href=3D"mailto:robert=
@raszuk.net" target=3D"_blank">robert@raszuk.net</a>&gt; wrote:<br>
&gt; <br>
&gt; Many thx,<br>
&gt; R.<br>
&gt; <br>
&gt; PS. As we are talking LSR here it is strange that joining virtual LSR =
meeting is not for everyone. I was waiting and tried three times today for =
host approval to join which was not granted.
<br>
&gt; <br>
<br>
I am very sorry to hear this! We had 64 participants, at least at one point=
 that I saw. I set the meeting up, and I don&#39;t believe there is any way=
 to exclude anyone in particular, I certainly would never have chosen to do=
 that.<br>
<br>
However, Webex has a password requirement when setting up meetings (I guess=
, I tried to not have one, it wouldn&#39;t let me) which we included in all=
 the details wherever the details were posted, it was &quot;linkstate&quot;=
.<br>
<br>
I did notice an email, from webex, during the meeting about a request from =
Bruno to join as guest, but he was in the participant list when I then chec=
ked. I didn&#39;t receive any other emails like that (and FWIW I had 5 wind=
ows over 2 monitors going at once trying
 to manage all this, so noticing the 1 email was lucky).<br>
<br>
Did it let you skip entering a password (or did it not offer the option in =
the first place)?<br>
<br>
It would be good to figure this out before the next interim.<br>
<br>
Thanks,<br>
Chris.<br>
<br>
_______________________________________________<br>
Lsr mailing list<br>
<a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr" target=3D"_blank">htt=
ps://www.ietf.org/mailman/listinfo/lsr</a><u></u><u></u></p>
</blockquote>
</div>
</div>
</div>

</blockquote></div>

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Cc: Christian Hopps <chopps@chopps.org>, Jeff Tantsura <jefftant.ietf@gmail.com>, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>, "Acee Lindem (acee)" <acee@cisco.com>, Tianran Zhou <zhoutianran@huawei.com>, wangyali <wangyali11@huawei.com>
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> On Apr 2, 2020, at 6:28 PM, Robert Raszuk <robert@raszuk.net> wrote:
>=20
> Well Jeff if you would completely remove CSPF and Flex Algo from IGPs =
I am fully with you.=20
>=20
> But till we still have them running in the routers I am of the opinion =
that we need both ... bigger and slower PCE based path computation and =
sufficient information (not only static data) for routers itself to be =
able to adjust forwarding state based on the live path constraints.=20
>=20
> I realize I am thinking outside of the box here but hopefully one day =
this will become a norm rather then abstraction :)

You don't need the IGP advertising this stuff in order to do anything =
you've suggested.

Thanks,
Chris.
[as WG member]

> Best,
> R.,
>=20
> On Fri, Apr 3, 2020 at 12:24 AM Jeff Tantsura =
<jefftant.ietf@gmail.com> wrote:
> Robert,
>=20
> That is why we have a possibility to signal in-band/as per device data =
that could be used by PCE to compute a path that meets the constrains =
(RFC 7471/7810), e.g per node BW  reserved/available or cumulative =
delay, and similar, computed by the PCE.
> However if the objective functions used by CSPF are coming from =
outside (end2end latency measurement/$$ of a link  as an example) we =
don=E2=80=99t feed them back into IGP, telemetry analysis (done by an =
external system) are of no business of IGP and should be fed =
(normalized) into PCE directly.=20
> We are not discussing the value of telemetry, which is obvious, but =
need to autodiscover telemetry capability=E2=80=99s and feed (pollute) =
them into IGP->BGP-LS->controller.
> I don=E2=80=99t see how this information would be used in route/path =
computation and hence IMHO it doesn=E2=80=99t belong in IGP. Given the =
need for configuration (besides ability to support particular =
technology) makes this a clear candidate for management plane =
operations. (Chris=E2=80=99 comment about YANG)
>=20
> Cheers,
> Jeff
> On Apr 2, 2020, 2:17 PM -0700, Robert Raszuk <robert@raszuk.net>, =
wrote:
>> Jeff.
>>=20
>> > The role of a routing protocol is to distribute: reachability (doh =
:-))=20
>> > and any additional data that could influence routing decision wrt =
reachability. =20
>>=20
>> The bolded text is precisely the point here.=20
>>=20
>> So let me provide a very simple example.=20
>>=20
>> Today routers already compute CSPF. Moreover today routers are asked =
to use custom/flexible algorithm to choose reachability paths.=20
>>=20
>> So just imagine an operator who says:=20
>>=20
>> Please compute my SPT with the consideration that end to end inband =
jitter is not greater then 10 ms otherwise I do not want to see nodes =
which do not meet that criteria in the reachability graph for =
application X.
>>=20
>> or=20
>>=20
>> Please compute my SPT with the consideration that end to end drop =
rate is not greater then  5pps otherwise I do not want to see nodes =
which do not meet that criteria in the reachability graph for =
application Y.=20
>>=20
>> etc ...=20
>>=20
>> If you consider such constrains to provide reachability for =
applications you will likely see value that in-situ telemetry is your =
friend here. Really best friend as without him you can not do the proper =
end to end path exclusion for SPT computations.=20
>>=20
>> Hint: All per link extensions which were added to IGPs are not going =
to help here as drops or jitter may equally happen in the routers fabric =
on fabric to LC boundaries or on the line cards and links. So you need =
end to end test stream.=20
>>=20
>> Many thx,
>> R.
>>=20
>> PS. As we are talking LSR here it is strange that joining virtual LSR =
meeting is not for everyone. I was waiting and tried three times today =
for host approval to join which was not granted.=20
>>=20
>> On Thu, Apr 2, 2020 at 11:00 PM Jeff Tantsura =
<jefftant.ietf@gmail.com> wrote:
>> Robert,
>>=20
>> This is unnecessary leakage of management plane into control plane.
>> The role of a routing protocol is to distribute: reachability (doh =
:-)) and any additional data that could influence routing decision wrt =
reachability.
>> There are precedences of using IGP=E2=80=99s for different tasks, =
e.g. RFC 5088 and similar, however should we do it again?
>>=20
>> Specifically to use case described - I really don=E2=80=99t see how =
this information would be used in routing decisions (PCE computation). =
Moreover, if the end-goal is to build a connected graph of the devices =
that have a coherent iFIT feature set it would require reoptimization on =
every change and quite complex computation logic (talking SR - on top of =
regular constrains, MSD, etc).I=E2=80=99d also think that there=E2=80=99s =
mandatory configuration of name-spaces and features supported, in other =
words - autodiscovery is meaningless, it would still require as per =
device configuration (hello YANG). Most of telemetry solutions are =
designed to pass thought nodes that don=E2=80=99t support it =
transparently, so the real requirement is really to know the sink-node =
(the one that is egress of the telemetry domain and must remove all =
additional encapsulations).=20
>>=20
>> As to the last point - we already have a kitchen-sink routing =
protocol  ;-)
>>=20
>> Cheers,
>> Jeff
>> On Apr 2, 2020, 6:10 AM -0700, Robert Raszuk <robert@raszuk.net>, =
wrote:
>>>=20
>>> Hi Les,
>>>=20
>>> Ok very well.=20
>>>=20
>>> So till this draft provides a text or reference to some other =
document how IGPs may use inband telemetry data for real path selection =
it does not fit to LSR charter. Fair.=20
>>>=20
>>> Hi Chris,
>>>=20
>>> I am afraid we are looking at this from completely different =
perspectives.=20
>>>=20
>>> I consider this data to be a necessity for routing and you simply =
treat it as some opaque telemetry. If we would think of it in the latter =
sense sure you would be right. IGP is not a configuration push protocol. =
Sufficient to observe how BGP became one :)=20
>>>=20
>>> Many thx,
>>> R.
>>>=20
>>>=20
>>> On Thu, Apr 2, 2020 at 8:46 AM Les Ginsberg (ginsberg) =
<ginsberg@cisco.com> wrote:
>>> Robert -
>>>=20
>>> First, +1 to what Chris has said.
>>>=20
>>> There is nothing in the lfit-capability draft that defines any =
information that can be used by IGPs to do what you suggest.
>>> Perhaps it is possible that information gleaned via a telemetry =
application could be used by the IGPs to do something like what you =
suggest - but this draft is not discussing/defining that. It is simply =
proposing to advertise information about the capabilities of the lfit =
application on a given node..
>>>=20
>>>    Les
>>>=20
>>> > -----Original Message-----
>>> > From: Christian Hopps <chopps@chopps.org>
>>> > Sent: Thursday, April 02, 2020 5:13 AM
>>> > To: Robert Raszuk <robert@raszuk.net>
>>> > Cc: Christian Hopps <chopps@chopps.org>; Les Ginsberg (ginsberg)
>>> > <ginsberg@cisco.com>; wangyali <wangyali11@huawei.com>; Acee =
Lindem
>>> > (acee) <acee@cisco.com>; lsr@ietf..org; Tianran Zhou
>>> > <zhoutianran@huawei.com>
>>> > Subject: Re: [Lsr] A new version of I-D, =
draft-liu-lsr-isis-ifit-node-capability-02
>>> >
>>> > We have defined a perfectly acceptable and quite powerful way to =
do query
>>> > and configuration for routers, it's YANG. I'd like to hear why the =
the IETF
>>> > standard mechanism for query and configuration can't work for this
>>> > application.
>>> >
>>> > Telemetry is important, I don't think anyone has said or would say =
that it isn't,
>>> > but that seems orthogonal to this discussion.
>>> >
>>> > Thanks,
>>> > Chris.
>>> > [as WG member]
>>> >
>>> >
>>> > > On Apr 2, 2020, at 5:17 AM, Robert Raszuk <robert@raszuk.net> =
wrote:
>>> > >
>>> > > Hi Les,
>>> > >
>>> > > I would like to respectfully disagree with your assessment.
>>> > >
>>> > > The fact that today's IGP (or for that matter BGP) routing is =
static from the
>>> > perspective of not taking into consideration real performance =
measurements
>>> > from the data plane to me is a bug not a feature.
>>> > >
>>> > > Building SPT based on static link metrics which in vast majority =
of cases
>>> > today are emulated circuits on someone else IP backbone. It was a =
great idea
>>> > when you constructed the network with connection oriented paradigm
>>> > (Sonet,SDH, dark fiber, TDM ...) not connection less often best =
effort one.
>>> > >
>>> > > So I find this proposal very useful and would vote for adopting =
it in LSR WG.
>>> > To me in-situ telemetry is not just some monitoring tool. It is an =
extremely
>>> > important element to influence how we compute reachability or at =
least how
>>> > we choose active forwarding paths from protocol RIBs to main RIB.
>>> > >
>>> > > If we extended IGPs to carry TE information, if we extended them =
to
>>> > enable flexible algorithm based path computation I fail to =
understand why
>>> > would we resist to natively enable all of the above with getting =
the inputs
>>> > from real networks to be used as to the parameters to the above =
mentioned
>>> > tools.
>>> > >
>>> > > Kind regards,
>>> > > R.
>>> > >
>>> > > On Thu, Apr 2, 2020 at 8:32 AM Les Ginsberg (ginsberg)
>>> > <ginsberg=3D40cisco.com@dmarc.ietf.org> wrote:
>>> > > Yali -
>>> > >
>>> > > There is a very significant difference between having IGPs =
advertise an
>>> > identifier for a service that they use as clients (BFD) and having =
IGPs
>>> > advertise a set of capabilities/options for a telemetry =
application which has
>>> > no direct bearing on the function of the routing protocol.
>>> > >
>>> > > You are not the first to find using IGPs to flood application =
information very
>>> > convenient.  But this is not the appropriate role for the IGPs and =
over the
>>> > years we have consistently resisted attempts to do so.
>>> > >
>>> > > Everything advertised in Router Capabilities today has some =
close
>>> > relationship with the operation of the protocol. Do some of the =
existing
>>> > advertisements "bend the rules" a bit more than I would prefer? =
Yes - but
>>> > there has always been at least a close relationship to routing =
protocol
>>> > function.
>>> > > Here there is none.
>>> > >
>>> > > If you feel compelled to use IGPs to advertise application =
information, you
>>> > have RF6823 available (at least for IS-IS). But it is a "high bar" =
since it requires
>>> > you also to use a separate IS-IS instance dedicated to advertising =
the
>>> > application information (see RFC8202).
>>> > > I think Chris Hopps's suggestion to use Netconf/YANG to =
configure/retrieve
>>> > what you need is most likely more attractive - but I will leave =
that for you to
>>> > decide.
>>> > >
>>> > > Using IGP Router Capabilities here is wrong in my view.
>>> > >
>>> > >    Les
>>> > >
>>> > >
>>> > > > -----Original Message-----
>>> > > > From: wangyali <wangyali11@huawei.com>
>>> > > > Sent: Wednesday, April 01, 2020 8:12 PM
>>> > > > To: Acee Lindem (acee) <acee@cisco.com>; Les Ginsberg =
(ginsberg)
>>> > > > <ginsberg@cisco.com>; Christian Hopps <chopps@chopps.org>
>>> > > > Cc: lsr@ietf.org; Tianran Zhou <zhoutianran@huawei.com>
>>> > > > Subject: =E7=AD=94=E5=A4=8D: [Lsr] A new version of I-D, =
draft-liu-lsr-isis-ifit-node-
>>> > capability-
>>> > > > 02
>>> > > >
>>> > > > Hi Acee, Chris and Les,
>>> > > >
>>> > > > This is Yali. Many thanks for your kind comments and =
suggestion.
>>> > > >
>>> > > > Besides of signaling MSD by IGP node CAPABILITY TLV, we =
learned that
>>> > > > there's another RFC7883 that advertising S-BFD discriminators =
in IS-IS. In
>>> > my
>>> > > > understand, BFD is a protocol to detect faults in the =
bidirectional path
>>> > > > between two forwarding engines, including interface, data =
links, etc.
>>> > > >
>>> > > > Similarly, IFIT provides a complete framework of a family of =
on-path
>>> > > > telemetry techniques, which are used to monitoring performance =
metrics
>>> > of
>>> > > > service flows, e.g. packet loss, delay. So we consider there's =
a same
>>> > > > methodology with S-BFD that advertising IFIT node =
capabilities.
>>> > > >
>>> > > > Please let us know your comments and opinion. Thanks.
>>> > > >
>>> > > > Best regards,
>>> > > > Yali
>>> > > >
>>> > > > -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
>>> > > > =E5=8F=91=E4=BB=B6=E4=BA=BA: Acee Lindem (acee) =
[mailto:acee@cisco.com]
>>> > > > =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B44=E6=9C=881=E6=
=97=A5 20:29
>>> > > > =E6=94=B6=E4=BB=B6=E4=BA=BA: Tianran Zhou =
<zhoutianran@huawei.com>; Les Ginsberg
>>> > (ginsberg)
>>> > > > <ginsberg@cisco.com>; Christian Hopps <chopps@chopps.org>
>>> > > > =E6=8A=84=E9=80=81: lsr@ietf.org; wangyali =
<wangyali11@huawei.com>
>>> > > > =E4=B8=BB=E9=A2=98: Re: [Lsr] A new version of I-D, =
draft-liu-lsr-isis-ifit-node-capability-
>>> > 02
>>> > > >
>>> > > > Speak as WG Member...
>>> > > >
>>> > > > =EF=BB=BFOn 4/1/20, 8:08 AM, "Acee Lindem (acee)" =
<acee@cisco.com> wrote:
>>> > > >
>>> > > >     There is also a difference between some of the existing =
applications
>>> > > > advertised in IGP capabilities. For example, MSD is used with =
the routing
>>> > > > information to construct SR paths. The information for all =
these OAM
>>> > > > mechanisms doesn't share this affinity. Also, it seems like a =
slippery slope
>>> > in
>>> > > > what is needed for each of the mechanism.
>>> > > >     Thanks,
>>> > > >     Acee
>>> > > >
>>> > > >     On 4/1/20, 4:01 AM, "Lsr on behalf of Tianran Zhou" <lsr-
>>> > bounces@ietf.org
>>> > > > on behalf of zhoutianran@huawei.com> wrote:
>>> > > >
>>> > > >         Hi Les,
>>> > > >
>>> > > >         Thanks very much for your suggestion. I have a quick =
look at rfc6823.
>>> > > > Sounds like a good idea. I will think about it.
>>> > > >
>>> > > >         Cheers,
>>> > > >         Tianran
>>> > > >
>>> > > >         -----Original Message-----
>>> > > >         From: Les Ginsberg (ginsberg) =
[mailto:ginsberg@cisco.com]
>>> > > >         Sent: Wednesday, April 1, 2020 1:47 PM
>>> > > >         To: Tianran Zhou <zhoutianran@huawei.com>; Christian =
Hopps
>>> > > > <chopps@chopps.org>
>>> > > >         Cc: wangyali <wangyali11@huawei.com>; lsr@ietf.org
>>> > > >         Subject: RE: [Lsr] A new version of I-D, =
draft-liu-lsr-isis-ifit-node-
>>> > > > capability-02
>>> > > >
>>> > > >         Tianran -
>>> > > >
>>> > > >         I am very much in agreement with the points Chris has =
made.
>>> > > >
>>> > > >         IGPs do not exist to advertise capabilities/configure =
applications -
>>> > which
>>> > > > seems to me to be what you are proposing here.
>>> > > >         The fact that you can easily define the encodings does =
not make it
>>> > the
>>> > > > right thing to do.
>>> > > >
>>> > > >         This issue was discussed at length in the context of
>>> > > > https://tools.ietf.org/html/rfc6823 . If you were proposing to =
use
>>> > GENAPP I
>>> > > > would not object - though I do think Chris has correctly =
pointed out that
>>> > > > NETCONF/YANG is likely a more appropriate solution for your =
use case.
>>> > > >
>>> > > >            Les
>>> > > >
>>> > > >
>>> > > >         > -----Original Message-----
>>> > > >         > From: Tianran Zhou <zhoutianran@huawei.com>
>>> > > >         > Sent: Tuesday, March 31, 2020 7:53 PM
>>> > > >         > To: Christian Hopps <chopps@chopps.org>
>>> > > >         > Cc: wangyali <wangyali11@huawei.com>; Les Ginsberg =
(ginsberg)
>>> > > >         > <ginsberg@cisco.com>; lsr@ietf.org
>>> > > >         > Subject: RE: [Lsr] A new version of I-D,
>>> > > >         > draft-liu-lsr-isis-ifit-node-capability-02
>>> > > >         >
>>> > > >         > Hi Chris,
>>> > > >         > Thanks for your quick reply, and please see inline.
>>> > > >         >
>>> > > >         > Cheers,
>>> > > >         > Tianran
>>> > > >         >
>>> > > >         > -----Original Message-----
>>> > > >         > From: Christian Hopps [mailto:chopps@chopps.org]
>>> > > >         > Sent: Wednesday, April 1, 2020 10:00 AM
>>> > > >         > To: Tianran Zhou <zhoutianran@huawei.com>
>>> > > >         > Cc: Christian Hopps <chopps@chopps.org>; wangyali
>>> > > >         > <wangyali11@huawei.com>; Les Ginsberg (ginsberg)
>>> > > > <ginsberg@cisco.com>;
>>> > > >         > lsr@ietf.org
>>> > > >         > Subject: Re: [Lsr] A new version of I-D,
>>> > > >         > draft-liu-lsr-isis-ifit-node-capability-02
>>> > > >         >
>>> > > >         >
>>> > > >         >
>>> > > >         > > On Mar 31, 2020, at 9:28 PM, Tianran Zhou
>>> > > > <zhoutianran@huawei.com>
>>> > > >         > wrote:
>>> > > >         > >
>>> > > >         > > ZTR> Let's not boil the ocean to compare =
NETCONF/YANG or
>>> > routing
>>> > > >         > protocol, which is better. But I did not see the =
modification to
>>> > > >         > routing protocol with some TLVs is a heavy work, or =
more complex
>>> > than
>>> > > >         > NETCONF/YANG.  I see both are available and useful.
>>> > > >         >
>>> > > >         > I'm not sure what you mean by boiling the ocean. I'm =
saying that
>>> > YANG
>>> > > >         > is built and intended for querying capabilities and =
configuring
>>> > > >         > routers. Why isn't that where you are looking first =
for configuring
>>> > your
>>> > > > monitoring application?
>>> > > >         >
>>> > > >         > ZTR> I know NETCONF can do both query and =
configuration. And I
>>> > > > know
>>> > > >         > resent YANG-Push improvements to reduce the polling. =
 But
>>> > routing
>>> > > >         > protocol solutions are also widely used for this. =
There are already
>>> > > >         > many RFCs and implementation practices. We =
considered both
>>> > ways,
>>> > > > and
>>> > > >         > aimed for different scenarios.
>>> > > >         >
>>> > > >         > You don't see the major difference between writing a =
YANG model
>>> > vs
>>> > > >         > modifying all of the standard IETF routing =
protocols?
>>> > > >         >
>>> > > >         > ZTR> I know many differences between NETCONF and =
routing
>>> > > > protocol.
>>> > > >         > There are many details on both interfaces, =
implementations,
>>> > scenarios
>>> > > >         > when comparing them. That's what I mean boil the =
ocean.
>>> > > >         > Here I do not know what's the "major difference" you =
mean?
>>> > > >         >
>>> > > >         > Thanks,
>>> > > >         > Chris.
>>> > > >
>>> > > >         _______________________________________________
>>> > > >         Lsr mailing list
>>> > > >         Lsr@ietf.org
>>> > > >         https://www..ietf.org/mailman/listinfo/lsr
>>> > > >
>>> > > >
>>> > > >
>>> > >
>>> > > _______________________________________________
>>> > > Lsr mailing list
>>> > > Lsr@ietf.org
>>> > > https://www.ietf.org/mailman/listinfo/lsr
>>>=20
>>> _______________________________________________
>>> Lsr mailing list
>>> Lsr@ietf.org
>>> https://www.ietf.org/mailman/listinfo/lsr


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References: <1520992FC97B944A9979C2FC1D7DB0F404DB1AD4@dggeml524-mbx.china.huawei.com> <MW3PR11MB4619361A2CA3A402A44914E5C1FE0@MW3PR11MB4619.namprd11.prod.outlook.com> <1520992FC97B944A9979C2FC1D7DB0F404DB2336@dggeml524-mbx.china.huawei.com> <68249E56-5702-4C15-9748-439E43F3EB0E@chopps.org> <1520992FC97B944A9979C2FC1D7DB0F404DEFC14@dggeml524-mbx.china.huawei.com> <A937FECB-2013-403E-89B2-47971514F6CF@chopps.org> <80a8f83c76d447dda48280495b3a80a7@huawei.com> <6F0E8437-5D82-4FAC-A061-69E56E1E161D@chopps.org> <2189e17f36764960bf2dcc554cde9ce0@huawei.com> <MW3PR11MB4619925BEF83B0C4512DD284C1C90@MW3PR11MB4619.namprd11.prod.outlook.com> <06e8443210924ac788c40fa15972cbdd@huawei.com> <C987B657-64D1-4C70-B471-ED9F1266B990@cisco.com> <3948044C-0CC9-4AE8-8541-4D23A5DF396E@cisco.com> <1520992FC97B944A9979C2FC1D7DB0F404DF089E@dggeml524-mbx.china.huawei.com>
In-Reply-To: <1520992FC97B944A9979C2FC1D7DB0F404DF089E@dggeml524-mbx.china.huawei.com>
From: Greg Mirsky <gregimirsky@gmail.com>
Date: Thu, 2 Apr 2020 15:57:32 -0700
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To: wangyali <wangyali11@huawei.com>
Cc: "Acee Lindem (acee)" <acee@cisco.com>, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>,  Christian Hopps <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>, Tianran Zhou <zhoutianran@huawei.com>
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Hi Yali, et al,
thank you for the interesting discussion. I have several questions about
the purpose of advertising ifit capabilities in IGP (and in general):

   - Do you see a capability to export telemetry information as a
   mandatory or optional?
   - Do you expect that a segment route to be constructed to prefer
   ifit-capable nodes comparing to nodes that are not?

Thank you for your kind consideration of my questions.

Regards,
Greg

On Wed, Apr 1, 2020 at 8:13 PM wangyali <wangyali11@huawei.com> wrote:

> Hi Acee, Chris and Les,
>
> This is Yali. Many thanks for your kind comments and suggestion.
>
> Besides of signaling MSD by IGP node CAPABILITY TLV, we learned that
> there's another RFC7883 that advertising S-BFD discriminators in IS-IS. I=
n
> my understand, BFD is a protocol to detect faults in the bidirectional pa=
th
> between two forwarding engines, including interface, data links, etc.
>
> Similarly, IFIT provides a complete framework of a family of on-path
> telemetry techniques, which are used to monitoring performance metrics of
> service flows, e.g. packet loss, delay. So we consider there's a same
> methodology with S-BFD that advertising IFIT node capabilities.
>
> Please let us know your comments and opinion. Thanks.
>
> Best regards,
> Yali
>
> -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
> =E5=8F=91=E4=BB=B6=E4=BA=BA: Acee Lindem (acee) [mailto:acee@cisco.com]
> =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B44=E6=9C=881=E6=97=A5 2=
0:29
> =E6=94=B6=E4=BB=B6=E4=BA=BA: Tianran Zhou <zhoutianran@huawei.com>; Les G=
insberg (ginsberg) <
> ginsberg@cisco.com>; Christian Hopps <chopps@chopps.org>
> =E6=8A=84=E9=80=81: lsr@ietf.org; wangyali <wangyali11@huawei.com>
> =E4=B8=BB=E9=A2=98: Re: [Lsr] A new version of I-D,
> draft-liu-lsr-isis-ifit-node-capability-02
>
> Speak as WG Member...
>
> =EF=BB=BFOn 4/1/20, 8:08 AM, "Acee Lindem (acee)" <acee@cisco.com> wrote:
>
>     There is also a difference between some of the existing applications
> advertised in IGP capabilities. For example, MSD is used with the routing
> information to construct SR paths. The information for all these OAM
> mechanisms doesn't share this affinity. Also, it seems like a slippery
> slope in what is needed for each of the mechanism.
>     Thanks,
>     Acee
>
>     On 4/1/20, 4:01 AM, "Lsr on behalf of Tianran Zhou" <
> lsr-bounces@ietf.org on behalf of zhoutianran@huawei.com> wrote:
>
>         Hi Les,
>
>         Thanks very much for your suggestion. I have a quick look at
> rfc6823. Sounds like a good idea. I will think about it.
>
>         Cheers,
>         Tianran
>
>         -----Original Message-----
>         From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]
>         Sent: Wednesday, April 1, 2020 1:47 PM
>         To: Tianran Zhou <zhoutianran@huawei.com>; Christian Hopps <
> chopps@chopps.org>
>         Cc: wangyali <wangyali11@huawei.com>; lsr@ietf.org
>         Subject: RE: [Lsr] A new version of I-D,
> draft-liu-lsr-isis-ifit-node-capability-02
>
>         Tianran -
>
>         I am very much in agreement with the points Chris has made.
>
>         IGPs do not exist to advertise capabilities/configure application=
s
> - which seems to me to be what you are proposing here.
>         The fact that you can easily define the encodings does not make i=
t
> the right thing to do.
>
>         This issue was discussed at length in the context of
> https://tools.ietf.org/html/rfc6823 . If you were proposing to use GENAPP
> I would not object - though I do think Chris has correctly pointed out th=
at
> NETCONF/YANG is likely a more appropriate solution for your use case.
>
>            Les
>
>
>         > -----Original Message-----
>         > From: Tianran Zhou <zhoutianran@huawei.com>
>         > Sent: Tuesday, March 31, 2020 7:53 PM
>         > To: Christian Hopps <chopps@chopps.org>
>         > Cc: wangyali <wangyali11@huawei.com>; Les Ginsberg (ginsberg)
>         > <ginsberg@cisco.com>; lsr@ietf.org
>         > Subject: RE: [Lsr] A new version of I-D,
>         > draft-liu-lsr-isis-ifit-node-capability-02
>         >
>         > Hi Chris,
>         > Thanks for your quick reply, and please see inline.
>         >
>         > Cheers,
>         > Tianran
>         >
>         > -----Original Message-----
>         > From: Christian Hopps [mailto:chopps@chopps.org]
>         > Sent: Wednesday, April 1, 2020 10:00 AM
>         > To: Tianran Zhou <zhoutianran@huawei.com>
>         > Cc: Christian Hopps <chopps@chopps.org>; wangyali
>         > <wangyali11@huawei.com>; Les Ginsberg (ginsberg) <
> ginsberg@cisco.com>;
>         > lsr@ietf.org
>         > Subject: Re: [Lsr] A new version of I-D,
>         > draft-liu-lsr-isis-ifit-node-capability-02
>         >
>         >
>         >
>         > > On Mar 31, 2020, at 9:28 PM, Tianran Zhou <
> zhoutianran@huawei.com>
>         > wrote:
>         > >
>         > > ZTR> Let's not boil the ocean to compare NETCONF/YANG or
> routing
>         > protocol, which is better. But I did not see the modification t=
o
>         > routing protocol with some TLVs is a heavy work, or more comple=
x
> than
>         > NETCONF/YANG.  I see both are available and useful.
>         >
>         > I'm not sure what you mean by boiling the ocean. I'm saying tha=
t
> YANG
>         > is built and intended for querying capabilities and configuring
>         > routers. Why isn't that where you are looking first for
> configuring your monitoring application?
>         >
>         > ZTR> I know NETCONF can do both query and configuration. And I
> know
>         > resent YANG-Push improvements to reduce the polling.  But
> routing
>         > protocol solutions are also widely used for this. There are
> already
>         > many RFCs and implementation practices. We considered both ways=
,
> and
>         > aimed for different scenarios.
>         >
>         > You don't see the major difference between writing a YANG model
> vs
>         > modifying all of the standard IETF routing protocols?
>         >
>         > ZTR> I know many differences between NETCONF and routing
> protocol.
>         > There are many details on both interfaces, implementations,
> scenarios
>         > when comparing them. That's what I mean boil the ocean.
>         > Here I do not know what's the "major difference" you mean?
>         >
>         > Thanks,
>         > Chris.
>
>         _______________________________________________
>         Lsr mailing list
>         Lsr@ietf.org
>         https://www.ietf.org/mailman/listinfo/lsr
>
>
>
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>

--00000000000089937105a256ba92
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Yali, et al,<div>thank you for the interesting discussi=
on. I have several questions about the purpose of advertising ifit capabili=
ties in IGP (and in general):</div><div><ul><li>Do you see a capability to =
export telemetry information as a mandatory=C2=A0or optional?</li><li>Do yo=
u expect that a segment route to be constructed to prefer ifit-capable node=
s comparing to nodes that are not?</li></ul><div>Thank you for your kind co=
nsideration of my questions.</div></div><div><br></div><div>Regards,</div><=
div>Greg</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=
=3D"gmail_attr">On Wed, Apr 1, 2020 at 8:13 PM wangyali &lt;<a href=3D"mail=
to:wangyali11@huawei.com">wangyali11@huawei.com</a>&gt; wrote:<br></div><bl=
ockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-lef=
t:1px solid rgb(204,204,204);padding-left:1ex">Hi Acee, Chris and Les,<br>
<br>
This is Yali. Many thanks for your kind comments and suggestion. <br>
<br>
Besides of signaling MSD by IGP node CAPABILITY TLV, we learned that there&=
#39;s another RFC7883 that advertising S-BFD discriminators in IS-IS. In my=
 understand, BFD is a protocol to detect faults in the bidirectional path b=
etween two forwarding engines, including interface, data links, etc.<br>
<br>
Similarly, IFIT provides a complete framework of a family of on-path teleme=
try techniques, which are used to monitoring performance metrics of service=
 flows, e.g. packet loss, delay. So we consider there&#39;s a same methodol=
ogy with S-BFD that advertising IFIT node capabilities.<br>
<br>
Please let us know your comments and opinion. Thanks.<br>
<br>
Best regards,<br>
Yali<br>
<br>
-----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----<br>
=E5=8F=91=E4=BB=B6=E4=BA=BA: Acee Lindem (acee) [mailto:<a href=3D"mailto:a=
cee@cisco.com" target=3D"_blank">acee@cisco.com</a>] <br>
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B44=E6=9C=881=E6=97=A5 20:=
29<br>
=E6=94=B6=E4=BB=B6=E4=BA=BA: Tianran Zhou &lt;<a href=3D"mailto:zhoutianran=
@huawei.com" target=3D"_blank">zhoutianran@huawei.com</a>&gt;; Les Ginsberg=
 (ginsberg) &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">gin=
sberg@cisco.com</a>&gt;; Christian Hopps &lt;<a href=3D"mailto:chopps@chopp=
s.org" target=3D"_blank">chopps@chopps.org</a>&gt;<br>
=E6=8A=84=E9=80=81: <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@i=
etf.org</a>; wangyali &lt;<a href=3D"mailto:wangyali11@huawei.com" target=
=3D"_blank">wangyali11@huawei.com</a>&gt;<br>
=E4=B8=BB=E9=A2=98: Re: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit=
-node-capability-02<br>
<br>
Speak as WG Member... <br>
<br>
=EF=BB=BFOn 4/1/20, 8:08 AM, &quot;Acee Lindem (acee)&quot; &lt;<a href=3D"=
mailto:acee@cisco.com" target=3D"_blank">acee@cisco.com</a>&gt; wrote:<br>
<br>
=C2=A0 =C2=A0 There is also a difference between some of the existing appli=
cations advertised in IGP capabilities. For example, MSD is used with the r=
outing information to construct SR paths. The information for all these OAM=
 mechanisms doesn&#39;t share this affinity. Also, it seems like a slippery=
 slope in what is needed for each of the mechanism. <br>
=C2=A0 =C2=A0 Thanks,<br>
=C2=A0 =C2=A0 Acee<br>
<br>
=C2=A0 =C2=A0 On 4/1/20, 4:01 AM, &quot;Lsr on behalf of Tianran Zhou&quot;=
 &lt;<a href=3D"mailto:lsr-bounces@ietf.org" target=3D"_blank">lsr-bounces@=
ietf.org</a> on behalf of <a href=3D"mailto:zhoutianran@huawei.com" target=
=3D"_blank">zhoutianran@huawei.com</a>&gt; wrote:<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Hi Les,<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Thanks very much for your suggestion. I have a =
quick look at rfc6823. Sounds like a good idea. I will think about it.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Cheers,<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Tianran<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 -----Original Message-----<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 From: Les Ginsberg (ginsberg) [mailto:<a href=
=3D"mailto:ginsberg@cisco.com" target=3D"_blank">ginsberg@cisco.com</a>] <b=
r>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Sent: Wednesday, April 1, 2020 1:47 PM<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 To: Tianran Zhou &lt;<a href=3D"mailto:zhoutian=
ran@huawei.com" target=3D"_blank">zhoutianran@huawei.com</a>&gt;; Christian=
 Hopps &lt;<a href=3D"mailto:chopps@chopps.org" target=3D"_blank">chopps@ch=
opps.org</a>&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Cc: wangyali &lt;<a href=3D"mailto:wangyali11@h=
uawei.com" target=3D"_blank">wangyali11@huawei.com</a>&gt;; <a href=3D"mail=
to:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</a><br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Subject: RE: [Lsr] A new version of I-D, draft-=
liu-lsr-isis-ifit-node-capability-02<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Tianran -<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 I am very much in agreement with the points Chr=
is has made.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 IGPs do not exist to advertise capabilities/con=
figure applications - which seems to me to be what you are proposing here.<=
br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 The fact that you can easily define the encodin=
gs does not make it the right thing to do.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 This issue was discussed at length in the conte=
xt of <a href=3D"https://tools.ietf.org/html/rfc6823" rel=3D"noreferrer" ta=
rget=3D"_blank">https://tools.ietf.org/html/rfc6823</a> . If you were propo=
sing to use GENAPP I would not object - though I do think Chris has correct=
ly pointed out that NETCONF/YANG is likely a more appropriate solution for =
your use case.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Les<br>
<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; -----Original Message-----<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; From: Tianran Zhou &lt;<a href=3D"mailto:z=
houtianran@huawei.com" target=3D"_blank">zhoutianran@huawei.com</a>&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; Sent: Tuesday, March 31, 2020 7:53 PM<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; To: Christian Hopps &lt;<a href=3D"mailto:=
chopps@chopps.org" target=3D"_blank">chopps@chopps.org</a>&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; Cc: wangyali &lt;<a href=3D"mailto:wangyal=
i11@huawei.com" target=3D"_blank">wangyali11@huawei.com</a>&gt;; Les Ginsbe=
rg (ginsberg) <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; &lt;<a href=3D"mailto:ginsberg@cisco.com" =
target=3D"_blank">ginsberg@cisco.com</a>&gt;; <a href=3D"mailto:lsr@ietf.or=
g" target=3D"_blank">lsr@ietf.org</a><br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; Subject: RE: [Lsr] A new version of I-D, <=
br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; draft-liu-lsr-isis-ifit-node-capability-02=
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; Hi Chris,<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; Thanks for your quick reply, and please se=
e inline.<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; Cheers,<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; Tianran<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; -----Original Message-----<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; From: Christian Hopps [mailto:<a href=3D"m=
ailto:chopps@chopps.org" target=3D"_blank">chopps@chopps.org</a>]<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; Sent: Wednesday, April 1, 2020 10:00 AM<br=
>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; To: Tianran Zhou &lt;<a href=3D"mailto:zho=
utianran@huawei.com" target=3D"_blank">zhoutianran@huawei.com</a>&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; Cc: Christian Hopps &lt;<a href=3D"mailto:=
chopps@chopps.org" target=3D"_blank">chopps@chopps.org</a>&gt;; wangyali <b=
r>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; &lt;<a href=3D"mailto:wangyali11@huawei.co=
m" target=3D"_blank">wangyali11@huawei.com</a>&gt;; Les Ginsberg (ginsberg)=
 &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">ginsberg@cisco=
.com</a>&gt;; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <a href=3D"mailto:lsr@ietf.org" target=3D"=
_blank">lsr@ietf.org</a><br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; Subject: Re: [Lsr] A new version of I-D, <=
br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; draft-liu-lsr-isis-ifit-node-capability-02=
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; &gt; On Mar 31, 2020, at 9:28 PM, Tianran =
Zhou &lt;<a href=3D"mailto:zhoutianran@huawei.com" target=3D"_blank">zhouti=
anran@huawei.com</a>&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; wrote:<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; &gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; &gt; ZTR&gt; Let&#39;s not boil the ocean =
to compare NETCONF/YANG or routing<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; protocol, which is better. But I did not s=
ee the modification to <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; routing protocol with some TLVs is a heavy=
 work, or more complex than <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; NETCONF/YANG.=C2=A0 I see both are availab=
le and useful.<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; I&#39;m not sure what you mean by boiling =
the ocean. I&#39;m saying that YANG <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; is built and intended for querying capabil=
ities and configuring <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; routers. Why isn&#39;t that where you are =
looking first for configuring your monitoring application?<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; ZTR&gt; I know NETCONF can do both query a=
nd configuration. And I know<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; resent YANG-Push improvements to reduce th=
e polling.=C2=A0 But routing <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; protocol solutions are also widely used fo=
r this. There are already <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; many RFCs and implementation practices. We=
 considered both ways, and <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; aimed for different scenarios.<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; You don&#39;t see the major difference bet=
ween writing a YANG model vs <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; modifying all of the standard IETF routing=
 protocols?<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; ZTR&gt; I know many differences between NE=
TCONF and routing protocol.<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; There are many details on both interfaces,=
 implementations, scenarios <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; when comparing them. That&#39;s what I mea=
n boil the ocean.<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; Here I do not know what&#39;s the &quot;ma=
jor difference&quot; you mean?<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; Thanks,<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; Chris.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 _______________________________________________=
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Lsr mailing list<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <a href=3D"mailto:Lsr@ietf.org" target=3D"_blan=
k">Lsr@ietf.org</a><br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 <a href=3D"https://www.ietf.org/mailman/listinf=
o/lsr" rel=3D"noreferrer" target=3D"_blank">https://www.ietf.org/mailman/li=
stinfo/lsr</a><br>
<br>
<br>
<br>
<br>
_______________________________________________<br>
Lsr mailing list<br>
<a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
</blockquote></div>

--00000000000089937105a256ba92--


From nobody Thu Apr  2 15:59:27 2020
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To: Robert Raszuk <robert@raszuk.net>
Cc: "lsr@ietf.org" <lsr@ietf.org>
References: <1520992FC97B944A9979C2FC1D7DB0F404DB1AD4@dggeml524-mbx.china.huawei.com> <MW3PR11MB4619925BEF83B0C4512DD284C1C90@MW3PR11MB4619.namprd11.prod.outlook.com> <06e8443210924ac788c40fa15972cbdd@huawei.com> <C987B657-64D1-4C70-B471-ED9F1266B990@cisco.com> <3948044C-0CC9-4AE8-8541-4D23A5DF396E@cisco.com> <1520992FC97B944A9979C2FC1D7DB0F404DF089E@dggeml524-mbx.china.huawei.com> <MW3PR11MB46197F8C43B3200B07641838C1C60@MW3PR11MB4619.namprd11.prod.outlook.com> <CAOj+MMGsVkws0sTw4RRdb_SdWvsuh+2Dxc-upXqT2_pmpO_+Lg@mail.gmail.com> <6930807B-2FF0-4A5C-AD39-D05345C37A5E@chopps.org> <MW3PR11MB461955420610E933ACC44BC4C1C60@MW3PR11MB4619.namprd11.prod.outlook.com> <CAOj+MMHoTbDzZrA1ttPsdD5Tk7TADaR=ex5WGF=6+X3X1utoHg@mail.gmail.com> <bd193457-956c-47b0-a50b-8d1778e8349a@Spark> <CAOj+MMGuRHVoJ3ez4nQ3O87J4U+-+yabYWeA1AEfj1UGAbPp7w@mail.gmail.com> <DD4DAC78-3A51-4E8D-802B-9FB515F86AF1@chopps.org> <CAOj+MMHa4J-619P6TWjSohB4yP3O5VPaq42VuAzNUmzbXsFcfA@mail.gmail.com>
From: "Joel M. Halpern" <jmh@joelhalpern.com>
Message-ID: <4dcafca3-9211-e185-cd69-609cc6cb606f@joelhalpern.com>
Date: Thu, 2 Apr 2020 18:59:19 -0400
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/gBGHXLDn9PrY9HzOkPf2C00EcZA>
Subject: Re: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
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Robert, you seem to be asking that we pass full information about the 
dynamic network state to all routers so that they can, if needed, serve 
as fully intelligent path computation engines.  If you want to do that, 
you will need more than just the telemetry.  You will need the demands 
that are coming in to all of those routers, so that you can make global 
decisions sensibly.
Which is why we use quasi-centralized path computation engines.

Yours,
Joel

On 4/2/2020 6:16 PM, Robert Raszuk wrote:
> 
>      > If you consider such constrains to provide reachability for
>     applications you will likely see value that in-situ telemetry is
>     your friend here. Really best friend as without him you can not do
>     the proper end to end path exclusion for SPT computations..
> 
>     [as wg member] Are you thinking that shifting traffic to a router is
>     not going to affect it's jitter/drop rate?
> 
> 
> Well this is actually the other way around.
> 
> First you have your default topology. They you are asked to 
> construct new one based on applied constrains.
> 
> So you create complete TE coverage and start running end to end data 
> plane probing over all TE paths (say SR-TE for specific example). Once 
> you start collecting the probe results you can start excluding paths 
> which do not meet your applied constraints. And that process continues.
> 
> To your specific question - It is not that unusual where routers degrade 
> their performance with time and in many cases the traffic is not the 
> cause for it but internal bugs and malfunctions.
> 
> Best,
> R.
> 
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
> 


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References: <1520992FC97B944A9979C2FC1D7DB0F404DB1AD4@dggeml524-mbx.china.huawei.com> <MW3PR11MB4619925BEF83B0C4512DD284C1C90@MW3PR11MB4619.namprd11.prod.outlook.com> <06e8443210924ac788c40fa15972cbdd@huawei.com> <C987B657-64D1-4C70-B471-ED9F1266B990@cisco.com> <3948044C-0CC9-4AE8-8541-4D23A5DF396E@cisco.com> <1520992FC97B944A9979C2FC1D7DB0F404DF089E@dggeml524-mbx.china.huawei.com> <MW3PR11MB46197F8C43B3200B07641838C1C60@MW3PR11MB4619.namprd11.prod.outlook.com> <CAOj+MMGsVkws0sTw4RRdb_SdWvsuh+2Dxc-upXqT2_pmpO_+Lg@mail.gmail.com> <6930807B-2FF0-4A5C-AD39-D05345C37A5E@chopps.org> <MW3PR11MB461955420610E933ACC44BC4C1C60@MW3PR11MB4619.namprd11.prod.outlook.com> <CAOj+MMHoTbDzZrA1ttPsdD5Tk7TADaR=ex5WGF=6+X3X1utoHg@mail.gmail.com> <bd193457-956c-47b0-a50b-8d1778e8349a@Spark> <CAOj+MMGuRHVoJ3ez4nQ3O87J4U+-+yabYWeA1AEfj1UGAbPp7w@mail.gmail.com> <DD4DAC78-3A51-4E8D-802B-9FB515F86AF1@chopps.org> <CAOj+MMHa4J-619P6TWjSohB4yP3O5VPaq42VuAzNUmzbXsFcfA@mail.gmail.com> <4dcafca3-9211-e185-cd69-609cc6cb606f@joelhalpern.com>
In-Reply-To: <4dcafca3-9211-e185-cd69-609cc6cb606f@joelhalpern.com>
From: Robert Raszuk <robert@raszuk.net>
Date: Fri, 3 Apr 2020 01:03:23 +0200
Message-ID: <CAOj+MMGSjb2Medd_wkV314pYrm_96GD5urxw5Qs34hMZt5BXMw@mail.gmail.com>
To: "Joel M. Halpern" <jmh@joelhalpern.com>
Cc: "lsr@ietf.org" <lsr@ietf.org>
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Subject: Re: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
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Hi Joel,

> Robert, you seem to be asking that we pass full information about the
> dynamic network state to all routers

No not at all.

Only TE headends need this information.

To restate ... I am not asking to have a synchronized input to all routes
in the domain such that their computation would be consistent.

I am only asking for TE headends to be able to select end to end paths
based on the end to end inband telemetry data. I find this a useful
requirement missing from any of today's operational deployments.

Many thx,
R.






On Fri, Apr 3, 2020 at 12:59 AM Joel M. Halpern <jmh@joelhalpern.com> wrote:

> Robert, you seem to be asking that we pass full information about the
> dynamic network state to all routers so that they can, if needed, serve
> as fully intelligent path computation engines.  If you want to do that,
> you will need more than just the telemetry.  You will need the demands
> that are coming in to all of those routers, so that you can make global
> decisions sensibly.
> Which is why we use quasi-centralized path computation engines.
>
> Yours,
> Joel
>
> On 4/2/2020 6:16 PM, Robert Raszuk wrote:
> >
> >      > If you consider such constrains to provide reachability for
> >     applications you will likely see value that in-situ telemetry is
> >     your friend here. Really best friend as without him you can not do
> >     the proper end to end path exclusion for SPT computations..
> >
> >     [as wg member] Are you thinking that shifting traffic to a router is
> >     not going to affect it's jitter/drop rate?
> >
> >
> > Well this is actually the other way around.
> >
> > First you have your default topology. They you are asked to
> > construct new one based on applied constrains.
> >
> > So you create complete TE coverage and start running end to end data
> > plane probing over all TE paths (say SR-TE for specific example). Once
> > you start collecting the probe results you can start excluding paths
> > which do not meet your applied constraints. And that process continues.
> >
> > To your specific question - It is not that unusual where routers degrade
> > their performance with time and in many cases the traffic is not the
> > cause for it but internal bugs and malfunctions.
> >
> > Best,
> > R.
> >
> > _______________________________________________
> > Lsr mailing list
> > Lsr@ietf.org
> > https://www.ietf.org/mailman/listinfo/lsr
> >
>

--00000000000058048105a256cf13
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Joel,<div><br></div><div>&gt; Robert, you seem to be as=
king that we pass full information about the<br>&gt; dynamic network state =
to all routers=C2=A0=C2=A0<br></div><div><br></div><div>No not at all.=C2=
=A0</div><div><br></div><div>Only TE headends=C2=A0need this information.=
=C2=A0</div><div><br></div><div>To restate ... I am not asking to have a sy=
nchronized input to all routes in the domain such that their computation wo=
uld be consistent.=C2=A0</div><div><br></div><div>I am only asking for TE h=
eadends=C2=A0to be able to select end to end paths based on the end to end =
inband telemetry data. I find this a useful requirement missing from any of=
 today&#39;s operational=C2=A0deployments.=C2=A0</div><div><br></div><div>M=
any thx,<br>R.=C2=A0</div><div><br></div><div><br></div><div><br></div><div=
><br></div><div><br></div></div><br><div class=3D"gmail_quote"><div dir=3D"=
ltr" class=3D"gmail_attr">On Fri, Apr 3, 2020 at 12:59 AM Joel M. Halpern &=
lt;<a href=3D"mailto:jmh@joelhalpern.com">jmh@joelhalpern.com</a>&gt; wrote=
:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.=
8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Robert, you se=
em to be asking that we pass full information about the <br>
dynamic network state to all routers so that they can, if needed, serve <br=
>
as fully intelligent path computation engines.=C2=A0 If you want to do that=
, <br>
you will need more than just the telemetry.=C2=A0 You will need the demands=
 <br>
that are coming in to all of those routers, so that you can make global <br=
>
decisions sensibly.<br>
Which is why we use quasi-centralized path computation engines.<br>
<br>
Yours,<br>
Joel<br>
<br>
On 4/2/2020 6:16 PM, Robert Raszuk wrote:<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt; If you consider such constrains to provide re=
achability for<br>
&gt;=C2=A0 =C2=A0 =C2=A0applications you will likely see value that in-situ=
 telemetry is<br>
&gt;=C2=A0 =C2=A0 =C2=A0your friend here. Really best friend as without him=
 you can not do<br>
&gt;=C2=A0 =C2=A0 =C2=A0the proper end to end path exclusion for SPT comput=
ations..<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0[as wg member] Are you thinking that shifting traff=
ic to a router is<br>
&gt;=C2=A0 =C2=A0 =C2=A0not going to affect it&#39;s jitter/drop rate?<br>
&gt; <br>
&gt; <br>
&gt; Well this is actually the other way around.<br>
&gt; <br>
&gt; First you have your default topology. They you are asked to <br>
&gt; construct=C2=A0new one based on applied constrains.<br>
&gt; <br>
&gt; So you create complete TE coverage and start running end to end data <=
br>
&gt; plane probing over all TE paths=C2=A0(say SR-TE for specific=C2=A0exam=
ple). Once <br>
&gt; you start collecting the probe results you can start excluding=C2=A0pa=
ths <br>
&gt; which do not meet your applied constraints. And that process continues=
.<br>
&gt; <br>
&gt; To your specific question - It is not that unusual where routers degra=
de <br>
&gt; their performance=C2=A0with time and in many cases the traffic is not =
the <br>
&gt; cause for it but internal bugs and malfunctions.<br>
&gt; <br>
&gt; Best,<br>
&gt; R.<br>
&gt; <br>
&gt; _______________________________________________<br>
&gt; Lsr mailing list<br>
&gt; <a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferre=
r" target=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
&gt; <br>
</blockquote></div>

--00000000000058048105a256cf13--


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References: <1520992FC97B944A9979C2FC1D7DB0F404DB1AD4@dggeml524-mbx.china.huawei.com> <MW3PR11MB4619925BEF83B0C4512DD284C1C90@MW3PR11MB4619.namprd11.prod.outlook.com> <06e8443210924ac788c40fa15972cbdd@huawei.com> <C987B657-64D1-4C70-B471-ED9F1266B990@cisco.com> <3948044C-0CC9-4AE8-8541-4D23A5DF396E@cisco.com> <1520992FC97B944A9979C2FC1D7DB0F404DF089E@dggeml524-mbx.china.huawei.com> <MW3PR11MB46197F8C43B3200B07641838C1C60@MW3PR11MB4619.namprd11.prod.outlook.com> <CAOj+MMGsVkws0sTw4RRdb_SdWvsuh+2Dxc-upXqT2_pmpO_+Lg@mail.gmail.com> <6930807B-2FF0-4A5C-AD39-D05345C37A5E@chopps.org> <MW3PR11MB461955420610E933ACC44BC4C1C60@MW3PR11MB4619.namprd11.prod.outlook.com> <CAOj+MMHoTbDzZrA1ttPsdD5Tk7TADaR=ex5WGF=6+X3X1utoHg@mail.gmail.com> <bd193457-956c-47b0-a50b-8d1778e8349a@Spark> <CAOj+MMGuRHVoJ3ez4nQ3O87J4U+-+yabYWeA1AEfj1UGAbPp7w@mail.gmail.com> <DD4DAC78-3A51-4E8D-802B-9FB515F86AF1@chopps.org> <CAOj+MMHa4J-619P6TWjSohB4yP3O5VPaq42VuAzNUmzbXsFcfA@mail.gmail.com> <4dcafca3-9211-e185-cd69-609cc6cb606f@joelhalpern.com> <CAOj+MMGSjb2Medd_wkV314pYrm_96GD5urxw5Qs34hMZt5BXMw@mail.gmail.com>
In-Reply-To: <CAOj+MMGSjb2Medd_wkV314pYrm_96GD5urxw5Qs34hMZt5BXMw@mail.gmail.com>
From: Greg Mirsky <gregimirsky@gmail.com>
Date: Thu, 2 Apr 2020 16:08:44 -0700
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To: Robert Raszuk <robert@raszuk.net>
Cc: "Joel M. Halpern" <jmh@joelhalpern.com>, "lsr@ietf.org" <lsr@ietf.org>
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Subject: Re: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
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--00000000000087856305a256e2ca
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Hi Robert,
I think that there's no apparent requirement to collect performance
information form each node in the network in order to select a path with
bounded delay and packet loss. Would you agree?

Regards,
Greg

On Thu, Apr 2, 2020 at 4:03 PM Robert Raszuk <robert@raszuk.net> wrote:

> Hi Joel,
>
> > Robert, you seem to be asking that we pass full information about the
> > dynamic network state to all routers
>
> No not at all.
>
> Only TE headends need this information.
>
> To restate ... I am not asking to have a synchronized input to all routes
> in the domain such that their computation would be consistent.
>
> I am only asking for TE headends to be able to select end to end paths
> based on the end to end inband telemetry data. I find this a useful
> requirement missing from any of today's operational deployments.
>
> Many thx,
> R.
>
>
>
>
>
>
> On Fri, Apr 3, 2020 at 12:59 AM Joel M. Halpern <jmh@joelhalpern.com>
> wrote:
>
>> Robert, you seem to be asking that we pass full information about the
>> dynamic network state to all routers so that they can, if needed, serve
>> as fully intelligent path computation engines.  If you want to do that,
>> you will need more than just the telemetry.  You will need the demands
>> that are coming in to all of those routers, so that you can make global
>> decisions sensibly.
>> Which is why we use quasi-centralized path computation engines.
>>
>> Yours,
>> Joel
>>
>> On 4/2/2020 6:16 PM, Robert Raszuk wrote:
>> >
>> >      > If you consider such constrains to provide reachability for
>> >     applications you will likely see value that in-situ telemetry is
>> >     your friend here. Really best friend as without him you can not do
>> >     the proper end to end path exclusion for SPT computations..
>> >
>> >     [as wg member] Are you thinking that shifting traffic to a router is
>> >     not going to affect it's jitter/drop rate?
>> >
>> >
>> > Well this is actually the other way around.
>> >
>> > First you have your default topology. They you are asked to
>> > construct new one based on applied constrains.
>> >
>> > So you create complete TE coverage and start running end to end data
>> > plane probing over all TE paths (say SR-TE for specific example). Once
>> > you start collecting the probe results you can start excluding paths
>> > which do not meet your applied constraints. And that process continues..
>> >
>> > To your specific question - It is not that unusual where routers
>> degrade
>> > their performance with time and in many cases the traffic is not the
>> > cause for it but internal bugs and malfunctions.
>> >
>> > Best,
>> > R.
>> >
>> > _______________________________________________
>> > Lsr mailing list
>> > Lsr@ietf.org
>> > https://www.ietf.org/mailman/listinfo/lsr
>> >
>>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>

--00000000000087856305a256e2ca
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Robert,<div>I think that there&#39;s no apparent requir=
ement to collect performance information form each node in the network in o=
rder to select a path with bounded delay and packet loss. Would you agree?<=
/div><div><br></div><div>Regards,</div><div>Greg</div></div><br><div class=
=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, Apr 2, 2020 =
at 4:03 PM Robert Raszuk &lt;<a href=3D"mailto:robert@raszuk.net">robert@ra=
szuk.net</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D=
"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-le=
ft:1ex"><div dir=3D"ltr">Hi Joel,<div><br></div><div>&gt; Robert, you seem =
to be asking that we pass full information about the<br>&gt; dynamic networ=
k state to all routers=C2=A0=C2=A0<br></div><div><br></div><div>No not at a=
ll.=C2=A0</div><div><br></div><div>Only TE headends=C2=A0need this informat=
ion.=C2=A0</div><div><br></div><div>To restate ... I am not asking to have =
a synchronized input to all routes in the domain such that their computatio=
n would be consistent.=C2=A0</div><div><br></div><div>I am only asking for =
TE headends=C2=A0to be able to select end to end paths based on the end to =
end inband telemetry data. I find this a useful requirement missing from an=
y of today&#39;s operational=C2=A0deployments.=C2=A0</div><div><br></div><d=
iv>Many thx,<br>R.=C2=A0</div><div><br></div><div><br></div><div><br></div>=
<div><br></div><div><br></div></div><br><div class=3D"gmail_quote"><div dir=
=3D"ltr" class=3D"gmail_attr">On Fri, Apr 3, 2020 at 12:59 AM Joel M. Halpe=
rn &lt;<a href=3D"mailto:jmh@joelhalpern.com" target=3D"_blank">jmh@joelhal=
pern.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D=
"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-le=
ft:1ex">Robert, you seem to be asking that we pass full information about t=
he <br>
dynamic network state to all routers so that they can, if needed, serve <br=
>
as fully intelligent path computation engines.=C2=A0 If you want to do that=
, <br>
you will need more than just the telemetry.=C2=A0 You will need the demands=
 <br>
that are coming in to all of those routers, so that you can make global <br=
>
decisions sensibly.<br>
Which is why we use quasi-centralized path computation engines.<br>
<br>
Yours,<br>
Joel<br>
<br>
On 4/2/2020 6:16 PM, Robert Raszuk wrote:<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt; If you consider such constrains to provide re=
achability for<br>
&gt;=C2=A0 =C2=A0 =C2=A0applications you will likely see value that in-situ=
 telemetry is<br>
&gt;=C2=A0 =C2=A0 =C2=A0your friend here. Really best friend as without him=
 you can not do<br>
&gt;=C2=A0 =C2=A0 =C2=A0the proper end to end path exclusion for SPT comput=
ations..<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0[as wg member] Are you thinking that shifting traff=
ic to a router is<br>
&gt;=C2=A0 =C2=A0 =C2=A0not going to affect it&#39;s jitter/drop rate?<br>
&gt; <br>
&gt; <br>
&gt; Well this is actually the other way around.<br>
&gt; <br>
&gt; First you have your default topology. They you are asked to <br>
&gt; construct=C2=A0new one based on applied constrains.<br>
&gt; <br>
&gt; So you create complete TE coverage and start running end to end data <=
br>
&gt; plane probing over all TE paths=C2=A0(say SR-TE for specific=C2=A0exam=
ple). Once <br>
&gt; you start collecting the probe results you can start excluding=C2=A0pa=
ths <br>
&gt; which do not meet your applied constraints. And that process continues=
..<br>
&gt; <br>
&gt; To your specific question - It is not that unusual where routers degra=
de <br>
&gt; their performance=C2=A0with time and in many cases the traffic is not =
the <br>
&gt; cause for it but internal bugs and malfunctions.<br>
&gt; <br>
&gt; Best,<br>
&gt; R.<br>
&gt; <br>
&gt; _______________________________________________<br>
&gt; Lsr mailing list<br>
&gt; <a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferre=
r" target=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
&gt; <br>
</blockquote></div>
_______________________________________________<br>
Lsr mailing list<br>
<a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
</blockquote></div>

--00000000000087856305a256e2ca--


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From: Robert Raszuk <robert@raszuk.net>
Date: Fri, 3 Apr 2020 01:11:48 +0200
Message-ID: <CAOj+MMG=OsTDiMn1X2+dzKRrwdyUpSCuUhwhykGHe-0-mX0iaA@mail.gmail.com>
To: Greg Mirsky <gregimirsky@gmail.com>
Cc: "Joel M. Halpern" <jmh@joelhalpern.com>, "lsr@ietf.org" <lsr@ietf.org>
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Subject: Re: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
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--000000000000741e0005a256ed8e
Content-Type: text/plain; charset="UTF-8"

Hi Greg,

That is 100% correct. That in fact goes well against the main principle of
end to end path based measurements in the data plane.

Collecting information by all nodes would inherently not include their own
forwarding characteristics so in my books is of very marginal use.

Thx,
R.


On Fri, Apr 3, 2020 at 1:08 AM Greg Mirsky <gregimirsky@gmail.com> wrote:

> Hi Robert,
> I think that there's no apparent requirement to collect performance
> information form each node in the network in order to select a path with
> bounded delay and packet loss. Would you agree?
>
> Regards,
> Greg
>
> On Thu, Apr 2, 2020 at 4:03 PM Robert Raszuk <robert@raszuk.net> wrote:
>
>> Hi Joel,
>>
>> > Robert, you seem to be asking that we pass full information about the
>> > dynamic network state to all routers
>>
>> No not at all.
>>
>> Only TE headends need this information.
>>
>> To restate ... I am not asking to have a synchronized input to all routes
>> in the domain such that their computation would be consistent.
>>
>> I am only asking for TE headends to be able to select end to end paths
>> based on the end to end inband telemetry data. I find this a useful
>> requirement missing from any of today's operational deployments.
>>
>> Many thx,
>> R.
>>
>>
>>
>>
>>
>>
>> On Fri, Apr 3, 2020 at 12:59 AM Joel M. Halpern <jmh@joelhalpern.com>
>> wrote:
>>
>>> Robert, you seem to be asking that we pass full information about the
>>> dynamic network state to all routers so that they can, if needed, serve
>>> as fully intelligent path computation engines.  If you want to do that,
>>> you will need more than just the telemetry.  You will need the demands
>>> that are coming in to all of those routers, so that you can make global
>>> decisions sensibly.
>>> Which is why we use quasi-centralized path computation engines.
>>>
>>> Yours,
>>> Joel
>>>
>>> On 4/2/2020 6:16 PM, Robert Raszuk wrote:
>>> >
>>> >      > If you consider such constrains to provide reachability for
>>> >     applications you will likely see value that in-situ telemetry is
>>> >     your friend here. Really best friend as without him you can not do
>>> >     the proper end to end path exclusion for SPT computations..
>>> >
>>> >     [as wg member] Are you thinking that shifting traffic to a router
>>> is
>>> >     not going to affect it's jitter/drop rate?
>>> >
>>> >
>>> > Well this is actually the other way around.
>>> >
>>> > First you have your default topology. They you are asked to
>>> > construct new one based on applied constrains.
>>> >
>>> > So you create complete TE coverage and start running end to end data
>>> > plane probing over all TE paths (say SR-TE for specific example). Once
>>> > you start collecting the probe results you can start excluding paths
>>> > which do not meet your applied constraints. And that process
>>> continues..
>>> >
>>> > To your specific question - It is not that unusual where routers
>>> degrade
>>> > their performance with time and in many cases the traffic is not the
>>> > cause for it but internal bugs and malfunctions.
>>> >
>>> > Best,
>>> > R.
>>> >
>>> > _______________________________________________
>>> > Lsr mailing list
>>> > Lsr@ietf.org
>>> > https://www.ietf.org/mailman/listinfo/lsr
>>> >
>>>
>> _______________________________________________
>> Lsr mailing list
>> Lsr@ietf.org
>> https://www.ietf.org/mailman/listinfo/lsr
>>
>

--000000000000741e0005a256ed8e
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Hi Greg,</div><div><br></div>That is 100% correct. Th=
at in fact goes well against the main principle of end to end path based me=
asurements in the data plane.=C2=A0<div><br></div><div>Collecting informati=
on by all nodes would inherently not include their own forwarding character=
istics so=C2=A0in my books is of very=C2=A0marginal=C2=A0use.=C2=A0=C2=A0</=
div><div><br></div><div>Thx,</div><div>R.</div><div><br></div></div><br><di=
v class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, Apr 3=
, 2020 at 1:08 AM Greg Mirsky &lt;<a href=3D"mailto:gregimirsky@gmail.com">=
gregimirsky@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_qu=
ote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,20=
4);padding-left:1ex"><div dir=3D"ltr">Hi Robert,<div>I think that there&#39=
;s no apparent requirement to collect performance information form each nod=
e in the network in order to select a path with bounded delay and packet lo=
ss. Would you agree?</div><div><br></div><div>Regards,</div><div>Greg</div>=
</div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">=
On Thu, Apr 2, 2020 at 4:03 PM Robert Raszuk &lt;<a href=3D"mailto:robert@r=
aszuk.net" target=3D"_blank">robert@raszuk.net</a>&gt; wrote:<br></div><blo=
ckquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left=
:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr">Hi Joel,<div=
><br></div><div>&gt; Robert, you seem to be asking that we pass full inform=
ation about the<br>&gt; dynamic network state to all routers=C2=A0=C2=A0<br=
></div><div><br></div><div>No not at all.=C2=A0</div><div><br></div><div>On=
ly TE headends=C2=A0need this information.=C2=A0</div><div><br></div><div>T=
o restate ... I am not asking to have a synchronized input to all routes in=
 the domain such that their computation would be consistent.=C2=A0</div><di=
v><br></div><div>I am only asking for TE headends=C2=A0to be able to select=
 end to end paths based on the end to end inband telemetry data. I find thi=
s a useful requirement missing from any of today&#39;s operational=C2=A0dep=
loyments.=C2=A0</div><div><br></div><div>Many thx,<br>R.=C2=A0</div><div><b=
r></div><div><br></div><div><br></div><div><br></div><div><br></div></div><=
br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri,=
 Apr 3, 2020 at 12:59 AM Joel M. Halpern &lt;<a href=3D"mailto:jmh@joelhalp=
ern.com" target=3D"_blank">jmh@joelhalpern.com</a>&gt; wrote:<br></div><blo=
ckquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left=
:1px solid rgb(204,204,204);padding-left:1ex">Robert, you seem to be asking=
 that we pass full information about the <br>
dynamic network state to all routers so that they can, if needed, serve <br=
>
as fully intelligent path computation engines.=C2=A0 If you want to do that=
, <br>
you will need more than just the telemetry.=C2=A0 You will need the demands=
 <br>
that are coming in to all of those routers, so that you can make global <br=
>
decisions sensibly.<br>
Which is why we use quasi-centralized path computation engines.<br>
<br>
Yours,<br>
Joel<br>
<br>
On 4/2/2020 6:16 PM, Robert Raszuk wrote:<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt; If you consider such constrains to provide re=
achability for<br>
&gt;=C2=A0 =C2=A0 =C2=A0applications you will likely see value that in-situ=
 telemetry is<br>
&gt;=C2=A0 =C2=A0 =C2=A0your friend here. Really best friend as without him=
 you can not do<br>
&gt;=C2=A0 =C2=A0 =C2=A0the proper end to end path exclusion for SPT comput=
ations..<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0[as wg member] Are you thinking that shifting traff=
ic to a router is<br>
&gt;=C2=A0 =C2=A0 =C2=A0not going to affect it&#39;s jitter/drop rate?<br>
&gt; <br>
&gt; <br>
&gt; Well this is actually the other way around.<br>
&gt; <br>
&gt; First you have your default topology. They you are asked to <br>
&gt; construct=C2=A0new one based on applied constrains.<br>
&gt; <br>
&gt; So you create complete TE coverage and start running end to end data <=
br>
&gt; plane probing over all TE paths=C2=A0(say SR-TE for specific=C2=A0exam=
ple). Once <br>
&gt; you start collecting the probe results you can start excluding=C2=A0pa=
ths <br>
&gt; which do not meet your applied constraints. And that process continues=
..<br>
&gt; <br>
&gt; To your specific question - It is not that unusual where routers degra=
de <br>
&gt; their performance=C2=A0with time and in many cases the traffic is not =
the <br>
&gt; cause for it but internal bugs and malfunctions.<br>
&gt; <br>
&gt; Best,<br>
&gt; R.<br>
&gt; <br>
&gt; _______________________________________________<br>
&gt; Lsr mailing list<br>
&gt; <a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferre=
r" target=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
&gt; <br>
</blockquote></div>
_______________________________________________<br>
Lsr mailing list<br>
<a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
</blockquote></div>
</blockquote></div>

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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Thu, 2 Apr 2020 16:13:32 -0700
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To: Robert Raszuk <robert@raszuk.net>
Cc: "Joel M. Halpern" <jmh@joelhalpern.com>, "lsr@ietf.org" <lsr@ietf.org>
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Subject: Re: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
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And another note regarding the use of on-path collected telemetry
information. I'd point that that information is collected only on active
paths. Thus it characterizes the conditions experienced by already existing
flows. Hence it might not be related to a path that the system intends to
instantiate. One needs active OAM to collect such information.

Regards,
Greg

On Thu, Apr 2, 2020 at 4:08 PM Greg Mirsky <gregimirsky@gmail.com> wrote:

> Hi Robert,
> I think that there's no apparent requirement to collect performance
> information form each node in the network in order to select a path with
> bounded delay and packet loss. Would you agree?
>
> Regards,
> Greg
>
> On Thu, Apr 2, 2020 at 4:03 PM Robert Raszuk <robert@raszuk.net> wrote:
>
>> Hi Joel,
>>
>> > Robert, you seem to be asking that we pass full information about the
>> > dynamic network state to all routers
>>
>> No not at all.
>>
>> Only TE headends need this information.
>>
>> To restate ... I am not asking to have a synchronized input to all routes
>> in the domain such that their computation would be consistent.
>>
>> I am only asking for TE headends to be able to select end to end paths
>> based on the end to end inband telemetry data. I find this a useful
>> requirement missing from any of today's operational deployments.
>>
>> Many thx,
>> R.
>>
>>
>>
>>
>>
>>
>> On Fri, Apr 3, 2020 at 12:59 AM Joel M. Halpern <jmh@joelhalpern.com>
>> wrote:
>>
>>> Robert, you seem to be asking that we pass full information about the
>>> dynamic network state to all routers so that they can, if needed, serve
>>> as fully intelligent path computation engines.  If you want to do that,
>>> you will need more than just the telemetry.  You will need the demands
>>> that are coming in to all of those routers, so that you can make global
>>> decisions sensibly.
>>> Which is why we use quasi-centralized path computation engines.
>>>
>>> Yours,
>>> Joel
>>>
>>> On 4/2/2020 6:16 PM, Robert Raszuk wrote:
>>> >
>>> >      > If you consider such constrains to provide reachability for
>>> >     applications you will likely see value that in-situ telemetry is
>>> >     your friend here. Really best friend as without him you can not do
>>> >     the proper end to end path exclusion for SPT computations..
>>> >
>>> >     [as wg member] Are you thinking that shifting traffic to a router
>>> is
>>> >     not going to affect it's jitter/drop rate?
>>> >
>>> >
>>> > Well this is actually the other way around.
>>> >
>>> > First you have your default topology. They you are asked to
>>> > construct new one based on applied constrains.
>>> >
>>> > So you create complete TE coverage and start running end to end data
>>> > plane probing over all TE paths (say SR-TE for specific example). Once
>>> > you start collecting the probe results you can start excluding paths
>>> > which do not meet your applied constraints. And that process
>>> continues..
>>> >
>>> > To your specific question - It is not that unusual where routers
>>> degrade
>>> > their performance with time and in many cases the traffic is not the
>>> > cause for it but internal bugs and malfunctions.
>>> >
>>> > Best,
>>> > R.
>>> >
>>> > _______________________________________________
>>> > Lsr mailing list
>>> > Lsr@ietf.org
>>> > https://www.ietf.org/mailman/listinfo/lsr
>>> >
>>>
>> _______________________________________________
>> Lsr mailing list
>> Lsr@ietf.org
>> https://www.ietf.org/mailman/listinfo/lsr
>>
>

--000000000000b6d0fa05a256f3e9
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<div dir=3D"ltr">And another note regarding the use of on-path collected te=
lemetry information. I&#39;d point that that information is collected only =
on active paths. Thus it characterizes the conditions experienced by alread=
y existing flows. Hence it might not be related to a path that the system i=
ntends to instantiate. One needs active OAM to collect such information.<di=
v><br></div><div>Regards,</div><div>Greg</div></div><br><div class=3D"gmail=
_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, Apr 2, 2020 at 4:08 P=
M Greg Mirsky &lt;<a href=3D"mailto:gregimirsky@gmail.com">gregimirsky@gmai=
l.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"ma=
rgin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:=
1ex"><div dir=3D"ltr">Hi Robert,<div>I think that there&#39;s no apparent r=
equirement to collect performance information form each node in the network=
 in order to select a path with bounded delay and packet loss. Would you ag=
ree?</div><div><br></div><div>Regards,</div><div>Greg</div></div><br><div c=
lass=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, Apr 2, 2=
020 at 4:03 PM Robert Raszuk &lt;<a href=3D"mailto:robert@raszuk.net" targe=
t=3D"_blank">robert@raszuk.net</a>&gt; wrote:<br></div><blockquote class=3D=
"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(2=
04,204,204);padding-left:1ex"><div dir=3D"ltr">Hi Joel,<div><br></div><div>=
&gt; Robert, you seem to be asking that we pass full information about the<=
br>&gt; dynamic network state to all routers=C2=A0=C2=A0<br></div><div><br>=
</div><div>No not at all.=C2=A0</div><div><br></div><div>Only TE headends=
=C2=A0need this information.=C2=A0</div><div><br></div><div>To restate ... =
I am not asking to have a synchronized input to all routes in the domain su=
ch that their computation would be consistent.=C2=A0</div><div><br></div><d=
iv>I am only asking for TE headends=C2=A0to be able to select end to end pa=
ths based on the end to end inband telemetry data. I find this a useful req=
uirement missing from any of today&#39;s operational=C2=A0deployments.=C2=
=A0</div><div><br></div><div>Many thx,<br>R.=C2=A0</div><div><br></div><div=
><br></div><div><br></div><div><br></div><div><br></div></div><br><div clas=
s=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, Apr 3, 2020=
 at 12:59 AM Joel M. Halpern &lt;<a href=3D"mailto:jmh@joelhalpern.com" tar=
get=3D"_blank">jmh@joelhalpern.com</a>&gt; wrote:<br></div><blockquote clas=
s=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid r=
gb(204,204,204);padding-left:1ex">Robert, you seem to be asking that we pas=
s full information about the <br>
dynamic network state to all routers so that they can, if needed, serve <br=
>
as fully intelligent path computation engines.=C2=A0 If you want to do that=
, <br>
you will need more than just the telemetry.=C2=A0 You will need the demands=
 <br>
that are coming in to all of those routers, so that you can make global <br=
>
decisions sensibly.<br>
Which is why we use quasi-centralized path computation engines.<br>
<br>
Yours,<br>
Joel<br>
<br>
On 4/2/2020 6:16 PM, Robert Raszuk wrote:<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt; If you consider such constrains to provide re=
achability for<br>
&gt;=C2=A0 =C2=A0 =C2=A0applications you will likely see value that in-situ=
 telemetry is<br>
&gt;=C2=A0 =C2=A0 =C2=A0your friend here. Really best friend as without him=
 you can not do<br>
&gt;=C2=A0 =C2=A0 =C2=A0the proper end to end path exclusion for SPT comput=
ations..<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0[as wg member] Are you thinking that shifting traff=
ic to a router is<br>
&gt;=C2=A0 =C2=A0 =C2=A0not going to affect it&#39;s jitter/drop rate?<br>
&gt; <br>
&gt; <br>
&gt; Well this is actually the other way around.<br>
&gt; <br>
&gt; First you have your default topology. They you are asked to <br>
&gt; construct=C2=A0new one based on applied constrains.<br>
&gt; <br>
&gt; So you create complete TE coverage and start running end to end data <=
br>
&gt; plane probing over all TE paths=C2=A0(say SR-TE for specific=C2=A0exam=
ple). Once <br>
&gt; you start collecting the probe results you can start excluding=C2=A0pa=
ths <br>
&gt; which do not meet your applied constraints. And that process continues=
..<br>
&gt; <br>
&gt; To your specific question - It is not that unusual where routers degra=
de <br>
&gt; their performance=C2=A0with time and in many cases the traffic is not =
the <br>
&gt; cause for it but internal bugs and malfunctions.<br>
&gt; <br>
&gt; Best,<br>
&gt; R.<br>
&gt; <br>
&gt; _______________________________________________<br>
&gt; Lsr mailing list<br>
&gt; <a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferre=
r" target=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
&gt; <br>
</blockquote></div>
_______________________________________________<br>
Lsr mailing list<br>
<a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
</blockquote></div>
</blockquote></div>

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From: Robert Raszuk <robert@raszuk.net>
Date: Fri, 3 Apr 2020 01:16:47 +0200
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To: Greg Mirsky <gregimirsky@gmail.com>
Cc: "Joel M. Halpern" <jmh@joelhalpern.com>, "lsr@ietf.org" <lsr@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/miW2SJ1J8nq8nhS9jtPRCOdYvrE>
Subject: Re: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
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> collected only on active paths

Here we clearly diverge :)

The notion of default active paths in my view represents many more
alternative paths constructed based on the default topology while cspf or
flex algo products may consist only of subset of those per applied
constraints.

Thx,
Robert


On Fri, Apr 3, 2020 at 1:13 AM Greg Mirsky <gregimirsky@gmail.com> wrote:

> And another note regarding the use of on-path collected telemetry
> information. I'd point that that information is collected only on active
> paths. Thus it characterizes the conditions experienced by already existing
> flows. Hence it might not be related to a path that the system intends to
> instantiate. One needs active OAM to collect such information.
>
> Regards,
> Greg
>
> On Thu, Apr 2, 2020 at 4:08 PM Greg Mirsky <gregimirsky@gmail.com> wrote:
>
>> Hi Robert,
>> I think that there's no apparent requirement to collect performance
>> information form each node in the network in order to select a path with
>> bounded delay and packet loss. Would you agree?
>>
>> Regards,
>> Greg
>>
>> On Thu, Apr 2, 2020 at 4:03 PM Robert Raszuk <robert@raszuk.net> wrote:
>>
>>> Hi Joel,
>>>
>>> > Robert, you seem to be asking that we pass full information about the
>>> > dynamic network state to all routers
>>>
>>> No not at all.
>>>
>>> Only TE headends need this information.
>>>
>>> To restate ... I am not asking to have a synchronized input to all
>>> routes in the domain such that their computation would be consistent.
>>>
>>> I am only asking for TE headends to be able to select end to end paths
>>> based on the end to end inband telemetry data. I find this a useful
>>> requirement missing from any of today's operational deployments.
>>>
>>> Many thx,
>>> R.
>>>
>>>
>>>
>>>
>>>
>>>
>>> On Fri, Apr 3, 2020 at 12:59 AM Joel M. Halpern <jmh@joelhalpern.com>
>>> wrote:
>>>
>>>> Robert, you seem to be asking that we pass full information about the
>>>> dynamic network state to all routers so that they can, if needed, serve
>>>> as fully intelligent path computation engines.  If you want to do that,
>>>> you will need more than just the telemetry.  You will need the demands
>>>> that are coming in to all of those routers, so that you can make global
>>>> decisions sensibly.
>>>> Which is why we use quasi-centralized path computation engines.
>>>>
>>>> Yours,
>>>> Joel
>>>>
>>>> On 4/2/2020 6:16 PM, Robert Raszuk wrote:
>>>> >
>>>> >      > If you consider such constrains to provide reachability for
>>>> >     applications you will likely see value that in-situ telemetry is
>>>> >     your friend here. Really best friend as without him you can not do
>>>> >     the proper end to end path exclusion for SPT computations..
>>>> >
>>>> >     [as wg member] Are you thinking that shifting traffic to a router
>>>> is
>>>> >     not going to affect it's jitter/drop rate?
>>>> >
>>>> >
>>>> > Well this is actually the other way around.
>>>> >
>>>> > First you have your default topology. They you are asked to
>>>> > construct new one based on applied constrains.
>>>> >
>>>> > So you create complete TE coverage and start running end to end data
>>>> > plane probing over all TE paths (say SR-TE for specific example).
>>>> Once
>>>> > you start collecting the probe results you can start excluding paths
>>>> > which do not meet your applied constraints. And that process
>>>> continues..
>>>> >
>>>> > To your specific question - It is not that unusual where routers
>>>> degrade
>>>> > their performance with time and in many cases the traffic is not the
>>>> > cause for it but internal bugs and malfunctions.
>>>> >
>>>> > Best,
>>>> > R.
>>>> >
>>>> > _______________________________________________
>>>> > Lsr mailing list
>>>> > Lsr@ietf.org
>>>> > https://www.ietf.org/mailman/listinfo/lsr
>>>> >
>>>>
>>> _______________________________________________
>>> Lsr mailing list
>>> Lsr@ietf.org
>>> https://www.ietf.org/mailman/listinfo/lsr
>>>
>>

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<div dir=3D"ltr">&gt; collected only on active paths=C2=A0=C2=A0<br><div><b=
r></div><div>Here we clearly diverge :)=C2=A0</div><div><br></div><div>The =
notion of default active paths in my view represents many more alternative =
paths constructed=C2=A0based on the=C2=A0default topology=C2=A0while cspf o=
r flex algo products may consist only of subset of those per applied constr=
aints.=C2=A0</div><div><br></div><div>Thx,</div><div>Robert</div><div><br><=
/div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_a=
ttr">On Fri, Apr 3, 2020 at 1:13 AM Greg Mirsky &lt;<a href=3D"mailto:gregi=
mirsky@gmail.com">gregimirsky@gmail.com</a>&gt; wrote:<br></div><blockquote=
 class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px so=
lid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr">And another note re=
garding the use of on-path collected telemetry information. I&#39;d point t=
hat that information is collected only on active paths. Thus it characteriz=
es the conditions experienced by already existing flows. Hence it might not=
 be related to a path that the system intends to instantiate. One needs act=
ive OAM to collect such information.<div><br></div><div>Regards,</div><div>=
Greg</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gm=
ail_attr">On Thu, Apr 2, 2020 at 4:08 PM Greg Mirsky &lt;<a href=3D"mailto:=
gregimirsky@gmail.com" target=3D"_blank">gregimirsky@gmail.com</a>&gt; wrot=
e:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0=
.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"l=
tr">Hi Robert,<div>I think that there&#39;s no apparent requirement to coll=
ect performance information form each node in the network in order to selec=
t a path with bounded delay and packet loss. Would you agree?</div><div><br=
></div><div>Regards,</div><div>Greg</div></div><br><div class=3D"gmail_quot=
e"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, Apr 2, 2020 at 4:03 PM Rob=
ert Raszuk &lt;<a href=3D"mailto:robert@raszuk.net" target=3D"_blank">rober=
t@raszuk.net</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" styl=
e=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);paddin=
g-left:1ex"><div dir=3D"ltr">Hi Joel,<div><br></div><div>&gt; Robert, you s=
eem to be asking that we pass full information about the<br>&gt; dynamic ne=
twork state to all routers=C2=A0=C2=A0<br></div><div><br></div><div>No not =
at all.=C2=A0</div><div><br></div><div>Only TE headends=C2=A0need this info=
rmation.=C2=A0</div><div><br></div><div>To restate ... I am not asking to h=
ave a synchronized input to all routes in the domain such that their comput=
ation would be consistent.=C2=A0</div><div><br></div><div>I am only asking =
for TE headends=C2=A0to be able to select end to end paths based on the end=
 to end inband telemetry data. I find this a useful requirement missing fro=
m any of today&#39;s operational=C2=A0deployments.=C2=A0</div><div><br></di=
v><div>Many thx,<br>R.=C2=A0</div><div><br></div><div><br></div><div><br></=
div><div><br></div><div><br></div></div><br><div class=3D"gmail_quote"><div=
 dir=3D"ltr" class=3D"gmail_attr">On Fri, Apr 3, 2020 at 12:59 AM Joel M. H=
alpern &lt;<a href=3D"mailto:jmh@joelhalpern.com" target=3D"_blank">jmh@joe=
lhalpern.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" styl=
e=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);paddin=
g-left:1ex">Robert, you seem to be asking that we pass full information abo=
ut the <br>
dynamic network state to all routers so that they can, if needed, serve <br=
>
as fully intelligent path computation engines.=C2=A0 If you want to do that=
, <br>
you will need more than just the telemetry.=C2=A0 You will need the demands=
 <br>
that are coming in to all of those routers, so that you can make global <br=
>
decisions sensibly.<br>
Which is why we use quasi-centralized path computation engines.<br>
<br>
Yours,<br>
Joel<br>
<br>
On 4/2/2020 6:16 PM, Robert Raszuk wrote:<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt; If you consider such constrains to provide re=
achability for<br>
&gt;=C2=A0 =C2=A0 =C2=A0applications you will likely see value that in-situ=
 telemetry is<br>
&gt;=C2=A0 =C2=A0 =C2=A0your friend here. Really best friend as without him=
 you can not do<br>
&gt;=C2=A0 =C2=A0 =C2=A0the proper end to end path exclusion for SPT comput=
ations..<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0[as wg member] Are you thinking that shifting traff=
ic to a router is<br>
&gt;=C2=A0 =C2=A0 =C2=A0not going to affect it&#39;s jitter/drop rate?<br>
&gt; <br>
&gt; <br>
&gt; Well this is actually the other way around.<br>
&gt; <br>
&gt; First you have your default topology. They you are asked to <br>
&gt; construct=C2=A0new one based on applied constrains.<br>
&gt; <br>
&gt; So you create complete TE coverage and start running end to end data <=
br>
&gt; plane probing over all TE paths=C2=A0(say SR-TE for specific=C2=A0exam=
ple). Once <br>
&gt; you start collecting the probe results you can start excluding=C2=A0pa=
ths <br>
&gt; which do not meet your applied constraints. And that process continues=
..<br>
&gt; <br>
&gt; To your specific question - It is not that unusual where routers degra=
de <br>
&gt; their performance=C2=A0with time and in many cases the traffic is not =
the <br>
&gt; cause for it but internal bugs and malfunctions.<br>
&gt; <br>
&gt; Best,<br>
&gt; R.<br>
&gt; <br>
&gt; _______________________________________________<br>
&gt; Lsr mailing list<br>
&gt; <a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferre=
r" target=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
&gt; <br>
</blockquote></div>
_______________________________________________<br>
Lsr mailing list<br>
<a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
</blockquote></div>
</blockquote></div>
</blockquote></div>

--0000000000004652ef05a256ff22--


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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Thu, 2 Apr 2020 16:22:12 -0700
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To: Robert Raszuk <robert@raszuk.net>
Cc: "Joel M. Halpern" <jmh@joelhalpern.com>, "lsr@ietf.org" <lsr@ietf.org>
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Subject: Re: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
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Hi Robert,
"collected only on active paths" is not something I propose but is the
property of on-path telemetry collection method.

Regards,
Greg

On Thu, Apr 2, 2020 at 4:16 PM Robert Raszuk <robert@raszuk.net> wrote:

> > collected only on active paths
>
> Here we clearly diverge :)
>
> The notion of default active paths in my view represents many more
> alternative paths constructed based on the default topology while cspf or
> flex algo products may consist only of subset of those per applied
> constraints.
>
> Thx,
> Robert
>
>
> On Fri, Apr 3, 2020 at 1:13 AM Greg Mirsky <gregimirsky@gmail.com> wrote:
>
>> And another note regarding the use of on-path collected telemetry
>> information. I'd point that that information is collected only on active
>> paths. Thus it characterizes the conditions experienced by already existing
>> flows. Hence it might not be related to a path that the system intends to
>> instantiate. One needs active OAM to collect such information.
>>
>> Regards,
>> Greg
>>
>> On Thu, Apr 2, 2020 at 4:08 PM Greg Mirsky <gregimirsky@gmail.com> wrote:
>>
>>> Hi Robert,
>>> I think that there's no apparent requirement to collect performance
>>> information form each node in the network in order to select a path with
>>> bounded delay and packet loss. Would you agree?
>>>
>>> Regards,
>>> Greg
>>>
>>> On Thu, Apr 2, 2020 at 4:03 PM Robert Raszuk <robert@raszuk.net> wrote:
>>>
>>>> Hi Joel,
>>>>
>>>> > Robert, you seem to be asking that we pass full information about the
>>>> > dynamic network state to all routers
>>>>
>>>> No not at all.
>>>>
>>>> Only TE headends need this information.
>>>>
>>>> To restate ... I am not asking to have a synchronized input to all
>>>> routes in the domain such that their computation would be consistent.
>>>>
>>>> I am only asking for TE headends to be able to select end to end paths
>>>> based on the end to end inband telemetry data. I find this a useful
>>>> requirement missing from any of today's operational deployments.
>>>>
>>>> Many thx,
>>>> R.
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>> On Fri, Apr 3, 2020 at 12:59 AM Joel M. Halpern <jmh@joelhalpern.com>
>>>> wrote:
>>>>
>>>>> Robert, you seem to be asking that we pass full information about the
>>>>> dynamic network state to all routers so that they can, if needed,
>>>>> serve
>>>>> as fully intelligent path computation engines.  If you want to do
>>>>> that,
>>>>> you will need more than just the telemetry.  You will need the demands
>>>>> that are coming in to all of those routers, so that you can make
>>>>> global
>>>>> decisions sensibly.
>>>>> Which is why we use quasi-centralized path computation engines.
>>>>>
>>>>> Yours,
>>>>> Joel
>>>>>
>>>>> On 4/2/2020 6:16 PM, Robert Raszuk wrote:
>>>>> >
>>>>> >      > If you consider such constrains to provide reachability for
>>>>> >     applications you will likely see value that in-situ telemetry is
>>>>> >     your friend here. Really best friend as without him you can not
>>>>> do
>>>>> >     the proper end to end path exclusion for SPT computations..
>>>>> >
>>>>> >     [as wg member] Are you thinking that shifting traffic to a
>>>>> router is
>>>>> >     not going to affect it's jitter/drop rate?
>>>>> >
>>>>> >
>>>>> > Well this is actually the other way around.
>>>>> >
>>>>> > First you have your default topology. They you are asked to
>>>>> > construct new one based on applied constrains.
>>>>> >
>>>>> > So you create complete TE coverage and start running end to end data
>>>>> > plane probing over all TE paths (say SR-TE for specific example).
>>>>> Once
>>>>> > you start collecting the probe results you can start excluding paths
>>>>> > which do not meet your applied constraints. And that process
>>>>> continues..
>>>>> >
>>>>> > To your specific question - It is not that unusual where routers
>>>>> degrade
>>>>> > their performance with time and in many cases the traffic is not the
>>>>> > cause for it but internal bugs and malfunctions.
>>>>> >
>>>>> > Best,
>>>>> > R.
>>>>> >
>>>>> > _______________________________________________
>>>>> > Lsr mailing list
>>>>> > Lsr@ietf.org
>>>>> > https://www.ietf.org/mailman/listinfo/lsr
>>>>> >
>>>>>
>>>> _______________________________________________
>>>> Lsr mailing list
>>>> Lsr@ietf.org
>>>> https://www.ietf.org/mailman/listinfo/lsr
>>>>
>>>

--000000000000b356c205a2571295
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Robert,<div>&quot;collected only on active paths&quot; =
is not something I propose but is the property of on-path telemetry collect=
ion method. </div><div><br></div><div>Regards,</div><div>Greg</div></div><b=
r><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, =
Apr 2, 2020 at 4:16 PM Robert Raszuk &lt;<a href=3D"mailto:robert@raszuk.ne=
t">robert@raszuk.net</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quo=
te" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204=
);padding-left:1ex"><div dir=3D"ltr">&gt; collected only on active paths=C2=
=A0=C2=A0<br><div><br></div><div>Here we clearly diverge :)=C2=A0</div><div=
><br></div><div>The notion of default active paths in my view represents ma=
ny more alternative paths constructed=C2=A0based on the=C2=A0default topolo=
gy=C2=A0while cspf or flex algo products may consist only of subset of thos=
e per applied constraints.=C2=A0</div><div><br></div><div>Thx,</div><div>Ro=
bert</div><div><br></div></div><br><div class=3D"gmail_quote"><div dir=3D"l=
tr" class=3D"gmail_attr">On Fri, Apr 3, 2020 at 1:13 AM Greg Mirsky &lt;<a =
href=3D"mailto:gregimirsky@gmail.com" target=3D"_blank">gregimirsky@gmail.c=
om</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margi=
n:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex=
"><div dir=3D"ltr">And another note regarding the use of on-path collected =
telemetry information. I&#39;d point that that information is collected onl=
y on active paths. Thus it characterizes the conditions experienced by alre=
ady existing flows. Hence it might not be related to a path that the system=
 intends to instantiate. One needs active OAM to collect such information.<=
div><br></div><div>Regards,</div><div>Greg</div></div><br><div class=3D"gma=
il_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, Apr 2, 2020 at 4:08=
 PM Greg Mirsky &lt;<a href=3D"mailto:gregimirsky@gmail.com" target=3D"_bla=
nk">gregimirsky@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmai=
l_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,20=
4,204);padding-left:1ex"><div dir=3D"ltr">Hi Robert,<div>I think that there=
&#39;s no apparent requirement to collect performance information form each=
 node in the network in order to select a path with bounded delay and packe=
t loss. Would you agree?</div><div><br></div><div>Regards,</div><div>Greg</=
div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_at=
tr">On Thu, Apr 2, 2020 at 4:03 PM Robert Raszuk &lt;<a href=3D"mailto:robe=
rt@raszuk.net" target=3D"_blank">robert@raszuk.net</a>&gt; wrote:<br></div>=
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr">Hi Joel,=
<div><br></div><div>&gt; Robert, you seem to be asking that we pass full in=
formation about the<br>&gt; dynamic network state to all routers=C2=A0=C2=
=A0<br></div><div><br></div><div>No not at all.=C2=A0</div><div><br></div><=
div>Only TE headends=C2=A0need this information.=C2=A0</div><div><br></div>=
<div>To restate ... I am not asking to have a synchronized input to all rou=
tes in the domain such that their computation would be consistent.=C2=A0</d=
iv><div><br></div><div>I am only asking for TE headends=C2=A0to be able to =
select end to end paths based on the end to end inband telemetry data. I fi=
nd this a useful requirement missing from any of today&#39;s operational=C2=
=A0deployments.=C2=A0</div><div><br></div><div>Many thx,<br>R.=C2=A0</div><=
div><br></div><div><br></div><div><br></div><div><br></div><div><br></div><=
/div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">O=
n Fri, Apr 3, 2020 at 12:59 AM Joel M. Halpern &lt;<a href=3D"mailto:jmh@jo=
elhalpern.com" target=3D"_blank">jmh@joelhalpern.com</a>&gt; wrote:<br></di=
v><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;borde=
r-left:1px solid rgb(204,204,204);padding-left:1ex">Robert, you seem to be =
asking that we pass full information about the <br>
dynamic network state to all routers so that they can, if needed, serve <br=
>
as fully intelligent path computation engines.=C2=A0 If you want to do that=
, <br>
you will need more than just the telemetry.=C2=A0 You will need the demands=
 <br>
that are coming in to all of those routers, so that you can make global <br=
>
decisions sensibly.<br>
Which is why we use quasi-centralized path computation engines.<br>
<br>
Yours,<br>
Joel<br>
<br>
On 4/2/2020 6:16 PM, Robert Raszuk wrote:<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt; If you consider such constrains to provide re=
achability for<br>
&gt;=C2=A0 =C2=A0 =C2=A0applications you will likely see value that in-situ=
 telemetry is<br>
&gt;=C2=A0 =C2=A0 =C2=A0your friend here. Really best friend as without him=
 you can not do<br>
&gt;=C2=A0 =C2=A0 =C2=A0the proper end to end path exclusion for SPT comput=
ations..<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0[as wg member] Are you thinking that shifting traff=
ic to a router is<br>
&gt;=C2=A0 =C2=A0 =C2=A0not going to affect it&#39;s jitter/drop rate?<br>
&gt; <br>
&gt; <br>
&gt; Well this is actually the other way around.<br>
&gt; <br>
&gt; First you have your default topology. They you are asked to <br>
&gt; construct=C2=A0new one based on applied constrains.<br>
&gt; <br>
&gt; So you create complete TE coverage and start running end to end data <=
br>
&gt; plane probing over all TE paths=C2=A0(say SR-TE for specific=C2=A0exam=
ple). Once <br>
&gt; you start collecting the probe results you can start excluding=C2=A0pa=
ths <br>
&gt; which do not meet your applied constraints. And that process continues=
..<br>
&gt; <br>
&gt; To your specific question - It is not that unusual where routers degra=
de <br>
&gt; their performance=C2=A0with time and in many cases the traffic is not =
the <br>
&gt; cause for it but internal bugs and malfunctions.<br>
&gt; <br>
&gt; Best,<br>
&gt; R.<br>
&gt; <br>
&gt; _______________________________________________<br>
&gt; Lsr mailing list<br>
&gt; <a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferre=
r" target=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
&gt; <br>
</blockquote></div>
_______________________________________________<br>
Lsr mailing list<br>
<a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
</blockquote></div>
</blockquote></div>
</blockquote></div>
</blockquote></div>

--000000000000b356c205a2571295--


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> "collected only on active paths" is not something I propose but is the
property of on-path
> telemetry collection method.

That is all fine. The point is that the notion of active paths in the
network may represent those in default topology over any path. That can be
computed by PCE.

So default topology may have N active paths while
application specific topologies M where M is a subset of N meeting required
end to end constraints.

Sure it is possible to discover if my tailends are capable of handling in
band telemetry by off line means. But what I am struggling to see why we
allowed so much TE stuff into IGPs and we do not want to make it easier for
headends to operate without PCE at all for the purpose of delivering
such type of services.

Kind regards,
R.

On Fri, Apr 3, 2020 at 1:22 AM Greg Mirsky <gregimirsky@gmail.com> wrote:

> Hi Robert,
> "collected only on active paths" is not something I propose but is the
> property of on-path telemetry collection method.
>
> Regards,
> Greg
>
> On Thu, Apr 2, 2020 at 4:16 PM Robert Raszuk <robert@raszuk.net> wrote:
>
>> > collected only on active paths
>>
>> Here we clearly diverge :)
>>
>> The notion of default active paths in my view represents many more
>> alternative paths constructed based on the default topology while cspf or
>> flex algo products may consist only of subset of those per applied
>> constraints.
>>
>> Thx,
>> Robert
>>
>>
>> On Fri, Apr 3, 2020 at 1:13 AM Greg Mirsky <gregimirsky@gmail.com> wrote:
>>
>>> And another note regarding the use of on-path collected telemetry
>>> information. I'd point that that information is collected only on active
>>> paths. Thus it characterizes the conditions experienced by already existing
>>> flows. Hence it might not be related to a path that the system intends to
>>> instantiate. One needs active OAM to collect such information.
>>>
>>> Regards,
>>> Greg
>>>
>>> On Thu, Apr 2, 2020 at 4:08 PM Greg Mirsky <gregimirsky@gmail.com>
>>> wrote:
>>>
>>>> Hi Robert,
>>>> I think that there's no apparent requirement to collect performance
>>>> information form each node in the network in order to select a path with
>>>> bounded delay and packet loss. Would you agree?
>>>>
>>>> Regards,
>>>> Greg
>>>>
>>>> On Thu, Apr 2, 2020 at 4:03 PM Robert Raszuk <robert@raszuk.net> wrote:
>>>>
>>>>> Hi Joel,
>>>>>
>>>>> > Robert, you seem to be asking that we pass full information about the
>>>>> > dynamic network state to all routers
>>>>>
>>>>> No not at all.
>>>>>
>>>>> Only TE headends need this information.
>>>>>
>>>>> To restate ... I am not asking to have a synchronized input to all
>>>>> routes in the domain such that their computation would be consistent.
>>>>>
>>>>> I am only asking for TE headends to be able to select end to end paths
>>>>> based on the end to end inband telemetry data. I find this a useful
>>>>> requirement missing from any of today's operational deployments.
>>>>>
>>>>> Many thx,
>>>>> R.
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On Fri, Apr 3, 2020 at 12:59 AM Joel M. Halpern <jmh@joelhalpern.com>
>>>>> wrote:
>>>>>
>>>>>> Robert, you seem to be asking that we pass full information about the
>>>>>> dynamic network state to all routers so that they can, if needed,
>>>>>> serve
>>>>>> as fully intelligent path computation engines.  If you want to do
>>>>>> that,
>>>>>> you will need more than just the telemetry.  You will need the
>>>>>> demands
>>>>>> that are coming in to all of those routers, so that you can make
>>>>>> global
>>>>>> decisions sensibly.
>>>>>> Which is why we use quasi-centralized path computation engines.
>>>>>>
>>>>>> Yours,
>>>>>> Joel
>>>>>>
>>>>>> On 4/2/2020 6:16 PM, Robert Raszuk wrote:
>>>>>> >
>>>>>> >      > If you consider such constrains to provide reachability for
>>>>>> >     applications you will likely see value that in-situ telemetry is
>>>>>> >     your friend here. Really best friend as without him you can not
>>>>>> do
>>>>>> >     the proper end to end path exclusion for SPT computations..
>>>>>> >
>>>>>> >     [as wg member] Are you thinking that shifting traffic to a
>>>>>> router is
>>>>>> >     not going to affect it's jitter/drop rate?
>>>>>> >
>>>>>> >
>>>>>> > Well this is actually the other way around.
>>>>>> >
>>>>>> > First you have your default topology. They you are asked to
>>>>>> > construct new one based on applied constrains.
>>>>>> >
>>>>>> > So you create complete TE coverage and start running end to end
>>>>>> data
>>>>>> > plane probing over all TE paths (say SR-TE for specific example).
>>>>>> Once
>>>>>> > you start collecting the probe results you can start
>>>>>> excluding paths
>>>>>> > which do not meet your applied constraints. And that process
>>>>>> continues..
>>>>>> >
>>>>>> > To your specific question - It is not that unusual where routers
>>>>>> degrade
>>>>>> > their performance with time and in many cases the traffic is not
>>>>>> the
>>>>>> > cause for it but internal bugs and malfunctions.
>>>>>> >
>>>>>> > Best,
>>>>>> > R.
>>>>>> >
>>>>>> > _______________________________________________
>>>>>> > Lsr mailing list
>>>>>> > Lsr@ietf.org
>>>>>> > https://www.ietf.org/mailman/listinfo/lsr
>>>>>> >
>>>>>>
>>>>> _______________________________________________
>>>>> Lsr mailing list
>>>>> Lsr@ietf.org
>>>>> https://www.ietf.org/mailman/listinfo/lsr
>>>>>
>>>>

--00000000000086f55705a25737c1
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr"><div><div>&gt; &quot;collected only on ac=
tive paths&quot; is not something I propose but is the property of on-path=
=C2=A0</div><div>&gt; telemetry collection method. </div><div></div></div><=
div><br></div>That is all fine. The point is that the notion of active path=
s in the network may represent those in default=C2=A0topology over any path=
. That can be computed by PCE.=C2=A0<div><br></div><div>So default topology=
 may have N active paths while application=C2=A0specific=C2=A0topologies M =
where M is a subset of N meeting required end to end constraints.=C2=A0<br>=
</div><div><br></div><div>Sure it is possible to discover if my tailends ar=
e capable of handling in band telemetry by off line means. But what I am st=
ruggling to see why we allowed so much TE stuff into IGPs and we do not wan=
t to make it easier for headends to operate without PCE at all for the purp=
ose of delivering such=C2=A0type of services.=C2=A0</div><div><br></div></d=
iv><div>Kind regards,<br>R.</div><br><div class=3D"gmail_quote"><div dir=3D=
"ltr" class=3D"gmail_attr">On Fri, Apr 3, 2020 at 1:22 AM Greg Mirsky &lt;<=
a href=3D"mailto:gregimirsky@gmail.com">gregimirsky@gmail.com</a>&gt; wrote=
:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.=
8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"lt=
r">Hi Robert,<div>&quot;collected only on active paths&quot; is not somethi=
ng I propose but is the property of on-path telemetry collection method. </=
div><div><br></div><div>Regards,</div><div>Greg</div></div><br><div class=
=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, Apr 2, 2020 =
at 4:16 PM Robert Raszuk &lt;<a href=3D"mailto:robert@raszuk.net" target=3D=
"_blank">robert@raszuk.net</a>&gt; wrote:<br></div><blockquote class=3D"gma=
il_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,2=
04,204);padding-left:1ex"><div dir=3D"ltr">&gt; collected only on active pa=
ths=C2=A0=C2=A0<br><div><br></div><div>Here we clearly diverge :)=C2=A0</di=
v><div><br></div><div>The notion of default active paths in my view represe=
nts many more alternative paths constructed=C2=A0based on the=C2=A0default =
topology=C2=A0while cspf or flex algo products may consist only of subset o=
f those per applied constraints.=C2=A0</div><div><br></div><div>Thx,</div><=
div>Robert</div><div><br></div></div><br><div class=3D"gmail_quote"><div di=
r=3D"ltr" class=3D"gmail_attr">On Fri, Apr 3, 2020 at 1:13 AM Greg Mirsky &=
lt;<a href=3D"mailto:gregimirsky@gmail.com" target=3D"_blank">gregimirsky@g=
mail.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D=
"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-le=
ft:1ex"><div dir=3D"ltr">And another note regarding the use of on-path coll=
ected telemetry information. I&#39;d point that that information is collect=
ed only on active paths. Thus it characterizes the conditions experienced b=
y already existing flows. Hence it might not be related to a path that the =
system intends to instantiate. One needs active OAM to collect such informa=
tion.<div><br></div><div>Regards,</div><div>Greg</div></div><br><div class=
=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, Apr 2, 2020 =
at 4:08 PM Greg Mirsky &lt;<a href=3D"mailto:gregimirsky@gmail.com" target=
=3D"_blank">gregimirsky@gmail.com</a>&gt; wrote:<br></div><blockquote class=
=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rg=
b(204,204,204);padding-left:1ex"><div dir=3D"ltr">Hi Robert,<div>I think th=
at there&#39;s no apparent requirement to collect performance information f=
orm each node in the network in order to select a path with bounded delay a=
nd packet loss. Would you agree?</div><div><br></div><div>Regards,</div><di=
v>Greg</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"=
gmail_attr">On Thu, Apr 2, 2020 at 4:03 PM Robert Raszuk &lt;<a href=3D"mai=
lto:robert@raszuk.net" target=3D"_blank">robert@raszuk.net</a>&gt; wrote:<b=
r></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex=
;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr">=
Hi Joel,<div><br></div><div>&gt; Robert, you seem to be asking that we pass=
 full information about the<br>&gt; dynamic network state to all routers=C2=
=A0=C2=A0<br></div><div><br></div><div>No not at all.=C2=A0</div><div><br><=
/div><div>Only TE headends=C2=A0need this information.=C2=A0</div><div><br>=
</div><div>To restate ... I am not asking to have a synchronized input to a=
ll routes in the domain such that their computation would be consistent.=C2=
=A0</div><div><br></div><div>I am only asking for TE headends=C2=A0to be ab=
le to select end to end paths based on the end to end inband telemetry data=
. I find this a useful requirement missing from any of today&#39;s operatio=
nal=C2=A0deployments.=C2=A0</div><div><br></div><div>Many thx,<br>R.=C2=A0<=
/div><div><br></div><div><br></div><div><br></div><div><br></div><div><br><=
/div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_a=
ttr">On Fri, Apr 3, 2020 at 12:59 AM Joel M. Halpern &lt;<a href=3D"mailto:=
jmh@joelhalpern.com" target=3D"_blank">jmh@joelhalpern.com</a>&gt; wrote:<b=
r></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex=
;border-left:1px solid rgb(204,204,204);padding-left:1ex">Robert, you seem =
to be asking that we pass full information about the <br>
dynamic network state to all routers so that they can, if needed, serve <br=
>
as fully intelligent path computation engines.=C2=A0 If you want to do that=
, <br>
you will need more than just the telemetry.=C2=A0 You will need the demands=
 <br>
that are coming in to all of those routers, so that you can make global <br=
>
decisions sensibly.<br>
Which is why we use quasi-centralized path computation engines.<br>
<br>
Yours,<br>
Joel<br>
<br>
On 4/2/2020 6:16 PM, Robert Raszuk wrote:<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt; If you consider such constrains to provide re=
achability for<br>
&gt;=C2=A0 =C2=A0 =C2=A0applications you will likely see value that in-situ=
 telemetry is<br>
&gt;=C2=A0 =C2=A0 =C2=A0your friend here. Really best friend as without him=
 you can not do<br>
&gt;=C2=A0 =C2=A0 =C2=A0the proper end to end path exclusion for SPT comput=
ations..<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0[as wg member] Are you thinking that shifting traff=
ic to a router is<br>
&gt;=C2=A0 =C2=A0 =C2=A0not going to affect it&#39;s jitter/drop rate?<br>
&gt; <br>
&gt; <br>
&gt; Well this is actually the other way around.<br>
&gt; <br>
&gt; First you have your default topology. They you are asked to <br>
&gt; construct=C2=A0new one based on applied constrains.<br>
&gt; <br>
&gt; So you create complete TE coverage and start running end to end data <=
br>
&gt; plane probing over all TE paths=C2=A0(say SR-TE for specific=C2=A0exam=
ple). Once <br>
&gt; you start collecting the probe results you can start excluding=C2=A0pa=
ths <br>
&gt; which do not meet your applied constraints. And that process continues=
..<br>
&gt; <br>
&gt; To your specific question - It is not that unusual where routers degra=
de <br>
&gt; their performance=C2=A0with time and in many cases the traffic is not =
the <br>
&gt; cause for it but internal bugs and malfunctions.<br>
&gt; <br>
&gt; Best,<br>
&gt; R.<br>
&gt; <br>
&gt; _______________________________________________<br>
&gt; Lsr mailing list<br>
&gt; <a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferre=
r" target=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
&gt; <br>
</blockquote></div>
_______________________________________________<br>
Lsr mailing list<br>
<a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
</blockquote></div>
</blockquote></div>
</blockquote></div>
</blockquote></div>
</blockquote></div></div>

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References: <1520992FC97B944A9979C2FC1D7DB0F404DB1AD4@dggeml524-mbx.china.huawei.com> <MW3PR11MB4619925BEF83B0C4512DD284C1C90@MW3PR11MB4619.namprd11.prod.outlook.com> <06e8443210924ac788c40fa15972cbdd@huawei.com> <C987B657-64D1-4C70-B471-ED9F1266B990@cisco.com> <3948044C-0CC9-4AE8-8541-4D23A5DF396E@cisco.com> <1520992FC97B944A9979C2FC1D7DB0F404DF089E@dggeml524-mbx.china.huawei.com> <MW3PR11MB46197F8C43B3200B07641838C1C60@MW3PR11MB4619.namprd11.prod.outlook.com> <CAOj+MMGsVkws0sTw4RRdb_SdWvsuh+2Dxc-upXqT2_pmpO_+Lg@mail.gmail.com> <6930807B-2FF0-4A5C-AD39-D05345C37A5E@chopps.org> <MW3PR11MB461955420610E933ACC44BC4C1C60@MW3PR11MB4619.namprd11.prod.outlook.com> <CAOj+MMHoTbDzZrA1ttPsdD5Tk7TADaR=ex5WGF=6+X3X1utoHg@mail.gmail.com> <bd193457-956c-47b0-a50b-8d1778e8349a@Spark> <CAOj+MMGuRHVoJ3ez4nQ3O87J4U+-+yabYWeA1AEfj1UGAbPp7w@mail.gmail.com> <DD4DAC78-3A51-4E8D-802B-9FB515F86AF1@chopps.org> <CAOj+MMHa4J-619P6TWjSohB4yP3O5VPaq42VuAzNUmzbXsFcfA@mail.gmail.com> <4dcafca3-9211-e185-cd69-609cc6cb606f@joelhalpern.com> <CAOj+MMGSjb2Medd_wkV314pYrm_96GD5urxw5Qs34hMZt5BXMw@mail.gmail.com> <CA+RyBmUOgz9kGEBxZYrd7_ADeFPRiwODxqx3FcjpYYAE6tRwGQ@mail.gmail.com> <CA+RyBmXXpiSZj-0=RC=MqTNZYkPFnWZ6+O0ND7Jj1F7Fyh8Tjw@mail.gmail.com> <CAOj+MMGf9a6c9pNLYc+N14O-p86tty6tCaYcZ8gLEQNY6wv1Xw@mail.gmail.com> <CA+RyBmU-+Yh4nJWRUW5odExZcjthGKiaqO-sREHTxiMMwrRbvA@mail.gmail.com> <CAOj+MMEacTvZ=-6rhFY3yrD=UCYU=vY1Bt2asD=KrvR-et-eQg@mail.gmail.com>
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> Sure it is possible to discover if my tailends are capable of handling =
in band telemetry by off line means. But what I am struggling to see why =
we allowed so much TE stuff into IGPs and we do not want to make it =
easier for headends to operate without PCE at all for the purpose of =
delivering such type of services.=20


AFAICT, we put a lot of effort into making headend path computation =
useful and, for the most part, it was and is not necessary.

Even with legacy mechanisms, people decided that they need global =
optimization and that head-end path computation was Not That =
Interesting.

It=E2=80=99s now 20 years later, the network is even more dynamic, the =
expectations about response time are that much higher, and concerns =
about link state database stability and scalability have increased.  =
Modern telemetry is definitely not suitable to be passed in the IGP =
anymore. =20

Thus, it seems like the IGP can provide base topology information and =
traffic engineering constructs should leverage that and provide an =
independent telemetry collection plane. Within that plane, telemetry =
capabilities can and should be confined to the telemetry plane.

As we=E2=80=99ve said many times before: BGP is not a dump truck. =
Analogously, the IGP isn=E2=80=99t even an SUV.

;-)

Regards,
Tony


--Apple-Mail=_FABF0863-5765-4851-A614-912A4C484B7B
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" =
class=3D""><div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D""><span style=3D"caret-color: rgb(0, 0, 0); font-family: =
Helvetica; font-size: 14px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none; float: none; display: inline !important;" class=3D"">Sure it is =
possible to discover if my tailends are capable of handling in band =
telemetry by off line means. But what I am struggling to see why we =
allowed so much TE stuff into IGPs and we do not want to make it easier =
for headends to operate without PCE at all for the purpose of delivering =
such&nbsp;type of services.&nbsp;</span></div></blockquote></div><br =
class=3D""><div class=3D""><br class=3D""></div><div class=3D"">AFAICT, =
we put a lot of effort into making headend path computation useful and, =
for the most part, it was and is not necessary.</div><div class=3D""><br =
class=3D""></div><div class=3D"">Even with legacy mechanisms, people =
decided that they need global optimization and that head-end path =
computation was Not That Interesting.</div><div class=3D""><br =
class=3D""></div><div class=3D"">It=E2=80=99s now 20 years later, the =
network is even more dynamic, the expectations about response time are =
that much higher, and concerns about link state database stability and =
scalability have increased. &nbsp;Modern telemetry is definitely not =
suitable to be passed in the IGP anymore. &nbsp;</div><div class=3D""><br =
class=3D""></div><div class=3D"">Thus, it seems like the IGP can provide =
base topology information and traffic engineering constructs should =
leverage that and provide an independent telemetry collection plane. =
Within that plane, telemetry capabilities can and should be confined to =
the telemetry plane.</div><div class=3D""><br class=3D""></div><div =
class=3D"">As we=E2=80=99ve said many times before: BGP is not a dump =
truck. Analogously, the IGP isn=E2=80=99t even an SUV.</div><div =
class=3D""><br class=3D""></div><div class=3D"">;-)</div><div =
class=3D""><br class=3D""></div><div class=3D"">Regards,</div><div =
class=3D"">Tony</div><div class=3D""><br class=3D""></div></body></html>=

--Apple-Mail=_FABF0863-5765-4851-A614-912A4C484B7B--


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Sender: Tony Li <tony1athome@gmail.com>
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Subject: [Lsr] Dynamic flooding path computation
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Hi,

In this morning=E2=80=99s session, Acee asked a question about node =
selection as part of path computation.  I would like to expound a bit in =
the spirit of full transparency.

First off, the selection of nodes is NOT vital to the algorithm.  That =
said, we found that applying some heuristics helped make the algorithm =
slightly more efficient in some cases.

We select the starting node for the first cycle (n0 in the slides) by =
picking a node with the highest possible degree in the base topology.  =
Ideally, we=E2=80=99d really like to pick the node that=E2=80=99s at the =
center of the graph (and to be very precise, a node in the centroid or =
Jordan center), but the computation of this is somewhat expensive and =
doesn=E2=80=99t seem worthwhile. =20

At the end of the first cycle, we now have a set of bi-connected nodes =
that each have a degree of 2 in the flooding topology.  We could start =
the next iteration with any of these nodes, but we already know that n0 =
has the highest degree of anything in the topology, so we can always =
start the next iteration based off of n0.  Note that we do NOT want to =
continue doing this for subsequent iterations because the degree of n0 =
would quickly spiral out of control.  Instead, we want to continue to =
bound the degree of the nodes in the flooding topology, so we want to =
select a node that is on the flooding topology, but minimizes both =
degree and diameter.  Again, we are not trying for optimality, so we =
apply a simple weighting function to aid in this selection.

I hope this makes our approach very clear.

Regards,
Tony


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Subject: Re: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
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Robert,=20

We are deviating ;-)

There=E2=80=99s no feedback loop from telemetry producers back to the TE hea=
dend.
The telemetry, either end2end or postcards is sent to a  collector that has t=
he context of the data and normalizes it so it can be consumed by an externa=
l system, being centralized or distributed PCE or anything else that could m=
ake use of it. Do you see IGP anywhere in between?


Regards,
Jeff

> On Apr 2, 2020, at 16:03, Robert Raszuk <robert@raszuk.net> wrote:
>=20
> =EF=BB=BF
> Hi Joel,
>=20
> > Robert, you seem to be asking that we pass full information about the
> > dynamic network state to all routers =20
>=20
> No not at all.=20
>=20
> Only TE headends need this information.=20
>=20
> To restate ... I am not asking to have a synchronized input to all routes i=
n the domain such that their computation would be consistent.=20
>=20
> I am only asking for TE headends to be able to select end to end paths bas=
ed on the end to end inband telemetry data. I find this a useful requirement=
 missing from any of today's operational deployments.=20
>=20
> Many thx,
> R.=20
>=20
>=20
>=20
>=20
>=20
>=20
>> On Fri, Apr 3, 2020 at 12:59 AM Joel M. Halpern <jmh@joelhalpern.com> wro=
te:
>> Robert, you seem to be asking that we pass full information about the=20
>> dynamic network state to all routers so that they can, if needed, serve=20=

>> as fully intelligent path computation engines.  If you want to do that,=20=

>> you will need more than just the telemetry.  You will need the demands=20=

>> that are coming in to all of those routers, so that you can make global=20=

>> decisions sensibly.
>> Which is why we use quasi-centralized path computation engines.
>>=20
>> Yours,
>> Joel
>>=20
>> On 4/2/2020 6:16 PM, Robert Raszuk wrote:
>> >=20
>> >      > If you consider such constrains to provide reachability for
>> >     applications you will likely see value that in-situ telemetry is
>> >     your friend here. Really best friend as without him you can not do
>> >     the proper end to end path exclusion for SPT computations..
>> >=20
>> >     [as wg member] Are you thinking that shifting traffic to a router i=
s
>> >     not going to affect it's jitter/drop rate?
>> >=20
>> >=20
>> > Well this is actually the other way around.
>> >=20
>> > First you have your default topology. They you are asked to=20
>> > construct new one based on applied constrains.
>> >=20
>> > So you create complete TE coverage and start running end to end data=20=

>> > plane probing over all TE paths (say SR-TE for specific example). Once=20=

>> > you start collecting the probe results you can start excluding paths
>> > which do not meet your applied constraints. And that process continues.=
.
>> >=20
>> > To your specific question - It is not that unusual where routers degrad=
e=20
>> > their performance with time and in many cases the traffic is not the=20=

>> > cause for it but internal bugs and malfunctions.
>> >=20
>> > Best,
>> > R.
>> >=20
>> > _______________________________________________
>> > Lsr mailing list
>> > Lsr@ietf.org
>> > https://www.ietf.org/mailman/listinfo/lsr
>> >=20
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Robert,&nbsp;<div><br></div><div>We are dev=
iating ;-)<br><div><br></div><div>There=E2=80=99s no feedback loop from tele=
metry producers back to the TE headend.</div><div>The telemetry, either end2=
end or postcards is sent to a &nbsp;collector that has the context of the da=
ta and normalizes it so it can be consumed by an external system, being cent=
ralized or distributed PCE or anything else that could make use of it. Do yo=
u see IGP anywhere in between?</div><div><br></div><div><br><div dir=3D"ltr"=
>Regards,<div>Jeff</div></div><div dir=3D"ltr"><br><blockquote type=3D"cite"=
>On Apr 2, 2020, at 16:03, Robert Raszuk &lt;robert@raszuk.net&gt; wrote:<br=
><br></blockquote></div><blockquote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF=
<div dir=3D"ltr">Hi Joel,<div><br></div><div>&gt; Robert, you seem to be ask=
ing that we pass full information about the<br>&gt; dynamic network state to=
 all routers&nbsp;&nbsp;<br></div><div><br></div><div>No not at all.&nbsp;</=
div><div><br></div><div>Only TE headends&nbsp;need this information.&nbsp;</=
div><div><br></div><div>To restate ... I am not asking to have a synchronize=
d input to all routes in the domain such that their computation would be con=
sistent.&nbsp;</div><div><br></div><div>I am only asking for TE headends&nbs=
p;to be able to select end to end paths based on the end to end inband telem=
etry data. I find this a useful requirement missing from any of today's oper=
ational&nbsp;deployments.&nbsp;</div><div><br></div><div>Many thx,<br>R.&nbs=
p;</div><div><br></div><div><br></div><div><br></div><div><br></div><div><br=
></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_=
attr">On Fri, Apr 3, 2020 at 12:59 AM Joel M. Halpern &lt;<a href=3D"mailto:=
jmh@joelhalpern.com">jmh@joelhalpern.com</a>&gt; wrote:<br></div><blockquote=
 class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px sol=
id rgb(204,204,204);padding-left:1ex">Robert, you seem to be asking that we p=
ass full information about the <br>
dynamic network state to all routers so that they can, if needed, serve <br>=

as fully intelligent path computation engines.&nbsp; If you want to do that,=
 <br>
you will need more than just the telemetry.&nbsp; You will need the demands <=
br>
that are coming in to all of those routers, so that you can make global <br>=

decisions sensibly.<br>
Which is why we use quasi-centralized path computation engines.<br>
<br>
Yours,<br>
Joel<br>
<br>
On 4/2/2020 6:16 PM, Robert Raszuk wrote:<br>
&gt; <br>
&gt;&nbsp; &nbsp; &nbsp; &gt; If you consider such constrains to provide rea=
chability for<br>
&gt;&nbsp; &nbsp; &nbsp;applications you will likely see value that in-situ t=
elemetry is<br>
&gt;&nbsp; &nbsp; &nbsp;your friend here. Really best friend as without him y=
ou can not do<br>
&gt;&nbsp; &nbsp; &nbsp;the proper end to end path exclusion for SPT computa=
tions..<br>
&gt; <br>
&gt;&nbsp; &nbsp; &nbsp;[as wg member] Are you thinking that shifting traffi=
c to a router is<br>
&gt;&nbsp; &nbsp; &nbsp;not going to affect it's jitter/drop rate?<br>
&gt; <br>
&gt; <br>
&gt; Well this is actually the other way around.<br>
&gt; <br>
&gt; First you have your default topology. They you are asked to <br>
&gt; construct&nbsp;new one based on applied constrains.<br>
&gt; <br>
&gt; So you create complete TE coverage and start running end to end data <b=
r>
&gt; plane probing over all TE paths&nbsp;(say SR-TE for specific&nbsp;examp=
le). Once <br>
&gt; you start collecting the probe results you can start excluding&nbsp;pat=
hs <br>
&gt; which do not meet your applied constraints. And that process continues.=
.<br>
&gt; <br>
&gt; To your specific question - It is not that unusual where routers degrad=
e <br>
&gt; their performance&nbsp;with time and in many cases the traffic is not t=
he <br>
&gt; cause for it but internal bugs and malfunctions.<br>
&gt; <br>
&gt; Best,<br>
&gt; R.<br>
&gt; <br>
&gt; _______________________________________________<br>
&gt; Lsr mailing list<br>
&gt; <a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferrer=
" target=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
&gt; <br>
</blockquote></div>
<span>_______________________________________________</span><br><span>Lsr ma=
iling list</span><br><span>Lsr@ietf.org</span><br><span>https://www.ietf.org=
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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Thu, 2 Apr 2020 17:27:27 -0700
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To: Jeff Tantsura <jefftant.ietf@gmail.com>
Cc: Robert Raszuk <robert@raszuk.net>, "lsr@ietf.org" <lsr@ietf.org>,  "Joel M. Halpern" <jmh@joelhalpern.com>
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Subject: Re: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
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Hi Jeff,
excellent question, thank you!
If one wants to empower headends with all the telemetry, then there's no
need to collect it. A method that triggers node-local measurement is
sufficient to calculate node-local performance metrics that may be
periodically exported to a Collector or ... flooded using IGP (no, I
didn't say that!).

Regards,
Greg

On Thu, Apr 2, 2020 at 5:19 PM Jeff Tantsura <jefftant.ietf@gmail.com>
wrote:

> Robert,
>
> We are deviating ;-)
>
> There=E2=80=99s no feedback loop from telemetry producers back to the TE =
headend.
> The telemetry, either end2end or postcards is sent to a  collector that
> has the context of the data and normalizes it so it can be consumed by an
> external system, being centralized or distributed PCE or anything else th=
at
> could make use of it. Do you see IGP anywhere in between?
>
>
> Regards,
> Jeff
>
> On Apr 2, 2020, at 16:03, Robert Raszuk <robert@raszuk.net> wrote:
>
> =EF=BB=BF
> Hi Joel,
>
> > Robert, you seem to be asking that we pass full information about the
> > dynamic network state to all routers
>
> No not at all.
>
> Only TE headends need this information.
>
> To restate ... I am not asking to have a synchronized input to all routes
> in the domain such that their computation would be consistent.
>
> I am only asking for TE headends to be able to select end to end paths
> based on the end to end inband telemetry data. I find this a useful
> requirement missing from any of today's operational deployments.
>
> Many thx,
> R.
>
>
>
>
>
>
> On Fri, Apr 3, 2020 at 12:59 AM Joel M. Halpern <jmh@joelhalpern.com>
> wrote:
>
>> Robert, you seem to be asking that we pass full information about the
>> dynamic network state to all routers so that they can, if needed, serve
>> as fully intelligent path computation engines.  If you want to do that,
>> you will need more than just the telemetry.  You will need the demands
>> that are coming in to all of those routers, so that you can make global
>> decisions sensibly.
>> Which is why we use quasi-centralized path computation engines.
>>
>> Yours,
>> Joel
>>
>> On 4/2/2020 6:16 PM, Robert Raszuk wrote:
>> >
>> >      > If you consider such constrains to provide reachability for
>> >     applications you will likely see value that in-situ telemetry is
>> >     your friend here. Really best friend as without him you can not do
>> >     the proper end to end path exclusion for SPT computations..
>> >
>> >     [as wg member] Are you thinking that shifting traffic to a router =
is
>> >     not going to affect it's jitter/drop rate?
>> >
>> >
>> > Well this is actually the other way around.
>> >
>> > First you have your default topology. They you are asked to
>> > construct new one based on applied constrains.
>> >
>> > So you create complete TE coverage and start running end to end data
>> > plane probing over all TE paths (say SR-TE for specific example). Once
>> > you start collecting the probe results you can start excluding paths
>> > which do not meet your applied constraints. And that process
>> continues...
>> >
>> > To your specific question - It is not that unusual where routers
>> degrade
>> > their performance with time and in many cases the traffic is not the
>> > cause for it but internal bugs and malfunctions.
>> >
>> > Best,
>> > R.
>> >
>> > _______________________________________________
>> > Lsr mailing list
>> > Lsr@ietf.org
>> > https://www.ietf.org/mailman/listinfo/lsr
>> >
>>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>

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<div dir=3D"ltr">Hi Jeff,<div>excellent question, thank you!</div><div>If o=
ne wants to empower headends with all the telemetry, then there&#39;s no ne=
ed to collect it. A method that triggers node-local measurement is sufficie=
nt to calculate node-local performance=C2=A0metrics that may be periodicall=
y exported to a Collector or ... flooded using IGP (no, I didn&#39;t=C2=A0s=
ay that!).</div><div><br></div><div>Regards,</div><div>Greg</div></div><br>=
<div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, Ap=
r 2, 2020 at 5:19 PM Jeff Tantsura &lt;<a href=3D"mailto:jefftant.ietf@gmai=
l.com">jefftant.ietf@gmail.com</a>&gt; wrote:<br></div><blockquote class=3D=
"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(2=
04,204,204);padding-left:1ex"><div dir=3D"auto">Robert,=C2=A0<div><br></div=
><div>We are deviating ;-)<br><div><br></div><div>There=E2=80=99s no feedba=
ck loop from telemetry producers back to the TE headend.</div><div>The tele=
metry, either end2end or postcards is sent to a =C2=A0collector that has th=
e context of the data and normalizes it so it can be consumed by an externa=
l system, being centralized or distributed PCE or anything else that could =
make use of it. Do you see IGP anywhere in between?</div><div><br></div><di=
v><br><div dir=3D"ltr">Regards,<div>Jeff</div></div><div dir=3D"ltr"><br><b=
lockquote type=3D"cite">On Apr 2, 2020, at 16:03, Robert Raszuk &lt;<a href=
=3D"mailto:robert@raszuk.net" target=3D"_blank">robert@raszuk.net</a>&gt; w=
rote:<br><br></blockquote></div><blockquote type=3D"cite"><div dir=3D"ltr">=
=EF=BB=BF<div dir=3D"ltr">Hi Joel,<div><br></div><div>&gt; Robert, you seem=
 to be asking that we pass full information about the<br>&gt; dynamic netwo=
rk state to all routers=C2=A0=C2=A0<br></div><div><br></div><div>No not at =
all.=C2=A0</div><div><br></div><div>Only TE headends=C2=A0need this informa=
tion.=C2=A0</div><div><br></div><div>To restate ... I am not asking to have=
 a synchronized input to all routes in the domain such that their computati=
on would be consistent.=C2=A0</div><div><br></div><div>I am only asking for=
 TE headends=C2=A0to be able to select end to end paths based on the end to=
 end inband telemetry data. I find this a useful requirement missing from a=
ny of today&#39;s operational=C2=A0deployments.=C2=A0</div><div><br></div><=
div>Many thx,<br>R.=C2=A0</div><div><br></div><div><br></div><div><br></div=
><div><br></div><div><br></div></div><br><div class=3D"gmail_quote"><div di=
r=3D"ltr" class=3D"gmail_attr">On Fri, Apr 3, 2020 at 12:59 AM Joel M. Halp=
ern &lt;<a href=3D"mailto:jmh@joelhalpern.com" target=3D"_blank">jmh@joelha=
lpern.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=
=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding=
-left:1ex">Robert, you seem to be asking that we pass full information abou=
t the <br>
dynamic network state to all routers so that they can, if needed, serve <br=
>
as fully intelligent path computation engines.=C2=A0 If you want to do that=
, <br>
you will need more than just the telemetry.=C2=A0 You will need the demands=
 <br>
that are coming in to all of those routers, so that you can make global <br=
>
decisions sensibly.<br>
Which is why we use quasi-centralized path computation engines.<br>
<br>
Yours,<br>
Joel<br>
<br>
On 4/2/2020 6:16 PM, Robert Raszuk wrote:<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0 &gt; If you consider such constrains to provide re=
achability for<br>
&gt;=C2=A0 =C2=A0 =C2=A0applications you will likely see value that in-situ=
 telemetry is<br>
&gt;=C2=A0 =C2=A0 =C2=A0your friend here. Really best friend as without him=
 you can not do<br>
&gt;=C2=A0 =C2=A0 =C2=A0the proper end to end path exclusion for SPT comput=
ations..<br>
&gt; <br>
&gt;=C2=A0 =C2=A0 =C2=A0[as wg member] Are you thinking that shifting traff=
ic to a router is<br>
&gt;=C2=A0 =C2=A0 =C2=A0not going to affect it&#39;s jitter/drop rate?<br>
&gt; <br>
&gt; <br>
&gt; Well this is actually the other way around.<br>
&gt; <br>
&gt; First you have your default topology. They you are asked to <br>
&gt; construct=C2=A0new one based on applied constrains.<br>
&gt; <br>
&gt; So you create complete TE coverage and start running end to end data <=
br>
&gt; plane probing over all TE paths=C2=A0(say SR-TE for specific=C2=A0exam=
ple). Once <br>
&gt; you start collecting the probe results you can start excluding=C2=A0pa=
ths <br>
&gt; which do not meet your applied constraints. And that process continues=
...<br>
&gt; <br>
&gt; To your specific question - It is not that unusual where routers degra=
de <br>
&gt; their performance=C2=A0with time and in many cases the traffic is not =
the <br>
&gt; cause for it but internal bugs and malfunctions.<br>
&gt; <br>
&gt; Best,<br>
&gt; R.<br>
&gt; <br>
&gt; _______________________________________________<br>
&gt; Lsr mailing list<br>
&gt; <a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferre=
r" target=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
&gt; <br>
</blockquote></div>
<span>_______________________________________________</span><br><span>Lsr m=
ailing list</span><br><span><a href=3D"mailto:Lsr@ietf.org" target=3D"_blan=
k">Lsr@ietf.org</a></span><br><span><a href=3D"https://www.ietf.org/mailman=
/listinfo/lsr" target=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr<=
/a></span><br></div></blockquote></div></div></div>________________________=
_______________________<br>
Lsr mailing list<br>
<a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
</blockquote></div>

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Subject: Re: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
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Hi, Jeff:
The draft only propose to transfer the iFIT capability of the Node via the I=
GP protocol, not the telemetry data.
As described in the draft, flooding such capability can assist the controlle=
r(it collects such information via the BGP-LS) to deploy the iFIT function a=
t the path headend.

Aijun Wang
China Telecom

> On Apr 3, 2020, at 08:20, Jeff Tantsura <jefftant.ietf@gmail.com> wrote:
>=20
> =EF=BB=BFRobert,=20
>=20
> We are deviating ;-)
>=20
> There=E2=80=99s no feedback loop from telemetry producers back to the TE h=
eadend.
> The telemetry, either end2end or postcards is sent to a  collector that ha=
s the context of the data and normalizes it so it can be consumed by an exte=
rnal system, being centralized or distributed PCE or anything else that coul=
d make use of it. Do you see IGP anywhere in between?
>=20
>=20
> Regards,
> Jeff
>=20
>>> On Apr 2, 2020, at 16:03, Robert Raszuk <robert@raszuk.net> wrote:
>>>=20
>> =EF=BB=BF
>> Hi Joel,
>>=20
>> > Robert, you seem to be asking that we pass full information about the
>> > dynamic network state to all routers =20
>>=20
>> No not at all.=20
>>=20
>> Only TE headends need this information.=20
>>=20
>> To restate ... I am not asking to have a synchronized input to all routes=
 in the domain such that their computation would be consistent.=20
>>=20
>> I am only asking for TE headends to be able to select end to end paths ba=
sed on the end to end inband telemetry data. I find this a useful requiremen=
t missing from any of today's operational deployments.=20
>>=20
>> Many thx,
>> R.=20
>>=20
>>=20
>>=20
>>=20
>>=20
>>=20
>>> On Fri, Apr 3, 2020 at 12:59 AM Joel M. Halpern <jmh@joelhalpern.com> wr=
ote:
>>> Robert, you seem to be asking that we pass full information about the=20=

>>> dynamic network state to all routers so that they can, if needed, serve=20=

>>> as fully intelligent path computation engines.  If you want to do that,=20=

>>> you will need more than just the telemetry.  You will need the demands=20=

>>> that are coming in to all of those routers, so that you can make global=20=

>>> decisions sensibly.
>>> Which is why we use quasi-centralized path computation engines.
>>>=20
>>> Yours,
>>> Joel
>>>=20
>>> On 4/2/2020 6:16 PM, Robert Raszuk wrote:
>>> >=20
>>> >      > If you consider such constrains to provide reachability for
>>> >     applications you will likely see value that in-situ telemetry is
>>> >     your friend here. Really best friend as without him you can not do=

>>> >     the proper end to end path exclusion for SPT computations..
>>> >=20
>>> >     [as wg member] Are you thinking that shifting traffic to a router i=
s
>>> >     not going to affect it's jitter/drop rate?
>>> >=20
>>> >=20
>>> > Well this is actually the other way around.
>>> >=20
>>> > First you have your default topology. They you are asked to=20
>>> > construct new one based on applied constrains.
>>> >=20
>>> > So you create complete TE coverage and start running end to end data=20=

>>> > plane probing over all TE paths (say SR-TE for specific example). Once=
=20
>>> > you start collecting the probe results you can start excluding paths=20=

>>> > which do not meet your applied constraints. And that process continues=
...
>>> >=20
>>> > To your specific question - It is not that unusual where routers degra=
de=20
>>> > their performance with time and in many cases the traffic is not the=20=

>>> > cause for it but internal bugs and malfunctions.
>>> >=20
>>> > Best,
>>> > R.
>>> >=20
>>> > _______________________________________________
>>> > Lsr mailing list
>>> > Lsr@ietf.org
>>> > https://www.ietf.org/mailman/listinfo/lsr
>>> >=20
>> _______________________________________________
>> Lsr mailing list
>> Lsr@ietf.org
>> https://www.ietf.org/mailman/listinfo/lsr
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr

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	charset=utf-8
Content-Transfer-Encoding: quoted-printable

<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Hi, Jeff:<div>The draft only propose to tra=
nsfer the iFIT capability of the Node via the IGP protocol, not the telemetr=
y data.</div><div>As described in the draft, flooding such capability can as=
sist the controller(it collects such information via the BGP-LS) to deploy t=
he iFIT function at the path headend.<br><br><div dir=3D"ltr">Aijun Wang<div=
>China Telecom</div></div><div dir=3D"ltr"><br><blockquote type=3D"cite">On A=
pr 3, 2020, at 08:20, Jeff Tantsura &lt;jefftant.ietf@gmail.com&gt; wrote:<b=
r><br></blockquote></div><blockquote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF=
<meta http-equiv=3D"content-type" content=3D"text/html; charset=3Dutf-8">Rob=
ert,&nbsp;<div><br></div><div>We are deviating ;-)<br><div><br></div><div>Th=
ere=E2=80=99s no feedback loop from telemetry producers back to the TE heade=
nd.</div><div>The telemetry, either end2end or postcards is sent to a &nbsp;=
collector that has the context of the data and normalizes it so it can be co=
nsumed by an external system, being centralized or distributed PCE or anythi=
ng else that could make use of it. Do you see IGP anywhere in between?</div>=
<div><br></div><div><br><div dir=3D"ltr">Regards,<div>Jeff</div></div><div d=
ir=3D"ltr"><br><blockquote type=3D"cite">On Apr 2, 2020, at 16:03, Robert Ra=
szuk &lt;robert@raszuk.net&gt; wrote:<br><br></blockquote></div><blockquote t=
ype=3D"cite"><div dir=3D"ltr">=EF=BB=BF<div dir=3D"ltr">Hi Joel,<div><br></d=
iv><div>&gt; Robert, you seem to be asking that we pass full information abo=
ut the<br>&gt; dynamic network state to all routers&nbsp;&nbsp;<br></div><di=
v><br></div><div>No not at all.&nbsp;</div><div><br></div><div>Only TE heade=
nds&nbsp;need this information.&nbsp;</div><div><br></div><div>To restate ..=
. I am not asking to have a synchronized input to all routes in the domain s=
uch that their computation would be consistent.&nbsp;</div><div><br></div><d=
iv>I am only asking for TE headends&nbsp;to be able to select end to end pat=
hs based on the end to end inband telemetry data. I find this a useful requi=
rement missing from any of today's operational&nbsp;deployments.&nbsp;</div>=
<div><br></div><div>Many thx,<br>R.&nbsp;</div><div><br></div><div><br></div=
><div><br></div><div><br></div><div><br></div></div><br><div class=3D"gmail_=
quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, Apr 3, 2020 at 12:59 AM=
 Joel M. Halpern &lt;<a href=3D"mailto:jmh@joelhalpern.com">jmh@joelhalpern.=
com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margi=
n:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"=
>Robert, you seem to be asking that we pass full information about the <br>
dynamic network state to all routers so that they can, if needed, serve <br>=

as fully intelligent path computation engines.&nbsp; If you want to do that,=
 <br>
you will need more than just the telemetry.&nbsp; You will need the demands <=
br>
that are coming in to all of those routers, so that you can make global <br>=

decisions sensibly.<br>
Which is why we use quasi-centralized path computation engines.<br>
<br>
Yours,<br>
Joel<br>
<br>
On 4/2/2020 6:16 PM, Robert Raszuk wrote:<br>
&gt; <br>
&gt;&nbsp; &nbsp; &nbsp; &gt; If you consider such constrains to provide rea=
chability for<br>
&gt;&nbsp; &nbsp; &nbsp;applications you will likely see value that in-situ t=
elemetry is<br>
&gt;&nbsp; &nbsp; &nbsp;your friend here. Really best friend as without him y=
ou can not do<br>
&gt;&nbsp; &nbsp; &nbsp;the proper end to end path exclusion for SPT computa=
tions..<br>
&gt; <br>
&gt;&nbsp; &nbsp; &nbsp;[as wg member] Are you thinking that shifting traffi=
c to a router is<br>
&gt;&nbsp; &nbsp; &nbsp;not going to affect it's jitter/drop rate?<br>
&gt; <br>
&gt; <br>
&gt; Well this is actually the other way around.<br>
&gt; <br>
&gt; First you have your default topology. They you are asked to <br>
&gt; construct&nbsp;new one based on applied constrains.<br>
&gt; <br>
&gt; So you create complete TE coverage and start running end to end data <b=
r>
&gt; plane probing over all TE paths&nbsp;(say SR-TE for specific&nbsp;examp=
le). Once <br>
&gt; you start collecting the probe results you can start excluding&nbsp;pat=
hs <br>
&gt; which do not meet your applied constraints. And that process continues.=
..<br>
&gt; <br>
&gt; To your specific question - It is not that unusual where routers degrad=
e <br>
&gt; their performance&nbsp;with time and in many cases the traffic is not t=
he <br>
&gt; cause for it but internal bugs and malfunctions.<br>
&gt; <br>
&gt; Best,<br>
&gt; R.<br>
&gt; <br>
&gt; _______________________________________________<br>
&gt; Lsr mailing list<br>
&gt; <a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferrer=
" target=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
&gt; <br>
</blockquote></div>
<span>_______________________________________________</span><br><span>Lsr ma=
iling list</span><br><span>Lsr@ietf.org</span><br><span>https://www.ietf.org=
/mailman/listinfo/lsr</span><br></div></blockquote></div></div><span>_______=
________________________________________</span><br><span>Lsr mailing list</s=
pan><br><span>Lsr@ietf.org</span><br><span>https://www.ietf.org/mailman/list=
info/lsr</span><br></div></blockquote></div></body></html>=

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From: Tianran Zhou <zhoutianran@huawei.com>
To: Robert Raszuk <robert@raszuk.net>, Jeff Tantsura <jefftant.ietf@gmail.com>
CC: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>, Christian Hopps <chopps@chopps.org>, "Acee Lindem (acee)" <acee@cisco.com>, wangyali <wangyali11@huawei.com>
Thread-Topic: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
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From: Jeff Tantsura <jefftant.ietf@gmail.com>
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To: Aijun Wang <wangaijun@tsinghua.org.cn>
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Subject: Re: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
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Hi Aijun,

I understand very well what you are trying to achieve and don=E2=80=99t argu=
e the need for it.  My point however - routing protocols are not the most su=
itable transport for it.

Regards,
Jeff

> On Apr 2, 2020, at 19:39, Aijun Wang <wangaijun@tsinghua.org.cn> wrote:
>=20
> =EF=BB=BFHi, Jeff:
> The draft only propose to transfer the iFIT capability of the Node via the=
 IGP protocol, not the telemetry data.
> As described in the draft, flooding such capability can assist the control=
ler(it collects such information via the BGP-LS) to deploy the iFIT function=
 at the path headend.
>=20
> Aijun Wang
> China Telecom
>=20
>>> On Apr 3, 2020, at 08:20, Jeff Tantsura <jefftant.ietf@gmail.com> wrote:=

>>>=20
>> =EF=BB=BFRobert,=20
>>=20
>> We are deviating ;-)
>>=20
>> There=E2=80=99s no feedback loop from telemetry producers back to the TE h=
eadend.
>> The telemetry, either end2end or postcards is sent to a  collector that h=
as the context of the data and normalizes it so it can be consumed by an ext=
ernal system, being centralized or distributed PCE or anything else that cou=
ld make use of it. Do you see IGP anywhere in between?
>>=20
>>=20
>> Regards,
>> Jeff
>>=20
>>>> On Apr 2, 2020, at 16:03, Robert Raszuk <robert@raszuk.net> wrote:
>>>>=20
>>> =EF=BB=BF
>>> Hi Joel,
>>>=20
>>> > Robert, you seem to be asking that we pass full information about the
>>> > dynamic network state to all routers =20
>>>=20
>>> No not at all.=20
>>>=20
>>> Only TE headends need this information.=20
>>>=20
>>> To restate ... I am not asking to have a synchronized input to all route=
s in the domain such that their computation would be consistent.=20
>>>=20
>>> I am only asking for TE headends to be able to select end to end paths b=
ased on the end to end inband telemetry data. I find this a useful requireme=
nt missing from any of today's operational deployments.=20
>>>=20
>>> Many thx,
>>> R.=20
>>>=20
>>>=20
>>>=20
>>>=20
>>>=20
>>>=20
>>>> On Fri, Apr 3, 2020 at 12:59 AM Joel M. Halpern <jmh@joelhalpern.com> w=
rote:
>>>> Robert, you seem to be asking that we pass full information about the=20=

>>>> dynamic network state to all routers so that they can, if needed, serve=
=20
>>>> as fully intelligent path computation engines.  If you want to do that,=
=20
>>>> you will need more than just the telemetry.  You will need the demands=20=

>>>> that are coming in to all of those routers, so that you can make global=
=20
>>>> decisions sensibly.
>>>> Which is why we use quasi-centralized path computation engines.
>>>>=20
>>>> Yours,
>>>> Joel
>>>>=20
>>>> On 4/2/2020 6:16 PM, Robert Raszuk wrote:
>>>> >=20
>>>> >      > If you consider such constrains to provide reachability for
>>>> >     applications you will likely see value that in-situ telemetry is
>>>> >     your friend here. Really best friend as without him you can not d=
o
>>>> >     the proper end to end path exclusion for SPT computations..
>>>> >=20
>>>> >     [as wg member] Are you thinking that shifting traffic to a router=
 is
>>>> >     not going to affect it's jitter/drop rate?
>>>> >=20
>>>> >=20
>>>> > Well this is actually the other way around.
>>>> >=20
>>>> > First you have your default topology. They you are asked to=20
>>>> > construct new one based on applied constrains.
>>>> >=20
>>>> > So you create complete TE coverage and start running end to end data=20=

>>>> > plane probing over all TE paths (say SR-TE for specific example). Onc=
e=20
>>>> > you start collecting the probe results you can start excluding paths=20=

>>>> > which do not meet your applied constraints. And that process continue=
s...
>>>> >=20
>>>> > To your specific question - It is not that unusual where routers degr=
ade=20
>>>> > their performance with time and in many cases the traffic is not the=20=

>>>> > cause for it but internal bugs and malfunctions.
>>>> >=20
>>>> > Best,
>>>> > R.
>>>> >=20
>>>> > _______________________________________________
>>>> > Lsr mailing list
>>>> > Lsr@ietf.org
>>>> > https://www.ietf.org/mailman/listinfo/lsr
>>>> >=20
>>> _______________________________________________
>>> Lsr mailing list
>>> Lsr@ietf.org
>>> https://www.ietf.org/mailman/listinfo/lsr
>> _______________________________________________
>> Lsr mailing list
>> Lsr@ietf.org
>> https://www.ietf.org/mailman/listinfo/lsr

--Apple-Mail-1144B4DD-BD27-4444-BAE6-70FB30FE6AAC
Content-Type: text/html;
	charset=utf-8
Content-Transfer-Encoding: quoted-printable

<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Hi Aijun,<div><br></div><div>I understand v=
ery well what you are trying to achieve and don=E2=80=99t argue the need for=
 it. &nbsp;My point however - routing protocols are not the most suitable tr=
ansport for it.<br><br><div dir=3D"ltr">Regards,<div>Jeff</div></div><div di=
r=3D"ltr"><br><blockquote type=3D"cite">On Apr 2, 2020, at 19:39, Aijun Wang=
 &lt;wangaijun@tsinghua.org.cn&gt; wrote:<br><br></blockquote></div><blockqu=
ote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF<meta http-equiv=3D"content-type=
" content=3D"text/html; charset=3Dutf-8">Hi, Jeff:<div>The draft only propos=
e to transfer the iFIT capability of the Node via the IGP protocol, not the t=
elemetry data.</div><div>As described in the draft, flooding such capability=
 can assist the controller(it collects such information via the BGP-LS) to d=
eploy the iFIT function at the path headend.<br><br><div dir=3D"ltr">Aijun W=
ang<div>China Telecom</div></div><div dir=3D"ltr"><br><blockquote type=3D"ci=
te">On Apr 3, 2020, at 08:20, Jeff Tantsura &lt;jefftant.ietf@gmail.com&gt; w=
rote:<br><br></blockquote></div><blockquote type=3D"cite"><div dir=3D"ltr">=EF=
=BB=BF<meta http-equiv=3D"content-type" content=3D"text/html; charset=3Dutf-=
8">Robert,&nbsp;<div><br></div><div>We are deviating ;-)<br><div><br></div><=
div>There=E2=80=99s no feedback loop from telemetry producers back to the TE=
 headend.</div><div>The telemetry, either end2end or postcards is sent to a &=
nbsp;collector that has the context of the data and normalizes it so it can b=
e consumed by an external system, being centralized or distributed PCE or an=
ything else that could make use of it. Do you see IGP anywhere in between?</=
div><div><br></div><div><br><div dir=3D"ltr">Regards,<div>Jeff</div></div><d=
iv dir=3D"ltr"><br><blockquote type=3D"cite">On Apr 2, 2020, at 16:03, Rober=
t Raszuk &lt;robert@raszuk.net&gt; wrote:<br><br></blockquote></div><blockqu=
ote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF<div dir=3D"ltr">Hi Joel,<div><b=
r></div><div>&gt; Robert, you seem to be asking that we pass full informatio=
n about the<br>&gt; dynamic network state to all routers&nbsp;&nbsp;<br></di=
v><div><br></div><div>No not at all.&nbsp;</div><div><br></div><div>Only TE h=
eadends&nbsp;need this information.&nbsp;</div><div><br></div><div>To restat=
e ... I am not asking to have a synchronized input to all routes in the doma=
in such that their computation would be consistent.&nbsp;</div><div><br></di=
v><div>I am only asking for TE headends&nbsp;to be able to select end to end=
 paths based on the end to end inband telemetry data. I find this a useful r=
equirement missing from any of today's operational&nbsp;deployments.&nbsp;</=
div><div><br></div><div>Many thx,<br>R.&nbsp;</div><div><br></div><div><br><=
/div><div><br></div><div><br></div><div><br></div></div><br><div class=3D"gm=
ail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, Apr 3, 2020 at 12:5=
9 AM Joel M. Halpern &lt;<a href=3D"mailto:jmh@joelhalpern.com">jmh@joelhalp=
ern.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"m=
argin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:=
1ex">Robert, you seem to be asking that we pass full information about the <=
br>
dynamic network state to all routers so that they can, if needed, serve <br>=

as fully intelligent path computation engines.&nbsp; If you want to do that,=
 <br>
you will need more than just the telemetry.&nbsp; You will need the demands <=
br>
that are coming in to all of those routers, so that you can make global <br>=

decisions sensibly.<br>
Which is why we use quasi-centralized path computation engines.<br>
<br>
Yours,<br>
Joel<br>
<br>
On 4/2/2020 6:16 PM, Robert Raszuk wrote:<br>
&gt; <br>
&gt;&nbsp; &nbsp; &nbsp; &gt; If you consider such constrains to provide rea=
chability for<br>
&gt;&nbsp; &nbsp; &nbsp;applications you will likely see value that in-situ t=
elemetry is<br>
&gt;&nbsp; &nbsp; &nbsp;your friend here. Really best friend as without him y=
ou can not do<br>
&gt;&nbsp; &nbsp; &nbsp;the proper end to end path exclusion for SPT computa=
tions..<br>
&gt; <br>
&gt;&nbsp; &nbsp; &nbsp;[as wg member] Are you thinking that shifting traffi=
c to a router is<br>
&gt;&nbsp; &nbsp; &nbsp;not going to affect it's jitter/drop rate?<br>
&gt; <br>
&gt; <br>
&gt; Well this is actually the other way around.<br>
&gt; <br>
&gt; First you have your default topology. They you are asked to <br>
&gt; construct&nbsp;new one based on applied constrains.<br>
&gt; <br>
&gt; So you create complete TE coverage and start running end to end data <b=
r>
&gt; plane probing over all TE paths&nbsp;(say SR-TE for specific&nbsp;examp=
le). Once <br>
&gt; you start collecting the probe results you can start excluding&nbsp;pat=
hs <br>
&gt; which do not meet your applied constraints. And that process continues.=
..<br>
&gt; <br>
&gt; To your specific question - It is not that unusual where routers degrad=
e <br>
&gt; their performance&nbsp;with time and in many cases the traffic is not t=
he <br>
&gt; cause for it but internal bugs and malfunctions.<br>
&gt; <br>
&gt; Best,<br>
&gt; R.<br>
&gt; <br>
&gt; _______________________________________________<br>
&gt; Lsr mailing list<br>
&gt; <a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferrer=
" target=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
&gt; <br>
</blockquote></div>
<span>_______________________________________________</span><br><span>Lsr ma=
iling list</span><br><span>Lsr@ietf.org</span><br><span>https://www.ietf.org=
/mailman/listinfo/lsr</span><br></div></blockquote></div></div><span>_______=
________________________________________</span><br><span>Lsr mailing list</s=
pan><br><span>Lsr@ietf.org</span><br><span>https://www.ietf.org/mailman/list=
info/lsr</span><br></div></blockquote></div></div></blockquote></div></body>=
</html>=

--Apple-Mail-1144B4DD-BD27-4444-BAE6-70FB30FE6AAC--


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From: Tianran Zhou <zhoutianran@huawei.com>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, Christian Hopps <chopps@chopps.org>, Robert Raszuk <robert@raszuk.net>
CC: wangyali <wangyali11@huawei.com>, "Acee Lindem (acee)" <acee@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
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From: Peter Psenak <ppsenak@cisco.com>
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Subject: Re: [Lsr] Dynamic flooding path computation
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Hi Tony,

it may be worth to make your algorithm one of the standardized 
distributed algorithms. There might be some work to make it 
deterministic, like the selection rules mentioned below, but it should 
be doable.

What do you think?

thanks,
Peter

On 03/04/2020 01:57, tony.li@tony.li wrote:
> Hi,
> 
> In this morning’s session, Acee asked a question about node selection as part of path computation.  I would like to expound a bit in the spirit of full transparency.
> 
> First off, the selection of nodes is NOT vital to the algorithm.  That said, we found that applying some heuristics helped make the algorithm slightly more efficient in some cases.
> 
> We select the starting node for the first cycle (n0 in the slides) by picking a node with the highest possible degree in the base topology.  Ideally, we’d really like to pick the node that’s at the center of the graph (and to be very precise, a node in the centroid or Jordan center), but the computation of this is somewhat expensive and doesn’t seem worthwhile.
> 
> At the end of the first cycle, we now have a set of bi-connected nodes that each have a degree of 2 in the flooding topology.  We could start the next iteration with any of these nodes, but we already know that n0 has the highest degree of anything in the topology, so we can always start the next iteration based off of n0.  Note that we do NOT want to continue doing this for subsequent iterations because the degree of n0 would quickly spiral out of control.  Instead, we want to continue to bound the degree of the nodes in the flooding topology, so we want to select a node that is on the flooding topology, but minimizes both degree and diameter.  Again, we are not trying for optimality, so we apply a simple weighting function to aid in this selection.
> 
> I hope this makes our approach very clear.
> 
> Regards,
> Tony
> 
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
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> 


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From: Robert Raszuk <robert@raszuk.net>
Date: Fri, 3 Apr 2020 11:59:24 +0200
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Subject: Re: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02
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Hi Tony,

I think there is still some disconnect - so in an attempt to at least make
sure that we have difference of opinions let me try to restate what I was
suggesting.

IGP would only carry indication if tail can do inband telemetry or not - it
would *not* carry any telemetry data. IGP would not be running telemetry -
it will be just consumer of other subsystem product.
https://tools.ietf.org/html/draft-wang-lsr-ifit-node-capability-advertiseme=
nt-00
just signals capability. It does not even have a trunk for any type of dump
:)

Global optimization makes a lot of sense for traffic spread across given
network - 100%. But it is not the best place to only select if one path is
eligible and the other is not in given topology. That decision should
happen on the headends and should be as much distributed as possible. And
the data here as input to the decision is only valid on specific headend
probes depart from. Besides it has usually a very short life.

Even if we move cspf to historic just very recently flexible algorithm was
proposed and I think is progressing fine. So my examples of use cases to
choose paths with min drops or bound jitter are real.

Hi Jeff,

If I look at one of the in situ data plane proposals it does send the
results to the sender/originator vs some
collector. draft-lapukhov-dataplane-probe-01 This is besides the point of
this discussion as we are not asking for IGP to carry the results. Hint:
Each headend can be a collector or nothing breaks in the design if headend
get's this data out of band from central collector.

Thx,
R.


On Fri, Apr 3, 2020 at 1:43 AM <tony.li@tony.li> wrote:

>
> Sure it is possible to discover if my tailends are capable of handling in
> band telemetry by off line means. But what I am struggling to see why we
> allowed so much TE stuff into IGPs and we do not want to make it easier f=
or
> headends to operate without PCE at all for the purpose of delivering
> such type of services.
>
>
>
> AFAICT, we put a lot of effort into making headend path computation usefu=
l
> and, for the most part, it was and is not necessary.
>
> Even with legacy mechanisms, people decided that they need global
> optimization and that head-end path computation was Not That Interesting.
>
> It=E2=80=99s now 20 years later, the network is even more dynamic, the
> expectations about response time are that much higher, and concerns about
> link state database stability and scalability have increased.  Modern
> telemetry is definitely not suitable to be passed in the IGP anymore.
>
> Thus, it seems like the IGP can provide base topology information and
> traffic engineering constructs should leverage that and provide an
> independent telemetry collection plane. Within that plane, telemetry
> capabilities can and should be confined to the telemetry plane.
>
> As we=E2=80=99ve said many times before: BGP is not a dump truck. Analogo=
usly, the
> IGP isn=E2=80=99t even an SUV.
>
> ;-)
>
> Regards,
> Tony
>
>

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<div dir=3D"ltr">Hi Tony,<br><div><br></div><div>I think there is still som=
e disconnect - so in an attempt to at least make sure that we have differen=
ce of opinions let me try to restate what I was suggesting.=C2=A0</div><div=
><br></div><div>IGP would only carry indication if tail can do inband telem=
etry or not - it would *not* carry any telemetry data. IGP would not be run=
ning telemetry - it will be just consumer of other subsystem product.=C2=A0=
<a href=3D"https://tools.ietf.org/html/draft-wang-lsr-ifit-node-capability-=
advertisement-00">https://tools.ietf.org/html/draft-wang-lsr-ifit-node-capa=
bility-advertisement-00</a> just signals capability. It does not even have =
a trunk for any type of dump :)</div><div><br></div><div>Global optimizatio=
n makes a lot of sense for traffic spread across given network - 100%. But =
it is not the best place to only select if one path is eligible and the oth=
er is not in given topology. That decision should happen on the headends an=
d should be as much distributed as possible. And the data here as input to =
the decision is only valid on specific=C2=A0headend probes depart from. Bes=
ides it has usually a very short life.=C2=A0</div><div><br></div><div>Even =
if we move cspf to historic just very recently flexible algorithm was propo=
sed and I think is progressing fine. So my examples of use cases to choose =
paths with min drops or bound jitter are real.=C2=A0</div><div><br></div><d=
iv>Hi Jeff,</div><div><br></div><div>If I look at one of the in situ data p=
lane proposals it does send the results to the sender/originator vs some co=
llector.=C2=A0draft-lapukhov-dataplane-probe-01 This is besides the point o=
f this discussion as we are not asking for IGP to carry the results. Hint: =
Each headend can be a collector or nothing breaks in the design if headend =
get&#39;s this data out of band from central collector.=C2=A0</div><div><br=
></div><div>Thx,</div><div>R.</div><div><br></div></div><br><div class=3D"g=
mail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, Apr 3, 2020 at 1:=
43 AM &lt;<a href=3D"mailto:tony.li@tony.li">tony.li@tony.li</a>&gt; wrote:=
<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8=
ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style=3D"o=
verflow-wrap: break-word;"><div><br><blockquote type=3D"cite"><div><span st=
yle=3D"font-family:Helvetica;font-size:14px;font-style:normal;font-variant-=
caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-=
indent:0px;text-transform:none;white-space:normal;word-spacing:0px;text-dec=
oration:none;float:none;display:inline">Sure it is possible to discover if =
my tailends are capable of handling in band telemetry by off line means. Bu=
t what I am struggling to see why we allowed so much TE stuff into IGPs and=
 we do not want to make it easier for headends to operate without PCE at al=
l for the purpose of delivering such=C2=A0type of services.=C2=A0</span></d=
iv></blockquote></div><br><div><br></div><div>AFAICT, we put a lot of effor=
t into making headend path computation useful and, for the most part, it wa=
s and is not necessary.</div><div><br></div><div>Even with legacy mechanism=
s, people decided that they need global optimization and that head-end path=
 computation was Not That Interesting.</div><div><br></div><div>It=E2=80=99=
s now 20 years later, the network is even more dynamic, the expectations ab=
out response time are that much higher, and concerns about link state datab=
ase stability and scalability have increased.=C2=A0 Modern telemetry is def=
initely not suitable to be passed in the IGP anymore. =C2=A0</div><div><br>=
</div><div>Thus, it seems like the IGP can provide base topology informatio=
n and traffic engineering constructs should leverage that and provide an in=
dependent telemetry collection plane. Within that plane, telemetry capabili=
ties can and should be confined to the telemetry plane.</div><div><br></div=
><div>As we=E2=80=99ve said many times before: BGP is not a dump truck. Ana=
logously, the IGP isn=E2=80=99t even an SUV.</div><div><br></div><div>;-)</=
div><div><br></div><div>Regards,</div><div>Tony</div><div><br></div></div><=
/blockquote></div>

--00000000000072c9d305a25ff98f--


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From: <bruno.decraene@orange.com>
To: Christian Hopps <chopps@chopps.org>, Robert Raszuk <robert@raszuk.net>
CC: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>, Jeff Tantsura <jefftant.ietf@gmail.com>, Tianran Zhou <zhoutianran@huawei.com>, "Acee Lindem (acee)" <acee@cisco.com>, wangyali <wangyali11@huawei.com>
Thread-Topic: [Lsr] problem joining interim [Re:  A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02]
Thread-Index: AQHWCTocjQ5490kuCEOn6C2rZSeArahnH9QA
Date: Fri, 3 Apr 2020 10:14:17 +0000
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References: <1520992FC97B944A9979C2FC1D7DB0F404DB1AD4@dggeml524-mbx.china.huawei.com> <MW3PR11MB4619361A2CA3A402A44914E5C1FE0@MW3PR11MB4619.namprd11.prod.outlook.com> <1520992FC97B944A9979C2FC1D7DB0F404DB2336@dggeml524-mbx.china.huawei.com> <68249E56-5702-4C15-9748-439E43F3EB0E@chopps.org> <1520992FC97B944A9979C2FC1D7DB0F404DEFC14@dggeml524-mbx.china.huawei.com> <A937FECB-2013-403E-89B2-47971514F6CF@chopps.org> <80a8f83c76d447dda48280495b3a80a7@huawei.com> <6F0E8437-5D82-4FAC-A061-69E56E1E161D@chopps.org> <2189e17f36764960bf2dcc554cde9ce0@huawei.com> <MW3PR11MB4619925BEF83B0C4512DD284C1C90@MW3PR11MB4619.namprd11.prod.outlook.com> <06e8443210924ac788c40fa15972cbdd@huawei.com> <C987B657-64D1-4C70-B471-ED9F1266B990@cisco.com> <3948044C-0CC9-4AE8-8541-4D23A5DF396E@cisco.com> <1520992FC97B944A9979C2FC1D7DB0F404DF089E@dggeml524-mbx.china.huawei.com> <MW3PR11MB46197F8C43B3200B07641838C1C60@MW3PR11MB4619.namprd11.prod.outlook.com> <CAOj+MMGsVkws0sTw4RRdb_SdWvsuh+2Dxc-upXqT2_pmpO_+Lg@mail.gmail.com> <6930807B-2FF0-4A5C-AD39-D05345C37A5E@chopps.org> <MW3PR11MB461955420610E933ACC44BC4C1C60@MW3PR11MB4619.namprd11.prod.outlook.com> <CAOj+MMHoTbDzZrA1ttPsdD5Tk7TADaR=ex5WGF=6+X3X1utoHg@mail.gmail.com> <bd193457-956c-47b0-a50b-8d1778e8349a@Spark> <CAOj+MMGuRHVoJ3ez4nQ3O87J4U+-+yabYWeA1AEfj1UGAbPp7w@mail.gmail.com> <3DFEBF57-427E-425E-B5D2-48F683519D16@chopps.org>
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Subject: Re: [Lsr] problem joining interim [Re:  A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02]
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Chris,=20

Please see inline.


> From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Christian Hopps
> Sent: Friday, April 3, 2020 12:00 AM
> To: Robert Raszuk
>=20
>=20
>=20
> > On Apr 2, 2020, at 5:17 PM, Robert Raszuk <robert@raszuk.net> wrote:
> >=20
> > Many thx,
> > R.
> >=20
> > PS. As we are talking LSR here it is strange that joining virtual LSR m=
eeting is not for everyone. I was waiting and tried three times today for h=
ost approval to join which was not granted.=20
> >=20
>=20
> I am very sorry to hear this! We had 64 participants, at least at one poi=
nt that I saw. I set the meeting up, and I don't believe there is any way t=
o exclude anyone in particular, I certainly would never have chosen to do t=
hat.
>=20
> However, Webex has a password requirement when setting up meetings (I gue=
ss, I tried to not have one, it wouldn't let me) which we included in all t=
he details wherever the details were posted, it was "linkstate".
>=20
> I did notice an email, from webex, during the meeting about a request fro=
m Bruno to join as guest, but he was in the participant list when I then ch=
ecked.
>=20

So may be my experience may help for next time(s). See below.

An email from the IESG secretary was sent on 2020-03-19, saying "Informatio=
n about remote participation: https://ietf.webex.com/meet/lsr "
Hence I used that URL.
On this webex, the meeting did not start on time so I've waited for some ti=
me. Then 10-15 minutes past the start, I decided to 'notify the host', but =
never got accepted on the webex.
At that point I assumed a technical issue with webex and monitored the mail=
ing list, but no one was complaining, which is not inline with typical IETF=
 reaction ;-) .
So I assumed the error was only on my side and I searched for more emails a=
nd found one from Chris (2020-03-31) saying that the URL was https://ietf.w=
ebex.com/ietf/j.php?MTID=3Dmbef20efa9e66c7e97f9d6b18ea84eca8=20
And this one worked fine.
My guess is that the 'interim' webex did not use the 'lsr' webex. Also the =
'official' notification from the IESG secretary with the incorrect webex UR=
L did not helped.

--Bruno
=20
> I didn't receive any other emails like that (and FWIW I had 5 windows ove=
r 2 monitors going at once trying to manage all this, so noticing the 1 ema=
il was lucky).
>=20
> Did it let you skip entering a password (or did it not offer the option i=
n the first place)?
>=20
> It would be good to figure this out before the next interim.
>
> Thanks,
> Chris.
>=20
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr

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References: <1520992FC97B944A9979C2FC1D7DB0F404DB1AD4@dggeml524-mbx.china.huawei.com> <MW3PR11MB4619361A2CA3A402A44914E5C1FE0@MW3PR11MB4619.namprd11.prod.outlook.com> <1520992FC97B944A9979C2FC1D7DB0F404DB2336@dggeml524-mbx.china.huawei.com> <68249E56-5702-4C15-9748-439E43F3EB0E@chopps.org> <1520992FC97B944A9979C2FC1D7DB0F404DEFC14@dggeml524-mbx.china.huawei.com> <A937FECB-2013-403E-89B2-47971514F6CF@chopps.org> <80a8f83c76d447dda48280495b3a80a7@huawei.com> <6F0E8437-5D82-4FAC-A061-69E56E1E161D@chopps.org> <2189e17f36764960bf2dcc554cde9ce0@huawei.com> <MW3PR11MB4619925BEF83B0C4512DD284C1C90@MW3PR11MB4619.namprd11.prod.outlook.com> <06e8443210924ac788c40fa15972cbdd@huawei.com> <C987B657-64D1-4C70-B471-ED9F1266B990@cisco.com> <3948044C-0CC9-4AE8-8541-4D23A5DF396E@cisco.com> <1520992FC97B944A9979C2FC1D7DB0F404DF089E@dggeml524-mbx.china.huawei.com> <MW3PR11MB46197F8C43B3200B07641838C1C60@MW3PR11MB4619.namprd11.prod.outlook.com> <CAOj+MMGsVkws0sTw4RRdb_SdWvsuh+2Dxc-upXqT2_pmpO_+Lg@mail.gmail.com> <6930807B-2FF0-4A5C-AD39-D05345C37A5E@chopps.org> <MW3PR11MB461955420610E933ACC44BC4C1C60@MW3PR11MB4619.namprd11.prod.outlook.com> <CAOj+MMHoTbDzZrA1ttPsdD5Tk7TADaR=ex5WGF=6+X3X1utoHg@mail.gmail.com> <bd193457-956c-47b0-a50b-8d1778e8349a@Spark> <CAOj+MMGuRHVoJ3ez4nQ3O87J4U+-+yabYWeA1AEfj1UGAbPp7w@mail.gmail.com> <3DFEBF57-427E-425E-B5D2-48F683519D16@chopps.org> <4764_1585908857_5E870C79_4764_208_1_53C29892C857584299CBF5D05346208A48E0BE48@OPEXCAUBM43.corporate.adroot.infra.ftgroup>
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From: Robert Raszuk <robert@raszuk.net>
Date: Fri, 3 Apr 2020 12:22:44 +0200
Message-ID: <CAOj+MMEiCpxEMd4=rm6zk=DewMWW87o7yWhAbov7wBkWiqqy7w@mail.gmail.com>
To: Bruno Decraene <bruno.decraene@orange.com>
Cc: Christian Hopps <chopps@chopps.org>, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>,  Jeff Tantsura <jefftant.ietf@gmail.com>, Tianran Zhou <zhoutianran@huawei.com>, "Acee Lindem (acee)" <acee@cisco.com>, wangyali <wangyali11@huawei.com>
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Subject: Re: [Lsr] problem joining interim [Re: A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02]
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--000000000000dd176d05a2604cb4
Content-Type: text/plain; charset="UTF-8"

Ahh for the record I used that URL yesterday:

An email from the IESG secretary was sent on 2020-03-19, saying
"Information about remote participation: https://ietf.webex.com/meet/lsr "

On Fri, Apr 3, 2020 at 12:14 PM <bruno.decraene@orange.com> wrote:

> Chris,
>
> Please see inline.
>
>
> > From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Christian Hopps
> > Sent: Friday, April 3, 2020 12:00 AM
> > To: Robert Raszuk
> >
> >
> >
> > > On Apr 2, 2020, at 5:17 PM, Robert Raszuk <robert@raszuk.net> wrote:
> > >
> > > Many thx,
> > > R.
> > >
> > > PS. As we are talking LSR here it is strange that joining virtual LSR
> meeting is not for everyone. I was waiting and tried three times today for
> host approval to join which was not granted.
> > >
> >
> > I am very sorry to hear this! We had 64 participants, at least at one
> point that I saw. I set the meeting up, and I don't believe there is any
> way to exclude anyone in particular, I certainly would never have chosen to
> do that.
> >
> > However, Webex has a password requirement when setting up meetings (I
> guess, I tried to not have one, it wouldn't let me) which we included in
> all the details wherever the details were posted, it was "linkstate".
> >
> > I did notice an email, from webex, during the meeting about a request
> from Bruno to join as guest, but he was in the participant list when I then
> checked.
> >
>
> So may be my experience may help for next time(s). See below.
>
> An email from the IESG secretary was sent on 2020-03-19, saying
> "Information about remote participation: https://ietf.webex.com/meet/lsr "
> Hence I used that URL.
> On this webex, the meeting did not start on time so I've waited for some
> time. Then 10-15 minutes past the start, I decided to 'notify the host',
> but never got accepted on the webex.
> At that point I assumed a technical issue with webex and monitored the
> mailing list, but no one was complaining, which is not inline with typical
> IETF reaction ;-) .
> So I assumed the error was only on my side and I searched for more emails
> and found one from Chris (2020-03-31) saying that the URL was
> https://ietf.webex.com/ietf/j.php?MTID=mbef20efa9e66c7e97f9d6b18ea84eca8
> And this one worked fine.
> My guess is that the 'interim' webex did not use the 'lsr' webex. Also the
> 'official' notification from the IESG secretary with the incorrect webex
> URL did not helped.
>
> --Bruno
>
> > I didn't receive any other emails like that (and FWIW I had 5 windows
> over 2 monitors going at once trying to manage all this, so noticing the 1
> email was lucky).
> >
> > Did it let you skip entering a password (or did it not offer the option
> in the first place)?
> >
> > It would be good to figure this out before the next interim.
> >
> > Thanks,
> > Chris.
> >
> > _______________________________________________
> > Lsr mailing list
> > Lsr@ietf.org
> > https://www.ietf.org/mailman/listinfo/lsr
>
>
> _________________________________________________________________________________________________________________________
>
> Ce message et ses pieces jointes peuvent contenir des informations
> confidentielles ou privilegiees et ne doivent donc
> pas etre diffuses, exploites ou copies sans autorisation. Si vous avez
> recu ce message par erreur, veuillez le signaler
> a l'expediteur et le detruire ainsi que les pieces jointes. Les messages
> electroniques etant susceptibles d'alteration,
> Orange decline toute responsabilite si ce message a ete altere, deforme ou
> falsifie. Merci.
>
> This message and its attachments may contain confidential or privileged
> information that may be protected by law;
> they should not be distributed, used or copied without authorisation.
> If you have received this email in error, please notify the sender and
> delete this message and its attachments.
> As emails may be altered, Orange is not liable for messages that have been
> modified, changed or falsified.
> Thank you.
>
>

--000000000000dd176d05a2604cb4
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div><br></div>Ahh for the record I used that URL yesterda=
y:<div><br></div><div>An email from the IESG secretary was sent on 2020-03-=
19, saying &quot;Information about remote participation:=C2=A0<a href=3D"ht=
tps://ietf.webex.com/meet/lsr" rel=3D"noreferrer" target=3D"_blank">https:/=
/ietf.webex.com/meet/lsr</a>=C2=A0&quot;=C2=A0=C2=A0<br></div></div><br><di=
v class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, Apr 3=
, 2020 at 12:14 PM &lt;<a href=3D"mailto:bruno.decraene@orange.com">bruno.d=
ecraene@orange.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote=
" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);=
padding-left:1ex">Chris, <br>
<br>
Please see inline.<br>
<br>
<br>
&gt; From: Lsr [mailto:<a href=3D"mailto:lsr-bounces@ietf.org" target=3D"_b=
lank">lsr-bounces@ietf.org</a>] On Behalf Of Christian Hopps<br>
&gt; Sent: Friday, April 3, 2020 12:00 AM<br>
&gt; To: Robert Raszuk<br>
&gt; <br>
&gt; <br>
&gt; <br>
&gt; &gt; On Apr 2, 2020, at 5:17 PM, Robert Raszuk &lt;<a href=3D"mailto:r=
obert@raszuk.net" target=3D"_blank">robert@raszuk.net</a>&gt; wrote:<br>
&gt; &gt; <br>
&gt; &gt; Many thx,<br>
&gt; &gt; R.<br>
&gt; &gt; <br>
&gt; &gt; PS. As we are talking LSR here it is strange that joining virtual=
 LSR meeting is not for everyone. I was waiting and tried three times today=
 for host approval to join which was not granted. <br>
&gt; &gt; <br>
&gt; <br>
&gt; I am very sorry to hear this! We had 64 participants, at least at one =
point that I saw. I set the meeting up, and I don&#39;t believe there is an=
y way to exclude anyone in particular, I certainly would never have chosen =
to do that.<br>
&gt; <br>
&gt; However, Webex has a password requirement when setting up meetings (I =
guess, I tried to not have one, it wouldn&#39;t let me) which we included i=
n all the details wherever the details were posted, it was &quot;linkstate&=
quot;.<br>
&gt; <br>
&gt; I did notice an email, from webex, during the meeting about a request =
from Bruno to join as guest, but he was in the participant list when I then=
 checked.<br>
&gt; <br>
<br>
So may be my experience may help for next time(s). See below.<br>
<br>
An email from the IESG secretary was sent on 2020-03-19, saying &quot;Infor=
mation about remote participation: <a href=3D"https://ietf.webex.com/meet/l=
sr" rel=3D"noreferrer" target=3D"_blank">https://ietf.webex.com/meet/lsr</a=
> &quot;<br>
Hence I used that URL.<br>
On this webex, the meeting did not start on time so I&#39;ve waited for som=
e time. Then 10-15 minutes past the start, I decided to &#39;notify the hos=
t&#39;, but never got accepted on the webex.<br>
At that point I assumed a technical issue with webex and monitored the mail=
ing list, but no one was complaining, which is not inline with typical IETF=
 reaction ;-) .<br>
So I assumed the error was only on my side and I searched for more emails a=
nd found one from Chris (2020-03-31) saying that the URL was <a href=3D"htt=
ps://ietf.webex.com/ietf/j.php?MTID=3Dmbef20efa9e66c7e97f9d6b18ea84eca8" re=
l=3D"noreferrer" target=3D"_blank">https://ietf.webex.com/ietf/j.php?MTID=
=3Dmbef20efa9e66c7e97f9d6b18ea84eca8</a> <br>
And this one worked fine.<br>
My guess is that the &#39;interim&#39; webex did not use the &#39;lsr&#39; =
webex. Also the &#39;official&#39; notification from the IESG secretary wit=
h the incorrect webex URL did not helped.<br>
<br>
--Bruno<br>
<br>
&gt; I didn&#39;t receive any other emails like that (and FWIW I had 5 wind=
ows over 2 monitors going at once trying to manage all this, so noticing th=
e 1 email was lucky).<br>
&gt; <br>
&gt; Did it let you skip entering a password (or did it not offer the optio=
n in the first place)?<br>
&gt; <br>
&gt; It would be good to figure this out before the next interim.<br>
&gt;<br>
&gt; Thanks,<br>
&gt; Chris.<br>
&gt; <br>
&gt; _______________________________________________<br>
&gt; Lsr mailing list<br>
&gt; <a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
&gt; <a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferre=
r" target=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
<br>
___________________________________________________________________________=
______________________________________________<br>
<br>
Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc<br>
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler<br>
a l&#39;expediteur et le detruire ainsi que les pieces jointes. Les message=
s electroniques etant susceptibles d&#39;alteration,<br>
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.<br>
<br>
This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;<br>
they should not be distributed, used or copied without authorisation.<br>
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.<br>
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.<br>
Thank you.<br>
<br>
</blockquote></div>

--000000000000dd176d05a2604cb4--


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From: Christian Hopps <chopps@chopps.org>
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Date: Fri, 3 Apr 2020 06:26:12 -0400
Cc: Christian Hopps <chopps@chopps.org>, Robert Raszuk <robert@raszuk.net>, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>, Jeff Tantsura <jefftant.ietf@gmail.com>, Tianran Zhou <zhoutianran@huawei.com>, "Acee Lindem (acee)" <acee@cisco.com>, wangyali <wangyali11@huawei.com>
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To: bruno.decraene@orange.com
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/ubUv-c2-usf_MvfuDBXIiyyiC50>
Subject: Re: [Lsr] problem joining interim [Re:  A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02]
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Hi Bruno,

This is very useful feedback. It looks like that link the secretary =
posted simply tries to join a standing open room associated with the LSR =
webex account. This is frustrating b/c I sent an email to the secretary =
asking if I'd done things correctly. I'm not sure they are aware that =
the link they send is no good so I will contact them again.

Thanks,
Chris.

> On Apr 3, 2020, at 6:14 AM, bruno.decraene@orange.com wrote:
>=20
> Chris,=20
>=20
> Please see inline.
>=20
>=20
>> From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Christian Hopps
>> Sent: Friday, April 3, 2020 12:00 AM
>> To: Robert Raszuk
>>=20
>>=20
>>=20
>>> On Apr 2, 2020, at 5:17 PM, Robert Raszuk <robert@raszuk.net> wrote:
>>>=20
>>> Many thx,
>>> R.
>>>=20
>>> PS. As we are talking LSR here it is strange that joining virtual =
LSR meeting is not for everyone. I was waiting and tried three times =
today for host approval to join which was not granted.=20
>>>=20
>>=20
>> I am very sorry to hear this! We had 64 participants, at least at one =
point that I saw. I set the meeting up, and I don't believe there is any =
way to exclude anyone in particular, I certainly would never have chosen =
to do that.
>>=20
>> However, Webex has a password requirement when setting up meetings (I =
guess, I tried to not have one, it wouldn't let me) which we included in =
all the details wherever the details were posted, it was "linkstate".
>>=20
>> I did notice an email, from webex, during the meeting about a request =
from Bruno to join as guest, but he was in the participant list when I =
then checked.
>>=20
>=20
> So may be my experience may help for next time(s). See below.
>=20
> An email from the IESG secretary was sent on 2020-03-19, saying =
"Information about remote participation: https://ietf.webex.com/meet/lsr =
"
> Hence I used that URL.
> On this webex, the meeting did not start on time so I've waited for =
some time. Then 10-15 minutes past the start, I decided to 'notify the =
host', but never got accepted on the webex.
> At that point I assumed a technical issue with webex and monitored the =
mailing list, but no one was complaining, which is not inline with =
typical IETF reaction ;-) .
> So I assumed the error was only on my side and I searched for more =
emails and found one from Chris (2020-03-31) saying that the URL was =
https://ietf.webex.com/ietf/j.php?MTID=3Dmbef20efa9e66c7e97f9d6b18ea84eca8=
=20
> And this one worked fine.
> My guess is that the 'interim' webex did not use the 'lsr' webex. Also =
the 'official' notification from the IESG secretary with the incorrect =
webex URL did not helped.
>=20
> --Bruno
>=20
>> I didn't receive any other emails like that (and FWIW I had 5 windows =
over 2 monitors going at once trying to manage all this, so noticing the =
1 email was lucky).
>>=20
>> Did it let you skip entering a password (or did it not offer the =
option in the first place)?
>>=20
>> It would be good to figure this out before the next interim.
>>=20
>> Thanks,
>> Chris.
>>=20
>> _______________________________________________
>> Lsr mailing list
>> Lsr@ietf.org
>> https://www.ietf.org/mailman/listinfo/lsr
>=20
> =
__________________________________________________________________________=
_______________________________________________
>=20
> Ce message et ses pieces jointes peuvent contenir des informations =
confidentielles ou privilegiees et ne doivent donc
> pas etre diffuses, exploites ou copies sans autorisation. Si vous avez =
recu ce message par erreur, veuillez le signaler
> a l'expediteur et le detruire ainsi que les pieces jointes. Les =
messages electroniques etant susceptibles d'alteration,
> Orange decline toute responsabilite si ce message a ete altere, =
deforme ou falsifie. Merci.
>=20
> This message and its attachments may contain confidential or =
privileged information that may be protected by law;
> they should not be distributed, used or copied without authorisation.
> If you have received this email in error, please notify the sender and =
delete this message and its attachments.
> As emails may be altered, Orange is not liable for messages that have =
been modified, changed or falsified.
> Thank you.
>=20
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr


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From: Alvaro Retana <alvaro.retana@futurewei.com>
To: "tony.li@tony.li" <tony.li@tony.li>, "lsr@ietf.org" <lsr@ietf.org>
CC: Martin Vigoureux <martin.vigoureux@nokia.com>
Thread-Topic: [Lsr] On collaboration for abstraction
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Subject: Re: [Lsr] On collaboration for abstraction
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From: Lou Berger <lberger@labn.net>
To: Robert Raszuk <robert@raszuk.net>, Christian Hopps <chopps@chopps.org>
CC: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, <lsr@ietf.org>, Jeff Tantsura <jefftant.ietf@gmail.com>, Tianran Zhou <zhoutianran@huawei.com>, "Acee Lindem (acee)" <acee@cisco.com>, wangyali <wangyali11@huawei.com>
Date: Fri, 03 Apr 2020 06:38:41 -0400
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Subject: Re: [Lsr] problem joining interim [Re: A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02]
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Fwiw I used the link in the agenda without issue.  I did the same for RAW 
last week.  Also, as host of a different wg interim right before lsr, I 
didn't have to do anything to let people in to the session - they just 
showed up....

Lou


----------
On April 2, 2020 6:10:43 PM Robert Raszuk <robert@raszuk.net> wrote:

> Hi Chris,
>
> I never noticed the password ...
>
> Just few days back I participated in IDR and no password was needed or
> perhaps webex invite link contained a token relaxing from needing one.
>
> Cheers,
> R.
>
> On Fri, Apr 3, 2020 at 12:00 AM Christian Hopps <chopps@chopps.org> wrote:
>
>>
>>
>> > On Apr 2, 2020, at 5:17 PM, Robert Raszuk <robert@raszuk.net> wrote:
>> >
>> > Many thx,
>> > R.
>> >
>> > PS. As we are talking LSR here it is strange that joining virtual LSR
>> meeting is not for everyone. I was waiting and tried three times today for
>> host approval to join which was not granted.
>> >
>>
>> I am very sorry to hear this! We had 64 participants, at least at one
>> point that I saw. I set the meeting up, and I don't believe there is any
>> way to exclude anyone in particular, I certainly would never have chosen to
>> do that.
>>
>> However, Webex has a password requirement when setting up meetings (I
>> guess, I tried to not have one, it wouldn't let me) which we included in
>> all the details wherever the details were posted, it was "linkstate".
>>
>> I did notice an email, from webex, during the meeting about a request from
>> Bruno to join as guest, but he was in the participant list when I then
>> checked. I didn't receive any other emails like that (and FWIW I had 5
>> windows over 2 monitors going at once trying to manage all this, so
>> noticing the 1 email was lucky).
>>
>> Did it let you skip entering a password (or did it not offer the option in
>> the first place)?
>>
>> It would be good to figure this out before the next interim.
>>
>> Thanks,
>> Chris.
>>
>> _______________________________________________
>> Lsr mailing list
>> Lsr@ietf.org
>> https://www.ietf.org/mailman/listinfo/lsr
>>
>
>
>
> ----------
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>

------------1713f9f12ac798b277b8677cbf
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<html>
<body>
<div style=3D"color: black;">
<div style=3D"color: black;">
<p style=3D"margin: 0 0 1em 0; color: black;">Fwiw I used the link in the a=
genda without issue.&nbsp; I did the same for RAW last week.&nbsp; Also, as=
 host of a different wg interim right before lsr, I didn't have to do anyth=
ing to let people in to the session - they just showed up....</p>
<p style=3D"margin: 0 0 1em 0; color: black;">Lou</p>
</div>
<div style=3D"color: black;">
<hr style=3D"border: none; border-top: solid #D0D0D0 1.0pt;">
<p style=3D"color: black; font-size: 10pt; font-family: sans-serif; margin:=
 8pt 0;">On April 2, 2020 6:10:43 PM Robert Raszuk &lt;robert@raszuk.net&gt=
; wrote:</p>
<blockquote type=3D"cite" class=3D"gmail_quote" style=3D"margin: 0 0 0 0.75=
ex; border-left: 1px solid #808080; padding-left: 0.75ex;">
<div dir=3D"ltr">Hi Chris,<div><br></div><div>I never noticed the password =
....=C2=A0</div><div><br></div><div>Just few days back I participated in ID=
R and no password=C2=A0was needed or perhaps webex invite link contained a =
token relaxing from needing one.=C2=A0</div><div><br></div><div>Cheers,<br>=
R..</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gma=
il_attr">On Fri, Apr 3, 2020 at 12:00 AM Christian Hopps &lt;<a href=3D"mai=
lto:chopps@chopps.org">chopps@chopps.org</a>&gt; wrote:<br></div><blockquot=
e class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px s=
olid rgb(204,204,204);padding-left:1ex"><br>
<br>
&gt; On Apr 2, 2020, at 5:17 PM, Robert Raszuk &lt;<a href=3D"mailto:robert=
@raszuk.net" target=3D"_blank">robert@raszuk.net</a>&gt; wrote:<br>
&gt; <br>
&gt; Many thx,<br>
&gt; R.<br>
&gt; <br>
&gt; PS. As we are talking LSR here it is strange that joining virtual LSR =
meeting is not for everyone. I was waiting and tried three times today for =
host approval to join which was not granted. <br>
&gt; <br>
<br>
I am very sorry to hear this! We had 64 participants, at least at one point=
 that I saw. I set the meeting up, and I don&#39;t believe there is any way=
 to exclude anyone in particular, I certainly would never have chosen to do=
 that.<br>
<br>
However, Webex has a password requirement when setting up meetings (I guess=
, I tried to not have one, it wouldn&#39;t let me) which we included in all=
 the details wherever the details were posted, it was &quot;linkstate&quot;=
..<br>
<br>
I did notice an email, from webex, during the meeting about a request from =
Bruno to join as guest, but he was in the participant list when I then chec=
ked. I didn&#39;t receive any other emails like that (and FWIW I had 5 wind=
ows over 2 monitors going at once trying to manage all this, so noticing th=
e 1 email was lucky).<br>
<br>
Did it let you skip entering a password (or did it not offer the option in =
the first place)?<br>
<br>
It would be good to figure this out before the next interim.<br>
<br>
Thanks,<br>
Chris.<br>
<br>
_______________________________________________<br>
Lsr mailing list<br>
<a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
</blockquote></div>

<div>_______________________________________________</div>
<div>Lsr mailing list</div>
<div><a class=3D"aqm-autolink aqm-autowrap" href=3D"mailto:Lsr%40ietf.org">=
Lsr@ietf.org</a></div>
<div><a class=3D"aqm-autolink aqm-autowrap" href=3D"https://www.ietf.org/ma=
ilman/listinfo/lsr">https://www.ietf.org/mailman/listinfo/lsr</a></div>
<div><br></div>
</blockquote>
</div>
</div>
</body>
</html>

------------1713f9f12ac798b277b8677cbf--


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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Christian Hopps <chopps@chopps.org>, "bruno.decraene@orange.com" <bruno.decraene@orange.com>
CC: Robert Raszuk <robert@raszuk.net>, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>, Jeff Tantsura <jefftant.ietf@gmail.com>, Tianran Zhou <zhoutianran@huawei.com>, wangyali <wangyali11@huawei.com>
Thread-Topic: [Lsr] problem joining interim [Re:  A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02]
Thread-Index: AQHWCaCr9XJ5+F8g6Uer0MLnoYSLeqhnMVYA///GZAA=
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Subject: Re: [Lsr] problem joining interim [Re:  A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02]
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From nobody Fri Apr  3 04:05:26 2020
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From: IESG Secretary <iesg-secretary@ietf.org>
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Date: Fri, 03 Apr 2020 04:05:24 -0700
Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/anCdHg3K3YKZ-q68K3krm_kafHo>
Subject: [Lsr] Link State Routing (lsr) WG Virtual Meeting: 2020-04-29 CHANGED
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MEETING DETAILS HAVE CHANGED.  SEE LATEST DETAILS BELOW.

The Link State Routing (lsr) Working Group will hold
a virtual interim meeting on 2020-04-29 from 10:00 to 12:00 America/Detroit (14:00 to 16:00 UTC).

Agenda:
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&lt;p class=&quot;p1&quot;&gt;&lt;span class=&quot;s1&quot;&gt;&lt;b&gt;LSR Interim Agenda &lt;/b&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p class=&quot;p2&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Chairs: Acee Lindem&lt;/span&gt;&lt;/p&gt;
&lt;p class=&quot;p2&quot;&gt;&lt;span class=&quot;s1&quot;&gt;            Chris Hopps&lt;/span&gt;&lt;/p&gt;
&lt;p class=&quot;p2&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Secretary: Yingzhen Qu&lt;/span&gt;&lt;/p&gt;
&lt;p class=&quot;p2&quot;&gt;&lt;span class=&quot;s1&quot;&gt; &lt;/span&gt;&lt;/p&gt;
&lt;p class=&quot;p3&quot;&gt;&lt;span class=&quot;s2&quot;&gt;WG Status Web Page: &lt;a href=&quot;http://tools.ietf.org/wg/lsr/&quot;&gt;&lt;span class=&quot;s3&quot;&gt;http://tools.ietf.org/wg/lsr/&lt;/span&gt;&lt;/a&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p class=&quot;p1&quot;&gt;&lt;span class=&quot;s1&quot;&gt; &lt;/span&gt;&lt;/p&gt;
&lt;p class=&quot;p1&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Session #1&lt;/span&gt;&lt;/p&gt;
&lt;p class=&quot;p2&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Date: Thursday, 02 April 2020 &lt;/span&gt;&lt;/p&gt;
&lt;p class=&quot;p2&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Start Time: 09:00 America/New_York&lt;/span&gt;&lt;/p&gt;
&lt;p class=&quot;p2&quot;&gt;&lt;span class=&quot;s1&quot;&gt; &lt;/span&gt;&lt;/p&gt;
&lt;p class=&quot;p4&quot;&gt;&lt;span class=&quot;s1&quot;&gt;JOIN WEBEX MEETING&lt;/span&gt;&lt;/p&gt;
&lt;p class=&quot;p5&quot;&gt;&lt;span class=&quot;s4&quot;&gt;&lt;a href=&quot;https://ietf.webex.com/ietf/j.php?MTID=mbef20efa9e66c7e97f9d6b18ea84eca8&quot;&gt;https://ietf.webex.com/ietf/j.php?MTID=mbef20efa9e66c7e97f9d6b18ea84eca8&lt;/a&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p class=&quot;p4&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Meeting number (access code): 617 996 556&lt;/span&gt;&lt;/p&gt;
&lt;p class=&quot;p4&quot;&gt;&lt;span class=&quot;s1&quot;&gt; &lt;/span&gt;&lt;/p&gt;
&lt;p class=&quot;p4&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Host key: 199278&lt;/span&gt;&lt;/p&gt;
&lt;p class=&quot;p4&quot;&gt;&lt;span class=&quot;s1&quot;&gt; &lt;/span&gt;&lt;/p&gt;
&lt;p class=&quot;p4&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Meeting password: linkstate&lt;/span&gt;&lt;/p&gt;
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    &lt;tr&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td1&quot;&gt;
        &lt;p class=&quot;p1&quot;&gt;&lt;span class=&quot;s1&quot;&gt;&lt;b&gt;Time&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td2&quot;&gt;
        &lt;p class=&quot;p1&quot;&gt;&lt;span class=&quot;s1&quot;&gt;&lt;b&gt;Length&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td3&quot;&gt;
        &lt;p class=&quot;p1&quot;&gt;&lt;span class=&quot;s1&quot;&gt;&lt;b&gt;Topic/Draft&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td4&quot;&gt;
        &lt;p class=&quot;p1&quot;&gt;&lt;span class=&quot;s1&quot;&gt;&lt;b&gt;Who&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
    &lt;/tr&gt;
    &lt;tr&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td1&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;9:00&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td2&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;5m&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td3&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Administrivia&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td4&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Acee/Chris&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
    &lt;/tr&gt;
    &lt;tr&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td1&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;9:05 &lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td2&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;10m&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td3&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;IGP Flexible Algorithm&lt;/span&gt;&lt;/p&gt;
        &lt;p class=&quot;p8&quot;&gt;&lt;span class=&quot;s4&quot;&gt;&lt;a href=&quot;https://datatracker.ietf.org/doc/draft-ietf-lsr-flex-algo/&quot;&gt;https://datatracker.ietf.org/doc/draft-ietf-lsr-flex-algo/&lt;span class=&quot;s5&quot;&gt;&lt;/span&gt;&lt;/a&gt;&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td4&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Peter Psenak&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
    &lt;/tr&gt;
    &lt;tr&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td1&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;9:15&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td2&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;15m&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td3&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;An Algorithm for Computing Dynamic Flooding Topologies&lt;/span&gt;&lt;/p&gt;
        &lt;p class=&quot;p9&quot;&gt;&lt;span class=&quot;s4&quot;&gt;https://datatracker.ietf.org/doc/draft-chen-lsr-dynamic-flooding-algorithm/ &lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td4&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Sarah Chen&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
    &lt;/tr&gt;
    &lt;tr&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td1&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;9:30&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td2&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;15m&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td3&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Hierarchical IS-IS&lt;/span&gt;&lt;/p&gt;
        &lt;p class=&quot;p10&quot;&gt;&lt;span class=&quot;s4&quot;&gt;&lt;a href=&quot;https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-extended-hierarchy/&quot;&gt;https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-extended-hierarchy/&lt;/a&gt;&lt;/span&gt;&lt;span class=&quot;s1&quot;&gt; &lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td4&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Tony Li&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
    &lt;/tr&gt;
    &lt;tr&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td1&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;9:45&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td2&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;15m&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td3&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Area Proxy&lt;/span&gt;&lt;/p&gt;
        &lt;p class=&quot;p11&quot;&gt;&lt;span class=&quot;s4&quot;&gt;&lt;a href=&quot;https://datatracker.ietf.org/doc/draft-li-lsr-isis-area-proxy/&quot;&gt;https://datatracker.ietf.org/doc/draft-li-lsr-isis-area-proxy/&lt;/a&gt;&lt;/span&gt;&lt;span class=&quot;s1&quot;&gt;  &lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td4&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Tony Li&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
    &lt;/tr&gt;
    &lt;tr&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td1&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;10:00&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td2&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;10m&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td3&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Topology-Transparent Zone&lt;/span&gt;&lt;/p&gt;
        &lt;p class=&quot;p10&quot;&gt;&lt;span class=&quot;s4&quot;&gt;&lt;a href=&quot;https://datatracker.ietf.org/doc/draft-chen-isis-ttz/&quot;&gt;https://datatracker.ietf.org/doc/draft-chen-isis-ttz/&lt;/a&gt;&lt;/span&gt;&lt;span class=&quot;s1&quot;&gt; &lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td4&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Huaimo Chen&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
    &lt;/tr&gt;
    &lt;tr&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td1&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;10:10&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td2&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;10m&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td3&quot;&gt;
        &lt;p class=&quot;p12&quot;&gt;&lt;span class=&quot;s1&quot;&gt;IS-IS Flood Reflection&lt;/span&gt;&lt;/p&gt;
        &lt;p class=&quot;p11&quot;&gt;&lt;span class=&quot;s4&quot;&gt;&lt;a href=&quot;https://datatracker.ietf.org/doc/draft-przygienda-lsr-flood-reflection/&quot;&gt;https://datatracker.ietf.org/doc/draft-przygienda-lsr-flood-reflection/&lt;/a&gt;&lt;/span&gt;&lt;span class=&quot;s6&quot;&gt;&lt;span class=&quot;Apple-converted-space&quot;&gt; &lt;/span&gt;&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td4&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Tony Przygienda&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
    &lt;/tr&gt;
    &lt;tr&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td1&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;10:20 &lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td2&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;10m&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td3&quot;&gt;
        &lt;p class=&quot;p12&quot;&gt;&lt;span class=&quot;s1&quot;&gt;IGP for Network High Availability&lt;/span&gt;&lt;/p&gt;
        &lt;p class=&quot;p11&quot;&gt;&lt;span class=&quot;s4&quot;&gt;https://datatracker.ietf.org/doc/draft-chen-lsr-ctr-availability/&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td4&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Huaimo Chen&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
    &lt;/tr&gt;
    &lt;tr&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td1&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;10:30&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td2&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;10m&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td3&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Passive Interface Attribute&lt;/span&gt;&lt;/p&gt;
        &lt;p class=&quot;p13&quot;&gt;&lt;span class=&quot;s4&quot;&gt;&lt;a href=&quot;https://tools.ietf.org/html/draft-wang-lsr-passive-interface-attribute-00&quot;&gt;https://tools.ietf.org/html/draft-wang-lsr-passive-interface-attribute-00&lt;span class=&quot;s7&quot;&gt;&lt;/span&gt;&lt;/a&gt;&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td4&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Huaimo Chen/Aijun Wang &lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
    &lt;/tr&gt;
    &lt;tr&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td1&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;10:40&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td2&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;15m&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td3&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;IGP Extensions for Advertising IFIT Node Capability&lt;/span&gt;&lt;/p&gt;
        &lt;p class=&quot;p10&quot;&gt;&lt;span class=&quot;s4&quot;&gt;&lt;a href=&quot;https://datatracker.ietf.org/doc/draft-liu-lsr-isis-ifit-node-capability/&quot;&gt;https://datatracker.ietf.org/doc/draft-liu-lsr-isis-ifit-node-capability/&lt;/a&gt;&lt;/span&gt;&lt;span class=&quot;s1&quot;&gt; &lt;/span&gt;&lt;/p&gt;
        &lt;p class=&quot;p10&quot;&gt;&lt;span class=&quot;s4&quot;&gt;&lt;a href=&quot;https://datatracker.ietf.org/doc/draft-wang-lsr-ospf-ifit-node-capability/&quot;&gt;https://datatracker.ietf.org/doc/draft-wang-lsr-ospf-ifit-node-capability/&lt;/a&gt;&lt;/span&gt;&lt;span class=&quot;s1&quot;&gt; &lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td4&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Yali Wang&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
    &lt;/tr&gt;
    &lt;tr&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td1&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;10:55&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td2&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;20m &lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td3&quot;&gt;
        &lt;p class=&quot;p14&quot;&gt;&lt;span class=&quot;s1&quot;&gt;IGP Extensions for Segment Routing based Enhanced VPN&lt;/span&gt;&lt;/p&gt;
        &lt;p class=&quot;p8&quot;&gt;&lt;span class=&quot;s4&quot;&gt;&lt;a href=&quot;https://datatracker.ietf.org/doc/draft-dong-lsr-sr-enhanced-vpn/&quot;&gt;https://datatracker.ietf.org/doc/draft-dong-lsr-sr-enhanced-vpn/&lt;/a&gt;&lt;/span&gt;&lt;span class=&quot;s8&quot;&gt; &lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td4&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Jie Dong&lt;/span&gt;&lt;/p&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt; &lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
    &lt;/tr&gt;
    &lt;tr&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td1&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt; &lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td2&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt; &lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td3&quot;&gt;
        &lt;p class=&quot;p14&quot;&gt;&lt;span class=&quot;s1&quot;&gt; &lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td4&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt; &lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
    &lt;/tr&gt;
  &lt;/tbody&gt;
&lt;/table&gt;
&lt;p class=&quot;p15&quot;&gt;&lt;span class=&quot;s1&quot;&gt; &lt;/span&gt;&lt;/p&gt;
&lt;p class=&quot;p15&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Session #2&lt;/span&gt;&lt;/p&gt;
&lt;p class=&quot;p2&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Date: Wednesday, 29 April 2020 &lt;/span&gt;&lt;/p&gt;
&lt;p class=&quot;p2&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Start Time: 10:00 America/New_York&lt;/span&gt;&lt;/p&gt;
&lt;p class=&quot;p16&quot;&gt;&lt;span class=&quot;s1&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;/p&gt;
&lt;p class=&quot;p4&quot;&gt;&lt;span class=&quot;s1&quot;&gt;JOIN WEBEX MEETING&lt;/span&gt;&lt;/p&gt;
&lt;p class=&quot;p5&quot;&gt;&lt;span class=&quot;s4&quot;&gt;&lt;a href=&quot;https://ietf.webex.com/ietf/j.php?MTID=m2c9ca5147e9fc849121cf804641ad1b5&quot;&gt;https://ietf.webex.com/ietf/j.php?MTID=m2c9ca5147e9fc849121cf804641ad1b5&lt;/a&gt;&lt;/span&gt;&lt;/p&gt;
&lt;p class=&quot;p4&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Meeting number (access code): 616 091 577&lt;/span&gt;&lt;/p&gt;
&lt;p class=&quot;p4&quot;&gt;&lt;span class=&quot;s1&quot;&gt; &lt;/span&gt;&lt;/p&gt;
&lt;p class=&quot;p4&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Host key: 115251&lt;/span&gt;&lt;/p&gt;
&lt;p class=&quot;p4&quot;&gt;&lt;span class=&quot;s1&quot;&gt; &lt;/span&gt;&lt;/p&gt;
&lt;p class=&quot;p4&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Meeting password: linkstate&lt;/span&gt;&lt;/p&gt;
&lt;p class=&quot;p16&quot;&gt;&lt;span class=&quot;s1&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;/p&gt;
&lt;p class=&quot;p15&quot;&gt;&lt;span class=&quot;s1&quot;&gt; &lt;/span&gt;&lt;/p&gt;
&lt;table cellspacing=&quot;0&quot; cellpadding=&quot;0&quot;&gt;
  &lt;tbody&gt;
    &lt;tr&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td1&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;10:00&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td2&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;5m&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td3&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Administrivia&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td4&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Acee/Chris&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
    &lt;/tr&gt;
    &lt;tr&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td1&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;10:05&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td2&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;15m&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td3&quot;&gt;
        &lt;p class=&quot;p14&quot;&gt;&lt;span class=&quot;s1&quot;&gt;IS-IS Flooding Parameters Advertisement&lt;span class=&quot;Apple-converted-space&quot;&gt; &lt;/span&gt;&lt;/span&gt;&lt;/p&gt;
        &lt;p class=&quot;p11&quot;&gt;&lt;span class=&quot;s4&quot;&gt;&lt;a href=&quot;https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/&quot;&gt;https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/&lt;span class=&quot;s7&quot;&gt;&lt;/span&gt;&lt;/a&gt;&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td4&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Bruno Decraene&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
    &lt;/tr&gt;
    &lt;tr&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td1&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;10:20&lt;span class=&quot;Apple-converted-space&quot;&gt; &lt;/span&gt;&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td2&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;10m&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td3&quot;&gt;
        &lt;p class=&quot;p14&quot;&gt;&lt;span class=&quot;s1&quot;&gt;IS-IS Flooding Scale Considerations&lt;/span&gt;&lt;/p&gt;
        &lt;p class=&quot;p11&quot;&gt;&lt;span class=&quot;s4&quot;&gt;&lt;a href=&quot;https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/&quot;&gt;https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/&lt;span class=&quot;s7&quot;&gt;&lt;/span&gt;&lt;/a&gt;&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td4&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;Les Ginsberg&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
    &lt;/tr&gt;
    &lt;tr&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td1&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;10:30&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td2&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt;open&lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td3&quot;&gt;
        &lt;p class=&quot;p12&quot;&gt;&lt;span class=&quot;s4&quot;&gt;Flooding Parameters/Scale discussion&lt;/span&gt;&lt;/p&gt;
        &lt;p class=&quot;p12&quot;&gt;&lt;span class=&quot;s4&quot;&gt; &lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
      &lt;td valign=&quot;top&quot; class=&quot;td4&quot;&gt;
        &lt;p class=&quot;p7&quot;&gt;&lt;span class=&quot;s1&quot;&gt; &lt;/span&gt;&lt;/p&gt;
      &lt;/td&gt;
    &lt;/tr&gt;
  &lt;/tbody&gt;
&lt;/table&gt;
&lt;p class=&quot;p15&quot;&gt;&lt;span class=&quot;s1&quot;&gt; &lt;/span&gt;&lt;/p&gt;
&lt;/body&gt;
&lt;/html&gt;

Information about remote participation:
URL: https://ietf.webex.com/ietf/j.php?MTID=m2c9ca5147e9fc849121cf804641ad1b5

https://datatracker.ietf.org/meeting/interim-2020-lsr-02/materials/agenda-interim-2020-lsr-02-lsr-01.html


From nobody Fri Apr  3 04:22:27 2020
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From: Christian Hopps <chopps@chopps.org>
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Subject: Re: [Lsr] Link State Routing (lsr) WG Virtual Meeting: 2020-04-29 CHANGED
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Well that's sub-optimal.

Contacting tools team about this.

Thanks,
Chris.

> On Apr 3, 2020, at 7:05 AM, IESG Secretary <iesg-secretary@ietf.org> =
wrote:
>=20
> MEETING DETAILS HAVE CHANGED.  SEE LATEST DETAILS BELOW.
>=20
> The Link State Routing (lsr) Working Group will hold
> a virtual interim meeting on 2020-04-29 from 10:00 to 12:00 =
America/Detroit (14:00 to 16:00 UTC).
>=20
> Agenda:
> &lt;html&gt;
> &lt;head&gt;
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> &lt;body&gt;
> &lt;p class=3D&quot;p1&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;&lt;b&gt;LSR Interim Agenda =
&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p2&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;Chairs: Acee Lindem&lt;/span&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p2&quot;&gt;&lt;span class=3D&quot;s1&quot;&gt;    =
        Chris Hopps&lt;/span&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p2&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;Secretary: Yingzhen Qu&lt;/span&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p2&quot;&gt;&lt;span class=3D&quot;s1&quot;&gt; =
&lt;/span&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p3&quot;&gt;&lt;span class=3D&quot;s2&quot;&gt;WG =
Status Web Page: &lt;a =
href=3D&quot;http://tools.ietf.org/wg/lsr/&quot;&gt;&lt;span =
class=3D&quot;s3&quot;&gt;http://tools.ietf.org/wg/lsr/&lt;/span&gt;&lt;/a=
&gt;&lt;/span&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p1&quot;&gt;&lt;span class=3D&quot;s1&quot;&gt; =
&lt;/span&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p1&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;Session #1&lt;/span&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p2&quot;&gt;&lt;span class=3D&quot;s1&quot;&gt;Date:=
 Thursday, 02 April 2020 &lt;/span&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p2&quot;&gt;&lt;span class=3D&quot;s1&quot;&gt;Start=
 Time: 09:00 America/New_York&lt;/span&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p2&quot;&gt;&lt;span class=3D&quot;s1&quot;&gt; =
&lt;/span&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p4&quot;&gt;&lt;span class=3D&quot;s1&quot;&gt;JOIN =
WEBEX MEETING&lt;/span&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p5&quot;&gt;&lt;span class=3D&quot;s4&quot;&gt;&lt;a=
 =
href=3D&quot;https://ietf.webex.com/ietf/j.php?MTID=3Dmbef20efa9e66c7e97f9=
d6b18ea84eca8&quot;&gt;https://ietf.webex.com/ietf/j.php?MTID=3Dmbef20efa9=
e66c7e97f9d6b18ea84eca8&lt;/a&gt;&lt;/span&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p4&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;Meeting number (access code): 617 996 =
556&lt;/span&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p4&quot;&gt;&lt;span class=3D&quot;s1&quot;&gt; =
&lt;/span&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p4&quot;&gt;&lt;span class=3D&quot;s1&quot;&gt;Host =
key: 199278&lt;/span&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p4&quot;&gt;&lt;span class=3D&quot;s1&quot;&gt; =
&lt;/span&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p4&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;Meeting password: =
linkstate&lt;/span&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p6&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;/p&gt;
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&lt;/span&gt;&lt;/p&gt;
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>        &lt;p class=3D&quot;p1&quot;&gt;&lt;span =
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>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td2&quot;&gt;
>        &lt;p class=3D&quot;p1&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;&lt;b&gt;Length&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;=

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>        &lt;p class=3D&quot;p1&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;&lt;b&gt;Topic/Draft&lt;/b&gt;&lt;/span&gt;&lt;/=
p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td4&quot;&gt;
>        &lt;p class=3D&quot;p1&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;&lt;b&gt;Who&lt;/b&gt;&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>    &lt;/tr&gt;
>    &lt;tr&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td1&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;9:00&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td2&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;5m&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td3&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;Administrivia&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td4&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;Acee/Chris&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>    &lt;/tr&gt;
>    &lt;tr&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td1&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;9:05 &lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td2&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;10m&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td3&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;IGP Flexible Algorithm&lt;/span&gt;&lt;/p&gt;
>        &lt;p class=3D&quot;p8&quot;&gt;&lt;span =
class=3D&quot;s4&quot;&gt;&lt;a =
href=3D&quot;https://datatracker.ietf.org/doc/draft-ietf-lsr-flex-algo/&qu=
ot;&gt;https://datatracker.ietf.org/doc/draft-ietf-lsr-flex-algo/&lt;span =
class=3D&quot;s5&quot;&gt;&lt;/span&gt;&lt;/a&gt;&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td4&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;Peter Psenak&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>    &lt;/tr&gt;
>    &lt;tr&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td1&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;9:15&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td2&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;15m&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td3&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;An Algorithm for Computing Dynamic Flooding =
Topologies&lt;/span&gt;&lt;/p&gt;
>        &lt;p class=3D&quot;p9&quot;&gt;&lt;span =
class=3D&quot;s4&quot;&gt;https://datatracker.ietf.org/doc/draft-chen-lsr-=
dynamic-flooding-algorithm/ &lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td4&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;Sarah Chen&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>    &lt;/tr&gt;
>    &lt;tr&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td1&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;9:30&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td2&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;15m&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td3&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;Hierarchical IS-IS&lt;/span&gt;&lt;/p&gt;
>        &lt;p class=3D&quot;p10&quot;&gt;&lt;span =
class=3D&quot;s4&quot;&gt;&lt;a =
href=3D&quot;https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-extended=
-hierarchy/&quot;&gt;https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-=
extended-hierarchy/&lt;/a&gt;&lt;/span&gt;&lt;span =
class=3D&quot;s1&quot;&gt; &lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td4&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;Tony Li&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>    &lt;/tr&gt;
>    &lt;tr&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td1&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;9:45&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td2&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;15m&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td3&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;Area Proxy&lt;/span&gt;&lt;/p&gt;
>        &lt;p class=3D&quot;p11&quot;&gt;&lt;span =
class=3D&quot;s4&quot;&gt;&lt;a =
href=3D&quot;https://datatracker.ietf.org/doc/draft-li-lsr-isis-area-proxy=
/&quot;&gt;https://datatracker.ietf.org/doc/draft-li-lsr-isis-area-proxy/&=
lt;/a&gt;&lt;/span&gt;&lt;span class=3D&quot;s1&quot;&gt;  =
&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td4&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;Tony Li&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>    &lt;/tr&gt;
>    &lt;tr&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td1&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;10:00&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td2&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;10m&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td3&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;Topology-Transparent =
Zone&lt;/span&gt;&lt;/p&gt;
>        &lt;p class=3D&quot;p10&quot;&gt;&lt;span =
class=3D&quot;s4&quot;&gt;&lt;a =
href=3D&quot;https://datatracker.ietf.org/doc/draft-chen-isis-ttz/&quot;&g=
t;https://datatracker.ietf.org/doc/draft-chen-isis-ttz/&lt;/a&gt;&lt;/span=
&gt;&lt;span class=3D&quot;s1&quot;&gt; &lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td4&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;Huaimo Chen&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>    &lt;/tr&gt;
>    &lt;tr&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td1&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;10:10&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td2&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;10m&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td3&quot;&gt;
>        &lt;p class=3D&quot;p12&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;IS-IS Flood Reflection&lt;/span&gt;&lt;/p&gt;
>        &lt;p class=3D&quot;p11&quot;&gt;&lt;span =
class=3D&quot;s4&quot;&gt;&lt;a =
href=3D&quot;https://datatracker.ietf.org/doc/draft-przygienda-lsr-flood-r=
eflection/&quot;&gt;https://datatracker.ietf.org/doc/draft-przygienda-lsr-=
flood-reflection/&lt;/a&gt;&lt;/span&gt;&lt;span =
class=3D&quot;s6&quot;&gt;&lt;span =
class=3D&quot;Apple-converted-space&quot;&gt; =
&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td4&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;Tony Przygienda&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>    &lt;/tr&gt;
>    &lt;tr&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td1&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;10:20 &lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td2&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;10m&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td3&quot;&gt;
>        &lt;p class=3D&quot;p12&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;IGP for Network High =
Availability&lt;/span&gt;&lt;/p&gt;
>        &lt;p class=3D&quot;p11&quot;&gt;&lt;span =
class=3D&quot;s4&quot;&gt;https://datatracker.ietf.org/doc/draft-chen-lsr-=
ctr-availability/&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td4&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;Huaimo Chen&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>    &lt;/tr&gt;
>    &lt;tr&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td1&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;10:30&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td2&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;10m&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td3&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;Passive Interface =
Attribute&lt;/span&gt;&lt;/p&gt;
>        &lt;p class=3D&quot;p13&quot;&gt;&lt;span =
class=3D&quot;s4&quot;&gt;&lt;a =
href=3D&quot;https://tools.ietf.org/html/draft-wang-lsr-passive-interface-=
attribute-00&quot;&gt;https://tools.ietf.org/html/draft-wang-lsr-passive-i=
nterface-attribute-00&lt;span =
class=3D&quot;s7&quot;&gt;&lt;/span&gt;&lt;/a&gt;&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td4&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;Huaimo Chen/Aijun Wang &lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>    &lt;/tr&gt;
>    &lt;tr&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td1&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;10:40&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td2&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;15m&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td3&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;IGP Extensions for Advertising IFIT Node =
Capability&lt;/span&gt;&lt;/p&gt;
>        &lt;p class=3D&quot;p10&quot;&gt;&lt;span =
class=3D&quot;s4&quot;&gt;&lt;a =
href=3D&quot;https://datatracker.ietf.org/doc/draft-liu-lsr-isis-ifit-node=
-capability/&quot;&gt;https://datatracker.ietf.org/doc/draft-liu-lsr-isis-=
ifit-node-capability/&lt;/a&gt;&lt;/span&gt;&lt;span =
class=3D&quot;s1&quot;&gt; &lt;/span&gt;&lt;/p&gt;
>        &lt;p class=3D&quot;p10&quot;&gt;&lt;span =
class=3D&quot;s4&quot;&gt;&lt;a =
href=3D&quot;https://datatracker.ietf.org/doc/draft-wang-lsr-ospf-ifit-nod=
e-capability/&quot;&gt;https://datatracker.ietf.org/doc/draft-wang-lsr-osp=
f-ifit-node-capability/&lt;/a&gt;&lt;/span&gt;&lt;span =
class=3D&quot;s1&quot;&gt; &lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td4&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;Yali Wang&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>    &lt;/tr&gt;
>    &lt;tr&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td1&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;10:55&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td2&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;20m &lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td3&quot;&gt;
>        &lt;p class=3D&quot;p14&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;IGP Extensions for Segment Routing based =
Enhanced VPN&lt;/span&gt;&lt;/p&gt;
>        &lt;p class=3D&quot;p8&quot;&gt;&lt;span =
class=3D&quot;s4&quot;&gt;&lt;a =
href=3D&quot;https://datatracker.ietf.org/doc/draft-dong-lsr-sr-enhanced-v=
pn/&quot;&gt;https://datatracker.ietf.org/doc/draft-dong-lsr-sr-enhanced-v=
pn/&lt;/a&gt;&lt;/span&gt;&lt;span class=3D&quot;s8&quot;&gt; =
&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td4&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;Jie Dong&lt;/span&gt;&lt;/p&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt; &lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>    &lt;/tr&gt;
>    &lt;tr&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td1&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt; &lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td2&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt; &lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td3&quot;&gt;
>        &lt;p class=3D&quot;p14&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt; &lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td4&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt; &lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>    &lt;/tr&gt;
>  &lt;/tbody&gt;
> &lt;/table&gt;
> &lt;p class=3D&quot;p15&quot;&gt;&lt;span class=3D&quot;s1&quot;&gt; =
&lt;/span&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p15&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;Session #2&lt;/span&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p2&quot;&gt;&lt;span class=3D&quot;s1&quot;&gt;Date:=
 Wednesday, 29 April 2020 &lt;/span&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p2&quot;&gt;&lt;span class=3D&quot;s1&quot;&gt;Start=
 Time: 10:00 America/New_York&lt;/span&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p16&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p4&quot;&gt;&lt;span class=3D&quot;s1&quot;&gt;JOIN =
WEBEX MEETING&lt;/span&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p5&quot;&gt;&lt;span class=3D&quot;s4&quot;&gt;&lt;a=
 =
href=3D&quot;https://ietf.webex.com/ietf/j.php?MTID=3Dm2c9ca5147e9fc849121=
cf804641ad1b5&quot;&gt;https://ietf.webex.com/ietf/j.php?MTID=3Dm2c9ca5147=
e9fc849121cf804641ad1b5&lt;/a&gt;&lt;/span&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p4&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;Meeting number (access code): 616 091 =
577&lt;/span&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p4&quot;&gt;&lt;span class=3D&quot;s1&quot;&gt; =
&lt;/span&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p4&quot;&gt;&lt;span class=3D&quot;s1&quot;&gt;Host =
key: 115251&lt;/span&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p4&quot;&gt;&lt;span class=3D&quot;s1&quot;&gt; =
&lt;/span&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p4&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;Meeting password: =
linkstate&lt;/span&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p16&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;&lt;/span&gt;&lt;br&gt;&lt;/p&gt;
> &lt;p class=3D&quot;p15&quot;&gt;&lt;span class=3D&quot;s1&quot;&gt; =
&lt;/span&gt;&lt;/p&gt;
> &lt;table cellspacing=3D&quot;0&quot; cellpadding=3D&quot;0&quot;&gt;
>  &lt;tbody&gt;
>    &lt;tr&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td1&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;10:00&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td2&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;5m&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td3&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;Administrivia&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td4&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;Acee/Chris&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>    &lt;/tr&gt;
>    &lt;tr&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td1&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;10:05&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td2&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;15m&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td3&quot;&gt;
>        &lt;p class=3D&quot;p14&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;IS-IS Flooding Parameters =
Advertisement&lt;span class=3D&quot;Apple-converted-space&quot;&gt; =
&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;
>        &lt;p class=3D&quot;p11&quot;&gt;&lt;span =
class=3D&quot;s4&quot;&gt;&lt;a =
href=3D&quot;https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-floo=
ding-speed/&quot;&gt;https://datatracker.ietf.org/doc/draft-decraene-lsr-i=
sis-flooding-speed/&lt;span =
class=3D&quot;s7&quot;&gt;&lt;/span&gt;&lt;/a&gt;&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td4&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;Bruno Decraene&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>    &lt;/tr&gt;
>    &lt;tr&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td1&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;10:20&lt;span =
class=3D&quot;Apple-converted-space&quot;&gt; =
&lt;/span&gt;&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td2&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;10m&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td3&quot;&gt;
>        &lt;p class=3D&quot;p14&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;IS-IS Flooding Scale =
Considerations&lt;/span&gt;&lt;/p&gt;
>        &lt;p class=3D&quot;p11&quot;&gt;&lt;span =
class=3D&quot;s4&quot;&gt;&lt;a =
href=3D&quot;https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-floo=
ding-scale/&quot;&gt;https://datatracker.ietf.org/doc/draft-ginsberg-lsr-i=
sis-flooding-scale/&lt;span =
class=3D&quot;s7&quot;&gt;&lt;/span&gt;&lt;/a&gt;&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td4&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;Les Ginsberg&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>    &lt;/tr&gt;
>    &lt;tr&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td1&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;10:30&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td2&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt;open&lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td3&quot;&gt;
>        &lt;p class=3D&quot;p12&quot;&gt;&lt;span =
class=3D&quot;s4&quot;&gt;Flooding Parameters/Scale =
discussion&lt;/span&gt;&lt;/p&gt;
>        &lt;p class=3D&quot;p12&quot;&gt;&lt;span =
class=3D&quot;s4&quot;&gt; &lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>      &lt;td valign=3D&quot;top&quot; class=3D&quot;td4&quot;&gt;
>        &lt;p class=3D&quot;p7&quot;&gt;&lt;span =
class=3D&quot;s1&quot;&gt; &lt;/span&gt;&lt;/p&gt;
>      &lt;/td&gt;
>    &lt;/tr&gt;
>  &lt;/tbody&gt;
> &lt;/table&gt;
> &lt;p class=3D&quot;p15&quot;&gt;&lt;span class=3D&quot;s1&quot;&gt; =
&lt;/span&gt;&lt;/p&gt;
> &lt;/body&gt;
> &lt;/html&gt;
>=20
> Information about remote participation:
> URL: =
https://ietf.webex.com/ietf/j.php?MTID=3Dm2c9ca5147e9fc849121cf804641ad1b5=

>=20
> =
https://datatracker.ietf.org/meeting/interim-2020-lsr-02/materials/agenda-=
interim-2020-lsr-02-lsr-01.html
>=20
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr


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Subject: Re: [Lsr] On collaboration for abstraction
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Hi Alvaro,


> Having official and open meetings is the way to go.


I concur.


> An alternative would be for the group to work as a Design Team: the =
discussions can happen in the lsr list, periodic open calls can be =
scheduled...without some of the administrative overhead.  The DT could =
include others (non-authors) for moderation and coordination, and =
anyone/everyone would be able to participate.


I have some concerns about how this would be perceived. A Design Team is =
traditionally a small subset of the WG, with intentionally bounded =
membership. Describing this as a Design Team would seem to give the =
wrong impression and I would feel uncomfortable participating in this =
without lawyers present.

Tony



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Hi Peter,


> it may be worth to make your algorithm one of the standardized =
distributed algorithms. There might be some work to make it =
deterministic, like the selection rules mentioned below, but it should =
be doable.
>=20
> What do you think?


I will certainly stipulate the possibility.

However, as I=E2=80=99ve said from the start, I have some grave concerns =
about debugging this and making it inter-operable. Every node choice, =
every edge selection, from the selection of the initial node, through =
DFS, through BFS, needs to be identical. The weighting between degree =
and diameter needs to deterministic and fixed.

We would have to have extensive deployment experience before I would =
feel comfortable pouring concrete on this.

So, if someone would like to make a distributed version, we will support =
it.  But we aren=E2=80=99t in a place where we=E2=80=99re ready to drive =
that effort. Please feel free.

Tony


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Cc: Robert Raszuk <robert@raszuk.net>, Christian Hopps <chopps@chopps.org>, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, lsr@ietf.org, Tianran Zhou <zhoutianran@huawei.com>, "Acee Lindem (acee)" <acee@cisco.com>, wangyali <wangyali11@huawei.com>
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To: Lou Berger <lberger@labn.net>
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Subject: Re: [Lsr] problem joining interim [Re: A new version of I-D, draft-liu-lsr-isis-ifit-node-capability-02]
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Same here

Regards,
Jeff

> On Apr 3, 2020, at 03:38, Lou Berger <lberger@labn.net> wrote:
>=20
> =EF=BB=BF
> Fwiw I used the link in the agenda without issue.  I did the same for RAW l=
ast week.  Also, as host of a different wg interim right before lsr, I didn'=
t have to do anything to let people in to the session - they just showed up.=
...
>=20
> Lou
>=20
>> On April 2, 2020 6:10:43 PM Robert Raszuk <robert@raszuk.net> wrote:
>>=20
>> Hi Chris,
>>=20
>> I never noticed the password ....=20
>>=20
>> Just few days back I participated in IDR and no password was needed or pe=
rhaps webex invite link contained a token relaxing from needing one.=20
>>=20
>> Cheers,
>> R..
>>=20
>>> On Fri, Apr 3, 2020 at 12:00 AM Christian Hopps <chopps@chopps.org> wrot=
e:
>>>=20
>>>=20
>>> > On Apr 2, 2020, at 5:17 PM, Robert Raszuk <robert@raszuk.net> wrote:
>>> >=20
>>> > Many thx,
>>> > R.
>>> >=20
>>> > PS. As we are talking LSR here it is strange that joining virtual LSR m=
eeting is not for everyone. I was waiting and tried three times today for ho=
st approval to join which was not granted.=20
>>> >=20
>>>=20
>>> I am very sorry to hear this! We had 64 participants, at least at one po=
int that I saw. I set the meeting up, and I don't believe there is any way t=
o exclude anyone in particular, I certainly would never have chosen to do th=
at.
>>>=20
>>> However, Webex has a password requirement when setting up meetings (I gu=
ess, I tried to not have one, it wouldn't let me) which we included in all t=
he details wherever the details were posted, it was "linkstate"..
>>>=20
>>> I did notice an email, from webex, during the meeting about a request fr=
om Bruno to join as guest, but he was in the participant list when I then ch=
ecked. I didn't receive any other emails like that (and FWIW I had 5 windows=
 over 2 monitors going at once trying to manage all this, so noticing the 1 e=
mail was lucky).
>>>=20
>>> Did it let you skip entering a password (or did it not offer the option i=
n the first place)?
>>>=20
>>> It would be good to figure this out before the next interim.
>>>=20
>>> Thanks,
>>> Chris.
>>>=20
>>> _______________________________________________
>>> Lsr mailing list
>>> Lsr@ietf.org
>>> https://www.ietf.org/mailman/listinfo/lsr
>>=20
>> _______________________________________________
>> Lsr mailing list
>> Lsr@ietf.org
>> https://www.ietf.org/mailman/listinfo/lsr
>>=20

--Apple-Mail-9BF4A325-7763-48D0-8CA0-868621291C5A
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Content-Transfer-Encoding: quoted-printable

<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Same here<br><br><div dir=3D"ltr">Regards,<=
div>Jeff</div></div><div dir=3D"ltr"><br><blockquote type=3D"cite">On Apr 3,=
 2020, at 03:38, Lou Berger &lt;lberger@labn.net&gt; wrote:<br><br></blockqu=
ote></div><blockquote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF

<div style=3D"color: black;">
<div style=3D"color: black;">
<p style=3D"margin: 0 0 1em 0; color: black;">Fwiw I used the link in the ag=
enda without issue.&nbsp; I did the same for RAW last week.&nbsp; Also, as h=
ost of a different wg interim right before lsr, I didn't have to do anything=
 to let people in to the session - they just showed up....</p>
<p style=3D"margin: 0 0 1em 0; color: black;">Lou</p>
</div>
<div style=3D"color: black;">
<hr style=3D"border: none; border-top: solid #D0D0D0 1.0pt;">
<p style=3D"color: black; font-size: 10pt; font-family: sans-serif; margin: 8=
pt 0;">On April 2, 2020 6:10:43 PM Robert Raszuk &lt;robert@raszuk.net&gt; w=
rote:</p>
<blockquote type=3D"cite" class=3D"gmail_quote" style=3D"margin: 0 0 0 0.75e=
x; border-left: 1px solid #808080; padding-left: 0.75ex;">
<div dir=3D"ltr">Hi Chris,<div><br></div><div>I never noticed the password .=
...&nbsp;</div><div><br></div><div>Just few days back I participated in IDR a=
nd no password&nbsp;was needed or perhaps webex invite link contained a toke=
n relaxing from needing one.&nbsp;</div><div><br></div><div>Cheers,<br>R..</=
div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_att=
r">On Fri, Apr 3, 2020 at 12:00 AM Christian Hopps &lt;<a href=3D"mailto:cho=
pps@chopps.org">chopps@chopps.org</a>&gt; wrote:<br></div><blockquote class=3D=
"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(20=
4,204,204);padding-left:1ex"><br>
<br>
&gt; On Apr 2, 2020, at 5:17 PM, Robert Raszuk &lt;<a href=3D"mailto:robert@=
raszuk.net" target=3D"_blank">robert@raszuk.net</a>&gt; wrote:<br>
&gt; <br>
&gt; Many thx,<br>
&gt; R.<br>
&gt; <br>
&gt; PS. As we are talking LSR here it is strange that joining virtual LSR m=
eeting is not for everyone. I was waiting and tried three times today for ho=
st approval to join which was not granted. <br>
&gt; <br>
<br>
I am very sorry to hear this! We had 64 participants, at least at one point t=
hat I saw. I set the meeting up, and I don't believe there is any way to exc=
lude anyone in particular, I certainly would never have chosen to do that.<b=
r>
<br>
However, Webex has a password requirement when setting up meetings (I guess,=
 I tried to not have one, it wouldn't let me) which we included in all the d=
etails wherever the details were posted, it was "linkstate"..<br>
<br>
I did notice an email, from webex, during the meeting about a request from B=
runo to join as guest, but he was in the participant list when I then checke=
d. I didn't receive any other emails like that (and FWIW I had 5 windows ove=
r 2 monitors going at once trying to manage all this, so noticing the 1 emai=
l was lucky).<br>
<br>
Did it let you skip entering a password (or did it not offer the option in t=
he first place)?<br>
<br>
It would be good to figure this out before the next interim.<br>
<br>
Thanks,<br>
Chris.<br>
<br>
_______________________________________________<br>
Lsr mailing list<br>
<a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferrer" tar=
get=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
</blockquote></div>

<div>_______________________________________________</div>
<div>Lsr mailing list</div>
<div><a class=3D"aqm-autolink aqm-autowrap" href=3D"mailto:Lsr%40ietf.org">L=
sr@ietf.org</a></div>
<div><a class=3D"aqm-autolink aqm-autowrap" href=3D"https://www.ietf.org/mai=
lman/listinfo/lsr">https://www.ietf.org/mailman/listinfo/lsr</a></div>
<div><br></div>
</blockquote>
</div>
</div>


</div></blockquote></body></html>=

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References: <1520992FC97B944A9979C2FC1D7DB0F404DB1AD4@dggeml524-mbx.china.huawei.com> <MW3PR11MB4619361A2CA3A402A44914E5C1FE0@MW3PR11MB4619.namprd11.prod.outlook.com> <1520992FC97B944A9979C2FC1D7DB0F404DB2336@dggeml524-mbx.china.huawei.com> <68249E56-5702-4C15-9748-439E43F3EB0E@chopps.org> <1520992FC97B944A9979C2FC1D7DB0F404DEFC14@dggeml524-mbx.china.huawei.com> <A937FECB-2013-403E-89B2-47971514F6CF@chopps.org> <80a8f83c76d447dda48280495b3a80a7@huawei.com> <6F0E8437-5D82-4FAC-A061-69E56E1E161D@chopps.org> <2189e17f36764960bf2dcc554cde9ce0@huawei.com> <MW3PR11MB4619925BEF83B0C4512DD284C1C90@MW3PR11MB4619.namprd11.prod.outlook.com> <06e8443210924ac788c40fa15972cbdd@huawei.com> <C987B657-64D1-4C70-B471-ED9F1266B990@cisco.com> <3948044C-0CC9-4AE8-8541-4D23A5DF396E@cisco.com> <1520992FC97B944A9979C2FC1D7DB0F404DF089E@dggeml524-mbx.china.huawei.com> <CA+RyBmVM5WdxtmRU-t2LVdcX+3bX00EHg4LsDZCFbucorSkGDA@mail.gmail.com> <455ac7998a2a45dd873833450e14ca61@huawei.com>
In-Reply-To: <455ac7998a2a45dd873833450e14ca61@huawei.com>
From: Greg Mirsky <gregimirsky@gmail.com>
Date: Fri, 3 Apr 2020 15:12:32 -0700
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To: Tianran Zhou <zhoutianran@huawei.com>
Cc: wangyali <wangyali11@huawei.com>, "Acee Lindem (acee)" <acee@cisco.com>,  "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, Christian Hopps <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>
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Hi Tianran,
thank you for your kind attention to my questions. Please find my notes
in-lined below under the GIM>> tag.

Kind regards,
Greg

On Thu, Apr 2, 2020 at 11:33 PM Tianran Zhou <zhoutianran@huawei.com> wrote=
:

> Hi Greg,
>
>
>
> Good questions. Please see my reply in line.
>
>
>
> Thanks,
>
> Tianran
>
>
>
> *From:* Greg Mirsky [mailto:gregimirsky@gmail.com]
> *Sent:* Friday, April 3, 2020 6:58 AM
> *To:* wangyali <wangyali11@huawei.com>
> *Cc:* Acee Lindem (acee) <acee@cisco.com>; Les Ginsberg (ginsberg) <
> ginsberg@cisco.com>; Christian Hopps <chopps@chopps.org>; lsr@ietf.org;
> Tianran Zhou <zhoutianran@huawei.com>
> *Subject:* Re: [Lsr] =E7=AD=94=E5=A4=8D: A new version of I-D,
> draft-liu-lsr-isis-ifit-node-capability-02
>
>
>
> Hi Yali, et al,
>
> thank you for the interesting discussion. I have several questions about
> the purpose of advertising ifit capabilities in IGP (and in general):
>
>    - Do you see a capability to export telemetry information as a
>    mandatory or optional?
>
> What=E2=80=99s the context with this question? Frankly, I did not have a =
deep well
> thinking on this question. But in our case, I wish it=E2=80=99s mandatory=
.
>
GIM>> If it is mandatory, then all nodes in a domain support IFIT and,
consequently, there's no need to advertise the capability in the
homogeneous, IFIT-wise, domain. Would you agree?

>
>    - Do you expect that a segment route to be constructed to prefer
>    ifit-capable nodes comparing to nodes that are not?
>
> Yes. This is one use case. As my echo to Robert, we want to achieve the
> SLA assurance network. We think the capability for visibility to verify t=
he
> SLA compliance, and also the capability to get the accurate measurement f=
or
> path computation should be considered. Should be considered from the very
> beginning when we compute the path.
>
GIM>> I understand that IFIT-capability might be used as one of CSPF
constraints. But, as I think of it, it can simply be discovered in the
course of running on-path telemetry collection. Would you agree?

> Thank you for your kind consideration of my questions.
>
>
>
> Regards,
>
> Greg
>
>
>
> On Wed, Apr 1, 2020 at 8:13 PM wangyali <wangyali11@huawei.com> wrote:
>
> Hi Acee, Chris and Les,
>
> This is Yali. Many thanks for your kind comments and suggestion.
>
> Besides of signaling MSD by IGP node CAPABILITY TLV, we learned that
> there's another RFC7883 that advertising S-BFD discriminators in IS-IS. I=
n
> my understand, BFD is a protocol to detect faults in the bidirectional pa=
th
> between two forwarding engines, including interface, data links, etc.
>
> Similarly, IFIT provides a complete framework of a family of on-path
> telemetry techniques, which are used to monitoring performance metrics of
> service flows, e.g. packet loss, delay. So we consider there's a same
> methodology with S-BFD that advertising IFIT node capabilities.
>
> Please let us know your comments and opinion. Thanks.
>
> Best regards,
> Yali
>
> -----=E9=82=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6-----
> =E5=8F=91=E4=BB=B6=E4=BA=BA: Acee Lindem (acee) [mailto:acee@cisco.com]
> =E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B44=E6=9C=881=E6=97=A5 2=
0:29
> =E6=94=B6=E4=BB=B6=E4=BA=BA: Tianran Zhou <zhoutianran@huawei.com>; Les G=
insberg (ginsberg) <
> ginsberg@cisco.com>; Christian Hopps <chopps@chopps.org>
> =E6=8A=84=E9=80=81: lsr@ietf.org; wangyali <wangyali11@huawei.com>
> =E4=B8=BB=E9=A2=98: Re: [Lsr] A new version of I-D,
> draft-liu-lsr-isis-ifit-node-capability-02
>
> Speak as WG Member...
>
> =EF=BB=BFOn 4/1/20, 8:08 AM, "Acee Lindem (acee)" <acee@cisco.com> wrote:
>
>     There is also a difference between some of the existing applications
> advertised in IGP capabilities. For example, MSD is used with the routing
> information to construct SR paths. The information for all these OAM
> mechanisms doesn't share this affinity. Also, it seems like a slippery
> slope in what is needed for each of the mechanism.
>     Thanks,
>     Acee
>
>     On 4/1/20, 4:01 AM, "Lsr on behalf of Tianran Zhou" <
> lsr-bounces@ietf.org on behalf of zhoutianran@huawei.com> wrote:
>
>         Hi Les,
>
>         Thanks very much for your suggestion. I have a quick look at
> rfc6823. Sounds like a good idea. I will think about it.
>
>         Cheers,
>         Tianran
>
>         -----Original Message-----
>         From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]
>         Sent: Wednesday, April 1, 2020 1:47 PM
>         To: Tianran Zhou <zhoutianran@huawei.com>; Christian Hopps <
> chopps@chopps.org>
>         Cc: wangyali <wangyali11@huawei.com>; lsr@ietf.org
>         Subject: RE: [Lsr] A new version of I-D,
> draft-liu-lsr-isis-ifit-node-capability-02
>
>         Tianran -
>
>         I am very much in agreement with the points Chris has made.
>
>         IGPs do not exist to advertise capabilities/configure application=
s
> - which seems to me to be what you are proposing here.
>         The fact that you can easily define the encodings does not make i=
t
> the right thing to do.
>
>         This issue was discussed at length in the context of
> https://tools.ietf.org/html/rfc6823 . If you were proposing to use GENAPP
> I would not object - though I do think Chris has correctly pointed out th=
at
> NETCONF/YANG is likely a more appropriate solution for your use case.
>
>            Les
>
>
>         > -----Original Message-----
>         > From: Tianran Zhou <zhoutianran@huawei.com>
>         > Sent: Tuesday, March 31, 2020 7:53 PM
>         > To: Christian Hopps <chopps@chopps.org>
>         > Cc: wangyali <wangyali11@huawei.com>; Les Ginsberg (ginsberg)
>         > <ginsberg@cisco.com>; lsr@ietf.org
>         > Subject: RE: [Lsr] A new version of I-D,
>         > draft-liu-lsr-isis-ifit-node-capability-02
>         >
>         > Hi Chris,
>         > Thanks for your quick reply, and please see inline.
>         >
>         > Cheers,
>         > Tianran
>         >
>         > -----Original Message-----
>         > From: Christian Hopps [mailto:chopps@chopps.org]
>         > Sent: Wednesday, April 1, 2020 10:00 AM
>         > To: Tianran Zhou <zhoutianran@huawei.com>
>         > Cc: Christian Hopps <chopps@chopps.org>; wangyali
>         > <wangyali11@huawei.com>; Les Ginsberg (ginsberg) <
> ginsberg@cisco.com>;
>         > lsr@ietf.org
>         > Subject: Re: [Lsr] A new version of I-D,
>         > draft-liu-lsr-isis-ifit-node-capability-02
>         >
>         >
>         >
>         > > On Mar 31, 2020, at 9:28 PM, Tianran Zhou <
> zhoutianran@huawei.com>
>         > wrote:
>         > >
>         > > ZTR> Let's not boil the ocean to compare NETCONF/YANG or
> routing
>         > protocol, which is better. But I did not see the modification t=
o
>         > routing protocol with some TLVs is a heavy work, or more comple=
x
> than
>         > NETCONF/YANG.  I see both are available and useful.
>         >
>         > I'm not sure what you mean by boiling the ocean. I'm saying tha=
t
> YANG
>         > is built and intended for querying capabilities and configuring
>         > routers. Why isn't that where you are looking first for
> configuring your monitoring application?
>         >
>         > ZTR> I know NETCONF can do both query and configuration. And I
> know
>         > resent YANG-Push improvements to reduce the polling.  But
> routing
>         > protocol solutions are also widely used for this. There are
> already
>         > many RFCs and implementation practices. We considered both ways=
,
> and
>         > aimed for different scenarios.
>         >
>         > You don't see the major difference between writing a YANG model
> vs
>         > modifying all of the standard IETF routing protocols?
>         >
>         > ZTR> I know many differences between NETCONF and routing
> protocol.
>         > There are many details on both interfaces, implementations,
> scenarios
>         > when comparing them. That's what I mean boil the ocean.
>         > Here I do not know what's the "major difference" you mean?
>         >
>         > Thanks,
>         > Chris.
>
>         _______________________________________________
>         Lsr mailing list
>         Lsr@ietf.org
>         https://www.ietf.org/mailman/listinfo/lsr
>
>
>
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>
>

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<div dir=3D"ltr"><div dir=3D"ltr">Hi Tianran,<div>thank you for your kind a=
ttention to my questions. Please find my notes in-lined below under the GIM=
&gt;&gt; tag.</div><div><br></div><div>Kind regards,</div><div>Greg</div></=
div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On=
 Thu, Apr 2, 2020 at 11:33 PM Tianran Zhou &lt;<a href=3D"mailto:zhoutianra=
n@huawei.com">zhoutianran@huawei.com</a>&gt; wrote:<br></div><blockquote cl=
ass=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid=
 rgb(204,204,204);padding-left:1ex">





<div lang=3D"EN-US">
<div class=3D"gmail-m_5523028394737835482WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif;color:rgb(31,73,125)">Hi Greg,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif;color:rgb(31,73,125)">Good questions. Please see my reply in line.=
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif;color:rgb(31,73,125)">Thanks,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif;color:rgb(31,73,125)">Tianran<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:11pt;font-family:Calibri=
,sans-serif">From:</span></b><span style=3D"font-size:11pt;font-family:Cali=
bri,sans-serif"> Greg Mirsky [mailto:<a href=3D"mailto:gregimirsky@gmail.co=
m" target=3D"_blank">gregimirsky@gmail.com</a>]
<br>
<b>Sent:</b> Friday, April 3, 2020 6:58 AM<br>
<b>To:</b> wangyali &lt;<a href=3D"mailto:wangyali11@huawei.com" target=3D"=
_blank">wangyali11@huawei.com</a>&gt;<br>
<b>Cc:</b> Acee Lindem (acee) &lt;<a href=3D"mailto:acee@cisco.com" target=
=3D"_blank">acee@cisco.com</a>&gt;; Les Ginsberg (ginsberg) &lt;<a href=3D"=
mailto:ginsberg@cisco.com" target=3D"_blank">ginsberg@cisco.com</a>&gt;; Ch=
ristian Hopps &lt;<a href=3D"mailto:chopps@chopps.org" target=3D"_blank">ch=
opps@chopps.org</a>&gt;; <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">=
lsr@ietf.org</a>; Tianran Zhou &lt;<a href=3D"mailto:zhoutianran@huawei.com=
" target=3D"_blank">zhoutianran@huawei.com</a>&gt;<br>
<b>Subject:</b> Re: [Lsr] </span><span lang=3D"ZH-CN" style=3D"font-size:11=
pt;font-family:=E5=AE=8B=E4=BD=93">=E7=AD=94=E5=A4=8D</span><span style=3D"=
font-size:11pt;font-family:Calibri,sans-serif">: A new version of I-D, draf=
t-liu-lsr-isis-ifit-node-capability-02<u></u><u></u></span></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">Hi Yali, et al,<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">thank you for the interesting discussion. I have sev=
eral questions about the purpose of advertising ifit capabilities in IGP (a=
nd in general):<u></u><u></u></p>
</div>
<div>
<ul type=3D"disc">
<li class=3D"MsoNormal">
Do you see a capability to export telemetry information as a mandatory=C2=
=A0or optional?<u></u><u></u></li></ul>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif;color:rgb(31,73,125)">What=E2=80=99s the context with this questio=
n? Frankly, I did not have a deep well thinking on this question.
 But in our case, I wish it=E2=80=99s mandatory.</span></p></div></div></di=
v></div></blockquote><div>GIM&gt;&gt; If it is mandatory, then all nodes in=
 a domain support IFIT and, consequently, there&#39;s no need to advertise =
the capability in the homogeneous, IFIT-wise, domain. Would you agree?=C2=
=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8e=
x;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang=3D"EN-=
US"><div class=3D"gmail-m_5523028394737835482WordSection1"><div><div><p cla=
ss=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sans-ser=
if;color:rgb(31,73,125)"><u></u><u></u></span></p>
<ul type=3D"disc">
<li class=3D"MsoNormal">
Do you expect that a segment route to be constructed to prefer ifit-capable=
 nodes comparing to nodes that are not?<u></u><u></u></li></ul>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif;color:rgb(31,73,125)">Yes. This is one use case. As my echo to Rob=
ert, we want to achieve the SLA assurance network. We think
 the capability for visibility to verify the SLA compliance, and also the c=
apability to get the accurate measurement for path computation should be co=
nsidered. Should be considered from the very beginning when we compute the =
path.</span></p></div></div></div></div></blockquote><div>GIM&gt;&gt; I und=
erstand that IFIT-capability might be used as one of CSPF constraints. But,=
 as I think of it, it can simply be discovered in the course of running on-=
path telemetry collection. Would you agree?</div><blockquote class=3D"gmail=
_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204=
,204);padding-left:1ex"><div lang=3D"EN-US"><div class=3D"gmail-m_552302839=
4737835482WordSection1"><div><div><p class=3D"MsoNormal"><span style=3D"fon=
t-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u><u>=
</u></span></p>
<div>
<p class=3D"MsoNormal">Thank you for your kind consideration of my question=
s.<u></u><u></u></p>
</div>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Regards,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Greg<u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal">On Wed, Apr 1, 2020 at 8:13 PM wangyali &lt;<a href=
=3D"mailto:wangyali11@huawei.com" target=3D"_blank">wangyali11@huawei.com</=
a>&gt; wrote:<u></u><u></u></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin-left:4=
.8pt;margin-right:0cm">
<p class=3D"MsoNormal">Hi Acee, Chris and Les,<br>
<br>
This is Yali. Many thanks for your kind comments and suggestion. <br>
<br>
Besides of signaling MSD by IGP node CAPABILITY TLV, we learned that there&=
#39;s another RFC7883 that advertising S-BFD discriminators in IS-IS. In my=
 understand, BFD is a protocol to detect faults in the bidirectional path b=
etween two forwarding engines, including
 interface, data links, etc.<br>
<br>
Similarly, IFIT provides a complete framework of a family of on-path teleme=
try techniques, which are used to monitoring performance metrics of service=
 flows, e.g. packet loss, delay. So we consider there&#39;s a same methodol=
ogy with S-BFD that advertising IFIT
 node capabilities.<br>
<br>
Please let us know your comments and opinion. Thanks.<br>
<br>
Best regards,<br>
Yali<br>
<br>
-----<span lang=3D"ZH-CN" style=3D"font-family:=E5=AE=8B=E4=BD=93">=E9=82=
=AE=E4=BB=B6=E5=8E=9F=E4=BB=B6</span>-----<br>
<span lang=3D"ZH-CN" style=3D"font-family:=E5=AE=8B=E4=BD=93">=E5=8F=91=E4=
=BB=B6=E4=BA=BA</span>: Acee Lindem (acee) [mailto:<a href=3D"mailto:acee@c=
isco.com" target=3D"_blank">acee@cisco.com</a>]
<br>
<span lang=3D"ZH-CN" style=3D"font-family:=E5=AE=8B=E4=BD=93">=E5=8F=91=E9=
=80=81=E6=97=B6=E9=97=B4</span>: 2020<span lang=3D"ZH-CN" style=3D"font-fam=
ily:=E5=AE=8B=E4=BD=93">=E5=B9=B4</span>4<span lang=3D"ZH-CN" style=3D"font=
-family:=E5=AE=8B=E4=BD=93">=E6=9C=88</span>1<span lang=3D"ZH-CN" style=3D"=
font-family:=E5=AE=8B=E4=BD=93">=E6=97=A5</span> 20:29<br>
<span lang=3D"ZH-CN" style=3D"font-family:=E5=AE=8B=E4=BD=93">=E6=94=B6=E4=
=BB=B6=E4=BA=BA</span>: Tianran Zhou &lt;<a href=3D"mailto:zhoutianran@huaw=
ei.com" target=3D"_blank">zhoutianran@huawei.com</a>&gt;; Les Ginsberg (gin=
sberg) &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">ginsberg=
@cisco.com</a>&gt;; Christian
 Hopps &lt;<a href=3D"mailto:chopps@chopps.org" target=3D"_blank">chopps@ch=
opps.org</a>&gt;<br>
<span lang=3D"ZH-CN" style=3D"font-family:=E5=AE=8B=E4=BD=93">=E6=8A=84=E9=
=80=81</span>: <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">
lsr@ietf.org</a>; wangyali &lt;<a href=3D"mailto:wangyali11@huawei.com" tar=
get=3D"_blank">wangyali11@huawei.com</a>&gt;<br>
<span lang=3D"ZH-CN" style=3D"font-family:=E5=AE=8B=E4=BD=93">=E4=B8=BB=E9=
=A2=98</span>: Re: [Lsr] A new version of I-D, draft-liu-lsr-isis-ifit-node=
-capability-02<br>
<br>
Speak as WG Member... <br>
<br>
<span style=3D"font-family:Tahoma,sans-serif">=EF=BB=BF</span>On 4/1/20, 8:=
08 AM, &quot;Acee Lindem (acee)&quot; &lt;<a href=3D"mailto:acee@cisco.com"=
 target=3D"_blank">acee@cisco.com</a>&gt; wrote:<br>
<br>
=C2=A0 =C2=A0 There is also a difference between some of the existing appli=
cations advertised in IGP capabilities. For example, MSD is used with the r=
outing information to construct SR paths. The information for all these OAM=
 mechanisms doesn&#39;t share this affinity. Also,
 it seems like a slippery slope in what is needed for each of the mechanism=
. <br>
=C2=A0 =C2=A0 Thanks,<br>
=C2=A0 =C2=A0 Acee<br>
<br>
=C2=A0 =C2=A0 On 4/1/20, 4:01 AM, &quot;Lsr on behalf of Tianran Zhou&quot;=
 &lt;<a href=3D"mailto:lsr-bounces@ietf.org" target=3D"_blank">lsr-bounces@=
ietf.org</a> on behalf of
<a href=3D"mailto:zhoutianran@huawei.com" target=3D"_blank">zhoutianran@hua=
wei.com</a>&gt; wrote:<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Hi Les,<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Thanks very much for your suggestion. I have a =
quick look at rfc6823. Sounds like a good idea. I will think about it.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Cheers,<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Tianran<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 -----Original Message-----<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 From: Les Ginsberg (ginsberg) [mailto:<a href=
=3D"mailto:ginsberg@cisco.com" target=3D"_blank">ginsberg@cisco.com</a>]
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Sent: Wednesday, April 1, 2020 1:47 PM<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 To: Tianran Zhou &lt;<a href=3D"mailto:zhoutian=
ran@huawei.com" target=3D"_blank">zhoutianran@huawei.com</a>&gt;; Christian=
 Hopps &lt;<a href=3D"mailto:chopps@chopps.org" target=3D"_blank">chopps@ch=
opps.org</a>&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Cc: wangyali &lt;<a href=3D"mailto:wangyali11@h=
uawei.com" target=3D"_blank">wangyali11@huawei.com</a>&gt;;
<a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</a><br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Subject: RE: [Lsr] A new version of I-D, draft-=
liu-lsr-isis-ifit-node-capability-02<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Tianran -<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 I am very much in agreement with the points Chr=
is has made.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 IGPs do not exist to advertise capabilities/con=
figure applications - which seems to me to be what you are proposing here.<=
br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 The fact that you can easily define the encodin=
gs does not make it the right thing to do.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 This issue was discussed at length in the conte=
xt of <a href=3D"https://tools.ietf.org/html/rfc6823" target=3D"_blank">
https://tools.ietf.org/html/rfc6823</a> . If you were proposing to use GENA=
PP I would not object - though I do think Chris has correctly pointed out t=
hat NETCONF/YANG is likely a more appropriate solution for your use case.<b=
r>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0Les<br>
<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; -----Original Message-----<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; From: Tianran Zhou &lt;<a href=3D"mailto:z=
houtianran@huawei.com" target=3D"_blank">zhoutianran@huawei.com</a>&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; Sent: Tuesday, March 31, 2020 7:53 PM<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; To: Christian Hopps &lt;<a href=3D"mailto:=
chopps@chopps.org" target=3D"_blank">chopps@chopps.org</a>&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; Cc: wangyali &lt;<a href=3D"mailto:wangyal=
i11@huawei.com" target=3D"_blank">wangyali11@huawei.com</a>&gt;; Les Ginsbe=
rg (ginsberg)
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; &lt;<a href=3D"mailto:ginsberg@cisco.com" =
target=3D"_blank">ginsberg@cisco.com</a>&gt;;
<a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</a><br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; Subject: RE: [Lsr] A new version of I-D, <=
br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; draft-liu-lsr-isis-ifit-node-capability-02=
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; Hi Chris,<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; Thanks for your quick reply, and please se=
e inline.<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; Cheers,<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; Tianran<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; -----Original Message-----<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; From: Christian Hopps [mailto:<a href=3D"m=
ailto:chopps@chopps.org" target=3D"_blank">chopps@chopps.org</a>]<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; Sent: Wednesday, April 1, 2020 10:00 AM<br=
>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; To: Tianran Zhou &lt;<a href=3D"mailto:zho=
utianran@huawei.com" target=3D"_blank">zhoutianran@huawei.com</a>&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; Cc: Christian Hopps &lt;<a href=3D"mailto:=
chopps@chopps.org" target=3D"_blank">chopps@chopps.org</a>&gt;; wangyali
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; &lt;<a href=3D"mailto:wangyali11@huawei.co=
m" target=3D"_blank">wangyali11@huawei.com</a>&gt;; Les Ginsberg (ginsberg)=
 &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">ginsberg@cisco=
.com</a>&gt;;
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <a href=3D"mailto:lsr@ietf.org" target=3D"=
_blank">lsr@ietf.org</a><br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; Subject: Re: [Lsr] A new version of I-D, <=
br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; draft-liu-lsr-isis-ifit-node-capability-02=
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; &gt; On Mar 31, 2020, at 9:28 PM, Tianran =
Zhou &lt;<a href=3D"mailto:zhoutianran@huawei.com" target=3D"_blank">zhouti=
anran@huawei.com</a>&gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; wrote:<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; &gt;<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; &gt; ZTR&gt; Let&#39;s not boil the ocean =
to compare NETCONF/YANG or routing<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; protocol, which is better. But I did not s=
ee the modification to <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; routing protocol with some TLVs is a heavy=
 work, or more complex than <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; NETCONF/YANG.=C2=A0 I see both are availab=
le and useful.<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; I&#39;m not sure what you mean by boiling =
the ocean. I&#39;m saying that YANG <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; is built and intended for querying capabil=
ities and configuring <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; routers. Why isn&#39;t that where you are =
looking first for configuring your monitoring application?<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; ZTR&gt; I know NETCONF can do both query a=
nd configuration. And I know<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; resent YANG-Push improvements to reduce th=
e polling.=C2=A0 But routing <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; protocol solutions are also widely used fo=
r this. There are already <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; many RFCs and implementation practices. We=
 considered both ways, and <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; aimed for different scenarios.<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; You don&#39;t see the major difference bet=
ween writing a YANG model vs <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; modifying all of the standard IETF routing=
 protocols?<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; ZTR&gt; I know many differences between NE=
TCONF and routing protocol.<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; There are many details on both interfaces,=
 implementations, scenarios <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; when comparing them. That&#39;s what I mea=
n boil the ocean.<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; Here I do not know what&#39;s the &quot;ma=
jor difference&quot; you mean?<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; <br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; Thanks,<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 &gt; Chris.<br>
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 _______________________________________________=
<br>
=C2=A0 =C2=A0 =C2=A0 =C2=A0 Lsr mailing list<br>
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To: draft-wang-lsr-ifit-node-capability-advertisement@ietf.org, lsr@ietf.org,  draft-song-opsawg-ifit-framework@ietf.org, opsawg@ietf.org
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Subject: [Lsr] I,Scope of FIT Capability: a node or a link?
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Dear All,
I've read these two drafts with interest. In light of the discussion on the
LSR WG list, I've been thinking about the scenarios where IFIT is being
used.
draft-song-opsawg-ifit-framework defines the overall IFIT architecture
that, as I understand it, applicable to different methods of collecting and
transporting telemetry
information. draft-wang-lsr-ifit-node-capability-advertisement is based on
the view that IFIT is a node-wide capability advertised as a binary flag
for each listed method of collecting telemetry information (Option-Type
enabled Flag). On-path telemetry collection is performed in the fast path,
i.e., at a link layer. But a node might include ports with different
capabilities. How such a heterogeneous, IFIT-wise, node will advertise IFIT
Capability? To better use available resources for telemetry information
collection, it might be helpful to advertise IFIT as a capability of a
link, not of a node?
What do you think?

Regards,
Greg

--000000000000c5d7be05a281f83d
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<div dir=3D"ltr">Dear All,<div>I&#39;ve read these two drafts with interest=
. In light=C2=A0of the discussion on the LSR WG list, I&#39;ve been thinkin=
g about the scenarios where IFIT is being used.</div><div>draft-song-opsawg=
-ifit-framework defines the overall IFIT architecture that, as I understand=
 it, applicable to different methods of collecting and transporting telemet=
ry information.=C2=A0draft-wang-lsr-ifit-node-capability-advertisement is b=
ased on the view=C2=A0that IFIT is a node-wide capability advertised as a b=
inary flag for each listed method of collecting telemetry information (Opti=
on-Type enabled Flag). On-path telemetry collection is performed in the fas=
t path, i.e., at a link layer. But a node might include ports with differen=
t capabilities. How such a heterogeneous, IFIT-wise, node will advertise IF=
IT Capability? To better=C2=A0use available resources for telemetry informa=
tion collection, it=C2=A0might be helpful to advertise IFIT as a capability=
 of a link, not of a node?<br></div><div>What do you=C2=A0think?</div><div>=
<br></div><div>Regards,</div><div>Greg</div></div>

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Date: Sun, 5 Apr 2020 16:46:24 -0700
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: draft-wang-lsr-ifit-node-capability-advertisement@ietf.org,  lsr@ietf.org, draft-song-opsawg-ifit-framework@ietf.org,  opsawg@ietf.org, Greg Mirsky <gregimirsky@gmail.com>
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Subject: Re: [Lsr] I,Scope of FIT Capability: a node or a link?
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Very valid comment - When working on MSD - we had exactly same considerat=
ions, since path computation could use different links over different lin=
e cards that may have different capabilities, hence we decided to have pe=
r link granularity, details in R=46C 8491

Cheers,
Jeff
On Apr 4, 2020, 7:33 PM -0700, Greg Mirsky <gregimirsky=40gmail.com>, wro=
te:
> Dear All,
> I've read these two drafts with interest.. In light=C2=A0of the discuss=
ion on the LSR WG list, I've been thinking about the scenarios where I=46=
IT is being used.
> draft-song-opsawg-ifit-framework defines the overall I=46IT architectur=
e that, as I understand it, applicable to different methods of collecting=
 and transporting telemetry information.=C2=A0draft-wang-lsr-ifit-node-ca=
pability-advertisement is based on the view=C2=A0that I=46IT is a node-wi=
de capability advertised as a binary flag for each listed method of colle=
cting telemetry information (Option-Type enabled =46lag). On-path telemet=
ry collection is performed in the fast path, i.e., at a link layer. But a=
 node might include ports with different capabilities. How such a heterog=
eneous, I=46IT-wise, node will advertise I=46IT Capability=3F To better=C2=
=A0use available resources for telemetry information collection, it=C2=A0=
might be helpful to advertise I=46IT as a capability of a link, not of a =
node=3F
> What do you=C2=A0think=3F
>
> Regards,
> Greg
> =5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F
> Lsr mailing list
> Lsr=40ietf.org
> https://www.ietf.org/mailman/listinfo/lsr

--5e8a6dd5_f641ca2_16f
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<html xmlns=3D=22http://www.w3.org/1999/xhtml=22>
<head>
<title></title>
</head>
<body>
<div name=3D=22messageBodySection=22>
<div dir=3D=22auto=22>Very valid comment - When working on MSD - we had e=
xactly same considerations, since path computation could use different li=
nks over different line cards that may have different capabilities, hence=
 we decided to have per link granularity, details in R=46C 8491&=23160;&=23=
160;</div>
</div>
<div name=3D=22messageSignatureSection=22><br />
<div class=3D=22match=46ont=22>Cheers,
<div>Jeff</div>
</div>
</div>
<div name=3D=22messageReplySection=22>On Apr 4, 2020, 7:33 PM -0700, Greg=
 Mirsky &lt;gregimirsky=40gmail.com&gt;, wrote:<br />
<blockquote type=3D=22cite=22 class=3D=22spark=5Fquote=22 style=3D=22marg=
in: 5px 5px; padding-left: 10px; border-left: thin solid =231abc9c;=22>
<div dir=3D=22ltr=22>Dear All,
<div>I've read these two drafts with interest.. In light&=23160;of the di=
scussion on the LSR WG list, I've been thinking about the scenarios where=
 I=46IT is being used.</div>
<div>draft-song-opsawg-ifit-framework defines the overall I=46IT architec=
ture that, as I understand it, applicable to different methods of collect=
ing and transporting telemetry information.&=23160;draft-wang-lsr-ifit-no=
de-capability-advertisement is based on the view&=23160;that I=46IT is a =
node-wide capability advertised as a binary flag for each listed method o=
f collecting telemetry information (Option-Type enabled =46lag). On-path =
telemetry collection is performed in the fast path, i.e., at a link layer=
. But a node might include ports with different capabilities. How such a =
heterogeneous, I=46IT-wise, node will advertise I=46IT Capability=3F To b=
etter&=23160;use available resources for telemetry information collection=
, it&=23160;might be helpful to advertise I=46IT as a capability of a lin=
k, not of a node=3F<br /></div>
<div>What do you&=23160;think=3F</div>
<div><br /></div>
<div>Regards,</div>
<div>Greg</div>
</div>
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F<br />
Lsr mailing list<br />
Lsr=40ietf.org<br />
https://www.ietf.org/mailman/listinfo/lsr<br /></blockquote>
</div>
</body>
</html>

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To: Chris Bowers <chrisbowers.ietf@gmail.com>
Cc: "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>, SPRING WG List <spring@ietf.org>, Bruno Decraene <bruno.decraene@orange.com>
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From: Peter Psenak <ppsenak@cisco.com>
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Date: Mon, 6 Apr 2020 13:03:09 +0200
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/n-TGihGoqgDITt6_tI4q3TfBWi0>
Subject: Re: [Lsr] clarification of locator block and locator node in draft-ietf-spring-srv6-network-programming and draft-ietf-lsr-isis-srv6-extensions
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Chris,

On 01/04/2020 21:58, Chris Bowers wrote:
> Peter,
> 
> There seem to be two disconnects in this discussion.
> 
> 1) The response below implies that the encodings in 
> draft-ietf-lsr-isis-srv6-extensions are supposed represent the case 
> where the locators are allocated from several different IPv6 address 
> blocks (for example, blocks S1/s1 through Sn/sn). However, 
> draft-ietf-spring-srv6-network-programming and 
> draft-ietf-6man-segment-routing-header only discuss the case where the 
> locators are allocated from a single block (S/s).  If an implementation 
> is expected to properly encode the case where locators are allocated 
> from several different IPv6 address blocks, then I think that case 
> should be explicitly described in these documents.


There is no statement in draft-ietf-spring-srv6-network-programming that 
the block is unique. As an example, Iliad authorized me to indicate that 
their SRv6 deployment involves several blocks.


> 
> 2)   The response below says "To be able to find out where the func and 
> arg are located, you need to know the LOC length, e.g. Block and Node 
> length."  However, the SRv6 SID Structure Sub-Sub-TLV is carried within 
> the SRv6 End SID, SRv6 End.X SID, and the SRv6 LAN End.X SID Sub-TLVs, 
> which are carried within the SRv6 Locator TLV.  

not really. SRv6 End.X SID, and the SRv6 LAN End.X SID Sub-TLVs are 
advertised in the IS Reachability TLVs (22, 23, 222, 223, 141), not in 
SRv6 Locator TLV.

thanks,
Peter


> The  SRv6 Locator TLV 
> has a Loc-Size field.  Why would the value of the LOC length computed as 
> the sum of the Block and Node length ever be different from the value in 
> the Loc-Size field?
> 
> Chris
> 
> 
> On Wed, Mar 25, 2020 at 9:49 AM Peter Psenak <ppsenak@cisco.com 
> <mailto:ppsenak@cisco.com>> wrote:
> 
>     Chris,
> 
>     please see inline:
> 
> 
>     On 23/03/2020 17:39, Chris Bowers wrote:
>      > Peter,
>      >
>      > The proposed SRv6 SID Structure Sub-Sub-TLV has several problems.
>      >
>      > 1) As discussed in item#3 below, it is not clear that flooding LB
>      > Length, LN Length, Fun. Length, and Arg. Length to all ISIS
>     speakers is
>      > really the right approach.  However, if the WG determines that it
>     is the
>      > right approach, the current encodings of this information in the
>      > proposed SRv6 SID Structure Sub-Sub-TLV are problematic.  As
>     discussed
>      > earlier in this thread, a network operator may choose to not
>     allocate
>      > all locators from a single block, so LB Length and LN Length may
>     not be
>      > well-defined.
> 
>     I'm not sure what do you mean by not "well defined". For every SID you
>     need to know the LOC (B+N) part. If you guarantee that it is the
>     same on
>     all nodes, you know it from the local config, otherwise, you advertise
>     it with a SID.
> 
>      > The current encoding of the SRv6 SID Structure
>      > Sub-Sub-TLV makes it difficult to represent this situation.  The
>     simple
>      > thing to do for nodes that don't have a well-defined value of LB
>     Length
>      > and LN Length would be to not advertise a value for LB Length and LN
>      > Length.  However, since the currently proposed SRv6 SID Structure
>      > Sub-Sub-TLV combines LB Length, LN Length, Fun. Length, and Arg.
>     Length
>      > into a single sub-sub-TLV, if a node wants to advertise values
>     for Fun.
>      > Length and Arg. Length, it also has to advertise values for LB
>     Length
>      > and LN Length.  It seems like a better approach would be to have
>      > different sub-sub-TLVs, one for  LB Length and LN Length, and a
>     separate
>      > one for Fun. Length and Arg. Length to be able to better
>     represent this
>      > situation.
> 
> 
>     I'm afraid you are missing an important point.
> 
>     SRv6 SID is defined as LOC:FUNCT:ARG, where LOC is represented as B:N.
>     To be able to find out where the func and arg are located, you need to
>     know the LOC length, e.g. Block and Node length. Advertising just Func
>     and Arg length does not help.
> 
> 
>      >
>      > 2) Now consider the situation where a network operator chooses to
>      > allocate all locators from a single block, so that LB Length and LN
>      > Length are well-defined across the network.  A given node should
>      > presumably advertise its own understanding of LB Length and LN
>     Length.
>      > A given node's understanding of LB Length and LN Length is a
>     property of
>      > the node.  It is not a property of a given End SID.  The currently
>      > proposed SRv6 SID Structure Sub-Sub-TLV however is carried within
>     each
>      > End SID Sub-TLV.  With the currently proposed encoding,
>     presumably an
>      > implementation is expected to send the exact same values of LB
>     Length
>      > and LN Length for all of the End SIDs that it advertises.  Not
>     only is
>      > this inefficient, but it creates the need for logic to decide
>     what to do
>      > when different End SIDs advertised by the same node carry different
>      > values of LB Length and LN Length in their sub-sub-TLVs.  It
>     seems like
>      > a better approach would be for a given node to advertise its
>      > understanding of the value of LB Length and LN Length in a
>     sub-TLV of
>      > the Router Capability TLV.
> 
>     When we design the encoding, we have to define it such, that it
>     supports
>     all possible use cases. We can not design the encoding that works for
>     single use case (allocate all locators from a single block) and does
>     not
>     work for others - different block from different node, multiple blocks
>     on a single node (e.g. border node), which are all valid.
> 
>      >
>      > 3) At this point, the only use case that has been proposed for
>     flooding
>      > the LB Length, LN Length, Fun. Length, and Arg. Length to all ISIS
>      > speakers is to make it more convenient for BGP-LS to get those
>     values to
>      > an external controller as part of a topology feed from any ISIS
>     node.
>      > No use case has been proposed for ISIS speakers themselves to
>     make use
>      > of the information.  It seems like a more scalable approach would
>     be to
>      > use BGP-LS sessions to collect the information from the subset of
>     nodes
>      > that actually produce the relevant information.  So far there are
>     no End
>      > SIDs defined that are advertised in ISIS that have a non-zero Arg.
>      > Length.  If an End SID with non-zero Arg. Length were to be
>     proposed in
>      > the future as needing to be flooded to all ISIS nodes, it seems
>     likely
>      > that the new End SID would also be advertised using the BGP
>     IP/VPN/EVPN
>      > control plane.   So it seems like a viable alternative for this
>      > hypothetical future End SID would be to have the subset of nodes
>     that
>      > have non-zero Arg. Length values communicate to an external
>     controller
>      > via  BGP sessions. I think the WG needs a more detailed
>     discussion of a
>      > concrete use case in order to determine whether flooding LB
>     Length, LN
>      > Length, Fun. Length, and Arg. Length to all ISIS speakers is
>     really the
>      > right approach.
> 
>     there are networks, where BGP is not deployed on all nodes, only on a
>     few nodes that re-distribute the information to BGP-LS. In such case we
>     need the IGP to distribute this data.
> 
>     Argument that "it seems likely that the new End SID would also be
>     advertised using the BGP IP/VPN/EVPN" is a wishful thinking that we can
>     not based our encoding on.
> 
> 
>      >
>      > Given the lack of a compelling use case for flooding LB Length, LN
>      > Length, Fun. Length, and Arg. Length to all ISIS speakers and the
>      > problems with the currently proposed encodings for doing that, I
>     think
>      > that the SRv6 SID Structure Sub-Sub-TLV should be removed from
>      > draft-ietf-lsr-isis-srv6-extensions. A mechanism for flooding LB
>     Length,
>      > LN Length, Fun. Length, and Arg. Length to all ISIS speakers can be
>      > defined in a future document.
> 
>     The security use case has already been pointed out earlier in this
>     thread:
> 
>     https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#section-5
> 
>     Given the arguments I mentioned above, I respectfully disagree with the
>     removal of the SID Structure Sub-Sub-TLV from the ISIS SRv6 draft.
> 
>     thanks,
>     Peter
> 
> 
>      >
>      > Thanks,
>      > Chris
>      >
>      > On Fri, Mar 13, 2020 at 5:02 AM Peter Psenak <ppsenak@cisco.com
>     <mailto:ppsenak@cisco.com>
>      > <mailto:ppsenak@cisco.com <mailto:ppsenak@cisco.com>>> wrote:
>      >
>      >     Hi Chris,
>      >
>      >     On 12/03/2020 15:58, Chris Bowers wrote:
>      >      > Peter,
>      >      >
>      >      > I think that the SRv6 SID Structure Sub-Sub-TLV should be
>     removed
>      >     from
>      >      > draft-ietf-lsr-isis-srv6-extensions.  I think that we should
>      >     leave the
>      >      > ability to include sub-sub-TLVs in the SRv6 End SID Sub-TLV,
>      >     End.X SID
>      >      > Sub-TLV, and LAN End.X SID Sub-TLV in the encodings for those
>      >     sub-TLVs.
>      >      >
>      >      > I don't think that the current text describing the SRv6 SID
>      >     Structure
>      >      > Sub-Sub-TLV would result in interoperable
>     implementations.  Based
>      >     on the
>      >
>      >     SRv6 base spec defines SID B, L, A, F.
>      >
>      >     SRv6 protocol specs are advertising these values with the
>     SRv6 SID,
>      >     they
>      >     don't use them. The usage is outside of the scope of the protocol
>      >     drafts. What exactly is the problem?
>      >
>      >     thanks,
>      >     Peter
>      >
>      >
>      >      > discussion with Ketan below, it appears that use cases for
>     ISIS
>      >     speakers
>      >      > receiving advertised values of LB Length, LN Length, Fun.
>     Length,
>      >     and
>      >      > Arg. Length are not currently well-defined.    So I think it
>      >     makes sense
>      >      > to defer the definition of the SRv6 SID Structure
>     Sub-Sub-TLV to a
>      >      > future document.
>      >      >
>      >      > Thanks,
>      >      > Chris
>      >      >
>      >      > On Thu, Mar 12, 2020 at 6:02 AM Ketan Talaulikar (ketant)
>      >      > <ketant@cisco.com <mailto:ketant@cisco.com>
>     <mailto:ketant@cisco.com <mailto:ketant@cisco.com>>
>      >     <mailto:ketant@cisco.com <mailto:ketant@cisco.com>
>     <mailto:ketant@cisco.com <mailto:ketant@cisco.com>>>> wrote:
>      >      >
>      >      >     Hi Chris,____
>      >      >
>      >      >     __ __
>      >      >
>      >      >     Dropping the
>     draft-ietf-spring-srv6-network-programming authors
>      >      >     since we are now back to discussing the ISIS
>     extensions.____
>      >      >
>      >      >     __ __
>      >      >
>      >      >     Please check inline below.____
>      >      >
>      >      >     __ __
>      >      >
>      >      >     *From:*Chris Bowers <chrisbowers.ietf@gmail.com
>     <mailto:chrisbowers.ietf@gmail.com>
>      >     <mailto:chrisbowers.ietf@gmail.com
>     <mailto:chrisbowers.ietf@gmail.com>>
>      >      >     <mailto:chrisbowers.ietf@gmail.com
>     <mailto:chrisbowers.ietf@gmail.com>
>      >     <mailto:chrisbowers.ietf@gmail.com
>     <mailto:chrisbowers.ietf@gmail.com>>>>
>      >      >     *Sent:* 05 March 2020 21:53
>      >      >     *To:* Ketan Talaulikar (ketant) <ketant@cisco.com
>     <mailto:ketant@cisco.com>
>      >     <mailto:ketant@cisco.com <mailto:ketant@cisco.com>>
>      >      >     <mailto:ketant@cisco.com <mailto:ketant@cisco.com>
>     <mailto:ketant@cisco.com <mailto:ketant@cisco.com>>>>
>      >      >     *Cc:* Ketan Talaulikar (ketant) <ketant@cisco.com
>     <mailto:ketant@cisco.com>
>      >     <mailto:ketant@cisco.com <mailto:ketant@cisco.com>>
>      >      >     <mailto:ketant@cisco.com <mailto:ketant@cisco.com>
>     <mailto:ketant@cisco.com <mailto:ketant@cisco.com>>>>;
>      > lsr@ietf.org <mailto:lsr@ietf.org> <mailto:lsr@ietf.org
>     <mailto:lsr@ietf.org>> <mailto:lsr@ietf.org <mailto:lsr@ietf.org>
>      >     <mailto:lsr@ietf.org <mailto:lsr@ietf.org>>>;
>      >      >     SPRING WG List <spring@ietf.org
>     <mailto:spring@ietf.org> <mailto:spring@ietf.org
>     <mailto:spring@ietf.org>>
>      >     <mailto:spring@ietf.org <mailto:spring@ietf.org>
>     <mailto:spring@ietf.org <mailto:spring@ietf.org>>>>;
>      >      >     draft-ietf-spring-srv6-network-programming
>      >      >     <draft-ietf-spring-srv6-network-programming@ietf.org
>     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org>
>      >     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org
>     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org>>
>      >      >   
>       <mailto:draft-ietf-spring-srv6-network-programming@ietf.org
>     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org>
>      >     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org
>     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org>>>>; Peter
>      >      >     Psenak (ppsenak) <ppsenak@cisco.com
>     <mailto:ppsenak@cisco.com>
>      >     <mailto:ppsenak@cisco.com <mailto:ppsenak@cisco.com>>
>     <mailto:ppsenak@cisco.com <mailto:ppsenak@cisco.com>
>      >     <mailto:ppsenak@cisco.com <mailto:ppsenak@cisco.com>>>>;
>      >      >     Bruno Decraene <bruno.decraene@orange.com
>     <mailto:bruno.decraene@orange.com>
>      >     <mailto:bruno.decraene@orange.com
>     <mailto:bruno.decraene@orange.com>>
>      >      >     <mailto:bruno.decraene@orange.com
>     <mailto:bruno.decraene@orange.com>
>      >     <mailto:bruno.decraene@orange.com
>     <mailto:bruno.decraene@orange.com>>>>
>      >      >     *Subject:* Re: [Lsr] clarification of locator block and
>      >     locator node
>      >      >     in draft-ietf-spring-srv6-network-programming and
>      >      >     draft-ietf-lsr-isis-srv6-extensions____
>      >      >
>      >      >     __ __
>      >      >
>      >      >     Ketan,____
>      >      >
>      >      >     __ __
>      >      >
>      >      >     See inline [CB].____
>      >      >
>      >      >     __ __
>      >      >
>      >      >     On Wed, Mar 4, 2020 at 12:36 AM Ketan Talaulikar (ketant)
>      >      >     <ketant@cisco.com <mailto:ketant@cisco.com>
>     <mailto:ketant@cisco.com <mailto:ketant@cisco.com>>
>      >     <mailto:ketant@cisco.com <mailto:ketant@cisco.com>
>     <mailto:ketant@cisco.com <mailto:ketant@cisco.com>>>> wrote:____
>      >      >
>      >      >         Hi Chris,____
>      >      >
>      >      >         ____
>      >      >
>      >      >         You are right in that there is no assumption that
>     all SRv6
>      >      >         locators in a domain are allocated from the same
>     block.
>      >      >         Therefore knowing the blocks used in the domain is
>      >     useful.____
>      >      >
>      >      >     ____
>      >      >
>      >      >     [CB] Since you refer to "blocks" (plural) in this
>     sentence,
>      >     are you
>      >      >     saying that in the scenario where all SRv6 locators in a
>      >     domain are
>      >      >     not allocated from the same block, you would expect
>     different
>      >      >     routers in the same domain to advertise different
>     values of B
>      >     and N?
>      >      >     ____
>      >      >
>      >      >     */[KT] While personally I believe it would not be the
>     usual
>      >     case, it
>      >      >     is left to the operator.____/*
>      >      >
>      >      >     */__ __/*
>      >      >
>      >      >     For example, assume we have a network where all SRv6
>     locators
>      >     in a
>      >      >     domain are not allocated from the same block.  Router A
>      >     advertises
>      >      >     an SRv6 Locator TLV with locator = 2000::/64, and an
>     SRv6 End SID
>      >      >     sub-TLV with some endpoint behavior. Router B
>     advertises an SRv6
>      >      >     Locator TLV with locator = 3000::/64, and an SRv6 End
>     SID sub-TLV
>      >      >     with some endpoint behavior. What should routers A and B
>      >     advertise
>      >      >     as the values of B and N in their SRv6 SID Structure
>      >     Sub-Sub-TLVs ?____
>      >      >
>      >      >     */[KT] It is difficult for me to figure out what the block
>      >     and node
>      >      >     parts are with such an addressing./*____
>      >      >
>      >      >     ____
>      >      >
>      >      >         ____
>      >      >
>      >      >         The IGP drafts covers the advertisement of the B and N
>      >     parts of
>      >      >         the locally configured locator on the node via
>     IGPs. On the
>      >      >         receiver side, the IGP may not really do much with
>     this
>      >      >         information, however it enables propagation of this
>      >     information
>      >      >         from all nodes in the network to be advertised out
>     via BGP-LS
>      >      >         (or other mechanisms) as part of the topology
>     feed. Once
>      >     this is
>      >      >         part of the topology feed, it enables use-cases on
>      >     controllers
>      >      >         to perform network wide validation of the SRv6 SID
>     block
>      >      >         provisioning and can also help in automation of
>     the security
>      >      >         aspects described in
>      >      >
>      >
>     https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#section-5____
>      >      >
>      >      >         ____
>      >      >
>      >      >     [CB] If an ISIS speaker is not expected to do anything
>     with B
>      >     and N,
>      >      >     then I think the text in
>     draft-ietf-lsr-isis-srv6-extensions
>      >     needs
>      >      >     to clarify this.  I have a similar observation about Fun.
>      >     Length and
>      >      >     Arg. Length in the SRv6 SID Structure Sub-Sub-TLV . 
>     As far
>      >     as I can
>      >      >     tell, none of the endpoint behaviors that are currently
>      >     specified to
>      >      >     be carried in ISIS End, End.X, and LAN End.X SIDs sub-TLVs
>      >     uses an
>      >      >     Argument, so there is never a case where an SRv6 SID
>     Structure
>      >      >     Sub-Sub-TLV should have a non-zero value for Arg.
>     Length. What
>      >      >     should an ISIS speaker do if it receives a non-zero
>     value of the
>      >      >     Arg. Length for an endpoint behavior that doesn't use an
>      >     argument?
>      >      >     Are there any use cases envisioned where an ISIS
>     speaker needs to
>      >      >     know the Arg. Length ? ____
>      >      >
>      >      >     */[KT] The behaviors currently listed in the draft do
>     not have an
>      >      >     argument nor is the use of B and N required for them.
>     We cannot
>      >      >     preclude a future use-case or extension where such
>     behaviors
>      >      >     introduced are also applicable to ISIS. So IMHO ruling
>     such
>      >     aspects
>      >      >     out might not be the right thing to do from a protocol
>      >     extensibility
>      >      >     perspective.____/*
>      >      >
>      >      >     */__ __/*
>      >      >
>      >      >     */Thanks,____/*
>      >      >
>      >      >     */Ketan/*____
>      >      >
>      >      >     __ __
>      >      >
>      >      >         Thanks,____
>      >      >
>      >      >         Ketan____
>      >      >
>      >      >         ____
>      >      >
>      >      >         *From:*Chris Bowers <chrisbowers.ietf@gmail.com
>     <mailto:chrisbowers.ietf@gmail.com>
>      >     <mailto:chrisbowers.ietf@gmail.com
>     <mailto:chrisbowers.ietf@gmail.com>>
>      >      >         <mailto:chrisbowers.ietf@gmail.com
>     <mailto:chrisbowers.ietf@gmail.com>
>      >     <mailto:chrisbowers.ietf@gmail.com
>     <mailto:chrisbowers.ietf@gmail.com>>>>
>      >      >         *Sent:* 02 March 2020 23:39
>      >      >         *To:* Ketan Talaulikar (ketant) <ketant@cisco.com
>     <mailto:ketant@cisco.com>
>      >     <mailto:ketant@cisco.com <mailto:ketant@cisco.com>>
>      >      >         <mailto:ketant@cisco.com <mailto:ketant@cisco.com>
>     <mailto:ketant@cisco.com <mailto:ketant@cisco.com>>>>
>      >      >         *Cc:* Ketan Talaulikar (ketant)
>      >      >         <ketant=40cisco.com@dmarc.ietf.org
>     <mailto:40cisco.com@dmarc.ietf.org>
>      >     <mailto:40cisco.com@dmarc.ietf.org
>     <mailto:40cisco.com@dmarc.ietf.org>>
>      >      >         <mailto:40cisco..com@dmarc.ietf.org
>     <mailto:40cisco..com@dmarc.ietf.org>
>      >     <mailto:40cisco..com@dmarc.ietf.org
>     <mailto:40cisco..com@dmarc.ietf.org>>>>; lsr@ietf.org
>     <mailto:lsr@ietf.org>
>      >     <mailto:lsr@ietf.org <mailto:lsr@ietf.org>>
>      >      >         <mailto:lsr@ietf.org <mailto:lsr@ietf.org>
>     <mailto:lsr@ietf.org <mailto:lsr@ietf.org>>>; SPRING WG
>      >     List <spring@ietf.org <mailto:spring@ietf.org>
>     <mailto:spring@ietf.org <mailto:spring@ietf.org>>
>      >      >         <mailto:spring@ietf.org <mailto:spring@ietf.org>
>     <mailto:spring@ietf.org <mailto:spring@ietf.org>>>>;
>      >      >         draft-ietf-spring-srv6-network-programming
>      >      >       
>       <draft-ietf-spring-srv6-network-programming@ietf.org
>     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org>
>      >     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org
>     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org>>
>      >      >
>      >       <mailto:draft-ietf-spring-srv6-network-programming@ietf.org
>     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org>
>      >     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org
>     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org>>>>;
>      >      >         Peter Psenak (ppsenak) <ppsenak@cisco.com
>     <mailto:ppsenak@cisco.com>
>      >     <mailto:ppsenak@cisco.com <mailto:ppsenak@cisco.com>>
>      >      >         <mailto:ppsenak@cisco.com
>     <mailto:ppsenak@cisco.com> <mailto:ppsenak@cisco.com
>     <mailto:ppsenak@cisco.com>>>>;
>      >     Bruno Decraene
>      >      >         <bruno.decraene@orange.com
>     <mailto:bruno.decraene@orange.com>
>      >     <mailto:bruno.decraene@orange.com
>     <mailto:bruno.decraene@orange.com>>
>     <mailto:bruno.decraene@orange.com <mailto:bruno.decraene@orange.com>
>      >     <mailto:bruno.decraene@orange.com
>     <mailto:bruno.decraene@orange.com>>>>
>      >      >         *Subject:* Re: [Lsr] clarification of locator
>     block and
>      >     locator
>      >      >         node in draft-ietf-spring-srv6-network-programming and
>      >      >         draft-ietf-lsr-isis-srv6-extensions____
>      >      >
>      >      >         ____
>      >      >
>      >      >         Ketan,____
>      >      >
>      >      >         ____
>      >      >
>      >      >         Based on current documents, allocating all SRv6
>     locators
>      >     used in
>      >      >         a domain from a single block is optional.____
>      >      >
>      >      >         ____
>      >      >
>      >      >         However, assuming for the moment that a network
>     operator has
>      >      >         chosen to allocate all SRv6 locators used in a
>     domain from a
>      >      >         single block, so that there is a well-defined
>     value of B
>      >     and N
>      >      >         across a domain, what is the use of having a
>     router advertise
>      >      >         its own understanding of these two values?  And
>     what is a
>      >      >         receiver supposed to do with this information?____
>      >      >
>      >      >         ____
>      >      >
>      >      >         Thanks,____
>      >      >
>      >      >         Chris____
>      >      >
>      >      >         ____
>      >      >
>      >      >         On Fri, Feb 28, 2020 at 8:23 AM
>      >     <bruno.decraene@orange.com <mailto:bruno.decraene@orange.com>
>     <mailto:bruno.decraene@orange.com <mailto:bruno.decraene@orange.com>>
>      >      >         <mailto:bruno.decraene@orange.com
>     <mailto:bruno.decraene@orange.com>
>      >     <mailto:bruno.decraene@orange.com
>     <mailto:bruno.decraene@orange.com>>>> wrote:____
>      >      >
>      >      >             Hi Ketan,____
>      >      >
>      >      >             ____
>      >      >
>      >      >             Thanks fort the follow up.____
>      >      >
>      >      >             Clarification inline [Bruno]____
>      >      >
>      >      >             ____
>      >      >
>      >      >             *From**:*Ketan Talaulikar (ketant)
>      >     [mailto:ketant@cisco.com <mailto:ketant@cisco.com>
>     <mailto:ketant@cisco.com <mailto:ketant@cisco.com>>
>      >      >             <mailto:ketant@cisco.com
>     <mailto:ketant@cisco.com> <mailto:ketant@cisco.com
>     <mailto:ketant@cisco.com>>>]
>      >      >             *Sent:* Friday, February 28, 2020 11:11 AM
>      >      >             *To:* DECRAENE Bruno TGI/OLN; Ketan Talaulikar
>     (ketant);
>      >      >             Chris Bowers
>      >      >             *Cc:* lsr@ietf.org <mailto:lsr@ietf.org>
>     <mailto:lsr@ietf.org <mailto:lsr@ietf.org>>
>      >     <mailto:lsr@ietf.org <mailto:lsr@ietf.org>
>     <mailto:lsr@ietf.org <mailto:lsr@ietf.org>>>; SPRING WG List;
>      >      >             draft-ietf-spring-srv6-network-programming;
>     Peter Psenak
>      >      >             (ppsenak)
>      >      >             *Subject:* RE: [Lsr] clarification of locator
>     block and
>      >      >             locator node in
>      >     draft-ietf-spring-srv6-network-programming
>      >      >             and draft-ietf-lsr-isis-srv6-extensions____
>      >      >
>      >      >             ____
>      >      >
>      >      >             Hi Bruno,____
>      >      >
>      >      >             ____
>      >      >
>      >      >             I believe the description and usage of Locator is
>      >     very well
>      >      >             described and covered in the net-pgm draft as
>     also the
>      >      >             corresponding IGP extensions. Is the question
>     is more
>      >     about
>      >      >             the “block” part of it (what is not in the
>     block part
>      >     is in
>      >      >             the node part as per the text in the net-pgm
>     draft)?____
>      >      >
>      >      >             ____
>      >      >
>      >      >             The “block” is again not a new thing. Please
>     check the
>      >      >             following:____
>      >      >
>      >      >             Under
>      >      >
>      >
>     https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#section-5
>      >      >             … look for “block”____
>      >      >
>      >      > https://tools.ietf.org/html/rfc8402#section-2 … look under
>      >      >             SRGB for SRv6____
>      >      >
>      >      >             ____
>      >      >
>      >      >             [Bruno]____
>      >      >
>      >      >             To clarify, my question was not specific to
>     “block” but
>      >      >             related to the usage, by the receiver, of the
>     following
>      >      >             piece of information:____
>      >      >
>      >      >             ____
>      >      >
>      >      >                    LB Length: SRv6 SID Locator Block
>     length____
>      >      >
>      >      >                    LN Length: SRv6 SID Locator Node length____
>      >      >
>      >      >                    Fun. Length: SRv6 SID Function length____
>      >      >
>      >      >                    Arg. Length: SRv6 SID Arguments length____
>      >      >
>      >      >             ____
>      >      >
>      >      >             ____
>      >      >
>      >      >             So perhaps I don’t get Chris’s point and would
>     wait
>      >     for him
>      >      >             to clarify.____
>      >      >
>      >      >             [Bruno] I’ll leave this to Chris.____
>      >      >
>      >      >             ____
>      >      >
>      >      >             Thanks,____
>      >      >
>      >      >             Ketan____
>      >      >
>      >      >             ____
>      >      >
>      >      >             *From:*Lsr <lsr-bounces@ietf.org
>     <mailto:lsr-bounces@ietf.org>
>      >     <mailto:lsr-bounces@ietf.org <mailto:lsr-bounces@ietf.org>>
>      >      >             <mailto:lsr-bounces@ietf.org
>     <mailto:lsr-bounces@ietf.org>
>      >     <mailto:lsr-bounces@ietf.org <mailto:lsr-bounces@ietf.org>>>>
>     *On Behalf Of
>      >      >             *bruno.decraene@orange.com
>     <mailto:bruno.decraene@orange.com>
>      >     <mailto:bruno.decraene@orange.com
>     <mailto:bruno.decraene@orange.com>>
>     <mailto:bruno.decraene@orange.com <mailto:bruno.decraene@orange.com>
>      >     <mailto:bruno.decraene@orange.com
>     <mailto:bruno.decraene@orange.com>>>
>      >      >             *Sent:* 28 February 2020 14:34
>      >      >             *To:* Ketan Talaulikar (ketant)
>      >      >             <ketant=40cisco.com@dmarc.ietf.org
>     <mailto:40cisco.com@dmarc.ietf.org>
>      >     <mailto:40cisco.com@dmarc.ietf.org
>     <mailto:40cisco.com@dmarc.ietf.org>>
>      >      >             <mailto:40cisco..com@dmarc.ietf.org
>     <mailto:40cisco..com@dmarc.ietf.org>
>      >     <mailto:40cisco..com@dmarc.ietf.org
>     <mailto:40cisco..com@dmarc.ietf.org>>>>; Chris Bowers
>      >      >             <chrisbowers.ietf@gmail.com
>     <mailto:chrisbowers.ietf@gmail.com>
>      >     <mailto:chrisbowers.ietf@gmail.com
>     <mailto:chrisbowers.ietf@gmail.com>>
>      >     <mailto:chrisbowers.ietf@gmail.com
>     <mailto:chrisbowers.ietf@gmail.com>
>     <mailto:chrisbowers.ietf@gmail.com
>     <mailto:chrisbowers.ietf@gmail.com>>>>
>      >      >             *Cc:* lsr@ietf.org <mailto:lsr@ietf.org>
>     <mailto:lsr@ietf.org <mailto:lsr@ietf.org>>
>      >     <mailto:lsr@ietf.org <mailto:lsr@ietf.org>
>     <mailto:lsr@ietf.org <mailto:lsr@ietf.org>>>; SPRING WG List
>      >      >             <spring@ietf.org <mailto:spring@ietf.org>
>     <mailto:spring@ietf.org <mailto:spring@ietf.org>>
>      >     <mailto:spring@ietf.org <mailto:spring@ietf.org>
>     <mailto:spring@ietf.org <mailto:spring@ietf.org>>>>;
>      >      >             draft-ietf-spring-srv6-network-programming
>      >      >           
>       <draft-ietf-spring-srv6-network-programming@ietf.org
>     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org>
>      >     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org
>     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org>>
>      >      >
>      >       <mailto:draft-ietf-spring-srv6-network-programming@ietf.org
>     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org>
>      >     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org
>     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org>>>>;
>      >      >             Peter Psenak (ppsenak) <ppsenak@cisco.com
>     <mailto:ppsenak@cisco.com>
>      >     <mailto:ppsenak@cisco.com <mailto:ppsenak@cisco.com>>
>      >      >             <mailto:ppsenak@cisco.com
>     <mailto:ppsenak@cisco.com> <mailto:ppsenak@cisco.com
>     <mailto:ppsenak@cisco.com>>>>
>      >      >             *Subject:* Re: [Lsr] clarification of locator
>     block and
>      >      >             locator node in
>      >     draft-ietf-spring-srv6-network-programming
>      >      >             and draft-ietf-lsr-isis-srv6-extensions____
>      >      >
>      >      >             ____
>      >      >
>      >      >             Hi Ketan,____
>      >      >
>      >      >             ____
>      >      >
>      >      >             ____
>      >      >
>      >      >             ____
>      >      >
>      >      >             *From:*Lsr [mailto:lsr-bounces@ietf.org
>     <mailto:lsr-bounces@ietf.org>
>      >     <mailto:lsr-bounces@ietf.org <mailto:lsr-bounces@ietf.org>>]
>     *On Behalf Of
>      >      >             *Ketan Talaulikar (ketant)
>      >      >             *Sent:* Friday, February 28, 2020 6:30 AM____
>      >      >
>      >      >             ____
>      >      >
>      >      >             Hi Chris,____
>      >      >
>      >      >             ____
>      >      >
>      >      >             I agree with Peter and I would suggest to drop
>     LSR since
>      >      >             this is not a protocol specific thing.____
>      >      >
>      >      >             ____
>      >      >
>      >      >             I believe the text in
>      >      >             draft-ietf-spring-srv6-network-programming clears
>      >     says what
>      >      >             locator block and locator node are. What more
>     details
>      >     do you
>      >      >             think are required?____
>      >      >
>      >      >             ____
>      >      >
>      >      >             [Bruno] Speaking as an individual, the draft could
>      >     possibly
>      >      >             clarify the usage of these information/fields
>     by the
>      >      >             receiver. Possibly using the same name/term (e.g.
>      >     SRv6 SID
>      >      >             Locator Block length) to ease the references
>     between both
>      >      >             drafts.____
>      >      >
>      >      >             ____
>      >      >
>      >      >             Thanks,____
>      >      >
>      >      >             --Bruno____
>      >      >
>      >      >             ____
>      >      >
>      >      >             Thanks,____
>      >      >
>      >      >             Ketan____
>      >      >
>      >      >             ____
>      >      >
>      >      >             *From:*Lsr <lsr-bounces@ietf.org
>     <mailto:lsr-bounces@ietf.org>
>      >     <mailto:lsr-bounces@ietf.org <mailto:lsr-bounces@ietf.org>>
>      >      >             <mailto:lsr-bounces@ietf.org
>     <mailto:lsr-bounces@ietf.org>
>      >     <mailto:lsr-bounces@ietf.org <mailto:lsr-bounces@ietf.org>>>>
>     *On Behalf Of *Chris Bowers
>      >      >             *Sent:* 27 February 2020 22:46
>      >      >             *To:* lsr@ietf.org <mailto:lsr@ietf.org>
>     <mailto:lsr@ietf.org <mailto:lsr@ietf.org>>
>      >     <mailto:lsr@ietf.org <mailto:lsr@ietf.org>
>     <mailto:lsr@ietf.org <mailto:lsr@ietf.org>>>; SPRING WG List
>      >      >             <spring@ietf.org <mailto:spring@ietf.org>
>     <mailto:spring@ietf.org <mailto:spring@ietf.org>>
>      >     <mailto:spring@ietf.org <mailto:spring@ietf.org>
>     <mailto:spring@ietf.org <mailto:spring@ietf.org>>>>
>      >      >             *Cc:* Peter Psenak (ppsenak)
>     <ppsenak@cisco.com <mailto:ppsenak@cisco.com>
>      >     <mailto:ppsenak@cisco.com <mailto:ppsenak@cisco.com>>
>      >      >             <mailto:ppsenak@cisco.com
>     <mailto:ppsenak@cisco.com> <mailto:ppsenak@cisco.com
>     <mailto:ppsenak@cisco.com>>>>
>      >      >             *Subject:* [Lsr] clarification of locator
>     block and
>      >     locator
>      >      >             node in
>     draft-ietf-spring-srv6-network-programming and
>      >      >             draft-ietf-lsr-isis-srv6-extensions____
>      >      >
>      >      >             ____
>      >      >
>      >      >             SPRING and LSR WGs,____
>      >      >
>      >      >             ____
>      >      >
>      >      >             I think that we need a much more detailed
>     description
>      >     of the
>      >      >             locator block and locator node in either
>      >      >             draft-ietf-spring-srv6-network-programming or
>      >      >             draft-ietf-lsr-isis-srv6-extensions.  See
>     original email
>      >      >             below.____
>      >      >
>      >      >             ____
>      >      >
>      >      >             Thanks,____
>      >      >
>      >      >             Chris____
>      >      >
>      >      >             ____
>      >      >
>      >      >             On Thu, Feb 27, 2020 at 11:08 AM Peter Psenak
>      >      >             <ppsenak@cisco.com <mailto:ppsenak@cisco.com>
>     <mailto:ppsenak@cisco.com <mailto:ppsenak@cisco.com>>
>      >     <mailto:ppsenak@cisco.com <mailto:ppsenak@cisco.com>
>     <mailto:ppsenak@cisco.com <mailto:ppsenak@cisco.com>>>> wrote:____
>      >      >
>      >      >                 Hi Chris,
>      >      >
>      >      >                 On 27/02/2020 17:54, Chris Bowers wrote:
>      >      >                  > LSR WG,
>      >      >                  >
>      >      >                  > Section 9 of
>      >     draft-ietf-lsr-isis-srv6-extensions-05
>      >      >                 defines the  SRv6
>      >      >                  > SID Structure Sub-Sub-TLV. In
>     particular, it
>      >     defines
>      >      >                 encoding for the
>      >      >                  > locator block length and the locator
>     node length.
>      >      >                 The text refers to
>      >      >                  >
>     [I-D.ietf-spring-srv6-network-programming] for the
>      >      >                 definition of these
>      >      >                  > concepts.
>      >      >                  >
>      >      >                  > As far as I can tell, the only reference to
>      >     locator
>      >      >                 block and locator
>      >      >                  > node in
>      >     draft-ietf-spring-srv6-network-programming-10
>      >      >                 is section 3.1
>      >      >                  > which has the following text:
>      >      >                  >
>      >      >                  >     A locator may be represented as B:N
>     where B is
>      >      >                 the SRv6 SID block
>      >      >                  >     (IPv6 subnet allocated for SRv6
>     SIDs by the
>      >      >                 operator) and N is the
>      >      >                  >     identifier of the parent node
>      >     instantiating the
>      >      >                 SID...
>      >      >                  >
>      >      >                  > I think that we need a much more detailed
>      >     description
>      >      >                 of the locator
>      >      >                  > block and locator node.
>      >      >
>      >      >                 sure, but that would be in the
>      >      >               
>       draft-ietf-spring-srv6-network-programming-10, not in
>      >      >                 draft-ietf-lsr-isis-srv6-extensions, as
>     these are
>      >     not a
>      >      >                 protocol
>      >      >                 specific constructs.
>      >      >
>      >      >                 thanks,
>      >      >                 Peter
>      >      >
>      >      >                  >
>      >      >                  > Thanks,
>      >      >                  >
>      >      >                  > Chris
>      >      >                  > ____
>      >      >
>      >      >
>      >     
>       _____________________________________________________________________________________________________________________________
>      >      >
>      >      >             ____
>      >      >
>      >      >             Ce message et ses pieces jointes peuvent
>     contenir des
>      >      >             informations confidentielles ou privilegiees et ne
>      >     doivent donc____
>      >      >
>      >      >             pas etre diffuses, exploites ou copies sans
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>      >      >             vous avez recu ce message par erreur, veuillez le
>      >     signaler____
>      >      >
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>      >     jointes.
>      >      >             Les messages electroniques etant susceptibles
>      >     d'alteration,____
>      >      >
>      >      >             Orange decline toute responsabilite si ce
>     message a ete
>      >      >             altere, deforme ou falsifie. Merci.____
>      >      >
>      >      >             ____
>      >      >
>      >      >             This message and its attachments may contain
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>      >      >             privileged information that may be protected
>     by law;____
>      >      >
>      >      >             they should not be distributed, used or copied
>     without
>      >      >             authorisation.____
>      >      >
>      >      >             If you have received this email in error, please
>      >     notify the
>      >      >             sender and delete this message and its
>     attachments.____
>      >      >
>      >      >             As emails may be altered, Orange is not liable for
>      >     messages
>      >      >             that have been modified, changed or falsified.____
>      >      >
>      >      >             Thank you.____
>      >      >
>      >      >
>      >     
>       _____________________________________________________________________________________________________________________________
>      >      >
>      >      >             ____
>      >      >
>      >      >             Ce message et ses pieces jointes peuvent
>     contenir des
>      >      >             informations confidentielles ou privilegiees et ne
>      >     doivent donc____
>      >      >
>      >      >             pas etre diffuses, exploites ou copies sans
>      >     autorisation. Si
>      >      >             vous avez recu ce message par erreur, veuillez le
>      >     signaler____
>      >      >
>      >      >             a l'expediteur et le detruire ainsi que les pieces
>      >     jointes.
>      >      >             Les messages electroniques etant susceptibles
>      >     d'alteration,____
>      >      >
>      >      >             Orange decline toute responsabilite si ce
>     message a ete
>      >      >             altere, deforme ou falsifie. Merci.____
>      >      >
>      >      >             ____
>      >      >
>      >      >             This message and its attachments may contain
>      >     confidential or
>      >      >             privileged information that may be protected
>     by law;____
>      >      >
>      >      >             they should not be distributed, used or copied
>     without
>      >      >             authorisation.____
>      >      >
>      >      >             If you have received this email in error, please
>      >     notify the
>      >      >             sender and delete this message and its
>     attachments.____
>      >      >
>      >      >             As emails may be altered, Orange is not liable for
>      >     messages
>      >      >             that have been modified, changed or falsified.____
>      >      >
>      >      >             Thank you.____
>      >      >
>      >
> 



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From: Tianran Zhou <zhoutianran@huawei.com>
To: Greg Mirsky <gregimirsky@gmail.com>, "draft-wang-lsr-ifit-node-capability-advertisement@ietf.org" <draft-wang-lsr-ifit-node-capability-advertisement@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, "draft-song-opsawg-ifit-framework@ietf.org" <draft-song-opsawg-ifit-framework@ietf.org>, "opsawg@ietf.org" <opsawg@ietf.org>
Thread-Topic: I,Scope of FIT Capability: a node or a link?
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Date: Mon, 6 Apr 2020 14:48:14 +0000
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Subject: Re: [Lsr] I,Scope of FIT Capability: a node or a link?
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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Tianran Zhou <zhoutianran@huawei.com>, Greg Mirsky <gregimirsky@gmail.com>, "draft-wang-lsr-ifit-node-capability-advertisement@ietf.org" <draft-wang-lsr-ifit-node-capability-advertisement@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, "draft-song-opsawg-ifit-framework@ietf.org" <draft-song-opsawg-ifit-framework@ietf.org>, "opsawg@ietf.org" <opsawg@ietf.org>
Thread-Topic: I,Scope of FIT Capability: a node or a link?
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Date: Mon, 6 Apr 2020 15:06:09 +0000
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Subject: Re: [Lsr] I,Scope of FIT Capability: a node or a link?
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From: Tony Li <tony1athome@gmail.com>
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Cc: Tianran Zhou <zhoutianran@huawei.com>, Greg Mirsky <gregimirsky@gmail.com>, "draft-wang-lsr-ifit-node-capability-advertisement@ietf.org" <draft-wang-lsr-ifit-node-capability-advertisement@ietf.org>,  "lsr@ietf.org" <lsr@ietf.org>, "draft-song-opsawg-ifit-framework@ietf.org" <draft-song-opsawg-ifit-framework@ietf.org>,  "opsawg@ietf.org" <opsawg@ietf.org>
To: "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>
References: <4da3d82b084343bfa18de192b1f390b1@huawei.com> <MW3PR11MB4619DBDBD80BC52A92F51176C1C20@MW3PR11MB4619.namprd11.prod.outlook.com>
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Subject: Re: [Lsr] I,Scope of FIT Capability: a node or a link?
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> This discussion is interesting, but please do not ignore the =
considerable feedback from multiple folks indicating that this =
advertisement does not belong in the IGP at all (regardless of scope).
> My opinion on that has not changed.


+1

IS-IS is not the correct place to implement Service Discovery =
mechanisms. The management plane already has ample mechanisms for =
service and capability discovery.

Tony



--Apple-Mail=_F41B94B1-8638-4C5F-BFC9-C80DF9EE10B2
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dus-ascii"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D""><br =
class=3D""><div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D""><span style=3D"font-family: Calibri, sans-serif; font-size: =
11pt;" class=3D"">This discussion is interesting, but please do not =
ignore the considerable feedback from multiple folks indicating that =
this advertisement does not belong in the IGP at all (regardless of =
scope).</span></div><div class=3D""><div class=3D"WordSection1" =
style=3D"page: WordSection1; caret-color: rgb(0, 0, 0); font-family: =
Helvetica; font-size: 14px; font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none;"><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: SimSun;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">My opinion on that has not =
changed.<o:p class=3D""></o:p></span></div></div></div></blockquote><br =
class=3D""></div><div><br class=3D""></div><div>+1</div><div><br =
class=3D""></div><div>IS-IS is not the correct place to implement =
Service Discovery mechanisms. The management plane already has ample =
mechanisms for service and capability discovery.</div><div><br =
class=3D""></div><div>Tony</div><div><br class=3D""></div><br =
class=3D""></body></html>=

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From nobody Mon Apr  6 11:32:55 2020
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Date: Mon, 6 Apr 2020 11:32:47 -0700
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>, Tony Li <tony1athome@gmail.com>
Cc: Greg Mirsky <gregimirsky@gmail.com>,  "=?utf-8?Q?draft-song-opsawg-ifit-framework=40ietf.org?=" <draft-song-opsawg-ifit-framework@ietf.org>,  "=?utf-8?Q?lsr=40ietf.org?=" <lsr@ietf.org>,  "=?utf-8?Q?opsawg=40ietf.org?=" <opsawg@ietf.org>, Tianran Zhou <zhoutianran@huawei.com>,  "=?utf-8?Q?draft-wang-lsr-ifit-node-capability-advertisement=40ietf.org?=" <draft-wang-lsr-ifit-node-capability-advertisement@ietf.org>
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Subject: Re: [Lsr] I,Scope of FIT Capability: a node or a link?
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+1
Please do not take my comments about link vs node capabilities, as support for the solution, they are semantical.

Cheers,
Jeff
On Apr 6, 2020, 8:58 AM -0700, Tony Li <tony1athome@gmail.com>, wrote:
>
>
> > This discussion is interesting, but please do not ignore the considerable feedback from multiple folks indicating that this advertisement does not belong in the IGP at all (regardless of scope).
> > My opinion on that has not changed.
>
>
> +1
>
> IS-IS is not the correct place to implement Service Discovery mechanisms. The management plane already has ample mechanisms for service and capability discovery.
>
> Tony
>
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr

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<html xmlns=3D=22http://www.w3.org/1999/xhtml=22>
<head>
<title></title>
</head>
<body>
<div name=3D=22messageBodySection=22>
<div dir=3D=22auto=22>+1
<div dir=3D=22auto=22>Please do not take my comments about link vs node c=
apabilities, as support for the solution, they are semantical.</div>
</div>
</div>
<div name=3D=22messageSignatureSection=22><br />
<div class=3D=22match=46ont=22>Cheers,
<div>Jeff</div>
</div>
</div>
<div name=3D=22messageReplySection=22>On Apr 6, 2020, 8:58 AM -0700, Tony=
 Li &lt;tony1athome=40gmail.com&gt;, wrote:<br />
<blockquote type=3D=22cite=22 class=3D=22spark=5Fquote=22 style=3D=22marg=
in: 5px 5px; padding-left: 10px; border-left: thin solid =231abc9c;=22><b=
r class=3D=22=22 />
<div><br class=3D=22=22 />
<blockquote type=3D=22cite=22 class=3D=22spark=5Fquote=22 style=3D=22marg=
in: 5px 5px; padding-left: 10px; border-left: thin solid =23e67e22;=22>
<div class=3D=22=22><span style=3D=22font-family: Calibri, sans-serif; fo=
nt-size: 11pt;=22 class=3D=22=22>This discussion is interesting, but plea=
se do not ignore the considerable feedback from multiple folks indicating=
 that this advertisement does not belong in the IGP at all (regardless of=
 scope).</span></div>
<div class=3D=22=22>
<div class=3D=22WordSection1=22 style=3D=22page: WordSection1; caret-colo=
r: rgb(0, 0, 0); font-family: Helvetica; font-size: 14px; font-style: nor=
mal; font-variant-caps: normal; font-weight: normal; letter-spacing: norm=
al; text-align: start; text-indent: 0px; text-transform: none; white-spac=
e: normal; word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decora=
tion: none;=22>
<div style=3D=22margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: S=
imSun;=22 class=3D=22=22><span style=3D=22font-size: 11pt; font-family: C=
alibri, sans-serif;=22 class=3D=22=22>My opinion on that has not changed.=
</span></div>
</div>
</div>
</blockquote>
<br class=3D=22=22 /></div>
<div><br class=3D=22=22 /></div>
<div>+1</div>
<div><br class=3D=22=22 /></div>
<div>IS-IS is not the correct place to implement Service Discovery mechan=
isms. The management plane already has ample mechanisms for service and c=
apability discovery.</div>
<div><br class=3D=22=22 /></div>
<div>Tony</div>
<div><br class=3D=22=22 /></div>
<br class=3D=22=22 />
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F<br />
Lsr mailing list<br />
Lsr=40ietf.org<br />
https://www.ietf.org/mailman/listinfo/lsr<br /></blockquote>
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From nobody Mon Apr  6 11:54:19 2020
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Jeff Tantsura <jefftant.ietf@gmail.com>, "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>, Tony Li <tony1athome@gmail.com>
CC: Greg Mirsky <gregimirsky@gmail.com>, "draft-song-opsawg-ifit-framework@ietf.org" <draft-song-opsawg-ifit-framework@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, "opsawg@ietf.org" <opsawg@ietf.org>, Tianran Zhou <zhoutianran@huawei.com>, "draft-wang-lsr-ifit-node-capability-advertisement@ietf.org" <draft-wang-lsr-ifit-node-capability-advertisement@ietf.org>
Thread-Topic: [Lsr] I,Scope of FIT Capability: a node or a link?
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Subject: Re: [Lsr] I,Scope of FIT Capability: a node or a link?
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From: Tony Przygienda <tonysietf@gmail.com>
Date: Mon, 6 Apr 2020 11:55:55 -0700
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To: "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>
Cc: Tianran Zhou <zhoutianran@huawei.com>, Greg Mirsky <gregimirsky@gmail.com>, "draft-wang-lsr-ifit-node-capability-advertisement@ietf.org" <draft-wang-lsr-ifit-node-capability-advertisement@ietf.org>,  "lsr@ietf.org" <lsr@ietf.org>, "draft-song-opsawg-ifit-framework@ietf.org" <draft-song-opsawg-ifit-framework@ietf.org>,  "opsawg@ietf.org" <opsawg@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/94Lr35Af6SbO3MoMHMBDgoogNIY>
Subject: Re: [Lsr] I,Scope of FIT Capability: a node or a link?
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+1

IGP is NOT an AD scope generic L3 broadcast mechanism ;-)
BGP is NOT an world scope generic L3 broadcast mechanism ;-)

--- tony

On Mon, Apr 6, 2020 at 8:06 AM Les Ginsberg (ginsberg) <ginsberg=3D
40cisco.com@dmarc.ietf.org> wrote:

> This discussion is interesting, but please do not ignore the considerable
> feedback from multiple folks indicating that this advertisement does not
> belong in the IGP at all (regardless of scope).
>
> My opinion on that has not changed.
>
>
>
> Thanx.
>
>
>
>    Les
>
>
>
>
>
>
>
> *From:* Lsr <lsr-bounces@ietf.org> *On Behalf Of *Tianran Zhou
> *Sent:* Monday, April 06, 2020 7:48 AM
> *To:* Greg Mirsky <gregimirsky@gmail.com>;
> draft-wang-lsr-ifit-node-capability-advertisement@ietf.org; lsr@ietf.org;
> draft-song-opsawg-ifit-framework@ietf.org; opsawg@ietf.org
> *Subject:* Re: [Lsr] I,Scope of FIT Capability: a node or a link?
>
>
>
> Hi Greg,
>
>
>
> Thanks very much for your interest on both IFIT framework and IFIT
> capability draft. And thanks for your review comments.
>
> Your perspective on both drafts are correct.
>
> On the node or link capability, thanks for your suggestion.
>
> I agree with both you and Jeff. The link capability can make the
> information more clear and accurate for different scenarios.
>
> Why we only considered the node capability? That=E2=80=99s the trade off =
to reduce
> complexity. We just want to start from simple cases.
>
> If the WG think link capability is necessary, we would like to add link
> capabilities to the update.
>
>
>
> Cheers,
>
> Tianran
>
>
>
> *=E5=8F=91=E4=BB=B6=E4=BA=BA**:* Greg Mirsky [mailto:gregimirsky@gmail.co=
m <gregimirsky@gmail.com>]
>
> *=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4:* 2020=E5=B9=B44=E6=9C=885=E6=97=A5=
 10:33
> *=E6=94=B6=E4=BB=B6=E4=BA=BA:* draft-wang-lsr-ifit-node-capability-advert=
isement@ietf.org;
> lsr@ietf.org; draft-song-opsawg-ifit-framework@ietf.org; opsawg@ietf.org
> *=E4=B8=BB=E9=A2=98:* I,Scope of FIT Capability: a node or a link?
>
>
>
> Dear All,
>
> I've read these two drafts with interest. In light of the discussion on
> the LSR WG list, I've been thinking about the scenarios where IFIT is bei=
ng
> used.
>
> draft-song-opsawg-ifit-framework defines the overall IFIT architecture
> that, as I understand it, applicable to different methods of collecting a=
nd
> transporting telemetry
> information. draft-wang-lsr-ifit-node-capability-advertisement is based o=
n
> the view that IFIT is a node-wide capability advertised as a binary flag
> for each listed method of collecting telemetry information (Option-Type
> enabled Flag). On-path telemetry collection is performed in the fast path=
,
> i.e., at a link layer. But a node might include ports with different
> capabilities. How such a heterogeneous, IFIT-wise, node will advertise IF=
IT
> Capability? To better use available resources for telemetry information
> collection, it might be helpful to advertise IFIT as a capability of a
> link, not of a node?
>
> What do you think?
>
>
>
> Regards,
>
> Greg
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>

--000000000000a3224d05a2a3d324
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>+1</div><div><br></div><div>IGP is NOT an AD scope ge=
neric L3 broadcast mechanism ;-)</div><div>BGP is NOT an world scope generi=
c L3 broadcast mechanism ;-)</div><div><br></div><div>--- tony <br></div></=
div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On=
 Mon, Apr 6, 2020 at 8:06 AM Les Ginsberg (ginsberg) &lt;ginsberg=3D<a href=
=3D"mailto:40cisco.com@dmarc.ietf.org">40cisco.com@dmarc.ietf.org</a>&gt; w=
rote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0p=
x 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">





<div lang=3D"EN-US">
<div class=3D"gmail-m_5969625407361348452WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif">This discussion is interesting, but please do not ign=
ore the considerable feedback from multiple folks indicating that this adve=
rtisement does not belong in the IGP at all
 (regardless of scope).<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif">My opinion on that has not changed.<u></u><u></u></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif">Thanx.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif">=C2=A0=C2=A0 Les<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<div style=3D"border-color:currentcolor currentcolor currentcolor blue;bord=
er-style:none none none solid;border-width:medium medium medium 1.5pt;paddi=
ng:0in 0in 0in 4pt">
<div>
<div style=3D"border-color:rgb(225,225,225) currentcolor currentcolor;borde=
r-style:solid none none;border-width:1pt medium medium;padding:3pt 0in 0in"=
>
<p class=3D"MsoNormal"><b><span style=3D"font-size:11pt;font-family:&quot;C=
alibri&quot;,sans-serif">From:</span></b><span style=3D"font-size:11pt;font=
-family:&quot;Calibri&quot;,sans-serif"> Lsr &lt;<a href=3D"mailto:lsr-boun=
ces@ietf.org" target=3D"_blank">lsr-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Tianran Zhou<br>
<b>Sent:</b> Monday, April 06, 2020 7:48 AM<br>
<b>To:</b> Greg Mirsky &lt;<a href=3D"mailto:gregimirsky@gmail.com" target=
=3D"_blank">gregimirsky@gmail.com</a>&gt;; <a href=3D"mailto:draft-wang-lsr=
-ifit-node-capability-advertisement@ietf.org" target=3D"_blank">draft-wang-=
lsr-ifit-node-capability-advertisement@ietf.org</a>; <a href=3D"mailto:lsr@=
ietf.org" target=3D"_blank">lsr@ietf.org</a>; <a href=3D"mailto:draft-song-=
opsawg-ifit-framework@ietf.org" target=3D"_blank">draft-song-opsawg-ifit-fr=
amework@ietf.org</a>; <a href=3D"mailto:opsawg@ietf.org" target=3D"_blank">=
opsawg@ietf.org</a><br>
<b>Subject:</b> Re: [Lsr] I,Scope of FIT Capability: a node or a link?<u></=
u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">Hi Greg,<u></u><u></u></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">Thanks very much for your inte=
rest on both IFIT framework and IFIT capability draft. And thanks for your =
review comments.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">Your perspective on both draft=
s are correct.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">On the node or link capability=
, thanks for your suggestion.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">I agree with both you and Jeff=
. The link capability can make the information more clear and accurate for =
different scenarios.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">Why we only considered the nod=
e capability? That=E2=80=99s the trade off to reduce complexity. We just wa=
nt to start from simple cases.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">If the WG think link capabilit=
y is necessary, we would like to add link capabilities to the update.<u></u=
><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">Cheers,<u></u><u></u></span></=
p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)">Tianran<u></u><u></u></span></=
p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p=
>
<p class=3D"MsoNormal"><b><span style=3D"font-size:11pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif" lang=3D"ZH-CN">=E5=8F=91=E4=BB=B6=E4=BA=BA=
</span></b><b><span style=3D"font-size:11pt;font-family:&quot;Microsoft YaH=
ei&quot;,sans-serif">:</span></b><span style=3D"font-size:11pt;font-family:=
&quot;Microsoft YaHei&quot;,sans-serif">
 Greg Mirsky [<a href=3D"mailto:gregimirsky@gmail.com" target=3D"_blank">ma=
ilto:gregimirsky@gmail.com</a>]
<br>
<b><span lang=3D"ZH-CN">=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4</span>:</b> 20=
20<span lang=3D"ZH-CN">=E5=B9=B4</span>4<span lang=3D"ZH-CN">=E6=9C=88</spa=
n>5<span lang=3D"ZH-CN">=E6=97=A5</span> 10:33<br>
<b><span lang=3D"ZH-CN">=E6=94=B6=E4=BB=B6=E4=BA=BA</span>:</b> <a href=3D"=
mailto:draft-wang-lsr-ifit-node-capability-advertisement@ietf.org" target=
=3D"_blank">
draft-wang-lsr-ifit-node-capability-advertisement@ietf.org</a>; <a href=3D"=
mailto:lsr@ietf.org" target=3D"_blank">
lsr@ietf.org</a>; <a href=3D"mailto:draft-song-opsawg-ifit-framework@ietf.o=
rg" target=3D"_blank">draft-song-opsawg-ifit-framework@ietf.org</a>;
<a href=3D"mailto:opsawg@ietf.org" target=3D"_blank">opsawg@ietf.org</a><br=
>
<b><span lang=3D"ZH-CN">=E4=B8=BB=E9=A2=98</span>:</b> I,Scope of FIT Capab=
ility: a node or a link?<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span><u></u>=C2=A0<u></u></span></p>
<div>
<p class=3D"MsoNormal"><span>Dear All,<u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal"><span>I&#39;ve read these two drafts with interest. =
In light=C2=A0of the discussion on the LSR WG list, I&#39;ve been thinking =
about the scenarios where IFIT is being used.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>draft-song-opsawg-ifit-framework defines the o=
verall IFIT architecture that, as I understand it, applicable to different =
methods of collecting and transporting telemetry information.=C2=A0draft-wa=
ng-lsr-ifit-node-capability-advertisement
 is based on the view=C2=A0that IFIT is a node-wide capability advertised a=
s a binary flag for each listed method of collecting telemetry information =
(Option-Type enabled Flag). On-path telemetry collection is performed in th=
e fast path, i.e., at a link layer. But
 a node might include ports with different capabilities. How such a heterog=
eneous, IFIT-wise, node will advertise IFIT Capability? To better=C2=A0use =
available resources for telemetry information collection, it=C2=A0might be =
helpful to advertise IFIT as a capability
 of a link, not of a node?<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>What do you=C2=A0think?<u></u><u></u></span></=
p>
</div>
<div>
<p class=3D"MsoNormal"><span><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>Regards,<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span>Greg<u></u><u></u></span></p>
</div>
</div>
</div>
</div>
</div>

_______________________________________________<br>
Lsr mailing list<br>
<a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
</blockquote></div>

--000000000000a3224d05a2a3d324--


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--_000_0eaa0f3d69d840b1be86c5717d70c67ehuaweicom_--


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From: Tianran Zhou <zhoutianran@huawei.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, Jeff Tantsura <jefftant.ietf@gmail.com>, "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>, Tony Li <tony1athome@gmail.com>
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Thread-Topic: [Lsr] I,Scope of FIT Capability: a node or a link?
Thread-Index: AdYMrIUGWe8h8bS0Rki6HVv232b2lQ==
Date: Tue, 7 Apr 2020 07:22:39 +0000
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Subject: Re: [Lsr] I,Scope of FIT Capability: a node or a link?
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From: "Acee Lindem (acee)" <acee@cisco.com>
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From: "Acee Lindem (acee)" <acee@cisco.com>
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Tianran Zhou <zhoutianran@huawei.com>, Jeff Tantsura <jefftant.ietf@gmail.com>, "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>, Tony Li <tony1athome@gmail.com>
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Thread-Topic: [Lsr] I,Scope of FIT Capability: a node or a link?
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Subject: Re: [Lsr] I,Scope of FIT Capability: a node or a link?
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Tianran Zhou <zhoutianran@huawei.com>, Jeff Tantsura <jefftant.ietf@gmail.com>, "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>, Tony Li <tony1athome@gmail.com>
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Thread-Topic: [Lsr] I,Scope of FIT Capability: a node or a link?
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Date: Tue, 7 Apr 2020 20:28:38 +0000
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Subject: Re: [Lsr] I,Scope of FIT Capability: a node or a link?
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From: Tianran Zhou <zhoutianran@huawei.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, Jeff Tantsura <jefftant.ietf@gmail.com>, "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>, Tony Li <tony1athome@gmail.com>
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Thread-Topic: [Lsr] I,Scope of FIT Capability: a node or a link?
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Date: Wed, 8 Apr 2020 06:35:07 +0000
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Subject: Re: [Lsr] I,Scope of FIT Capability: a node or a link?
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From: Tianran Zhou <zhoutianran@huawei.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, Jeff Tantsura <jefftant.ietf@gmail.com>, "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>, Tony Li <tony1athome@gmail.com>
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Thread-Topic: [Lsr] I,Scope of FIT Capability: a node or a link?
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Date: Wed, 8 Apr 2020 06:51:15 +0000
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Subject: Re: [Lsr] I,Scope of FIT Capability: a node or a link?
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Thread-Topic: [Lsr] I,Scope of FIT Capability: a node or a link?
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Subject: Re: [Lsr] I,Scope of FIT Capability: a node or a link?
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From: Tianran Zhou <zhoutianran@huawei.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, Jeff Tantsura <jefftant.ietf@gmail.com>, "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>, Tony Li <tony1athome@gmail.com>
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Thread-Topic: [Lsr] I,Scope of FIT Capability: a node or a link?
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Date: Thu, 9 Apr 2020 02:13:04 +0000
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Subject: Re: [Lsr] I,Scope of FIT Capability: a node or a link?
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A new Request for Comments is now available in online RFC libraries.

        
        RFC 8770

        Title:      Host Router Support for OSPFv2 
        Author:     K. Patel, 
                    P. Pillay-Esnault,
                    M. Bhardwaj,
                    S. Bayraktar
        Status:     Standards Track
        Stream:     IETF
        Date:       April 2020
        Mailbox:    keyur@arrcus.com, 
                    padma.ietf@gmail.com, 
                    manbhard@cisco.com,
                    serpil@cisco.com
        Pages:      8
        Updates:    RFC 6987

        I-D Tag:    draft-ietf-ospf-ospfv2-hbit-12.txt

        URL:        https://www.rfc-editor.org/info/rfc8770

        DOI:        10.17487/RFC8770

The Open Shortest Path First Version 2 (OSPFv2) protocol does not
have a mechanism for a node to repel transit traffic if it is on the
shortest path.  This document defines a bit called the Host-bit
(H-bit). This bit enables a router to advertise that it is a
non-transit router.  This document also describes the changes needed
to support the H-bit in the domain.  In addition, this document
updates RFC 6987 to advertise Type 2 External and Not-So-Stubby Area
(NSSA) Link State Advertisements (LSAs) (RFC 3101) with a high cost
in order to repel traffic effectively.

This document is a product of the Link State Routing Working Group of the IETF.

This is now a Proposed Standard.

STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements.  Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the 
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Thread-Topic: [Lsr] RFC 8770 on Host Router Support for OSPFv2
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Subject: Re: [Lsr] RFC 8770 on Host Router Support for OSPFv2
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From: Derek Yeung <derek@arrcus.com>
To: Peter Psenak <ppsenak=40cisco.com@dmarc.ietf.org>, Chris Bowers <chrisbowers.ietf@gmail.com>
CC: "lsr@ietf.org" <lsr@ietf.org>, SPRING WG List <spring@ietf.org>, "Ketan Talaulikar (ketant)" <ketant@cisco.com>, Bruno Decraene <bruno.decraene@orange.com>
Thread-Topic: [Lsr] clarification of locator block and locator node in draft-ietf-spring-srv6-network-programming and draft-ietf-lsr-isis-srv6-extensions
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/W-loDCsCo5apeURqSqD9_kBuJrI>
Subject: Re: [Lsr] clarification of locator block and locator node in draft-ietf-spring-srv6-network-programming and draft-ietf-lsr-isis-srv6-extensions
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From: "Weiqiang Cheng" <chengweiqiang@chinamobile.com>
To: "'Gengxuesong \(Geng Xuesong\)'" <gengxuesong@huawei.com>, "'Peter Psenak'" <ppsenak=40cisco.com@dmarc.ietf.org>, "'Chris Bowers'" <chrisbowers.ietf@gmail.com>
Cc: <lsr@ietf.org>, "'SPRING WG List'" <spring@ietf.org>, "'Ketan Talaulikar \(ketant\)'" <ketant@cisco.com>, "'Bruno Decraene'" <bruno.decraene@orange.com>
References: <CAHzoHbtmJGB8QY==A5EMzzSwh+8bQjhbVgPBjA3kHJGxpCD_zA@mail.gmail.com> <MW3PR11MB4570EDAE9E6AF17C9CCC9899C1E80@MW3PR11MB4570.namprd11.prod.outlook.com> <7453_1582899837_5E59227C_7453_80_1_53C29892C857584299CBF5D05346208A48DD14BA@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <CAHzoHbu4k15xJ2mnwp=9Xa400gQBtBY=OaSh6sh3_8E_t30sdA@mail.gmail.com> <MW3PR11MB4570E85308182AEA3D9E1BDBC1E50@MW3PR11MB4570.namprd11.prod.outlook.com> <CAHzoHbu3tNPv+=Fs-4o-PKxXhjt6tBReiyuyGVvFpdaVuJvqSA@mail.gmail.com> <MW3PR11MB457046873C2D009073459CCBC1FD0@MW3PR11MB4570.namprd11.prod.outlook.com> <CAHzoHbumzM76CFZCp+ec_OHvo+NCbMRRhtx7evGuw=DrZk1rZA@mail.gmail.com> <4bf64ede-c20b-2269-af11-1dffc5328935@cisco.com> <CAHzoHbv3k2Thri-hx=FYOYFXEgqDXQagLzJjC8XQ2btgYgey0Q@mail.gmail.com> <84b355a9-d3ce-af0e-ae60-f765aab4ec63@cisco.com> <CAHzoHbsdkd7p2RdyZ2Y3_e1XTLTn=zt+GKbmGYmaAYjsNC=hNg@mail.gmail.com> <b5d0a98a-28e4-13c1-961f-fa93eb5c09af@cisco.com> <0eaa0f3d69d840b1be86c5717d70c67e@huawei.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/0SkHHypPpW592nGktkNus8V55oo>
Subject: Re: [Lsr] [spring] clarification of locator block and locator node in draft-ietf-spring-srv6-network-programming and draft-ietf-lsr-isis-srv6-extensions
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Hi Xuesong,

I agree with Xuesong.=20

It has been in the draft for quite some time and is useful.=20

I do not see any issues with the proposed encodings for the SID =
Structure sub-TLV in the draft.

=20

B.R.

Weiqiang Cheng

=20

=E5=8F=91=E4=BB=B6=E4=BA=BA: spring [mailto:spring-bounces@ietf.org] =
=E4=BB=A3=E8=A1=A8 Gengxuesong (Geng Xuesong)
=E5=8F=91=E9=80=81=E6=97=B6=E9=97=B4: 2020=E5=B9=B44=E6=9C=887=E6=97=A5 =
10:56
=E6=94=B6=E4=BB=B6=E4=BA=BA: Peter Psenak; Chris Bowers
=E6=8A=84=E9=80=81: lsr@ietf.org; SPRING WG List; Ketan Talaulikar =
(ketant); Bruno Decraene
=E4=B8=BB=E9=A2=98: Re: [spring] [Lsr] clarification of locator block =
and locator node in draft-ietf-spring-srv6-network-programming and =
draft-ietf-lsr-isis-srv6-extensions

=20

Hi Chris, Peter,

=20

Here are some personal opinions about this discussion:

-            Keep LBL and LNL in the structure sub-TLV is better for =
protocol scalability and flexibility, an operator could choose to =
allocate SRv6 locator from the same locator block, or from different =
locator block.

-            It is suggested to design SID structure sub-TLV as a =
general TLV which could be used for BGP/BGP-LS/ISIS/OSPF.=20

-            SID is supposed to be advertised with suitable protocol =
based on the use case. Whether it contains argument or not is not =
relevant.

=20

B.R.

Xuesong

=20

-----Original Message-----
From: spring [mailto:spring-bounces@ietf.org] On Behalf Of Peter Psenak
Sent: Monday, April 6, 2020 7:03 PM
To: Chris Bowers <chrisbowers.ietf@gmail.com>
Cc: lsr@ietf.org; SPRING WG List <spring@ietf.org>; Ketan Talaulikar =
(ketant) <ketant@cisco.com>; Bruno Decraene <bruno.decraene@orange.com>
Subject: Re: [spring] [Lsr] clarification of locator block and locator =
node in draft-ietf-spring-srv6-network-programming and =
draft-ietf-lsr-isis-srv6-extensions

=20

Chris,

=20

On 01/04/2020 21:58, Chris Bowers wrote:

> Peter,

>=20

> There seem to be two disconnects in this discussion.

>=20

> 1) The response below implies that the encodings in=20

> draft-ietf-lsr-isis-srv6-extensions are supposed represent the case=20

> where the locators are allocated from several different IPv6 address=20

> blocks (for example, blocks S1/s1 through Sn/sn). However,=20

> draft-ietf-spring-srv6-network-programming and=20

> draft-ietf-6man-segment-routing-header only discuss the case where the =


> locators are allocated from a single block (S/s).  If an=20

> implementation is expected to properly encode the case where locators=20

> are allocated from several different IPv6 address blocks, then I think =


> that case should be explicitly described in these documents.

=20

=20

There is no statement in draft-ietf-spring-srv6-network-programming that =
the block is unique. As an example, Iliad authorized me to indicate that =
their SRv6 deployment involves several blocks.

=20

>=20

> 2)   The response below says "To be able to find out where the func=20

> and arg are located, you need to know the LOC length, e.g. Block and=20

> Node length."  However, the SRv6 SID Structure Sub-Sub-TLV is carried=20

> within the SRv6 End SID, SRv6 End.X SID, and the SRv6 LAN End.X SID=20

> Sub-TLVs, which are carried within the SRv6 Locator TLV.

=20

not really. SRv6 End.X SID, and the SRv6 LAN End.X SID Sub-TLVs are =
advertised in the IS Reachability TLVs (22, 23, 222, 223, 141), not in

SRv6 Locator TLV.

=20

thanks,

Peter

=20

=20

> The  SRv6 Locator TLV

> has a Loc-Size field.  Why would the value of the LOC length computed=20

> as the sum of the Block and Node length ever be different from the=20

> value in the Loc-Size field?

>=20

> Chris

>=20

>=20

> On Wed, Mar 25, 2020 at 9:49 AM Peter Psenak <ppsenak@cisco.com=20

> < <mailto:ppsenak@cisco.com> mailto:ppsenak@cisco.com>> wrote:

>=20

>     Chris,

>=20

>     please see inline:

>=20

>=20

>     On 23/03/2020 17:39, Chris Bowers wrote:

>      > Peter,

>      >

>      > The proposed SRv6 SID Structure Sub-Sub-TLV has several =
problems.

>      >

>      > 1) As discussed in item#3 below, it is not clear that flooding =
LB

>      > Length, LN Length, Fun. Length, and Arg. Length to all ISIS

>     speakers is

>      > really the right approach.  However, if the WG determines that =
it

>     is the

>      > right approach, the current encodings of this information in =
the

>      > proposed SRv6 SID Structure Sub-Sub-TLV are problematic.  As

>     discussed

>      > earlier in this thread, a network operator may choose to not

>     allocate

>      > all locators from a single block, so LB Length and LN Length =
may

>     not be

>      > well-defined.

>=20

>     I'm not sure what do you mean by not "well defined". For every SID =
you

>     need to know the LOC (B+N) part. If you guarantee that it is the

>     same on

>     all nodes, you know it from the local config, otherwise, you =
advertise

>     it with a SID.

>=20

>      > The current encoding of the SRv6 SID Structure

>      > Sub-Sub-TLV makes it difficult to represent this situation.  =
The

>     simple

>      > thing to do for nodes that don't have a well-defined value of =
LB

>     Length

>      > and LN Length would be to not advertise a value for LB Length =
and LN

>      > Length.  However, since the currently proposed SRv6 SID =
Structure

>      > Sub-Sub-TLV combines LB Length, LN Length, Fun. Length, and =
Arg.

>     Length

>      > into a single sub-sub-TLV, if a node wants to advertise values

>     for Fun.

>      > Length and Arg. Length, it also has to advertise values for LB

>     Length

>      > and LN Length.  It seems like a better approach would be to =
have

>      > different sub-sub-TLVs, one for  LB Length and LN Length, and a

>     separate

>      > one for Fun. Length and Arg. Length to be able to better

>     represent this

>      > situation.

>=20

>=20

>     I'm afraid you are missing an important point.

>=20

>     SRv6 SID is defined as LOC:FUNCT:ARG, where LOC is represented as =
B:N.

>     To be able to find out where the func and arg are located, you =
need to

>     know the LOC length, e.g. Block and Node length. Advertising just =
Func

>     and Arg length does not help.

>=20

>=20

>      >

>      > 2) Now consider the situation where a network operator chooses =
to

>      > allocate all locators from a single block, so that LB Length =
and LN

>      > Length are well-defined across the network.  A given node =
should

>      > presumably advertise its own understanding of LB Length and LN

>     Length.

>      > A given node's understanding of LB Length and LN Length is a

>     property of

>      > the node.  It is not a property of a given End SID.  The =
currently

>      > proposed SRv6 SID Structure Sub-Sub-TLV however is carried =
within

>     each

>      > End SID Sub-TLV.  With the currently proposed encoding,

>     presumably an

>      > implementation is expected to send the exact same values of LB

>     Length

>      > and LN Length for all of the End SIDs that it advertises.  Not

>     only is

>      > this inefficient, but it creates the need for logic to decide

>     what to do

>      > when different End SIDs advertised by the same node carry =
different

>      > values of LB Length and LN Length in their sub-sub-TLVs.  It

>     seems like

>      > a better approach would be for a given node to advertise its

>      > understanding of the value of LB Length and LN Length in a

>     sub-TLV of

>      > the Router Capability TLV.

>=20

>     When we design the encoding, we have to define it such, that it

>     supports

>     all possible use cases. We can not design the encoding that works =
for

>     single use case (allocate all locators from a single block) and =
does

>     not

>     work for others - different block from different node, multiple =
blocks

>     on a single node (e.g. border node), which are all valid.

>=20

>      >

>      > 3) At this point, the only use case that has been proposed for

>     flooding

>      > the LB Length, LN Length, Fun. Length, and Arg. Length to all =
ISIS

>      > speakers is to make it more convenient for BGP-LS to get those

>     values to

>      > an external controller as part of a topology feed from any ISIS

>     node.

>      > No use case has been proposed for ISIS speakers themselves to

>     make use

>      > of the information.  It seems like a more scalable approach =
would

>     be to

>      > use BGP-LS sessions to collect the information from the subset =
of

>     nodes

>      > that actually produce the relevant information.  So far there =
are

>     no End

>      > SIDs defined that are advertised in ISIS that have a non-zero =
Arg.

>      > Length.  If an End SID with non-zero Arg. Length were to be

>     proposed in

>      > the future as needing to be flooded to all ISIS nodes, it seems

>     likely

>      > that the new End SID would also be advertised using the BGP

>     IP/VPN/EVPN

>      > control plane.   So it seems like a viable alternative for this

>      > hypothetical future End SID would be to have the subset of =
nodes

>     that

>      > have non-zero Arg. Length values communicate to an external

>     controller

>      > via  BGP sessions. I think the WG needs a more detailed

>     discussion of a

>      > concrete use case in order to determine whether flooding LB

>     Length, LN

>      > Length, Fun. Length, and Arg. Length to all ISIS speakers is

>     really the

>      > right approach.

>=20

>     there are networks, where BGP is not deployed on all nodes, only =
on a

>     few nodes that re-distribute the information to BGP-LS. In such =
case we

>     need the IGP to distribute this data.

>=20

>     Argument that "it seems likely that the new End SID would also be

>     advertised using the BGP IP/VPN/EVPN" is a wishful thinking that =
we can

>     not based our encoding on.

>=20

>=20

>      >

>      > Given the lack of a compelling use case for flooding LB Length, =
LN

>      > Length, Fun. Length, and Arg. Length to all ISIS speakers and =
the

>      > problems with the currently proposed encodings for doing that, =
I

>     think

>      > that the SRv6 SID Structure Sub-Sub-TLV should be removed from

>      > draft-ietf-lsr-isis-srv6-extensions. A mechanism for flooding =
LB

>     Length,

>      > LN Length, Fun. Length, and Arg. Length to all ISIS speakers =
can be

>      > defined in a future document.

>=20

>     The security use case has already been pointed out earlier in this

>     thread:

>=20

>    =20

>  =
<https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26> =
https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#

> section-5

>=20

>     Given the arguments I mentioned above, I respectfully disagree =
with the

>     removal of the SID Structure Sub-Sub-TLV from the ISIS SRv6 draft.

>=20

>     thanks,

>     Peter

>=20

>=20

>      >

>      > Thanks,

>      > Chris

>      >

>      > On Fri, Mar 13, 2020 at 5:02 AM Peter Psenak <ppsenak@cisco.com

>     < <mailto:ppsenak@cisco.com> mailto:ppsenak@cisco.com>

>      > < <mailto:ppsenak@cisco.com%20%3cmailto:ppsenak@cisco.com> =
mailto:ppsenak@cisco.com <mailto:ppsenak@cisco.com>>> wrote:

>      >

>      >     Hi Chris,

>      >

>      >     On 12/03/2020 15:58, Chris Bowers wrote:

>      >      > Peter,

>      >      >

>      >      > I think that the SRv6 SID Structure Sub-Sub-TLV should =
be

>     removed

>      >     from

>      >      > draft-ietf-lsr-isis-srv6-extensions.  I think that we =
should

>      >     leave the

>      >      > ability to include sub-sub-TLVs in the SRv6 End SID =
Sub-TLV,

>      >     End.X SID

>      >      > Sub-TLV, and LAN End.X SID Sub-TLV in the encodings for =
those

>      >     sub-TLVs.

>      >      >

>      >      > I don't think that the current text describing the SRv6 =
SID

>      >     Structure

>      >      > Sub-Sub-TLV would result in interoperable

>     implementations.  Based

>      >     on the

>      >

>      >     SRv6 base spec defines SID B, L, A, F.

>      >

>      >     SRv6 protocol specs are advertising these values with the

>     SRv6 SID,

>      >     they

>      >     don't use them. The usage is outside of the scope of the =
protocol

>      >     drafts. What exactly is the problem?

>      >

>      >     thanks,

>      >     Peter

>      >

>      >

>      >      > discussion with Ketan below, it appears that use cases =
for

>     ISIS

>      >     speakers

>      >      > receiving advertised values of LB Length, LN Length, =
Fun.

>     Length,

>      >     and

>      >      > Arg. Length are not currently well-defined.    So I =
think it

>      >     makes sense

>      >      > to defer the definition of the SRv6 SID Structure

>     Sub-Sub-TLV to a

>      >      > future document.

>      >      >

>      >      > Thanks,

>      >      > Chris

>      >      >

>      >      > On Thu, Mar 12, 2020 at 6:02 AM Ketan Talaulikar =
(ketant)

>      >      > < <mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com> =
ketant@cisco.com <mailto:ketant@cisco.com>

>     < <mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com> =
mailto:ketant@cisco.com <mailto:ketant@cisco.com>>

>      >     < <mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com> =
mailto:ketant@cisco.com <mailto:ketant@cisco.com>

>     < <mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com> =
mailto:ketant@cisco.com <mailto:ketant@cisco.com>>>> wrote:

>      >      >

>      >      >     Hi Chris,____

>      >      >

>      >      >     __ __

>      >      >

>      >      >     Dropping the

>     draft-ietf-spring-srv6-network-programming authors

>      >      >     since we are now back to discussing the ISIS

>     extensions.____

>      >      >

>      >      >     __ __

>      >      >

>      >      >     Please check inline below.____

>      >      >

>      >      >     __ __

>      >      >

>      >      >     *From:*Chris Bowers <chrisbowers.ietf@gmail.com

>     < <mailto:chrisbowers.ietf@gmail.com> =
mailto:chrisbowers.ietf@gmail.com>

>      >     <mailto:chrisbowers.ietf@gmail.com

>     < <mailto:chrisbowers.ietf@gmail.com> =
mailto:chrisbowers.ietf@gmail.com>>

>      >      >     <mailto:chrisbowers.ietf@gmail.com

>     < <mailto:chrisbowers.ietf@gmail.com> =
mailto:chrisbowers.ietf@gmail.com>

>      >     <mailto:chrisbowers.ietf@gmail.com

>     < <mailto:chrisbowers.ietf@gmail.com> =
mailto:chrisbowers.ietf@gmail.com>>>>

>      >      >     *Sent:* 05 March 2020 21:53

>      >      >     *To:* Ketan Talaulikar (ketant) <ketant@cisco.com

>     < <mailto:ketant@cisco.com> mailto:ketant@cisco.com>

>      >     < <mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com> =
mailto:ketant@cisco.com <mailto:ketant@cisco.com>>

>      >      >     < =
<mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com> =
mailto:ketant@cisco.com <mailto:ketant@cisco.com>

>     < <mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com> =
mailto:ketant@cisco.com <mailto:ketant@cisco.com>>>>

>      >      >     *Cc:* Ketan Talaulikar (ketant) <ketant@cisco.com

>     < <mailto:ketant@cisco.com> mailto:ketant@cisco.com>

>      >     < <mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com> =
mailto:ketant@cisco.com <mailto:ketant@cisco.com>>

>      >      >     < =
<mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com> =
mailto:ketant@cisco.com <mailto:ketant@cisco.com>

>     < <mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com> =
mailto:ketant@cisco.com <mailto:ketant@cisco.com>>>>;

>      >  <mailto:lsr@ietf.org> lsr@ietf.org < <mailto:lsr@ietf.org> =
mailto:lsr@ietf.org> <mailto:lsr@ietf.org

>     < <mailto:lsr@ietf.org> mailto:lsr@ietf.org>> < =
<mailto:lsr@ietf.org%20%3cmailto:lsr@ietf.org> mailto:lsr@ietf.org =
<mailto:lsr@ietf.org>

>      >     < <mailto:lsr@ietf.org%20%3cmailto:lsr@ietf.org> =
mailto:lsr@ietf.org <mailto:lsr@ietf.org>>>;

>      >      >     SPRING WG List <spring@ietf.org

>     < <mailto:spring@ietf.org> mailto:spring@ietf.org> =
<mailto:spring@ietf.org

>     < <mailto:spring@ietf.org> mailto:spring@ietf.org>>

>      >     < <mailto:spring@ietf.org%20%3cmailto:spring@ietf.org> =
mailto:spring@ietf.org <mailto:spring@ietf.org>

>     < <mailto:spring@ietf.org%20%3cmailto:spring@ietf.org> =
mailto:spring@ietf.org <mailto:spring@ietf.org>>>>;

>      >      >     draft-ietf-spring-srv6-network-programming

>      >      >     <draft-ietf-spring-srv6-network-programming@ietf.org

>     < <mailto:draft-ietf-spring-srv6-network-programming@ietf.org> =
mailto:draft-ietf-spring-srv6-network-programming@ietf.org>

>      >     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org

>     < <mailto:draft-ietf-spring-srv6-network-programming@ietf.org> =
mailto:draft-ietf-spring-srv6-network-programming@ietf.org>>

>      >      >  =20

>       <mailto:draft-ietf-spring-srv6-network-programming@ietf.org

>     < <mailto:draft-ietf-spring-srv6-network-programming@ietf.org> =
mailto:draft-ietf-spring-srv6-network-programming@ietf.org>

>      >     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org

>     < <mailto:draft-ietf-spring-srv6-network-programming@ietf.org> =
mailto:draft-ietf-spring-srv6-network-programming@ietf.org>>>>; Peter

>      >      >     Psenak (ppsenak) <ppsenak@cisco.com

>     < <mailto:ppsenak@cisco.com> mailto:ppsenak@cisco.com>

>      >     < <mailto:ppsenak@cisco.com%20%3cmailto:ppsenak@cisco.com> =
mailto:ppsenak@cisco.com <mailto:ppsenak@cisco.com>>

>     < <mailto:ppsenak@cisco.com%20%3cmailto:ppsenak@cisco.com> =
mailto:ppsenak@cisco.com <mailto:ppsenak@cisco.com>

>      >     < <mailto:ppsenak@cisco.com%20%3cmailto:ppsenak@cisco.com> =
mailto:ppsenak@cisco.com <mailto:ppsenak@cisco.com>>>>;

>      >      >     Bruno Decraene <bruno.decraene@orange.com

>     < <mailto:bruno.decraene@orange.com> =
mailto:bruno.decraene@orange.com>

>      >     <mailto:bruno.decraene@orange.com

>     < <mailto:bruno.decraene@orange.com> =
mailto:bruno.decraene@orange.com>>

>      >      >     <mailto:bruno.decraene@orange.com

>     < <mailto:bruno.decraene@orange.com> =
mailto:bruno.decraene@orange.com>

>      >     <mailto:bruno.decraene@orange.com

>     < <mailto:bruno.decraene@orange.com> =
mailto:bruno.decraene@orange.com>>>>

>      >      >     *Subject:* Re: [Lsr] clarification of locator block =
and

>      >     locator node

>      >      >     in draft-ietf-spring-srv6-network-programming and

>      >      >     draft-ietf-lsr-isis-srv6-extensions____

>      >      >

>      >      >     __ __

>      >      >

>      >      >     Ketan,____

>      >      >

>      >      >     __ __

>      >      >

>      >      >     See inline [CB].____

>      >      >

>      >      >     __ __

>      >      >

>      >      >     On Wed, Mar 4, 2020 at 12:36 AM Ketan Talaulikar =
(ketant)

>      >      >     < =
<mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com> ketant@cisco.com =
<mailto:ketant@cisco.com>

>     < <mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com> =
mailto:ketant@cisco.com <mailto:ketant@cisco.com>>

>      >     < <mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com> =
mailto:ketant@cisco.com <mailto:ketant@cisco.com>

>     < <mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com> =
mailto:ketant@cisco.com <mailto:ketant@cisco.com>>>> wrote:____

>      >      >

>      >      >         Hi Chris,____

>      >      >

>      >      >         ____

>      >      >

>      >      >         You are right in that there is no assumption =
that

>     all SRv6

>      >      >         locators in a domain are allocated from the same

>     block.

>      >      >         Therefore knowing the blocks used in the domain =
is

>      >     useful.____

>      >      >

>      >      >     ____

>      >      >

>      >      >     [CB] Since you refer to "blocks" (plural) in this

>     sentence,

>      >     are you

>      >      >     saying that in the scenario where all SRv6 locators =
in a

>      >     domain are

>      >      >     not allocated from the same block, you would expect

>     different

>      >      >     routers in the same domain to advertise different

>     values of B

>      >     and N?

>      >      >     ____

>      >      >

>      >      >     */[KT] While personally I believe it would not be =
the

>     usual

>      >     case, it

>      >      >     is left to the operator.____/*

>      >      >

>      >      >     */__ __/*

>      >      >

>      >      >     For example, assume we have a network where all SRv6

>     locators

>      >     in a

>      >      >     domain are not allocated from the same block.  =
Router A

>      >     advertises

>      >      >     an SRv6 Locator TLV with locator =3D 2000::/64, and =
an

>     SRv6 End SID

>      >      >     sub-TLV with some endpoint behavior. Router B

>     advertises an SRv6

>      >      >     Locator TLV with locator =3D 3000::/64, and an SRv6 =
End

>     SID sub-TLV

>      >      >     with some endpoint behavior. What should routers A =
and B

>      >     advertise

>      >      >     as the values of B and N in their SRv6 SID Structure

>      >     Sub-Sub-TLVs ?____

>      >      >

>      >      >     */[KT] It is difficult for me to figure out what the =
block

>      >     and node

>      >      >     parts are with such an addressing./*____

>      >      >

>      >      >     ____

>      >      >

>      >      >         ____

>      >      >

>      >      >         The IGP drafts covers the advertisement of the B =
and N

>      >     parts of

>      >      >         the locally configured locator on the node via

>     IGPs. On the

>      >      >         receiver side, the IGP may not really do much =
with

>     this

>      >      >         information, however it enables propagation of =
this

>      >     information

>      >      >         from all nodes in the network to be advertised =
out

>     via BGP-LS

>      >      >         (or other mechanisms) as part of the topology

>     feed. Once

>      >     this is

>      >      >         part of the topology feed, it enables use-cases =
on

>      >     controllers

>      >      >         to perform network wide validation of the SRv6 =
SID

>     block

>      >      >         provisioning and can also help in automation of

>     the security

>      >      >         aspects described in

>      >      >

>      >

>      =
<https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#se=
ction-5____> =
https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#sec=
tion-5____

>      >      >

>      >      >         ____

>      >      >

>      >      >     [CB] If an ISIS speaker is not expected to do =
anything

>     with B

>      >     and N,

>      >      >     then I think the text in

>     draft-ietf-lsr-isis-srv6-extensions

>      >     needs

>      >      >     to clarify this.  I have a similar observation about =
Fun.

>      >     Length and

>      >      >     Arg. Length in the SRv6 SID Structure Sub-Sub-TLV .=20

>     As far

>      >     as I can

>      >      >     tell, none of the endpoint behaviors that are =
currently

>      >     specified to

>      >      >     be carried in ISIS End, End.X, and LAN End.X SIDs =
sub-TLVs

>      >     uses an

>      >      >     Argument, so there is never a case where an SRv6 SID

>     Structure

>      >      >     Sub-Sub-TLV should have a non-zero value for Arg.

>     Length. What

>      >      >     should an ISIS speaker do if it receives a non-zero

>     value of the

>      >      >     Arg. Length for an endpoint behavior that doesn't =
use an

>      >     argument?

>      >      >     Are there any use cases envisioned where an ISIS

>     speaker needs to

>      >      >     know the Arg. Length ? ____

>      >      >

>      >      >     */[KT] The behaviors currently listed in the draft =
do

>     not have an

>      >      >     argument nor is the use of B and N required for =
them.

>     We cannot

>      >      >     preclude a future use-case or extension where such

>     behaviors

>      >      >     introduced are also applicable to ISIS. So IMHO =
ruling

>     such

>      >     aspects

>      >      >     out might not be the right thing to do from a =
protocol

>      >     extensibility

>      >      >     perspective.____/*

>      >      >

>      >      >     */__ __/*

>      >      >

>      >      >     */Thanks,____/*

>      >      >

>      >      >     */Ketan/*____

>      >      >

>      >      >     __ __

>      >      >

>      >      >         Thanks,____

>      >      >

>      >      >         Ketan____

>      >      >

>      >      >         ____

>      >      >

>      >      >         *From:*Chris Bowers <chrisbowers.ietf@gmail.com

>     < <mailto:chrisbowers.ietf@gmail.com> =
mailto:chrisbowers.ietf@gmail.com>

>      >     <mailto:chrisbowers.ietf@gmail.com

>     < <mailto:chrisbowers.ietf@gmail.com> =
mailto:chrisbowers.ietf@gmail.com>>

>      >      >         <mailto:chrisbowers.ietf@gmail.com

>     < <mailto:chrisbowers.ietf@gmail.com> =
mailto:chrisbowers.ietf@gmail.com>

>      >     <mailto:chrisbowers.ietf@gmail.com

>     < <mailto:chrisbowers.ietf@gmail.com> =
mailto:chrisbowers.ietf@gmail.com>>>>

>      >      >         *Sent:* 02 March 2020 23:39

>      >      >         *To:* Ketan Talaulikar (ketant) =
<ketant@cisco.com

>     < <mailto:ketant@cisco.com> mailto:ketant@cisco.com>

>      >     < <mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com> =
mailto:ketant@cisco.com <mailto:ketant@cisco.com>>

>      >      >         < =
<mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com> =
mailto:ketant@cisco.com <mailto:ketant@cisco.com>

>     < <mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com> =
mailto:ketant@cisco.com <mailto:ketant@cisco.com>>>>

>      >      >         *Cc:* Ketan Talaulikar (ketant)

>      >      >         <ketant=3D40cisco.com@dmarc.ietf.org

>     < <mailto:40cisco.com@dmarc.ietf.org> =
mailto:40cisco.com@dmarc.ietf.org>

>      >     <mailto:40cisco.com@dmarc.ietf.org

>     < <mailto:40cisco.com@dmarc.ietf.org> =
mailto:40cisco.com@dmarc.ietf.org>>

>      >      >         <mailto:40cisco..com@dmarc.ietf.org

>     < <mailto:40cisco..com@dmarc.ietf.org> =
mailto:40cisco..com@dmarc.ietf.org>

>      >     <mailto:40cisco..com@dmarc.ietf.org

>     < <mailto:40cisco..com@dmarc.ietf.org> =
mailto:40cisco..com@dmarc.ietf.org>>>>;  <mailto:lsr@ietf.org> =
lsr@ietf.org

>     < <mailto:lsr@ietf.org> mailto:lsr@ietf.org>

>      >     < <mailto:lsr@ietf.org%20%3cmailto:lsr@ietf.org> =
mailto:lsr@ietf.org <mailto:lsr@ietf.org>>

>      >      >         < <mailto:lsr@ietf.org%20%3cmailto:lsr@ietf.org> =
mailto:lsr@ietf.org <mailto:lsr@ietf.org>

>     < <mailto:lsr@ietf.org%20%3cmailto:lsr@ietf.org> =
mailto:lsr@ietf.org <mailto:lsr@ietf.org>>>; SPRING WG

>      >     List < <mailto:spring@ietf.org%20%3cmailto:spring@ietf.org> =
spring@ietf.org <mailto:spring@ietf.org>

>     < <mailto:spring@ietf.org%20%3cmailto:spring@ietf.org> =
mailto:spring@ietf.org <mailto:spring@ietf.org>>

>      >      >         < =
<mailto:spring@ietf.org%20%3cmailto:spring@ietf.org> =
mailto:spring@ietf.org <mailto:spring@ietf.org>

>     < <mailto:spring@ietf.org%20%3cmailto:spring@ietf.org> =
mailto:spring@ietf.org <mailto:spring@ietf.org>>>>;

>      >      >         draft-ietf-spring-srv6-network-programming

>      >      >      =20

>       <draft-ietf-spring-srv6-network-programming@ietf.org

>     < <mailto:draft-ietf-spring-srv6-network-programming@ietf.org> =
mailto:draft-ietf-spring-srv6-network-programming@ietf.org>

>      >     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org

>     < <mailto:draft-ietf-spring-srv6-network-programming@ietf.org> =
mailto:draft-ietf-spring-srv6-network-programming@ietf.org>>

>      >      >

>      >       =
<mailto:draft-ietf-spring-srv6-network-programming@ietf.org

>     < <mailto:draft-ietf-spring-srv6-network-programming@ietf.org> =
mailto:draft-ietf-spring-srv6-network-programming@ietf.org>

>      >     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org

>     < <mailto:draft-ietf-spring-srv6-network-programming@ietf.org> =
mailto:draft-ietf-spring-srv6-network-programming@ietf.org>>>>;

>      >      >         Peter Psenak (ppsenak) <ppsenak@cisco.com

>     < <mailto:ppsenak@cisco.com> mailto:ppsenak@cisco.com>

>      >     < <mailto:ppsenak@cisco.com%20%3cmailto:ppsenak@cisco.com> =
mailto:ppsenak@cisco.com <mailto:ppsenak@cisco.com>>

>      >      >         <mailto:ppsenak@cisco.com

>     < <mailto:ppsenak@cisco.com> mailto:ppsenak@cisco.com> =
<mailto:ppsenak@cisco.com

>     < <mailto:ppsenak@cisco.com> mailto:ppsenak@cisco.com>>>>;

>      >     Bruno Decraene

>      >      >         <bruno.decraene@orange.com

>     < <mailto:bruno.decraene@orange.com> =
mailto:bruno.decraene@orange.com>

>      >     <mailto:bruno.decraene@orange.com

>     < <mailto:bruno.decraene@orange.com> =
mailto:bruno.decraene@orange.com>>

>     < =
<mailto:bruno.decraene@orange.com%20%3cmailto:bruno.decraene@orange.com> =
mailto:bruno.decraene@orange.com <mailto:bruno.decraene@orange.com>

>      >     <mailto:bruno.decraene@orange.com

>     < <mailto:bruno.decraene@orange.com> =
mailto:bruno.decraene@orange.com>>>>

>      >      >         *Subject:* Re: [Lsr] clarification of locator

>     block and

>      >     locator

>      >      >         node in =
draft-ietf-spring-srv6-network-programming and

>      >      >         draft-ietf-lsr-isis-srv6-extensions____

>      >      >

>      >      >         ____

>      >      >

>      >      >         Ketan,____

>      >      >

>      >      >         ____

>      >      >

>      >      >         Based on current documents, allocating all SRv6

>     locators

>      >     used in

>      >      >         a domain from a single block is optional.____

>      >      >

>      >      >         ____

>      >      >

>      >      >         However, assuming for the moment that a network

>     operator has

>      >      >         chosen to allocate all SRv6 locators used in a

>     domain from a

>      >      >         single block, so that there is a well-defined

>     value of B

>      >     and N

>      >      >         across a domain, what is the use of having a

>     router advertise

>      >      >         its own understanding of these two values?  And

>     what is a

>      >      >         receiver supposed to do with this =
information?____

>      >      >

>      >      >         ____

>      >      >

>      >      >         Thanks,____

>      >      >

>      >      >         Chris____

>      >      >

>      >      >         ____

>      >      >

>      >      >         On Fri, Feb 28, 2020 at 8:23 AM

>      >     < =
<mailto:bruno.decraene@orange.com%20%3cmailto:bruno.decraene@orange.com> =
bruno.decraene@orange.com <mailto:bruno.decraene@orange.com>

>     < =
<mailto:bruno.decraene@orange.com%20%3cmailto:bruno.decraene@orange.com> =
mailto:bruno.decraene@orange.com <mailto:bruno.decraene@orange.com>>

>      >      >         <mailto:bruno.decraene@orange.com

>     < <mailto:bruno.decraene@orange.com> =
mailto:bruno.decraene@orange.com>

>      >     <mailto:bruno.decraene@orange.com

>     < <mailto:bruno.decraene@orange.com> =
mailto:bruno.decraene@orange.com>>>> wrote:____

>      >      >

>      >      >             Hi Ketan,____

>      >      >

>      >      >             ____

>      >      >

>      >      >             Thanks fort the follow up.____

>      >      >

>      >      >             Clarification inline [Bruno]____

>      >      >

>      >      >             ____

>      >      >

>      >      >             *From**:*Ketan Talaulikar (ketant)

>      >     [mailto:ketant@cisco.com <mailto:ketant@cisco.com>

>     < <mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com> =
mailto:ketant@cisco.com <mailto:ketant@cisco.com>>

>      >      >             <mailto:ketant@cisco.com

>     < <mailto:ketant@cisco.com> mailto:ketant@cisco.com> =
<mailto:ketant@cisco.com

>     < <mailto:ketant@cisco.com> mailto:ketant@cisco.com>>>]

>      >      >             *Sent:* Friday, February 28, 2020 11:11 AM

>      >      >             *To:* DECRAENE Bruno TGI/OLN; Ketan =
Talaulikar

>     (ketant);

>      >      >             Chris Bowers

>      >      >             *Cc:*  <mailto:lsr@ietf.org> lsr@ietf.org < =
<mailto:lsr@ietf.org> mailto:lsr@ietf.org>

>     < <mailto:lsr@ietf.org%20%3cmailto:lsr@ietf.org> =
mailto:lsr@ietf.org <mailto:lsr@ietf.org>>

>      >     < <mailto:lsr@ietf.org%20%3cmailto:lsr@ietf.org> =
mailto:lsr@ietf.org <mailto:lsr@ietf.org>

>     < <mailto:lsr@ietf.org%20%3cmailto:lsr@ietf.org> =
mailto:lsr@ietf.org <mailto:lsr@ietf.org>>>; SPRING WG List;

>      >      >             draft-ietf-spring-srv6-network-programming;

>     Peter Psenak

>      >      >             (ppsenak)

>      >      >             *Subject:* RE: [Lsr] clarification of =
locator

>     block and

>      >      >             locator node in

>      >     draft-ietf-spring-srv6-network-programming

>      >      >             and draft-ietf-lsr-isis-srv6-extensions____

>      >      >

>      >      >             ____

>      >      >

>      >      >             Hi Bruno,____

>      >      >

>      >      >             ____

>      >      >

>      >      >             I believe the description and usage of =
Locator is

>      >     very well

>      >      >             described and covered in the net-pgm draft =
as

>     also the

>      >      >             corresponding IGP extensions. Is the =
question

>     is more

>      >     about

>      >      >             the =E2=80=9Cblock=E2=80=9D part of it (what =
is not in the

>     block part

>      >     is in

>      >      >             the node part as per the text in the net-pgm

>     draft)?____

>      >      >

>      >      >             ____

>      >      >

>      >      >             The =E2=80=9Cblock=E2=80=9D is again not a =
new thing. Please

>     check the

>      >      >             following:____

>      >      >

>      >      >             Under

>      >      >

>      >

>      =
<https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#se=
ction-5> =
https://tools.ietf.org/html/draft-ietf-6man-segment-routing-header-26#sec=
tion-5

>      >      >             =E2=80=A6 look for =
=E2=80=9Cblock=E2=80=9D____

>      >      >

>      >      >  <https://tools.ietf.org/html/rfc8402#section-2> =
https://tools.ietf.org/html/rfc8402#section-2 =E2=80=A6 look under

>      >      >             SRGB for SRv6____

>      >      >

>      >      >             ____

>      >      >

>      >      >             [Bruno]____

>      >      >

>      >      >             To clarify, my question was not specific to

>     =E2=80=9Cblock=E2=80=9D but

>      >      >             related to the usage, by the receiver, of =
the

>     following

>      >      >             piece of information:____

>      >      >

>      >      >             ____

>      >      >

>      >      >                    LB Length: SRv6 SID Locator Block

>     length____

>      >      >

>      >      >                    LN Length: SRv6 SID Locator Node =
length____

>      >      >

>      >      >                    Fun. Length: SRv6 SID Function =
length____

>      >      >

>      >      >                    Arg. Length: SRv6 SID Arguments =
length____

>      >      >

>      >      >             ____

>      >      >

>      >      >             ____

>      >      >

>      >      >             So perhaps I don=E2=80=99t get =
Chris=E2=80=99s point and would

>     wait

>      >     for him

>      >      >             to clarify.____

>      >      >

>      >      >             [Bruno] I=E2=80=99ll leave this to =
Chris.____

>      >      >

>      >      >             ____

>      >      >

>      >      >             Thanks,____

>      >      >

>      >      >             Ketan____

>      >      >

>      >      >             ____

>      >      >

>      >      >             *From:*Lsr <lsr-bounces@ietf.org

>     < <mailto:lsr-bounces@ietf.org> mailto:lsr-bounces@ietf.org>

>      >     < =
<mailto:lsr-bounces@ietf.org%20%3cmailto:lsr-bounces@ietf.org> =
mailto:lsr-bounces@ietf.org <mailto:lsr-bounces@ietf.org>>

>      >      >             <mailto:lsr-bounces@ietf.org

>     < <mailto:lsr-bounces@ietf.org> mailto:lsr-bounces@ietf.org>

>      >     < =
<mailto:lsr-bounces@ietf.org%20%3cmailto:lsr-bounces@ietf.org> =
mailto:lsr-bounces@ietf.org <mailto:lsr-bounces@ietf.org>>>>

>     *On Behalf Of

>      >      >              <mailto:*bruno.decraene@orange.com> =
*bruno.decraene@orange.com

>     < <mailto:bruno.decraene@orange.com> =
mailto:bruno.decraene@orange.com>

>      >     <mailto:bruno.decraene@orange.com

>     < <mailto:bruno.decraene@orange.com> =
mailto:bruno.decraene@orange.com>>

>     < =
<mailto:bruno.decraene@orange.com%20%3cmailto:bruno.decraene@orange.com> =
mailto:bruno.decraene@orange.com <mailto:bruno.decraene@orange.com>

>      >     <mailto:bruno.decraene@orange.com

>     < <mailto:bruno.decraene@orange.com> =
mailto:bruno.decraene@orange.com>>>

>      >      >             *Sent:* 28 February 2020 14:34

>      >      >             *To:* Ketan Talaulikar (ketant)

>      >      >             <ketant=3D40cisco.com@dmarc.ietf.org

>     < <mailto:40cisco.com@dmarc.ietf.org> =
mailto:40cisco.com@dmarc.ietf.org>

>      >     <mailto:40cisco.com@dmarc.ietf.org

>     < <mailto:40cisco.com@dmarc.ietf.org> =
mailto:40cisco.com@dmarc.ietf.org>>

>      >      >             <mailto:40cisco..com@dmarc.ietf.org

>     < <mailto:40cisco..com@dmarc.ietf.org> =
mailto:40cisco..com@dmarc.ietf.org>

>      >     <mailto:40cisco..com@dmarc.ietf.org

>     < <mailto:40cisco..com@dmarc.ietf.org> =
mailto:40cisco..com@dmarc.ietf.org>>>>; Chris Bowers

>      >      >             <chrisbowers.ietf@gmail.com

>     < <mailto:chrisbowers.ietf@gmail.com> =
mailto:chrisbowers.ietf@gmail.com>

>      >     <mailto:chrisbowers.ietf@gmail.com

>     < <mailto:chrisbowers.ietf@gmail.com> =
mailto:chrisbowers.ietf@gmail.com>>

>      >     <mailto:chrisbowers.ietf@gmail.com

>     < <mailto:chrisbowers.ietf@gmail.com> =
mailto:chrisbowers.ietf@gmail.com>

>     <mailto:chrisbowers.ietf@gmail.com

>     < <mailto:chrisbowers.ietf@gmail.com> =
mailto:chrisbowers.ietf@gmail.com>>>>

>      >      >             *Cc:*  <mailto:lsr@ietf.org> lsr@ietf.org < =
<mailto:lsr@ietf.org> mailto:lsr@ietf.org>

>     < <mailto:lsr@ietf.org%20%3cmailto:lsr@ietf.org> =
mailto:lsr@ietf.org <mailto:lsr@ietf.org>>

>      >     < <mailto:lsr@ietf.org%20%3cmailto:lsr@ietf.org> =
mailto:lsr@ietf.org <mailto:lsr@ietf.org>

>     < <mailto:lsr@ietf.org%20%3cmailto:lsr@ietf.org> =
mailto:lsr@ietf.org <mailto:lsr@ietf.org>>>; SPRING WG List

>      >      >             < =
<mailto:spring@ietf.org%20%3cmailto:spring@ietf.org> spring@ietf.org =
<mailto:spring@ietf.org>

>     < <mailto:spring@ietf.org%20%3cmailto:spring@ietf.org> =
mailto:spring@ietf.org <mailto:spring@ietf.org>>

>      >     < <mailto:spring@ietf.org%20%3cmailto:spring@ietf.org> =
mailto:spring@ietf.org <mailto:spring@ietf.org>

>     < <mailto:spring@ietf.org%20%3cmailto:spring@ietf.org> =
mailto:spring@ietf.org <mailto:spring@ietf.org>>>>;

>      >      >             draft-ietf-spring-srv6-network-programming

>      >      >          =20

>       <draft-ietf-spring-srv6-network-programming@ietf.org

>     < <mailto:draft-ietf-spring-srv6-network-programming@ietf.org> =
mailto:draft-ietf-spring-srv6-network-programming@ietf.org>

>      >     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org

>     < <mailto:draft-ietf-spring-srv6-network-programming@ietf.org> =
mailto:draft-ietf-spring-srv6-network-programming@ietf.org>>

>      >      >

>      >       =
<mailto:draft-ietf-spring-srv6-network-programming@ietf.org

>     < <mailto:draft-ietf-spring-srv6-network-programming@ietf.org> =
mailto:draft-ietf-spring-srv6-network-programming@ietf.org>

>      >     <mailto:draft-ietf-spring-srv6-network-programming@ietf.org

>     < <mailto:draft-ietf-spring-srv6-network-programming@ietf.org> =
mailto:draft-ietf-spring-srv6-network-programming@ietf.org>>>>;

>      >      >             Peter Psenak (ppsenak) <ppsenak@cisco.com

>     < <mailto:ppsenak@cisco.com> mailto:ppsenak@cisco.com>

>      >     < <mailto:ppsenak@cisco.com%20%3cmailto:ppsenak@cisco.com> =
mailto:ppsenak@cisco.com <mailto:ppsenak@cisco.com>>

>      >      >             <mailto:ppsenak@cisco.com

>     < <mailto:ppsenak@cisco.com> mailto:ppsenak@cisco.com> =
<mailto:ppsenak@cisco.com

>     < <mailto:ppsenak@cisco.com> mailto:ppsenak@cisco.com>>>>

>      >      >             *Subject:* Re: [Lsr] clarification of =
locator

>     block and

>      >      >             locator node in

>      >     draft-ietf-spring-srv6-network-programming

>      >      >             and draft-ietf-lsr-isis-srv6-extensions____

>      >      >

>      >      >             ____

>      >      >

>      >      >             Hi Ketan,____

>      >      >

>      >      >             ____

>      >      >

>      >      >             ____

>      >      >

>      >      >             ____

>      >      >

>      >      >             *From:*Lsr [mailto:lsr-bounces@ietf.org

>     < <mailto:lsr-bounces@ietf.org> mailto:lsr-bounces@ietf.org>

>      >     < =
<mailto:lsr-bounces@ietf.org%20%3cmailto:lsr-bounces@ietf.org> =
mailto:lsr-bounces@ietf.org <mailto:lsr-bounces@ietf.org>>]

>     *On Behalf Of

>      >      >             *Ketan Talaulikar (ketant)

>      >      >             *Sent:* Friday, February 28, 2020 6:30 =
AM____

>      >      >

>      >      >             ____

>      >      >

>      >      >             Hi Chris,____

>      >      >

>      >      >             ____

>      >      >

>      >      >             I agree with Peter and I would suggest to =
drop

>     LSR since

>      >      >             this is not a protocol specific thing.____

>      >      >

>      >      >             ____

>      >      >

>      >      >             I believe the text in

>      >      >             draft-ietf-spring-srv6-network-programming =
clears

>      >     says what

>      >      >             locator block and locator node are. What =
more

>     details

>      >     do you

>      >      >             think are required?____

>      >      >

>      >      >             ____

>      >      >

>      >      >             [Bruno] Speaking as an individual, the draft =
could

>      >     possibly

>      >      >             clarify the usage of these =
information/fields

>     by the

>      >      >             receiver. Possibly using the same name/term =
(e.g.

>      >     SRv6 SID

>      >      >             Locator Block length) to ease the references

>     between both

>      >      >             drafts.____

>      >      >

>      >      >             ____

>      >      >

>      >      >             Thanks,____

>      >      >

>      >      >             --Bruno____

>      >      >

>      >      >             ____

>      >      >

>      >      >             Thanks,____

>      >      >

>      >      >             Ketan____

>      >      >

>      >      >             ____

>      >      >

>      >      >             *From:*Lsr <lsr-bounces@ietf.org

>     < <mailto:lsr-bounces@ietf.org> mailto:lsr-bounces@ietf.org>

>      >     < =
<mailto:lsr-bounces@ietf.org%20%3cmailto:lsr-bounces@ietf.org> =
mailto:lsr-bounces@ietf.org <mailto:lsr-bounces@ietf.org>>

>      >      >             <mailto:lsr-bounces@ietf.org

>     < <mailto:lsr-bounces@ietf.org> mailto:lsr-bounces@ietf.org>

>      >     < =
<mailto:lsr-bounces@ietf.org%20%3cmailto:lsr-bounces@ietf.org> =
mailto:lsr-bounces@ietf.org <mailto:lsr-bounces@ietf.org>>>>

>     *On Behalf Of *Chris Bowers

>      >      >             *Sent:* 27 February 2020 22:46

>      >      >             *To:*  <mailto:lsr@ietf.org> lsr@ietf.org < =
<mailto:lsr@ietf.org> mailto:lsr@ietf.org>

>     < <mailto:lsr@ietf.org%20%3cmailto:lsr@ietf.org> =
mailto:lsr@ietf.org <mailto:lsr@ietf.org>>

>      >     < <mailto:lsr@ietf.org%20%3cmailto:lsr@ietf.org> =
mailto:lsr@ietf.org <mailto:lsr@ietf.org>

>     < <mailto:lsr@ietf.org%20%3cmailto:lsr@ietf.org> =
mailto:lsr@ietf.org <mailto:lsr@ietf.org>>>; SPRING WG List

>      >      >             < =
<mailto:spring@ietf.org%20%3cmailto:spring@ietf.org> spring@ietf.org =
<mailto:spring@ietf.org>

>     < <mailto:spring@ietf.org%20%3cmailto:spring@ietf.org> =
mailto:spring@ietf.org <mailto:spring@ietf.org>>

>      >     < <mailto:spring@ietf.org%20%3cmailto:spring@ietf.org> =
mailto:spring@ietf.org <mailto:spring@ietf.org>

>     < <mailto:spring@ietf.org%20%3cmailto:spring@ietf.org> =
mailto:spring@ietf.org <mailto:spring@ietf.org>>>>

>      >      >             *Cc:* Peter Psenak (ppsenak)

>     < <mailto:ppsenak@cisco.com%20%3cmailto:ppsenak@cisco.com> =
ppsenak@cisco.com <mailto:ppsenak@cisco.com>

>      >     < <mailto:ppsenak@cisco.com%20%3cmailto:ppsenak@cisco.com> =
mailto:ppsenak@cisco.com <mailto:ppsenak@cisco.com>>

>      >      >             <mailto:ppsenak@cisco.com

>     < <mailto:ppsenak@cisco.com> mailto:ppsenak@cisco.com> =
<mailto:ppsenak@cisco.com

>     < <mailto:ppsenak@cisco.com> mailto:ppsenak@cisco.com>>>>

>      >      >             *Subject:* [Lsr] clarification of locator

>     block and

>      >     locator

>      >      >             node in

>     draft-ietf-spring-srv6-network-programming and

>      >      >             draft-ietf-lsr-isis-srv6-extensions____

>      >      >

>      >      >             ____

>      >      >

>      >      >             SPRING and LSR WGs,____

>      >      >

>      >      >             ____

>      >      >

>      >      >             I think that we need a much more detailed

>     description

>      >     of the

>      >      >             locator block and locator node in either

>      >      >             draft-ietf-spring-srv6-network-programming =
or

>      >      >             draft-ietf-lsr-isis-srv6-extensions.  See

>     original email

>      >      >             below.____

>      >      >

>      >      >             ____

>      >      >

>      >      >             Thanks,____

>      >      >

>      >      >             Chris____

>      >      >

>      >      >             ____

>      >      >

>      >      >             On Thu, Feb 27, 2020 at 11:08 AM Peter =
Psenak

>      >      >             < =
<mailto:ppsenak@cisco.com%20%3cmailto:ppsenak@cisco.com> =
ppsenak@cisco.com <mailto:ppsenak@cisco.com>

>     < <mailto:ppsenak@cisco.com%20%3cmailto:ppsenak@cisco.com> =
mailto:ppsenak@cisco.com <mailto:ppsenak@cisco.com>>

>      >     < <mailto:ppsenak@cisco.com%20%3cmailto:ppsenak@cisco.com> =
mailto:ppsenak@cisco.com <mailto:ppsenak@cisco.com>

>     < <mailto:ppsenak@cisco.com%20%3cmailto:ppsenak@cisco.com> =
mailto:ppsenak@cisco.com <mailto:ppsenak@cisco.com>>>> wrote:____

>      >      >

>      >      >                 Hi Chris,

>      >      >

>      >      >                 On 27/02/2020 17:54, Chris Bowers wrote:

>      >      >                  > LSR WG,

>      >      >                  >

>      >      >                  > Section 9 of

>      >     draft-ietf-lsr-isis-srv6-extensions-05

>      >      >                 defines the  SRv6

>      >      >                  > SID Structure Sub-Sub-TLV. In

>     particular, it

>      >     defines

>      >      >                 encoding for the

>      >      >                  > locator block length and the locator

>     node length.

>      >      >                 The text refers to

>      >      >                  >

>     [I-D.ietf-spring-srv6-network-programming] for the

>      >      >                 definition of these

>      >      >                  > concepts.

>      >      >                  >

>      >      >                  > As far as I can tell, the only =
reference to

>      >     locator

>      >      >                 block and locator

>      >      >                  > node in

>      >     draft-ietf-spring-srv6-network-programming-10

>      >      >                 is section 3.1

>      >      >                  > which has the following text:

>      >      >                  >

>      >      >                  >     A locator may be represented as =
B:N

>     where B is

>      >      >                 the SRv6 SID block

>      >      >                  >     (IPv6 subnet allocated for SRv6

>     SIDs by the

>      >      >                 operator) and N is the

>      >      >                  >     identifier of the parent node

>      >     instantiating the

>      >      >                 SID...

>      >      >                  >

>      >      >                  > I think that we need a much more =
detailed

>      >     description

>      >      >                 of the locator

>      >      >                  > block and locator node.

>      >      >

>      >      >                 sure, but that would be in the

>      >      >              =20

>       draft-ietf-spring-srv6-network-programming-10, not in

>      >      >                 draft-ietf-lsr-isis-srv6-extensions, as

>     these are

>      >     not a

>      >      >                 protocol

>      >      >                 specific constructs.

>      >      >

>      >      >                 thanks,

>      >      >                 Peter

>      >      >

>      >      >                  >

>      >      >                  > Thanks,

>      >      >                  >

>      >      >                  > Chris

>      >      >                  > ____

>      >      >

>      >      >

>      >    =20

>       =
_________________________________________________________________________=
____________________________________________________

>      >      >

>      >      >             ____

>      >      >

>      >      >             Ce message et ses pieces jointes peuvent

>     contenir des

>      >      >             informations confidentielles ou privilegiees =
et ne

>      >     doivent donc____

>      >      >

>      >      >             pas etre diffuses, exploites ou copies sans

>      >     autorisation. Si

>      >      >             vous avez recu ce message par erreur, =
veuillez le

>      >     signaler____

>      >      >

>      >      >             a l'expediteur et le detruire ainsi que les =
pieces

>      >     jointes.

>      >      >             Les messages electroniques etant =
susceptibles

>      >     d'alteration,____

>      >      >

>      >      >             Orange decline toute responsabilite si ce

>     message a ete

>      >      >             altere, deforme ou falsifie. Merci.____

>      >      >

>      >      >             ____

>      >      >

>      >      >             This message and its attachments may contain

>      >     confidential or

>      >      >             privileged information that may be protected

>     by law;____

>      >      >

>      >      >             they should not be distributed, used or =
copied

>     without

>      >      >             authorisation.____

>      >      >

>      >      >             If you have received this email in error, =
please

>      >     notify the

>      >      >             sender and delete this message and its

>     attachments.____

>      >      >

>      >      >             As emails may be altered, Orange is not =
liable for

>      >     messages

>      >      >             that have been modified, changed or =
falsified.____

>      >      >

>      >      >             Thank you.____

>      >      >

>      >      >

>      >    =20

>       =
_________________________________________________________________________=
____________________________________________________

>      >      >

>      >      >             ____

>      >      >

>      >      >             Ce message et ses pieces jointes peuvent

>     contenir des

>      >      >             informations confidentielles ou privilegiees =
et ne

>      >     doivent donc____

>      >      >

>      >      >             pas etre diffuses, exploites ou copies sans

>      >     autorisation. Si

>      >      >             vous avez recu ce message par erreur, =
veuillez le

>      >     signaler____

>      >      >

>      >      >             a l'expediteur et le detruire ainsi que les =
pieces

>      >     jointes.

>      >      >             Les messages electroniques etant =
susceptibles

>      >     d'alteration,____

>      >      >

>      >      >             Orange decline toute responsabilite si ce

>     message a ete

>      >      >             altere, deforme ou falsifie. Merci.____

>      >      >

>      >      >             ____

>      >      >

>      >      >             This message and its attachments may contain

>      >     confidential or

>      >      >             privileged information that may be protected

>     by law;____

>      >      >

>      >      >             they should not be distributed, used or =
copied

>     without

>      >      >             authorisation.____

>      >      >

>      >      >             If you have received this email in error, =
please

>      >     notify the

>      >      >             sender and delete this message and its

>     attachments.____

>      >      >

>      >      >             As emails may be altered, Orange is not =
liable for

>      >     messages

>      >      >             that have been modified, changed or =
falsified.____

>      >      >

>      >      >             Thank you.____

>      >      >

>      >

>=20

=20

=20

_______________________________________________

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<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" />
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<o:shapelayout v:ext=3D"edit">
<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]--></head><body lang=3DZH-CN =
link=3D"#0563C1" vlink=3D"#954F72" =
style=3D'text-justify-trim:punctuation'><div class=3DWordSection1><p =
class=3DMsoNormal><span lang=3DEN-US style=3D'color:black'>Hi =
Xuesong,<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:black'>I agree with Xuesong</span><span lang=3DEN-US =
style=3D'font-size:11.0pt;color:black'>. <o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt;color:black'>It has been in the draft for =
quite some time and is useful. <o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt;color:black'>I do not see any issues with the =
proposed encodings for the SID Structure sub-TLV in the =
draft.</span><span lang=3DEN-US =
style=3D'font-size:11.0pt'><o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt;color:black'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt;color:black'>B.R.<o:p></o:p></span></p><p =
class=3DMsoNormal><span lang=3DEN-US =
style=3D'font-size:11.0pt;color:black'>Weiqiang =
Cheng<o:p></o:p></span></p><p class=3DMsoNormal><span lang=3DEN-US =
style=3D'color:#1F497D'><o:p>&nbsp;</o:p></span></p><div><div =
style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm'><p class=3DMsoNormal align=3Dleft =
style=3D'text-align:left'><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E4=BB=
=B6=E4=BA=BA<span lang=3DEN-US>:</span></span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> spring =
[mailto:spring-bounces@ietf.org] </span><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E4=BB=A3=E8=A1=
=A8 </span></b><span lang=3DEN-US =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>Gengxuesong =
(Geng Xuesong)<br></span><b><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=8F=91=E9=80=
=81=E6=97=B6=E9=97=B4<span lang=3DEN-US>:</span></span></b><span =
lang=3DEN-US style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'> =
2020</span><span =
style=3D'font-size:10.0pt;font-family:=E5=AE=8B=E4=BD=93'>=E5=B9=B4<span =
lang=3DEN-US>4</span>=E6=9C=88<span lang=3DEN-US>7</span>=E6=97=A5<span =
lang=3DEN-US> 10:56<br></span><b>=E6=94=B6=E4=BB=B6=E4=BA=BA<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Peter Psenak; Chris =
Bowers<br></span><b>=E6=8A=84=E9=80=81<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> lsr@ietf.org; SPRING WG =
List; Ketan Talaulikar (ketant); Bruno =
Decraene<br></span><b>=E4=B8=BB=E9=A2=98<span =
lang=3DEN-US>:</span></b><span lang=3DEN-US> Re: [spring] [Lsr] =
clarification of locator block and locator node in =
draft-ietf-spring-srv6-network-programming and =
draft-ietf-lsr-isis-srv6-extensions<o:p></o:p></span></span></p></div></d=
iv><p class=3DMsoNormal align=3Dleft style=3D'text-align:left'><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoPlainText =
style=3D'line-height:150%'><span lang=3DEN-US>Hi Chris, =
Peter,<o:p></o:p></span></p><p class=3DMsoPlainText =
style=3D'line-height:150%'><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoPlainText =
style=3D'line-height:150%'><span lang=3DEN-US>Here are some personal =
opinions about this discussion:<o:p></o:p></span></p><p =
class=3DMsoPlainText =
style=3D'margin-left:21.0pt;text-indent:-21.0pt;line-height:150%'><span =
lang=3DEN-US>-</span><span lang=3DEN-US =
style=3D'font-size:7.0pt;line-height:150%;font-family:"Times New =
Roman","serif"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp; </span><span lang=3DEN-US>Keep LBL and LNL in the structure =
sub-TLV is better for protocol scalability and flexibility, an operator =
could choose to allocate SRv6 locator from the same locator block, or =
from different locator block.<o:p></o:p></span></p><p =
class=3DMsoPlainText =
style=3D'margin-left:21.0pt;text-indent:-21.0pt;line-height:150%'><span =
lang=3DEN-US>-</span><span lang=3DEN-US =
style=3D'font-size:7.0pt;line-height:150%;font-family:"Times New =
Roman","serif"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp; </span><span lang=3DEN-US>It is suggested to design SID =
structure sub-TLV as a general TLV which could be used for =
BGP/BGP-LS/ISIS/OSPF. <o:p></o:p></span></p><p class=3DMsoPlainText =
style=3D'margin-left:21.0pt;text-indent:-21.0pt;line-height:150%'><span =
lang=3DEN-US>-</span><span lang=3DEN-US =
style=3D'font-size:7.0pt;line-height:150%;font-family:"Times New =
Roman","serif"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp; </span><span lang=3DEN-US>SID is supposed to be advertised =
with suitable protocol based on the use case. Whether it contains =
argument or not is not relevant.<o:p></o:p></span></p><p =
class=3DMsoPlainText style=3D'line-height:150%'><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoPlainText =
style=3D'line-height:150%'><span =
lang=3DEN-US>B.R.<o:p></o:p></span></p><p class=3DMsoPlainText =
style=3D'line-height:150%'><span =
lang=3DEN-US>Xuesong<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>-----Original Message-----<br>From: spring =
[mailto:spring-bounces@ietf.org] On Behalf Of Peter Psenak<br>Sent: =
Monday, April 6, 2020 7:03 PM<br>To: Chris Bowers =
&lt;chrisbowers.ietf@gmail.com&gt;<br>Cc: lsr@ietf.org; SPRING WG List =
&lt;spring@ietf.org&gt;; Ketan Talaulikar (ketant) =
&lt;ketant@cisco.com&gt;; Bruno Decraene =
&lt;bruno.decraene@orange.com&gt;<br>Subject: Re: [spring] [Lsr] =
clarification of locator block and locator node in =
draft-ietf-spring-srv6-network-programming and =
draft-ietf-lsr-isis-srv6-extensions<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>Chris,<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>On 01/04/2020 21:58, Chris =
Bowers wrote:<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; Peter,<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; There seem to be two =
disconnects in this discussion.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; 1) The response below =
implies that the encodings in <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; =
draft-ietf-lsr-isis-srv6-extensions are supposed represent the case =
<o:p></o:p></span></p><p class=3DMsoPlainText><span lang=3DEN-US>&gt; =
where the locators are allocated from several different IPv6 address =
<o:p></o:p></span></p><p class=3DMsoPlainText><span lang=3DEN-US>&gt; =
blocks (for example, blocks S1/s1 through Sn/sn). However, =
<o:p></o:p></span></p><p class=3DMsoPlainText><span lang=3DEN-US>&gt; =
draft-ietf-spring-srv6-network-programming and <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; =
draft-ietf-6man-segment-routing-header only discuss the case where the =
<o:p></o:p></span></p><p class=3DMsoPlainText><span lang=3DEN-US>&gt; =
locators are allocated from a single block (S/s).</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> If an <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; implementation is expected to properly encode the case =
where locators <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; are allocated from several different IPv6 address =
blocks, then I think <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; that case should be explicitly described in these =
documents.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>There is no statement in =
draft-ietf-spring-srv6-network-programming that the block is unique. As =
an example, Iliad authorized me to indicate that their SRv6 deployment =
involves several blocks.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US =
style=3D'color:black'><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; 2)</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;&nbsp;</span><span =
lang=3DEN-US> The response below says &quot;To be able to find out where =
the func <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; and arg are located, you need to know the LOC length, =
e.g. Block and <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; Node length.&quot;</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
However, the SRv6 SID Structure Sub-Sub-TLV is carried =
<o:p></o:p></span></p><p class=3DMsoPlainText><span lang=3DEN-US>&gt; =
within the SRv6 End SID, SRv6 End.X SID, and the SRv6 LAN End.X SID =
<o:p></o:p></span></p><p class=3DMsoPlainText><span lang=3DEN-US>&gt; =
Sub-TLVs, which are carried within the SRv6 Locator =
TLV.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>not really. SRv6 End.X SID, and the SRv6 LAN End.X SID =
Sub-TLVs are advertised in the IS Reachability TLVs (22, 23, 222, 223, =
141), not in<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>SRv6 Locator TLV.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>thanks,<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>Peter<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US><o:p>&nbsp;</o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; The</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> SRv6 Locator TLV<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; has a Loc-Size =
field.</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> Why would the value of the LOC =
length computed <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; as the sum of the Block and Node length ever be =
different from the <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; value in the Loc-Size field?<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; =
Chris<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; On Wed, Mar 25, 2020 at 9:49 AM Peter Psenak =
&lt;ppsenak@cisco.com <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; &lt;<a =
href=3D"mailto:ppsenak@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ppsenak@cisco.com<=
/span></a>&gt;&gt; wrote:<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
Chris,<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; please see =
inline:<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; On 23/03/2020 17:39, Chris =
Bowers wrote:<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; =
Peter,<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; The proposed SRv6 =
SID Structure Sub-Sub-TLV has several problems.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; 1) As discussed in =
item#3 below, it is not clear that flooding LB<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; Length, LN Length, =
Fun. Length, and Arg. Length to all ISIS<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
speakers is<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; really the right =
approach.</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> However, if the WG determines =
that it<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; is the<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&gt; right approach, the current encodings of this information in =
the<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; proposed SRv6 SID =
Structure Sub-Sub-TLV are problematic.</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
As<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
discussed<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; earlier in this =
thread, a network operator may choose to not<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
allocate<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; all locators from a =
single block, so LB Length and LN Length may<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; not =
be<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; =
well-defined.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; I'm not sure what do you mean =
by not &quot;well defined&quot;. For every SID =
you<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; need to know the LOC (B+N) =
part. If you guarantee that it is the<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
same on<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; all nodes, you know it from =
the local config, otherwise, you advertise<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; it =
with a SID.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; The current =
encoding of the SRv6 SID Structure<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; Sub-Sub-TLV makes =
it difficult to represent this situation.</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
The<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; simple<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; thing to do for =
nodes that don't have a well-defined value of LB<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
Length<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; and LN Length would =
be to not advertise a value for LB Length and LN<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; Length.</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> However, since the currently proposed SRv6 SID =
Structure<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; Sub-Sub-TLV =
combines LB Length, LN Length, Fun. Length, and =
Arg.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; Length<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; into a single =
sub-sub-TLV, if a node wants to advertise values<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; for =
Fun.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; Length and Arg. =
Length, it also has to advertise values for LB<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
Length<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; and LN =
Length.</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> It seems like a better approach =
would be to have<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; different =
sub-sub-TLVs, one for</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> LB =
Length and LN Length, and a<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
separate<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; one for Fun. Length =
and Arg. Length to be able to better<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
represent this<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&gt; =
situation.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; I'm afraid you are missing an =
important point.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; SRv6 SID is defined as =
LOC:FUNCT:ARG, where LOC is represented as B:N.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; To =
be able to find out where the func and arg are located, you need =
to<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; know the LOC length, e.g. =
Block and Node length. Advertising just Func<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; and =
Arg length does not help.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; 2) Now consider the =
situation where a network operator chooses to<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; allocate all =
locators from a single block, so that LB Length and =
LN<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; Length are =
well-defined across the network.</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> A =
given node should<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; presumably =
advertise its own understanding of LB Length and =
LN<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
Length.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; A given node's =
understanding of LB Length and LN Length is a<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
property of<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; the =
node.</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> It is not a property of a given =
End SID.</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> The =
currently<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; proposed SRv6 SID =
Structure Sub-Sub-TLV however is carried within<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
each<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; End SID =
Sub-TLV.</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> With the currently proposed =
encoding,<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; presumably =
an<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; implementation is =
expected to send the exact same values of LB<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
Length<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; and LN Length for =
all of the End SIDs that it advertises.</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
Not<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; only =
is<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; this inefficient, =
but it creates the need for logic to decide<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
what to do<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&gt; when different End =
SIDs advertised by the same node carry different<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; values of LB Length =
and LN Length in their sub-sub-TLVs.</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
It<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; seems =
like<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; a better approach =
would be for a given node to advertise its<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; understanding of =
the value of LB Length and LN Length in a<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
sub-TLV of<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; the Router =
Capability TLV.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; When we design the encoding, =
we have to define it such, that it<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
supports<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; all possible use cases. We can =
not design the encoding that works for<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
single use case (allocate all locators from a single block) and =
does<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; not<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
work for others - different block from different node, multiple =
blocks<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; on a single node (e.g. border =
node), which are all valid.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; 3) At this point, =
the only use case that has been proposed for<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
flooding<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; the LB Length, LN =
Length, Fun. Length, and Arg. Length to all ISIS<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; speakers is to make =
it more convenient for BGP-LS to get those<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
values to<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&gt; an external =
controller as part of a topology feed from any =
ISIS<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; node.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; No use case has =
been proposed for ISIS speakers themselves to<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
make use<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; of the =
information.</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> It seems like a more scalable =
approach would<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; be to<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&gt; use BGP-LS sessions to collect the =
information from the subset of<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
nodes<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; that actually =
produce the relevant information.</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> So =
far there are<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; no End<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; SIDs defined that =
are advertised in ISIS that have a non-zero Arg.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; Length.</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> If an End SID with non-zero Arg. Length were to =
be<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; proposed =
in<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; the future as =
needing to be flooded to all ISIS nodes, it =
seems<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; likely<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; that the new End =
SID would also be advertised using the BGP<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
IP/VPN/EVPN<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&gt; control plane. =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> So it seems like a viable =
alternative for this<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; hypothetical future =
End SID would be to have the subset of nodes<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
that<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; have non-zero Arg. =
Length values communicate to an external<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
controller<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; via</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> BGP sessions. I think the WG needs a more =
detailed<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; discussion of =
a<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; concrete use case =
in order to determine whether flooding LB<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
Length, LN<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; Length, Fun. =
Length, and Arg. Length to all ISIS speakers is<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
really the<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; right =
approach.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; there are networks, where BGP =
is not deployed on all nodes, only on a<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; few =
nodes that re-distribute the information to BGP-LS. In such case =
we<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; need the IGP to distribute =
this data.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; Argument that &quot;it seems =
likely that the new End SID would also be<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
advertised using the BGP IP/VPN/EVPN&quot; is a wishful thinking that we =
can<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; not based our encoding =
on.<o:p></o:p></span></p><p class=3DMsoPlainText><span lang=3DEN-US>&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span lang=3DEN-US>&gt; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; Given the lack of a =
compelling use case for flooding LB Length, LN<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; Length, Fun. =
Length, and Arg. Length to all ISIS speakers and =
the<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; problems with the =
currently proposed encodings for doing that, I<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
think<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; that the SRv6 SID =
Structure Sub-Sub-TLV should be removed from<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; =
draft-ietf-lsr-isis-srv6-extensions. A mechanism for flooding =
LB<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
Length,<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; LN Length, Fun. =
Length, and Arg. Length to all ISIS speakers can =
be<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; defined in a future =
document.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; The security use case has =
already been pointed out earlier in this<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
thread:<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <a =
href=3D"https://tools.ietf.org/html/draft-ietf-6man-segment-routing-heade=
r-26"><span =
style=3D'color:windowtext;text-decoration:none'>https://tools.ietf.org/ht=
ml/draft-ietf-6man-segment-routing-header-26#</span></a><o:p></o:p></span=
></p><p class=3DMsoPlainText><span lang=3DEN-US>&gt; =
section-5<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt; <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; Given the arguments I =
mentioned above, I respectfully disagree with =
the<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; removal of the SID Structure =
Sub-Sub-TLV from the ISIS SRv6 draft.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
thanks,<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; Peter<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; =
Thanks,<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; =
Chris<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; On Fri, Mar 13, =
2020 at 5:02 AM Peter Psenak =
&lt;ppsenak@cisco.com<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; &lt;<a =
href=3D"mailto:ppsenak@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ppsenak@cisco.com<=
/span></a>&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; &lt;<a =
href=3D"mailto:ppsenak@cisco.com%20%3cmailto:ppsenak@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ppsenak@cisco.com =
&lt;mailto:ppsenak@cisco.com</span></a>&gt;&gt;&gt; =
wrote:<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US>Hi =
Chris,<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US>On =
12/03/2020 15:58, Chris Bowers wrote:<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt; Peter,<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt; I think that the SRv6 SID Structure Sub-Sub-TLV should =
be<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
removed<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>from<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt; draft-ietf-lsr-isis-srv6-extensions.</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> I =
think that we should<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>leave the<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt; ability to include sub-sub-TLVs in the SRv6 End SID =
Sub-TLV,<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>End.X SID<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt; Sub-TLV, and LAN End.X SID Sub-TLV in the encodings for =
those<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>sub-TLVs.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt; I don't think that the current text describing the SRv6 =
SID<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>Structure<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt; Sub-Sub-TLV would result in interoperable<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
implementations.</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> Based<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US>on =
the<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US>SRv6 =
base spec defines SID B, L, A, F.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US>SRv6 =
protocol specs are advertising these values with =
the<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; SRv6 =
SID,<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>they<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>don't use them. The usage is outside of the scope of the =
protocol<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>drafts. What exactly is the =
problem?<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>thanks,<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>Peter<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt; discussion with Ketan below, it appears that use cases =
for<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; ISIS<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>speakers<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt; receiving advertised values of LB Length, LN Length, =
Fun.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
Length,<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>and<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt; Arg. Length are not currently well-defined. </span><span =
lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;&nbsp;</span><span lang=3DEN-US> So I think =
it<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>makes sense<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt; to defer the definition of the SRv6 SID =
Structure<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; Sub-Sub-TLV to =
a<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt; future document.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt; Thanks,<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt; Chris<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt; On Thu, Mar 12, 2020 at 6:02 AM Ketan Talaulikar =
(ketant)<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt; &lt;<a =
href=3D"mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>ketant@cisco.com =
&lt;mailto:ketant@cisco.com</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a =
href=3D"mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ketant@cisco.com =
&lt;mailto:ketant@cisco.com</span></a>&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;<a =
href=3D"mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ketant@cisco.com =
&lt;mailto:ketant@cisco.com</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a =
href=3D"mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ketant@cisco.com =
&lt;mailto:ketant@cisco.com</span></a>&gt;&gt;&gt;&gt; =
wrote:<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Hi =
Chris,____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>__ __<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Dropping =
the<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
draft-ietf-spring-srv6-network-programming =
authors<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>since we are now back to =
discussing the ISIS<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
extensions.____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>__ __<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Please check inline =
below.____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>__ __<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*From:*Chris Bowers =
&lt;chrisbowers.ietf@gmail.com<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:chrisbowers.ietf@gmail.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:chrisbowers.ietf@g=
mail.com</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:chrisbowers.ietf@gmail.com<o:p></o:p></span></p><=
p class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:chrisbowers.ietf@gmail.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:chrisbowers.ietf@g=
mail.com</span></a>&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:chrisbowers.ietf@gmail.com<o:p></o:p></span></p><=
p class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:chrisbowers.ietf@gmail.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:chrisbowers.ietf@g=
mail.com</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:chrisbowers.ietf@gmail.com<o:p></o:p></span></p><=
p class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:chrisbowers.ietf@gmail.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:chrisbowers.ietf@g=
mail.com</span></a>&gt;&gt;&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*Sent:* 05 March 2020 =
21:53<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*To:* Ketan Talaulikar (ketant) =
&lt;ketant@cisco.com<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp; &nbsp;&nbsp;&nbsp;&lt;<a =
href=3D"mailto:ketant@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ketant@cisco.com</=
span></a>&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;<a =
href=3D"mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ketant@cisco.com =
&lt;mailto:ketant@cisco.com</span></a>&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>&lt;<a =
href=3D"mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ketant@cisco.com =
&lt;mailto:ketant@cisco.com</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a =
href=3D"mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ketant@cisco.com =
&lt;mailto:ketant@cisco.com</span></a>&gt;&gt;&gt;&gt;<o:p></o:p></span><=
/p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*Cc:* Ketan Talaulikar (ketant) =
&lt;ketant@cisco.com<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; &lt;<a =
href=3D"mailto:ketant@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ketant@cisco.com</=
span></a>&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;<a =
href=3D"mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ketant@cisco.com =
&lt;mailto:ketant@cisco.com</span></a>&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>&lt;<a =
href=3D"mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ketant@cisco.com =
&lt;mailto:ketant@cisco.com</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a =
href=3D"mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ketant@cisco.com =
&lt;mailto:ketant@cisco.com</span></a>&gt;&gt;&gt;&gt;;<o:p></o:p></span>=
</p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt; <a =
href=3D"mailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>lsr@ietf.org</span></a> =
&lt;<a href=3D"mailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr@ietf.org</span=
></a>&gt; &lt;mailto:lsr@ietf.org<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr@ietf.org</span=
></a>&gt;&gt; &lt;<a =
href=3D"mailto:lsr@ietf.org%20%3cmailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr@ietf.org =
&lt;mailto:lsr@ietf.org</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;<a =
href=3D"mailto:lsr@ietf.org%20%3cmailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr@ietf.org =
&lt;mailto:lsr@ietf.org</span></a>&gt;&gt;&gt;;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>SPRING WG List =
&lt;spring@ietf.org<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; &lt;<a =
href=3D"mailto:spring@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:spring@ietf.org</s=
pan></a>&gt; &lt;mailto:spring@ietf.org<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:spring@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:spring@ietf.org</s=
pan></a>&gt;&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;<a =
href=3D"mailto:spring@ietf.org%20%3cmailto:spring@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:spring@ietf.org =
&lt;mailto:spring@ietf.org</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:spring@ietf.org%20%3cmailto:spring@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:spring@ietf.org =
&lt;mailto:spring@ietf.org</span></a>&gt;&gt;&gt;&gt;;<o:p></o:p></span><=
/p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>draft-ietf-spring-srv6-network-programming<o:p></o:p></span>=
</p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;draft-ietf-spring-srv6-network-programming@ietf.org<o:p>=
</o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; &lt;<a =
href=3D"mailto:draft-ietf-spring-srv6-network-programming@ietf.org"><span=
 =
style=3D'color:windowtext;text-decoration:none'>mailto:draft-ietf-spring-=
srv6-network-programming@ietf.org</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:draft-ietf-spring-srv6-network-programming@ietf.o=
rg<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; &lt;<a =
href=3D"mailto:draft-ietf-spring-srv6-network-programming@ietf.org"><span=
 =
style=3D'color:windowtext;text-decoration:none'>mailto:draft-ietf-spring-=
srv6-network-programming@ietf.org</span></a>&gt;&gt;<o:p></o:p></span></p=
><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;&nbsp;&nbsp; <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:draft-ietf-spring-srv6-network-programming@ietf.o=
rg<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; &lt;<a =
href=3D"mailto:draft-ietf-spring-srv6-network-programming@ietf.org"><span=
 =
style=3D'color:windowtext;text-decoration:none'>mailto:draft-ietf-spring-=
srv6-network-programming@ietf.org</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:draft-ietf-spring-srv6-network-programming@ietf.o=
rg<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; &lt;<a =
href=3D"mailto:draft-ietf-spring-srv6-network-programming@ietf.org"><span=
 =
style=3D'color:windowtext;text-decoration:none'>mailto:draft-ietf-spring-=
srv6-network-programming@ietf.org</span></a>&gt;&gt;&gt;&gt;; =
Peter<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Psenak (ppsenak) =
&lt;ppsenak@cisco.com<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; &lt;<a =
href=3D"mailto:ppsenak@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ppsenak@cisco.com<=
/span></a>&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;<a =
href=3D"mailto:ppsenak@cisco.com%20%3cmailto:ppsenak@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ppsenak@cisco.com =
&lt;mailto:ppsenak@cisco.com</span></a>&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a =
href=3D"mailto:ppsenak@cisco.com%20%3cmailto:ppsenak@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ppsenak@cisco.com =
&lt;mailto:ppsenak@cisco.com</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;<a =
href=3D"mailto:ppsenak@cisco.com%20%3cmailto:ppsenak@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ppsenak@cisco.com =
&lt;mailto:ppsenak@cisco.com</span></a>&gt;&gt;&gt;&gt;;<o:p></o:p></span=
></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Bruno Decraene =
&lt;bruno.decraene@orange.com<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:bruno.decraene@orange.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:bruno.decraene@ora=
nge.com</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:bruno.decraene@orange.com<o:p></o:p></span></p><p=
 class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:bruno.decraene@orange.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:bruno.decraene@ora=
nge.com</span></a>&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:bruno.decraene@orange.com<o:p></o:p></span></p><p=
 class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:bruno.decraene@orange.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:bruno.decraene@ora=
nge.com</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:bruno.decraene@orange.com<o:p></o:p></span></p><p=
 class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:bruno.decraene@orange.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:bruno.decraene@ora=
nge.com</span></a>&gt;&gt;&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*Subject:* Re: [Lsr] clarification =
of locator block and<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>locator node<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>in =
draft-ietf-spring-srv6-network-programming and<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>draft-ietf-lsr-isis-srv6-extensions____<o:p></o:p></span></p=
><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>__ __<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Ketan,____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>__ __<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>See inline =
[CB].____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>__ __<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>On Wed, Mar 4, 2020 at 12:36 AM =
Ketan Talaulikar (ketant)<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>&lt;<a =
href=3D"mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>ketant@cisco.com =
&lt;mailto:ketant@cisco.com</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a =
href=3D"mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ketant@cisco.com =
&lt;mailto:ketant@cisco.com</span></a>&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;<a =
href=3D"mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ketant@cisco.com =
&lt;mailto:ketant@cisco.com</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a =
href=3D"mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ketant@cisco.com =
&lt;mailto:ketant@cisco.com</span></a>&gt;&gt;&gt;&gt; =
wrote:____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Hi =
Chris,____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>You are right in that there is no =
assumption that<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; all =
SRv6<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>locators in a domain are allocated =
from the same<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; block.<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Therefore knowing the blocks used =
in the domain is<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>useful.____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&gt;</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>[CB] Since you refer to =
&quot;blocks&quot; (plural) in this<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
sentence,<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US>are =
you<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>saying that in the scenario where =
all SRv6 locators in a<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>domain are<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>not allocated from the same block, =
you would expect<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
different<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>routers in the same domain to =
advertise different<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; values of =
B<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US>and =
N?<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*/[KT] While personally I believe =
it would not be the<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; usual<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>case, it<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>is left to the =
operator.____/*<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*/__ __/*<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>For example, assume we have a =
network where all SRv6<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
locators<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US>in =
a<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>domain are not allocated from the =
same block.</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> Router A<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>advertises<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>an SRv6 Locator TLV with locator =
=3D 2000::/64, and an<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; SRv6 End =
SID<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>sub-TLV with some endpoint =
behavior. Router B<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; advertises an =
SRv6<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Locator TLV with locator =3D =
3000::/64, and an SRv6 End<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; SID =
sub-TLV<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>with some endpoint behavior. What =
should routers A and B<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>advertise<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>as the values of B and N in their =
SRv6 SID Structure<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>Sub-Sub-TLVs ?____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*/[KT] It is difficult for me to =
figure out what the block<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US>and =
node<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>parts are with such an =
addressing./*____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>The IGP drafts covers the =
advertisement of the B and N<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>parts of<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>the locally configured locator on =
the node via<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; IGPs. On =
the<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>receiver side, the IGP may not =
really do much with<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; this<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>information, however it enables =
propagation of this<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>information<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>from all nodes in the network to =
be advertised out<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; via =
BGP-LS<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>(or other mechanisms) as part of =
the topology<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; feed. =
Once<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US>this =
is<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>part of the topology feed, it =
enables use-cases on<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>controllers<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>to perform network wide validation =
of the SRv6 SID<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; block<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>provisioning and can also help in =
automation of<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; the =
security<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>aspects described =
in<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; <a =
href=3D"https://tools.ietf.org/html/draft-ietf-6man-segment-routing-heade=
r-26#section-5____"><span =
style=3D'color:windowtext;text-decoration:none'>https://tools.ietf.org/ht=
ml/draft-ietf-6man-segment-routing-header-26#section-5____</span></a><o:p=
></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>[CB] If an ISIS speaker is not =
expected to do anything<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
with B<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US>and =
N,<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>then I think the text =
in<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
draft-ietf-lsr-isis-srv6-extensions<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>needs<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>to clarify this.</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> I have a similar observation about =
Fun.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>Length and<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Arg. Length in the SRv6 SID =
Structure Sub-Sub-TLV . <o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; As =
far<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US>as I =
can<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>tell, none of the endpoint =
behaviors that are currently<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>specified to<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>be carried in ISIS End, End.X, and =
LAN End.X SIDs sub-TLVs<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US>uses =
an<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Argument, so there is never a case =
where an SRv6 SID<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
Structure<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Sub-Sub-TLV should have a non-zero =
value for Arg.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; Length. =
What<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>should an ISIS speaker do if it =
receives a non-zero<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; value of =
the<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Arg. Length for an endpoint =
behavior that doesn't use an<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>argument?<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Are there any use cases envisioned =
where an ISIS<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; speaker needs =
to<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>know the Arg. Length ? =
____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*/[KT] The behaviors currently =
listed in the draft do<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; not =
have an<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>argument nor is the use of B and N =
required for them.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; We =
cannot<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>preclude a future use-case or =
extension where such<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
behaviors<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>introduced are also applicable to =
ISIS. So IMHO ruling<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; such<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>aspects<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>out might not be the right thing =
to do from a protocol<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>extensibility<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>perspective.____/*<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*/__ __/*<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>*/Thanks,____/*<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>*/Ketan/*____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>__ __<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>Thanks,____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Ketan____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*From:*Chris Bowers =
&lt;chrisbowers.ietf@gmail.com<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:chrisbowers.ietf@gmail.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:chrisbowers.ietf@g=
mail.com</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:chrisbowers.ietf@gmail.com<o:p></o:p></span></p><=
p class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:chrisbowers.ietf@gmail.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:chrisbowers.ietf@g=
mail.com</span></a>&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:chrisbowers.ietf@gmail.com<o:p></o:p></span></p><=
p class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:chrisbowers.ietf@gmail.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:chrisbowers.ietf@g=
mail.com</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:chrisbowers.ietf@gmail.com<o:p></o:p></span></p><=
p class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:chrisbowers.ietf@gmail.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:chrisbowers.ietf@g=
mail.com</span></a>&gt;&gt;&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*Sent:* 02 March 2020 =
23:39<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*To:* Ketan Talaulikar (ketant) =
&lt;ketant@cisco.com<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; &lt;<a =
href=3D"mailto:ketant@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ketant@cisco.com</=
span></a>&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;<a =
href=3D"mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ketant@cisco.com =
&lt;mailto:ketant@cisco.com</span></a>&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>&lt;<a =
href=3D"mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ketant@cisco.com =
&lt;mailto:ketant@cisco.com</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a =
href=3D"mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ketant@cisco.com =
&lt;mailto:ketant@cisco.com</span></a>&gt;&gt;&gt;&gt;<o:p></o:p></span><=
/p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*Cc:* Ketan Talaulikar =
(ketant)<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;ketant=3D40cisco.com@dmarc.ietf.org<o:p></o:p></span></p=
><p class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:40cisco.com@dmarc.ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:40cisco.com@dmarc.=
ietf.org</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:40cisco.com@dmarc.ietf.org<o:p></o:p></span></p><=
p class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:40cisco.com@dmarc.ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:40cisco.com@dmarc.=
ietf.org</span></a>&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&gt;</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:40cisco..com@dmarc.ietf.org<o:p></o:p></span></p>=
<p class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:40cisco..com@dmarc.ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:40cisco..com@dmarc=
.ietf.org</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:40cisco..com@dmarc.ietf.org<o:p></o:p></span></p>=
<p class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:40cisco..com@dmarc.ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:40cisco..com@dmarc=
.ietf.org</span></a>&gt;&gt;&gt;&gt;; <a =
href=3D"mailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>lsr@ietf.org</span></a><o=
:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; &lt;<a =
href=3D"mailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr@ietf.org</span=
></a>&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;<a =
href=3D"mailto:lsr@ietf.org%20%3cmailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr@ietf.org =
&lt;mailto:lsr@ietf.org</span></a>&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>&lt;<a =
href=3D"mailto:lsr@ietf.org%20%3cmailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr@ietf.org =
&lt;mailto:lsr@ietf.org</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:lsr@ietf.org%20%3cmailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr@ietf.org =
&lt;mailto:lsr@ietf.org</span></a>&gt;&gt;&gt;; SPRING =
WG<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US>List =
&lt;<a href=3D"mailto:spring@ietf.org%20%3cmailto:spring@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>spring@ietf.org =
&lt;mailto:spring@ietf.org</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:spring@ietf.org%20%3cmailto:spring@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:spring@ietf.org =
&lt;mailto:spring@ietf.org</span></a>&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>&lt;<a =
href=3D"mailto:spring@ietf.org%20%3cmailto:spring@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:spring@ietf.org =
&lt;mailto:spring@ietf.org</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:spring@ietf.org%20%3cmailto:spring@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:spring@ietf.org =
&lt;mailto:spring@ietf.org</span></a>&gt;&gt;&gt;&gt;;<o:p></o:p></span><=
/p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>draft-ietf-spring-srv6-network-programming<o:p></o:p></span>=
</p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;draft-ietf-spring-srv6-network-programming@ietf.org<o:p>=
</o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; &lt;<a =
href=3D"mailto:draft-ietf-spring-srv6-network-programming@ietf.org"><span=
 =
style=3D'color:windowtext;text-decoration:none'>mailto:draft-ietf-spring-=
srv6-network-programming@ietf.org</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:draft-ietf-spring-srv6-network-programming@ietf.o=
rg<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; &lt;<a =
href=3D"mailto:draft-ietf-spring-srv6-network-programming@ietf.org"><span=
 =
style=3D'color:windowtext;text-decoration:none'>mailto:draft-ietf-spring-=
srv6-network-programming@ietf.org</span></a>&gt;&gt;<o:p></o:p></span></p=
><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:draft-ietf-spring-srv6-network-programming@ietf.o=
rg<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; &lt;<a =
href=3D"mailto:draft-ietf-spring-srv6-network-programming@ietf.org"><span=
 =
style=3D'color:windowtext;text-decoration:none'>mailto:draft-ietf-spring-=
srv6-network-programming@ietf.org</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:draft-ietf-spring-srv6-network-programming@ietf.o=
rg<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; &lt;<a =
href=3D"mailto:draft-ietf-spring-srv6-network-programming@ietf.org"><span=
 =
style=3D'color:windowtext;text-decoration:none'>mailto:draft-ietf-spring-=
srv6-network-programming@ietf.org</span></a>&gt;&gt;&gt;&gt;;<o:p></o:p><=
/span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Peter Psenak (ppsenak) =
&lt;ppsenak@cisco.com<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; &lt;<a =
href=3D"mailto:ppsenak@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ppsenak@cisco.com<=
/span></a>&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;<a =
href=3D"mailto:ppsenak@cisco.com%20%3cmailto:ppsenak@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ppsenak@cisco.com =
&lt;mailto:ppsenak@cisco.com</span></a>&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:ppsenak@cisco.com<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:ppsenak@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ppsenak@cisco.com<=
/span></a>&gt; &lt;mailto:ppsenak@cisco.com<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:ppsenak@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ppsenak@cisco.com<=
/span></a>&gt;&gt;&gt;&gt;;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>Bruno Decraene<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;bruno.decraene@orange.com<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:bruno.decraene@orange.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:bruno.decraene@ora=
nge.com</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:bruno.decraene@orange.com<o:p></o:p></span></p><p=
 class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:bruno.decraene@orange.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:bruno.decraene@ora=
nge.com</span></a>&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a =
href=3D"mailto:bruno.decraene@orange.com%20%3cmailto:bruno.decraene@orang=
e.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:bruno.decraene@ora=
nge.com =
&lt;mailto:bruno.decraene@orange.com</span></a>&gt;<o:p></o:p></span></p>=
<p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:bruno.decraene@orange.com<o:p></o:p></span></p><p=
 class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:bruno.decraene@orange.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:bruno.decraene@ora=
nge.com</span></a>&gt;&gt;&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*Subject:* Re: [Lsr] clarification =
of locator<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; block =
and<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>locator<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>node in =
draft-ietf-spring-srv6-network-programming and<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>draft-ietf-lsr-isis-srv6-extensions____<o:p></o:p></span></p=
><p class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&nbsp;&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> &gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Ketan,____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Based on current documents, =
allocating all SRv6<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
locators<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US>used =
in<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>a domain from a single block is =
optional.____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>However, assuming for the moment =
that a network<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; operator =
has<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>chosen to allocate all SRv6 =
locators used in a<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; domain from =
a<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>single block, so that there is a =
well-defined<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; value of =
B<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US>and =
N<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>across a domain, what is the use =
of having a<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; router =
advertise<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>its own understanding of these two =
values?</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> And<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
what is a<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>receiver supposed to do with this =
information?____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>Thanks,____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Chris____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>On Fri, Feb 28, 2020 at 8:23 =
AM<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;<a =
href=3D"mailto:bruno.decraene@orange.com%20%3cmailto:bruno.decraene@orang=
e.com"><span =
style=3D'color:windowtext;text-decoration:none'>bruno.decraene@orange.com=
 =
&lt;mailto:bruno.decraene@orange.com</span></a>&gt;<o:p></o:p></span></p>=
<p class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a =
href=3D"mailto:bruno.decraene@orange.com%20%3cmailto:bruno.decraene@orang=
e.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:bruno.decraene@ora=
nge.com =
&lt;mailto:bruno.decraene@orange.com</span></a>&gt;&gt;<o:p></o:p></span>=
</p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:bruno.decraene@orange.com<o:p></o:p></span></p><p=
 class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:bruno.decraene@orange.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:bruno.decraene@ora=
nge.com</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:bruno.decraene@orange.com<o:p></o:p></span></p><p=
 class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:bruno.decraene@orange.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:bruno.decraene@ora=
nge.com</span></a>&gt;&gt;&gt;&gt; wrote:____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Hi =
Ketan,____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Thanks fort the follow =
up.____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Clarification inline =
[Bruno]____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*From**:*Ketan Talaulikar =
(ketant)<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>[mailto:ketant@cisco.com =
&lt;mailto:ketant@cisco.com&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a =
href=3D"mailto:ketant@cisco.com%20%3cmailto:ketant@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ketant@cisco.com =
&lt;mailto:ketant@cisco.com</span></a>&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:ketant@cisco.com<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:ketant@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ketant@cisco.com</=
span></a>&gt; &lt;mailto:ketant@cisco.com<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:ketant@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ketant@cisco.com</=
span></a>&gt;&gt;&gt;]<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*Sent:* Friday, February 28, 2020 =
11:11 AM<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*To:* DECRAENE Bruno TGI/OLN; =
Ketan Talaulikar<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
(ketant);<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Chris =
Bowers<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*Cc:* <a =
href=3D"mailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>lsr@ietf.org</span></a> =
&lt;<a href=3D"mailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr@ietf.org</span=
></a>&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; &lt;<a =
href=3D"mailto:lsr@ietf.org%20%3cmailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr@ietf.org =
&lt;mailto:lsr@ietf.org</span></a>&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;<a =
href=3D"mailto:lsr@ietf.org%20%3cmailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr@ietf.org =
&lt;mailto:lsr@ietf.org</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:lsr@ietf.org%20%3cmailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr@ietf.org =
&lt;mailto:lsr@ietf.org</span></a>&gt;&gt;&gt;; SPRING WG =
List;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>draft-ietf-spring-srv6-network-programming;<o:p></o:p></span=
></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; Peter =
Psenak<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>(ppsenak)<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*Subject:* RE: [Lsr] clarification =
of locator<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; block =
and<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>locator node =
in<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>draft-ietf-spring-srv6-network-programming<o:p></o:p></span>=
</p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>and =
draft-ietf-lsr-isis-srv6-extensions____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Hi =
Bruno,____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>I believe the description and =
usage of Locator is<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US>very =
well<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>described and covered in the =
net-pgm draft as<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; also =
the<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>corresponding IGP extensions. Is =
the question<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; is =
more<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>about<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>the </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=9C</span><span =
lang=3DEN-US>block</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=9D</span><span lang=3DEN-US> =
part of it (what is not in the<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
block part<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US>is =
in<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>the node part as per the text in =
the net-pgm<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
draft)?____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>The </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=9C</span><span =
lang=3DEN-US>block</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=9D</span><span lang=3DEN-US> =
is again not a new thing. Please<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
check the<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>following:____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Under<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; <a =
href=3D"https://tools.ietf.org/html/draft-ietf-6man-segment-routing-heade=
r-26#section-5"><span =
style=3D'color:windowtext;text-decoration:none'>https://tools.ietf.org/ht=
ml/draft-ietf-6man-segment-routing-header-26#section-5</span></a><o:p></o=
:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;=E2=80=A6</span><span lang=3DEN-US> look for </span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>=E2=80=9C</span><span =
lang=3DEN-US>block</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=9D</span><span =
lang=3DEN-US>____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt; <a href=3D"https://tools.ietf.org/html/rfc8402#section-2"><span =
style=3D'color:windowtext;text-decoration:none'>https://tools.ietf.org/ht=
ml/rfc8402#section-2</span></a> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=A6</span><span lang=3DEN-US> =
look under<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>SRGB for =
SRv6____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>[Bruno]____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>To clarify, my question was not =
specific to<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=9C</span><span =
lang=3DEN-US>block</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=9D</span><span lang=3DEN-US> =
but<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>related to the usage, by the =
receiver, of the<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
following<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>piece of =
information:____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier =
New"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span lang=3DEN-US> LB =
Length: SRv6 SID Locator Block<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
length____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier =
New"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span lang=3DEN-US> LN =
Length: SRv6 SID Locator Node length____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier =
New"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span lang=3DEN-US> Fun. =
Length: SRv6 SID Function length____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier =
New"'>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span lang=3DEN-US> Arg. =
Length: SRv6 SID Arguments length____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>So perhaps I don</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>=E2=80=99</span><span =
lang=3DEN-US>t get Chris</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=99</span><span lang=3DEN-US>s =
point and would<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; wait<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US>for =
him<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>to =
clarify.____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>[Bruno] I</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>=E2=80=99</span><span =
lang=3DEN-US>ll leave this to Chris.____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>Thanks,____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Ketan____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*From:*Lsr =
&lt;lsr-bounces@ietf.org<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:lsr-bounces@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr-bounces@ietf.o=
rg</span></a>&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;<a =
href=3D"mailto:lsr-bounces@ietf.org%20%3cmailto:lsr-bounces@ietf.org"><sp=
an =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr-bounces@ietf.o=
rg =
&lt;mailto:lsr-bounces@ietf.org</span></a>&gt;&gt;<o:p></o:p></span></p><=
p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:lsr-bounces@ietf.org<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:lsr-bounces@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr-bounces@ietf.o=
rg</span></a>&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;<a =
href=3D"mailto:lsr-bounces@ietf.org%20%3cmailto:lsr-bounces@ietf.org"><sp=
an =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr-bounces@ietf.o=
rg =
&lt;mailto:lsr-bounces@ietf.org</span></a>&gt;&gt;&gt;&gt;<o:p></o:p></sp=
an></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; *On Behalf =
Of<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US><a =
href=3D"mailto:*bruno.decraene@orange.com"><span =
style=3D'color:windowtext;text-decoration:none'>*bruno.decraene@orange.co=
m</span></a><o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; &lt;<a =
href=3D"mailto:bruno.decraene@orange.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:bruno.decraene@ora=
nge.com</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:bruno.decraene@orange.com<o:p></o:p></span></p><p=
 class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:bruno.decraene@orange.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:bruno.decraene@ora=
nge.com</span></a>&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a =
href=3D"mailto:bruno.decraene@orange.com%20%3cmailto:bruno.decraene@orang=
e.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:bruno.decraene@ora=
nge.com =
&lt;mailto:bruno.decraene@orange.com</span></a>&gt;<o:p></o:p></span></p>=
<p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:bruno.decraene@orange.com<o:p></o:p></span></p><p=
 class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:bruno.decraene@orange.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:bruno.decraene@ora=
nge.com</span></a>&gt;&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*Sent:* 28 February 2020 =
14:34<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*To:* Ketan Talaulikar =
(ketant)<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;ketant=3D40cisco.com@dmarc.ietf.org<o:p></o:p></span></p=
><p class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:40cisco.com@dmarc.ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:40cisco.com@dmarc.=
ietf.org</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:40cisco.com@dmarc.ietf.org<o:p></o:p></span></p><=
p class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:40cisco.com@dmarc.ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:40cisco.com@dmarc.=
ietf.org</span></a>&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:40cisco..com@dmarc.ietf.org<o:p></o:p></span></p>=
<p class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:40cisco..com@dmarc.ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:40cisco..com@dmarc=
.ietf.org</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:40cisco..com@dmarc.ietf.org<o:p></o:p></span></p>=
<p class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:40cisco..com@dmarc.ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:40cisco..com@dmarc=
.ietf.org</span></a>&gt;&gt;&gt;&gt;; Chris =
Bowers<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;chrisbowers.ietf@gmail.com<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:chrisbowers.ietf@gmail.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:chrisbowers.ietf@g=
mail.com</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt; =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&gt;</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:chrisbowers.ietf@gmail.com<o:p></o:p></span></p><=
p class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:chrisbowers.ietf@gmail.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:chrisbowers.ietf@g=
mail.com</span></a>&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:chrisbowers.ietf@gmail.com<o:p></o:p></span></p><=
p class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:chrisbowers.ietf@gmail.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:chrisbowers.ietf@g=
mail.com</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;mailto:chrisbowers.ietf@gmail.com<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:chrisbowers.ietf@gmail.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:chrisbowers.ietf@g=
mail.com</span></a>&gt;&gt;&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*Cc:* <a =
href=3D"mailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>lsr@ietf.org</span></a> =
&lt;<a href=3D"mailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr@ietf.org</span=
></a>&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; &lt;<a =
href=3D"mailto:lsr@ietf.org%20%3cmailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr@ietf.org =
&lt;mailto:lsr@ietf.org</span></a>&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;<a =
href=3D"mailto:lsr@ietf.org%20%3cmailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr@ietf.org =
&lt;mailto:lsr@ietf.org</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:lsr@ietf.org%20%3cmailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr@ietf.org =
&lt;mailto:lsr@ietf.org</span></a>&gt;&gt;&gt;; SPRING WG =
List<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>&lt;<a =
href=3D"mailto:spring@ietf.org%20%3cmailto:spring@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>spring@ietf.org =
&lt;mailto:spring@ietf.org</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:spring@ietf.org%20%3cmailto:spring@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:spring@ietf.org =
&lt;mailto:spring@ietf.org</span></a>&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;<a =
href=3D"mailto:spring@ietf.org%20%3cmailto:spring@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:spring@ietf.org =
&lt;mailto:spring@ietf.org</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:spring@ietf.org%20%3cmailto:spring@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:spring@ietf.org =
&lt;mailto:spring@ietf.org</span></a>&gt;&gt;&gt;&gt;;<o:p></o:p></span><=
/p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>draft-ietf-spring-srv6-network-programming<o:p></o:p></span>=
</p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;draft-ietf-spring-srv6-network-programming@ietf.org<o:p>=
</o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; &lt;<a =
href=3D"mailto:draft-ietf-spring-srv6-network-programming@ietf.org"><span=
 =
style=3D'color:windowtext;text-decoration:none'>mailto:draft-ietf-spring-=
srv6-network-programming@ietf.org</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
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style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:draft-ietf-spring-srv6-network-programming@ietf.o=
rg<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; &lt;<a =
href=3D"mailto:draft-ietf-spring-srv6-network-programming@ietf.org"><span=
 =
style=3D'color:windowtext;text-decoration:none'>mailto:draft-ietf-spring-=
srv6-network-programming@ietf.org</span></a>&gt;&gt;<o:p></o:p></span></p=
><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
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lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
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style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
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lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
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style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:draft-ietf-spring-srv6-network-programming@ietf.o=
rg<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; &lt;<a =
href=3D"mailto:draft-ietf-spring-srv6-network-programming@ietf.org"><span=
 =
style=3D'color:windowtext;text-decoration:none'>mailto:draft-ietf-spring-=
srv6-network-programming@ietf.org</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:draft-ietf-spring-srv6-network-programming@ietf.o=
rg<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; &lt;<a =
href=3D"mailto:draft-ietf-spring-srv6-network-programming@ietf.org"><span=
 =
style=3D'color:windowtext;text-decoration:none'>mailto:draft-ietf-spring-=
srv6-network-programming@ietf.org</span></a>&gt;&gt;&gt;&gt;;<o:p></o:p><=
/span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Peter Psenak (ppsenak) =
&lt;ppsenak@cisco.com<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; &lt;<a =
href=3D"mailto:ppsenak@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ppsenak@cisco.com<=
/span></a>&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;<a =
href=3D"mailto:ppsenak@cisco.com%20%3cmailto:ppsenak@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ppsenak@cisco.com =
&lt;mailto:ppsenak@cisco.com</span></a>&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
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style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
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style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
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style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
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style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:ppsenak@cisco.com<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:ppsenak@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ppsenak@cisco.com<=
/span></a>&gt; &lt;mailto:ppsenak@cisco.com<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:ppsenak@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ppsenak@cisco.com<=
/span></a>&gt;&gt;&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
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style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
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style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*Subject:* Re: [Lsr] clarification =
of locator<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; block =
and<o:p></o:p></span></p><p class=3DMsoPlainText><span =
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lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
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style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
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style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
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style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
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style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>locator node =
in<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>draft-ietf-spring-srv6-network-programming<o:p></o:p></span>=
</p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
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style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
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style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>and =
draft-ietf-lsr-isis-srv6-extensions____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
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style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
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lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
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style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
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style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
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</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
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lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
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style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
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</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Hi =
Ketan,____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
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style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
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style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
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style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
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New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
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class=3DMsoPlainText><span =
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lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*From:*Lsr =
[mailto:lsr-bounces@ietf.org<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:lsr-bounces@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr-bounces@ietf.o=
rg</span></a>&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;<a =
href=3D"mailto:lsr-bounces@ietf.org%20%3cmailto:lsr-bounces@ietf.org"><sp=
an =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr-bounces@ietf.o=
rg =
&lt;mailto:lsr-bounces@ietf.org</span></a>&gt;&gt;]<o:p></o:p></span></p>=
<p class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
*On Behalf Of<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*Ketan Talaulikar =
(ketant)<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*Sent:* Friday, February 28, 2020 =
6:30 AM____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Hi =
Chris,____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>I agree with Peter and I would =
suggest to drop<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; LSR =
since<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>this is not a protocol specific =
thing.____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>I believe the text =
in<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>draft-ietf-spring-srv6-network-programming =
clears<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US>says =
what<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>locator block and locator node =
are. What more<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
details<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US>do =
you<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>think are =
required?____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>[Bruno] Speaking as an individual, =
the draft could<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>possibly<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>clarify the usage of these =
information/fields<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; by the<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>receiver. Possibly using the same =
name/term (e.g.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US>SRv6 =
SID<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Locator Block length) to ease the =
references<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; between =
both<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>drafts.____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>Thanks,____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>--Bruno____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>Thanks,____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Ketan____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*From:*Lsr =
&lt;lsr-bounces@ietf.org<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:lsr-bounces@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr-bounces@ietf.o=
rg</span></a>&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;<a =
href=3D"mailto:lsr-bounces@ietf.org%20%3cmailto:lsr-bounces@ietf.org"><sp=
an =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr-bounces@ietf.o=
rg =
&lt;mailto:lsr-bounces@ietf.org</span></a>&gt;&gt;<o:p></o:p></span></p><=
p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:lsr-bounces@ietf.org<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:lsr-bounces@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr-bounces@ietf.o=
rg</span></a>&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;<a =
href=3D"mailto:lsr-bounces@ietf.org%20%3cmailto:lsr-bounces@ietf.org"><sp=
an =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr-bounces@ietf.o=
rg =
&lt;mailto:lsr-bounces@ietf.org</span></a>&gt;&gt;&gt;&gt;<o:p></o:p></sp=
an></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; *On Behalf Of *Chris =
Bowers<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*Sent:* 27 February 2020 =
22:46<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*To:* <a =
href=3D"mailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>lsr@ietf.org</span></a> =
&lt;<a href=3D"mailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr@ietf.org</span=
></a>&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; &lt;<a =
href=3D"mailto:lsr@ietf.org%20%3cmailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr@ietf.org =
&lt;mailto:lsr@ietf.org</span></a>&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;<a =
href=3D"mailto:lsr@ietf.org%20%3cmailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr@ietf.org =
&lt;mailto:lsr@ietf.org</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:lsr@ietf.org%20%3cmailto:lsr@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:lsr@ietf.org =
&lt;mailto:lsr@ietf.org</span></a>&gt;&gt;&gt;; SPRING WG =
List<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>&lt;<a =
href=3D"mailto:spring@ietf.org%20%3cmailto:spring@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>spring@ietf.org =
&lt;mailto:spring@ietf.org</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:spring@ietf.org%20%3cmailto:spring@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:spring@ietf.org =
&lt;mailto:spring@ietf.org</span></a>&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;<a =
href=3D"mailto:spring@ietf.org%20%3cmailto:spring@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:spring@ietf.org =
&lt;mailto:spring@ietf.org</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:spring@ietf.org%20%3cmailto:spring@ietf.org"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:spring@ietf.org =
&lt;mailto:spring@ietf.org</span></a>&gt;&gt;&gt;&gt;<o:p></o:p></span></=
p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*Cc:* Peter Psenak =
(ppsenak)<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; &lt;<a =
href=3D"mailto:ppsenak@cisco.com%20%3cmailto:ppsenak@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>ppsenak@cisco.com =
&lt;mailto:ppsenak@cisco.com</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;<a =
href=3D"mailto:ppsenak@cisco.com%20%3cmailto:ppsenak@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ppsenak@cisco.com =
&lt;mailto:ppsenak@cisco.com</span></a>&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;mailto:ppsenak@cisco.com<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:ppsenak@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ppsenak@cisco.com<=
/span></a>&gt; &lt;mailto:ppsenak@cisco.com<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a href=3D"mailto:ppsenak@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ppsenak@cisco.com<=
/span></a>&gt;&gt;&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>*Subject:* [Lsr] clarification of =
locator<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; block =
and<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>locator<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>node in<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
draft-ietf-spring-srv6-network-programming and<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>draft-ietf-lsr-isis-srv6-extensions____<o:p></o:p></span></p=
><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>SPRING and LSR =
WGs,____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>I think that we need a much more =
detailed<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
description<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US>of =
the<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>locator block and locator node in =
either<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>draft-ietf-spring-srv6-network-programming =
or<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>draft-ietf-lsr-isis-srv6-extensions.</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> See<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; original =
email<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>below.____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&gt;</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>Thanks,____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Chris____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>On Thu, Feb 27, 2020 at 11:08 AM =
Peter Psenak<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>&lt;<a =
href=3D"mailto:ppsenak@cisco.com%20%3cmailto:ppsenak@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>ppsenak@cisco.com =
&lt;mailto:ppsenak@cisco.com</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a =
href=3D"mailto:ppsenak@cisco.com%20%3cmailto:ppsenak@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ppsenak@cisco.com =
&lt;mailto:ppsenak@cisco.com</span></a>&gt;&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>&lt;<a =
href=3D"mailto:ppsenak@cisco.com%20%3cmailto:ppsenak@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ppsenak@cisco.com =
&lt;mailto:ppsenak@cisco.com</span></a>&gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
&lt;<a =
href=3D"mailto:ppsenak@cisco.com%20%3cmailto:ppsenak@cisco.com"><span =
style=3D'color:windowtext;text-decoration:none'>mailto:ppsenak@cisco.com =
&lt;mailto:ppsenak@cisco.com</span></a>&gt;&gt;&gt;&gt; =
wrote:____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Hi Chris,<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>On 27/02/2020 17:54, Chris Bowers =
wrote:<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> &gt; LSR =
WG,<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> &gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> &gt; Section 9 =
of<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>draft-ietf-lsr-isis-srv6-extensions-05<o:p></o:p></span></p>=
<p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>defines the</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> SRv6<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> &gt; SID Structure Sub-Sub-TLV. =
In<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; particular, =
it<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>defines<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>encoding for =
the<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> &gt; locator block length and the =
locator<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; node =
length.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>The text refers =
to<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> &gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
[I-D.ietf-spring-srv6-network-programming] for =
the<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>definition of =
these<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> &gt; =
concepts.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> &gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> &gt; As far as I can tell, the =
only reference to<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>locator<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>block and =
locator<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> &gt; node =
in<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>draft-ietf-spring-srv6-network-programming-10<o:p></o:p></sp=
an></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>is section =
3.1<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> &gt; which has the following =
text:<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> &gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> &gt;</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US>A =
locator may be represented as B:N<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
where B is<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>the SRv6 SID =
block<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> &gt;</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>(IPv6 subnet allocated for SRv6<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
SIDs by the<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>operator) and N is =
the<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> &gt;</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>identifier of the parent node<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>instantiating the<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>SID...<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> &gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> &gt; I think that we need a much =
more detailed<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>description<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>of the =
locator<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> &gt; block and locator =
node.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>sure, but that would be in =
the<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; <o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>draft-ietf-spring-srv6-network-programming-10, not =
in<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>draft-ietf-lsr-isis-srv6-extensions, =
as<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; these =
are<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US>not =
a<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>protocol<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>specific =
constructs.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>thanks,<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Peter<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> &gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> &gt; =
Thanks,<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> &gt;<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> &gt; =
Chris<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> &gt; ____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&gt;&nbsp;&nbsp;&nbsp;&nbsp; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>____________________________________________________________=
_________________________________________________________________<o:p></o=
:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Ce message et ses pieces jointes =
peuvent<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; contenir =
des<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>informations confidentielles ou =
privilegiees et ne<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>doivent donc____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>pas etre diffuses, exploites ou =
copies sans<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>autorisation. Si<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>vous avez recu ce message par =
erreur, veuillez le<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>signaler____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>a l'expediteur et le detruire =
ainsi que les pieces<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>jointes.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Les messages electroniques etant =
susceptibles<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>d'alteration,____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Orange decline toute =
responsabilite si ce<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; message a =
ete<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>altere, deforme ou falsifie. =
Merci.____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>This message and its attachments =
may contain<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>confidential or<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>privileged information that may be =
protected<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; by =
law;____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>they should not be distributed, =
used or copied<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
without<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>authorisation.____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>If you have received this email in =
error, please<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>notify the<o:p></o:p></span></p><p =
class=3DMsoPlainText><span lang=3DEN-US>&gt;&nbsp; =
&nbsp;&nbsp;&nbsp;&nbsp;&gt;</span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>sender and delete this message and =
its<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
attachments.____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>As emails may be altered, Orange =
is not liable for<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>messages<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>that have been modified, changed =
or falsified.____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Thank =
you.____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =
&gt;&nbsp;&nbsp;&nbsp;&nbsp; <o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>____________________________________________________________=
_________________________________________________________________<o:p></o=
:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Ce message et ses pieces jointes =
peuvent<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; contenir =
des<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>informations confidentielles ou =
privilegiees et ne<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>doivent donc____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>pas etre diffuses, exploites ou =
copies sans<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>autorisation. Si<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>vous avez recu ce message par =
erreur, veuillez le<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>signaler____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>a l'expediteur et le detruire =
ainsi que les pieces<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>jointes.<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Les messages electroniques etant =
susceptibles<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>d'alteration,____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>Orange decline toute =
responsabilite si ce<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; message a =
ete<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>altere, deforme ou falsifie. =
Merci.____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>This message and its attachments =
may contain<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US>confidential or<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>privileged information that may be =
protected<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; by =
law;____<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US>they should not be distributed, =
used or copied<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp; =
without<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
</span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span =
lang=3DEN-US>authorisation.____<o:p></o:p></span></p><p =
class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
lang=3DEN-US> </span><span lang=3DEN-US style=3D'font-family:"Courier =
New"'>&nbsp;</span><span lang=3DEN-US> </span><span lang=3DEN-US =
style=3D'font-family:"Courier New"'>&nbsp;</span><span lang=3DEN-US> =
&gt;<o:p></o:p></span></p><p class=3DMsoPlainText><span =
lang=3DEN-US>&gt;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &gt;</span><span =
lang=3DEN-US style=3D'font-family:"Courier New"'>&nbsp;</span><span =
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Subject: Re: [Lsr] AD Review of draft-ietf-ospf-mpls-elc-12
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Hi Alvaro,

thanks for your comments, please see inline:

On 29/02/2020 06:03, Alvaro Retana wrote:
> Dear authors:
> 
> This is my review of draft-ietf-ospf-mpls-elc-12.  I reviewed this
> document alongside draft-ietf-isis-mpls-elc-10, so many comments are
> the same/similar.  Thank you for the work in both of them!
> 
> I will progress both documents together, so I will wait for both of
> them to address my comments before starting their IETF LC.
> 
> Thanks!!
> 
> Alvaro.

[Line numbers from idnits.]

...
14	  Signaling Entropy Label Capability and Entropy Readable Label-stack
15	                            Depth Using OSPF

[minor] s/Label-stack/Label

##PP
done

16	                      draft-ietf-ospf-mpls-elc-12

18	Abstract

20	   Multiprotocol Label Switching (MPLS) has defined a mechanism to load-
21	   balance traffic flows using Entropy Labels (EL).  An ingress Label
22	   Switching Router (LSR) cannot insert ELs for packets going into a
23	   given tunnel unless an egress LSR has indicated via signaling that it
24	   has the capability to process ELs, referred to as Entropy Label
25	   Capability (ELC), on that tunnel.  In addition, it would be useful
26	   for ingress LSRs to know each LSR's capability of reading the maximum
27	   label stack depth and performing EL-based load-balancing, referred to
28	   as Entropy Readable Label Depth (ERLD).  This document defines a
29	   mechanism to signal these two capabilities using OSPF and OSPFv3.
30	   These mechanism is particularly useful in the environment where
31	   Segment Routing (SR) is used, where label advertisements are done via
32	   protocols like OSPF and OSPFv3.

[nit] s/given tunnel/given Label Switched Path (LSP)

[nit] s/as Entropy Label Capability/as the Entropy Label Capability

[nit] s/capability of reading/capability for reading

[minor] s/OSPF and OSPFv3/OSPFv2 and OSPFv3/g


##PP
all done

[minor] Add some text in the Introduction pointing at the generic use
of "OSPF" to mean both OSPFv2 and OSPFv3.

##PP
added it to the Terminology section.

[minor] "protocols like OSPF..."  That last sentence sounds as if
there were other options; for example advertise labels with IS-IS and
then use the extensions here.  It's just a minor point, but I think
that maybe that last sentence is not needed.

##PP
removed


...
83	1.  Introduction
...
96	   In addition, in the cases where stacked LSPs are used for whatever
97	   reasons (e.g., SR-MPLS [I-D.ietf-spring-segment-routing-mpls]), it
98	   would be useful for ingress LSRs to know each intermediate LSR's
99	   capability of reading the maximum label stack depth and performing
100	   EL-based load-balancing.  This capability, referred to as Entropy
101	   Readable Label Depth (ERLD) as defined in
102	   [I-D.ietf-mpls-spring-entropy-label] may be used by ingress LSRs to
103	   determine the position of the EL label in the stack, and whether it's
104	   necessary to insert multiple ELs at different positions in the label
105	   stack.

[minor] s/stacked LSPs/LSPs
I'm assuming there's no special significance of "stacked" in this
case, as this is the only place in the document that it is used.

##PP
removed it

[nit] s/in the cases where LSPs are used for whatever reasons/in cases
where LSPs are used

##PP
done


107	2.  Terminology

109	   This document makes use of the terms defined in [RFC6790], [RFC7770]
110	   and [I-D.ietf-mpls-spring-entropy-label].

[minor] I'm not sure why rfc7770 is referenced here; what terminology
is needed from it?

##removed


112	   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
113	   "SHOULD", "SHOULD NOT", "RECOMMENDED", "NOT RECOMMENDED", "MAY", and
114	   "OPTIONAL" in this document are to be interpreted as described in
115	   [BCP14] [RFC2119] [RFC8174] when, and only when, they appear in all
116	   capitals, as shown here.

[major] s/[BCP14]/BCP 14

##PP
done


118	3.  Advertising ELC Using OSPF

120	   Even though ELC is a property of the node, in some cases it is
121	   advantageous to associate and advertise the ELC with the prefix.  In
122	   multi-area networks, routers may not know the identity of the prefix
123	   originator in a remote area, or may not know the capabilities of such
124	   originator.  Similarly, in a multi domain network, the identity of
125	   the prefix originator and its capabilities may not be known to the
126	   ingress LSR.

[nit] s/with the prefix/with a prefix

##PP
fixed

[minor] Is there a difference that are you trying to highlight between
multi-area and multi-domain?  The last two sentences seem redundant to
me; using "domain" should be enough.


##PP
Multi-area and multi-domain are two different cases. I believe it is
important to keep both in the text. (Agreed during the ISIS draft review)


128	   If a router has multiple line cards, the router MUST NOT announce ELC
129	   unless all of its line-cards are capable of processing ELs.

131	   If the router supports ELs on all of its line cards, it SHOULD
132	   advertise the ELC with every local host prefix it advertises in OSPF.

[major] From a general router architecture point of view, I understand
what you mean by line-card.  But, strictly speaking from a
specification point of view, what is a line-card?  Would using
"interface" instead be an acceptable generalization?

##PP
changed to "interface"


[major] "it SHOULD advertise the ELC for every local host prefix"  If
ELs are supported in all the interfaces, when would a router not set
the ELC?  IOW, why is "MUST" not used instead of "SHOULD"?


##PP
advertising ELC is not a MUST. It's an optional information that the
originator should advertise, but if it is not, it is not going to break
anything really. (agreed during the ISIS draft review)


[major/related] The two paragraphs seem to be redundant -- I think
that only the second one is needed; suggestion (assuming my
interpretation of the questions above):


##PP
if we only keep the second sentence, the reader may not know what to do
in case where some interfaces do not support ELC. I believe it is good
to keep both. (agreed during the ISIS draft review)


    If a router supports ELs on all of its interfaces, it MUST set the 
E-flag
    (ELC Flag) for every attached prefix it advertises.


134	   When an OSPF Area Border Router (ABR) advertises the prefix to the
135	   connected area based on the intra-area or inter-area prefix that is
136	   reachable in some other area, it MUST preserve the ELC signalling for
137	   such prefix.

[] Suggestion>

    When an OSPF Area Border Router (ABR) distributes information between
    connected areas it MUST preserve the ELC setting

##PP
done


139	   When an OSPF Autonomous System Boundary Router (ASBR) redistributes
140	   the prefix from another instance of the OSPF or from some other
141	   protocol, it SHOULD preserve the ELC signaling for the prefix.  The
142	   exact mechanism used to exchange ELC between protocol instances on
143	   the ASBR is outside of the scope of this document and is
144	   implementation specific.

[nit] s/redistributes the prefix/redistributes a prefix

##PP
done

[minor] s/ELC signaling/ELC setting

[nit] s/ and is implementation specific./.

##PP
done


...
156	3.2.  Advertising ELC Using OSPFv3

158	   [RFC5340] defines the OSPFv3 PrefixOptions that are advertised along
159	   with the prefix.  A new bit in the OSPFV3 PrefixOptions is used to
160	   signal the ELC for the prefix:

[minor] s/[RFC5340] defines the OSPFv3 PrefixOptions that are
advertised along with the prefix./[RFC5340] defines the OSPFv3
PrefixOptions field to indicate capabilities associated with a prefix.

##PP
done

[nit] s/OSPFV3 PrefixOptions/OSPFv3 PrefixOptions field

##PP
done


...
165	4.  Advertising ERLD Using OSPF

[major] draft-ietf-mpls-spring-entropy-label says that "To advertise
an ERLD value, a SPRING router:  MUST be entropy label capable".  This
requirement must be translated to this document so that the ERLD is
only advertised if the ELC is also advertised.  I'm assuming that the
ERLD should be ignored if the ELC is not advertised -- but that should
be explicitly defined as well.  If the ELC is advertised, but the ERLD
isn't, what value should be assumed, 0?

##PP
I have resolved this the same way we did during the ISIS draft review.


167	   A new MSD (Maximum SID Depth) type of the Node MSD sub-TLV [RFC8476],
168	   called ERLD is defined to advertise the ERLD of a given router.  The
169	   scope of the advertisement depends on the application.

171	   Assignment of a MSD-Type for ERLD is defined in
172	   [I-D.ietf-isis-mpls-elc].

[minor] Instead of the last two paragraphs:

    The ERLD is advertised in a Node MSD sub-TLV [RFC8476] using the 
ERLD-MSD
    type defined in [I-D.ietf-isis-mpls-elc].

##PP
done


...
181	5.  Signaling ELC and ERLD in BGP-LS
...
186	   The ELC Flag included in the OSPFv2 Extended Prefix TLV and the
187	   OSPFv3 PrefixOptions, as defined in Section 3, is advertised using
188	   the Prefix Attribute Flags TLV (TLV 1170) of the BGP-LS IPv4/IPv6
189	   Prefix NLRI Attribute as defined in section 2.3.2 of
190	   [I-D.ietf-idr-bgp-ls-segment-routing-ext].

[nit] Suggestion>

    The ELC is advertised using the Prefix Attribute Flags TLV as defined in
    [I-D.ietf-idr-bgp-ls-segment-routing-ext].

##PP
done


192	   The ERLD MSD-type introduced for OSPF in Section 4 is advertised
193	   using the Node MSD TLV (TLV 266) of the BGP-LS Node NLRI Attribute as
194	   defined in section 3 of [I-D.ietf-idr-bgp-ls-segment-routing-msd].

[nit] Suggestion>

    The ERLD-MSD is advertised using the Node MSD TLV as defined in
    [I-D.ietf-idr-bgp-ls-segment-routing-msd].

##PP
done


196	6.  Acknowledgements

[major] Move this section to just before the References.


##PP
done

...
202	7.  IANA Considerations

204	   This document requests IANA to allocate one flag from the OSPFv2
205	   Extended Prefix TLV Flags registry:

207	      0x20 - E-Flag (ELC Flag)

209	   This document requests IANA to allocate one flag from the OSPFv3
210	   Prefix Options registry:

212	      0x04 - E-Flag (ELC Flag)

[major] IANA has already assigned the values.  Suggestion>

    Early allocation has been done by IANA for this document as follows:

    - Flag 0x20 in the OSPFv2 Extended Prefix TLV Flags registry has been
    assigned to the E-Flag (ELC Flag).  IANA is asked to update the 
registry to
    reflect the name used in this document: E-Flag (ELC Flag).

    - Bit 0x04 in the "OSPFv3 Prefix Options (8 bits)" registry has been
    assigned to the E-Flag (ELC Flag).  IANA is asked to update the 
registry to
    reflect the name used in this document: E-Flag (ELC Flag).

##PP
done


214	8.  Security Considerations

216	   The security considerations as described in [RFC7770] and
217	   [I-D.ietf-mpls-spring-entropy-label] are applicable to this document.

[minor] Why?  Also, I think that some of the other references should
be added here.  Suggestion:

    This document specifies the ability to advertise additional node
    capabilities using IS-IS and BGP-LS.  As such, the security 
considerations
    as described in [RFC5340], [RFC7770], [RFC7752], [RFC7684], [RFC8476],
    [I-D.ietf-idr-bgp-ls-segment-routing-ext],
    [I-D.ietf-idr-bgp-ls-segment-routing-msd] and
    [I-D.ietf-mpls-spring-entropy-label] are applicable to this document.

##PP
done


219	   Incorrectly setting the E flag (ELC capable) (during origination,
220	   inter-area advertisement or redistribution) may lead to black-holing
221	   of the traffic on the egress node.

[minor] s/E flag (ELC capable)/E flag

[major] "...may lead to black-holing of the traffic on the egress
node."  I'm not sure I understand how, but the ELC advertisement
should be accompanied by the ERLD-MSD -- see my questions at the
beginning of §4.

##PP
resolved as agreed for ISIS draft


223	   Incorrectly setting of the ERLD value may lead to poor load-balancing
224	   of the traffic.

[minor] "may lead to poor load-balancing"  If the ERLD is low, then
the traffic may not be load balanced at all...that is not "poor", it
is "0".

##PP
changed as agreed for ISIS draft

...
252	10.1.  Normative References

254	   [BCP14]    , <https://tools.ietf.org/html/bcp14>.

[major] A reference to BCP14 is not needed.  The ones to [RFC2119] and
[RFC8174] are enough.

#PP
removed

...
275	   [I-D.ietf-mpls-spring-entropy-label]
276	              Kini, S., Kompella, K., Sivabalan, S., Litkowski, S.,
277	              Shakir, R., and J. Tantsura, "Entropy label for SPRING
278	              tunnels", draft-ietf-mpls-spring-entropy-label-12 (work in
279	              progress), July 2018.

== Outdated reference: draft-ietf-mpls-spring-entropy-label has been
    published as RFC 8662\

##PP
done


281	   [I-D.ietf-spring-segment-routing-mpls]
282	              Bashandy, A., Filsfils, C., Previdi, S., Decraene, B.,
283	              Litkowski, S., and R. Shakir, "Segment Routing with MPLS
284	              data plane", draft-ietf-spring-segment-routing-mpls-22
285	              (work in progress), May 2019.

== Outdated reference: draft-ietf-spring-segment-routing-mpls has been
    published as RFC 8660

[minor] This reference can be Informative.

##PP
done

...
326	10.2.  Informative References

328	   [I-D.ietf-ospf-segment-routing-extensions]
329	              Psenak, P., Previdi, S., Filsfils, C., Gredler, H.,
330	              Shakir, R., Henderickx, W., and J. Tantsura, "OSPF
331	              Extensions for Segment Routing", draft-ietf-ospf-segment-
332	              routing-extensions-27 (work in progress), December 2018.

== Outdated reference: draft-ietf-ospf-segment-routing-extensions has been
    published as RFC 8665

##PP
done

thanks,
Peter

     [Lsr] AD Review of draft-ietf-ospf-mpls-elc-12  Alvaro Retana



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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Link State Routing WG of the IETF.

        Title           : Signaling Entropy Label Capability and Entropy Readable Label Depth Using OSPF
        Authors         : Xiaohu Xu
                          Sriganesh Kini
                          Peter Psenak
                          Clarence Filsfils
                          Stephane Litkowski
                          Matthew Bocci
	Filename        : draft-ietf-ospf-mpls-elc-13.txt
	Pages           : 9
	Date            : 2020-04-17

Abstract:
   Multiprotocol Label Switching (MPLS) has defined a mechanism to load-
   balance traffic flows using Entropy Labels (EL).  An ingress Label
   Switching Router (LSR) cannot insert ELs for packets going into a
   given Label Switched Path (LSP) unless an egress LSR has indicated
   via signaling that it has the capability to process ELs, referred to
   as the Entropy Label Capability (ELC), on that tunnel.  In addition,
   it would be useful for ingress LSRs to know each LSR's capability for
   reading the maximum label stack depth and performing EL-based load-
   balancing, referred to as Entropy Readable Label Depth (ERLD).  This
   document defines a mechanism to signal these two capabilities using
   OSPFv2 and OSPFv3.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-ospf-mpls-elc-13
https://datatracker.ietf.org/doc/html/draft-ietf-ospf-mpls-elc-13

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-ospf-mpls-elc-13


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/



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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "bruno.decraene@orange.com" <bruno.decraene@orange.com>
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Thread-Topic: Flow Control Discussion for IS-IS Flooding Speed
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Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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--_000_MW3PR11MB46198978E071B8C7E79770CEC1D90MW3PR11MB4619namp_
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Bruno -

Returning to this old thread...

The following is a generic description of how receive path for IS-IS PDUs f=
unctions today - based on examination of implementations on a variety of pl=
atforms from my employer. It is, for obvious reasons,  generic and intentio=
nally omits any discussion of implementation details.
But it is hopefully detailed enough to illustrate some of the challenges in=
 regards to providing real-time  accurate feedback to the control plane tha=
t could be used by a receiver based flow control mechanism.

Stage 1: Input Policing

As a first step, a policer operates at ingress to rate limit the number of =
packets which will be punted for local processing. This typically operates =
in an interface independent manner - limiting the total number of packets p=
er second across all interfaces.
The policer may rate limit different classes of packets or simply limit all=
 types of packets. A given platform may apply a limit specific to IS-IS PDU=
s or apply a limit to a class of packets (e.g., OSPF+BGP+IS-IS combined).

Stage 2: Punt Queue Shaping

Received packets are then placed in a queue for eventual transfer to the co=
ntrol plane. The number of queues varies. In some cases a single queue for =
all packet types is used. In other cases packets are placed on different qu=
eues based on packet classes.
Each queue is typically bounded to a maximum number of packets. As the queu=
e usage approaches a limit, shaping policies are applied to prioritize cert=
ain packet types over others.
An upper limit specific to IS-IS packets may be employed - or a limit may b=
e applied to a larger class of packet types of which IS-IS is only one of t=
he packet types in the class.

Stage 3: Transfer to control Plane

Packets are then transferred to the control plane. Control plane input queu=
es may map 1-1 with the data plane queues or map many to 1.
If the incoming packets are encapsulated (for example GRE) they may be tran=
sferred to a media specific control plane queue to process the encapsulatio=
n header. In some cases encapsulation may be processed in the data plane pr=
ior to transfer to the control plane.

Stage 4: Transfer to IS-IS

Packets are then transferred to a queue which is read directly by IS-IS. In=
 the event there are multiple IS-IS instances, implementations may choose t=
o have a shared queue which drives the execution of all instances or have i=
nstance specific queues filtered based on incoming interface.

A single queue is typically used for all interfaces and all IS-IS packet ty=
pes. Subsequent processing may requeue packets based on packet type e.g., s=
eparating processing of hellos from processing of LSPs/SNPs.

*********

A receiver based flow control mechanism which attempts to make dynamic adju=
stments needs to obtain real-time feedback from one or more of the above st=
ages. Monitoring the state of the input queue to IS-IS is easy to do, but w=
ould not account for drops at previous stages.
Obtaining feedback from earlier stages requires real-time updates from data=
 plane to IS-IS in the control plane. This is much more challenging. Idiosy=
ncrasies of platforms will have a significant impact on how to meaningfully=
 interpret and use the data. How to integrate data from the various stages =
- especially when the numbers are not specific to IS-IS packets - is not in=
tuitive.

https://tools.ietf.org/html/draft-decraene-lsr-isis-flooding-speed-03 provi=
des no guidance on how information from the dataplane could be used.
As an alternative, it suggests that static parameters derived from offline =
tests could be advertised. But static parameters would necessarily have to =
be conservative as they would need to account for the worst case scenarios.

draft-ginsberg-lsr-isis-flooding-scale proposes dynamic flow control based =
on the state of the transmitter. In this model, there is no dependency on p=
latform implementation. The number of unacknowledged LSPs sent on an interf=
ace is used as input to the flow control algorithm. This accounts for all r=
easons why a receiver may be slow to acknowledge without requiring knowledg=
e of which stage(s) described above are affecting the receiver's ability to=
 provide timely acknowledgements.

   Les


From: bruno.decraene@orange.com <bruno.decraene@orange.com>
Sent: Wednesday, February 26, 2020 11:03 AM
To: Les Ginsberg (ginsberg) <ginsberg@cisco.com>
Cc: lsr@ietf.org
Subject: RE: Flow Control Discussion for IS-IS Flooding Speed

Les,

Please see inline[Bruno]

From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg (ginsberg=
)
Sent: Wednesday, February 19, 2020 3:32 AM
To: lsr@ietf.org<mailto:lsr@ietf.org>
Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed

Base protocol operation of the Update process tracks the flooding of
LSPs/interface and guarantees timer-based retransmission on P2P interfaces
until an acknowledgment is received.

Using this base protocol mechanism in combination with exponential backoff =
of the
retransmission timer provides flow control in the event of temporary overlo=
ad
of the receiver.

This mechanism works without protocol extensions, is dynamic, operates
independent of the reason for delayed acknowledgment (dropped packets, CPU
overload), and does not require additional signaling during the overloaded
period.

This is consistent with the recommendations in RFC 4222 (OSPF).

Receiver-based flow control (as proposed in https://datatracker.ietf.org/do=
c/draft-decraene-lsr-isis-flooding-speed/ )
requires protocol extensions and introduces additional signaling during
periods of high load. The asserted reason for this is to optimize throughpu=
t -
but there is no evidence that it will achieve this goal.

Mention has been made to TCP-like flow control mechanisms as a model - whic=
h
are indeed receiver based. However, there are significant differences betwe=
en
TCP sessions and IGP flooding.

TCP consists of a single session between two endpoints. Resources
(primarily buffer space) for this session are typically allocated in the
control plane and current usage is easily measurable..

IGP flooding is point-to-multi-point, resources to support IGP flooding
involve both control plane queues and dataplane queues, both of which are
typically not per interface - nor even dedicated to a particular protocol
instance. What input is required to optimize receiver-based flow control is=
 not fully specified.

https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/ su=
ggests (Section 5) that the values
to be advertised:

"use a formula based on an off line tests of
   the overall LSPDU processing speed for a particular set of hardware
   and the number of interfaces configured for IS-IS"

implying that the advertised value is intentionally not dynamic. As such,
it could just as easily be configured on the transmit side and not require
additional signaling. As a static value, it would necessarily be somewhat
conservative as it has to account for the worst case under the current
configuration - which means it needs to consider concurrent use of the CPU
and dataplane by all protocols/features which are enabled on a router - not=
 all of whose
use is likely to be synchronized with peak IS-IS flooding load.
[Bruno] _Assuming_ that the parameters are static, those parameters

     *   are the same as the one implemented (configured) on multiple imple=
mentations, including the one from your employer. Now do you believe that t=
hose parameters can be determined?

        *   If yes, how do you do _today_ on your implementation? (this see=
ms to contradict your statement that you have no way to figure out how to f=
ind the right value)
        *   If no, why did you implement those parameters, and ask network =
operator to configure them?
        *   There is also the option to reply: I don't know but don't care =
as I leave the issue to the network operator.

     *   can still provide some form of dynamicity, by using the PSNP as dy=
namic acknowledgement.
     *   are really dependent on the receiver, not the sender.

        *   the sender will never overload itself.
        *   The receiver has more information,  knowing its processing powe=
r (low end, high end, 80s, 20s (currently we are stuck with 20 years old va=
lue assuming the worst possible receiver (and worst there were, including w=
ith packet processing partly done in the control plane processor)), its exp=
ected IS-IS load (#neighbors), its preference for bursty LSP reception (hig=
h delay between IS-IS CPU allocation cycles, memory not an issue up to x ki=
lo-octet...), its expected control plane load if IS-IS traffic has not high=
er priority over other control plane traffic...), it's expected level of Qo=
S prioritization [1]

           *   [1] looks for "Extended SPD Headroom". E.g. "Since IGP and l=
ink stability are more tenuous and more crucial than BGP stability, such pa=
ckets are now given the highest priority and are given extended SPD headroo=
m with a default of 10 packets. This means that these packets are not dropp=
ed if the size of the input hold queue is lower than 185 (input queue defau=
lt size + spd headroom size + spd extended headroom)."

              *   And this is for distributed architecture, 15 years ago. S=
o what about using the above number (in the router configuration), applies =
Tony's proposal (*oversubscription/number of IS neighbhors), and advertise =
this value to your LSP sender?



[1] https://www.cisco.com/c/en/us/support/docs/routers/12000-series-routers=
/29920-spd.html


  *
--Bruno


Unless a good case can be made as to why transmit-based flow control is not=
 a good
fit and why receiver-based flow control is demonstrably better, it seems
unnecessary to extend the protocol.

    Les


From: Lsr <lsr-bounces@ietf.org<mailto:lsr-bounces@ietf.org>> On Behalf Of =
Les Ginsberg (ginsberg)
Sent: Tuesday, February 18, 2020 6:25 PM
To: lsr@ietf.org<mailto:lsr@ietf.org>
Subject: [Lsr] Flow Control Discussion for IS-IS Flooding Speed

Two recent drafts advocate for the use of faster LSP flooding speeds in IS-=
IS:

https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/
https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/

There is strong agreement on two key points:

1)Modern networks require much faster flooding speeds than are commonly in =
use today

2)To deploy faster flooding speeds safely some form of flow control is need=
ed

The key point of contention between the two drafts is how flow control shou=
ld be implemented.

https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/ ad=
vocates for a receiver based flow control where the receiver advertises in =
hellos the parameters which indicate the rate/burst size which the receiver=
 is capable of supporting on the interface. Senders are required to limit t=
he rate of LSP transmission on that interface in accordance with the values=
 advertised by the receiver.

https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/  a=
dvocates for a transmit based flow control where the transmitter monitors t=
he number of unacknowledged LSPs sent on each interface and implements a ba=
ckoff algorithm to slow the rate of sending LSPs based on the length of the=
 per interface unacknowledged queue.

While other differences between the two drafts exist, it is fair to say tha=
t if agreement could be reached on the form of flow control  then it is lik=
ely other issues could be resolved easily.

This email starts the discussion regarding the flow control issue.




___________________________________________________________________________=
______________________________________________



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--_000_MW3PR11MB46198978E071B8C7E79770CEC1D90MW3PR11MB4619namp_
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<div class=3D"WordSection1">
<p class=3D"MsoNormal">Bruno &#8211;<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Returning to this old thread&#8230;<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The following is a generic description of how receiv=
e path for IS-IS PDUs functions today &#8211; based on examination of imple=
mentations on a variety of platforms from my employer. It is, for obvious r=
easons, &nbsp;generic and intentionally omits
 any discussion of implementation details. <o:p></o:p></p>
<p class=3D"MsoNormal">But it is hopefully detailed enough to illustrate so=
me of the challenges in regards to providing real-time&nbsp; accurate feedb=
ack to the control plane that could be used by a receiver based flow contro=
l mechanism.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Stage 1: Input Policing<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">As a first step, a policer operates at ingress to ra=
te limit the number of packets which will be punted for local processing. T=
his typically operates in an interface independent manner - limiting the to=
tal number of packets per second across
 all interfaces. <o:p></o:p></p>
<p class=3D"MsoNormal">The policer may rate limit different classes of pack=
ets or simply limit all types of packets. A given platform may apply a limi=
t specific to IS-IS PDUs or apply a limit to a class of packets (e.g., OSPF=
&#43;BGP&#43;IS-IS combined).<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Stage 2: Punt Queue Shaping<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Received packets are then placed in a queue for even=
tual transfer to the control plane. The number of queues varies. In some ca=
ses a single queue for all packet types is used. In other cases packets are=
 placed on different queues based
 on packet classes. <o:p></o:p></p>
<p class=3D"MsoNormal">Each queue is typically bounded to a maximum number =
of packets. As the queue usage approaches a limit, shaping policies are app=
lied to prioritize certain packet types over others.
<o:p></o:p></p>
<p class=3D"MsoNormal">An upper limit specific to IS-IS packets may be empl=
oyed - or a limit may be applied to a larger class of packet types of which=
 IS-IS is only one of the packet types in the class.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Stage 3: Transfer to control Plane<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Packets are then transferred to the control plane. C=
ontrol plane input queues may map 1-1 with the data plane queues or map man=
y to 1.
<o:p></o:p></p>
<p class=3D"MsoNormal">If the incoming packets are encapsulated (for exampl=
e GRE) they may be transferred to a media specific control plane queue to p=
rocess the encapsulation header. In some cases encapsulation may be process=
ed in the data plane prior to transfer
 to the control plane.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Stage 4: Transfer to IS-IS<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Packets are then transferred to a queue which is rea=
d directly by IS-IS. In the event there are multiple IS-IS instances, imple=
mentations may choose to have a shared queue which drives the execution of =
all instances or have instance specific
 queues filtered based on incoming interface.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">A single queue is typically used for all interfaces =
and all IS-IS packet types. Subsequent processing may requeue packets based=
 on packet type e.g., separating processing of hellos from processing of LS=
Ps/SNPs.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">*********<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">A receiver based flow control mechanism which attemp=
ts to make dynamic adjustments needs to obtain real-time feedback from one =
or more of the above stages. Monitoring the state of the input queue to IS-=
IS is easy to do, but would not account
 for drops at previous stages.<o:p></o:p></p>
<p class=3D"MsoNormal">Obtaining feedback from earlier stages requires real=
-time updates from data plane to IS-IS in the control plane. This is much m=
ore challenging. Idiosyncrasies of platforms will have a significant impact=
 on how to meaningfully interpret
 and use the data. How to integrate data from the various stages &#8211; es=
pecially when the numbers are not specific to IS-IS packets &#8211; is not =
intuitive.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><a href=3D"https://tools.ietf.org/html/draft-decraen=
e-lsr-isis-flooding-speed-03">https://tools.ietf.org/html/draft-decraene-ls=
r-isis-flooding-speed-03</a> provides no guidance on how information from t=
he dataplane could be used.
<o:p></o:p></p>
<p class=3D"MsoNormal">As an alternative, it suggests that static parameter=
s derived from offline tests could be advertised. But static parameters wou=
ld necessarily have to be conservative as they would need to account for th=
e worst case scenarios.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">draft-ginsberg-lsr-isis-flooding-scale proposes dyna=
mic flow control based on the state of the transmitter. In this model, ther=
e is no dependency on platform implementation. The number of unacknowledged=
 LSPs sent on an interface is used
 as input to the flow control algorithm. This accounts for all reasons why =
a receiver may be slow to acknowledge without requiring knowledge of which =
stage(s) described above are affecting the receiver&#8217;s ability to prov=
ide timely acknowledgements.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp;&nbsp; Les<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> bruno.decraene@orange.com &lt;bruno.dec=
raene@orange.com&gt;
<br>
<b>Sent:</b> Wednesday, February 26, 2020 11:03 AM<br>
<b>To:</b> Les Ginsberg (ginsberg) &lt;ginsberg@cisco.com&gt;<br>
<b>Cc:</b> lsr@ietf.org<br>
<b>Subject:</b> RE: Flow Control Discussion for IS-IS Flooding Speed<o:p></=
o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"FR" style=3D"color:#1F497D">Les,<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR" style=3D"color:#1F497D"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR" style=3D"color:#1F497D">Please see=
 inline[Bruno]<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR" style=3D"color:#1F497D"><o:p>&nbsp=
;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><b><span lang=3D"FR" st=
yle=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif">From:</s=
pan></b><span lang=3D"FR" style=3D"font-size:10.0pt;font-family:&quot;Tahom=
a&quot;,sans-serif"> Lsr [<a href=3D"mailto:lsr-bounces@ietf.org">mailto:ls=
r-bounces@ietf.org</a>]
<b>On Behalf Of </b>Les Ginsberg (ginsberg)<br>
<b>Sent:</b> Wednesday, February 19, 2020 3:32 AM<br>
<b>To:</b> <a href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a><br>
<b>Subject:</b> Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed<=
o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"FR"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">Base protocol operation=
 of the Update process tracks the flooding of<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">LSPs/interface and guar=
antees timer-based retransmission on P2P interfaces<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">until an acknowledgment=
 is received.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">Using this base protoco=
l mechanism in combination with exponential backoff of the<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">retransmission timer pr=
ovides flow control in the event of temporary overload<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">of the receiver. <o:p><=
/o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">This mechanism works wi=
thout protocol extensions, is dynamic, operates<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">independent of the reas=
on for delayed acknowledgment (dropped packets, CPU<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">overload), and does not=
 require additional signaling during the overloaded<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">period.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">This is consistent with=
 the recommendations in RFC 4222 (OSPF).<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">Receiver-based flow con=
trol (as proposed in
<a href=3D"https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-floodin=
g-speed/">
https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/</a=
> )<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">requires protocol exten=
sions and introduces additional signaling during<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">periods of high load. T=
he asserted reason for this is to optimize throughput -<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">but there is no evidenc=
e that it will achieve this goal.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">Mention has been made t=
o TCP-like flow control mechanisms as a model - which<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">are indeed receiver bas=
ed. However, there are significant differences between<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">TCP sessions and IGP fl=
ooding.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">TCP consists of a singl=
e session between two endpoints. Resources<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">(primarily buffer space=
) for this session are typically allocated in the<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">control plane and curre=
nt usage is easily measurable..<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">IGP flooding is point-t=
o-multi-point, resources to support IGP flooding<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">involve both control pl=
ane queues and dataplane queues, both of which are<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">typically not per inter=
face - nor even dedicated to a particular protocol<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">instance. What input is=
 required to optimize receiver-based flow control is not fully specified.<o=
:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><a href=3D"https://data=
tracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/">https://datat=
racker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/</a> suggests (S=
ection 5) that the values<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">to be advertised:<o:p><=
/o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">&quot;use a formula bas=
ed on an off line tests of<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">&nbsp;&nbsp; the overal=
l LSPDU processing speed for a particular set of hardware<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">&nbsp;&nbsp; and the nu=
mber of interfaces configured for IS-IS&quot;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">implying that the adver=
tised value is intentionally not dynamic. As such,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">it could just as easily=
 be configured on the transmit side and not require<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">additional signaling. A=
s a static value, it would necessarily be somewhat<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">conservative as it has =
to account for the worst case under the current<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">configuration - which m=
eans it needs to consider concurrent use of the CPU<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">and dataplane by all pr=
otocols/features which are enabled on a router - not all of whose<o:p></o:p=
></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">use is likely to be syn=
chronized with peak IS-IS flooding load.<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">[Bruno] _<i>Assuming</=
i>_ that the parameters are static, those parameters
<o:p></o:p></span></p>
<ul style=3D"margin-top:0in" type=3D"disc">
<ul style=3D"margin-top:0in" type=3D"circle">
<li class=3D"MsoListParagraph" style=3D"color:#1F497D;margin-left:0in;mso-l=
ist:l0 level2 lfo2">
are the same as the one implemented (configured) on multiple implementation=
s, including the one from your employer. Now do you believe that those para=
meters can be determined?<o:p></o:p></li></ul>
</ul>
<ul style=3D"margin-top:0in" type=3D"disc">
<ul style=3D"margin-top:0in" type=3D"circle">
<ul style=3D"margin-top:0in" type=3D"square">
<li class=3D"MsoListParagraph" style=3D"color:#1F497D;margin-left:0in;mso-l=
ist:l0 level3 lfo2">
If yes, how do you do _<i>today</i>_ on your implementation? (this seems to=
 contradict your statement that you have no way to figure out how to find t=
he right value)<o:p></o:p></li><li class=3D"MsoListParagraph" style=3D"colo=
r:#1F497D;margin-left:0in;mso-list:l0 level3 lfo2">
If no, why did you implement those parameters, and ask network operator to =
configure them?<o:p></o:p></li><li class=3D"MsoListParagraph" style=3D"colo=
r:#1F497D;margin-left:0in;mso-list:l0 level3 lfo2">
There is also the option to reply: I don&#8217;t know but don&#8217;t care =
as I leave the issue to the network operator.<o:p></o:p></li></ul>
</ul>
</ul>
<ul style=3D"margin-top:0in" type=3D"disc">
<ul style=3D"margin-top:0in" type=3D"circle">
<li class=3D"MsoListParagraph" style=3D"color:#1F497D;margin-left:0in;mso-l=
ist:l0 level2 lfo2">
can still provide some form of dynamicity, by using the PSNP as dynamic ack=
nowledgement.
<o:p></o:p></li><li class=3D"MsoListParagraph" style=3D"color:#1F497D;margi=
n-left:0in;mso-list:l0 level2 lfo2">
are really dependent on the receiver, not the sender.<o:p></o:p></li></ul>
</ul>
<ul style=3D"margin-top:0in" type=3D"disc">
<ul style=3D"margin-top:0in" type=3D"circle">
<ul style=3D"margin-top:0in" type=3D"square">
<li class=3D"MsoListParagraph" style=3D"color:#1F497D;margin-left:0in;mso-l=
ist:l0 level3 lfo2">
the sender will never overload itself. <o:p></o:p></li><li class=3D"MsoList=
Paragraph" style=3D"color:#1F497D;margin-left:0in;mso-list:l0 level3 lfo2">
The receiver has more information,&nbsp; knowing its processing power (low =
end, high end, 80s, 20s (currently we are stuck with 20 years old value ass=
uming the worst possible receiver (and worst there were, including with pac=
ket processing partly done in the control
 plane processor)), its expected IS-IS load (#neighbors), its preference fo=
r bursty LSP reception (high delay between IS-IS CPU allocation cycles, mem=
ory not an issue up to x kilo-octet&#8230;), its expected control plane loa=
d if IS-IS traffic has not higher priority
 over other control plane traffic&#8230;), it&#8217;s expected level of QoS=
 prioritization [1]<o:p></o:p></li></ul>
</ul>
</ul>
<ul style=3D"margin-top:0in" type=3D"disc">
<ul style=3D"margin-top:0in" type=3D"circle">
<ul style=3D"margin-top:0in" type=3D"square">
<ul style=3D"margin-top:0in" type=3D"disc">
<li class=3D"MsoListParagraph" style=3D"color:#1F497D;margin-left:0in;mso-l=
ist:l0 level4 lfo2">
[1] looks for &#8220;Extended SPD Headroom&#8221;. E.g. &#8220;<span style=
=3D"color:windowtext">Since IGP and link stability are more tenuous and mor=
e crucial than BGP stability, such packets are now given the highest priori=
ty and are given extended SPD headroom with a default
 of 10 packets. This means that these packets are not dropped if the size o=
f the input hold queue is lower than 185 (input queue default size &#43; sp=
d headroom size &#43; spd extended headroom).&#8221;</span><o:p></o:p></li>=
</ul>
</ul>
</ul>
</ul>
<ul style=3D"margin-top:0in" type=3D"disc">
<ul style=3D"margin-top:0in" type=3D"circle">
<ul style=3D"margin-top:0in" type=3D"square">
<ul style=3D"margin-top:0in" type=3D"disc">
<ul style=3D"margin-top:0in" type=3D"circle">
<li class=3D"MsoListParagraph" style=3D"color:#1F497D;margin-left:0in;mso-l=
ist:l0 level5 lfo2">
And this is for distributed architecture, 15 years ago. So what about using=
 the above number (in the router configuration), applies Tony&#8217;s propo=
sal (*oversubscription/number of IS neighbhors), and advertise this value t=
o your LSP sender?<o:p></o:p></li></ul>
</ul>
</ul>
</ul>
</ul>
<p class=3D"MsoListParagraph"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:=
p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:141.6pt"><span style=3D"=
color:#1F497D">[1]
<a href=3D"https://www.cisco.com/c/en/us/support/docs/routers/12000-series-=
routers/29920-spd.html">
https://www.cisco.com/c/en/us/support/docs/routers/12000-series-routers/299=
20-spd.html</a>
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<ul style=3D"margin-top:0in" type=3D"disc">
<li class=3D"MsoListParagraph" style=3D"color:#1F497D;margin-left:0in;mso-l=
ist:l0 level1 lfo2">
<o:p>&nbsp;</o:p></li></ul>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"color:#1=
F497D">--Bruno<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"color:#1=
F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"color:#1=
F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">Unless a good case can =
be made as to why transmit-based flow control is not a good<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">fit and why receiver-ba=
sed flow control is demonstrably better, it seems<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">unnecessary to extend t=
he protocol.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">&nbsp;&nbsp;&nbsp; Les<=
o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><b>From:</b> Lsr &lt;<a=
 href=3D"mailto:lsr-bounces@ietf.org">lsr-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Les Ginsberg (ginsberg)<br>
<b>Sent:</b> Tuesday, February 18, 2020 6:25 PM<br>
<b>To:</b> <a href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a><br>
<b>Subject:</b> [Lsr] Flow Control Discussion for IS-IS Flooding Speed<o:p>=
</o:p></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">Two recent drafts advoc=
ate for the use of faster LSP flooding speeds in IS-IS:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><a href=3D"https://data=
tracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/">https://datat=
racker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/</a><o:p></o:p><=
/p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><a href=3D"https://data=
tracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/">https://datat=
racker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/</a><o:p></o:p><=
/p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">There is strong agreeme=
nt on two key points:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">1)Modern networks requi=
re much faster flooding speeds than are commonly in use today<o:p></o:p></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">2)To deploy faster floo=
ding speeds safely some form of flow control is needed<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">The key point of conten=
tion between the two drafts is how flow control should be implemented.<o:p>=
</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><a href=3D"https://data=
tracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/">https://datat=
racker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/</a> advocates f=
or a receiver based flow control where
 the receiver advertises in hellos the parameters which indicate the rate/b=
urst size which the receiver is capable of supporting on the interface. Sen=
ders are required to limit the rate of LSP transmission on that interface i=
n accordance with the values advertised
 by the receiver.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><a href=3D"https://data=
tracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/">https://datat=
racker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/</a> &nbsp;advoc=
ates for a transmit based flow control where
 the transmitter monitors the number of unacknowledged LSPs sent on each in=
terface and implements a backoff algorithm to slow the rate of sending LSPs=
 based on the length of the per interface unacknowledged queue.<o:p></o:p><=
/p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">While other differences=
 between the two drafts exist, it is fair to say that if agreement could be=
 reached on the form of flow control&nbsp; then it is likely other issues c=
ould be resolved easily.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">This email starts the d=
iscussion regarding the flow control issue.
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p=
>
</div>
<pre><span lang=3D"FR">____________________________________________________=
_____________________________________________________________________<o:p><=
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Date: Fri, 17 Apr 2020 14:34:51 -0700
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: "=?utf-8?Q?lsr=40ietf.org?=" <lsr@ietf.org>, "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>
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Subject: Re: [Lsr] FW: New Version Notification for draft-ginsberg-lsr-isis-flooding-scale-02.txt
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Very well written draft, 02 has significantly improved readability and addressed some missing details.
Would support adoption.

Cheers,
Jeff
On Apr 17, 2020, 12:55 PM -0700, Les Ginsberg (ginsberg) <ginsberg=40cisco.com@dmarc.ietf.org>, wrote:
> Folks -
>
> A new version of this draft has been uploaded.
>
> Comments welcomed.
>
> Les
>
> -----Original Message-----
> From: internet-drafts@ietf.org <internet-drafts@ietf.org>
> Sent: Friday, April 17, 2020 12:49 PM
> To: Tony Przygienda <prz@juniper.net>; Acee Lindem (acee) <acee@cisco.com>; Peter Psenak (ppsenak) <ppsenak@cisco.com>; Les Ginsberg (ginsberg) <ginsberg@cisco.com>
> Subject: New Version Notification for draft-ginsberg-lsr-isis-flooding-scale-02.txt
>
>
> A new version of I-D, draft-ginsberg-lsr-isis-flooding-scale-02.txt
> has been successfully submitted by Les Ginsberg and posted to the
> IETF repository.
>
> Name: draft-ginsberg-lsr-isis-flooding-scale
> Revision: 02
> Title: IS-IS Flooding Scale Considerations
> Document date: 2020-04-17
> Group: Individual Submission
> Pages: 13
> URL: https://www.ietf.org/internet-drafts/draft-ginsberg-lsr-isis-flooding-scale-02.txt
> Status: https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/
> Htmlized: https://tools.ietf.org/html/draft-ginsberg-lsr-isis-flooding-scale-02
> Htmlized: https://datatracker.ietf.org/doc/html/draft-ginsberg-lsr-isis-flooding-scale
> Diff: https://www.ietf.org/rfcdiff?url2=draft-ginsberg-lsr-isis-flooding-scale-02
>
> Abstract:
> Link State PDU flooding rates in use are much slower than what modern
> networks can support. The use of IS-IS at larger scale requires
> faster flooding rates to achieve desired convergence goals. This
> document discusses issues associated with increasing flooding rates
> and some recommended practices which allow faster flooding rates to
> be used safely.
>
>
>
>
>
> Please note that it may take a couple of minutes from the time of submission
> until the htmlized version and diff are available at tools.ietf.org.
>
> The IETF Secretariat
>
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr

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<html xmlns=3D=22http://www.w3.org/1999/xhtml=22>
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<div name=3D=22messageBodySection=22>
<div dir=3D=22auto=22>Very well written draft, 02 has significantly impro=
ved readability and addressed some missing details.&=23160;
<div dir=3D=22auto=22>Would support adoption.</div>
</div>
</div>
<div name=3D=22messageSignatureSection=22><br />
<div class=3D=22match=46ont=22>Cheers,
<div>Jeff</div>
</div>
</div>
<div name=3D=22messageReplySection=22>On Apr 17, 2020, 12:55 PM -0700, Le=
s Ginsberg (ginsberg) &lt;ginsberg=3D40cisco.com=40dmarc.ietf.org&gt;, wr=
ote:<br />
<blockquote type=3D=22cite=22 class=3D=22spark=5Fquote=22 style=3D=22marg=
in: 5px 5px; padding-left: 10px; border-left: thin solid =231abc9c;=22>=46=
olks -<br />
<br />
A new version of this draft has been uploaded.<br />
<br />
Comments welcomed.<br />
<br />
Les<br />
<br />
-----Original Message-----<br />
=46rom: internet-drafts=40ietf.org &lt;internet-drafts=40ietf.org&gt;<br =
/>
Sent: =46riday, April 17, 2020 12:49 PM<br />
To: Tony Przygienda &lt;prz=40juniper.net&gt;; Acee Lindem (acee) &lt;ace=
e=40cisco.com&gt;; Peter Psenak (ppsenak) &lt;ppsenak=40cisco.com&gt;; Le=
s Ginsberg (ginsberg) &lt;ginsberg=40cisco.com&gt;<br />
Subject: New Version Notification for draft-ginsberg-lsr-isis-flooding-sc=
ale-02.txt<br />
<br />
<br />
A new version of I-D, draft-ginsberg-lsr-isis-flooding-scale-02.txt<br />=

has been successfully submitted by Les Ginsberg and posted to the<br />
IET=46 repository.<br />
<br />
Name: draft-ginsberg-lsr-isis-flooding-scale<br />
Revision: 02<br />
Title: IS-IS =46looding Scale Considerations<br />
Document date: 2020-04-17<br />
Group: Individual Submission<br />
Pages: 13<br />
URL: https://www.ietf.org/internet-drafts/draft-ginsberg-lsr-isis-floodin=
g-scale-02.txt<br />
Status: https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding=
-scale/<br />
Htmlized: https://tools.ietf.org/html/draft-ginsberg-lsr-isis-flooding-sc=
ale-02<br />
Htmlized: https://datatracker.ietf.org/doc/html/draft-ginsberg-lsr-isis-f=
looding-scale<br />
Diff: https://www.ietf.org/rfcdiff=3Furl2=3Ddraft-ginsberg-lsr-isis-flood=
ing-scale-02<br />
<br />
Abstract:<br />
Link State PDU flooding rates in use are much slower than what modern<br =
/>
networks can support. The use of IS-IS at larger scale requires<br />
faster flooding rates to achieve desired convergence goals. This<br />
document discusses issues associated with increasing flooding rates<br />=

and some recommended practices which allow faster flooding rates to<br />=

be used safely.<br />
<br />
<br />
<br />
<br />
<br />
Please note that it may take a couple of minutes from the time of submiss=
ion<br />
until the htmlized version and diff are available at tools.ietf.org.<br /=
>
<br />
The IET=46 Secretariat<br />
<br />
<br />
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F<br />
Lsr mailing list<br />
Lsr=40ietf.org<br />
https://www.ietf.org/mailman/listinfo/lsr<br /></blockquote>
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From: Tony Przygienda <tonysietf@gmail.com>
Date: Sat, 18 Apr 2020 10:27:47 -0700
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Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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roughly same experience over couple commercial, heavy-lifting vendors on my
side. modulo that implementation in user space internally sometimes manages
queues per interface & different queues in/out per ISIS packet types +
plays with size of socket buffers across interfaces (don't forget, that's
not infinite resource either). As Les said, each stage can loose
independently and there are no feedbacks in any implementaiton/platform I
know of between the different buffering stages (albeit they could be built
on some platforms but that would make the protocol code mostly
nightmarishly platform dependent). Observe that each stage has different
timing characterics in terms of processing & that e.g. line card load & CPU
load can change the characterics very drastically (that has direct
implications on what the max. capacity to "soak packets in" is and with
that what the "acceptable flooding rate" is). It's not unheard of on low
end, highly loaded platforms to introduce 10s of millisecs delay between
packet hitting the link and being read out the socket. On high end or very
simple boxes you may be in tens of microsecs, that's a cool 3-4 orders of
magnitude. With the advent of VMs and containers things got _much_ worse,
both in variation and range. I  personally spent a day puzzling over an
impossible failing test case in a virtual env until I measured the delay
between one node sending a packet and reading it out on the other side in
my protocol implementation in this setup. It was _5_ seconds ....



-- tony

On Fri, Apr 17, 2020 at 1:42 PM Les Ginsberg (ginsberg) <ginsberg=3D
40cisco.com@dmarc.ietf.org> wrote:

> Bruno =E2=80=93
>
>
>
> Returning to this old thread=E2=80=A6
>
>
>
> The following is a generic description of how receive path for IS-IS PDUs
> functions today =E2=80=93 based on examination of implementations on a va=
riety of
> platforms from my employer. It is, for obvious reasons,  generic and
> intentionally omits any discussion of implementation details.
>
> But it is hopefully detailed enough to illustrate some of the challenges
> in regards to providing real-time  accurate feedback to the control plane
> that could be used by a receiver based flow control mechanism.
>
>
>
> Stage 1: Input Policing
>
>
>
> As a first step, a policer operates at ingress to rate limit the number o=
f
> packets which will be punted for local processing. This typically operate=
s
> in an interface independent manner - limiting the total number of packets
> per second across all interfaces.
>
> The policer may rate limit different classes of packets or simply limit
> all types of packets. A given platform may apply a limit specific to IS-I=
S
> PDUs or apply a limit to a class of packets (e.g., OSPF+BGP+IS-IS combine=
d).
>
>
>
> Stage 2: Punt Queue Shaping
>
>
>
> Received packets are then placed in a queue for eventual transfer to the
> control plane. The number of queues varies. In some cases a single queue
> for all packet types is used. In other cases packets are placed on
> different queues based on packet classes.
>
> Each queue is typically bounded to a maximum number of packets. As the
> queue usage approaches a limit, shaping policies are applied to prioritiz=
e
> certain packet types over others.
>
> An upper limit specific to IS-IS packets may be employed - or a limit may
> be applied to a larger class of packet types of which IS-IS is only one o=
f
> the packet types in the class.
>
>
>
> Stage 3: Transfer to control Plane
>
>
>
> Packets are then transferred to the control plane. Control plane input
> queues may map 1-1 with the data plane queues or map many to 1.
>
> If the incoming packets are encapsulated (for example GRE) they may be
> transferred to a media specific control plane queue to process the
> encapsulation header. In some cases encapsulation may be processed in the
> data plane prior to transfer to the control plane.
>
>
>
> Stage 4: Transfer to IS-IS
>
>
>
> Packets are then transferred to a queue which is read directly by IS-IS.
> In the event there are multiple IS-IS instances, implementations may choo=
se
> to have a shared queue which drives the execution of all instances or hav=
e
> instance specific queues filtered based on incoming interface.
>
>
>
> A single queue is typically used for all interfaces and all IS-IS packet
> types. Subsequent processing may requeue packets based on packet type e.g=
.,
> separating processing of hellos from processing of LSPs/SNPs.
>
>
>
> *********
>
>
>
> A receiver based flow control mechanism which attempts to make dynamic
> adjustments needs to obtain real-time feedback from one or more of the
> above stages. Monitoring the state of the input queue to IS-IS is easy to
> do, but would not account for drops at previous stages.
>
> Obtaining feedback from earlier stages requires real-time updates from
> data plane to IS-IS in the control plane. This is much more challenging.
> Idiosyncrasies of platforms will have a significant impact on how to
> meaningfully interpret and use the data. How to integrate data from the
> various stages =E2=80=93 especially when the numbers are not specific to =
IS-IS
> packets =E2=80=93 is not intuitive.
>
>
>
> https://tools.ietf.org/html/draft-decraene-lsr-isis-flooding-speed-03
> provides no guidance on how information from the dataplane could be used.
>
> As an alternative, it suggests that static parameters derived from offlin=
e
> tests could be advertised. But static parameters would necessarily have t=
o
> be conservative as they would need to account for the worst case scenario=
s.
>
>
>
> draft-ginsberg-lsr-isis-flooding-scale proposes dynamic flow control base=
d
> on the state of the transmitter. In this model, there is no dependency on
> platform implementation. The number of unacknowledged LSPs sent on an
> interface is used as input to the flow control algorithm. This accounts f=
or
> all reasons why a receiver may be slow to acknowledge without requiring
> knowledge of which stage(s) described above are affecting the receiver=E2=
=80=99s
> ability to provide timely acknowledgements.
>
>
>
>    Les
>
>
>
>
>
> *From:* bruno.decraene@orange.com <bruno.decraene@orange.com>
> *Sent:* Wednesday, February 26, 2020 11:03 AM
> *To:* Les Ginsberg (ginsberg) <ginsberg@cisco.com>
> *Cc:* lsr@ietf.org
> *Subject:* RE: Flow Control Discussion for IS-IS Flooding Speed
>
>
>
> Les,
>
>
>
> Please see inline[Bruno]
>
>
>
> *From:* Lsr [mailto:lsr-bounces@ietf.org <lsr-bounces@ietf.org>] *On
> Behalf Of *Les Ginsberg (ginsberg)
> *Sent:* Wednesday, February 19, 2020 3:32 AM
> *To:* lsr@ietf.org
> *Subject:* Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
>
>
>
> Base protocol operation of the Update process tracks the flooding of
>
> LSPs/interface and guarantees timer-based retransmission on P2P interface=
s
>
> until an acknowledgment is received.
>
>
>
> Using this base protocol mechanism in combination with exponential backof=
f
> of the
>
> retransmission timer provides flow control in the event of temporary
> overload
>
> of the receiver.
>
>
>
> This mechanism works without protocol extensions, is dynamic, operates
>
> independent of the reason for delayed acknowledgment (dropped packets, CP=
U
>
> overload), and does not require additional signaling during the overloade=
d
>
> period.
>
>
>
> This is consistent with the recommendations in RFC 4222 (OSPF).
>
>
>
> Receiver-based flow control (as proposed in
> https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/ =
)
>
> requires protocol extensions and introduces additional signaling during
>
> periods of high load. The asserted reason for this is to optimize
> throughput -
>
> but there is no evidence that it will achieve this goal.
>
>
>
> Mention has been made to TCP-like flow control mechanisms as a model -
> which
>
> are indeed receiver based. However, there are significant differences
> between
>
> TCP sessions and IGP flooding.
>
>
>
> TCP consists of a single session between two endpoints. Resources
>
> (primarily buffer space) for this session are typically allocated in the
>
> control plane and current usage is easily measurable..
>
>
>
> IGP flooding is point-to-multi-point, resources to support IGP flooding
>
> involve both control plane queues and dataplane queues, both of which are
>
> typically not per interface - nor even dedicated to a particular protocol
>
> instance. What input is required to optimize receiver-based flow control
> is not fully specified.
>
>
>
> https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/
> suggests (Section 5) that the values
>
> to be advertised:
>
>
>
> "use a formula based on an off line tests of
>
>    the overall LSPDU processing speed for a particular set of hardware
>
>    and the number of interfaces configured for IS-IS"
>
>
>
> implying that the advertised value is intentionally not dynamic. As such,
>
> it could just as easily be configured on the transmit side and not requir=
e
>
> additional signaling. As a static value, it would necessarily be somewhat
>
> conservative as it has to account for the worst case under the current
>
> configuration - which means it needs to consider concurrent use of the CP=
U
>
> and dataplane by all protocols/features which are enabled on a router -
> not all of whose
>
> use is likely to be synchronized with peak IS-IS flooding load.
>
> [Bruno] _*Assuming*_ that the parameters are static, those parameters
>
>    - are the same as the one implemented (configured) on multiple
>       implementations, including the one from your employer. Now do you b=
elieve
>       that those parameters can be determined?
>
>
>    - If yes, how do you do _*today*_ on your implementation? (this seems
>          to contradict your statement that you have no way to figure out =
how to find
>          the right value)
>          - If no, why did you implement those parameters, and ask network
>          operator to configure them?
>          - There is also the option to reply: I don=E2=80=99t know but do=
n=E2=80=99t care
>          as I leave the issue to the network operator.
>
>
>    - can still provide some form of dynamicity, by using the PSNP as
>       dynamic acknowledgement.
>       - are really dependent on the receiver, not the sender.
>
>
>    - the sender will never overload itself.
>          - The receiver has more information,  knowing its processing
>          power (low end, high end, 80s, 20s (currently we are stuck with =
20 years
>          old value assuming the worst possible receiver (and worst there =
were,
>          including with packet processing partly done in the control plan=
e
>          processor)), its expected IS-IS load (#neighbors), its preferenc=
e for
>          bursty LSP reception (high delay between IS-IS CPU allocation cy=
cles,
>          memory not an issue up to x kilo-octet=E2=80=A6), its expected c=
ontrol plane load
>          if IS-IS traffic has not higher priority over other control plan=
e
>          traffic=E2=80=A6), it=E2=80=99s expected level of QoS prioritiza=
tion [1]
>
>
>    - [1] looks for =E2=80=9CExtended SPD Headroom=E2=80=9D. E.g. =E2=80=
=9CSince IGP and link
>             stability are more tenuous and more crucial than BGP stabilit=
y, such
>             packets are now given the highest priority and are given exte=
nded SPD
>             headroom with a default of 10 packets. This means that these =
packets are
>             not dropped if the size of the input hold queue is lower than=
 185 (input
>             queue default size + spd headroom size + spd extended headroo=
m).=E2=80=9D
>
>
>    - And this is for distributed architecture, 15 years ago. So what
>                about using the above number (in the router configuration)=
, applies Tony=E2=80=99s
>                proposal (*oversubscription/number of IS neighbhors), and =
advertise this
>                value to your LSP sender?
>
>
>
> [1]
> https://www.cisco.com/c/en/us/support/docs/routers/12000-series-routers/2=
9920-spd.html
>
>
>
>    -
>
> --Bruno
>
>
>
>
>
> Unless a good case can be made as to why transmit-based flow control is
> not a good
>
> fit and why receiver-based flow control is demonstrably better, it seems
>
> unnecessary to extend the protocol.
>
>
>
>     Les
>
>
>
>
>
> *From:* Lsr <lsr-bounces@ietf.org> *On Behalf Of *Les Ginsberg (ginsberg)
> *Sent:* Tuesday, February 18, 2020 6:25 PM
> *To:* lsr@ietf.org
> *Subject:* [Lsr] Flow Control Discussion for IS-IS Flooding Speed
>
>
>
> Two recent drafts advocate for the use of faster LSP flooding speeds in
> IS-IS:
>
>
>
> https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/
>
> https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/
>
>
>
> There is strong agreement on two key points:
>
>
>
> 1)Modern networks require much faster flooding speeds than are commonly i=
n
> use today
>
>
>
> 2)To deploy faster flooding speeds safely some form of flow control is
> needed
>
>
>
> The key point of contention between the two drafts is how flow control
> should be implemented.
>
>
>
> https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/
> advocates for a receiver based flow control where the receiver advertises
> in hellos the parameters which indicate the rate/burst size which the
> receiver is capable of supporting on the interface. Senders are required =
to
> limit the rate of LSP transmission on that interface in accordance with t=
he
> values advertised by the receiver.
>
>
>
> https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/
>  advocates for a transmit based flow control where the transmitter monito=
rs
> the number of unacknowledged LSPs sent on each interface and implements a
> backoff algorithm to slow the rate of sending LSPs based on the length of
> the per interface unacknowledged queue.
>
>
>
> While other differences between the two drafts exist, it is fair to say
> that if agreement could be reached on the form of flow control  then it i=
s
> likely other issues could be resolved easily.
>
>
>
> This email starts the discussion regarding the flow control issue.
>
>
>
>
>
> _________________________________________________________________________=
________________________________________________
>
>
>
> Ce message et ses pieces jointes peuvent contenir des informations confid=
entielles ou privilegiees et ne doivent donc
>
> pas etre diffuses, exploites ou copies sans autorisation. Si vous avez re=
cu ce message par erreur, veuillez le signaler
>
> a l'expediteur et le detruire ainsi que les pieces jointes. Les messages =
electroniques etant susceptibles d'alteration,
>
> Orange decline toute responsabilite si ce message a ete altere, deforme o=
u falsifie. Merci.
>
>
>
> This message and its attachments may contain confidential or privileged i=
nformation that may be protected by law;
>
> they should not be distributed, used or copied without authorisation.
>
> If you have received this email in error, please notify the sender and de=
lete this message and its attachments.
>
> As emails may be altered, Orange is not liable for messages that have bee=
n modified, changed or falsified.
>
> Thank you.
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>

--00000000000077ccab05a393ff86
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>
<p class=3D"MsoNormal">roughly same experience over couple commercial, heav=
y-lifting=20
vendors on my side. modulo that implementation in user space internally=20
sometimes manages queues per interface &amp; different queues in/out per
 ISIS packet types + plays with size of socket
 buffers across interfaces (don&#39;t forget, that&#39;s not infinite resou=
rce=20
either). As Les said, each stage can loose independently and there are=20
no feedbacks in any implementaiton/platform I know of between the=20
different buffering stages (albeit they could be
 built on some platforms but that would make the protocol code mostly=20
nightmarishly platform dependent). Observe that each stage has different
 timing characterics in terms of processing &amp; that e.g. line card=20
load &amp; CPU load can change the characterics very
 drastically (that has direct implications on what the max. capacity to=20
&quot;soak packets in&quot; is and with that what the &quot;acceptable floo=
ding rate&quot;=20
is). It&#39;s not unheard of on low end, highly loaded platforms to=20
introduce 10s of millisecs delay between packet hitting
 the link and being read out the socket. On high end or very simple=20
boxes you may be in tens of microsecs, that&#39;s a cool 3-4 orders of=20
magnitude. With the advent of VMs and containers things got _much_=20
worse, both in variation and range. I=C2=A0 personally spent
 a day puzzling over an impossible failing test case in a virtual env=20
until I measured the delay between one node sending a packet and reading
 it out on the other side in my protocol implementation in this setup.=20
It was _5_ seconds ....
</p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0</p>
</div>
<div>
<p class=3D"MsoNormal">-- tony </p></div></div><br><div class=3D"gmail_quot=
e"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, Apr 17, 2020 at 1:42 PM Le=
s Ginsberg (ginsberg) &lt;ginsberg=3D<a href=3D"mailto:40cisco.com@dmarc.ie=
tf.org">40cisco.com@dmarc.ietf.org</a>&gt; wrote:<br></div><blockquote clas=
s=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid r=
gb(204,204,204);padding-left:1ex">





<div lang=3D"EN-US">
<div>
<p class=3D"MsoNormal">Bruno =E2=80=93<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Returning to this old thread=E2=80=A6<u></u><u></u><=
/p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">The following is a generic description of how receiv=
e path for IS-IS PDUs functions today =E2=80=93 based on examination of imp=
lementations on a variety of platforms from my employer. It is, for obvious=
 reasons, =C2=A0generic and intentionally omits
 any discussion of implementation details. <u></u><u></u></p>
<p class=3D"MsoNormal">But it is hopefully detailed enough to illustrate so=
me of the challenges in regards to providing real-time=C2=A0 accurate feedb=
ack to the control plane that could be used by a receiver based flow contro=
l mechanism.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Stage 1: Input Policing<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">As a first step, a policer operates at ingress to ra=
te limit the number of packets which will be punted for local processing. T=
his typically operates in an interface independent manner - limiting the to=
tal number of packets per second across
 all interfaces. <u></u><u></u></p>
<p class=3D"MsoNormal">The policer may rate limit different classes of pack=
ets or simply limit all types of packets. A given platform may apply a limi=
t specific to IS-IS PDUs or apply a limit to a class of packets (e.g., OSPF=
+BGP+IS-IS combined).<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Stage 2: Punt Queue Shaping<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Received packets are then placed in a queue for even=
tual transfer to the control plane. The number of queues varies. In some ca=
ses a single queue for all packet types is used. In other cases packets are=
 placed on different queues based
 on packet classes. <u></u><u></u></p>
<p class=3D"MsoNormal">Each queue is typically bounded to a maximum number =
of packets. As the queue usage approaches a limit, shaping policies are app=
lied to prioritize certain packet types over others.
<u></u><u></u></p>
<p class=3D"MsoNormal">An upper limit specific to IS-IS packets may be empl=
oyed - or a limit may be applied to a larger class of packet types of which=
 IS-IS is only one of the packet types in the class.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Stage 3: Transfer to control Plane<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Packets are then transferred to the control plane. C=
ontrol plane input queues may map 1-1 with the data plane queues or map man=
y to 1.
<u></u><u></u></p>
<p class=3D"MsoNormal">If the incoming packets are encapsulated (for exampl=
e GRE) they may be transferred to a media specific control plane queue to p=
rocess the encapsulation header. In some cases encapsulation may be process=
ed in the data plane prior to transfer
 to the control plane.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Stage 4: Transfer to IS-IS<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Packets are then transferred to a queue which is rea=
d directly by IS-IS. In the event there are multiple IS-IS instances, imple=
mentations may choose to have a shared queue which drives the execution of =
all instances or have instance specific
 queues filtered based on incoming interface.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">A single queue is typically used for all interfaces =
and all IS-IS packet types. Subsequent processing may requeue packets based=
 on packet type e.g., separating processing of hellos from processing of LS=
Ps/SNPs.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">*********<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">A receiver based flow control mechanism which attemp=
ts to make dynamic adjustments needs to obtain real-time feedback from one =
or more of the above stages. Monitoring the state of the input queue to IS-=
IS is easy to do, but would not account
 for drops at previous stages.<u></u><u></u></p>
<p class=3D"MsoNormal">Obtaining feedback from earlier stages requires real=
-time updates from data plane to IS-IS in the control plane. This is much m=
ore challenging. Idiosyncrasies of platforms will have a significant impact=
 on how to meaningfully interpret
 and use the data. How to integrate data from the various stages =E2=80=93 =
especially when the numbers are not specific to IS-IS packets =E2=80=93 is =
not intuitive.
<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><a href=3D"https://tools.ietf.org/html/draft-decraen=
e-lsr-isis-flooding-speed-03" target=3D"_blank">https://tools.ietf.org/html=
/draft-decraene-lsr-isis-flooding-speed-03</a> provides no guidance on how =
information from the dataplane could be used.
<u></u><u></u></p>
<p class=3D"MsoNormal">As an alternative, it suggests that static parameter=
s derived from offline tests could be advertised. But static parameters wou=
ld necessarily have to be conservative as they would need to account for th=
e worst case scenarios.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">draft-ginsberg-lsr-isis-flooding-scale proposes dyna=
mic flow control based on the state of the transmitter. In this model, ther=
e is no dependency on platform implementation. The number of unacknowledged=
 LSPs sent on an interface is used
 as input to the flow control algorithm. This accounts for all reasons why =
a receiver may be slow to acknowledge without requiring knowledge of which =
stage(s) described above are affecting the receiver=E2=80=99s ability to pr=
ovide timely acknowledgements.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">=C2=A0=C2=A0 Les<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div style=3D"border-color:currentcolor currentcolor currentcolor blue;bord=
er-style:none none none solid;border-width:medium medium medium 1.5pt;paddi=
ng:0in 0in 0in 4pt">
<div>
<div style=3D"border-color:rgb(225,225,225) currentcolor currentcolor;borde=
r-style:solid none none;border-width:1pt medium medium;padding:3pt 0in 0in"=
>
<p class=3D"MsoNormal"><b>From:</b> <a href=3D"mailto:bruno.decraene@orange=
.com" target=3D"_blank">bruno.decraene@orange.com</a> &lt;<a href=3D"mailto=
:bruno.decraene@orange.com" target=3D"_blank">bruno.decraene@orange.com</a>=
&gt;
<br>
<b>Sent:</b> Wednesday, February 26, 2020 11:03 AM<br>
<b>To:</b> Les Ginsberg (ginsberg) &lt;<a href=3D"mailto:ginsberg@cisco.com=
" target=3D"_blank">ginsberg@cisco.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</=
a><br>
<b>Subject:</b> RE: Flow Control Discussion for IS-IS Flooding Speed<u></u>=
<u></u></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125)" lang=3D"FR">Les=
,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125)" lang=3D"FR"><u>=
</u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125)" lang=3D"FR">Ple=
ase see inline[Bruno]<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125)" lang=3D"FR"><u>=
</u>=C2=A0<u></u></span></p>
<div>
<div style=3D"border-color:rgb(181,196,223) currentcolor currentcolor;borde=
r-style:solid none none;border-width:1pt medium medium;padding:3pt 0in 0in"=
>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><b><span style=3D"font-=
size:10pt;font-family:&quot;Tahoma&quot;,sans-serif" lang=3D"FR">From:</spa=
n></b><span style=3D"font-size:10pt;font-family:&quot;Tahoma&quot;,sans-ser=
if" lang=3D"FR"> Lsr [<a href=3D"mailto:lsr-bounces@ietf.org" target=3D"_bl=
ank">mailto:lsr-bounces@ietf.org</a>]
<b>On Behalf Of </b>Les Ginsberg (ginsberg)<br>
<b>Sent:</b> Wednesday, February 19, 2020 3:32 AM<br>
<b>To:</b> <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</=
a><br>
<b>Subject:</b> Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed<=
u></u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"FR"><u></=
u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">Base protocol operation=
 of the Update process tracks the flooding of<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">LSPs/interface and guar=
antees timer-based retransmission on P2P interfaces<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">until an acknowledgment=
 is received.<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">Using this base protoco=
l mechanism in combination with exponential backoff of the<u></u><u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">retransmission timer pr=
ovides flow control in the event of temporary overload<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">of the receiver. <u></u=
><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">=C2=A0<u></u><u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">This mechanism works wi=
thout protocol extensions, is dynamic, operates<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">independent of the reas=
on for delayed acknowledgment (dropped packets, CPU<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">overload), and does not=
 require additional signaling during the overloaded<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">period.<u></u><u></u></=
p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">This is consistent with=
 the recommendations in RFC 4222 (OSPF).<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">Receiver-based flow con=
trol (as proposed in
<a href=3D"https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-floodin=
g-speed/" target=3D"_blank">
https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/</a=
> )<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">requires protocol exten=
sions and introduces additional signaling during<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">periods of high load. T=
he asserted reason for this is to optimize throughput -<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">but there is no evidenc=
e that it will achieve this goal.<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">Mention has been made t=
o TCP-like flow control mechanisms as a model - which<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">are indeed receiver bas=
ed. However, there are significant differences between<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">TCP sessions and IGP fl=
ooding.<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">TCP consists of a singl=
e session between two endpoints. Resources<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">(primarily buffer space=
) for this session are typically allocated in the<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">control plane and curre=
nt usage is easily measurable..<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">IGP flooding is point-t=
o-multi-point, resources to support IGP flooding<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">involve both control pl=
ane queues and dataplane queues, both of which are<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">typically not per inter=
face - nor even dedicated to a particular protocol<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">instance. What input is=
 required to optimize receiver-based flow control is not fully specified.<u=
></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><a href=3D"https://data=
tracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/" target=3D"_bl=
ank">https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-spee=
d/</a> suggests (Section 5) that the values<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">to be advertised:<u></u=
><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">&quot;use a formula bas=
ed on an off line tests of<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">=C2=A0=C2=A0 the overal=
l LSPDU processing speed for a particular set of hardware<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">=C2=A0=C2=A0 and the nu=
mber of interfaces configured for IS-IS&quot;<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">implying that the adver=
tised value is intentionally not dynamic. As such,<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">it could just as easily=
 be configured on the transmit side and not require<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">additional signaling. A=
s a static value, it would necessarily be somewhat<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">conservative as it has =
to account for the worst case under the current<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">configuration - which m=
eans it needs to consider concurrent use of the CPU<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">and dataplane by all pr=
otocols/features which are enabled on a router - not all of whose<u></u><u>=
</u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">use is likely to be syn=
chronized with peak IS-IS flooding load.<u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125)">[Bruno] _<i>Ass=
uming</i>_ that the parameters are static, those parameters
<u></u><u></u></span></p>
<ul style=3D"margin-top:0in" type=3D"disc">
<ul style=3D"margin-top:0in" type=3D"circle">
<li style=3D"color:rgb(31,73,125);margin-left:0in">
are the same as the one implemented (configured) on multiple implementation=
s, including the one from your employer. Now do you believe that those para=
meters can be determined?<u></u><u></u></li></ul>
</ul>
<ul style=3D"margin-top:0in" type=3D"disc">
<ul style=3D"margin-top:0in" type=3D"circle">
<ul style=3D"margin-top:0in" type=3D"square">
<li style=3D"color:rgb(31,73,125);margin-left:0in">
If yes, how do you do _<i>today</i>_ on your implementation? (this seems to=
 contradict your statement that you have no way to figure out how to find t=
he right value)<u></u><u></u></li><li style=3D"color:rgb(31,73,125);margin-=
left:0in">
If no, why did you implement those parameters, and ask network operator to =
configure them?<u></u><u></u></li><li style=3D"color:rgb(31,73,125);margin-=
left:0in">
There is also the option to reply: I don=E2=80=99t know but don=E2=80=99t c=
are as I leave the issue to the network operator.<u></u><u></u></li></ul>
</ul>
</ul>
<ul style=3D"margin-top:0in" type=3D"disc">
<ul style=3D"margin-top:0in" type=3D"circle">
<li style=3D"color:rgb(31,73,125);margin-left:0in">
can still provide some form of dynamicity, by using the PSNP as dynamic ack=
nowledgement.
<u></u><u></u></li><li style=3D"color:rgb(31,73,125);margin-left:0in">
are really dependent on the receiver, not the sender.<u></u><u></u></li></u=
l>
</ul>
<ul style=3D"margin-top:0in" type=3D"disc">
<ul style=3D"margin-top:0in" type=3D"circle">
<ul style=3D"margin-top:0in" type=3D"square">
<li style=3D"color:rgb(31,73,125);margin-left:0in">
the sender will never overload itself. <u></u><u></u></li><li style=3D"colo=
r:rgb(31,73,125);margin-left:0in">
The receiver has more information,=C2=A0 knowing its processing power (low =
end, high end, 80s, 20s (currently we are stuck with 20 years old value ass=
uming the worst possible receiver (and worst there were, including with pac=
ket processing partly done in the control
 plane processor)), its expected IS-IS load (#neighbors), its preference fo=
r bursty LSP reception (high delay between IS-IS CPU allocation cycles, mem=
ory not an issue up to x kilo-octet=E2=80=A6), its expected control plane l=
oad if IS-IS traffic has not higher priority
 over other control plane traffic=E2=80=A6), it=E2=80=99s expected level of=
 QoS prioritization [1]<u></u><u></u></li></ul>
</ul>
</ul>
<ul style=3D"margin-top:0in" type=3D"disc">
<ul style=3D"margin-top:0in" type=3D"circle">
<ul style=3D"margin-top:0in" type=3D"square">
<ul style=3D"margin-top:0in" type=3D"disc">
<li style=3D"color:rgb(31,73,125);margin-left:0in">
[1] looks for =E2=80=9CExtended SPD Headroom=E2=80=9D. E.g. =E2=80=9C<span =
style=3D"color:windowtext">Since IGP and link stability are more tenuous an=
d more crucial than BGP stability, such packets are now given the highest p=
riority and are given extended SPD headroom with a default
 of 10 packets. This means that these packets are not dropped if the size o=
f the input hold queue is lower than 185 (input queue default size + spd he=
adroom size + spd extended headroom).=E2=80=9D</span><u></u><u></u></li></u=
l>
</ul>
</ul>
</ul>
<ul style=3D"margin-top:0in" type=3D"disc">
<ul style=3D"margin-top:0in" type=3D"circle">
<ul style=3D"margin-top:0in" type=3D"square">
<ul style=3D"margin-top:0in" type=3D"disc">
<ul style=3D"margin-top:0in" type=3D"circle">
<li style=3D"color:rgb(31,73,125);margin-left:0in">
And this is for distributed architecture, 15 years ago. So what about using=
 the above number (in the router configuration), applies Tony=E2=80=99s pro=
posal (*oversubscription/number of IS neighbhors), and advertise this value=
 to your LSP sender?<u></u><u></u></li></ul>
</ul>
</ul>
</ul>
</ul>
<p><span style=3D"color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p>
<p style=3D"margin-left:141.6pt"><span style=3D"color:rgb(31,73,125)">[1]
<a href=3D"https://www.cisco.com/c/en/us/support/docs/routers/12000-series-=
routers/29920-spd.html" target=3D"_blank">
https://www.cisco.com/c/en/us/support/docs/routers/12000-series-routers/299=
20-spd.html</a>
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125)"><u></u>=C2=A0<u=
></u></span></p>
<ul style=3D"margin-top:0in" type=3D"disc">
<li style=3D"color:rgb(31,73,125);margin-left:0in">
<u></u>=C2=A0<u></u></li></ul>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"color:rg=
b(31,73,125)">--Bruno<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"color:rg=
b(31,73,125)"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"color:rg=
b(31,73,125)"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">Unless a good case can =
be made as to why transmit-based flow control is not a good<u></u><u></u></=
p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">fit and why receiver-ba=
sed flow control is demonstrably better, it seems<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">unnecessary to extend t=
he protocol.<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">=C2=A0=C2=A0=C2=A0 Les<=
u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
<div style=3D"border-color:currentcolor currentcolor currentcolor blue;bord=
er-style:none none none solid;border-width:medium medium medium 1.5pt;paddi=
ng:0in 0in 0in 4pt">
<div>
<div style=3D"border-color:rgb(225,225,225) currentcolor currentcolor;borde=
r-style:solid none none;border-width:1pt medium medium;padding:3pt 0in 0in"=
>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><b>From:</b> Lsr &lt;<a=
 href=3D"mailto:lsr-bounces@ietf.org" target=3D"_blank">lsr-bounces@ietf.or=
g</a>&gt;
<b>On Behalf Of </b>Les Ginsberg (ginsberg)<br>
<b>Sent:</b> Tuesday, February 18, 2020 6:25 PM<br>
<b>To:</b> <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</=
a><br>
<b>Subject:</b> [Lsr] Flow Control Discussion for IS-IS Flooding Speed<u></=
u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">Two recent drafts advoc=
ate for the use of faster LSP flooding speeds in IS-IS:<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><a href=3D"https://data=
tracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/" target=3D"_bl=
ank">https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-spee=
d/</a><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><a href=3D"https://data=
tracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/" target=3D"_bl=
ank">https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scal=
e/</a><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">There is strong agreeme=
nt on two key points:<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">1)Modern networks requi=
re much faster flooding speeds than are commonly in use today<u></u><u></u>=
</p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">2)To deploy faster floo=
ding speeds safely some form of flow control is needed<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">The key point of conten=
tion between the two drafts is how flow control should be implemented.<u></=
u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><a href=3D"https://data=
tracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/" target=3D"_bl=
ank">https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-spee=
d/</a> advocates for a receiver based flow control where
 the receiver advertises in hellos the parameters which indicate the rate/b=
urst size which the receiver is capable of supporting on the interface. Sen=
ders are required to limit the rate of LSP transmission on that interface i=
n accordance with the values advertised
 by the receiver.<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><a href=3D"https://data=
tracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/" target=3D"_bl=
ank">https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scal=
e/</a> =C2=A0advocates for a transmit based flow control where
 the transmitter monitors the number of unacknowledged LSPs sent on each in=
terface and implements a backoff algorithm to slow the rate of sending LSPs=
 based on the length of the per interface unacknowledged queue.<u></u><u></=
u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">While other differences=
 between the two drafts exist, it is fair to say that if agreement could be=
 reached on the form of flow control=C2=A0 then it is likely other issues c=
ould be resolved easily.<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">This email starts the d=
iscussion regarding the flow control issue.
<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
<p style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p>
</div>
<pre><span lang=3D"FR">____________________________________________________=
_____________________________________________________________________<u></u=
><u></u></span></pre>
<pre><span lang=3D"FR"><u></u>=C2=A0<u></u></span></pre>
<pre><span lang=3D"FR">Ce message et ses pieces jointes peuvent contenir de=
s informations confidentielles ou privilegiees et ne doivent donc<u></u><u>=
</u></span></pre>
<pre><span lang=3D"FR">pas etre diffuses, exploites ou copies sans autorisa=
tion. Si vous avez recu ce message par erreur, veuillez le signaler<u></u><=
u></u></span></pre>
<pre><span lang=3D"FR">a l&#39;expediteur et le detruire ainsi que les piec=
es jointes. Les messages electroniques etant susceptibles d&#39;alteration,=
<u></u><u></u></span></pre>
<pre><span lang=3D"FR">Orange decline toute responsabilite si ce message a =
ete altere, deforme ou falsifie. Merci.<u></u><u></u></span></pre>
<pre><span lang=3D"FR"><u></u>=C2=A0<u></u></span></pre>
<pre><span lang=3D"FR">This message and its attachments may contain confide=
ntial or privileged information that may be protected by law;<u></u><u></u>=
</span></pre>
<pre><span lang=3D"FR">they should not be distributed, used or copied witho=
ut authorisation.<u></u><u></u></span></pre>
<pre><span lang=3D"FR">If you have received this email in error, please not=
ify the sender and delete this message and its attachments.<u></u><u></u></=
span></pre>
<pre><span lang=3D"FR">As emails may be altered, Orange is not liable for m=
essages that have been modified, changed or falsified.<u></u><u></u></span>=
</pre>
<pre><span lang=3D"FR">Thank you.<u></u><u></u></span></pre>
</div>
</div>
</div>

_______________________________________________<br>
Lsr mailing list<br>
<a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferrer" ta=
rget=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br>
</blockquote></div>

--00000000000077ccab05a393ff86--


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From: <bruno.decraene@orange.com>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
CC: "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: Flow Control Discussion for IS-IS Flooding Speed
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Date: Mon, 20 Apr 2020 11:47:00 +0000
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Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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Les,

After nearly 2 months, can we expect an answer from your side?

More specifically, the below question

[Bruno] _Assuming_ that the parameters are static, the parameters proposed =
in draft-decraene-lsr-isis-flooding-speed are the same as the one implement=
ed (configured) on multiple implementations, including the one from your em=
ployer.
Now do you believe that those parameters can be determined?

=A7  If yes, how do you do _today_ on your implementation? (this seems to c=
ontradict your statement that you have no way to figure out how to find the=
 right value)

=A7  If no, why did you implement those parameters, and ask network operato=
r to configure them?


Thank you,
--Bruno

From: DECRAENE Bruno TGI/OLN
Sent: Wednesday, February 26, 2020 8:03 PM
To: 'Les Ginsberg (ginsberg)'
Cc: lsr@ietf.org
Subject: RE: Flow Control Discussion for IS-IS Flooding Speed

Les,

Please see inline[Bruno]

From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg (ginsberg)
Sent: Wednesday, February 19, 2020 3:32 AM
To: lsr@ietf.org
Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed

Base protocol operation of the Update process tracks the flooding of
LSPs/interface and guarantees timer-based retransmission on P2P interfaces
until an acknowledgment is received.

Using this base protocol mechanism in combination with exponential backoff =
of the
retransmission timer provides flow control in the event of temporary overlo=
ad
of the receiver.

This mechanism works without protocol extensions, is dynamic, operates
independent of the reason for delayed acknowledgment (dropped packets, CPU
overload), and does not require additional signaling during the overloaded
period.

This is consistent with the recommendations in RFC 4222 (OSPF).

Receiver-based flow control (as proposed in https://datatracker.ietf.org/do=
c/draft-decraene-lsr-isis-flooding-speed/ )
requires protocol extensions and introduces additional signaling during
periods of high load. The asserted reason for this is to optimize throughpu=
t -
but there is no evidence that it will achieve this goal.

Mention has been made to TCP-like flow control mechanisms as a model - which
are indeed receiver based. However, there are significant differences betwe=
en
TCP sessions and IGP flooding.

TCP consists of a single session between two endpoints. Resources
(primarily buffer space) for this session are typically allocated in the
control plane and current usage is easily measurable..

IGP flooding is point-to-multi-point, resources to support IGP flooding
involve both control plane queues and dataplane queues, both of which are
typically not per interface - nor even dedicated to a particular protocol
instance. What input is required to optimize receiver-based flow control is=
 not fully specified.

https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/ su=
ggests (Section 5) that the values
to be advertised:

"use a formula based on an off line tests of
   the overall LSPDU processing speed for a particular set of hardware
   and the number of interfaces configured for IS-IS"

implying that the advertised value is intentionally not dynamic. As such,
it could just as easily be configured on the transmit side and not require
additional signaling. As a static value, it would necessarily be somewhat
conservative as it has to account for the worst case under the current
configuration - which means it needs to consider concurrent use of the CPU
and dataplane by all protocols/features which are enabled on a router - not=
 all of whose
use is likely to be synchronized with peak IS-IS flooding load.
[Bruno] _Assuming_ that the parameters are static, those parameters

o   are the same as the one implemented (configured) on multiple implementa=
tions, including the one from your employer. Now do you believe that those =
parameters can be determined?

=A7  If yes, how do you do _today_ on your implementation? (this seems to c=
ontradict your statement that you have no way to figure out how to find the=
 right value)

=A7  If no, why did you implement those parameters, and ask network operato=
r to configure them?

=A7  There is also the option to reply: I don't know but don't care as I le=
ave the issue to the network operator.

o   can still provide some form of dynamicity, by using the PSNP as dynamic=
 acknowledgement.

o   are really dependent on the receiver, not the sender.

=A7  the sender will never overload itself.

=A7  The receiver has more information,  knowing its processing power (low =
end, high end, 80s, 20s (currently we are stuck with 20 years old value ass=
uming the worst possible receiver (and worst there were, including with pac=
ket processing partly done in the control plane processor)), its expected I=
S-IS load (#neighbors), its preference for bursty LSP reception (high delay=
 between IS-IS CPU allocation cycles, memory not an issue up to x kilo-octe=
t...), its expected control plane load if IS-IS traffic has not higher prio=
rity over other control plane traffic...), it's expected level of QoS prior=
itization [1]

=B7          [1] looks for "Extended SPD Headroom". E.g. "Since IGP and lin=
k stability are more tenuous and more crucial than BGP stability, such pack=
ets are now given the highest priority and are given extended SPD headroom =
with a default of 10 packets. This means that these packets are not dropped=
 if the size of the input hold queue is lower than 185 (input queue default=
 size + spd headroom size + spd extended headroom)."

o   And this is for distributed architecture, 15 years ago. So what about u=
sing the above number (in the router configuration), applies Tony's proposa=
l (*oversubscription/number of IS neighbhors), and advertise this value to =
your LSP sender?



[1] https://www.cisco.com/c/en/us/support/docs/routers/12000-series-routers=
/29920-spd.html


-
--Bruno


Unless a good case can be made as to why transmit-based flow control is not=
 a good
fit and why receiver-based flow control is demonstrably better, it seems
unnecessary to extend the protocol.

    Les


From: Lsr <lsr-bounces@ietf.org> On Behalf Of Les Ginsberg (ginsberg)
Sent: Tuesday, February 18, 2020 6:25 PM
To: lsr@ietf.org
Subject: [Lsr] Flow Control Discussion for IS-IS Flooding Speed

Two recent drafts advocate for the use of faster LSP flooding speeds in IS-=
IS:

https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/
https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/

There is strong agreement on two key points:

1)Modern networks require much faster flooding speeds than are commonly in =
use today

2)To deploy faster flooding speeds safely some form of flow control is need=
ed

The key point of contention between the two drafts is how flow control shou=
ld be implemented.

https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/ ad=
vocates for a receiver based flow control where the receiver advertises in =
hellos the parameters which indicate the rate/burst size which the receiver=
 is capable of supporting on the interface. Senders are required to limit t=
he rate of LSP transmission on that interface in accordance with the values=
 advertised by the receiver.

https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/  a=
dvocates for a transmit based flow control where the transmitter monitors t=
he number of unacknowledged LSPs sent on each interface and implements a ba=
ckoff algorithm to slow the rate of sending LSPs based on the length of the=
 per interface unacknowledged queue.

While other differences between the two drafts exist, it is fair to say tha=
t if agreement could be reached on the form of flow control  then it is lik=
ely other issues could be resolved easily.

This email starts the discussion regarding the flow control issue.




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</head>
<body lang=3D"FR" link=3D"blue" vlink=3D"purple" style=3D"tab-interval:35.4=
pt">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-US">Les,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-US">After nearly 2 months, can we expect an
 answer from your side?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-US">More specifically, the below question<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229=
.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2p=
t 687.0pt 732.8pt">
<span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Courier Ne=
w&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;mso-ansi-langua=
ge:EN-US">[Bruno] _Assuming_ that the parameters are static, the parameters=
 proposed in draft-<span class=3D"SpellE">decraene</span>-<span class=3D"Sp=
ellE">lsr</span>-<span class=3D"SpellE">isis</span>-flooding-speed
 are the same as the one implemented (configured) on multiple implementatio=
ns, including the one from your employer.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229=
.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2p=
t 687.0pt 732.8pt">
<span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Courier Ne=
w&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;mso-ansi-langua=
ge:EN-US">Now do you believe that those parameters can be determined?<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal" style=3D"tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229=
.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2p=
t 687.0pt 732.8pt">
<span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Courier Ne=
w&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;mso-ansi-langua=
ge:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229=
.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2p=
t 687.0pt 732.8pt">
<span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Courier Ne=
w&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;mso-ansi-langua=
ge:EN-US">=A7<span style=3D"mso-spacerun:yes">&nbsp;
</span>If yes, how do you do _today_ on your implementation? (this seems to=
 contradict your statement that you have no way to figure out how to find t=
he right value)<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229=
.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2p=
t 687.0pt 732.8pt">
<span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Courier Ne=
w&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;mso-ansi-langua=
ge:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 229=
.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2p=
t 687.0pt 732.8pt">
<span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Courier Ne=
w&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;mso-ansi-langua=
ge:EN-US">=A7<span style=3D"mso-spacerun:yes">&nbsp;
</span>If no, why did you implement those parameters, and ask network opera=
tor to configure them?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-US">Thank you,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-US">--Bruno<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibri;mso-b=
idi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language=
:EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span class=3D"SpellE">=
<b><span style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;san=
s-serif&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;">From</sp=
an></b></span><b><span style=3D"font-size:10.0pt;font-family:&quot;Tahoma&q=
uot;,&quot;sans-serif&quot;;mso-fareast-font-family:&quot;Times New Roman&q=
uot;">:</span></b><span style=3D"font-size:10.0pt;font-family:&quot;Tahoma&=
quot;,&quot;sans-serif&quot;;mso-fareast-font-family:&quot;Times New Roman&=
quot;">
 DECRAENE Bruno TGI/OLN <br>
<b>Sent:</b> Wednesday, February 26, 2020 8:03 PM<br>
<b>To:</b> 'Les Ginsberg (ginsberg)'<br>
<b>Cc:</b> lsr@ietf.org<br>
<b>Subject:</b> RE: Flow Control Discussion for IS-IS Flooding Speed<o:p></=
o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"mso-bidi=
-font-family:&quot;Times New Roman&quot;;color:#1F497D">Les,<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"mso-bidi=
-font-family:&quot;Times New Roman&quot;;color:#1F497D"><o:p>&nbsp;</o:p></=
span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"mso-bidi=
-font-family:&quot;Times New Roman&quot;;color:#1F497D">Please see inline[B=
runo]<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"mso-bidi=
-font-family:&quot;Times New Roman&quot;;color:#1F497D"><o:p>&nbsp;</o:p></=
span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><b><span style=3D"font-=
size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;mso-farea=
st-font-family:&quot;Times New Roman&quot;">From:</span></b><span style=3D"=
font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;mso-=
fareast-font-family:&quot;Times New Roman&quot;">
 Lsr [mailto:lsr-bounces@ietf.org] <b>On Behalf Of </b>Les Ginsberg (ginsbe=
rg)<br>
<b>Sent:</b> Wednesday, February 19, 2020 3:32 AM<br>
<b>To:</b> lsr@ietf.org<br>
<b>Subject:</b> Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed<=
o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">Base protocol operation of the Update proce=
ss tracks the flooding of<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">LSPs/interface and guarantees timer-based r=
etransmission on P2P interfaces<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">until an acknowledgment is received.<o:p></=
o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">Using this base protocol mechanism in combi=
nation with exponential backoff of the<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">retransmission timer provides flow control =
in the event of temporary overload<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">of the receiver.
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">This mechanism works without protocol exten=
sions, is dynamic, operates<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">independent of the reason for delayed ackno=
wledgment (dropped packets, CPU<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">overload), and does not require additional =
signaling during the overloaded<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">period.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">This is consistent with the recommendations=
 in RFC 4222 (OSPF).<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">Receiver-based flow control (as proposed in
<a href=3D"https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-floodin=
g-speed/">
https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/</a=
> )<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">requires protocol extensions and introduces=
 additional signaling during<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">periods of high load. The asserted reason f=
or this is to optimize throughput -<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">but there is no evidence that it will achie=
ve this goal.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">Mention has been made to TCP-like flow cont=
rol mechanisms as a model - which<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">are indeed receiver based. However, there a=
re significant differences between<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">TCP sessions and IGP flooding.<o:p></o:p></=
span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">TCP consists of a single session between tw=
o endpoints. Resources<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">(primarily buffer space) for this session a=
re typically allocated in the<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">control plane and current usage is easily m=
easurable..<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">IGP flooding is point-to-multi-point, resou=
rces to support IGP flooding<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">involve both control plane queues and datap=
lane queues, both of which are<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">typically not per interface - nor even dedi=
cated to a particular protocol<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">instance. What input is required to optimiz=
e receiver-based flow control is not fully specified.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><a href=3D"https://datatracker.ietf.org/doc=
/draft-decraene-lsr-isis-flooding-speed/">https://datatracker.ietf.org/doc/=
draft-decraene-lsr-isis-flooding-speed/</a>
 suggests (Section 5) that the values<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">to be advertised:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">&quot;use a formula based on an off line te=
sts of<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">&nbsp;&nbsp; the overall LSPDU processing s=
peed for a particular set of hardware<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">&nbsp;&nbsp; and the number of interfaces c=
onfigured for IS-IS&quot;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">implying that the advertised value is inten=
tionally not dynamic. As such,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">it could just as easily be configured on th=
e transmit side and not require<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">additional signaling. As a static value, it=
 would necessarily be somewhat<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">conservative as it has to account for the w=
orst case under the current<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">configuration - which means it needs to con=
sider concurrent use of the CPU<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">and dataplane by all protocols/features whi=
ch are enabled on a router - not all of whose<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">use is likely to be synchronized with peak =
IS-IS flooding load.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-bidi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-a=
nsi-language:EN-US">[Bruno] _<i>Assuming</i>_ that the parameters are stati=
c, those parameters
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:107.4pt;text-indent:-18.=
0pt;mso-list:l0 level2 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:&quot;Courie=
r New&quot;;mso-fareast-font-family:&quot;Courier New&quot;;color:#1F497D;m=
so-ansi-language:EN-US"><span style=3D"mso-list:Ignore">o<span style=3D"fon=
t:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"mso-bidi-font-=
family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">a=
re the same as the one implemented (configured) on multiple implementations=
, including the one from your employer. Now do
 you believe that those parameters can be determined?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:143.4pt;text-indent:-18.=
0pt;mso-list:l0 level3 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Wingdings;ms=
o-fareast-font-family:Wingdings;mso-bidi-font-family:Wingdings;color:#1F497=
D;mso-ansi-language:EN-US"><span style=3D"mso-list:Ignore">=A7<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"mso-bidi-font-=
family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">I=
f yes, how do you do _<i>today</i>_ on your implementation? (this seems to =
contradict your statement that you have no way
 to figure out how to find the right value)<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:143.4pt;text-indent:-18.=
0pt;mso-list:l0 level3 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Wingdings;ms=
o-fareast-font-family:Wingdings;mso-bidi-font-family:Wingdings;color:#1F497=
D;mso-ansi-language:EN-US"><span style=3D"mso-list:Ignore">=A7<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"mso-bidi-font-=
family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">I=
f no, why did you implement those parameters, and ask network operator to c=
onfigure them?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:143.4pt;text-indent:-18.=
0pt;mso-list:l0 level3 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Wingdings;ms=
o-fareast-font-family:Wingdings;mso-bidi-font-family:Wingdings;color:#1F497=
D;mso-ansi-language:EN-US"><span style=3D"mso-list:Ignore">=A7<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"mso-bidi-font-=
family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">T=
here is also the option to reply: I don&#8217;t know but don&#8217;t care a=
s I leave the issue to the network operator.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:107.4pt;text-indent:-18.=
0pt;mso-list:l0 level2 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:&quot;Courie=
r New&quot;;mso-fareast-font-family:&quot;Courier New&quot;;color:#1F497D;m=
so-ansi-language:EN-US"><span style=3D"mso-list:Ignore">o<span style=3D"fon=
t:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"mso-bidi-font-=
family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">c=
an still provide some form of dynamicity, by using the PSNP as dynamic ackn=
owledgement.
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:107.4pt;text-indent:-18.=
0pt;mso-list:l0 level2 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:&quot;Courie=
r New&quot;;mso-fareast-font-family:&quot;Courier New&quot;;color:#1F497D;m=
so-ansi-language:EN-US"><span style=3D"mso-list:Ignore">o<span style=3D"fon=
t:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"mso-bidi-font-=
family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">a=
re really dependent on the receiver, not the sender.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:143.4pt;text-indent:-18.=
0pt;mso-list:l0 level3 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Wingdings;ms=
o-fareast-font-family:Wingdings;mso-bidi-font-family:Wingdings;color:#1F497=
D;mso-ansi-language:EN-US"><span style=3D"mso-list:Ignore">=A7<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"mso-bidi-font-=
family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">t=
he sender will never overload itself.
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:143.4pt;text-indent:-18.=
0pt;mso-list:l0 level3 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Wingdings;ms=
o-fareast-font-family:Wingdings;mso-bidi-font-family:Wingdings;color:#1F497=
D;mso-ansi-language:EN-US"><span style=3D"mso-list:Ignore">=A7<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"mso-bidi-font-=
family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">T=
he receiver has more information,<span style=3D"mso-spacerun:yes">&nbsp;
</span>knowing its processing power (low end, high end, 80s, 20s (currently=
 we are stuck with 20 years old value assuming the worst possible receiver =
(and worst there were, including with packet processing partly done in the =
control plane processor)), its expected
 IS-IS load (#neighbors), its preference for bursty LSP reception (high del=
ay between IS-IS CPU allocation cycles, memory not an issue up to x kilo-oc=
tet&#8230;), its expected control plane load if IS-IS traffic has not highe=
r priority over other control plane traffic&#8230;),
 it&#8217;s expected level of QoS prioritization [1]<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:179.4pt;text-indent:-18.=
0pt;mso-list:l0 level4 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:Symbol;mso-f=
areast-font-family:Symbol;mso-bidi-font-family:Symbol;color:#1F497D;mso-ans=
i-language:EN-US"><span style=3D"mso-list:Ignore">=B7<span style=3D"font:7.=
0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"mso-bidi-font-=
family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US"><=
span style=3D"mso-spacerun:yes">&nbsp;</span>[1] looks for &#8220;Extended =
SPD Headroom&#8221;. E.g. &#8220;</span><span lang=3D"EN-US" style=3D"mso-a=
nsi-language:EN-US">Since
 IGP and link stability are more tenuous and more crucial than BGP stabilit=
y, such packets are now given the highest priority and are given extended S=
PD headroom with a default of 10 packets. This means that these packets are=
 not dropped if the size of the
 input hold queue is lower than 185 (input queue default size &#43; spd hea=
droom size &#43; spd extended headroom).&#8221;</span><span lang=3D"EN-US" =
style=3D"mso-bidi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso=
-ansi-language:EN-US"><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:215.4pt;text-indent:-18.=
0pt;mso-list:l0 level5 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:&quot;Courie=
r New&quot;;mso-fareast-font-family:&quot;Courier New&quot;;color:#1F497D;m=
so-ansi-language:EN-US"><span style=3D"mso-list:Ignore">o<span style=3D"fon=
t:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"mso-bidi-font-=
family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">A=
nd this is for distributed architecture, 15 years ago. So what about using =
the above number (in the router configuration),
 applies Tony&#8217;s proposal (*oversubscription/number of IS neighbhors),=
 and advertise this value to your LSP sender?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:71.4pt"><span lang=3D"EN=
-US" style=3D"mso-bidi-font-family:&quot;Times New Roman&quot;;color:#1F497=
D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:177.0pt"><span lang=3D"E=
N-US" style=3D"mso-bidi-font-family:&quot;Times New Roman&quot;;color:#1F49=
7D;mso-ansi-language:EN-US">[1]
<a href=3D"https://www.cisco.com/c/en/us/support/docs/routers/12000-series-=
routers/29920-spd.html">
https://www.cisco.com/c/en/us/support/docs/routers/12000-series-routers/299=
20-spd.html</a>
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-bidi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-a=
nsi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:71.4pt;text-indent:-18.0=
pt;mso-list:l0 level1 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;mso-ansi-l=
anguage:EN-US"><span style=3D"mso-list:Ignore">-<span style=3D"font:7.0pt &=
quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"mso-bidi-font-=
family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US"><=
o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"color:#1F497D;mso-ansi-language:EN-US">--Bruno<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">Unless a good case can be made as to why tr=
ansmit-based flow control is not a good<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">fit and why receiver-based flow control is =
demonstrably better, it seems<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">unnecessary to extend the protocol.<o:p></o=
:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">&nbsp;&nbsp;&nbsp; Les<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><b><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">From:</span></b><span lang=3D"EN-US" sty=
le=3D"mso-ansi-language:EN-US"> Lsr &lt;lsr-bounces@ietf.org&gt;
<b>On Behalf Of </b>Les Ginsberg (ginsberg)<br>
<b>Sent:</b> Tuesday, February 18, 2020 6:25 PM<br>
<b>To:</b> lsr@ietf.org<br>
<b>Subject:</b> [Lsr] Flow Control Discussion for IS-IS Flooding Speed<o:p>=
</o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">Two recent drafts advocate for the use of f=
aster LSP flooding speeds in IS-IS:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><a href=3D"https://datatracker.ietf.org/doc=
/draft-decraene-lsr-isis-flooding-speed/">https://datatracker.ietf.org/doc/=
draft-decraene-lsr-isis-flooding-speed/</a><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><a href=3D"https://datatracker.ietf.org/doc=
/draft-ginsberg-lsr-isis-flooding-scale/">https://datatracker.ietf.org/doc/=
draft-ginsberg-lsr-isis-flooding-scale/</a><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">There is strong agreement on two key points=
:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">1)Modern networks require much faster flood=
ing speeds than are commonly in use today<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">2)To deploy faster flooding speeds safely s=
ome form of flow control is needed<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">The key point of contention between the two=
 drafts is how flow control should be implemented.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><a href=3D"https://datatracker.ietf.org/doc=
/draft-decraene-lsr-isis-flooding-speed/">https://datatracker.ietf.org/doc/=
draft-decraene-lsr-isis-flooding-speed/</a>
 advocates for a receiver based flow control where the receiver advertises =
in hellos the parameters which indicate the rate/burst size which the recei=
ver is capable of supporting on the interface. Senders are required to limi=
t the rate of LSP transmission on
 that interface in accordance with the values advertised by the receiver.<o=
:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><a href=3D"https://datatracker.ietf.org/doc=
/draft-ginsberg-lsr-isis-flooding-scale/">https://datatracker.ietf.org/doc/=
draft-ginsberg-lsr-isis-flooding-scale/</a>
 &nbsp;advocates for a transmit based flow control where the transmitter mo=
nitors the number of unacknowledged LSPs sent on each interface and impleme=
nts a backoff algorithm to slow the rate of sending LSPs based on the lengt=
h of the per interface unacknowledged
 queue.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">While other differences between the two dra=
fts exist, it is fair to say that if agreement could be reached on the form=
 of flow control&nbsp; then it is likely other
 issues could be resolved easily.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">This email starts the discussion regarding =
the flow control issue.
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:70.8pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
</div>
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From: <bruno.decraene@orange.com>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
CC: "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: Flow Control Discussion for IS-IS Flooding Speed
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Date: Mon, 20 Apr 2020 12:20:40 +0000
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Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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Les,

Thank you for this first answer. This is inline with my understanding of th=
e behavior.
I wish some of the behaviors and values (e.g. queue size, rate limiting) co=
uld be shared. At minimum a range of typical values for platform which are =
not end of sale. I don't think this is secret. Actually, this is something =
that network provider would need in order to configure the right value for =
the parameters which are implemented on the platforms of your employer, so =
this should be on the public documentation of your employer. One could also=
 think that you may be proud of your implementations and eager to show that=
 it performs well.

Waiting some more details, as per you below email, the IS-IS receiver does =
have a queue, sometimes dedicated to IS-IS, but in general relatively dedic=
ated to very important and time sensitive traffic to the control plane. Det=
ails are indeed implementation specific. But in general, this queue is desi=
gned to protect the IS-IS traffic from lower priority traffic, e.g. bursty =
BGP. So can we assume that the receiver have (or at least may have) such a =
queue, and work with this?

--Bruno

From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]
Sent: Friday, April 17, 2020 10:41 PM
To: DECRAENE Bruno TGI/OLN
Cc: lsr@ietf.org
Subject: RE: Flow Control Discussion for IS-IS Flooding Speed

Bruno -

Returning to this old thread...

The following is a generic description of how receive path for IS-IS PDUs f=
unctions today - based on examination of implementations on a variety of pl=
atforms from my employer. It is, for obvious reasons,  generic and intentio=
nally omits any discussion of implementation details.
But it is hopefully detailed enough to illustrate some of the challenges in=
 regards to providing real-time  accurate feedback to the control plane tha=
t could be used by a receiver based flow control mechanism.

Stage 1: Input Policing

As a first step, a policer operates at ingress to rate limit the number of =
packets which will be punted for local processing. This typically operates =
in an interface independent manner - limiting the total number of packets p=
er second across all interfaces.
The policer may rate limit different classes of packets or simply limit all=
 types of packets. A given platform may apply a limit specific to IS-IS PDU=
s or apply a limit to a class of packets (e.g., OSPF+BGP+IS-IS combined).

Stage 2: Punt Queue Shaping

Received packets are then placed in a queue for eventual transfer to the co=
ntrol plane. The number of queues varies. In some cases a single queue for =
all packet types is used. In other cases packets are placed on different qu=
eues based on packet classes.
Each queue is typically bounded to a maximum number of packets. As the queu=
e usage approaches a limit, shaping policies are applied to prioritize cert=
ain packet types over others.
An upper limit specific to IS-IS packets may be employed - or a limit may b=
e applied to a larger class of packet types of which IS-IS is only one of t=
he packet types in the class.

Stage 3: Transfer to control Plane

Packets are then transferred to the control plane. Control plane input queu=
es may map 1-1 with the data plane queues or map many to 1.
If the incoming packets are encapsulated (for example GRE) they may be tran=
sferred to a media specific control plane queue to process the encapsulatio=
n header. In some cases encapsulation may be processed in the data plane pr=
ior to transfer to the control plane.

Stage 4: Transfer to IS-IS

Packets are then transferred to a queue which is read directly by IS-IS. In=
 the event there are multiple IS-IS instances, implementations may choose t=
o have a shared queue which drives the execution of all instances or have i=
nstance specific queues filtered based on incoming interface.

A single queue is typically used for all interfaces and all IS-IS packet ty=
pes. Subsequent processing may requeue packets based on packet type e.g., s=
eparating processing of hellos from processing of LSPs/SNPs.

*********

A receiver based flow control mechanism which attempts to make dynamic adju=
stments needs to obtain real-time feedback from one or more of the above st=
ages. Monitoring the state of the input queue to IS-IS is easy to do, but w=
ould not account for drops at previous stages.
Obtaining feedback from earlier stages requires real-time updates from data=
 plane to IS-IS in the control plane. This is much more challenging. Idiosy=
ncrasies of platforms will have a significant impact on how to meaningfully=
 interpret and use the data. How to integrate data from the various stages =
- especially when the numbers are not specific to IS-IS packets - is not in=
tuitive.

https://tools.ietf.org/html/draft-decraene-lsr-isis-flooding-speed-03 provi=
des no guidance on how information from the dataplane could be used.
As an alternative, it suggests that static parameters derived from offline =
tests could be advertised. But static parameters would necessarily have to =
be conservative as they would need to account for the worst case scenarios.

draft-ginsberg-lsr-isis-flooding-scale proposes dynamic flow control based =
on the state of the transmitter. In this model, there is no dependency on p=
latform implementation. The number of unacknowledged LSPs sent on an interf=
ace is used as input to the flow control algorithm. This accounts for all r=
easons why a receiver may be slow to acknowledge without requiring knowledg=
e of which stage(s) described above are affecting the receiver's ability to=
 provide timely acknowledgements.

   Les


From: bruno.decraene@orange.com <bruno.decraene@orange.com>
Sent: Wednesday, February 26, 2020 11:03 AM
To: Les Ginsberg (ginsberg) <ginsberg@cisco.com>
Cc: lsr@ietf.org
Subject: RE: Flow Control Discussion for IS-IS Flooding Speed

Les,

Please see inline[Bruno]

From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg (ginsberg)
Sent: Wednesday, February 19, 2020 3:32 AM
To: lsr@ietf.org<mailto:lsr@ietf.org>
Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed

Base protocol operation of the Update process tracks the flooding of
LSPs/interface and guarantees timer-based retransmission on P2P interfaces
until an acknowledgment is received.

Using this base protocol mechanism in combination with exponential backoff =
of the
retransmission timer provides flow control in the event of temporary overlo=
ad
of the receiver.

This mechanism works without protocol extensions, is dynamic, operates
independent of the reason for delayed acknowledgment (dropped packets, CPU
overload), and does not require additional signaling during the overloaded
period.

This is consistent with the recommendations in RFC 4222 (OSPF).

Receiver-based flow control (as proposed in https://datatracker.ietf.org/do=
c/draft-decraene-lsr-isis-flooding-speed/ )
requires protocol extensions and introduces additional signaling during
periods of high load. The asserted reason for this is to optimize throughpu=
t -
but there is no evidence that it will achieve this goal.

Mention has been made to TCP-like flow control mechanisms as a model - which
are indeed receiver based. However, there are significant differences betwe=
en
TCP sessions and IGP flooding.

TCP consists of a single session between two endpoints. Resources
(primarily buffer space) for this session are typically allocated in the
control plane and current usage is easily measurable..

IGP flooding is point-to-multi-point, resources to support IGP flooding
involve both control plane queues and dataplane queues, both of which are
typically not per interface - nor even dedicated to a particular protocol
instance. What input is required to optimize receiver-based flow control is=
 not fully specified.

https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/ su=
ggests (Section 5) that the values
to be advertised:

"use a formula based on an off line tests of
   the overall LSPDU processing speed for a particular set of hardware
   and the number of interfaces configured for IS-IS"

implying that the advertised value is intentionally not dynamic. As such,
it could just as easily be configured on the transmit side and not require
additional signaling. As a static value, it would necessarily be somewhat
conservative as it has to account for the worst case under the current
configuration - which means it needs to consider concurrent use of the CPU
and dataplane by all protocols/features which are enabled on a router - not=
 all of whose
use is likely to be synchronized with peak IS-IS flooding load.
[Bruno] _Assuming_ that the parameters are static, those parameters
o  are the same as the one implemented (configured) on multiple implementat=
ions, including the one from your employer. Now do you believe that those p=
arameters can be determined?
=A7  If yes, how do you do _today_ on your implementation? (this seems to c=
ontradict your statement that you have no way to figure out how to find the=
 right value)
=A7  If no, why did you implement those parameters, and ask network operato=
r to configure them?
=A7  There is also the option to reply: I don't know but don't care as I le=
ave the issue to the network operator.
o  can still provide some form of dynamicity, by using the PSNP as dynamic =
acknowledgement.
o  are really dependent on the receiver, not the sender.
=A7  the sender will never overload itself.
=A7  The receiver has more information,  knowing its processing power (low =
end, high end, 80s, 20s (currently we are stuck with 20 years old value ass=
uming the worst possible receiver (and worst there were, including with pac=
ket processing partly done in the control plane processor)), its expected I=
S-IS load (#neighbors), its preference for bursty LSP reception (high delay=
 between IS-IS CPU allocation cycles, memory not an issue up to x kilo-octe=
t...), its expected control plane load if IS-IS traffic has not higher prio=
rity over other control plane traffic...), it's expected level of QoS prior=
itization [1]
=B7      [1] looks for "Extended SPD Headroom". E.g. "Since IGP and link st=
ability are more tenuous and more crucial than BGP stability, such packets =
are now given the highest priority and are given extended SPD headroom with=
 a default of 10 packets. This means that these packets are not dropped if =
the size of the input hold queue is lower than 185 (input queue default siz=
e + spd headroom size + spd extended headroom)."
o  And this is for distributed architecture, 15 years ago. So what about us=
ing the above number (in the router configuration), applies Tony's proposal=
 (*oversubscription/number of IS neighbhors), and advertise this value to y=
our LSP sender?



[1] https://www.cisco.com/c/en/us/support/docs/routers/12000-series-routers=
/29920-spd.html

=B7
--Bruno


Unless a good case can be made as to why transmit-based flow control is not=
 a good
fit and why receiver-based flow control is demonstrably better, it seems
unnecessary to extend the protocol.

    Les


From: Lsr <lsr-bounces@ietf.org<mailto:lsr-bounces@ietf.org>> On Behalf Of =
Les Ginsberg (ginsberg)
Sent: Tuesday, February 18, 2020 6:25 PM
To: lsr@ietf.org<mailto:lsr@ietf.org>
Subject: [Lsr] Flow Control Discussion for IS-IS Flooding Speed

Two recent drafts advocate for the use of faster LSP flooding speeds in IS-=
IS:

https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/
https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/

There is strong agreement on two key points:

1)Modern networks require much faster flooding speeds than are commonly in =
use today

2)To deploy faster flooding speeds safely some form of flow control is need=
ed

The key point of contention between the two drafts is how flow control shou=
ld be implemented.

https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/ ad=
vocates for a receiver based flow control where the receiver advertises in =
hellos the parameters which indicate the rate/burst size which the receiver=
 is capable of supporting on the interface. Senders are required to limit t=
he rate of LSP transmission on that interface in accordance with the values=
 advertised by the receiver.

https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/  a=
dvocates for a transmit based flow control where the transmitter monitors t=
he number of unacknowledged LSPs sent on each interface and implements a ba=
ckoff algorithm to slow the rate of sending LSPs based on the length of the=
 per interface unacknowledged queue.

While other differences between the two drafts exist, it is fair to say tha=
t if agreement could be reached on the form of flow control  then it is lik=
ely other issues could be resolved easily.

This email starts the discussion regarding the flow control issue.




___________________________________________________________________________=
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/* List Definitions */
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</head>
<body lang=3D"FR" link=3D"blue" vlink=3D"purple" style=3D"tab-interval:35.4=
pt">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New =
Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">Les,<o:p></o:p></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New =
Roman&quot;;color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New =
Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">Thank you for this first=
 answer. This is
<span class=3D"SpellE">inline</span> with my understanding of the behavior.=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New =
Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">I wish some of the behav=
iors and values (e.g. queue size, rate limiting)
 could be shared. At minimum a range of typical values for platform which a=
re not end of sale. I don&#8217;t think this is secret. Actually, this is s=
omething that network provider would need in order to configure the right v=
alue for the parameters which are implemented
 on the platforms of your employer, so this should be on the public documen=
tation of your employer. One could also think that you may be proud of your=
 implementations and eager to show that it performs well.<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New =
Roman&quot;;color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New =
Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">Waiting some more detail=
s, as per you below email, the IS-IS receiver does
 have a queue, sometimes dedicated to IS-IS, but in general relatively dedi=
cated to very important and time sensitive traffic to the control plane. De=
tails are indeed implementation specific. But in general, this queue is des=
igned to protect the IS-IS traffic
 from lower priority traffic, e.g. <span class=3D"SpellE">bursty</span> BGP=
. So can we assume that the receiver have (or at least may have) such a que=
ue, and work with this?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New =
Roman&quot;;color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New =
Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">--Bruno<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New =
Roman&quot;;color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><b><span lang=3D"EN-US"=
 style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&=
quot;;mso-fareast-font-family:&quot;Times New Roman&quot;;mso-ansi-language=
:EN-US">From:</span></b><span lang=3D"EN-US" style=3D"font-size:10.0pt;font=
-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;mso-fareast-font-family:&=
quot;Times New Roman&quot;;mso-ansi-language:EN-US">
 Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] <br>
<b>Sent:</b> Friday, April 17, 2020 10:41 PM<br>
<b>To:</b> DECRAENE Bruno TGI/OLN<br>
</span><b><span style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&q=
uot;sans-serif&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;">C=
c:</span></b><span style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;=
,&quot;sans-serif&quot;;mso-fareast-font-family:&quot;Times New Roman&quot;=
"> lsr@ietf.org<br>
<span class=3D"SpellE"><b>Subject</b></span><b>:</b> RE: Flow Control Discu=
ssion for IS-IS
<span class=3D"SpellE">Flooding</span> Speed<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">Bruno &#8211;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">Returning to this old thread&#8230;<o:p></o=
:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">The following is a generic description of h=
ow receive path for IS-IS PDUs functions today &#8211; based on examination=
 of implementations on a variety of platforms
 from my employer. It is, for obvious reasons, &nbsp;generic and intentiona=
lly omits any discussion of implementation details.
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">But it is hopefully detailed enough to illu=
strate some of the challenges in regards to providing real-time&nbsp; accur=
ate feedback to the control plane that could
 be used by a receiver based flow control mechanism.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">Stage 1: Input Policing<o:p></o:p></span></=
p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">As a first step, a policer operates at ingr=
ess to rate limit the number of packets which will be punted for local proc=
essing. This typically operates in an interface
 independent manner - limiting the total number of packets per second acros=
s all interfaces.
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">The policer may rate limit different classe=
s of packets or simply limit all types of packets. A given platform may app=
ly a limit specific to IS-IS PDUs or apply
 a limit to a class of packets (e.g., OSPF&#43;BGP&#43;IS-IS combined).<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">Stage 2: Punt Queue Shaping<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">Received packets are then placed in a queue=
 for eventual transfer to the control plane. The number of queues varies. I=
n some cases a single queue for all packet
 types is used. In other cases packets are placed on different queues based=
 on packet classes.
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">Each queue is typically bounded to a maximu=
m number of packets. As the queue usage approaches a limit, shaping policie=
s are applied to prioritize certain packet
 types over others. <o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">An upper limit specific to IS-IS packets ma=
y be employed - or a limit may be applied to a larger class of packet types=
 of which IS-IS is only one of the packet
 types in the class.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">Stage 3: Transfer to control Plane<o:p></o:=
p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">Packets are then transferred to the control=
 plane. Control plane input queues may map 1-1 with the data plane queues o=
r map many to 1.
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">If the incoming packets are encapsulated (f=
or example GRE) they may be transferred to a media specific control plane q=
ueue to process the encapsulation header.
 In some cases encapsulation may be processed in the data plane prior to tr=
ansfer to the control plane.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">Stage 4: Transfer to IS-IS<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">Packets are then transferred to a queue whi=
ch is read directly by IS-IS. In the event there are multiple IS-IS instanc=
es, implementations may choose to have a
 shared queue which drives the execution of all instances or have instance =
specific queues filtered based on incoming interface.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">A single queue is typically used for all in=
terfaces and all IS-IS packet types. Subsequent processing may requeue pack=
ets based on packet type e.g., separating
 processing of hellos from processing of LSPs/SNPs.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">*********<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">A receiver based flow control mechanism whi=
ch attempts to make dynamic adjustments needs to obtain real-time feedback =
from one or more of the above stages. Monitoring
 the state of the input queue to IS-IS is easy to do, but would not account=
 for drops at previous stages.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">Obtaining feedback from earlier stages requ=
ires real-time updates from data plane to IS-IS in the control plane. This =
is much more challenging. Idiosyncrasies
 of platforms will have a significant impact on how to meaningfully interpr=
et and use the data. How to integrate data from the various stages &#8211; =
especially when the numbers are not specific to IS-IS packets &#8211; is no=
t intuitive.
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><a href=3D"https://tools.ietf.org/html/draf=
t-decraene-lsr-isis-flooding-speed-03">https://tools.ietf.org/html/draft-de=
craene-lsr-isis-flooding-speed-03</a> provides
 no guidance on how information from the dataplane could be used. <o:p></o:=
p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">As an alternative, it suggests that static =
parameters derived from offline tests could be advertised. But static param=
eters would necessarily have to be conservative
 as they would need to account for the worst case scenarios.<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">draft-ginsberg-lsr-isis-flooding-scale prop=
oses dynamic flow control based on the state of the transmitter. In this mo=
del, there is no dependency on platform
 implementation. The number of unacknowledged LSPs sent on an interface is =
used as input to the flow control algorithm. This accounts for all reasons =
why a receiver may be slow to acknowledge without requiring knowledge of wh=
ich stage(s) described above are
 affecting the receiver&#8217;s ability to provide timely acknowledgements.=
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">&nbsp;&nbsp; Les<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><b><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">From:</span></b><span lang=3D"EN-US" sty=
le=3D"mso-ansi-language:EN-US"> bruno.decraene@orange.com &lt;bruno.decraen=
e@orange.com&gt;
<br>
<b>Sent:</b> Wednesday, February 26, 2020 11:03 AM<br>
<b>To:</b> Les Ginsberg (ginsberg) &lt;ginsberg@cisco.com&gt;<br>
<b>Cc:</b> lsr@ietf.org<br>
<b>Subject:</b> RE: Flow Control Discussion for IS-IS Flooding Speed<o:p></=
o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"color:#1=
F497D">Les,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"color:#1=
F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"color:#1=
F497D">Please see inline[Bruno]<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"color:#1=
F497D"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><b><span style=3D"font-=
size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">From:</s=
pan></b><span style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quo=
t;sans-serif&quot;"> Lsr [<a href=3D"mailto:lsr-bounces@ietf.org">mailto:ls=
r-bounces@ietf.org</a>]
<b>On Behalf Of </b>Les Ginsberg (ginsberg)<br>
<b>Sent:</b> Wednesday, February 19, 2020 3:32 AM<br>
<b>To:</b> <a href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a><br>
<b>Subject:</b> Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed<=
o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">Base protocol operation of the Update proce=
ss tracks the flooding of<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">LSPs/interface and guarantees timer-based r=
etransmission on P2P interfaces<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">until an acknowledgment is received.<o:p></=
o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">Using this base protocol mechanism in combi=
nation with exponential backoff of the<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">retransmission timer provides flow control =
in the event of temporary overload<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">of the receiver.
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">This mechanism works without protocol exten=
sions, is dynamic, operates<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">independent of the reason for delayed ackno=
wledgment (dropped packets, CPU<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">overload), and does not require additional =
signaling during the overloaded<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">period.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">This is consistent with the recommendations=
 in RFC 4222 (OSPF).<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">Receiver-based flow control (as proposed in
<a href=3D"https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-floodin=
g-speed/">
https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/</a=
> )<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">requires protocol extensions and introduces=
 additional signaling during<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">periods of high load. The asserted reason f=
or this is to optimize throughput -<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">but there is no evidence that it will achie=
ve this goal.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">Mention has been made to TCP-like flow cont=
rol mechanisms as a model - which<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">are indeed receiver based. However, there a=
re significant differences between<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">TCP sessions and IGP flooding.<o:p></o:p></=
span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">TCP consists of a single session between tw=
o endpoints. Resources<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">(primarily buffer space) for this session a=
re typically allocated in the<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">control plane and current usage is easily m=
easurable..<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">IGP flooding is point-to-multi-point, resou=
rces to support IGP flooding<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">involve both control plane queues and datap=
lane queues, both of which are<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">typically not per interface - nor even dedi=
cated to a particular protocol<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">instance. What input is required to optimiz=
e receiver-based flow control is not fully specified.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><a href=3D"https://datatracker.ietf.org/doc=
/draft-decraene-lsr-isis-flooding-speed/">https://datatracker.ietf.org/doc/=
draft-decraene-lsr-isis-flooding-speed/</a>
 suggests (Section 5) that the values<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">to be advertised:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">&quot;use a formula based on an off line te=
sts of<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">&nbsp;&nbsp; the overall LSPDU processing s=
peed for a particular set of hardware<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">&nbsp;&nbsp; and the number of interfaces c=
onfigured for IS-IS&quot;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">implying that the advertised value is inten=
tionally not dynamic. As such,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">it could just as easily be configured on th=
e transmit side and not require<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">additional signaling. As a static value, it=
 would necessarily be somewhat<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">conservative as it has to account for the w=
orst case under the current<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">configuration - which means it needs to con=
sider concurrent use of the CPU<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">and dataplane by all protocols/features whi=
ch are enabled on a router - not all of whose<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">use is likely to be synchronized with peak =
IS-IS flooding load.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"color:#1F497D;mso-ansi-language:EN-US">[Bruno] _<i>Assuming</i>_ tha=
t the parameters are static, those parameters
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:107.4pt;text-indent:-18.0pt;mso=
-list:l4 level2 lfo1;tab-stops:list 107.4pt">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-size:10.0pt;mso-bid=
i-font-size:11.0pt;font-family:&quot;Courier New&quot;;mso-fareast-font-fam=
ily:&quot;Courier New&quot;;color:#1F497D;mso-ansi-language:EN-US"><span st=
yle=3D"mso-list:Ignore">o<span style=3D"font:7.0pt &quot;Times New Roman&qu=
ot;">&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"mso-fareast-fo=
nt-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US=
">are the same as the one implemented (configured) on multiple implementati=
ons, including the one from your employer. Now
 do you believe that those parameters can be determined?<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"margin-left:143.4pt;text-indent:-18.0pt;mso=
-list:l1 level3 lfo2;tab-stops:list 143.4pt">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-size:10.0pt;mso-bid=
i-font-size:11.0pt;font-family:Wingdings;mso-fareast-font-family:Wingdings;=
mso-bidi-font-family:Wingdings;color:#1F497D;mso-ansi-language:EN-US"><span=
 style=3D"mso-list:Ignore">=A7<span style=3D"font:7.0pt &quot;Times New Rom=
an&quot;">&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"mso-fareast-fo=
nt-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US=
">If yes, how do you do _<i>today</i>_ on your implementation? (this seems =
to contradict your statement that you have no
 way to figure out how to find the right value)<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:143.4pt;text-indent:-18.0pt;mso=
-list:l1 level3 lfo2;tab-stops:list 143.4pt">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-size:10.0pt;mso-bid=
i-font-size:11.0pt;font-family:Wingdings;mso-fareast-font-family:Wingdings;=
mso-bidi-font-family:Wingdings;color:#1F497D;mso-ansi-language:EN-US"><span=
 style=3D"mso-list:Ignore">=A7<span style=3D"font:7.0pt &quot;Times New Rom=
an&quot;">&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"mso-fareast-fo=
nt-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US=
">If no, why did you implement those parameters, and ask network operator t=
o configure them?<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:143.4pt;text-indent:-18.0pt;mso=
-list:l1 level3 lfo2;tab-stops:list 143.4pt">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-size:10.0pt;mso-bid=
i-font-size:11.0pt;font-family:Wingdings;mso-fareast-font-family:Wingdings;=
mso-bidi-font-family:Wingdings;color:#1F497D;mso-ansi-language:EN-US"><span=
 style=3D"mso-list:Ignore">=A7<span style=3D"font:7.0pt &quot;Times New Rom=
an&quot;">&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"mso-fareast-fo=
nt-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US=
">There is also the option to reply: I don&#8217;t know but don&#8217;t car=
e as I leave the issue to the network operator.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:107.4pt;text-indent:-18.0pt;mso=
-list:l5 level2 lfo3;tab-stops:list 107.4pt">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-size:10.0pt;mso-bid=
i-font-size:11.0pt;font-family:&quot;Courier New&quot;;mso-fareast-font-fam=
ily:&quot;Courier New&quot;;color:#1F497D;mso-ansi-language:EN-US"><span st=
yle=3D"mso-list:Ignore">o<span style=3D"font:7.0pt &quot;Times New Roman&qu=
ot;">&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"mso-fareast-fo=
nt-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US=
">can still provide some form of dynamicity, by using the PSNP as dynamic a=
cknowledgement.
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:107.4pt;text-indent:-18.0pt;mso=
-list:l5 level2 lfo3;tab-stops:list 107.4pt">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-size:10.0pt;mso-bid=
i-font-size:11.0pt;font-family:&quot;Courier New&quot;;mso-fareast-font-fam=
ily:&quot;Courier New&quot;;color:#1F497D;mso-ansi-language:EN-US"><span st=
yle=3D"mso-list:Ignore">o<span style=3D"font:7.0pt &quot;Times New Roman&qu=
ot;">&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"mso-fareast-fo=
nt-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US=
">are really dependent on the receiver, not the sender.<o:p></o:p></span></=
p>
<p class=3D"MsoNormal" style=3D"margin-left:143.4pt;text-indent:-18.0pt;mso=
-list:l0 level3 lfo4;tab-stops:list 143.4pt">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-size:10.0pt;mso-bid=
i-font-size:11.0pt;font-family:Wingdings;mso-fareast-font-family:Wingdings;=
mso-bidi-font-family:Wingdings;color:#1F497D;mso-ansi-language:EN-US"><span=
 style=3D"mso-list:Ignore">=A7<span style=3D"font:7.0pt &quot;Times New Rom=
an&quot;">&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"mso-fareast-fo=
nt-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US=
">the sender will never overload itself.
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:143.4pt;text-indent:-18.0pt;mso=
-list:l0 level3 lfo4;tab-stops:list 143.4pt">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-size:10.0pt;mso-bid=
i-font-size:11.0pt;font-family:Wingdings;mso-fareast-font-family:Wingdings;=
mso-bidi-font-family:Wingdings;color:#1F497D;mso-ansi-language:EN-US"><span=
 style=3D"mso-list:Ignore">=A7<span style=3D"font:7.0pt &quot;Times New Rom=
an&quot;">&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"mso-fareast-fo=
nt-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US=
">The receiver has more information,&nbsp; knowing its processing power (lo=
w end, high end, 80s, 20s (currently we are stuck with
 20 years old value assuming the worst possible receiver (and worst there w=
ere, including with packet processing partly done in the control plane proc=
essor)), its expected IS-IS load (#neighbors), its preference for bursty LS=
P reception (high delay between
 IS-IS CPU allocation cycles, memory not an issue up to x kilo-octet&#8230;=
), its expected control plane load if IS-IS traffic has not higher priority=
 over other control plane traffic&#8230;), it&#8217;s expected level of QoS=
 prioritization [1]<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:179.4pt;text-indent:-18.0pt;mso=
-list:l2 level4 lfo5;tab-stops:list 179.4pt">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-size:10.0pt;mso-bid=
i-font-size:11.0pt;font-family:Symbol;mso-fareast-font-family:Symbol;mso-bi=
di-font-family:Symbol;color:#1F497D;mso-ansi-language:EN-US"><span style=3D=
"mso-list:Ignore">=B7<span style=3D"font:7.0pt &quot;Times New Roman&quot;"=
>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"mso-fareast-fo=
nt-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US=
">[1] looks for &#8220;Extended SPD Headroom&#8221;. E.g. &#8220;</span><sp=
an lang=3D"EN-US" style=3D"mso-fareast-font-family:&quot;Times New Roman&qu=
ot;;mso-ansi-language:EN-US">Since
 IGP and link stability are more tenuous and more crucial than BGP stabilit=
y, such packets are now given the highest priority and are given extended S=
PD headroom with a default of 10 packets. This means that these packets are=
 not dropped if the size of the
 input hold queue is lower than 185 (input queue default size &#43; spd hea=
droom size &#43; spd extended headroom).&#8221;<span style=3D"color:#1F497D=
"><o:p></o:p></span></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:215.4pt;text-indent:-18.0pt;mso=
-list:l3 level5 lfo6;tab-stops:list 215.4pt">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-size:10.0pt;mso-bid=
i-font-size:11.0pt;font-family:&quot;Courier New&quot;;mso-fareast-font-fam=
ily:&quot;Courier New&quot;;color:#1F497D;mso-ansi-language:EN-US"><span st=
yle=3D"mso-list:Ignore">o<span style=3D"font:7.0pt &quot;Times New Roman&qu=
ot;">&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"mso-fareast-fo=
nt-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US=
">And this is for distributed architecture, 15 years ago. So what about usi=
ng the above number (in the router configuration),
 applies Tony&#8217;s proposal (*oversubscription/number of IS neighbhors),=
 and advertise this value to your LSP sender?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:71.4pt"><span lang=3D"EN=
-US" style=3D"color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:177.0pt"><span lang=3D"E=
N-US" style=3D"color:#1F497D;mso-ansi-language:EN-US">[1]
<a href=3D"https://www.cisco.com/c/en/us/support/docs/routers/12000-series-=
routers/29920-spd.html">
https://www.cisco.com/c/en/us/support/docs/routers/12000-series-routers/299=
20-spd.html</a>
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:71.4pt;text-indent:-18.0pt;mso-=
list:l6 level1 lfo7;tab-stops:list 71.4pt">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-size:10.0pt;mso-bid=
i-font-size:11.0pt;font-family:Symbol;mso-fareast-font-family:Symbol;mso-bi=
di-font-family:Symbol;color:#1F497D;mso-ansi-language:EN-US"><span style=3D=
"mso-list:Ignore">=B7<span style=3D"font:7.0pt &quot;Times New Roman&quot;"=
>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"mso-fareast-fo=
nt-family:&quot;Times New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US=
"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"color:#1F497D;mso-ansi-language:EN-US">--Bruno<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">Unless a good case can be made as to why tr=
ansmit-based flow control is not a good<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">fit and why receiver-based flow control is =
demonstrably better, it seems<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">unnecessary to extend the protocol.<o:p></o=
:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">&nbsp;&nbsp;&nbsp; Les<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><b><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">From:</span></b><span lang=3D"EN-US" sty=
le=3D"mso-ansi-language:EN-US"> Lsr &lt;<a href=3D"mailto:lsr-bounces@ietf.=
org">lsr-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Les Ginsberg (ginsberg)<br>
<b>Sent:</b> Tuesday, February 18, 2020 6:25 PM<br>
<b>To:</b> <a href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a><br>
<b>Subject:</b> [Lsr] Flow Control Discussion for IS-IS Flooding Speed<o:p>=
</o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">Two recent drafts advocate for the use of f=
aster LSP flooding speeds in IS-IS:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><a href=3D"https://datatracker.ietf.org/doc=
/draft-decraene-lsr-isis-flooding-speed/">https://datatracker.ietf.org/doc/=
draft-decraene-lsr-isis-flooding-speed/</a><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><a href=3D"https://datatracker.ietf.org/doc=
/draft-ginsberg-lsr-isis-flooding-scale/">https://datatracker.ietf.org/doc/=
draft-ginsberg-lsr-isis-flooding-scale/</a><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">There is strong agreement on two key points=
:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">1)Modern networks require much faster flood=
ing speeds than are commonly in use today<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">2)To deploy faster flooding speeds safely s=
ome form of flow control is needed<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">The key point of contention between the two=
 drafts is how flow control should be implemented.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><a href=3D"https://datatracker.ietf.org/doc=
/draft-decraene-lsr-isis-flooding-speed/">https://datatracker.ietf.org/doc/=
draft-decraene-lsr-isis-flooding-speed/</a>
 advocates for a receiver based flow control where the receiver advertises =
in hellos the parameters which indicate the rate/burst size which the recei=
ver is capable of supporting on the interface. Senders are required to limi=
t the rate of LSP transmission on
 that interface in accordance with the values advertised by the receiver.<o=
:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><a href=3D"https://datatracker.ietf.org/doc=
/draft-ginsberg-lsr-isis-flooding-scale/">https://datatracker.ietf.org/doc/=
draft-ginsberg-lsr-isis-flooding-scale/</a>
 &nbsp;advocates for a transmit based flow control where the transmitter mo=
nitors the number of unacknowledged LSPs sent on each interface and impleme=
nts a backoff algorithm to slow the rate of sending LSPs based on the lengt=
h of the per interface unacknowledged
 queue.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">While other differences between the two dra=
fts exist, it is fair to say that if agreement could be reached on the form=
 of flow control&nbsp; then it is likely other
 issues could be resolved easily.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">This email starts the discussion regarding =
the flow control issue.
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:70.8pt"><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
<pre style=3D"margin-left:35.4pt">_________________________________________=
___________________________________________________________________________=
_____<o:p></o:p></pre>
<pre style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></pre>
<pre style=3D"margin-left:35.4pt">Ce message et ses pieces jointes peuvent =
contenir des informations confidentielles ou privilegiees et ne doivent don=
c<o:p></o:p></pre>
<pre style=3D"margin-left:35.4pt">pas etre diffuses, exploites ou copies sa=
ns autorisation. Si vous avez recu ce message par erreur, veuillez le signa=
ler<o:p></o:p></pre>
<pre style=3D"margin-left:35.4pt">a l'expediteur et le detruire ainsi que l=
es pieces jointes. Les messages electroniques etant susceptibles d'alterati=
on,<o:p></o:p></pre>
<pre style=3D"margin-left:35.4pt">Orange decline toute responsabilite si ce=
 message a ete altere, deforme ou falsifie. Merci.<o:p></o:p></pre>
<pre style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></pre>
<pre style=3D"margin-left:35.4pt">This message and its attachments may cont=
ain confidential or privileged information that may be protected by law;<o:=
p></o:p></pre>
<pre style=3D"margin-left:35.4pt">they should not be distributed, used or c=
opied without authorisation.<o:p></o:p></pre>
<pre style=3D"margin-left:35.4pt">If you have received this email in error,=
 please notify the sender and delete this message and its attachments.<o:p>=
</o:p></pre>
<pre style=3D"margin-left:35.4pt">As emails may be altered, Orange is not l=
iable for messages that have been modified, changed or falsified.<o:p></o:p=
></pre>
<pre style=3D"margin-left:35.4pt">Thank you.<o:p></o:p></pre>
</div>
</div>
<PRE>______________________________________________________________________=
___________________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el=
ectroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
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CC: "lsr@ietf.org" <lsr@ietf.org>, "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>
Thread-Topic: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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Sender: Tony Li <tony1athome@gmail.com>
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To: Bruno Decraene <bruno.decraene@orange.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/Ke9px_JK3v9pwcT9y9gWW7skG7c>
Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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Bruno,

> Waiting some more details, as per you below email, the IS-IS receiver =
does have a queue, sometimes dedicated to IS-IS, but in general =
relatively dedicated to very important and time sensitive traffic to the =
control plane. Details are indeed implementation specific. But in =
general, this queue is designed to protect the IS-IS traffic from lower =
priority traffic, e.g. burstyBGP.. So can we assume that the receiver =
have (or at least may have) such a queue, and work with this?


That would be ideal, but probably not realistic. Not all implementations =
are going to have separate queues for BGP and IS-IS.

IMHO, that=E2=80=99s a very good thing, of course, but not all merchant =
silicon is quite that sophisticated. Yet. And it takes years to change, =
so it=E2=80=99s best that we proceed without.

Tony


--Apple-Mail=_0548B52A-8CB7-46DF-96B6-DDBE05C3F4AC
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D""><div =
class=3D""><br class=3D""></div>Bruno,<br class=3D""><div><br =
class=3D""><blockquote type=3D"cite" class=3D""><div style=3D"margin: =
0cm 0cm 0.0001pt; font-size: 11pt; font-family: Calibri, sans-serif; =
caret-color: rgb(0, 0, 0); font-style: normal; font-variant-caps: =
normal; font-weight: normal; letter-spacing: normal; text-align: start; =
text-indent: 0px; text-transform: none; white-space: normal; =
word-spacing: 0px; -webkit-text-stroke-width: 0px; text-decoration: =
none;" class=3D""><span lang=3D"EN-US" style=3D"color: rgb(31, 73, =
125);" class=3D"">Waiting some more details, as per you below email, the =
IS-IS receiver does have a queue, sometimes dedicated to IS-IS, but in =
general relatively dedicated to very important and time sensitive =
traffic to the control plane. Details are indeed implementation =
specific. But in general, this queue is designed to protect the IS-IS =
traffic from lower priority traffic, e.g.<span =
class=3D"Apple-converted-space">&nbsp;</span><span =
class=3D"SpellE">bursty</span>BGP.. So can we assume that the receiver =
have (or at least may have) such a queue, and work with =
this?</span></div></blockquote><div><br class=3D""></div><div><br =
class=3D""></div></div>That would be ideal, but probably not realistic. =
Not all implementations are going to have separate queues for BGP and =
IS-IS.<div class=3D""><br class=3D""></div><div class=3D"">IMHO, =
that=E2=80=99s a very good thing, of course, but not all merchant =
silicon is quite that sophisticated. Yet. And it takes years to change, =
so it=E2=80=99s best that we proceed without.</div><div class=3D""><br =
class=3D""></div><div class=3D"">Tony</div><div class=3D""><br =
class=3D""></div></body></html>=

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Date: Mon, 20 Apr 2020 09:49:54 -0700
Cc: Tony Przygienda <tonysietf@gmail.com>, "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>, "lsr@ietf.org" <lsr@ietf.org>
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References: <MW3PR11MB46191E81D5B22B454D8184A4C1100@MW3PR11MB4619.namprd11.prod.outlook.com> <MW3PR11MB461942C752F9CCB0A6E6C1BFC1100@MW3PR11MB4619.namprd11.prod.outlook.com> <15812_1582743802_5E56C0FA_15812_292_1_53C29892C857584299CBF5D05346208A48DB43B6@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <MW3PR11MB46198978E071B8C7E79770CEC1D90@MW3PR11MB4619.namprd11.prod.outlook.com> <CA+wi2hPn28KHm2Pzc5RNhT=qh7nzvJbiRco7N15U9QuE6NmYXQ@mail.gmail.com> <6288_1587386306_5E9D97C2_6288_247_1_53C29892C857584299CBF5D05346208A48E22C92@OPEXCAUBM43.corporate.adroot.infra.ftgroup>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/HOMbZDiUNu8CBpCtoOrlWRxOPzA>
Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed -- A plea for cooperation
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Gentlebeings,

This discussion is producing far more heat than light.  Can we please =
refocus our attentions?

I think that we all agree that the legacy parameters are no longer =
serving us well and that we need to reconsider our flooding parameters =
and mechanisms.

If we fail to reach a constructive consensus, we will end up with a =
protocol that severely underperforms, hurting our end user experience =
and allowing other
protocols to supplant what we=E2=80=99ve worked so hard for. It behooves =
us to all work together to find a common ground that allows all =
implementations to=20
converge rapidly.

At this point, arguing back and forth does not seem to be helping.

Our goal is to enable rapid flooding of a large LSP database. We need =
everyone to be able to do this. While it may help an implementation to =
be=20
rapid when operating with just itself, in today=E2=80=99s industrial =
environment, not being able to do this across implementations is not =
helpful. We need
all implementations to be able to be performant.

We have iterated on the points of the discussion repeatedly. Further =
repetition is not helpful. What is lacking is experimentation and facts.=20=

We need the results of running code. Packet traces with analysis of flow =
control mechanisms. Demonstrations of how particular parameters and
mechanisms perform across implementations and across hardware platform =
classes. Comparisons of our flooding mechanisms with the throughput=20
of other transport protocols.

What is going to help all platforms be their best?

Don=E2=80=99t just tell us what you think: prove it.

The competition is not the other implementation. It is other protocols =
who will supplant everything.

Regards,
Tony


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To: "Acee Lindem (acee)" <acee@cisco.com>, Peter Psenak <ppsenak@cisco.com>,  "draft-ietf-isis-mpls-elc@ietf.org" <draft-ietf-isis-mpls-elc@ietf.org>
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Subject: Re: [Lsr] AD Review of draft-ietf-isis-mpls-elc-10
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--00000000000046f98c05a3bd426c
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Peter:


I just looked at this document once more time and found an error in =C2=A75=
:
 s/The ERLD-MSD...[I-D.ietf-idr-bgp-ls-segment-routing-ext]./The
ERLD-MSD...[I-D.ietf-idr-bgp-ls-segment-routing-msd].


I am going to start the IETF LC, along with the OSPF document.  No need to
address this correction right away, we can wait until other LC comments
come in.

Thanks!!

Alvaro.

--00000000000046f98c05a3bd426c
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<html><head><style>body{font-family:Helvetica,Arial;font-size:13px}</style>=
</head><body style=3D"word-wrap:break-word"><div style=3D"font-family:Helve=
tica,Arial;font-size:13px">Peter:</div><div style=3D"font-family:Helvetica,=
Arial;font-size:13px"><br></div><div style=3D"font-family:Helvetica,Arial;f=
ont-size:13px"><br></div><div style=3D"font-family:Helvetica,Arial;font-siz=
e:13px">I just looked at this document once more time and found an error in=
 =C2=A75: =C2=A0s/The ERLD-MSD...[I-D.ietf-idr-bgp-ls-segment-routing-ext].=
/The ERLD-MSD...[I-D.ietf-idr-bgp-ls-segment-routing-msd].</div><div><br></=
div><div><br></div><div>I am going to start the IETF LC, along with the OSP=
F document.=C2=A0 No need to address this correction right away, we can wai=
t until other LC comments come in.</div><div><br></div><div>Thanks!!</div><=
div><br></div><div>Alvaro.</div></body></html>

--00000000000046f98c05a3bd426c--


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Cc: "Acee Lindem (acee)" <acee@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>,  "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>
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Subject: Re: [Lsr] AD Review of draft-ietf-ospf-mpls-elc-12
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Thanks Peter!

This document looks good to me.

I=E2=80=99m a starting the IETF LC, along with the ISIS document.

Alvaro.

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<html><head><style>body{font-family:Helvetica,Arial;font-size:13px}</style>=
</head><body style=3D"word-wrap:break-word"><div style=3D"font-family:Helve=
tica,Arial;font-size:13px"><br>Thanks Peter!</div><div style=3D"font-family=
:Helvetica,Arial;font-size:13px"><br></div><div style=3D"font-family:Helvet=
ica,Arial;font-size:13px">This document looks good to me.</div><div style=
=3D"font-family:Helvetica,Arial;font-size:13px"><br></div><div style=3D"fon=
t-family:Helvetica,Arial;font-size:13px">I=E2=80=99m a starting the IETF LC=
, along with the ISIS document.</div><div style=3D"font-family:Helvetica,Ar=
ial;font-size:13px"><br></div><div style=3D"font-family:Helvetica,Arial;fon=
t-size:13px">Alvaro.</div></body></html>

--000000000000278dc305a3bd459b--


From nobody Mon Apr 20 11:52:17 2020
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Subject: [Lsr] Last Call: <draft-ietf-isis-mpls-elc-11.txt> (Signaling Entropy Label Capability and Entropy Readable Label Depth Using IS-IS) to Proposed Standard
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The IESG has received a request from the Link State Routing WG (lsr) to
consider the following document: - 'Signaling Entropy Label Capability and
Entropy Readable Label Depth
   Using IS-IS'
  <draft-ietf-isis-mpls-elc-11.txt> as Proposed Standard

The IESG plans to make a decision in the next few weeks, and solicits final
comments on this action. Please send substantive comments to the
last-call@ietf.org mailing lists by 2020-05-05. Exceptionally, comments may
be sent to iesg@ietf.org instead. In either case, please retain the beginning
of the Subject line to allow automated sorting.

Abstract


   Multiprotocol Label Switching (MPLS) has defined a mechanism to load-
   balance traffic flows using Entropy Labels (EL).  An ingress Label
   Switching Router (LSR) cannot insert ELs for packets going into a
   given Label Switched Path (LSP) unless an egress LSR has indicated
   via signaling that it has the capability to process ELs, referred to
   as the Entropy Label Capability (ELC), on that tunnel.  In addition,
   it would be useful for ingress LSRs to know each LSR's capability for
   reading the maximum label stack depth and performing EL-based load-
   balancing, referred to as Entropy Readable Label Depth (ERLD).  This
   document defines a mechanism to signal these two capabilities using
   IS-IS.




The file can be obtained via
https://datatracker.ietf.org/doc/draft-ietf-isis-mpls-elc/

IESG discussion can be tracked via
https://datatracker.ietf.org/doc/draft-ietf-isis-mpls-elc/ballot/

The following IPR Declarations may be related to this I-D:

   https://datatracker.ietf.org/ipr/2311/







From nobody Mon Apr 20 11:57:39 2020
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Date: Mon, 20 Apr 2020 11:57:36 -0700
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Subject: [Lsr] Last Call: <draft-ietf-ospf-mpls-elc-13.txt> (Signaling Entropy Label Capability and Entropy Readable Label Depth Using OSPF) to Proposed Standard
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The IESG has received a request from the Link State Routing WG (lsr) to
consider the following document: - 'Signaling Entropy Label Capability and
Entropy Readable Label Depth
   Using OSPF'
  <draft-ietf-ospf-mpls-elc-13.txt> as Proposed Standard

The IESG plans to make a decision in the next few weeks, and solicits final
comments on this action. Please send substantive comments to the
last-call@ietf.org mailing lists by 2020-05-05. Exceptionally, comments may
be sent to iesg@ietf.org instead. In either case, please retain the beginning
of the Subject line to allow automated sorting.

Abstract


   Multiprotocol Label Switching (MPLS) has defined a mechanism to load-
   balance traffic flows using Entropy Labels (EL).  An ingress Label
   Switching Router (LSR) cannot insert ELs for packets going into a
   given Label Switched Path (LSP) unless an egress LSR has indicated
   via signaling that it has the capability to process ELs, referred to
   as the Entropy Label Capability (ELC), on that tunnel.  In addition,
   it would be useful for ingress LSRs to know each LSR's capability for
   reading the maximum label stack depth and performing EL-based load-
   balancing, referred to as Entropy Readable Label Depth (ERLD).  This
   document defines a mechanism to signal these two capabilities using
   OSPFv2 and OSPFv3.




The file can be obtained via
https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/

IESG discussion can be tracked via
https://datatracker.ietf.org/doc/draft-ietf-ospf-mpls-elc/ballot/

The following IPR Declarations may be related to this I-D:

   https://datatracker.ietf.org/ipr/2313/







From nobody Mon Apr 20 20:21:13 2020
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From: Sarah Chen <sarahchen@arista.com>
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Subject: [Lsr] Fwd: New Version Notification for draft-li-lsr-isis-area-proxy-04.txt
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--0000000000006d390005a3c481fb
Content-Type: text/plain; charset="UTF-8"

Hello,

We updated the IS-IS Area Proxy draft with more details on SRv6 and TE
support. We'd appreciate your comments.

Thanks,
Sarah

---------- Forwarded message ---------
From: <internet-drafts@ietf.org>
Date: Mon, Apr 20, 2020 at 12:46 PM
Subject: New Version Notification for draft-li-lsr-isis-area-proxy-04.txt
To: Tony Li <tony.li@tony.li>, Yunxia Chen <sarahchen@arista.com>



A new version of I-D, draft-li-lsr-isis-area-proxy-04.txt
has been successfully submitted by Sarah Chen and posted to the
IETF repository.

Name:           draft-li-lsr-isis-area-proxy
Revision:       04
Title:          Area Proxy for IS-IS
Document date:  2020-04-20
Group:          Individual Submission
Pages:          19
URL:
https://www.ietf.org/internet-drafts/draft-li-lsr-isis-area-proxy-04.txt
Status:
https://datatracker.ietf.org/doc/draft-li-lsr-isis-area-proxy/
Htmlized:       https://tools.ietf.org/html/draft-li-lsr-isis-area-proxy-04
Htmlized:
https://datatracker.ietf.org/doc/html/draft-li-lsr-isis-area-proxy
Diff:
https://www.ietf.org/rfcdiff?url2=draft-li-lsr-isis-area-proxy-04

Abstract:
   Link state routing protocols have hierarchical abstraction already
   built into them.  However, when lower levels are used for transit,
   they must expose their internal topologies to each other, leading to
   scale issues.

   To avoid this, this document discusses extensions to the IS-IS
   routing protocol that would allow level 1 areas to provide transit,
   yet only inject an abstraction of the level 1 topology into level 2.
   Each level 1 area is represented as a single level 2 node, thereby
   enabling greater scale.




Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

The IETF Secretariat

--0000000000006d390005a3c481fb
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-size:small">Hel=
lo,</div><div class=3D"gmail_default" style=3D"font-size:small"><br></div><=
div class=3D"gmail_default" style=3D"font-size:small">We updated the IS-IS =
Area Proxy draft with more details on SRv6 and TE support. We&#39;d appreci=
ate your comments.</div><div class=3D"gmail_default" style=3D"font-size:sma=
ll"><br></div><div class=3D"gmail_default" style=3D"font-size:small">Thanks=
,</div><div class=3D"gmail_default" style=3D"font-size:small">Sarah</div><b=
r><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">--------=
-- Forwarded message ---------<br>From: <span dir=3D"auto">&lt;<a href=3D"m=
ailto:internet-drafts@ietf.org" target=3D"_blank">internet-drafts@ietf.org<=
/a>&gt;</span><br>Date: Mon, Apr 20, 2020 at 12:46 PM<br>Subject: New Versi=
on Notification for draft-li-lsr-isis-area-proxy-04.txt<br>To: Tony Li &lt;=
<a href=3D"mailto:tony.li@tony.li" target=3D"_blank">tony.li@tony.li</a>&gt=
;, Yunxia Chen &lt;<a href=3D"mailto:sarahchen@arista.com" target=3D"_blank=
">sarahchen@arista.com</a>&gt;<br></div><br><br><br>
A new version of I-D, draft-li-lsr-isis-area-proxy-04.txt<br>
has been successfully submitted by Sarah Chen and posted to the<br>
IETF repository.<br>
<br>
Name:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0draft-li-lsr-isis-area-proxy<=
br>
Revision:=C2=A0 =C2=A0 =C2=A0 =C2=A004<br>
Title:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Area Proxy for IS-IS<br>
Document date:=C2=A0 2020-04-20<br>
Group:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 Individual Submission<br>
Pages:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 19<br>
URL:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 <a href=3D"https://www.ietf.o=
rg/internet-drafts/draft-li-lsr-isis-area-proxy-04.txt" rel=3D"noreferrer" =
target=3D"_blank">https://www.ietf.org/internet-drafts/draft-li-lsr-isis-ar=
ea-proxy-04.txt</a><br>
Status:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://datatracker.iet=
f.org/doc/draft-li-lsr-isis-area-proxy/" rel=3D"noreferrer" target=3D"_blan=
k">https://datatracker.ietf.org/doc/draft-li-lsr-isis-area-proxy/</a><br>
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://tools.ietf.org/html/=
draft-li-lsr-isis-area-proxy-04" rel=3D"noreferrer" target=3D"_blank">https=
://tools.ietf.org/html/draft-li-lsr-isis-area-proxy-04</a><br>
Htmlized:=C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://datatracker.ietf.org=
/doc/html/draft-li-lsr-isis-area-proxy" rel=3D"noreferrer" target=3D"_blank=
">https://datatracker.ietf.org/doc/html/draft-li-lsr-isis-area-proxy</a><br=
>
Diff:=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0<a href=3D"https://www.ietf.o=
rg/rfcdiff?url2=3Ddraft-li-lsr-isis-area-proxy-04" rel=3D"noreferrer" targe=
t=3D"_blank">https://www.ietf.org/rfcdiff?url2=3Ddraft-li-lsr-isis-area-pro=
xy-04</a><br>
<br>
Abstract:<br>
=C2=A0 =C2=A0Link state routing protocols have hierarchical abstraction alr=
eady<br>
=C2=A0 =C2=A0built into them.=C2=A0 However, when lower levels are used for=
 transit,<br>
=C2=A0 =C2=A0they must expose their internal topologies to each other, lead=
ing to<br>
=C2=A0 =C2=A0scale issues.<br>
<br>
=C2=A0 =C2=A0To avoid this, this document discusses extensions to the IS-IS=
<br>
=C2=A0 =C2=A0routing protocol that would allow level 1 areas to provide tra=
nsit,<br>
=C2=A0 =C2=A0yet only inject an abstraction of the level 1 topology into le=
vel 2.<br>
=C2=A0 =C2=A0Each level 1 area is represented as a single level 2 node, the=
reby<br>
=C2=A0 =C2=A0enabling greater scale.<br>
<br>
<br>
<br>
<br>
Please note that it may take a couple of minutes from the time of submissio=
n<br>
until the htmlized version and diff are available at <a href=3D"http://tool=
s.ietf.org" rel=3D"noreferrer" target=3D"_blank">tools.ietf.org</a>.<br>
<br>
The IETF Secretariat<br>
<br>
<br>
</div></div>

--0000000000006d390005a3c481fb--


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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "bruno.decraene@orange.com" <bruno.decraene@orange.com>
CC: "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: Flow Control Discussion for IS-IS Flooding Speed
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/FOjc-szni9ZJGxhFWajhiq8_k0U>
Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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--_000_MW3PR11MB46191D244D51A05F9AA4631DC1D50MW3PR11MB4619namp_
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Bruno -

You have made an assumption that historically vendors have tuned LSP transm=
ission rates to a platform specific value.
That certainly is not true in the case of my employer (happy to hear what o=
ther vendors have been doing for the past 20 years).

The default value is based on minimumBroadcastLSPTransmissionInterval speci=
fied in ISO10589.
A knob is available to allow tuning (faster or slower) in a given deploymen=
t - though in my experience this knob is rarely used.

We already discuss in https://tools.ietf.org/html/draft-ginsberg-lsr-isis-f=
looding-scale-02#section-2 that this common interpretation isn't the most a=
ppropriate, but historically the concern has been to avoid flooding too fas=
t - not to optimize flooding speed.
Obviously, we are revisiting that approach and saying it needs to change - =
which is something I think we have consensus on.

I have provided a description in my recent response as to why it is difficu=
lt to derive an optimal value on a per platform basis. You may disagree - b=
ut please do not claim that we actually have been doing this for years. We =
haven't been.

  Les

From: bruno.decraene@orange.com <bruno.decraene@orange.com>
Sent: Monday, April 20, 2020 4:47 AM
To: Les Ginsberg (ginsberg) <ginsberg@cisco.com>
Cc: lsr@ietf.org
Subject: RE: Flow Control Discussion for IS-IS Flooding Speed

Les,

After nearly 2 months, can we expect an answer from your side?

More specifically, the below question

[Bruno] _Assuming_ that the parameters are static, the parameters proposed =
in draft-decraene-lsr-isis-flooding-speed are the same as the one implement=
ed (configured) on multiple implementations, including the one from your em=
ployer.
Now do you believe that those parameters can be determined?

=A7  If yes, how do you do _today_ on your implementation? (this seems to c=
ontradict your statement that you have no way to figure out how to find the=
 right value)

=A7  If no, why did you implement those parameters, and ask network operato=
r to configure them?


Thank you,
--Bruno

From: DECRAENE Bruno TGI/OLN
Sent: Wednesday, February 26, 2020 8:03 PM
To: 'Les Ginsberg (ginsberg)'
Cc: lsr@ietf.org<mailto:lsr@ietf.org>
Subject: RE: Flow Control Discussion for IS-IS Flooding Speed

Les,

Please see inline[Bruno]

From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg (ginsberg=
)
Sent: Wednesday, February 19, 2020 3:32 AM
To: lsr@ietf.org<mailto:lsr@ietf.org>
Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed

Base protocol operation of the Update process tracks the flooding of
LSPs/interface and guarantees timer-based retransmission on P2P interfaces
until an acknowledgment is received.

Using this base protocol mechanism in combination with exponential backoff =
of the
retransmission timer provides flow control in the event of temporary overlo=
ad
of the receiver.

This mechanism works without protocol extensions, is dynamic, operates
independent of the reason for delayed acknowledgment (dropped packets, CPU
overload), and does not require additional signaling during the overloaded
period.

This is consistent with the recommendations in RFC 4222 (OSPF).

Receiver-based flow control (as proposed in https://datatracker.ietf.org/do=
c/draft-decraene-lsr-isis-flooding-speed/ )
requires protocol extensions and introduces additional signaling during
periods of high load. The asserted reason for this is to optimize throughpu=
t -
but there is no evidence that it will achieve this goal.

Mention has been made to TCP-like flow control mechanisms as a model - whic=
h
are indeed receiver based. However, there are significant differences betwe=
en
TCP sessions and IGP flooding.

TCP consists of a single session between two endpoints. Resources
(primarily buffer space) for this session are typically allocated in the
control plane and current usage is easily measurable..

IGP flooding is point-to-multi-point, resources to support IGP flooding
involve both control plane queues and dataplane queues, both of which are
typically not per interface - nor even dedicated to a particular protocol
instance. What input is required to optimize receiver-based flow control is=
 not fully specified.

https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/ su=
ggests (Section 5) that the values
to be advertised:

"use a formula based on an off line tests of
   the overall LSPDU processing speed for a particular set of hardware
   and the number of interfaces configured for IS-IS"

implying that the advertised value is intentionally not dynamic. As such,
it could just as easily be configured on the transmit side and not require
additional signaling. As a static value, it would necessarily be somewhat
conservative as it has to account for the worst case under the current
configuration - which means it needs to consider concurrent use of the CPU
and dataplane by all protocols/features which are enabled on a router - not=
 all of whose
use is likely to be synchronized with peak IS-IS flooding load.
[Bruno] _Assuming_ that the parameters are static, those parameters

o   are the same as the one implemented (configured) on multiple implementa=
tions, including the one from your employer. Now do you believe that those =
parameters can be determined?

=A7  If yes, how do you do _today_ on your implementation? (this seems to c=
ontradict your statement that you have no way to figure out how to find the=
 right value)

=A7  If no, why did you implement those parameters, and ask network operato=
r to configure them?

=A7  There is also the option to reply: I don't know but don't care as I le=
ave the issue to the network operator.

o   can still provide some form of dynamicity, by using the PSNP as dynamic=
 acknowledgement.

o   are really dependent on the receiver, not the sender.

=A7  the sender will never overload itself.

=A7  The receiver has more information,  knowing its processing power (low =
end, high end, 80s, 20s (currently we are stuck with 20 years old value ass=
uming the worst possible receiver (and worst there were, including with pac=
ket processing partly done in the control plane processor)), its expected I=
S-IS load (#neighbors), its preference for bursty LSP reception (high delay=
 between IS-IS CPU allocation cycles, memory not an issue up to x kilo-octe=
t...), its expected control plane load if IS-IS traffic has not higher prio=
rity over other control plane traffic...), it's expected level of QoS prior=
itization [1]

=B7          [1] looks for "Extended SPD Headroom". E.g. "Since IGP and lin=
k stability are more tenuous and more crucial than BGP stability, such pack=
ets are now given the highest priority and are given extended SPD headroom =
with a default of 10 packets. This means that these packets are not dropped=
 if the size of the input hold queue is lower than 185 (input queue default=
 size + spd headroom size + spd extended headroom)."

o   And this is for distributed architecture, 15 years ago. So what about u=
sing the above number (in the router configuration), applies Tony's proposa=
l (*oversubscription/number of IS neighbhors), and advertise this value to =
your LSP sender?



[1] https://www.cisco.com/c/en/us/support/docs/routers/12000-series-routers=
/29920-spd.html


-
--Bruno


Unless a good case can be made as to why transmit-based flow control is not=
 a good
fit and why receiver-based flow control is demonstrably better, it seems
unnecessary to extend the protocol.

    Les


From: Lsr <lsr-bounces@ietf.org<mailto:lsr-bounces@ietf.org>> On Behalf Of =
Les Ginsberg (ginsberg)
Sent: Tuesday, February 18, 2020 6:25 PM
To: lsr@ietf.org<mailto:lsr@ietf.org>
Subject: [Lsr] Flow Control Discussion for IS-IS Flooding Speed

Two recent drafts advocate for the use of faster LSP flooding speeds in IS-=
IS:

https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/
https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/

There is strong agreement on two key points:

1)Modern networks require much faster flooding speeds than are commonly in =
use today

2)To deploy faster flooding speeds safely some form of flow control is need=
ed

The key point of contention between the two drafts is how flow control shou=
ld be implemented.

https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/ ad=
vocates for a receiver based flow control where the receiver advertises in =
hellos the parameters which indicate the rate/burst size which the receiver=
 is capable of supporting on the interface. Senders are required to limit t=
he rate of LSP transmission on that interface in accordance with the values=
 advertised by the receiver.

https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/  a=
dvocates for a transmit based flow control where the transmitter monitors t=
he number of unacknowledged LSPs sent on each interface and implements a ba=
ckoff algorithm to slow the rate of sending LSPs based on the length of the=
 per interface unacknowledged queue.

While other differences between the two drafts exist, it is fair to say tha=
t if agreement could be reached on the form of flow control  then it is lik=
ely other issues could be resolved easily.

This email starts the discussion regarding the flow control issue.




___________________________________________________________________________=
______________________________________________



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<body lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"WordSection1">
<p class=3D"MsoNormal">Bruno &#8211;<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">You have made an assumption that historically vendor=
s have tuned LSP transmission rates to a platform specific value.<o:p></o:p=
></p>
<p class=3D"MsoNormal">That certainly is not true in the case of my employe=
r (happy to hear what other vendors have been doing for the past 20 years).=
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The default value is based on minimumBroadcastLSPTra=
nsmissionInterval specified in ISO10589.<o:p></o:p></p>
<p class=3D"MsoNormal">A knob is available to allow tuning (faster or slowe=
r) in a given deployment &#8211; though in my experience this knob is rarel=
y used.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">We already discuss in <a href=3D"https://tools.ietf.=
org/html/draft-ginsberg-lsr-isis-flooding-scale-02#section-2">
https://tools.ietf.org/html/draft-ginsberg-lsr-isis-flooding-scale-02#secti=
on-2</a> that this common interpretation isn&#8217;t the most appropriate, =
but historically the concern has been to avoid flooding too fast &#8211; no=
t to optimize flooding speed.<o:p></o:p></p>
<p class=3D"MsoNormal">Obviously, we are revisiting that approach and sayin=
g it needs to change &#8211; which is something I think we have consensus o=
n.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I have provided a description in my recent response =
as to why it is difficult to derive an optimal value on a per platform basi=
s. You may disagree &#8211; but please do not claim that we actually have b=
een doing this for years. We haven&#8217;t been.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">&nbsp; Les<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> bruno.decraene@orange.com &lt;bruno.dec=
raene@orange.com&gt;
<br>
<b>Sent:</b> Monday, April 20, 2020 4:47 AM<br>
<b>To:</b> Les Ginsberg (ginsberg) &lt;ginsberg@cisco.com&gt;<br>
<b>Cc:</b> lsr@ietf.org<br>
<b>Subject:</b> RE: Flow Control Discussion for IS-IS Flooding Speed<o:p></=
o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Les,<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">After nearly 2 months,=
 can we expect an answer from your side?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">More specifically, the=
 below question<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">[Bruno] _Assuming_ that the parameters are static, the par=
ameters proposed in draft-decraene-lsr-isis-flooding-speed are the same as =
the one implemented (configured) on multiple implementations,
 including the one from your employer.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">Now do you believe that those parameters can be determined=
?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">=A7&nbsp; If yes, how do you do _today_ on your implementa=
tion? (this seems to contradict your statement that you have no way to figu=
re out how to find the right value)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;">=A7&nbsp; If no, why did you implement those parameters, a=
nd ask network operator to configure them?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Thank you,<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">--Bruno<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><b><span lang=3D"FR" st=
yle=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif">From:</s=
pan></b><span lang=3D"FR" style=3D"font-size:10.0pt;font-family:&quot;Tahom=
a&quot;,sans-serif"> DECRAENE Bruno TGI/OLN
<br>
<b>Sent:</b> Wednesday, February 26, 2020 8:03 PM<br>
<b>To:</b> 'Les Ginsberg (ginsberg)'<br>
<b>Cc:</b> <a href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a><br>
<b>Subject:</b> RE: Flow Control Discussion for IS-IS Flooding Speed<o:p></=
o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"FR"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"FR" style=
=3D"color:#1F497D">Les,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"FR" style=
=3D"color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"FR" style=
=3D"color:#1F497D">Please see inline[Bruno]<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"FR" style=
=3D"color:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><b><span lang=3D"FR" st=
yle=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,sans-serif">From:</s=
pan></b><span lang=3D"FR" style=3D"font-size:10.0pt;font-family:&quot;Tahom=
a&quot;,sans-serif"> Lsr [<a href=3D"mailto:lsr-bounces@ietf.org">mailto:ls=
r-bounces@ietf.org</a>]
<b>On Behalf Of </b>Les Ginsberg (ginsberg)<br>
<b>Sent:</b> Wednesday, February 19, 2020 3:32 AM<br>
<b>To:</b> <a href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a><br>
<b>Subject:</b> Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed<=
o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"FR"><o:p>=
&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">Base protocol operation=
 of the Update process tracks the flooding of<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">LSPs/interface and guar=
antees timer-based retransmission on P2P interfaces<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">until an acknowledgment=
 is received.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">Using this base protoco=
l mechanism in combination with exponential backoff of the<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">retransmission timer pr=
ovides flow control in the event of temporary overload<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">of the receiver. <o:p><=
/o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">This mechanism works wi=
thout protocol extensions, is dynamic, operates<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">independent of the reas=
on for delayed acknowledgment (dropped packets, CPU<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">overload), and does not=
 require additional signaling during the overloaded<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">period.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">This is consistent with=
 the recommendations in RFC 4222 (OSPF).<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">Receiver-based flow con=
trol (as proposed in
<a href=3D"https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-floodin=
g-speed/">
https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/</a=
> )<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">requires protocol exten=
sions and introduces additional signaling during<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">periods of high load. T=
he asserted reason for this is to optimize throughput -<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">but there is no evidenc=
e that it will achieve this goal.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">Mention has been made t=
o TCP-like flow control mechanisms as a model - which<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">are indeed receiver bas=
ed. However, there are significant differences between<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">TCP sessions and IGP fl=
ooding.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">TCP consists of a singl=
e session between two endpoints. Resources<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">(primarily buffer space=
) for this session are typically allocated in the<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">control plane and curre=
nt usage is easily measurable..<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">IGP flooding is point-t=
o-multi-point, resources to support IGP flooding<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">involve both control pl=
ane queues and dataplane queues, both of which are<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">typically not per inter=
face - nor even dedicated to a particular protocol<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">instance. What input is=
 required to optimize receiver-based flow control is not fully specified.<o=
:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><a href=3D"https://data=
tracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/">https://datat=
racker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/</a> suggests (S=
ection 5) that the values<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">to be advertised:<o:p><=
/o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">&quot;use a formula bas=
ed on an off line tests of<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">&nbsp;&nbsp; the overal=
l LSPDU processing speed for a particular set of hardware<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">&nbsp;&nbsp; and the nu=
mber of interfaces configured for IS-IS&quot;<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">implying that the adver=
tised value is intentionally not dynamic. As such,<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">it could just as easily=
 be configured on the transmit side and not require<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">additional signaling. A=
s a static value, it would necessarily be somewhat<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">conservative as it has =
to account for the worst case under the current<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">configuration - which m=
eans it needs to consider concurrent use of the CPU<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">and dataplane by all pr=
otocols/features which are enabled on a router - not all of whose<o:p></o:p=
></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">use is likely to be syn=
chronized with peak IS-IS flooding load.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"color:#1=
F497D">[Bruno] _<i>Assuming</i>_ that the parameters are static, those para=
meters
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:107.4pt;text-indent:-.25=
in;mso-list:l0 level2 lfo2">
<![if !supportLists]><span style=3D"font-family:&quot;Courier New&quot;;col=
or:#1F497D"><span style=3D"mso-list:Ignore">o<span style=3D"font:7.0pt &quo=
t;Times New Roman&quot;">&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D">are the same a=
s the one implemented (configured) on multiple implementations, including t=
he one from your employer. Now do you believe that those parameters can be =
determined?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:143.4pt;text-indent:-.25=
in;mso-list:l0 level3 lfo2">
<![if !supportLists]><span style=3D"font-family:Wingdings;color:#1F497D"><s=
pan style=3D"mso-list:Ignore">=A7<span style=3D"font:7.0pt &quot;Times New =
Roman&quot;">&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D">If yes, how do=
 you do _<i>today</i>_ on your implementation? (this seems to contradict yo=
ur statement that you have no way to figure out how to find the right value=
)<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:143.4pt;text-indent:-.25=
in;mso-list:l0 level3 lfo2">
<![if !supportLists]><span style=3D"font-family:Wingdings;color:#1F497D"><s=
pan style=3D"mso-list:Ignore">=A7<span style=3D"font:7.0pt &quot;Times New =
Roman&quot;">&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D">If no, why did=
 you implement those parameters, and ask network operator to configure them=
?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:143.4pt;text-indent:-.25=
in;mso-list:l0 level3 lfo2">
<![if !supportLists]><span style=3D"font-family:Wingdings;color:#1F497D"><s=
pan style=3D"mso-list:Ignore">=A7<span style=3D"font:7.0pt &quot;Times New =
Roman&quot;">&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D">There is also =
the option to reply: I don&#8217;t know but don&#8217;t care as I leave the=
 issue to the network operator.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:107.4pt;text-indent:-.25=
in;mso-list:l0 level2 lfo2">
<![if !supportLists]><span style=3D"font-family:&quot;Courier New&quot;;col=
or:#1F497D"><span style=3D"mso-list:Ignore">o<span style=3D"font:7.0pt &quo=
t;Times New Roman&quot;">&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D">can still prov=
ide some form of dynamicity, by using the PSNP as dynamic acknowledgement.
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:107.4pt;text-indent:-.25=
in;mso-list:l0 level2 lfo2">
<![if !supportLists]><span style=3D"font-family:&quot;Courier New&quot;;col=
or:#1F497D"><span style=3D"mso-list:Ignore">o<span style=3D"font:7.0pt &quo=
t;Times New Roman&quot;">&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D">are really dep=
endent on the receiver, not the sender.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:143.4pt;text-indent:-.25=
in;mso-list:l0 level3 lfo2">
<![if !supportLists]><span style=3D"font-family:Wingdings;color:#1F497D"><s=
pan style=3D"mso-list:Ignore">=A7<span style=3D"font:7.0pt &quot;Times New =
Roman&quot;">&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D">the sender wil=
l never overload itself.
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:143.4pt;text-indent:-.25=
in;mso-list:l0 level3 lfo2">
<![if !supportLists]><span style=3D"font-family:Wingdings;color:#1F497D"><s=
pan style=3D"mso-list:Ignore">=A7<span style=3D"font:7.0pt &quot;Times New =
Roman&quot;">&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D">The receiver h=
as more information,&nbsp; knowing its processing power (low end, high end,=
 80s, 20s (currently we are stuck with 20 years old value assuming the wors=
t possible receiver (and worst there were,
 including with packet processing partly done in the control plane processo=
r)), its expected IS-IS load (#neighbors), its preference for bursty LSP re=
ception (high delay between IS-IS CPU allocation cycles, memory not an issu=
e up to x kilo-octet&#8230;), its expected
 control plane load if IS-IS traffic has not higher priority over other con=
trol plane traffic&#8230;), it&#8217;s expected level of QoS prioritization=
 [1]<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:179.4pt;text-indent:-.25=
in;mso-list:l0 level4 lfo2">
<![if !supportLists]><span style=3D"font-family:Symbol;color:#1F497D"><span=
 style=3D"mso-list:Ignore">=B7<span style=3D"font:7.0pt &quot;Times New Rom=
an&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D">&nbsp;[1] look=
s for &#8220;Extended SPD Headroom&#8221;. E.g. &#8220;</span>Since IGP and=
 link stability are more tenuous and more crucial than BGP stability, such =
packets are now given the highest priority and are given
 extended SPD headroom with a default of 10 packets. This means that these =
packets are not dropped if the size of the input hold queue is lower than 1=
85 (input queue default size &#43; spd headroom size &#43; spd extended hea=
droom).&#8221;<span style=3D"color:#1F497D"><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:215.4pt;text-indent:-.25=
in;mso-list:l0 level5 lfo2">
<![if !supportLists]><span style=3D"font-family:&quot;Courier New&quot;;col=
or:#1F497D"><span style=3D"mso-list:Ignore">o<span style=3D"font:7.0pt &quo=
t;Times New Roman&quot;">&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D">And this is fo=
r distributed architecture, 15 years ago. So what about using the above num=
ber (in the router configuration), applies Tony&#8217;s proposal (*oversubs=
cription/number of IS neighbhors), and advertise
 this value to your LSP sender?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:71.4pt"><span style=3D"c=
olor:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:177.0pt"><span style=3D"=
color:#1F497D">[1]
<a href=3D"https://www.cisco.com/c/en/us/support/docs/routers/12000-series-=
routers/29920-spd.html">
https://www.cisco.com/c/en/us/support/docs/routers/12000-series-routers/299=
20-spd.html</a>
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"color:#1=
F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:71.4pt;text-indent:-.25i=
n;mso-list:l0 level1 lfo2">
<![if !supportLists]><span style=3D"color:#1F497D"><span style=3D"mso-list:=
Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D"><o:p>&nbsp;</o=
:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span style=3D"color:#1=
F497D">--Bruno<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span style=3D"color:#1=
F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span style=3D"color:#1=
F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">Unless a good case can =
be made as to why transmit-based flow control is not a good<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">fit and why receiver-ba=
sed flow control is demonstrably better, it seems<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">unnecessary to extend t=
he protocol.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">&nbsp;&nbsp;&nbsp; Les<=
o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><o:p>&nbsp;</o:p></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><b>From:</b> Lsr &lt;<a=
 href=3D"mailto:lsr-bounces@ietf.org">lsr-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Les Ginsberg (ginsberg)<br>
<b>Sent:</b> Tuesday, February 18, 2020 6:25 PM<br>
<b>To:</b> <a href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a><br>
<b>Subject:</b> [Lsr] Flow Control Discussion for IS-IS Flooding Speed<o:p>=
</o:p></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">Two recent drafts advoc=
ate for the use of faster LSP flooding speeds in IS-IS:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><a href=3D"https://data=
tracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/">https://datat=
racker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/</a><o:p></o:p><=
/p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><a href=3D"https://data=
tracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/">https://datat=
racker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/</a><o:p></o:p><=
/p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">There is strong agreeme=
nt on two key points:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">1)Modern networks requi=
re much faster flooding speeds than are commonly in use today<o:p></o:p></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">2)To deploy faster floo=
ding speeds safely some form of flow control is needed<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">The key point of conten=
tion between the two drafts is how flow control should be implemented.<o:p>=
</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><a href=3D"https://data=
tracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/">https://datat=
racker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/</a> advocates f=
or a receiver based flow control where
 the receiver advertises in hellos the parameters which indicate the rate/b=
urst size which the receiver is capable of supporting on the interface. Sen=
ders are required to limit the rate of LSP transmission on that interface i=
n accordance with the values advertised
 by the receiver.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><a href=3D"https://data=
tracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/">https://datat=
racker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/</a> &nbsp;advoc=
ates for a transmit based flow control where
 the transmitter monitors the number of unacknowledged LSPs sent on each in=
terface and implements a backoff algorithm to slow the rate of sending LSPs=
 based on the length of the per interface unacknowledged queue.<o:p></o:p><=
/p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">While other differences=
 between the two drafts exist, it is fair to say that if agreement could be=
 reached on the form of flow control&nbsp; then it is likely other issues c=
ould be resolved easily.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">This email starts the d=
iscussion regarding the flow control issue.
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText" style=3D"margin-left:70.8pt"><o:p>&nbsp;</o:p></p=
>
</div>
<pre><span lang=3D"FR">____________________________________________________=
_____________________________________________________________________<o:p><=
/o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
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tion. Si vous avez recu ce message par erreur, veuillez le signaler<o:p></o=
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<pre><span lang=3D"FR">a l'expediteur et le detruire ainsi que les pieces j=
ointes. Les messages electroniques etant susceptibles d'alteration,<o:p></o=
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<pre><span lang=3D"FR">Orange decline toute responsabilite si ce message a =
ete altere, deforme ou falsifie. Merci.<o:p></o:p></span></pre>
<pre><span lang=3D"FR"><o:p>&nbsp;</o:p></span></pre>
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<pre><span lang=3D"FR">If you have received this email in error, please not=
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From: Tony Przygienda <tonysietf@gmail.com>
Date: Tue, 21 Apr 2020 16:19:13 -0700
Message-ID: <CA+wi2hN2A3oZcZWngNjBnZ214jiGNfqyTZpytpK0jrxH68SnqQ@mail.gmail.com>
To: "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>
Cc: "bruno.decraene@orange.com" <bruno.decraene@orange.com>, "lsr@ietf.org" <lsr@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/RA6BMmECVsy-Swdy9rOOeTsXEVg>
Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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neither am I aware of anything like this (i.e. per platform/product
flooding rate constants) in any major vendor stack for whatever that's
worth. It's simply unmaintanable, point. All major vendors have extensive
product lines over so many changing hardware configuration/setups it is
simply not viable to attempt precise measurements (and even then, user
changing config can throw the stuff off in a millisecond). There may have
been here and there per deployment scenario some "recommended config" (not
something I immediately recall either) but that means very fixed
configuration of things & how they go into networks and even then I'm not
aware of anyone having had a "precise model of the chain in the box". yes,
probes to measure lots and lots of stuff in the boxes exist but again,
those are chip/linecard/backplane/chassis/routing engine specific and
mostly used in complex test/peformance scenarios and not to derive some
kind of equations that can predict anything much ...

Bruno, if you're so deeply interested in that stuff we can talk 1:1
off-line about implementation work on rift towards adapatable flooding rate
(algorithm you see in the -02 draft Les put out is a _very rough_
approximation of that BTW. I joined as co-author after we had some very
fruitful discussions and I consider the draft close to what can be
_realistically_ done  today in ISIS. I don't consider further details
generic enough to merit wide forum discussions). And RIFT put a couple of
things into packet formats we can't put into ISIS (I talked with Les about
it) to improve the adaptability of the flooding rate BTW and some
interesting, coarse indication from receiver. Again, this is not a constant
that is calculated, it's all adaptive driven almost completely from the
transmitter side and the feedback it gathers.

all my very own 2c

-- tony

On Tue, Apr 21, 2020 at 2:48 PM Les Ginsberg (ginsberg) <ginsberg=3D
40cisco.com@dmarc.ietf.org> wrote:

> Bruno =E2=80=93
>
>
>
> You have made an assumption that historically vendors have tuned LSP
> transmission rates to a platform specific value.
>
> That certainly is not true in the case of my employer (happy to hear what
> other vendors have been doing for the past 20 years).
>
>
>
> The default value is based on minimumBroadcastLSPTransmissionInterval
> specified in ISO10589.
>
> A knob is available to allow tuning (faster or slower) in a given
> deployment =E2=80=93 though in my experience this knob is rarely used.
>
>
>
> We already discuss in
> https://tools.ietf.org/html/draft-ginsberg-lsr-isis-flooding-scale-02#sec=
tion-2
> that this common interpretation isn=E2=80=99t the most appropriate, but
> historically the concern has been to avoid flooding too fast =E2=80=93 no=
t to
> optimize flooding speed.
>
> Obviously, we are revisiting that approach and saying it needs to change =
=E2=80=93
> which is something I think we have consensus on.
>
>
>
> I have provided a description in my recent response as to why it is
> difficult to derive an optimal value on a per platform basis. You may
> disagree =E2=80=93 but please do not claim that we actually have been doi=
ng this
> for years. We haven=E2=80=99t been.
>
>
>
>   Les
>
>
>
> *From:* bruno.decraene@orange.com <bruno.decraene@orange.com>
> *Sent:* Monday, April 20, 2020 4:47 AM
> *To:* Les Ginsberg (ginsberg) <ginsberg@cisco.com>
> *Cc:* lsr@ietf.org
> *Subject:* RE: Flow Control Discussion for IS-IS Flooding Speed
>
>
>
> Les,
>
>
>
> After nearly 2 months, can we expect an answer from your side?
>
>
>
> More specifically, the below question
>
>
>
> [Bruno] _Assuming_ that the parameters are static, the parameters propose=
d
> in draft-decraene-lsr-isis-flooding-speed are the same as the one
> implemented (configured) on multiple implementations, including the one
> from your employer.
>
> Now do you believe that those parameters can be determined?
>
>
>
> =C2=A7  If yes, how do you do _today_ on your implementation? (this seems=
 to
> contradict your statement that you have no way to figure out how to find
> the right value)
>
>
>
> =C2=A7  If no, why did you implement those parameters, and ask network op=
erator
> to configure them?
>
>
>
>
>
> Thank you,
>
> --Bruno
>
>
>
> *From:* DECRAENE Bruno TGI/OLN
> *Sent:* Wednesday, February 26, 2020 8:03 PM
> *To:* 'Les Ginsberg (ginsberg)'
> *Cc:* lsr@ietf.org
> *Subject:* RE: Flow Control Discussion for IS-IS Flooding Speed
>
>
>
> Les,
>
>
>
> Please see inline[Bruno]
>
>
>
> *From:* Lsr [mailto:lsr-bounces@ietf.org <lsr-bounces@ietf.org>] *On
> Behalf Of *Les Ginsberg (ginsberg)
> *Sent:* Wednesday, February 19, 2020 3:32 AM
> *To:* lsr@ietf.org
> *Subject:* Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
>
>
>
> Base protocol operation of the Update process tracks the flooding of
>
> LSPs/interface and guarantees timer-based retransmission on P2P interface=
s
>
> until an acknowledgment is received.
>
>
>
> Using this base protocol mechanism in combination with exponential backof=
f
> of the
>
> retransmission timer provides flow control in the event of temporary
> overload
>
> of the receiver.
>
>
>
> This mechanism works without protocol extensions, is dynamic, operates
>
> independent of the reason for delayed acknowledgment (dropped packets, CP=
U
>
> overload), and does not require additional signaling during the overloade=
d
>
> period.
>
>
>
> This is consistent with the recommendations in RFC 4222 (OSPF).
>
>
>
> Receiver-based flow control (as proposed in
> https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/ =
)
>
> requires protocol extensions and introduces additional signaling during
>
> periods of high load. The asserted reason for this is to optimize
> throughput -
>
> but there is no evidence that it will achieve this goal.
>
>
>
> Mention has been made to TCP-like flow control mechanisms as a model -
> which
>
> are indeed receiver based. However, there are significant differences
> between
>
> TCP sessions and IGP flooding.
>
>
>
> TCP consists of a single session between two endpoints. Resources
>
> (primarily buffer space) for this session are typically allocated in the
>
> control plane and current usage is easily measurable..
>
>
>
> IGP flooding is point-to-multi-point, resources to support IGP flooding
>
> involve both control plane queues and dataplane queues, both of which are
>
> typically not per interface - nor even dedicated to a particular protocol
>
> instance. What input is required to optimize receiver-based flow control
> is not fully specified.
>
>
>
> https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/
> suggests (Section 5) that the values
>
> to be advertised:
>
>
>
> "use a formula based on an off line tests of
>
>    the overall LSPDU processing speed for a particular set of hardware
>
>    and the number of interfaces configured for IS-IS"
>
>
>
> implying that the advertised value is intentionally not dynamic. As such,
>
> it could just as easily be configured on the transmit side and not requir=
e
>
> additional signaling. As a static value, it would necessarily be somewhat
>
> conservative as it has to account for the worst case under the current
>
> configuration - which means it needs to consider concurrent use of the CP=
U
>
> and dataplane by all protocols/features which are enabled on a router -
> not all of whose
>
> use is likely to be synchronized with peak IS-IS flooding load.
>
> [Bruno] _*Assuming*_ that the parameters are static, those parameters
>
> o   are the same as the one implemented (configured) on multiple
> implementations, including the one from your employer. Now do you believe
> that those parameters can be determined?
>
> =C2=A7  If yes, how do you do _*today*_ on your implementation? (this see=
ms to
> contradict your statement that you have no way to figure out how to find
> the right value)
>
> =C2=A7  If no, why did you implement those parameters, and ask network
> operator to configure them?
>
> =C2=A7  There is also the option to reply: I don=E2=80=99t know but don=
=E2=80=99t care as I
> leave the issue to the network operator.
>
> o   can still provide some form of dynamicity, by using the PSNP as
> dynamic acknowledgement.
>
> o   are really dependent on the receiver, not the sender.
>
> =C2=A7  the sender will never overload itself.
>
> =C2=A7  The receiver has more information,  knowing its processing power =
(low
> end, high end, 80s, 20s (currently we are stuck with 20 years old value
> assuming the worst possible receiver (and worst there were, including wit=
h
> packet processing partly done in the control plane processor)), its
> expected IS-IS load (#neighbors), its preference for bursty LSP reception
> (high delay between IS-IS CPU allocation cycles, memory not an issue up t=
o
> x kilo-octet=E2=80=A6), its expected control plane load if IS-IS traffic =
has not
> higher priority over other control plane traffic=E2=80=A6), it=E2=80=99s =
expected level of
> QoS prioritization [1]
>
> =C2=B7          [1] looks for =E2=80=9CExtended SPD Headroom=E2=80=9D. E.=
g. =E2=80=9CSince IGP and
> link stability are more tenuous and more crucial than BGP stability, such
> packets are now given the highest priority and are given extended SPD
> headroom with a default of 10 packets. This means that these packets are
> not dropped if the size of the input hold queue is lower than 185 (input
> queue default size + spd headroom size + spd extended headroom).=E2=80=9D
>
> o   And this is for distributed architecture, 15 years ago. So what about
> using the above number (in the router configuration), applies Tony=E2=80=
=99s
> proposal (*oversubscription/number of IS neighbhors), and advertise this
> value to your LSP sender?
>
>
>
> [1]
> https://www.cisco.com/c/en/us/support/docs/routers/12000-series-routers/2=
9920-spd.html
>
>
>
> -
>
> --Bruno
>
>
>
>
>
> Unless a good case can be made as to why transmit-based flow control is
> not a good
>
> fit and why receiver-based flow control is demonstrably better, it seems
>
> unnecessary to extend the protocol.
>
>
>
>     Les
>
>
>
>
>
> *From:* Lsr <lsr-bounces@ietf.org> *On Behalf Of *Les Ginsberg (ginsberg)
> *Sent:* Tuesday, February 18, 2020 6:25 PM
> *To:* lsr@ietf.org
> *Subject:* [Lsr] Flow Control Discussion for IS-IS Flooding Speed
>
>
>
> Two recent drafts advocate for the use of faster LSP flooding speeds in
> IS-IS:
>
>
>
> https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/
>
> https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/
>
>
>
> There is strong agreement on two key points:
>
>
>
> 1)Modern networks require much faster flooding speeds than are commonly i=
n
> use today
>
>
>
> 2)To deploy faster flooding speeds safely some form of flow control is
> needed
>
>
>
> The key point of contention between the two drafts is how flow control
> should be implemented.
>
>
>
> https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/
> advocates for a receiver based flow control where the receiver advertises
> in hellos the parameters which indicate the rate/burst size which the
> receiver is capable of supporting on the interface. Senders are required =
to
> limit the rate of LSP transmission on that interface in accordance with t=
he
> values advertised by the receiver.
>
>
>
> https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/
>  advocates for a transmit based flow control where the transmitter monito=
rs
> the number of unacknowledged LSPs sent on each interface and implements a
> backoff algorithm to slow the rate of sending LSPs based on the length of
> the per interface unacknowledged queue.
>
>
>
> While other differences between the two drafts exist, it is fair to say
> that if agreement could be reached on the form of flow control  then it i=
s
> likely other issues could be resolved easily.
>
>
>
> This email starts the discussion regarding the flow control issue.
>
>
>
>
>
> _________________________________________________________________________=
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>
>
>
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>
> a l'expediteur et le detruire ainsi que les pieces jointes. Les messages =
electroniques etant susceptibles d'alteration,
>
> Orange decline toute responsabilite si ce message a ete altere, deforme o=
u falsifie. Merci.
>
>
>
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> they should not be distributed, used or copied without authorisation.
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>
> Thank you.
>
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> Lsr mailing list
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> https://www.ietf.org/mailman/listinfo/lsr
>

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<div dir=3D"ltr"><div>neither am I aware of anything like this (i.e. per pl=
atform/product flooding rate constants) in any major vendor stack for whate=
ver that&#39;s worth. It&#39;s simply unmaintanable, point. All major vendo=
rs have extensive product lines over so many changing hardware configuratio=
n/setups it is simply not viable to attempt precise measurements (and even =
then, user changing config can throw the stuff off in a millisecond). There=
 may have been here and there per deployment scenario some &quot;recommende=
d config&quot; (not something I immediately recall either) but that means v=
ery fixed configuration of things &amp; how they go into networks and even =
then I&#39;m not aware of anyone having had a &quot;precise model of the ch=
ain in the box&quot;. yes, probes to measure lots and lots of stuff in the =
boxes exist but again, those are chip/linecard/backplane/chassis/routing en=
gine specific and mostly used in complex test/peformance scenarios and not =
to derive some kind of equations that can predict anything much ... <br></d=
iv><div><br></div><div>Bruno, if you&#39;re so deeply interested in that st=
uff we can talk 1:1 off-line about implementation work on rift towards adap=
atable flooding rate (algorithm you see in the -02 draft Les put out is a _=
very rough_ approximation of that BTW. I joined as co-author after we had s=
ome very fruitful discussions and I consider the draft close to what can be=
 _realistically_ done=C2=A0 today in ISIS. I don&#39;t consider further det=
ails generic enough to merit wide forum discussions). And RIFT put a couple=
 of things into packet formats we can&#39;t put into ISIS (I talked with Le=
s about it) to improve the adaptability of the flooding rate BTW and some i=
nteresting, coarse indication from receiver. Again, this is not a constant =
that is calculated, it&#39;s all adaptive driven almost completely from the=
 transmitter side and the feedback it gathers. <br></div><div><br></div><di=
v>all my very own 2c<br></div><div><br></div><div>-- tony <br></div></div><=
br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Tue,=
 Apr 21, 2020 at 2:48 PM Les Ginsberg (ginsberg) &lt;ginsberg=3D<a href=3D"=
mailto:40cisco.com@dmarc.ietf.org">40cisco.com@dmarc.ietf.org</a>&gt; wrote=
:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.=
8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">





<div lang=3D"EN-US">
<div>
<p class=3D"MsoNormal">Bruno =E2=80=93<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">You have made an assumption that historically vendor=
s have tuned LSP transmission rates to a platform specific value.<u></u><u>=
</u></p>
<p class=3D"MsoNormal">That certainly is not true in the case of my employe=
r (happy to hear what other vendors have been doing for the past 20 years).=
<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">The default value is based on minimumBroadcastLSPTra=
nsmissionInterval specified in ISO10589.<u></u><u></u></p>
<p class=3D"MsoNormal">A knob is available to allow tuning (faster or slowe=
r) in a given deployment =E2=80=93 though in my experience this knob is rar=
ely used.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">We already discuss in <a href=3D"https://tools.ietf.=
org/html/draft-ginsberg-lsr-isis-flooding-scale-02#section-2" target=3D"_bl=
ank">
https://tools.ietf.org/html/draft-ginsberg-lsr-isis-flooding-scale-02#secti=
on-2</a> that this common interpretation isn=E2=80=99t the most appropriate=
, but historically the concern has been to avoid flooding too fast =E2=80=
=93 not to optimize flooding speed.<u></u><u></u></p>
<p class=3D"MsoNormal">Obviously, we are revisiting that approach and sayin=
g it needs to change =E2=80=93 which is something I think we have consensus=
 on.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">I have provided a description in my recent response =
as to why it is difficult to derive an optimal value on a per platform basi=
s. You may disagree =E2=80=93 but please do not claim that we actually have=
 been doing this for years. We haven=E2=80=99t been.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">=C2=A0 Les<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div style=3D"border-color:currentcolor currentcolor currentcolor blue;bord=
er-style:none none none solid;border-width:medium medium medium 1.5pt;paddi=
ng:0in 0in 0in 4pt">
<div>
<div style=3D"border-color:rgb(225,225,225) currentcolor currentcolor;borde=
r-style:solid none none;border-width:1pt medium medium;padding:3pt 0in 0in"=
>
<p class=3D"MsoNormal"><b>From:</b> <a href=3D"mailto:bruno.decraene@orange=
.com" target=3D"_blank">bruno.decraene@orange.com</a> &lt;<a href=3D"mailto=
:bruno.decraene@orange.com" target=3D"_blank">bruno.decraene@orange.com</a>=
&gt;
<br>
<b>Sent:</b> Monday, April 20, 2020 4:47 AM<br>
<b>To:</b> Les Ginsberg (ginsberg) &lt;<a href=3D"mailto:ginsberg@cisco.com=
" target=3D"_blank">ginsberg@cisco.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</=
a><br>
<b>Subject:</b> RE: Flow Control Discussion for IS-IS Flooding Speed<u></u>=
<u></u></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125)">Les,<u></u><u><=
/u></span></p>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125)"><u></u>=C2=A0<u=
></u></span></p>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125)">After nearly 2 =
months, can we expect an answer from your side?<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125)"><u></u>=C2=A0<u=
></u></span></p>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125)">More specifical=
ly, the below question<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125)"><u></u>=C2=A0<u=
></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">[Bruno] _Assuming_ that the parameters are static, the param=
eters proposed in draft-decraene-lsr-isis-flooding-speed are the same as th=
e one implemented (configured) on multiple implementations,
 including the one from your employer.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">Now do you believe that those parameters can be determined?<=
u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A7=C2=A0 If yes, how do you do _today_ on your implement=
ation? (this seems to contradict your statement that you have no way to fig=
ure out how to find the right value)<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;">=C2=A7=C2=A0 If no, why did you implement those parameters, =
and ask network operator to configure them?<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125)"><u></u>=C2=A0<u=
></u></span></p>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125)"><u></u>=C2=A0<u=
></u></span></p>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125)">Thank you,<u></=
u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125)">--Bruno<u></u><=
u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"color:rgb(31,73,125)"><u></u>=C2=A0<u=
></u></span></p>
<div>
<div style=3D"border-color:rgb(181,196,223) currentcolor currentcolor;borde=
r-style:solid none none;border-width:1pt medium medium;padding:3pt 0in 0in"=
>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><b><span style=3D"font-=
size:10pt;font-family:&quot;Tahoma&quot;,sans-serif" lang=3D"FR">From:</spa=
n></b><span style=3D"font-size:10pt;font-family:&quot;Tahoma&quot;,sans-ser=
if" lang=3D"FR"> DECRAENE Bruno TGI/OLN
<br>
<b>Sent:</b> Wednesday, February 26, 2020 8:03 PM<br>
<b>To:</b> &#39;Les Ginsberg (ginsberg)&#39;<br>
<b>Cc:</b> <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</=
a><br>
<b>Subject:</b> RE: Flow Control Discussion for IS-IS Flooding Speed<u></u>=
<u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"FR"><u></=
u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"color:rg=
b(31,73,125)" lang=3D"FR">Les,<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"color:rg=
b(31,73,125)" lang=3D"FR"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"color:rg=
b(31,73,125)" lang=3D"FR">Please see inline[Bruno]<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"color:rg=
b(31,73,125)" lang=3D"FR"><u></u>=C2=A0<u></u></span></p>
<div>
<div style=3D"border-color:rgb(181,196,223) currentcolor currentcolor;borde=
r-style:solid none none;border-width:1pt medium medium;padding:3pt 0in 0in"=
>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><b><span style=3D"font-=
size:10pt;font-family:&quot;Tahoma&quot;,sans-serif" lang=3D"FR">From:</spa=
n></b><span style=3D"font-size:10pt;font-family:&quot;Tahoma&quot;,sans-ser=
if" lang=3D"FR"> Lsr [<a href=3D"mailto:lsr-bounces@ietf.org" target=3D"_bl=
ank">mailto:lsr-bounces@ietf.org</a>]
<b>On Behalf Of </b>Les Ginsberg (ginsberg)<br>
<b>Sent:</b> Wednesday, February 19, 2020 3:32 AM<br>
<b>To:</b> <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</=
a><br>
<b>Subject:</b> Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed<=
u></u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"FR"><u></=
u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">Base protocol operation=
 of the Update process tracks the flooding of<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">LSPs/interface and guar=
antees timer-based retransmission on P2P interfaces<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">until an acknowledgment=
 is received.<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">Using this base protoco=
l mechanism in combination with exponential backoff of the<u></u><u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">retransmission timer pr=
ovides flow control in the event of temporary overload<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">of the receiver. <u></u=
><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">=C2=A0<u></u><u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">This mechanism works wi=
thout protocol extensions, is dynamic, operates<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">independent of the reas=
on for delayed acknowledgment (dropped packets, CPU<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">overload), and does not=
 require additional signaling during the overloaded<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">period.<u></u><u></u></=
p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">This is consistent with=
 the recommendations in RFC 4222 (OSPF).<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">Receiver-based flow con=
trol (as proposed in
<a href=3D"https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-floodin=
g-speed/" target=3D"_blank">
https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/</a=
> )<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">requires protocol exten=
sions and introduces additional signaling during<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">periods of high load. T=
he asserted reason for this is to optimize throughput -<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">but there is no evidenc=
e that it will achieve this goal.<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">Mention has been made t=
o TCP-like flow control mechanisms as a model - which<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">are indeed receiver bas=
ed. However, there are significant differences between<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">TCP sessions and IGP fl=
ooding.<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">TCP consists of a singl=
e session between two endpoints. Resources<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">(primarily buffer space=
) for this session are typically allocated in the<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">control plane and curre=
nt usage is easily measurable..<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">IGP flooding is point-t=
o-multi-point, resources to support IGP flooding<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">involve both control pl=
ane queues and dataplane queues, both of which are<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">typically not per inter=
face - nor even dedicated to a particular protocol<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">instance. What input is=
 required to optimize receiver-based flow control is not fully specified.<u=
></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><a href=3D"https://data=
tracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/" target=3D"_bl=
ank">https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-spee=
d/</a> suggests (Section 5) that the values<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">to be advertised:<u></u=
><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">&quot;use a formula bas=
ed on an off line tests of<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">=C2=A0=C2=A0 the overal=
l LSPDU processing speed for a particular set of hardware<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">=C2=A0=C2=A0 and the nu=
mber of interfaces configured for IS-IS&quot;<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">implying that the adver=
tised value is intentionally not dynamic. As such,<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">it could just as easily=
 be configured on the transmit side and not require<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">additional signaling. A=
s a static value, it would necessarily be somewhat<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">conservative as it has =
to account for the worst case under the current<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">configuration - which m=
eans it needs to consider concurrent use of the CPU<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">and dataplane by all pr=
otocols/features which are enabled on a router - not all of whose<u></u><u>=
</u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">use is likely to be syn=
chronized with peak IS-IS flooding load.<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"color:rg=
b(31,73,125)">[Bruno] _<i>Assuming</i>_ that the parameters are static, tho=
se parameters
<u></u><u></u></span></p>
<p style=3D"margin-left:107.4pt">
<u></u><span style=3D"font-family:&quot;Courier New&quot;;color:rgb(31,73,1=
25)"><span>o<span style=3D"font:7pt &quot;Times New Roman&quot;">=C2=A0=C2=
=A0
</span></span></span><u></u><span style=3D"color:rgb(31,73,125)">are the sa=
me as the one implemented (configured) on multiple implementations, includi=
ng the one from your employer. Now do you believe that those parameters can=
 be determined?<u></u><u></u></span></p>
<p style=3D"margin-left:143.4pt">
<u></u><span style=3D"font-family:Wingdings;color:rgb(31,73,125)"><span>=C2=
=A7<span style=3D"font:7pt &quot;Times New Roman&quot;">=C2=A0
</span></span></span><u></u><span style=3D"color:rgb(31,73,125)">If yes, ho=
w do you do _<i>today</i>_ on your implementation? (this seems to contradic=
t your statement that you have no way to figure out how to find the right v=
alue)<u></u><u></u></span></p>
<p style=3D"margin-left:143.4pt">
<u></u><span style=3D"font-family:Wingdings;color:rgb(31,73,125)"><span>=C2=
=A7<span style=3D"font:7pt &quot;Times New Roman&quot;">=C2=A0
</span></span></span><u></u><span style=3D"color:rgb(31,73,125)">If no, why=
 did you implement those parameters, and ask network operator to configure =
them?<u></u><u></u></span></p>
<p style=3D"margin-left:143.4pt">
<u></u><span style=3D"font-family:Wingdings;color:rgb(31,73,125)"><span>=C2=
=A7<span style=3D"font:7pt &quot;Times New Roman&quot;">=C2=A0
</span></span></span><u></u><span style=3D"color:rgb(31,73,125)">There is a=
lso the option to reply: I don=E2=80=99t know but don=E2=80=99t care as I l=
eave the issue to the network operator.<u></u><u></u></span></p>
<p style=3D"margin-left:107.4pt">
<u></u><span style=3D"font-family:&quot;Courier New&quot;;color:rgb(31,73,1=
25)"><span>o<span style=3D"font:7pt &quot;Times New Roman&quot;">=C2=A0=C2=
=A0
</span></span></span><u></u><span style=3D"color:rgb(31,73,125)">can still =
provide some form of dynamicity, by using the PSNP as dynamic acknowledgeme=
nt.
<u></u><u></u></span></p>
<p style=3D"margin-left:107.4pt">
<u></u><span style=3D"font-family:&quot;Courier New&quot;;color:rgb(31,73,1=
25)"><span>o<span style=3D"font:7pt &quot;Times New Roman&quot;">=C2=A0=C2=
=A0
</span></span></span><u></u><span style=3D"color:rgb(31,73,125)">are really=
 dependent on the receiver, not the sender.<u></u><u></u></span></p>
<p style=3D"margin-left:143.4pt">
<u></u><span style=3D"font-family:Wingdings;color:rgb(31,73,125)"><span>=C2=
=A7<span style=3D"font:7pt &quot;Times New Roman&quot;">=C2=A0
</span></span></span><u></u><span style=3D"color:rgb(31,73,125)">the sender=
 will never overload itself.
<u></u><u></u></span></p>
<p style=3D"margin-left:143.4pt">
<u></u><span style=3D"font-family:Wingdings;color:rgb(31,73,125)"><span>=C2=
=A7<span style=3D"font:7pt &quot;Times New Roman&quot;">=C2=A0
</span></span></span><u></u><span style=3D"color:rgb(31,73,125)">The receiv=
er has more information,=C2=A0 knowing its processing power (low end, high =
end, 80s, 20s (currently we are stuck with 20 years old value assuming the =
worst possible receiver (and worst there were,
 including with packet processing partly done in the control plane processo=
r)), its expected IS-IS load (#neighbors), its preference for bursty LSP re=
ception (high delay between IS-IS CPU allocation cycles, memory not an issu=
e up to x kilo-octet=E2=80=A6), its expected
 control plane load if IS-IS traffic has not higher priority over other con=
trol plane traffic=E2=80=A6), it=E2=80=99s expected level of QoS prioritiza=
tion [1]<u></u><u></u></span></p>
<p style=3D"margin-left:179.4pt">
<u></u><span style=3D"font-family:Symbol;color:rgb(31,73,125)"><span>=C2=B7=
<span style=3D"font:7pt &quot;Times New Roman&quot;">=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span style=3D"color:rgb(31,73,125)">=C2=A0[1] =
looks for =E2=80=9CExtended SPD Headroom=E2=80=9D. E.g. =E2=80=9C</span>Sin=
ce IGP and link stability are more tenuous and more crucial than BGP stabil=
ity, such packets are now given the highest priority and are given
 extended SPD headroom with a default of 10 packets. This means that these =
packets are not dropped if the size of the input hold queue is lower than 1=
85 (input queue default size + spd headroom size + spd extended headroom).=
=E2=80=9D<span style=3D"color:rgb(31,73,125)"><u></u><u></u></span></p>
<p style=3D"margin-left:215.4pt">
<u></u><span style=3D"font-family:&quot;Courier New&quot;;color:rgb(31,73,1=
25)"><span>o<span style=3D"font:7pt &quot;Times New Roman&quot;">=C2=A0=C2=
=A0
</span></span></span><u></u><span style=3D"color:rgb(31,73,125)">And this i=
s for distributed architecture, 15 years ago. So what about using the above=
 number (in the router configuration), applies Tony=E2=80=99s proposal (*ov=
ersubscription/number of IS neighbhors), and advertise
 this value to your LSP sender?<u></u><u></u></span></p>
<p style=3D"margin-left:71.4pt"><span style=3D"color:rgb(31,73,125)"><u></u=
>=C2=A0<u></u></span></p>
<p style=3D"margin-left:177pt"><span style=3D"color:rgb(31,73,125)">[1]
<a href=3D"https://www.cisco.com/c/en/us/support/docs/routers/12000-series-=
routers/29920-spd.html" target=3D"_blank">
https://www.cisco.com/c/en/us/support/docs/routers/12000-series-routers/299=
20-spd.html</a>
<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"color:rg=
b(31,73,125)"><u></u>=C2=A0<u></u></span></p>
<p style=3D"margin-left:71.4pt">
<u></u><span style=3D"color:rgb(31,73,125)"><span>-<span style=3D"font:7pt =
&quot;Times New Roman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0
</span></span></span><u></u><span style=3D"color:rgb(31,73,125)"><u></u>=C2=
=A0<u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span style=3D"color:rg=
b(31,73,125)">--Bruno<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span style=3D"color:rg=
b(31,73,125)"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span style=3D"color:rg=
b(31,73,125)"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">Unless a good case can =
be made as to why transmit-based flow control is not a good<u></u><u></u></=
p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">fit and why receiver-ba=
sed flow control is demonstrably better, it seems<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">unnecessary to extend t=
he protocol.<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">=C2=A0=C2=A0=C2=A0 Les<=
u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><u></u>=C2=A0<u></u></p=
>
<div style=3D"border-color:currentcolor currentcolor currentcolor blue;bord=
er-style:none none none solid;border-width:medium medium medium 1.5pt;paddi=
ng:0in 0in 0in 4pt">
<div>
<div style=3D"border-color:rgb(225,225,225) currentcolor currentcolor;borde=
r-style:solid none none;border-width:1pt medium medium;padding:3pt 0in 0in"=
>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><b>From:</b> Lsr &lt;<a=
 href=3D"mailto:lsr-bounces@ietf.org" target=3D"_blank">lsr-bounces@ietf.or=
g</a>&gt;
<b>On Behalf Of </b>Les Ginsberg (ginsberg)<br>
<b>Sent:</b> Tuesday, February 18, 2020 6:25 PM<br>
<b>To:</b> <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</=
a><br>
<b>Subject:</b> [Lsr] Flow Control Discussion for IS-IS Flooding Speed<u></=
u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">Two recent drafts advoc=
ate for the use of faster LSP flooding speeds in IS-IS:<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><a href=3D"https://data=
tracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/" target=3D"_bl=
ank">https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-spee=
d/</a><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><a href=3D"https://data=
tracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/" target=3D"_bl=
ank">https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scal=
e/</a><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">There is strong agreeme=
nt on two key points:<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">1)Modern networks requi=
re much faster flooding speeds than are commonly in use today<u></u><u></u>=
</p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">2)To deploy faster floo=
ding speeds safely some form of flow control is needed<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">The key point of conten=
tion between the two drafts is how flow control should be implemented.<u></=
u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><a href=3D"https://data=
tracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/" target=3D"_bl=
ank">https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-spee=
d/</a> advocates for a receiver based flow control where
 the receiver advertises in hellos the parameters which indicate the rate/b=
urst size which the receiver is capable of supporting on the interface. Sen=
ders are required to limit the rate of LSP transmission on that interface i=
n accordance with the values advertised
 by the receiver.<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><a href=3D"https://data=
tracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/" target=3D"_bl=
ank">https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scal=
e/</a> =C2=A0advocates for a transmit based flow control where
 the transmitter monitors the number of unacknowledged LSPs sent on each in=
terface and implements a backoff algorithm to slow the rate of sending LSPs=
 based on the length of the per interface unacknowledged queue.<u></u><u></=
u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">While other differences=
 between the two drafts exist, it is fair to say that if agreement could be=
 reached on the form of flow control=C2=A0 then it is likely other issues c=
ould be resolved easily.<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">This email starts the d=
iscussion regarding the flow control issue.
<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><u></u>=C2=A0<u></u></p=
>
<p style=3D"margin-left:70.8pt"><u></u>=C2=A0<u></u></p>
</div>
<pre><span lang=3D"FR">____________________________________________________=
_____________________________________________________________________<u></u=
><u></u></span></pre>
<pre><span lang=3D"FR"><u></u>=C2=A0<u></u></span></pre>
<pre><span lang=3D"FR">Ce message et ses pieces jointes peuvent contenir de=
s informations confidentielles ou privilegiees et ne doivent donc<u></u><u>=
</u></span></pre>
<pre><span lang=3D"FR">pas etre diffuses, exploites ou copies sans autorisa=
tion. Si vous avez recu ce message par erreur, veuillez le signaler<u></u><=
u></u></span></pre>
<pre><span lang=3D"FR">a l&#39;expediteur et le detruire ainsi que les piec=
es jointes. Les messages electroniques etant susceptibles d&#39;alteration,=
<u></u><u></u></span></pre>
<pre><span lang=3D"FR">Orange decline toute responsabilite si ce message a =
ete altere, deforme ou falsifie. Merci.<u></u><u></u></span></pre>
<pre><span lang=3D"FR"><u></u>=C2=A0<u></u></span></pre>
<pre><span lang=3D"FR">This message and its attachments may contain confide=
ntial or privileged information that may be protected by law;<u></u><u></u>=
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<pre><span lang=3D"FR">they should not be distributed, used or copied witho=
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<pre><span lang=3D"FR">Thank you.<u></u><u></u></span></pre>
</div>
</div>
</div>

_______________________________________________<br>
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Derek Yeung <derek@arrcus.com>, Peter Psenak <ppsenak=40cisco.com@dmarc.ietf.org>, Chris Bowers <chrisbowers.ietf@gmail.com>
CC: "lsr@ietf.org" <lsr@ietf.org>, SPRING WG List <spring@ietf.org>, "Ketan Talaulikar (ketant)" <ketant@cisco.com>, Bruno Decraene <bruno.decraene@orange.com>
Thread-Topic: [Lsr] clarification of locator block and locator node in draft-ietf-spring-srv6-network-programming and draft-ietf-lsr-isis-srv6-extensions
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Subject: Re: [Lsr] clarification of locator block and locator node in draft-ietf-spring-srv6-network-programming and draft-ietf-lsr-isis-srv6-extensions
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To: Tony Przygienda <tonysietf@gmail.com>
CC: "lsr@ietf.org" <lsr@ietf.org>, "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>
Thread-Topic: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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From: <bruno.decraene@orange.com>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
CC: "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: Flow Control Discussion for IS-IS Flooding Speed
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Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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Les,

Please see inline

From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]
Sent: Tuesday, April 21, 2020 11:48 PM
To: DECRAENE Bruno TGI/OLN
Cc: lsr@ietf.org
Subject: RE: Flow Control Discussion for IS-IS Flooding Speed

Bruno -

You have made an assumption that historically vendors have tuned LSP transm=
ission rates to a platform specific value.
[Bruno] I don't think so. What makes you think so?
In all cases, that is not my assumption, and for multiple reasons.

That certainly is not true in the case of my employer (happy to hear what o=
ther vendors have been doing for the past 20 years).

The default value is based on minimumBroadcastLSPTransmissionInterval speci=
fied in ISO10589.
A knob is available to allow tuning (faster or slower) in a given deploymen=
t - though in my experience this knob is rarely used.
[Bruno] I would agree on both. More interestingly is the why: why aren't th=
ose existing sending parameters tuned, while we  agree that default configu=
ration are suboptimal?
My take is that:

-          We don't want to overload the receiver and create loss of LSP (a=
s this will delay the LSDB synchronization and decrease the goodput). Hence=
 this (the parameters) is receiver dependent (e.g., platform type,  number =
of IGP adjacencies, ...).

-          We don't know which value to configure : difficult for the netwo=
rk operator to evaluate without a significant knowledge of the receiver imp=
lementation (in particular QoS parameters for incoming LSP), vendors are no=
t really proposing value or guidance, especially since the sending behavior=
 is not standardized and slightly different between vendors. So everyone st=
ay safe with default 20 years old values.

We already discuss in https://tools.ietf.org/html/draft-ginsberg-lsr-isis-f=
looding-scale-02#section-2 that this common interpretation isn't the most a=
ppropriate, but historically the concern has been to avoid flooding too fas=
t - not to optimize flooding speed.
Obviously, we are revisiting that approach and saying it needs to change - =
which is something I think we have consensus on.

I have provided a description in my recent response as to why it is difficu=
lt to derive an optimal value on a per platform basis. You may disagree - b=
ut please do not claim that we actually have been doing this for years. We =
haven't been.
[Bruno] I'm not sure how to rephrase my below email so that we could unders=
tand each other, have an answer from your side (I mean employer side), and =
progress.
More succinctly: How do network operator correctly configure the flooding p=
arameters value on the implementation of your employer? In particular given=
 the variety of conditions on the LSP receiver side.

--Bruno

  Les

From: bruno.decraene@orange.com <bruno.decraene@orange.com>
Sent: Monday, April 20, 2020 4:47 AM
To: Les Ginsberg (ginsberg) <ginsberg@cisco.com>
Cc: lsr@ietf.org
Subject: RE: Flow Control Discussion for IS-IS Flooding Speed

Les,

After nearly 2 months, can we expect an answer from your side?

More specifically, the below question

[Bruno] _Assuming_ that the parameters are static, the parameters proposed =
in draft-decraene-lsr-isis-flooding-speed are the same as the one implement=
ed (configured) on multiple implementations, including the one from your em=
ployer.
Now do you believe that those parameters can be determined?

=A7  If yes, how do you do _today_ on your implementation? (this seems to c=
ontradict your statement that you have no way to figure out how to find the=
 right value)

=A7  If no, why did you implement those parameters, and ask network operato=
r to configure them?


Thank you,
--Bruno

From: DECRAENE Bruno TGI/OLN
Sent: Wednesday, February 26, 2020 8:03 PM
To: 'Les Ginsberg (ginsberg)'
Cc: lsr@ietf.org<mailto:lsr@ietf.org>
Subject: RE: Flow Control Discussion for IS-IS Flooding Speed

Les,

Please see inline[Bruno]

From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Les Ginsberg (ginsberg)
Sent: Wednesday, February 19, 2020 3:32 AM
To: lsr@ietf.org<mailto:lsr@ietf.org>
Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed

Base protocol operation of the Update process tracks the flooding of
LSPs/interface and guarantees timer-based retransmission on P2P interfaces
until an acknowledgment is received.

Using this base protocol mechanism in combination with exponential backoff =
of the
retransmission timer provides flow control in the event of temporary overlo=
ad
of the receiver.

This mechanism works without protocol extensions, is dynamic, operates
independent of the reason for delayed acknowledgment (dropped packets, CPU
overload), and does not require additional signaling during the overloaded
period.

This is consistent with the recommendations in RFC 4222 (OSPF).

Receiver-based flow control (as proposed in https://datatracker.ietf.org/do=
c/draft-decraene-lsr-isis-flooding-speed/ )
requires protocol extensions and introduces additional signaling during
periods of high load. The asserted reason for this is to optimize throughpu=
t -
but there is no evidence that it will achieve this goal.

Mention has been made to TCP-like flow control mechanisms as a model - which
are indeed receiver based. However, there are significant differences betwe=
en
TCP sessions and IGP flooding.

TCP consists of a single session between two endpoints. Resources
(primarily buffer space) for this session are typically allocated in the
control plane and current usage is easily measurable..

IGP flooding is point-to-multi-point, resources to support IGP flooding
involve both control plane queues and dataplane queues, both of which are
typically not per interface - nor even dedicated to a particular protocol
instance. What input is required to optimize receiver-based flow control is=
 not fully specified.

https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/ su=
ggests (Section 5) that the values
to be advertised:

"use a formula based on an off line tests of
   the overall LSPDU processing speed for a particular set of hardware
   and the number of interfaces configured for IS-IS"

implying that the advertised value is intentionally not dynamic. As such,
it could just as easily be configured on the transmit side and not require
additional signaling. As a static value, it would necessarily be somewhat
conservative as it has to account for the worst case under the current
configuration - which means it needs to consider concurrent use of the CPU
and dataplane by all protocols/features which are enabled on a router - not=
 all of whose
use is likely to be synchronized with peak IS-IS flooding load.
[Bruno] _Assuming_ that the parameters are static, those parameters

o   are the same as the one implemented (configured) on multiple implementa=
tions, including the one from your employer. Now do you believe that those =
parameters can be determined?

*  If yes, how do you do _today_ on your implementation? (this seems to con=
tradict your statement that you have no way to figure out how to find the r=
ight value)

*  If no, why did you implement those parameters, and ask network operator =
to configure them?

*  There is also the option to reply: I don't know but don't care as I leav=
e the issue to the network operator.

o   can still provide some form of dynamicity, by using the PSNP as dynamic=
 acknowledgement.

o   are really dependent on the receiver, not the sender.

*  the sender will never overload itself.

*  The receiver has more information,  knowing its processing power (low en=
d, high end, 80s, 20s (currently we are stuck with 20 years old value assum=
ing the worst possible receiver (and worst there were, including with packe=
t processing partly done in the control plane processor)), its expected IS-=
IS load (#neighbors), its preference for bursty LSP reception (high delay b=
etween IS-IS CPU allocation cycles, memory not an issue up to x kilo-octet.=
..), its expected control plane load if IS-IS traffic has not higher priori=
ty over other control plane traffic...), it's expected level of QoS priorit=
ization [1]

*          [1] looks for "Extended SPD Headroom". E.g. "Since IGP and link =
stability are more tenuous and more crucial than BGP stability, such packet=
s are now given the highest priority and are given extended SPD headroom wi=
th a default of 10 packets. This means that these packets are not dropped i=
f the size of the input hold queue is lower than 185 (input queue default s=
ize + spd headroom size + spd extended headroom)."

o   And this is for distributed architecture, 15 years ago. So what about u=
sing the above number (in the router configuration), applies Tony's proposa=
l (*oversubscription/number of IS neighbhors), and advertise this value to =
your LSP sender?



[1] https://www.cisco.com/c/en/us/support/docs/routers/12000-series-routers=
/29920-spd.html


-
--Bruno


Unless a good case can be made as to why transmit-based flow control is not=
 a good
fit and why receiver-based flow control is demonstrably better, it seems
unnecessary to extend the protocol.

    Les


From: Lsr <lsr-bounces@ietf.org<mailto:lsr-bounces@ietf.org>> On Behalf Of =
Les Ginsberg (ginsberg)
Sent: Tuesday, February 18, 2020 6:25 PM
To: lsr@ietf.org<mailto:lsr@ietf.org>
Subject: [Lsr] Flow Control Discussion for IS-IS Flooding Speed

Two recent drafts advocate for the use of faster LSP flooding speeds in IS-=
IS:

https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/
https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/

There is strong agreement on two key points:

1)Modern networks require much faster flooding speeds than are commonly in =
use today

2)To deploy faster flooding speeds safely some form of flow control is need=
ed

The key point of contention between the two drafts is how flow control shou=
ld be implemented.

https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/ ad=
vocates for a receiver based flow control where the receiver advertises in =
hellos the parameters which indicate the rate/burst size which the receiver=
 is capable of supporting on the interface. Senders are required to limit t=
he rate of LSP transmission on that interface in accordance with the values=
 advertised by the receiver.

https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/  a=
dvocates for a transmit based flow control where the transmitter monitors t=
he number of unacknowledged LSPs sent on each interface and implements a ba=
ckoff algorithm to slow the rate of sending LSPs based on the length of the=
 per interface unacknowledged queue.

While other differences between the two drafts exist, it is fair to say tha=
t if agreement could be reached on the form of flow control  then it is lik=
ely other issues could be resolved easily.

This email starts the discussion regarding the flow control issue.




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<body lang=3D"FR" link=3D"blue" vlink=3D"purple" style=3D"tab-interval:35.4=
pt">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"mso-ascii-font-family:Calibri;mso-han=
si-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;col=
or:#1F497D">Les,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-ascii-font-family:Calibri;mso-han=
si-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;col=
or:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span class=3D"SpellE"><span style=3D"mso-ascii-font=
-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Ti=
mes New Roman&quot;;color:#1F497D">Please</span></span><span style=3D"mso-a=
scii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family=
:&quot;Times New Roman&quot;;color:#1F497D">
<span class=3D"SpellE">see</span> <span class=3D"SpellE">inline</span> <o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"mso-ascii-font-family:Calibri;mso-han=
si-font-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;col=
or:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><b><span style=3D"font-=
size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;mso-farea=
st-font-family:&quot;Times New Roman&quot;">From:</span></b><span style=3D"=
font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;;mso-=
fareast-font-family:&quot;Times New Roman&quot;">
 Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com] <br>
<b>Sent:</b> Tuesday, April 21, 2020 11:48 PM<br>
<b>To:</b> DECRAENE Bruno TGI/OLN<br>
<b>Cc:</b> lsr@ietf.org<br>
<b>Subject:</b> RE: Flow Control Discussion for IS-IS Flooding Speed<o:p></=
o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">Bruno &#8211;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">You have made an assumption that historical=
ly vendors have tuned LSP transmission rates to a platform specific value.<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New =
Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">[Bruno] I don&#8217;t th=
ink so. What makes you think so?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New =
Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">In all cases, that is no=
t my assumption, and for multiple reasons.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New =
Roman&quot;;color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">That certainly is not true in the case of m=
y employer (happy to hear what other vendors have been doing for the past 2=
0 years).<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">The default value is based on minimumBroadc=
astLSPTransmissionInterval specified in ISO10589.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">A knob is available to allow tuning (faster=
 or slower) in a given deployment &#8211; though in my experience this knob=
 is rarely used.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b style=3D"mso-bidi-font-weight:normal"><i style=3D=
"mso-bidi-font-style:normal"><span lang=3D"EN-US" style=3D"mso-ascii-font-f=
amily:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Time=
s New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US"></span></i></b><sp=
an lang=3D"EN-US" style=3D"mso-ascii-font-family:Calibri;mso-hansi-font-fam=
ily:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;color:#1F497D;=
mso-ansi-language:EN-US">[Bruno]
 I would agree on both. More interestingly is the why: why aren&#8217;t tho=
se existing sending parameters tuned, while we
<span style=3D"mso-spacerun:yes">&nbsp;</span>agree that default configurat=
ion are suboptimal?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New =
Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">My take is that:<o:p></o=
:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l1 leve=
l1 lfo2"><![if !supportLists]><span lang=3D"EN-US" style=3D"mso-fareast-fon=
t-family:Calibri;color:#1F497D;mso-ansi-language:EN-US"><span style=3D"mso-=
list:Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"mso-ascii-font=
-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Ti=
mes New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">We don&#8217;t w=
ant to overload the receiver and create loss of LSP
 (as this will delay the LSDB synchronization and decrease the <span class=
=3D"SpellE">
goodput</span>). Hence this (the parameters) is receiver dependent (e.g., p=
latform type,
<span style=3D"mso-spacerun:yes">&nbsp;</span>number of IGP adjacencies, &#=
8230;).<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l1 leve=
l1 lfo2"><![if !supportLists]><span lang=3D"EN-US" style=3D"mso-fareast-fon=
t-family:Calibri;color:#1F497D;mso-ansi-language:EN-US"><span style=3D"mso-=
list:Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"mso-ascii-font=
-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Ti=
mes New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">We don&#8217;t k=
now which value to configure : difficult for the network
 operator to evaluate without a significant knowledge of the receiver imple=
mentation (in particular
<span class=3D"SpellE">QoS</span> parameters for incoming LSP), vendors are=
 not really proposing value or guidance, especially since the sending behav=
ior is not standardized and slightly different between vendors. So everyone=
 stay safe with default 20 years old
 values.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New =
Roman&quot;;color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">We already discuss in
<a href=3D"https://tools.ietf.org/html/draft-ginsberg-lsr-isis-flooding-sca=
le-02#section-2">
https://tools.ietf.org/html/draft-ginsberg-lsr-isis-flooding-scale-02#secti=
on-2</a> that this common interpretation isn&#8217;t the most appropriate, =
but historically the concern has been to avoid flooding too fast &#8211; no=
t to optimize flooding speed.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">Obviously, we are revisiting that approach =
and saying it needs to change &#8211; which is something I think we have co=
nsensus on.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">I have provided a description in my recent =
response as to why it is difficult to derive an optimal value on a per plat=
form basis. You may disagree &#8211; but please
 do not claim that we actually have been doing this for years. We haven&#82=
17;t been.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b style=3D"mso-bidi-font-weight:normal"><i style=3D=
"mso-bidi-font-style:normal"><span lang=3D"EN-US" style=3D"mso-ascii-font-f=
amily:Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Time=
s New Roman&quot;;color:#1F497D;mso-ansi-language:EN-US"></span></i></b><sp=
an lang=3D"EN-US" style=3D"mso-ascii-font-family:Calibri;mso-hansi-font-fam=
ily:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;color:#1F497D;=
mso-ansi-language:EN-US">[Bruno]
 I&#8217;m not sure how to rephrase my below email so that we could underst=
and each other, have an answer from your side (I mean employer side), and p=
rogress.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New =
Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">More succinctly: How do =
network operator correctly configure the flooding
 parameters value on the implementation of your employer? In particular giv=
en the variety of conditions on the LSP receiver side.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New =
Roman&quot;;color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ascii-font-family:=
Calibri;mso-hansi-font-family:Calibri;mso-bidi-font-family:&quot;Times New =
Roman&quot;;color:#1F497D;mso-ansi-language:EN-US">--Bruno<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US">&nbsp; Les<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><b><span lang=3D"EN-US"=
 style=3D"mso-ansi-language:EN-US">From:</span></b><span lang=3D"EN-US" sty=
le=3D"mso-ansi-language:EN-US"> bruno.decraene@orange.com &lt;bruno.decraen=
e@orange.com&gt;
<br>
<b>Sent:</b> Monday, April 20, 2020 4:47 AM<br>
<b>To:</b> Les Ginsberg (ginsberg) &lt;ginsberg@cisco.com&gt;<br>
<b>Cc:</b> lsr@ietf.org<br>
<b>Subject:</b> RE: Flow Control Discussion for IS-IS Flooding Speed<o:p></=
o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"color:#1F497D;mso-ansi-language:EN-US">Les,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"color:#1F497D;mso-ansi-language:EN-US">After nearly 2 months, can we=
 expect an answer from your side?<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"color:#1F497D;mso-ansi-language:EN-US">More specifically, the below =
question<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;mso-ansi-langua=
ge:EN-US">[Bruno] _Assuming_ that the parameters are static, the parameters=
 proposed in draft-decraene-lsr-isis-flooding-speed
 are the same as the one implemented (configured) on multiple implementatio=
ns, including the one from your employer.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;mso-ansi-langua=
ge:EN-US">Now do you believe that those parameters can be determined?<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;mso-ansi-langua=
ge:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;mso-ansi-langua=
ge:EN-US">=A7&nbsp; If yes, how do you do _today_ on your implementation? (=
this seems to contradict your statement that you have no
 way to figure out how to find the right value)<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;mso-ansi-langua=
ge:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;mso-ansi-langua=
ge:EN-US">=A7&nbsp; If no, why did you implement those parameters, and ask =
network operator to configure them?<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"color:#1F497D;mso-ansi-language:EN-US">Thank you,<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"color:#1F497D;mso-ansi-language:EN-US">--Bruno<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><b><span style=3D"font-=
size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">From:</s=
pan></b><span style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&quo=
t;sans-serif&quot;"> DECRAENE Bruno TGI/OLN
<br>
<b>Sent:</b> Wednesday, February 26, 2020 8:03 PM<br>
<b>To:</b> 'Les Ginsberg (ginsberg)'<br>
<b>Cc:</b> <a href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a><br>
<b>Subject:</b> RE: Flow Control Discussion for IS-IS Flooding Speed<o:p></=
o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span style=3D"color:#1=
F497D">Les,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span style=3D"color:#1=
F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span style=3D"color:#1=
F497D">Please see inline[Bruno]<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span style=3D"color:#1=
F497D"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><b><span style=3D"font=
-size:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">From:</=
span></b><span style=3D"font-size:10.0pt;font-family:&quot;Tahoma&quot;,&qu=
ot;sans-serif&quot;"> Lsr [<a href=3D"mailto:lsr-bounces@ietf.org">mailto:l=
sr-bounces@ietf.org</a>]
<b>On Behalf Of </b>Les Ginsberg (ginsberg)<br>
<b>Sent:</b> Wednesday, February 19, 2020 3:32 AM<br>
<b>To:</b> <a href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a><br>
<b>Subject:</b> Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed<=
o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">Base protocol operation of the Update proc=
ess tracks the flooding of<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">LSPs/interface and guarantees timer-based =
retransmission on P2P interfaces<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">until an acknowledgment is received.<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">Using this base protocol mechanism in comb=
ination with exponential backoff of the<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">retransmission timer provides flow control=
 in the event of temporary overload<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">of the receiver.
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">This mechanism works without protocol exte=
nsions, is dynamic, operates<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">independent of the reason for delayed ackn=
owledgment (dropped packets, CPU<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">overload), and does not require additional=
 signaling during the overloaded<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">period.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">This is consistent with the recommendation=
s in RFC 4222 (OSPF).<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">Receiver-based flow control (as proposed in
<a href=3D"https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-floodin=
g-speed/">
https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/</a=
> )<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">requires protocol extensions and introduce=
s additional signaling during<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">periods of high load. The asserted reason =
for this is to optimize throughput -<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">but there is no evidence that it will achi=
eve this goal.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">Mention has been made to TCP-like flow con=
trol mechanisms as a model - which<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">are indeed receiver based. However, there =
are significant differences between<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">TCP sessions and IGP flooding.<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">TCP consists of a single session between t=
wo endpoints. Resources<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">(primarily buffer space) for this session =
are typically allocated in the<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">control plane and current usage is easily =
measurable..<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">IGP flooding is point-to-multi-point, reso=
urces to support IGP flooding<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">involve both control plane queues and data=
plane queues, both of which are<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">typically not per interface - nor even ded=
icated to a particular protocol<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">instance. What input is required to optimi=
ze receiver-based flow control is not fully specified.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US"><a href=3D"https://datatracker.ietf.org/do=
c/draft-decraene-lsr-isis-flooding-speed/">https://datatracker.ietf.org/doc=
/draft-decraene-lsr-isis-flooding-speed/</a>
 suggests (Section 5) that the values<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">to be advertised:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">&quot;use a formula based on an off line t=
ests of<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">&nbsp;&nbsp; the overall LSPDU processing =
speed for a particular set of hardware<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">&nbsp;&nbsp; and the number of interfaces =
configured for IS-IS&quot;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">implying that the advertised value is inte=
ntionally not dynamic. As such,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">it could just as easily be configured on t=
he transmit side and not require<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">additional signaling. As a static value, i=
t would necessarily be somewhat<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">conservative as it has to account for the =
worst case under the current<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">configuration - which means it needs to co=
nsider concurrent use of the CPU<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">and dataplane by all protocols/features wh=
ich are enabled on a router - not all of whose<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">use is likely to be synchronized with peak=
 IS-IS flooding load.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"color:#1F497D;mso-ansi-language:EN-US">[Bruno] _<i>Assuming</i>_ tha=
t the parameters are static, those parameters
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:142.8pt;text-indent:-18.=
0pt"><span lang=3D"EN-US" style=3D"font-family:&quot;Courier New&quot;;colo=
r:#1F497D;mso-ansi-language:EN-US">o</span><span lang=3D"EN-US" style=3D"fo=
nt-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;;col=
or:#1F497D;mso-ansi-language:EN-US">&nbsp;&nbsp;
</span><span lang=3D"EN-US" style=3D"color:#1F497D;mso-ansi-language:EN-US"=
>are the same as the one implemented (configured) on multiple implementatio=
ns, including the one from your employer. Now do you believe that those par=
ameters can be determined?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:178.8pt;text-indent:-18.=
0pt"><span lang=3D"EN-US" style=3D"font-family:Wingdings;color:#1F497D;mso-=
ansi-language:EN-US">=A7</span><span lang=3D"EN-US" style=3D"font-size:7.0p=
t;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;;color:#1F497D;m=
so-ansi-language:EN-US">&nbsp;
</span><span lang=3D"EN-US" style=3D"color:#1F497D;mso-ansi-language:EN-US"=
>If yes, how do you do _<i>today</i>_ on your implementation? (this seems t=
o contradict your statement that you have no way to figure out how to find =
the right value)<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:178.8pt;text-indent:-18.=
0pt"><span lang=3D"EN-US" style=3D"font-family:Wingdings;color:#1F497D;mso-=
ansi-language:EN-US">=A7</span><span lang=3D"EN-US" style=3D"font-size:7.0p=
t;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;;color:#1F497D;m=
so-ansi-language:EN-US">&nbsp;
</span><span lang=3D"EN-US" style=3D"color:#1F497D;mso-ansi-language:EN-US"=
>If no, why did you implement those parameters, and ask network operator to=
 configure them?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:178.8pt;text-indent:-18.=
0pt"><span lang=3D"EN-US" style=3D"font-family:Wingdings;color:#1F497D;mso-=
ansi-language:EN-US">=A7</span><span lang=3D"EN-US" style=3D"font-size:7.0p=
t;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;;color:#1F497D;m=
so-ansi-language:EN-US">&nbsp;
</span><span lang=3D"EN-US" style=3D"color:#1F497D;mso-ansi-language:EN-US"=
>There is also the option to reply: I don&#8217;t know but don&#8217;t care=
 as I leave the issue to the network operator.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:142.8pt;text-indent:-18.=
0pt"><span lang=3D"EN-US" style=3D"font-family:&quot;Courier New&quot;;colo=
r:#1F497D;mso-ansi-language:EN-US">o</span><span lang=3D"EN-US" style=3D"fo=
nt-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;;col=
or:#1F497D;mso-ansi-language:EN-US">&nbsp;&nbsp;
</span><span lang=3D"EN-US" style=3D"color:#1F497D;mso-ansi-language:EN-US"=
>can still provide some form of dynamicity, by using the PSNP as dynamic ac=
knowledgement.
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:142.8pt;text-indent:-18.=
0pt"><span lang=3D"EN-US" style=3D"font-family:&quot;Courier New&quot;;colo=
r:#1F497D;mso-ansi-language:EN-US">o</span><span lang=3D"EN-US" style=3D"fo=
nt-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;;col=
or:#1F497D;mso-ansi-language:EN-US">&nbsp;&nbsp;
</span><span lang=3D"EN-US" style=3D"color:#1F497D;mso-ansi-language:EN-US"=
>are really dependent on the receiver, not the sender.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:178.8pt;text-indent:-18.=
0pt"><span lang=3D"EN-US" style=3D"font-family:Wingdings;color:#1F497D;mso-=
ansi-language:EN-US">=A7</span><span lang=3D"EN-US" style=3D"font-size:7.0p=
t;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;;color:#1F497D;m=
so-ansi-language:EN-US">&nbsp;
</span><span lang=3D"EN-US" style=3D"color:#1F497D;mso-ansi-language:EN-US"=
>the sender will never overload itself.
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:178.8pt;text-indent:-18.=
0pt"><span lang=3D"EN-US" style=3D"font-family:Wingdings;color:#1F497D;mso-=
ansi-language:EN-US">=A7</span><span lang=3D"EN-US" style=3D"font-size:7.0p=
t;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;;color:#1F497D;m=
so-ansi-language:EN-US">&nbsp;
</span><span lang=3D"EN-US" style=3D"color:#1F497D;mso-ansi-language:EN-US"=
>The receiver has more information,&nbsp; knowing its processing power (low=
 end, high end, 80s, 20s (currently we are stuck with 20 years old value as=
suming the worst possible receiver (and worst
 there were, including with packet processing partly done in the control pl=
ane processor)), its expected IS-IS load (#neighbors), its preference for b=
ursty LSP reception (high delay between IS-IS CPU allocation cycles, memory=
 not an issue up to x kilo-octet&#8230;),
 its expected control plane load if IS-IS traffic has not higher priority o=
ver other control plane traffic&#8230;), it&#8217;s expected level of QoS p=
rioritization [1]<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:214.8pt;text-indent:-18.=
0pt"><span lang=3D"EN-US" style=3D"font-family:Symbol;color:#1F497D;mso-ans=
i-language:EN-US">=B7</span><span lang=3D"EN-US" style=3D"font-size:7.0pt;f=
ont-family:&quot;Times New Roman&quot;,&quot;serif&quot;;color:#1F497D;mso-=
ansi-language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><span lang=3D"EN-US" style=3D"color:#1F497D;mso-ansi-language:EN-US"=
>&nbsp;[1] looks for &#8220;Extended SPD Headroom&#8221;. E.g. &#8220;</spa=
n><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-US">Since IGP and link=
 stability are more tenuous and more crucial than BGP stability,
 such packets are now given the highest priority and are given extended SPD=
 headroom with a default of 10 packets. This means that these packets are n=
ot dropped if the size of the input hold queue is lower than 185 (input que=
ue default size &#43; spd headroom size
 &#43; spd extended headroom).&#8221;<span style=3D"color:#1F497D"><o:p></o=
:p></span></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:250.8pt;text-indent:-18.=
0pt"><span lang=3D"EN-US" style=3D"font-family:&quot;Courier New&quot;;colo=
r:#1F497D;mso-ansi-language:EN-US">o</span><span lang=3D"EN-US" style=3D"fo=
nt-size:7.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;;col=
or:#1F497D;mso-ansi-language:EN-US">&nbsp;&nbsp;
</span><span lang=3D"EN-US" style=3D"color:#1F497D;mso-ansi-language:EN-US"=
>And this is for distributed architecture, 15 years ago. So what about usin=
g the above number (in the router configuration), applies Tony&#8217;s prop=
osal (*oversubscription/number of IS neighbhors),
 and advertise this value to your LSP sender?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:106.8pt"><span lang=3D"E=
N-US" style=3D"color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:212.4pt"><span lang=3D"E=
N-US" style=3D"color:#1F497D;mso-ansi-language:EN-US">[1]
<a href=3D"https://www.cisco.com/c/en/us/support/docs/routers/12000-series-=
routers/29920-spd.html">
https://www.cisco.com/c/en/us/support/docs/routers/12000-series-routers/299=
20-spd.html</a>
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt"><span lang=3D"EN-US" st=
yle=3D"color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:106.8pt;text-indent:-18.=
0pt"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-ansi-language:EN-US">-=
</span><span lang=3D"EN-US" style=3D"font-size:7.0pt;font-family:&quot;Time=
s New Roman&quot;,&quot;serif&quot;;color:#1F497D;mso-ansi-language:EN-US">=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span><span lang=3D"EN-US" style=3D"color:#1F497D;mso-ansi-language:EN-US"=
><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"color:#1F497D;mso-ansi-language:EN-US">--Bruno<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"color:#1F497D;mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">Unless a good case can be made as to why t=
ransmit-based flow control is not a good<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">fit and why receiver-based flow control is=
 demonstrably better, it seems<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">unnecessary to extend the protocol.<o:p></=
o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">&nbsp;&nbsp;&nbsp; Les<o:p></o:p></span></=
p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><b><span lang=3D"EN-US=
" style=3D"mso-ansi-language:EN-US">From:</span></b><span lang=3D"EN-US" st=
yle=3D"mso-ansi-language:EN-US"> Lsr &lt;<a href=3D"mailto:lsr-bounces@ietf=
.org">lsr-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Les Ginsberg (ginsberg)<br>
<b>Sent:</b> Tuesday, February 18, 2020 6:25 PM<br>
<b>To:</b> <a href=3D"mailto:lsr@ietf.org">lsr@ietf.org</a><br>
<b>Subject:</b> [Lsr] Flow Control Discussion for IS-IS Flooding Speed<o:p>=
</o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">Two recent drafts advocate for the use of =
faster LSP flooding speeds in IS-IS:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US"><a href=3D"https://datatracker.ietf.org/do=
c/draft-decraene-lsr-isis-flooding-speed/">https://datatracker.ietf.org/doc=
/draft-decraene-lsr-isis-flooding-speed/</a><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US"><a href=3D"https://datatracker.ietf.org/do=
c/draft-ginsberg-lsr-isis-flooding-scale/">https://datatracker.ietf.org/doc=
/draft-ginsberg-lsr-isis-flooding-scale/</a><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">There is strong agreement on two key point=
s:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">1)Modern networks require much faster floo=
ding speeds than are commonly in use today<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">2)To deploy faster flooding speeds safely =
some form of flow control is needed<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">The key point of contention between the tw=
o drafts is how flow control should be implemented.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US"><a href=3D"https://datatracker.ietf.org/do=
c/draft-decraene-lsr-isis-flooding-speed/">https://datatracker.ietf.org/doc=
/draft-decraene-lsr-isis-flooding-speed/</a>
 advocates for a receiver based flow control where the receiver advertises =
in hellos the parameters which indicate the rate/burst size which the recei=
ver is capable of supporting on the interface. Senders are required to limi=
t the rate of LSP transmission on
 that interface in accordance with the values advertised by the receiver.<o=
:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US"><a href=3D"https://datatracker.ietf.org/do=
c/draft-ginsberg-lsr-isis-flooding-scale/">https://datatracker.ietf.org/doc=
/draft-ginsberg-lsr-isis-flooding-scale/</a>
 &nbsp;advocates for a transmit based flow control where the transmitter mo=
nitors the number of unacknowledged LSPs sent on each interface and impleme=
nts a backoff algorithm to slow the rate of sending LSPs based on the lengt=
h of the per interface unacknowledged
 queue.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">While other differences between the two dr=
afts exist, it is fair to say that if agreement could be reached on the for=
m of flow control&nbsp; then it is likely other
 issues could be resolved easily.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US">This email starts the discussion regarding=
 the flow control issue.
<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt"><span lang=3D"EN-US" s=
tyle=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"margin-left:106.2pt"><span lang=3D"EN-US=
" style=3D"mso-ansi-language:EN-US"><o:p>&nbsp;</o:p></span></p>
</div>
<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
pt 687.0pt 732.8pt"><span style=3D"font-size:10.0pt;font-family:&quot;Couri=
er New&quot;">_____________________________________________________________=
____________________________________________________________<o:p></o:p></sp=
an></pre>
<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
pt 687.0pt 732.8pt"><span style=3D"font-size:10.0pt;font-family:&quot;Couri=
er New&quot;"><o:p>&nbsp;</o:p></span></pre>
<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
pt 687.0pt 732.8pt"><span style=3D"font-size:10.0pt;font-family:&quot;Couri=
er New&quot;">Ce message et ses pieces jointes peuvent contenir des informa=
tions confidentielles ou privilegiees et ne doivent donc<o:p></o:p></span><=
/pre>
<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
pt 687.0pt 732.8pt"><span style=3D"font-size:10.0pt;font-family:&quot;Couri=
er New&quot;">pas etre diffuses, exploites ou copies sans autorisation. Si =
vous avez recu ce message par erreur, veuillez le signaler<o:p></o:p></span=
></pre>
<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
pt 687.0pt 732.8pt"><span style=3D"font-size:10.0pt;font-family:&quot;Couri=
er New&quot;">a l'expediteur et le detruire ainsi que les pieces jointes. L=
es messages electroniques etant susceptibles d'alteration,<o:p></o:p></span=
></pre>
<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
pt 687.0pt 732.8pt"><span style=3D"font-size:10.0pt;font-family:&quot;Couri=
er New&quot;">Orange decline toute responsabilite si ce message a ete alter=
e, deforme ou falsifie. Merci.<o:p></o:p></span></pre>
<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
pt 687.0pt 732.8pt"><span style=3D"font-size:10.0pt;font-family:&quot;Couri=
er New&quot;"><o:p>&nbsp;</o:p></span></pre>
<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
pt 687.0pt 732.8pt"><span style=3D"font-size:10.0pt;font-family:&quot;Couri=
er New&quot;">This message and its attachments may contain confidential or =
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<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
pt 687.0pt 732.8pt"><span style=3D"font-size:10.0pt;font-family:&quot;Couri=
er New&quot;">they should not be distributed, used or copied without author=
isation.<o:p></o:p></span></pre>
<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
pt 687.0pt 732.8pt"><span style=3D"font-size:10.0pt;font-family:&quot;Couri=
er New&quot;">If you have received this email in error, please notify the s=
ender and delete this message and its attachments.<o:p></o:p></span></pre>
<pre style=3D"margin-left:35.4pt;tab-stops:45.8pt 91.6pt 137.4pt 183.2pt 22=
9.0pt 274.8pt 320.6pt 366.4pt 412.2pt 458.0pt 503.8pt 549.6pt 595.4pt 641.2=
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From: Tony Przygienda <tonysietf@gmail.com>
Date: Wed, 22 Apr 2020 12:25:14 -0700
Message-ID: <CA+wi2hPd0Ccn_RiSf=EMa6BfPVhN5FnnOR2hz1PeWpMNNub-BA@mail.gmail.com>
To: Bruno Decraene <bruno.decraene@orange.com>
Cc: "lsr@ietf.org" <lsr@ietf.org>,  "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/ADeLrYZ15BJXGZe0ZOF3rUrrNRk>
Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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On Wed, Apr 22, 2020 at 11:03 AM <bruno.decraene@orange.com> wrote:

> Tony, all,
>
>
>
> Thanks Tony for the technical and constructive feedback.
>
> Please inline [Bruno]
>
>
>
> *From:* Tony Przygienda [mailto:tonysietf@gmail.com]
> *Sent:* Wednesday, April 22, 2020 1:19 AM
> *To:* Les Ginsberg (ginsberg)
> *Cc:* DECRAENE Bruno TGI/OLN; lsr@ietf.org
> *Subject:* Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
>
>
>
> neither am I aware of anything like this (i.e. per platform/product
> flooding rate constants) in any major vendor stack for whatever that's
> worth. It's simply unmaintanable, point. All major vendors have extensive
> product lines over so many changing hardware configuration/setups it is
> simply not viable to attempt precise measurements (and even then, user
> changing config can throw the stuff off in a millisecond). There may have
> been here and there per deployment scenario some "recommended config"
> (not something I immediately recall either) but that means very fixed
> configuration of things & how they go into networks and even then I'm not
> aware of anyone having had a "precise model of the chain in the box". yes=
,
> probes to measure lots and lots of stuff in the boxes exist but again,
> those are chip/linecard/backplane/chassis/routing engine specific and
> mostly used in complex test/peformance scenarios and not to derive some
> kind of equations that can predict anything much ...
>
> [Bruno] Good points.
>
> Yet, one of the information that we propose to advertise by the LSP
> receiver to the LSP sender is the Receive Window.
>
> -          This is a very common parameter and algorithm. Nothing fancy
> nor reinvented. In particular it=E2=80=99s a parameter used by TCP.
>
> -          I would argue that TCP implementations also run on a variety
> of hardware and systems, must wider range than IS-IS platform. And those
> TCP implementations on all those platform manage to advertise this
> parameter (TCP window)
>
> -          I fail to understand that when some WG contributors proposed
> the use of TCP, nobody said that determining and advertising a Receive
> Window would be an issue, difficult or even impossible. But when we propo=
se
> to advertise a Receive Window in an IS-IS TLV, this becomes difficult or
> even impossible for some platforms. Can anyone help me understand the
> technical difference?
>
>
>

Bruno, I was waiting for that ;-) Discounted for the fact that I'm not a
major TCP expert: TCP is a very different beast. it has a 100-200msec fast
timer & 500msec slow (which have to be quite accurate, it's really one
timer for all connections + mbuf and other magic) and it sends a _lot_ of
packets back and forth with window size indications so the negotiation can
happen very quickly.  Also, TCP can detect losses based on sequence number
received contrary to routing protocols (that's one of the things we added
in RIFT BTW) and it can retransmit quickly when it sees a "hole". Contrary
to that in ISIS ACKs may or may not come, they may be bundled, hellos may
or may not come and we can't retransmit stuff on 100msec timers either.
It's an utterly different transport channel.

In more abstract terms, TCP is a sliding N-window protocol (where N is
adjusted all the time & losses can be efficiently detected) whereas LSR
flooding is not a windowing protocol (or rather LSDB-size window protocol
with selective retransmission but no detection of loss [or only very slow
based on lack of ACK & CSNPs]). Disadvantage of something like TCP (I think
I sent out the RFC with UDP control protocol work to make it more TCP like)
is that you are stuck when you put something into the pipe, no
prioritization possible and if receiver is slow you may have multiple
obsolete copies in the pipe waiting & lots retransmission BW when holes are
punched into the data through loss. And plain TCP  is actually quite bad
for control protocol traffic @ scale, almost all vendor run special version
of it for BGP for that reason. Why that is is out of scope of this list I
think ... Flooding is really good to send lots of data prioritized/in
parallel but on losses re-TX is slow.


> Bruno, if you're so deeply interested in that stuff we can talk 1:1
> off-line about implementation work on rift towards adapatable flooding
> rate
>
> [Bruno] Sure. My pleasure. Please propose me some timeslot offline. Pleas=
e
> note that I=E2=80=99m based in Europe (CEST), so a priori during your mor=
ning and
> my evening.
>
> If you can also extend the offer to discuss the implementation work on th=
e
> IS-IS implementation of your employer with regards to adaptable flooding
> rate, and/or how network operator can configure the CLI parameters of the
> LSP senders so as to improve flooding rate without overloading the Junipe=
r
> receiver (possibly depending on the capability of the receiver, its numbe=
r
> of IS-IS neighbors=E2=80=A6 and/or whatever parameter that you feel are r=
elevant)
> that would be most appreciated. And if you believe that the Juniper LSP
> receiver can handle any rate from any reasonable (e.g. 50)  number of IGP
> neighbors, without (significantly) dropping the received LSPs, that would
> be even simpler, please advise.
>
>
>
>
>

ping me for that 1:1 on company email pls

-- tony

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<div dir=3D"ltr"><div dir=3D"ltr"><br></div><br><div class=3D"gmail_quote">=
<div dir=3D"ltr" class=3D"gmail_attr">On Wed, Apr 22, 2020 at 11:03 AM &lt;=
<a href=3D"mailto:bruno.decraene@orange.com">bruno.decraene@orange.com</a>&=
gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0=
px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">







<div lang=3D"FR">
<div class=3D"gmail-m_2484166253138266685WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,&quot;sans-serif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">Tony,=
 all,</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,&quot;sans-serif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">=C2=
=A0</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,&quot;sans-serif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">Thank=
s Tony for the technical and constructive feedback.</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,&quot;sans-serif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">Pleas=
e inline [Bruno]</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,&quot;sans-serif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">=C2=
=A0</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><b><span style=3D"font-=
size:10pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;" lang=3D"EN=
-US">From:</span></b><span style=3D"font-size:10pt;font-family:&quot;Tahoma=
&quot;,&quot;sans-serif&quot;" lang=3D"EN-US">
 Tony Przygienda [mailto:<a href=3D"mailto:tonysietf@gmail.com" target=3D"_=
blank">tonysietf@gmail.com</a>] <br>
<b>Sent:</b> Wednesday, April 22, 2020 1:19 AM<br>
<b>To:</b> Les Ginsberg (ginsberg)<br>
<b>Cc:</b> DECRAENE Bruno TGI/OLN; <a href=3D"mailto:lsr@ietf.org" target=
=3D"_blank">lsr@ietf.org</a><br>
<b>Subject:</b> Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed<=
/span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US">=
=C2=A0</span></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US">ne=
ither am I aware of anything like this (i.e. per platform/product flooding =
rate constants) in any major vendor stack for whatever that&#39;s worth. It=
&#39;s simply
<span class=3D"gmail-m_2484166253138266685SpellE">unmaintanable</span>, poi=
nt. All major vendors have extensive product lines over so many changing ha=
rdware configuration/setups it is simply not viable to attempt precise meas=
urements (and even then, user changing
<span class=3D"gmail-m_2484166253138266685SpellE">config</span> can throw t=
he stuff off in a millisecond). There may have been here and there per depl=
oyment scenario some &quot;recommended
<span class=3D"gmail-m_2484166253138266685SpellE">config</span>&quot; (not =
something I immediately recall either) but that means very fixed configurat=
ion of things &amp; how they go into networks and even then I&#39;m not awa=
re of anyone having had a &quot;precise model of the chain in the box&quot;=
. yes, probes
 to measure lots and lots of stuff in the boxes exist but again, those are =
chip/<span class=3D"gmail-m_2484166253138266685SpellE">linecard</span>/back=
plane/chassis/routing engine specific and mostly used in complex test/<span=
 class=3D"gmail-m_2484166253138266685SpellE">peformance</span> scenarios an=
d not to derive
 some kind of equations that can predict anything much ... </span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,&quot;sans-serif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">[Brun=
o] Good points.</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,&quot;sans-serif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">Yet, =
one of the information that we propose to advertise by the LSP receiver to
 the LSP sender is the Receive Window.</span></p>
<p class=3D"gmail-m_2484166253138266685MsoListParagraph"><span style=3D"fon=
t-size:11pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:rg=
b(31,73,125)" lang=3D"EN-US"><span>-<span style=3D"font:7pt &quot;Times New=
 Roman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><span style=3D"font-size:11pt;font-family:&quot;Calibr=
i&quot;,&quot;sans-serif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">This is=
 a very common parameter and algorithm. Nothing fancy nor reinvented.
 In particular it=E2=80=99s a parameter used by TCP.</span></p>
<p class=3D"gmail-m_2484166253138266685MsoListParagraph"><span style=3D"fon=
t-size:11pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:rg=
b(31,73,125)" lang=3D"EN-US"><span>-<span style=3D"font:7pt &quot;Times New=
 Roman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><span style=3D"font-size:11pt;font-family:&quot;Calibr=
i&quot;,&quot;sans-serif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">I would=
 argue that TCP implementations also run on a variety of hardware
 and systems, must wider range than IS-IS platform. And those TCP implement=
ations on all those platform manage to advertise this parameter (TCP window=
)</span></p>
<p class=3D"gmail-m_2484166253138266685MsoListParagraph"><span style=3D"fon=
t-size:11pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:rg=
b(31,73,125)" lang=3D"EN-US"><span>-<span style=3D"font:7pt &quot;Times New=
 Roman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><span style=3D"font-size:11pt;font-family:&quot;Calibr=
i&quot;,&quot;sans-serif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">I fail =
to understand that when some WG contributors proposed the use of
 TCP, nobody said that determining and advertising a Receive Window would b=
e an issue, difficult or even impossible. But when we propose to advertise =
a Receive Window in an IS-IS TLV, this becomes difficult or even impossible=
 for some platforms. Can anyone
 help me understand the technical difference?</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US">=
=C2=A0</span></p></div></div></div></div></blockquote><div><br></div><div>B=
runo, I was waiting for that ;-) Discounted for the fact that I&#39;m not a=
 major TCP expert: TCP is a very different beast. it has a 100-200msec fast=
 timer &amp; 500msec slow (which have to be quite accurate, it&#39;s really=
 one timer for all connections=C2=A0+ mbuf and other magic) and it sends a =
_lot_ of packets back and forth with window size indications so the negotia=
tion can happen very quickly.=C2=A0 Also, TCP can detect losses based on se=
quence number received contrary to routing protocols (that&#39;s one of the=
 things we added in RIFT BTW) and it can retransmit quickly when it sees a =
&quot;hole&quot;. Contrary to that in ISIS ACKs may or may not come, they m=
ay be bundled, hellos may or may not come and we can&#39;t retransmit stuff=
 on 100msec timers either. It&#39;s an utterly different transport channel.=
 <br></div><div><br></div><div>In more abstract terms, TCP is a sliding N-w=
indow protocol (where N is adjusted all the time &amp; losses can be effici=
ently detected) whereas LSR flooding is not a windowing protocol (or rather=
 LSDB-size window protocol with selective retransmission but no detection o=
f loss [or only very slow based on lack of ACK &amp; CSNPs]). Disadvantage =
of something like TCP (I think I sent out the RFC with UDP control protocol=
 work to make it more TCP like) is that you are stuck when you put somethin=
g into the pipe, no prioritization possible and if receiver is slow you may=
 have multiple obsolete copies in the pipe waiting &amp; lots retransmissio=
n BW when holes are punched into the data through loss. And plain TCP=C2=A0=
 is actually quite bad for control protocol traffic @ scale, almost all ven=
dor run special version of it for BGP for that reason. Why that is is out o=
f scope of this list I think ... Flooding is really good to send lots of da=
ta prioritized/in parallel but on losses re-TX is slow.<br></div><div>=C2=
=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8e=
x;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang=3D"FR"=
><div class=3D"gmail-m_2484166253138266685WordSection1"><div><div><p class=
=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"></span></p=
>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US">Br=
uno, if you&#39;re so deeply interested in that stuff we can talk 1:1 off-l=
ine about implementation work on rift towards
<span class=3D"gmail-m_2484166253138266685SpellE">adapatable</span> floodin=
g rate<span style=3D"color:rgb(31,73,125)"></span></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,&quot;sans-serif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">[Brun=
o] Sure. My pleasure. Please propose me some timeslot offline. Please note
 that I=E2=80=99m based in Europe (CEST), so a priori during your morning a=
nd my evening.</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,&quot;sans-serif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">If yo=
u can also extend the offer to discuss the implementation work on the IS-IS
 implementation of your employer with regards to adaptable flooding rate, a=
nd/or how network operator can configure the CLI parameters of the LSP send=
ers so as to improve flooding rate without overloading the Juniper receiver=
 (possibly depending on the capability
 of the receiver, its number of IS-IS neighbors=E2=80=A6 and/or whatever pa=
rameter that you feel are relevant) that would be most appreciated. And if =
you believe that the Juniper LSP receiver can handle any rate from any reas=
onable (e.g. 50)
<span>=C2=A0</span>number of IGP neighbors, without (significantly) droppin=
g the received LSPs, that would be even simpler, please advise.</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,&quot;sans-serif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">=C2=
=A0</span></p></div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US">=
=C2=A0</span></p></div></div></div></div></blockquote></div><div class=3D"g=
mail_quote"><br></div><div class=3D"gmail_quote">ping me for that 1:1 on co=
mpany email pls <br></div><div class=3D"gmail_quote"><br></div><div class=
=3D"gmail_quote">-- tony <br></div></div>

--00000000000026424805a3e61b7a--


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To: bruno.decraene@orange.com, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
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From: Peter Psenak <ppsenak@cisco.com>
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Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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Bruno,

On 22/04/2020 20:04, bruno.decraene@orange.com wrote:
> Les,
> 
> Pleasesee inline
> 
> *From:*Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]
> *Sent:* Tuesday, April 21, 2020 11:48 PM
> *To:* DECRAENE Bruno TGI/OLN
> *Cc:* lsr@ietf.org
> *Subject:* RE: Flow Control Discussion for IS-IS Flooding Speed
> 
> Bruno –
> 
> You have made an assumption that historically vendors have tuned LSP 
> transmission rates to a platform specific value.
> 
> [Bruno] I don’t think so. What makes you think so?
> 
> In all cases, that is not my assumption, and for multiple reasons.
> 
> That certainly is not true in the case of my employer (happy to hear 
> what other vendors have been doing for the past 20 years).
> 
> The default value is based on minimumBroadcastLSPTransmissionInterval 
> specified in ISO10589.
> 
> A knob is available to allow tuning (faster or slower) in a given 
> deployment – though in my experience this knob is rarely used.
> 
> *//*[Bruno] I would agree on both. More interestingly is the why: why 
> aren’t those existing sending parameters tuned, while we agree that 
> default configuration are suboptimal?
> 
> My take is that:
> 
> -We don’t want to overload the receiver and create loss of LSP (as this 
> will delay the LSDB synchronization and decrease the goodput). Hence 
> this (the parameters) is receiver dependent (e.g., platform type, number 
> of IGP adjacencies, …).
> 
> -We don’t know which value to configure : difficult for the network 
> operator to evaluate without a significant knowledge of the receiver 
> implementation (in particular QoS parameters for incoming LSP), vendors 
> are not really proposing value or guidance, especially since the sending 
> behavior is not standardized and slightly different between vendors. So 
> everyone stay safe with default 20 years old values.
> 
> We already discuss in 
> https://tools.ietf.org/html/draft-ginsberg-lsr-isis-flooding-scale-02#section-2 
> that this common interpretation isn’t the most appropriate, but 
> historically the concern has been to avoid flooding too fast – not to 
> optimize flooding speed.
> 
> Obviously, we are revisiting that approach and saying it needs to change 
> – which is something I think we have consensus on.
> 
> I have provided a description in my recent response as to why it is 
> difficult to derive an optimal value on a per platform basis. You may 
> disagree – but please do not claim that we actually have been doing this 
> for years. We haven’t been.
> 
> *//*[Bruno] I’m not sure how to rephrase my below email so that we could 
> understand each other, have an answer from your side (I mean employer 
> side), and progress.
> 
> More succinctly: How do network operator correctly configure the 
> flooding parameters value on the implementation of your employer? In 
> particular given the variety of conditions on the LSP receiver side.

the answer is test and see which value fits best in your specific 
environment.

One reason to have some sort of feedback mechanism (being it tx or rx 
based) is to avoid the need to tune today's static parameters and flood 
as fast as the receiver is able to consume and slow down if the receiver 
is not able to cope with the rate we flood.

thanks,
Peter






> 
> --Bruno
> 
>    Les
> 
> *From:*bruno.decraene@orange.com <bruno.decraene@orange.com>
> *Sent:* Monday, April 20, 2020 4:47 AM
> *To:* Les Ginsberg (ginsberg) <ginsberg@cisco.com>
> *Cc:* lsr@ietf.org
> *Subject:* RE: Flow Control Discussion for IS-IS Flooding Speed
> 
> Les,
> 
> After nearly 2 months, can we expect an answer from your side?
> 
> More specifically, the below question
> 
> [Bruno] _Assuming_ that the parameters are static, the parameters 
> proposed in draft-decraene-lsr-isis-flooding-speed are the same as the 
> one implemented (configured) on multiple implementations, including the 
> one from your employer.
> 
> Now do you believe that those parameters can be determined?
> 
> §  If yes, how do you do _today_ on your implementation? (this seems to 
> contradict your statement that you have no way to figure out how to find 
> the right value)
> 
> §  If no, why did you implement those parameters, and ask network 
> operator to configure them?
> 
> Thank you,
> 
> --Bruno
> 
> *From:*DECRAENE Bruno TGI/OLN
> *Sent:* Wednesday, February 26, 2020 8:03 PM
> *To:* 'Les Ginsberg (ginsberg)'
> *Cc:* lsr@ietf.org <mailto:lsr@ietf.org>
> *Subject:* RE: Flow Control Discussion for IS-IS Flooding Speed
> 
> Les,
> 
> Please see inline[Bruno]
> 
> *From:*Lsr [mailto:lsr-bounces@ietf.org] *On Behalf Of *Les Ginsberg 
> (ginsberg)
> *Sent:* Wednesday, February 19, 2020 3:32 AM
> *To:* lsr@ietf.org <mailto:lsr@ietf.org>
> *Subject:* Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
> 
> Base protocol operation of the Update process tracks the flooding of
> 
> LSPs/interface and guarantees timer-based retransmission on P2P interfaces
> 
> until an acknowledgment is received.
> 
> Using this base protocol mechanism in combination with exponential 
> backoff of the
> 
> retransmission timer provides flow control in the event of temporary 
> overload
> 
> of the receiver.
> 
> This mechanism works without protocol extensions, is dynamic, operates
> 
> independent of the reason for delayed acknowledgment (dropped packets, CPU
> 
> overload), and does not require additional signaling during the overloaded
> 
> period.
> 
> This is consistent with the recommendations in RFC 4222 (OSPF).
> 
> Receiver-based flow control (as proposed in 
> https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/ )
> 
> requires protocol extensions and introduces additional signaling during
> 
> periods of high load. The asserted reason for this is to optimize 
> throughput -
> 
> but there is no evidence that it will achieve this goal.
> 
> Mention has been made to TCP-like flow control mechanisms as a model - which
> 
> are indeed receiver based. However, there are significant differences 
> between
> 
> TCP sessions and IGP flooding.
> 
> TCP consists of a single session between two endpoints. Resources
> 
> (primarily buffer space) for this session are typically allocated in the
> 
> control plane and current usage is easily measurable..
> 
> IGP flooding is point-to-multi-point, resources to support IGP flooding
> 
> involve both control plane queues and dataplane queues, both of which are
> 
> typically not per interface - nor even dedicated to a particular protocol
> 
> instance. What input is required to optimize receiver-based flow control 
> is not fully specified.
> 
> https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/ 
> suggests (Section 5) that the values
> 
> to be advertised:
> 
> "use a formula based on an off line tests of
> 
>     the overall LSPDU processing speed for a particular set of hardware
> 
>     and the number of interfaces configured for IS-IS"
> 
> implying that the advertised value is intentionally not dynamic. As such,
> 
> it could just as easily be configured on the transmit side and not require
> 
> additional signaling. As a static value, it would necessarily be somewhat
> 
> conservative as it has to account for the worst case under the current
> 
> configuration - which means it needs to consider concurrent use of the CPU
> 
> and dataplane by all protocols/features which are enabled on a router - 
> not all of whose
> 
> use is likely to be synchronized with peak IS-IS flooding load.
> 
> [Bruno] _/Assuming/_ that the parameters are static, those parameters
> 
> oare the same as the one implemented (configured) on multiple 
> implementations, including the one from your employer. Now do you 
> believe that those parameters can be determined?
> 
> §If yes, how do you do _/today/_ on your implementation? (this seems to 
> contradict your statement that you have no way to figure out how to find 
> the right value)
> 
> §If no, why did you implement those parameters, and ask network operator 
> to configure them?
> 
> §There is also the option to reply: I don’t know but don’t care as I 
> leave the issue to the network operator.
> 
> ocan still provide some form of dynamicity, by using the PSNP as dynamic 
> acknowledgement.
> 
> oare really dependent on the receiver, not the sender.
> 
> §the sender will never overload itself.
> 
> §The receiver has more information,  knowing its processing power (low 
> end, high end, 80s, 20s (currently we are stuck with 20 years old value 
> assuming the worst possible receiver (and worst there were, including 
> with packet processing partly done in the control plane processor)), its 
> expected IS-IS load (#neighbors), its preference for bursty LSP 
> reception (high delay between IS-IS CPU allocation cycles, memory not an 
> issue up to x kilo-octet…), its expected control plane load if IS-IS 
> traffic has not higher priority over other control plane traffic…), it’s 
> expected level of QoS prioritization [1]
> 
> · [1] looks for “Extended SPD Headroom”. E.g. “Since IGP and link 
> stability are more tenuous and more crucial than BGP stability, such 
> packets are now given the highest priority and are given extended SPD 
> headroom with a default of 10 packets. This means that these packets are 
> not dropped if the size of the input hold queue is lower than 185 (input 
> queue default size + spd headroom size + spd extended headroom).”
> 
> oAnd this is for distributed architecture, 15 years ago. So what about 
> using the above number (in the router configuration), applies Tony’s 
> proposal (*oversubscription/number of IS neighbhors), and advertise this 
> value to your LSP sender?
> 
> [1] 
> https://www.cisco.com/c/en/us/support/docs/routers/12000-series-routers/29920-spd.html 
> 
> 
> -
> 
> --Bruno
> 
> Unless a good case can be made as to why transmit-based flow control is 
> not a good
> 
> fit and why receiver-based flow control is demonstrably better, it seems
> 
> unnecessary to extend the protocol.
> 
>      Les
> 
> *From:*Lsr <lsr-bounces@ietf.org <mailto:lsr-bounces@ietf..org>> *On 
> Behalf Of *Les Ginsberg (ginsberg)
> *Sent:* Tuesday, February 18, 2020 6:25 PM
> *To:* lsr@ietf.org <mailto:lsr@ietf.org>
> *Subject:* [Lsr] Flow Control Discussion for IS-IS Flooding Speed
> 
> Two recent drafts advocate for the use of faster LSP flooding speeds in 
> IS-IS:
> 
> https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/
> 
> https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/
> 
> There is strong agreement on two key points:
> 
> 1)Modern networks require much faster flooding speeds than are commonly 
> in use today
> 
> 2)To deploy faster flooding speeds safely some form of flow control is 
> needed
> 
> The key point of contention between the two drafts is how flow control 
> should be implemented.
> 
> https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/ 
> advocates for a receiver based flow control where the receiver 
> advertises in hellos the parameters which indicate the rate/burst size 
> which the receiver is capable of supporting on the interface. Senders 
> are required to limit the rate of LSP transmission on that interface in 
> accordance with the values advertised by the receiver.
> 
> https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/ 
>   advocates for a transmit based flow control where the transmitter 
> monitors the number of unacknowledged LSPs sent on each interface and 
> implements a backoff algorithm to slow the rate of sending LSPs based on 
> the length of the per interface unacknowledged queue.
> 
> While other differences between the two drafts exist, it is fair to say 
> that if agreement could be reached on the form of flow control  then it 
> is likely other issues could be resolved easily.
> 
> This email starts the discussion regarding the flow control issue.
> 
> _________________________________________________________________________________________________________________________
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> _________________________________________________________________________________________________________________________
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From: <bruno.decraene@orange.com>
To: Peter Psenak <ppsenak@cisco.com>, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
CC: "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
Thread-Index: AQHWGUlpbkJZPBB7TgK3RmmTteJ+KqiGZKPQ
Date: Thu, 23 Apr 2020 08:57:33 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/CFzdwYmWOKzd64Yk0hEGtAMO_W4>
Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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Subject: [Lsr] I-D Action: draft-ietf-lsr-isis-srv6-extensions-08.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Link State Routing WG of the IETF.

        Title           : IS-IS Extension to Support Segment Routing over IPv6 Dataplane
        Authors         : Peter Psenak
                          Clarence Filsfils
                          Ahmed Bashandy
                          Bruno Decraene
                          Zhibo Hu
	Filename        : draft-ietf-lsr-isis-srv6-extensions-08.txt
	Pages           : 26
	Date            : 2020-04-23

Abstract:
   Segment Routing (SR) allows for a flexible definition of end-to-end
   paths by encoding paths as sequences of topological sub-paths, called
   "segments".  Segment routing architecture can be implemented over an
   MPLS data plane as well as an IPv6 data plane.  This draft describes
   the IS-IS extensions required to support Segment Routing over an IPv6
   data plane.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-srv6-extensions/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-lsr-isis-srv6-extensions-08
https://datatracker.ietf.org/doc/html/draft-ietf-lsr-isis-srv6-extensions-08

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-lsr-isis-srv6-extensions-08


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/



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To: bruno.decraene@orange.com, "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
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From: Peter Psenak <ppsenak@cisco.com>
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Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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Bruno,

On 23/04/2020 10:57, bruno.decraene@orange.com wrote:
> Peter,
>   
>> From: Peter Psenak [mailto:ppsenak@cisco.com]
>>
>> Bruno,
>>
>> On 22/04/2020 20:04, bruno.decraene@orange.com wrote:
>>> Les,
>>>
>>> Pleasesee inline
>>>
>>> *From:*Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]
>>> *Sent:* Tuesday, April 21, 2020 11:48 PM
>>> *To:* DECRAENE Bruno TGI/OLN
>>> *Cc:* lsr@ietf.org
>>> *Subject:* RE: Flow Control Discussion for IS-IS Flooding Speed
>>>
>>> Bruno –
>>>
>>> You have made an assumption that historically vendors have tuned LSP
>>> transmission rates to a platform specific value.
>>>
>>> [Bruno] I don’t think so. What makes you think so?
>>>
>>> In all cases, that is not my assumption, and for multiple reasons.
>>>
>>> That certainly is not true in the case of my employer (happy to hear
>>> what other vendors have been doing for the past 20 years).
>>>
>>> The default value is based on minimumBroadcastLSPTransmissionInterval
>>> specified in ISO10589.
>>>
>>> A knob is available to allow tuning (faster or slower) in a given
>>> deployment – though in my experience this knob is rarely used.
>>>
>>> *//*[Bruno] I would agree on both. More interestingly is the why: why
>>> aren’t those existing sending parameters tuned, while we agree that
>>> default configuration are suboptimal?
>>>
>>> My take is that:
>>>
>>> -We don’t want to overload the receiver and create loss of LSP (as this
>>> will delay the LSDB synchronization and decrease the goodput). Hence
>>> this (the parameters) is receiver dependent (e.g., platform type, number
>>> of IGP adjacencies, …).
>>>
>>> -We don’t know which value to configure : difficult for the network
>>> operator to evaluate without a significant knowledge of the receiver
>>> implementation (in particular QoS parameters for incoming LSP), vendors
>>> are not really proposing value or guidance, especially since the sending
>>> behavior is not standardized and slightly different between vendors. So
>>> everyone stay safe with default 20 years old values.
>>>
>>> We already discuss in
>>> https://tools.ietf.org/html/draft-ginsberg-lsr-isis-flooding-scale-02#section-2
>>> that this common interpretation isn’t the most appropriate, but
>>> historically the concern has been to avoid flooding too fast – not to
>>> optimize flooding speed.
>>>
>>> Obviously, we are revisiting that approach and saying it needs to change
>>> – which is something I think we have consensus on.
>>>
>>> I have provided a description in my recent response as to why it is
>>> difficult to derive an optimal value on a per platform basis. You may
>>> disagree – but please do not claim that we actually have been doing this
>>> for years. We haven’t been.
>>>
>>> *//*[Bruno] I’m not sure how to rephrase my below email so that we could
>>> understand each other, have an answer from your side (I mean employer
>>> side), and progress.
>>>
>>> More succinctly: How do network operator correctly configure the
>>> flooding parameters value on the implementation of your employer? In
>>> particular given the variety of conditions on the LSP receiver side.
>>
>> the answer is test and see which value fits best in your specific
>> environment.
> 
> I don't think that's good enough, or even feasible given the very diverse set of platforms and environments in large networks, and/or the availability of human resources in smaller networks.
> Since Les is reporting that virtually nobody is changing the default value -although we now all agree that they are suboptimal- I think that this is an indication that this strategy is not working.
> That's why I brought this to the LSR WG.

we agree on the problem and the solution, for most part anyway.

I responded with the only option that is available today with existing 
protocol behavior and parameters available today.

thanks,
Peter



> 
> We need the IS-IS protocol to work adequately without requiring constant or personalized tuning from the network operator. Coming back to TCP, general user/terminals are not been asked to run test per terminal and per destination/server. It just work relatively adequately.
>   
>> One reason to have some sort of feedback mechanism (being it tx or rx
>> based) is to avoid the need to tune today's static parameters and flood
>> as fast as the receiver is able to consume and slow down if the receiver
>> is not able to cope with the rate we flood.
> 
> +1
>   
> Thanks,
> Bruno
> 
>> thanks,
>> Peter
>>
>>
>>
>>
>>
>>
>>>
>>> --Bruno
>>>
>>>     Les
>>>
>>> *From:*bruno.decraene@orange.com <bruno.decraene@orange.com>
>>> *Sent:* Monday, April 20, 2020 4:47 AM
>>> *To:* Les Ginsberg (ginsberg) <ginsberg@cisco.com>
>>> *Cc:* lsr@ietf.org
>>> *Subject:* RE: Flow Control Discussion for IS-IS Flooding Speed
>>>
>>> Les,
>>>
>>> After nearly 2 months, can we expect an answer from your side?
>>>
>>> More specifically, the below question
>>>
>>> [Bruno] _Assuming_ that the parameters are static, the parameters
>>> proposed in draft-decraene-lsr-isis-flooding-speed are the same as the
>>> one implemented (configured) on multiple implementations, including the
>>> one from your employer.
>>>
>>> Now do you believe that those parameters can be determined?
>>>
>>> §  If yes, how do you do _today_ on your implementation? (this seems to
>>> contradict your statement that you have no way to figure out how to find
>>> the right value)
>>>
>>> §  If no, why did you implement those parameters, and ask network
>>> operator to configure them?
>>>
>>> Thank you,
>>>
>>> --Bruno
>>>
>>> *From:*DECRAENE Bruno TGI/OLN
>>> *Sent:* Wednesday, February 26, 2020 8:03 PM
>>> *To:* 'Les Ginsberg (ginsberg)'
>>> *Cc:* lsr@ietf.org <mailto:lsr@ietf.org>
>>> *Subject:* RE: Flow Control Discussion for IS-IS Flooding Speed
>>>
>>> Les,
>>>
>>> Please see inline[Bruno]
>>>
>>> *From:*Lsr [mailto:lsr-bounces@ietf.org] *On Behalf Of *Les Ginsberg
>>> (ginsberg)
>>> *Sent:* Wednesday, February 19, 2020 3:32 AM
>>> *To:* lsr@ietf.org <mailto:lsr@ietf.org>
>>> *Subject:* Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
>>>
>>> Base protocol operation of the Update process tracks the flooding of
>>>
>>> LSPs/interface and guarantees timer-based retransmission on P2P interfaces
>>>
>>> until an acknowledgment is received.
>>>
>>> Using this base protocol mechanism in combination with exponential
>>> backoff of the
>>>
>>> retransmission timer provides flow control in the event of temporary
>>> overload
>>>
>>> of the receiver.
>>>
>>> This mechanism works without protocol extensions, is dynamic, operates
>>>
>>> independent of the reason for delayed acknowledgment (dropped packets, CPU
>>>
>>> overload), and does not require additional signaling during the overloaded
>>>
>>> period.
>>>
>>> This is consistent with the recommendations in RFC 4222 (OSPF).
>>>
>>> Receiver-based flow control (as proposed in
>>> https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/ )
>>>
>>> requires protocol extensions and introduces additional signaling during
>>>
>>> periods of high load. The asserted reason for this is to optimize
>>> throughput -
>>>
>>> but there is no evidence that it will achieve this goal.
>>>
>>> Mention has been made to TCP-like flow control mechanisms as a model - which
>>>
>>> are indeed receiver based. However, there are significant differences
>>> between
>>>
>>> TCP sessions and IGP flooding.
>>>
>>> TCP consists of a single session between two endpoints. Resources
>>>
>>> (primarily buffer space) for this session are typically allocated in the
>>>
>>> control plane and current usage is easily measurable..
>>>
>>> IGP flooding is point-to-multi-point, resources to support IGP flooding
>>>
>>> involve both control plane queues and dataplane queues, both of which are
>>>
>>> typically not per interface - nor even dedicated to a particular protocol
>>>
>>> instance. What input is required to optimize receiver-based flow control
>>> is not fully specified.
>>>
>>> https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/
>>> suggests (Section 5) that the values
>>>
>>> to be advertised:
>>>
>>> "use a formula based on an off line tests of
>>>
>>>      the overall LSPDU processing speed for a particular set of hardware
>>>
>>>      and the number of interfaces configured for IS-IS"
>>>
>>> implying that the advertised value is intentionally not dynamic. As such,
>>>
>>> it could just as easily be configured on the transmit side and not require
>>>
>>> additional signaling. As a static value, it would necessarily be somewhat
>>>
>>> conservative as it has to account for the worst case under the current
>>>
>>> configuration - which means it needs to consider concurrent use of the CPU
>>>
>>> and dataplane by all protocols/features which are enabled on a router -
>>> not all of whose
>>>
>>> use is likely to be synchronized with peak IS-IS flooding load.
>>>
>>> [Bruno] _/Assuming/_ that the parameters are static, those parameters
>>>
>>> oare the same as the one implemented (configured) on multiple
>>> implementations, including the one from your employer. Now do you
>>> believe that those parameters can be determined?
>>>
>>> §If yes, how do you do _/today/_ on your implementation? (this seems to
>>> contradict your statement that you have no way to figure out how to find
>>> the right value)
>>>
>>> §If no, why did you implement those parameters, and ask network operator
>>> to configure them?
>>>
>>> §There is also the option to reply: I don’t know but don’t care as I
>>> leave the issue to the network operator.
>>>
>>> ocan still provide some form of dynamicity, by using the PSNP as dynamic
>>> acknowledgement.
>>>
>>> oare really dependent on the receiver, not the sender.
>>>
>>> §the sender will never overload itself.
>>>
>>> §The receiver has more information,  knowing its processing power (low
>>> end, high end, 80s, 20s (currently we are stuck with 20 years old value
>>> assuming the worst possible receiver (and worst there were, including
>>> with packet processing partly done in the control plane processor)), its
>>> expected IS-IS load (#neighbors), its preference for bursty LSP
>>> reception (high delay between IS-IS CPU allocation cycles, memory not an
>>> issue up to x kilo-octet…), its expected control plane load if IS-IS
>>> traffic has not higher priority over other control plane traffic…), it’s
>>> expected level of QoS prioritization [1]
>>>
>>> · [1] looks for “Extended SPD Headroom”. E.g. “Since IGP and link
>>> stability are more tenuous and more crucial than BGP stability, such
>>> packets are now given the highest priority and are given extended SPD
>>> headroom with a default of 10 packets. This means that these packets are
>>> not dropped if the size of the input hold queue is lower than 185 (input
>>> queue default size + spd headroom size + spd extended headroom).”
>>>
>>> oAnd this is for distributed architecture, 15 years ago. So what about
>>> using the above number (in the router configuration), applies Tony’s
>>> proposal (*oversubscription/number of IS neighbhors), and advertise this
>>> value to your LSP sender?
>>>
>>> [1]
>>> https://www.cisco.com/c/en/us/support/docs/routers/12000-series-routers/29920-spd.html
>>>
>>>
>>> -
>>>
>>> --Bruno
>>>
>>> Unless a good case can be made as to why transmit-based flow control is
>>> not a good
>>>
>>> fit and why receiver-based flow control is demonstrably better, it seems
>>>
>>> unnecessary to extend the protocol.
>>>
>>>       Les
>>>
>>> *From:*Lsr <lsr-bounces@ietf.org <mailto:lsr-bounces@ietf..org>> *On
>>> Behalf Of *Les Ginsberg (ginsberg)
>>> *Sent:* Tuesday, February 18, 2020 6:25 PM
>>> *To:* lsr@ietf.org <mailto:lsr@ietf.org>
>>> *Subject:* [Lsr] Flow Control Discussion for IS-IS Flooding Speed
>>>
>>> Two recent drafts advocate for the use of faster LSP flooding speeds in
>>> IS-IS:
>>>
>>> https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/
>>>
>>> https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/
>>>
>>> There is strong agreement on two key points:
>>>
>>> 1)Modern networks require much faster flooding speeds than are commonly
>>> in use today
>>>
>>> 2)To deploy faster flooding speeds safely some form of flow control is
>>> needed
>>>
>>> The key point of contention between the two drafts is how flow control
>>> should be implemented.
>>>
>>> https://datatracker.ietf.org/doc/draft-decraene-lsr-isis-flooding-speed/
>>> advocates for a receiver based flow control where the receiver
>>> advertises in hellos the parameters which indicate the rate/burst size
>>> which the receiver is capable of supporting on the interface. Senders
>>> are required to limit the rate of LSP transmission on that interface in
>>> accordance with the values advertised by the receiver.
>>>
>>> https://datatracker.ietf.org/doc/draft-ginsberg-lsr-isis-flooding-scale/
>>>    advocates for a transmit based flow control where the transmitter
>>> monitors the number of unacknowledged LSPs sent on each interface and
>>> implements a backoff algorithm to slow the rate of sending LSPs based on
>>> the length of the per interface unacknowledged queue.
>>>
>>> While other differences between the two drafts exist, it is fair to say
>>> that if agreement could be reached on the form of flow control  then it
>>> is likely other issues could be resolved easily.
>>>
>>> This email starts the discussion regarding the flow control issue.
>>>
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>>> _________________________________________________________________________________________________________________________
>>>
>>> Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc
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>>> a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration,
>>> Orange decline toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci.
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>>> This message and its attachments may contain confidential or privileged information that may be protected by law;
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>>
> 
> _________________________________________________________________________________________________________________________
> 
> Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc
> pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu ce message par erreur, veuillez le signaler
> a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration,
> Orange decline toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci.
> 
> This message and its attachments may contain confidential or privileged information that may be protected by law;
> they should not be distributed, used or copied without authorisation.
> If you have received this email in error, please notify the sender and delete this message and its attachments.
> As emails may be altered, Orange is not liable for messages that have been modified, changed or falsified.
> Thank you.
> 
> 
> 


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From: <bruno.decraene@orange.com>
To: Tony Przygienda <tonysietf@gmail.com>
CC: "lsr@ietf.org" <lsr@ietf.org>, "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>
Thread-Topic: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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Date: Thu, 23 Apr 2020 17:15:11 +0000
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From: Tony Przygienda <tonysietf@gmail.com>
Date: Thu, 23 Apr 2020 10:28:51 -0700
Message-ID: <CA+wi2hMm=0C9LVy8po2eoYnrTRC6AKawoMJoDoEm5xtbFEvfhw@mail.gmail.com>
To: Bruno Decraene <bruno.decraene@orange.com>
Cc: "lsr@ietf.org" <lsr@ietf.org>,  "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/UaVYRI4AcRdvm3-ELKr2rqBLeYI>
Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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I was refering to RFC4960. Bruno, for all practical purposes I think that
seems to go down the path of trying to reinvent RFC4960 (or ultimately use
it). Or, changing the packet formats heavily to incorporate all the control
loop data you need to the point you have a different control channel along
those lines since you'll find most of the problems RFC4960 is describing
(minus stuff like multiple paths). Nothing wrong with that but it's
ambitious on a 30 years old anitque artefact we're nursing forward here ;-)
As entertaining footnote, I saw in last 20 years at least 3 attempts to
allow multiple TCP sessions in BGP between peers to speed/prioritize things
up. All failed, after the first one I helped to push I smarted up ;-)

As another footnote: I looked @ all the stuff in RIFT (tcp, quic, 4960,
more ephemeral stuff). I ended up adding to rift bunch very rudimentary
things and do roughly what Les/Peter/Acee started to write (modulo algorith
I contributed and bunch things that would be helpful but we can't fit into
existing packet format). This was as much decision as to "what's available
& well debugged" as well as "does it meet requirements" as "how complex is
that vs. rtx in flooding architecture  we have today + some feedback". Not
on powerpoint, in real production code ;-) rift draft shows you the outcome
of that as IMO best trade-off to achieve high flooding speeds ;-)

my 2c

-- tony

On Thu, Apr 23, 2020 at 10:15 AM <bruno.decraene@orange.com> wrote:

> Tony,
>
> Thanks for engaging.
>
> Please inline [Bruno2]
>
>
>
>
>
>
>
> *From:* Tony Przygienda [mailto:tonysietf@gmail.com]
> *Sent:* Wednesday, April 22, 2020 9:25 PM
> *To:* DECRAENE Bruno TGI/OLN
> *Cc:* lsr@ietf.org; Les Ginsberg (ginsberg)
> *Subject:* Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
>
>
>
>
>
>
>
> On Wed, Apr 22, 2020 at 11:03 AM <bruno.decraene@orange.com> wrote:
>
> Tony, all,
>
>
>
> Thanks Tony for the technical and constructive feedback.
>
> Please inline [Bruno]
>
>
>
> *From:* Tony Przygienda [mailto:tonysietf@gmail.com]
> *Sent:* Wednesday, April 22, 2020 1:19 AM
> *To:* Les Ginsberg (ginsberg)
> *Cc:* DECRAENE Bruno TGI/OLN; lsr@ietf.org
> *Subject:* Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
>
>
>
> neither am I aware of anything like this (i.e. per platform/product
> flooding rate constants) in any major vendor stack for whatever that's
> worth. It's simply unmaintanable, point. All major vendors have extensive
> product lines over so many changing hardware configuration/setups it is
> simply not viable to attempt precise measurements (and even then, user
> changing config can throw the stuff off in a millisecond). There may have
> been here and there per deployment scenario some "recommended config"
> (not something I immediately recall either) but that means very fixed
> configuration of things & how they go into networks and even then I'm not
> aware of anyone having had a "precise model of the chain in the box". yes=
,
> probes to measure lots and lots of stuff in the boxes exist but again,
> those are chip/linecard/backplane/chassis/routing engine specific and
> mostly used in complex test/peformance scenarios and not to derive some
> kind of equations that can predict anything much ...
>
> [Bruno] Good points.
>
> Yet, one of the information that we propose to advertise by the LSP
> receiver to the LSP sender is the Receive Window.
>
> -          This is a very common parameter and algorithm. Nothing fancy
> nor reinvented. In particular it=E2=80=99s a parameter used by TCP.
>
> -          I would argue that TCP implementations also run on a variety
> of hardware and systems, must wider range than IS-IS platform. And those
> TCP implementations on all those platform manage to advertise this
> parameter (TCP window)
>
> -          I fail to understand that when some WG contributors proposed
> the use of TCP, nobody said that determining and advertising a Receive
> Window would be an issue, difficult or even impossible. But when we propo=
se
> to advertise a Receive Window in an IS-IS TLV, this becomes difficult or
> even impossible for some platforms. Can anyone help me understand the
> technical difference?
>
>
>
>
>
> Bruno, I was waiting for that ;-)
>
> [Bruno2] Good ;-)
>
>
>
> Discounted for the fact that I'm not a major TCP expert: TCP is a very
> different beast. it has a 100-200msec fast timer & 500msec slow (which ha=
ve
> to be quite accurate, it's really one timer for all connections + mbuf
> and other magic) and it sends a _lot_ of packets back and forth with wind=
ow
> size indications so the negotiation can happen very quickly.  Also, TCP
> can detect losses based on sequence number received contrary to routing
> protocols (that's one of the things we added in RIFT BTW) and it can
> retransmit quickly when it sees a "hole". Contrary to that in ISIS ACKs m=
ay
> or may not come, they may be bundled, hellos may or may not come and we
> can't retransmit stuff on 100msec timers either. It's an utterly differen=
t
> transport channel.
>
> [Bruno2] I would distinguish two things, which I think we have done in
> https://tools.ietf.org/html/draft-decraene-lsr-isis-flooding-speed-03
>
> -          How fast you can adapt the sending rate. This seems mostly
> dependent on the speed of the feedback loop, rather than the format of
> message. E.g. In IS-IS the receiver can give a feedback more or less
> quickly (e.g. depending on how fast/bundled it sends the PSNP). In theory=
,
> I don=E2=80=99t see a major different. From an in implementation standpoi=
nt, I=E2=80=99m
> guessing that the difference is probably bigger (e.g. TCP is probably low=
er
> level/closer to the system/hardware, than IS-IS which is more user space
> and possibly Platform Independent in some organizations))
>
> -          How fast you can detect packet loss. I agree that TCP & IS-IS
> are very different on this. We have proposed to improve this by allowing
> the receiver to advertise to the sender how fast it will ack the LSP.
> Currently the timer/behavior is known to receiver but no to the sender.
> Hence the sender needs to assume the wort case (ISO default).
>
>
>
> In more abstract terms, TCP is a sliding N-window protocol (where N is
> adjusted all the time & losses can be efficiently detected) whereas LSR
> flooding is not a windowing protocol (or rather LSDB-size window protocol
> with selective retransmission but no detection of loss [or only very slow
> based on lack of ACK & CSNPs]). Disadvantage of something like TCP (I
> think I sent out the RFC with UDP control protocol work to make it more T=
CP
> like)
>
> [Bruno2]  If you are referring to DCCP (Datagram Congestion Control
> Protocol) (RFC 4340), yes you did and thank you for this. Constructive
> feedback.
>
> -          Regarding flow control, I=E2=80=99ve quickly looked at DCCP an=
d it
> does not provides flow control.
>
> -          Regarding congestion control, possibly the algorithm part may
> be reused. There are two algo and DCCP is open to others. May be one
> question is how much we want IS-IS to be fair to TCP (control plane TCP,
> not dataplane/user plane TCP). To me, IS-IS is more important than BGP
> traffic, given their relative importance to the network, their delay
> requirements, their typical volume of traffic. But that is probably a
> =E2=80=9Cdetail=E2=80=9D down the road. This is also depends on whether T=
CP & IS-IS compete
> for the same resources (e.g. same queue) or not (ideally TCP and IS-IS ha=
ve
> different queues).
>
>
>
> is that you are stuck when you put something into the pipe, no
> prioritization possible and if receiver is slow you may have multiple
> obsolete copies in the pipe waiting & lots retransmission BW when holes a=
re
> punched into the data through loss. And plain TCP  is actually quite bad
> for control protocol traffic @ scale, almost all vendor run special versi=
on
> of it for BGP for that reason. Why that is is out of scope of this list I
> think ... Flooding is really good to send lots of data prioritized/in
> parallel but on losses re-TX is slow.
>
> [Bruno2] Good that we seem to make the same distinction between the
> control loops for the sending rate vs the retransmission.
>
> Regarding clarifying distinctions, draft may need to better introduce the
> distinction between flow control and congestion control, at least to
> structure the work and the discussion.
>
>
>
> Thanks
>
> --Bruno
>
> Bruno, if you're so deeply interested in that stuff we can talk 1:1
> off-line about implementation work on rift towards adapatable flooding
> rate
>
> [Bruno] Sure. My pleasure. Please propose me some timeslot offline. Pleas=
e
> note that I=E2=80=99m based in Europe (CEST), so a priori during your mor=
ning and
> my evening.
>
> If you can also extend the offer to discuss the implementation work on th=
e
> IS-IS implementation of your employer with regards to adaptable flooding
> rate, and/or how network operator can configure the CLI parameters of the
> LSP senders so as to improve flooding rate without overloading the Junipe=
r
> receiver (possibly depending on the capability of the receiver, its numbe=
r
> of IS-IS neighbors=E2=80=A6 and/or whatever parameter that you feel are r=
elevant)
> that would be most appreciated. And if you believe that the Juniper LSP
> receiver can handle any rate from any reasonable (e.g. 50)  number of IGP
> neighbors, without (significantly) dropping the received LSPs, that would
> be even simpler, please advise.
>
>
>
>
>
>
>
> ping me for that 1:1 on company email pls
>
>
>
> -- tony
>
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Content-Type: text/html; charset="UTF-8"
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<div dir=3D"ltr"><div>I was refering to RFC4960. Bruno, for all practical p=
urposes I think that seems to go down the path of trying to reinvent RFC496=
0 (or ultimately use it). Or, changing the packet formats heavily to incorp=
orate all the control loop data you need to the point you have a different =
control channel along those lines since you&#39;ll find most of the problem=
s RFC4960 is describing (minus stuff like multiple paths). Nothing wrong wi=
th that but it&#39;s ambitious on a 30 years old anitque artefact we&#39;re=
 nursing forward here ;-) As entertaining footnote, I saw in last 20 years =
at least 3 attempts to allow multiple TCP sessions in BGP between peers to =
speed/prioritize things up. All failed, after the first one I helped to pus=
h I smarted up ;-) <br></div><div><br></div><div>As another footnote: I loo=
ked @ all the stuff in RIFT (tcp, quic, 4960, more ephemeral stuff). I ende=
d up adding to rift bunch very rudimentary things and do roughly what Les/P=
eter/Acee started to write (modulo algorith I contributed and bunch things =
that would be helpful but we can&#39;t fit into existing packet format). Th=
is was as much decision as to &quot;what&#39;s available &amp; well debugge=
d&quot; as well as &quot;does it meet requirements&quot; as &quot;how compl=
ex is that vs. rtx in flooding architecture=C2=A0 we have today + some feed=
back&quot;. Not on powerpoint, in real production code ;-) rift draft shows=
 you the outcome of that as IMO best trade-off to achieve high flooding spe=
eds ;-) <br></div><div><br></div><div>my 2c<br></div><div><br></div><div>--=
 tony <br></div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=
=3D"gmail_attr">On Thu, Apr 23, 2020 at 10:15 AM &lt;<a href=3D"mailto:brun=
o.decraene@orange.com">bruno.decraene@orange.com</a>&gt; wrote:<br></div><b=
lockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-le=
ft:1px solid rgb(204,204,204);padding-left:1ex">







<div lang=3D"FR">
<div class=3D"gmail-m_-1757288230754630308WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,&quot;sans-serif&quot;;color:rgb(31,73,125)">Tony,<u></u><u></u><=
/span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">
<span style=3D"font-size:11pt;font-family:&quot;Calibri&quot;,&quot;sans-se=
rif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">Thanks for engaging.<u></u><=
u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">
<span style=3D"font-size:11pt;font-family:&quot;Calibri&quot;,&quot;sans-se=
rif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">Please inline [Bruno2]</span=
><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,&quot;sans-serif&quot;;color:rgb(31,73,125)" lang=3D"EN-US"><u></=
u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,&quot;sans-serif&quot;;color:rgb(31,73,125)" lang=3D"EN-US"><u></=
u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:&quot;Cali=
bri&quot;,&quot;sans-serif&quot;;color:rgb(31,73,125)" lang=3D"EN-US"><u></=
u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><b><span style=3D"font-=
size:10pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;">From:</spa=
n></b><span style=3D"font-size:10pt;font-family:&quot;Tahoma&quot;,&quot;sa=
ns-serif&quot;">
 Tony Przygienda [mailto:<a href=3D"mailto:tonysietf@gmail.com" target=3D"_=
blank">tonysietf@gmail.com</a>] <br>
<b>Sent:</b> Wednesday, April 22, 2020 9:25 PM<br>
<b>To:</b> DECRAENE Bruno TGI/OLN<br>
<b>Cc:</b> <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</=
a>; Les Ginsberg (ginsberg)<br>
<b>Subject:</b> Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed<=
u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">On Wed, Apr 22, 2020 at=
 11:03 AM &lt;<a href=3D"mailto:bruno.decraene@orange.com" target=3D"_blank=
">bruno.decraene@orange.com</a>&gt; wrote:<u></u><u></u></p>
</div>
<blockquote style=3D"border-color:currentcolor currentcolor currentcolor rg=
b(204,204,204);border-style:none none none solid;border-width:medium medium=
 medium 1pt;padding:0cm 0cm 0cm 6pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">
<span style=3D"font-size:11pt;font-family:&quot;Calibri&quot;,&quot;sans-se=
rif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">Tony, all,</span><u></u><u><=
/u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">
<span style=3D"font-size:11pt;font-family:&quot;Calibri&quot;,&quot;sans-se=
rif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">=C2=A0</span><u></u><u></u><=
/p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">
<span style=3D"font-size:11pt;font-family:&quot;Calibri&quot;,&quot;sans-se=
rif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">Thanks Tony for the technica=
l and constructive feedback.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">
<span style=3D"font-size:11pt;font-family:&quot;Calibri&quot;,&quot;sans-se=
rif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">Please inline [Bruno]</span>=
<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">
<span style=3D"font-size:11pt;font-family:&quot;Calibri&quot;,&quot;sans-se=
rif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">=C2=A0</span><u></u><u></u><=
/p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<b><span style=3D"font-size:10pt;font-family:&quot;Tahoma&quot;,&quot;sans-=
serif&quot;" lang=3D"EN-US">From:</span></b><span style=3D"font-size:10pt;f=
ont-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;" lang=3D"EN-US"> Tony =
Przygienda [mailto:<a href=3D"mailto:tonysietf@gmail.com" target=3D"_blank"=
>tonysietf@gmail.com</a>]
<br>
<b>Sent:</b> Wednesday, April 22, 2020 1:19 AM<br>
<b>To:</b> Les Ginsberg (ginsberg)<br>
<b>Cc:</b> DECRAENE Bruno TGI/OLN; <a href=3D"mailto:lsr@ietf.org" target=
=3D"_blank">
lsr@ietf.org</a><br>
<b>Subject:</b> Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed<=
/span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US">=C2=A0</span><u></u><u></u></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US">neither am I aware of anything like this (i.e. per pla=
tform/product flooding rate constants) in any major vendor stack for whatev=
er that&#39;s worth. It&#39;s simply
<span class=3D"gmail-m_-1757288230754630308gmail-m2484166253138266685spelle=
">unmaintanable</span>, point. All major vendors have extensive product lin=
es over so many changing hardware configuration/setups it is simply not via=
ble to attempt precise measurements (and even then, user changing
<span class=3D"gmail-m_-1757288230754630308gmail-m2484166253138266685spelle=
">config</span> can throw the stuff off in a millisecond). There may have b=
een here and there per deployment scenario some &quot;recommended
<span class=3D"gmail-m_-1757288230754630308gmail-m2484166253138266685spelle=
">config</span>&quot; (not something I immediately recall either) but that =
means very fixed configuration of things &amp; how they go into networks an=
d even then I&#39;m not aware of anyone having had a &quot;precise model of=
 the
 chain in the box&quot;. yes, probes to measure lots and lots of stuff in t=
he boxes exist but again, those are chip/<span class=3D"gmail-m_-1757288230=
754630308gmail-m2484166253138266685spelle">linecard</span>/backplane/chassi=
s/routing engine specific and mostly used in complex test/<span class=3D"gm=
ail-m_-1757288230754630308gmail-m2484166253138266685spelle">peformance</spa=
n>
 scenarios and not to derive some kind of equations that can predict anythi=
ng much ...
</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">
<span style=3D"font-size:11pt;font-family:&quot;Calibri&quot;,&quot;sans-se=
rif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">[Bruno] Good points.</span><=
u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">
<span style=3D"font-size:11pt;font-family:&quot;Calibri&quot;,&quot;sans-se=
rif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">Yet, one of the information =
that we propose to advertise by the LSP receiver to the LSP sender is the R=
eceive Window.</span><u></u><u></u></p>
<p class=3D"gmail-m_-1757288230754630308gmail-m2484166253138266685msolistpa=
ragraph" style=3D"margin-left:35.4pt">
<span style=3D"font-size:11pt;font-family:&quot;Calibri&quot;,&quot;sans-se=
rif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">-</span><span style=3D"font-=
size:7pt;color:rgb(31,73,125)" lang=3D"EN-US">=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span><span style=3D"font-size:11pt;font-family:&quot;Calibri&quot;,&quot;=
sans-serif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">This is a very common=
 parameter and algorithm. Nothing fancy nor reinvented. In particular it=E2=
=80=99s a parameter used by TCP.</span><u></u><u></u></p>
<p class=3D"gmail-m_-1757288230754630308gmail-m2484166253138266685msolistpa=
ragraph" style=3D"margin-left:35.4pt">
<span style=3D"font-size:11pt;font-family:&quot;Calibri&quot;,&quot;sans-se=
rif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">-</span><span style=3D"font-=
size:7pt;color:rgb(31,73,125)" lang=3D"EN-US">=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span><span style=3D"font-size:11pt;font-family:&quot;Calibri&quot;,&quot;=
sans-serif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">I would argue that TC=
P implementations also run on a variety of hardware and systems, must wider=
 range than IS-IS platform. And those
 TCP implementations on all those platform manage to advertise this paramet=
er (TCP window)</span><u></u><u></u></p>
<p class=3D"gmail-m_-1757288230754630308gmail-m2484166253138266685msolistpa=
ragraph" style=3D"margin-left:35.4pt">
<span style=3D"font-size:11pt;font-family:&quot;Calibri&quot;,&quot;sans-se=
rif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">-</span><span style=3D"font-=
size:7pt;color:rgb(31,73,125)" lang=3D"EN-US">=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span><span style=3D"font-size:11pt;font-family:&quot;Calibri&quot;,&quot;=
sans-serif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">I fail to understand =
that when some WG contributors proposed the use of TCP, nobody said that de=
termining and advertising a Receive Window
 would be an issue, difficult or even impossible. But when we propose to ad=
vertise a Receive Window in an IS-IS TLV, this becomes difficult or even im=
possible for some platforms. Can anyone help me understand the technical di=
fference?</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US">=C2=A0</span><u></u><u></u></p>
</div>
</div>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">Bruno, I was waiting fo=
r that ;-)<span style=3D"color:rgb(31,73,125)"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:35.4pt"><span style=3D"font-siz=
e:11pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:rgb(31,=
73,125)" lang=3D"EN-US">[Bruno2] Good ;-)<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:35.4pt"><span style=3D"font-siz=
e:11pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:rgb(31,=
73,125)" lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US">Di=
scounted for the fact that I&#39;m not a major TCP expert: TCP is a very di=
fferent beast. it has a 100-200msec fast timer &amp; 500msec slow (which ha=
ve to be quite
 accurate, it&#39;s really one timer for all connections=C2=A0+ <span class=
=3D"gmail-m_-1757288230754630308SpellE">mbuf</span> and other magic) and it=
 sends a _lot_ of packets back and forth with window size indications so th=
e negotiation can happen very quickly.=C2=A0
</span><span class=3D"gmail-m_-1757288230754630308SpellE">Also</span>, TCP =
<span class=3D"gmail-m_-1757288230754630308SpellE">can</span> <span class=
=3D"gmail-m_-1757288230754630308SpellE">
detect</span> losses based on sequence number received contrary to routing =
protocols (that&#39;s one of the things we added in RIFT BTW) and it can re=
transmit quickly when it sees a &quot;hole&quot;. Contrary to that in ISIS =
ACKs may or may not come, they may be bundled,
 hellos may or may not come and we can&#39;t retransmit stuff on 100msec ti=
mers either. It&#39;s an utterly different transport channel.
<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"text-indent:35.4pt"><span style=3D"font-siz=
e:11pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:rgb(31,=
73,125)" lang=3D"EN-US">[Bruno2] I would distinguish two things, which I th=
ink
 we have done in <a href=3D"https://tools.ietf.org/html/draft-decraene-lsr-=
isis-flooding-speed-03" target=3D"_blank">
https://tools.ietf.org/html/draft-decraene-lsr-isis-flooding-speed-03</a><u=
></u><u></u></span></p>
<p class=3D"gmail-m_-1757288230754630308MsoListParagraph" style=3D"margin-l=
eft:53.4pt">
<u></u><span style=3D"font-size:11pt;font-family:&quot;Calibri&quot;,&quot;=
sans-serif&quot;;color:rgb(31,73,125)" lang=3D"EN-US"><span>-<span style=3D=
"font:7pt &quot;Times New Roman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span style=3D"font-size:11pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">=
How fast you can adapt the sending rate. This seems mostly dependent on
 the speed of the feedback loop, rather than the format of message. E.g. In=
 IS-IS the receiver can give a feedback more or less quickly (e.g. dependin=
g on how fast/bundled it sends the PSNP). In theory, I don=E2=80=99t see a =
major different. From an in implementation
 standpoint, I=E2=80=99m guessing that the difference is probably bigger (e=
.g. TCP is probably lower level/closer to the system/hardware, than IS-IS w=
hich is more user space and possibly Platform Independent in some organizat=
ions))<u></u><u></u></span></p>
<p class=3D"gmail-m_-1757288230754630308MsoListParagraph" style=3D"margin-l=
eft:53.4pt">
<u></u><span style=3D"font-size:11pt;font-family:&quot;Calibri&quot;,&quot;=
sans-serif&quot;;color:rgb(31,73,125)" lang=3D"EN-US"><span>-<span style=3D=
"font:7pt &quot;Times New Roman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span style=3D"font-size:11pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">=
How fast you can detect packet loss. I agree that TCP &amp; IS-IS are very
 different on this. We have proposed to improve this by allowing the receiv=
er to advertise to the sender how fast it will
<span class=3D"gmail-m_-1757288230754630308SpellE">ack</span> the LSP. Curr=
ently the timer/behavior is known to receiver but no to the sender. Hence t=
he sender needs to assume the wort case (ISO default).<u></u><u></u></span>=
</p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"><u=
></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US">In=
 more abstract terms, TCP is a sliding N-window
</span><span class=3D"gmail-m_-1757288230754630308SpellE">protocol</span> (=
<span class=3D"gmail-m_-1757288230754630308SpellE">where</span> N <span cla=
ss=3D"gmail-m_-1757288230754630308SpellE">
is</span> <span class=3D"gmail-m_-1757288230754630308SpellE">adjusted</span=
> all the time &amp; <span class=3D"gmail-m_-1757288230754630308SpellE">
losses</span> <span class=3D"gmail-m_-1757288230754630308SpellE">can</span>=
 <span class=3D"gmail-m_-1757288230754630308SpellE">be</span> <span class=
=3D"gmail-m_-1757288230754630308SpellE">
efficiently</span> <span class=3D"gmail-m_-1757288230754630308SpellE">detec=
ted</span>) <span class=3D"gmail-m_-1757288230754630308SpellE">whereas</spa=
n> LSR
<span class=3D"gmail-m_-1757288230754630308SpellE">flooding</span> <span cl=
ass=3D"gmail-m_-1757288230754630308SpellE">is</span> not a <span class=3D"g=
mail-m_-1757288230754630308SpellE">
windowing</span> <span class=3D"gmail-m_-1757288230754630308SpellE">protoco=
l</span> (or <span class=3D"gmail-m_-1757288230754630308SpellE">rather</spa=
n> LSDB-size
<span class=3D"gmail-m_-1757288230754630308SpellE">window</span> <span clas=
s=3D"gmail-m_-1757288230754630308SpellE">protocol</span> <span class=3D"gma=
il-m_-1757288230754630308SpellE">
with</span> <span class=3D"gmail-m_-1757288230754630308SpellE">selective</s=
pan> retransmission but no <span class=3D"gmail-m_-1757288230754630308Spell=
E">
detection</span> of <span class=3D"gmail-m_-1757288230754630308SpellE">loss=
</span> [or <span class=3D"gmail-m_-1757288230754630308SpellE">only</span>
<span class=3D"gmail-m_-1757288230754630308SpellE">very</span> slow <span c=
lass=3D"gmail-m_-1757288230754630308SpellE">based</span> on <span class=3D"=
gmail-m_-1757288230754630308SpellE">
lack</span> of ACK &amp; <span class=3D"gmail-m_-1757288230754630308SpellE"=
>CSNPs</span>]). Disadvantage of something like TCP (I think I sent out the=
 RFC with UDP control protocol work to make it more TCP like)
<span style=3D"color:rgb(31,73,125)"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:35.4pt"><span style=3D"font-siz=
e:11pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:rgb(31,=
73,125)" lang=3D"EN-US">[Bruno2]
<span>=C2=A0</span>If you are referring to DCCP (Datagram Congestion Contro=
l Protocol) (RFC 4340), yes you did and thank you for this. Constructive fe=
edback.<u></u><u></u></span></p>
<p class=3D"gmail-m_-1757288230754630308MsoListParagraph" style=3D"margin-l=
eft:53.4pt">
<u></u><span style=3D"font-size:11pt;font-family:&quot;Calibri&quot;,&quot;=
sans-serif&quot;;color:rgb(31,73,125)" lang=3D"EN-US"><span>-<span style=3D=
"font:7pt &quot;Times New Roman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span style=3D"font-size:11pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">=
Regarding flow control, I=E2=80=99ve quickly looked at DCCP and it does not=
 provides
 flow control.<u></u><u></u></span></p>
<p class=3D"gmail-m_-1757288230754630308MsoListParagraph" style=3D"margin-l=
eft:53.4pt">
<u></u><span style=3D"font-size:11pt;font-family:&quot;Calibri&quot;,&quot;=
sans-serif&quot;;color:rgb(31,73,125)" lang=3D"EN-US"><span>-<span style=3D=
"font:7pt &quot;Times New Roman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span style=3D"font-size:11pt;font-family:&quot=
;Calibri&quot;,&quot;sans-serif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">=
Regarding congestion control, possibly the algorithm part may be reused.
 There are two <span class=3D"gmail-m_-1757288230754630308SpellE">algo</spa=
n> and DCCP is open to others. May be one question is how much we want IS-I=
S to be fair to TCP (control plane TCP, not
<span class=3D"gmail-m_-1757288230754630308SpellE">dataplane</span>/user pl=
ane TCP). To me, IS-IS is more important than BGP traffic, given their rela=
tive importance to the network, their delay requirements, their typical vol=
ume of traffic. But that is probably a =E2=80=9Cdetail=E2=80=9D down the ro=
ad.
 This is also depends on whether TCP &amp; IS-IS compete for the same resou=
rces (e.g. same queue) or not (ideally TCP and IS-IS have different queues)=
.<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:35.4pt"><span style=3D"font-siz=
e:11pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:rgb(31,=
73,125)" lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US">is=
 that you are stuck when you put something into the pipe, no prioritization=
 possible and if receiver is slow you may have multiple obsolete copies in =
the pipe
 waiting &amp; lots retransmission BW when holes are punched into the data =
through loss.
</span>And plain TCP=C2=A0 <span class=3D"gmail-m_-1757288230754630308Spell=
E">is</span> actually quite bad for control protocol traffic @ scale, almos=
t all vendor run special version of it for BGP for that reason. Why that is=
 is out of scope of this list I think ... Flooding is really good to
 send lots of data prioritized/in parallel but on <span class=3D"gmail-m_-1=
757288230754630308SpellE">losses</span>
<span class=3D"gmail-m_-1757288230754630308SpellE">re</span>-TX <span class=
=3D"gmail-m_-1757288230754630308SpellE">is</span> slow.<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"text-indent:35.4pt"><b><i><span style=3D"fo=
nt-size:11pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:r=
gb(31,73,125)"></span></i></b><span style=3D"font-size:11pt;font-family:&qu=
ot;Calibri&quot;,&quot;sans-serif&quot;;color:rgb(31,73,125)" lang=3D"EN-US=
">[Bruno2]
 Good that we seem to make the same distinction between the control loops f=
or the sending rate vs the retransmission.<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:35.4pt"><span style=3D"font-siz=
e:11pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:rgb(31,=
73,125)" lang=3D"EN-US">Regarding clarifying distinctions, draft may need t=
o
 better introduce the distinction between flow control and congestion contr=
ol, at least to structure the work and the discussion.<u></u><u></u></span>=
</p>
<p class=3D"MsoNormal" style=3D"text-indent:35.4pt"><span style=3D"font-siz=
e:11pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:rgb(31,=
73,125)" lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:35.4pt"><span style=3D"font-siz=
e:11pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:rgb(31,=
73,125)" lang=3D"EN-US">Thanks<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:35.4pt"><span style=3D"font-siz=
e:11pt;font-family:&quot;Calibri&quot;,&quot;sans-serif&quot;;color:rgb(31,=
73,125)" lang=3D"EN-US">--Bruno<u></u><u></u></span></p>
</div>
<blockquote style=3D"border-color:currentcolor currentcolor currentcolor rg=
b(204,204,204);border-style:none none none solid;border-width:medium medium=
 medium 1pt;padding:0cm 0cm 0cm 6pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US">Bruno, if you&#39;re so deeply interested in that stuf=
f we can talk 1:1 off-line about implementation work on rift towards
<span class=3D"gmail-m_-1757288230754630308SpellE"><span class=3D"gmail-m_-=
1757288230754630308gmail-m2484166253138266685spelle">adapatable</span></spa=
n> flooding rate<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">
<span style=3D"font-size:11pt;font-family:&quot;Calibri&quot;,&quot;sans-se=
rif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">[Bruno] Sure. My pleasure. P=
lease propose me some timeslot offline. Please note that I=E2=80=99m based =
in Europe (CEST), so a priori during your morning
 and my evening.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">
<span style=3D"font-size:11pt;font-family:&quot;Calibri&quot;,&quot;sans-se=
rif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">If you can also extend the o=
ffer to discuss the implementation work on the IS-IS implementation of your=
 employer with regards to adaptable flooding
 rate, and/or how network operator can configure the CLI parameters of the =
LSP senders so as to improve flooding rate without overloading the Juniper =
receiver (possibly depending on the capability of the receiver, its number =
of IS-IS neighbors=E2=80=A6 and/or whatever
 parameter that you feel are relevant) that would be most appreciated. And =
if you believe that the Juniper LSP receiver can handle any rate from any r=
easonable (e.g. 50) =C2=A0number of IGP neighbors, without (significantly) =
dropping the received LSPs, that would
 be even simpler, please advise.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">
<span style=3D"font-size:11pt;font-family:&quot;Calibri&quot;,&quot;sans-se=
rif&quot;;color:rgb(31,73,125)" lang=3D"EN-US">=C2=A0</span><u></u><u></u><=
/p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US">=C2=A0</span><u></u><u></u></p>
</div>
</div>
</div>
</div>
</blockquote>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">ping me for that 1:1 on=
 company email pls
<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">-- tony <u></u><u></u><=
/p>
</div>
</div>
</div>
<pre>______________________________________________________________________=
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</pre></div>

</blockquote></div>

--000000000000f4dbd305a3f8989a--


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Reviewer: Mohit Sethi
Review result: Ready with Nits

I am the assigned Gen-ART reviewer for this draft. The General Area
Review Team (Gen-ART) reviews all IETF documents being processed
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Document: draft-ietf-isis-mpls-elc-11
Reviewer: Mohit Sethi
Review Date: 2020-04-24
IETF LC End Date: 2020-05-05
IESG Telechat date: Not scheduled for a telechat

Summary: This document specifies how Entropy Label Capability (ELC) and Entropy
Readable Label Depth (ERLD) are advertised using IS-IS. For advertising ELC, a
flag in the Prefix Attribute Flags is used. For advertising ERLD, a Node MSD
Advertisement is used.

Major issues:

Minor issues: The document is short and straightforward. For someone like me
who is not familiar with the routing area, would it make sense to explain why
signalling ELC information with MPLS is not sufficient (or what are the
benefits of advertising with IS-IS)?

Nits/editorial comments:

In section 3, "used as the ECL  Flag" should perhaps be "used as the ELC Flag"?
In section 4, "IANA for EARLD-MSD" should perhaps be "IANA for ERLD-MSD"?
In section 6, "ECL Flag (E-flag)." should perhaps be "ELC Flag (E-flag)."?



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To: Tony Przygienda <tonysietf@gmail.com>
CC: "lsr@ietf.org" <lsr@ietf.org>, "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>
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Date: Fri, 24 Apr 2020 09:25:22 +0000
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From: Robert Raszuk <robert@raszuk.net>
Date: Fri, 24 Apr 2020 12:41:39 +0200
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To: Bruno Decraene <bruno.decraene@orange.com>
Cc: Tony Przygienda <tonysietf@gmail.com>,  "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>, "lsr@ietf.org" <lsr@ietf.org>
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Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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Hi Bruno  & all,

[Bruno] On my side, I=E2=80=99ll try once and I think the LSR WG should als=
o try to
improve IS-IS performance. May be if we want to move, we should first
release the brakes.

Well from my observations releasing the breaks means increasing the risks.

Take BGP - breaks are off and see what happens :)

My personal observation is that ISIS implementations across vendors are
just fine for vast majority of deployments today. That actually also
includes vast majority of compute clusters as they consists of max 10s of
racks.

Of course there are larger clusters with 1000+ or 10K and above network
elements itself and x 20 L3 computes, but is there really a need to stretch
protocol to accommodate those ? Those usually run BGP anyway. And also
there is DV+LS hybrid too now.

ISIS flooding churn (and room for optimization) becomes a problem when node
boots up (IMHO this is not a problem) and when node fails while having many
neighbors attached. Yes maybe second case could be improved but well
designed and operated network should have pre-programmed bypass paths
against such cases so IMO stressing IGP to "converge" faster while great in
principle may not be really needed in practice.

Last I am worried that when IETF defines changes to core protocol behaviour
the quality of the implementations of those changes may really differ
across vendors overall resulting in much worse performance and stability as
compared to where we are today.

I am just not sure if possible gains for few deployments are greater
then risk for 1000s of today's deployments. Maybe one size does not fit all
and for massive scale ISIS we should define a notion of "ISIS-DC-PLUGIN"
which can be optionally in run time added when/if needed. If that requires
protocol changes to accommodate such dynamic plugins - that work should
take place.

Many thx,
R.

PS. Does anyone have a pointer to any real data showing that performance of
real life WAN ISIS deployments is bad ?


On Fri, Apr 24, 2020 at 11:26 AM <bruno.decraene@orange.com> wrote:

> Tony
>
>
>
> *From:* Tony Przygienda [mailto:tonysietf@gmail.com]
> *Sent:* Thursday, April 23, 2020 7:29 PM
> *To:* DECRAENE Bruno TGI/OLN
> *Cc:* lsr@ietf.org; Les Ginsberg (ginsberg)
> *Subject:* Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
>
>
>
> I was refering to RFC4960. Bruno, for all practical purposes I think that
> seems to go down the path of trying to reinvent RFC4960 (or ultimately us=
e
> it).
>
> [Bruno] I don=E2=80=99t think that SCTP (RC4960) is a better fit than TCP=
. Many
> more features and options than TCP, way more than needed given existing
> IS-IS flooding mechanism. Much less implementations experience and
> improvement than TCP.
>
> Or, changing the packet formats heavily to incorporate all the control
> loop data you need to the point you have a different control channel alon=
g
> those lines since you'll find most of the problems RFC4960 is describing
> (minus stuff like multiple paths).
>
> [Bruno] Really, adding one sub-TLV in IS-IS is not =E2=80=9Cchanging the =
packet
> formats heavily=E2=80=9D.
>
> Nothing wrong with that but it's ambitious on a 30 years old anitque
> artefact we're nursing forward here ;-)
>
> [Bruno] I=E2=80=99m perfectly fine with revolution approaches. I think th=
at we can
> also provide incremental improvement to IS-IS.
>
> As entertaining footnote, I saw in last 20 years at least 3 attempts to
> allow multiple TCP sessions in BGP between peers to speed/prioritize thin=
gs
> up. All failed, after the first one I helped to push I smarted up ;-)
>
>  [Bruno] On my side, I=E2=80=99ll try once and I think the LSR WG should =
also try
> to improve IS-IS performance. May be if we want to move, we should first
> release the brakes. I=E2=80=99m seen some progress, e.g., from =E2=80=9Ct=
here is no need to
> improve flooding=E2=80=9D to =E2=80=9Cwe all agree to improve flooding=E2=
=80=9D, or from =E2=80=9CNetwork
> operator just need to configure existing CLI=E2=80=9D to =E2=80=9CWe agre=
e that we need
> something more automated/dynamic=E2=80=9D. But this has been very slow pr=
ogress
> over a year.
>
>
>
> --Bruno
>
>
>
> As another footnote: I looked @ all the stuff in RIFT (tcp, quic, 4960,
> more ephemeral stuff). I ended up adding to rift bunch very rudimentary
> things and do roughly what Les/Peter/Acee started to write (modulo algori=
th
> I contributed and bunch things that would be helpful but we can't fit int=
o
> existing packet format). This was as much decision as to "what's availabl=
e
> & well debugged" as well as "does it meet requirements" as "how complex i=
s
> that vs. rtx in flooding architecture  we have today + some feedback". No=
t
> on powerpoint, in real production code ;-) rift draft shows you the outco=
me
> of that as IMO best trade-off to achieve high flooding speeds ;-)
>
>
>
> my 2c
>
>
>
> -- tony
>
>
>
> On Thu, Apr 23, 2020 at 10:15 AM <bruno.decraene@orange.com> wrote:
>
> Tony,
>
> Thanks for engaging.
>
> Please inline [Bruno2]
>
>
>
>
>
>
>
> *From:* Tony Przygienda [mailto:tonysietf@gmail.com]
> *Sent:* Wednesday, April 22, 2020 9:25 PM
> *To:* DECRAENE Bruno TGI/OLN
> *Cc:* lsr@ietf.org; Les Ginsberg (ginsberg)
> *Subject:* Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
>
>
>
>
>
>
>
> On Wed, Apr 22, 2020 at 11:03 AM <bruno.decraene@orange.com> wrote:
>
> Tony, all,
>
>
>
> Thanks Tony for the technical and constructive feedback.
>
> Please inline [Bruno]
>
>
>
> *From:* Tony Przygienda [mailto:tonysietf@gmail.com]
> *Sent:* Wednesday, April 22, 2020 1:19 AM
> *To:* Les Ginsberg (ginsberg)
> *Cc:* DECRAENE Bruno TGI/OLN; lsr@ietf.org
> *Subject:* Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
>
>
>
> neither am I aware of anything like this (i.e. per platform/product
> flooding rate constants) in any major vendor stack for whatever that's
> worth. It's simply unmaintanable, point. All major vendors have extensive
> product lines over so many changing hardware configuration/setups it is
> simply not viable to attempt precise measurements (and even then, user
> changing config can throw the stuff off in a millisecond). There may have
> been here and there per deployment scenario some "recommended config"
> (not something I immediately recall either) but that means very fixed
> configuration of things & how they go into networks and even then I'm not
> aware of anyone having had a "precise model of the chain in the box". yes=
,
> probes to measure lots and lots of stuff in the boxes exist but again,
> those are chip/linecard/backplane/chassis/routing engine specific and
> mostly used in complex test/peformance scenarios and not to derive some
> kind of equations that can predict anything much ...
>
> [Bruno] Good points.
>
> Yet, one of the information that we propose to advertise by the LSP
> receiver to the LSP sender is the Receive Window.
>
> -          This is a very common parameter and algorithm. Nothing fancy
> nor reinvented. In particular it=E2=80=99s a parameter used by TCP.
>
> -          I would argue that TCP implementations also run on a variety
> of hardware and systems, must wider range than IS-IS platform. And those
> TCP implementations on all those platform manage to advertise this
> parameter (TCP window)
>
> -          I fail to understand that when some WG contributors proposed
> the use of TCP, nobody said that determining and advertising a Receive
> Window would be an issue, difficult or even impossible. But when we propo=
se
> to advertise a Receive Window in an IS-IS TLV, this becomes difficult or
> even impossible for some platforms. Can anyone help me understand the
> technical difference?
>
>
>
>
>
> Bruno, I was waiting for that ;-)
>
> [Bruno2] Good ;-)
>
>
>
> Discounted for the fact that I'm not a major TCP expert: TCP is a very
> different beast. it has a 100-200msec fast timer & 500msec slow (which ha=
ve
> to be quite accurate, it's really one timer for all connections + mbuf
> and other magic) and it sends a _lot_ of packets back and forth with wind=
ow
> size indications so the negotiation can happen very quickly.  Also, TCP
> can detect losses based on sequence number received contrary to routing
> protocols (that's one of the things we added in RIFT BTW) and it can
> retransmit quickly when it sees a "hole". Contrary to that in ISIS ACKs m=
ay
> or may not come, they may be bundled, hellos may or may not come and we
> can't retransmit stuff on 100msec timers either. It's an utterly differen=
t
> transport channel.
>
> [Bruno2] I would distinguish two things, which I think we have done in
> https://tools.ietf.org/html/draft-decraene-lsr-isis-flooding-speed-03
>
> -          How fast you can adapt the sending rate. This seems mostly
> dependent on the speed of the feedback loop, rather than the format of
> message. E.g. In IS-IS the receiver can give a feedback more or less
> quickly (e.g. depending on how fast/bundled it sends the PSNP). In theory=
,
> I don=E2=80=99t see a major different. From an in implementation standpoi=
nt, I=E2=80=99m
> guessing that the difference is probably bigger (e.g. TCP is probably low=
er
> level/closer to the system/hardware, than IS-IS which is more user space
> and possibly Platform Independent in some organizations))
>
> -          How fast you can detect packet loss. I agree that TCP & IS-IS
> are very different on this. We have proposed to improve this by allowing
> the receiver to advertise to the sender how fast it will ack the LSP.
> Currently the timer/behavior is known to receiver but no to the sender.
> Hence the sender needs to assume the wort case (ISO default).
>
>
>
> In more abstract terms, TCP is a sliding N-window protocol (where N is
> adjusted all the time & losses can be efficiently detected) whereas LSR
> flooding is not a windowing protocol (or rather LSDB-size window protocol
> with selective retransmission but no detection of loss [or only very slow
> based on lack of ACK & CSNPs]). Disadvantage of something like TCP (I
> think I sent out the RFC with UDP control protocol work to make it more T=
CP
> like)
>
> [Bruno2]  If you are referring to DCCP (Datagram Congestion Control
> Protocol) (RFC 4340), yes you did and thank you for this. Constructive
> feedback.
>
> -          Regarding flow control, I=E2=80=99ve quickly looked at DCCP an=
d it
> does not provides flow control.
>
> -          Regarding congestion control, possibly the algorithm part may
> be reused. There are two algo and DCCP is open to others. May be one
> question is how much we want IS-IS to be fair to TCP (control plane TCP,
> not dataplane/user plane TCP). To me, IS-IS is more important than BGP
> traffic, given their relative importance to the network, their delay
> requirements, their typical volume of traffic. But that is probably a
> =E2=80=9Cdetail=E2=80=9D down the road. This is also depends on whether T=
CP & IS-IS compete
> for the same resources (e.g. same queue) or not (ideally TCP and IS-IS ha=
ve
> different queues).
>
>
>
> is that you are stuck when you put something into the pipe, no
> prioritization possible and if receiver is slow you may have multiple
> obsolete copies in the pipe waiting & lots retransmission BW when holes a=
re
> punched into the data through loss. And plain TCP  is actually quite bad
> for control protocol traffic @ scale, almost all vendor run special versi=
on
> of it for BGP for that reason. Why that is is out of scope of this list I
> think ... Flooding is really good to send lots of data prioritized/in
> parallel but on losses re-TX is slow.
>
> [Bruno2] Good that we seem to make the same distinction between the
> control loops for the sending rate vs the retransmission.
>
> Regarding clarifying distinctions, draft may need to better introduce the
> distinction between flow control and congestion control, at least to
> structure the work and the discussion.
>
>
>
> Thanks
>
> --Bruno
>
> Bruno, if you're so deeply interested in that stuff we can talk 1:1
> off-line about implementation work on rift towards adapatable flooding
> rate
>
> [Bruno] Sure. My pleasure. Please propose me some timeslot offline. Pleas=
e
> note that I=E2=80=99m based in Europe (CEST), so a priori during your mor=
ning and
> my evening.
>
> If you can also extend the offer to discuss the implementation work on th=
e
> IS-IS implementation of your employer with regards to adaptable flooding
> rate, and/or how network operator can configure the CLI parameters of the
> LSP senders so as to improve flooding rate without overloading the Junipe=
r
> receiver (possibly depending on the capability of the receiver, its numbe=
r
> of IS-IS neighbors=E2=80=A6 and/or whatever parameter that you feel are r=
elevant)
> that would be most appreciated. And if you believe that the Juniper LSP
> receiver can handle any rate from any reasonable (e.g. 50)  number of IGP
> neighbors, without (significantly) dropping the received LSPs, that would
> be even simpler, please advise.
>
>
>
>
>
>
>
> ping me for that 1:1 on company email pls
>
>
>
> -- tony
>
> _________________________________________________________________________=
________________________________________________
>
>
>
> Ce message et ses pieces jointes peuvent contenir des informations confid=
entielles ou privilegiees et ne doivent donc
>
> pas etre diffuses, exploites ou copies sans autorisation. Si vous avez re=
cu ce message par erreur, veuillez le signaler
>
> a l'expediteur et le detruire ainsi que les pieces jointes. Les messages =
electroniques etant susceptibles d'alteration,
>
> Orange decline toute responsabilite si ce message a ete altere, deforme o=
u falsifie. Merci.
>
>
>
> This message and its attachments may contain confidential or privileged i=
nformation that may be protected by law;
>
> they should not be distributed, used or copied without authorisation.
>
> If you have received this email in error, please notify the sender and de=
lete this message and its attachments.
>
> As emails may be altered, Orange is not liable for messages that have bee=
n modified, changed or falsified.
>
> Thank you.
>
> _________________________________________________________________________=
________________________________________________
>
> Ce message et ses pieces jointes peuvent contenir des informations confid=
entielles ou privilegiees et ne doivent donc
> pas etre diffuses, exploites ou copies sans autorisation. Si vous avez re=
cu ce message par erreur, veuillez le signaler
> a l'expediteur et le detruire ainsi que les pieces jointes. Les messages =
electroniques etant susceptibles d'alteration,
> Orange decline toute responsabilite si ce message a ete altere, deforme o=
u falsifie. Merci.
>
> This message and its attachments may contain confidential or privileged i=
nformation that may be protected by law;
> they should not be distributed, used or copied without authorisation.
> If you have received this email in error, please notify the sender and de=
lete this message and its attachments.
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>

--0000000000004adf2605a40703da
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Bruno=C2=A0 &amp; all,<div><br></div><div><span style=
=3D"color:rgb(31,73,125);font-family:Calibri,sans-serif;font-size:14.6667px=
">[Bruno] On my side, I=E2=80=99ll try once and I think the LSR WG should a=
lso try to improve IS-IS performance. May be if we want to move, we should =
first release the brakes.</span>=C2=A0</div><div><br></div><div>Well from m=
y observations releasing the breaks means increasing the risks.=C2=A0</div>=
<div><br></div><div>Take BGP - breaks are off and see what happens :)=C2=A0=
</div><div><br></div><div>My personal observation is that ISIS implementati=
ons across vendors are just fine for vast majority of deployments today. Th=
at actually also includes vast majority of compute clusters as they consist=
s=C2=A0of max 10s of racks.=C2=A0</div><div><br></div><div>Of course there =
are larger clusters with 1000+ or 10K and above network elements itself and=
 x 20 L3=C2=A0computes, but is there really a need to stretch protocol to a=
ccommodate=C2=A0those ? Those usually run BGP anyway. And also there is DV+=
LS hybrid too now.=C2=A0</div><div>=C2=A0<br></div><div>ISIS flooding churn=
 (and room for optimization) becomes a problem when node boots up (IMHO thi=
s is not a problem) and when node fails while having many neighbors attache=
d. Yes maybe second case could be improved but well designed and operated n=
etwork should have pre-programmed bypass paths against such cases so IMO st=
ressing IGP to &quot;converge&quot; faster while great in principle may not=
 be really needed in practice.=C2=A0</div><div><br></div><div>Last I am wor=
ried that when IETF defines changes to core protocol behaviour the quality =
of the implementations of those changes may really differ across vendors ov=
erall resulting in much worse performance=C2=A0and stability as compared to=
 where we are today.=C2=A0</div><div><br></div><div>I am just not sure if p=
ossible gains for few deployments are greater then=C2=A0risk for 1000s of t=
oday&#39;s deployments. Maybe one size does not fit all and for massive sca=
le ISIS we should define a notion of &quot;ISIS-DC-PLUGIN&quot; which can b=
e optionally in run time added when/if needed. If that requires protocol ch=
anges to accommodate such dynamic plugins - that work should take place.=C2=
=A0</div><div><br></div><div>Many thx,</div><div>R.</div><div><br></div><di=
v>PS. Does anyone have a pointer to any real data showing that performance =
of real life WAN ISIS deployments is bad ?=C2=A0</div><div><br></div></div>=
<br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri=
, Apr 24, 2020 at 11:26 AM &lt;<a href=3D"mailto:bruno.decraene@orange.com"=
>bruno.decraene@orange.com</a>&gt; wrote:<br></div><blockquote class=3D"gma=
il_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,2=
04,204);padding-left:1ex">







<div lang=3D"FR">
<div class=3D"gmail-m_6484870522220906WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif;color:rgb(31,73,125)">Tony<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><b><span style=3D"font-=
size:10pt;font-family:Tahoma,sans-serif">From:</span></b><span style=3D"fon=
t-size:10pt;font-family:Tahoma,sans-serif">
 Tony Przygienda [mailto:<a href=3D"mailto:tonysietf@gmail.com" target=3D"_=
blank">tonysietf@gmail.com</a>] <br>
<b>Sent:</b> Thursday, April 23, 2020 7:29 PM<br>
<b>To:</b> DECRAENE Bruno TGI/OLN<br>
<b>Cc:</b> <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</=
a>; Les Ginsberg (ginsberg)<br>
<b>Subject:</b> Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed<=
u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">I was refering to RFC49=
60. Bruno, for all practical purposes I think that seems to go down the pat=
h of trying to reinvent RFC4960 (or ultimately use it).
<span style=3D"color:rgb(31,73,125)"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif;color:rgb(31,73,125)">[Bruno] I don=E2=80=99t think=
 that SCTP (RC4960) is a better fit than TCP. Many more features
 and options than TCP, <span class=3D"gmail-m_6484870522220906SpellE">way</=
span> more than needed given existing IS-IS flooding mechanism. Much less i=
mplementations experience and improvement than TCP.<u></u><u></u></span></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US">Or=
, changing the packet formats heavily to incorporate all the control loop d=
ata you need to the point you have a different control channel along those =
lines
 since you&#39;ll find most of the problems RFC4960 is describing (minus st=
uff like multiple paths).<span style=3D"color:rgb(31,73,125)"><u></u><u></u=
></span></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif;color:rgb(31,73,125)">[Bruno] Really, adding one su=
b-TLV in IS-IS is not =E2=80=9Cchanging the packet formats
 heavily=E2=80=9D.<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US">No=
thing wrong with that but it&#39;s ambitious on a 30 years old
<span class=3D"gmail-m_6484870522220906SpellE">anitque</span> artefact we&#=
39;re nursing forward here ;-)<span style=3D"color:rgb(31,73,125)"><u></u><=
u></u></span></span></p>
<p class=3D"MsoNormal"><b><i><span lang=3D"EN-US" style=3D"font-size:11pt;f=
ont-family:Calibri,sans-serif;color:rgb(31,73,125)"></span></i></b><span la=
ng=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:r=
gb(31,73,125)">[Bruno]
 I=E2=80=99m perfectly fine with revolution approaches. I think that we can=
 also provide incremental improvement to IS-IS.<b><i><u></u><u></u></i></b>=
</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US">As=
 entertaining footnote, I saw in last 20 years at least 3 attempts to allow=
 multiple TCP sessions in BGP between peers to speed/prioritize things up.
</span>All <span class=3D"gmail-m_6484870522220906SpellE">failed</span>, <s=
pan class=3D"gmail-m_6484870522220906SpellE">after</span> the first one I h=
elped to push I smarted up ;-)
<u></u><u></u></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11pt;font-family:Cali=
bri,sans-serif;color:rgb(31,73,125)"><span>=C2=A0</span></span></i></b><spa=
n lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif;col=
or:rgb(31,73,125)">[Bruno]
 On my side, I=E2=80=99ll try once and I think the LSR WG should also try t=
o improve IS-IS performance. May be if we want to move, we should first rel=
ease the brakes. I=E2=80=99m seen some progress, e.g., from =E2=80=9Cthere =
is no need to improve flooding=E2=80=9D to =E2=80=9Cwe all agree to improve
 flooding=E2=80=9D, or from =E2=80=9CNetwork operator just need to configur=
e existing CLI=E2=80=9D to =E2=80=9CWe agree that we need something more au=
tomated/dynamic=E2=80=9D. But this has been very slow progress over a year.=
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif;color:rgb(31,73,125)">--Bruno<u></u><u></u></span><=
/p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US"><u=
></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">As <span class=3D"gmail=
-m_6484870522220906SpellE">another</span>
<span class=3D"gmail-m_6484870522220906SpellE">footnote</span>: I looked @ =
all the stuff in RIFT (tcp, quic, 4960, more ephemeral stuff). I ended up a=
dding to rift bunch very rudimentary things and do roughly what Les/Peter/A=
cee started to write (modulo algorith I contributed and bunch
 things that would be helpful but we can&#39;t fit into existing packet for=
mat). This was as much decision as to &quot;what&#39;s available &amp; well=
 debugged&quot; as well as &quot;does it meet requirements&quot; as &quot;h=
ow complex is that vs. rtx in flooding architecture=C2=A0 we have today +
 some feedback&quot;. Not on powerpoint, in real production code ;-) rift d=
raft shows you the outcome of that as IMO best trade-off to achieve high fl=
ooding speeds ;-)
<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">my 2c<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">-- tony <u></u><u></u><=
/p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">On Thu, Apr 23, 2020 at=
 10:15 AM &lt;<a href=3D"mailto:bruno.decraene@orange.com" target=3D"_blank=
">bruno.decraene@orange.com</a>&gt; wrote:<u></u><u></u></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin-left:4=
.8pt;margin-right:0cm">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">
<span style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,7=
3,125)">Tony,</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">Thanks for engaging.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">Please inline [Bruno2]</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<b><span style=3D"font-size:10pt;font-family:Tahoma,sans-serif">From:</span=
></b><span style=3D"font-size:10pt;font-family:Tahoma,sans-serif"> Tony Prz=
ygienda [mailto:<a href=3D"mailto:tonysietf@gmail.com" target=3D"_blank">to=
nysietf@gmail.com</a>]
<br>
<b>Sent:</b> Wednesday, April 22, 2020 9:25 PM<br>
<b>To:</b> DECRAENE Bruno TGI/OLN<br>
<b>Cc:</b> <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</=
a>; Les Ginsberg (ginsberg)<br>
<b>Subject:</b> Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed<=
/span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
=C2=A0<u></u><u></u></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
=C2=A0<u></u><u></u></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
=C2=A0<u></u><u></u></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
On Wed, Apr 22, 2020 at 11:03 AM &lt;<a href=3D"mailto:bruno.decraene@orang=
e.com" target=3D"_blank">bruno.decraene@orange.com</a>&gt; wrote:<u></u><u>=
</u></p>
</div>
<blockquote style=3D"border-top:none currentcolor;border-right:none current=
color;border-bottom:none currentcolor;border-left:1pt solid rgb(204,204,204=
);padding:0cm 0cm 0cm 6pt;margin:5pt 0cm 5pt 4.8pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">Tony, all,</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">Thanks Tony for the technical and constructive feedb=
ack.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">Please inline [Bruno]</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
<b><span lang=3D"EN-US" style=3D"font-size:10pt;font-family:Tahoma,sans-ser=
if">From:</span></b><span lang=3D"EN-US" style=3D"font-size:10pt;font-famil=
y:Tahoma,sans-serif"> Tony Przygienda [mailto:<a href=3D"mailto:tonysietf@g=
mail.com" target=3D"_blank">tonysietf@gmail.com</a>]
<br>
<b>Sent:</b> Wednesday, April 22, 2020 1:19 AM<br>
<b>To:</b> Les Ginsberg (ginsberg)<br>
<b>Cc:</b> DECRAENE Bruno TGI/OLN; <a href=3D"mailto:lsr@ietf.org" target=
=3D"_blank">
lsr@ietf.org</a><br>
<b>Subject:</b> Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed<=
/span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
<span lang=3D"EN-US">=C2=A0</span><u></u><u></u></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
<span lang=3D"EN-US">neither am I aware of anything like this (i.e. per pla=
tform/product flooding rate constants) in any major vendor stack for whatev=
er that&#39;s worth. It&#39;s simply
<span class=3D"gmail-m_6484870522220906gmail-m-1757288230754630308gmail-m24=
84166253138266685spelle">unmaintanable</span>, point. All major vendors hav=
e extensive product lines over so many changing hardware configuration/setu=
ps it is simply not viable to attempt precise measurements
 (and even then, user changing <span class=3D"gmail-m_6484870522220906gmail=
-m-1757288230754630308gmail-m2484166253138266685spelle">
config</span> can throw the stuff off in a millisecond). There may have bee=
n here and there per deployment scenario some &quot;recommended
<span class=3D"gmail-m_6484870522220906gmail-m-1757288230754630308gmail-m24=
84166253138266685spelle">config</span>&quot; (not something I immediately r=
ecall either) but that means very fixed configuration of things &amp; how t=
hey go into networks and even then I&#39;m not aware of anyone having had
 a &quot;precise model of the chain in the box&quot;. yes, probes to measur=
e lots and lots of stuff in the boxes exist but again, those are chip/<span=
 class=3D"gmail-m_6484870522220906gmail-m-1757288230754630308gmail-m2484166=
253138266685spelle">linecard</span>/backplane/chassis/routing engine
 specific and mostly used in complex test/<span class=3D"gmail-m_6484870522=
220906gmail-m-1757288230754630308gmail-m2484166253138266685spelle">peforman=
ce</span> scenarios and not to derive some kind of equations that can predi=
ct anything much ...
</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">[Bruno] Good points.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">Yet, one of the information that we propose to adver=
tise by the LSP receiver to the LSP sender is the Receive Window.</span><u>=
</u><u></u></p>
<p class=3D"gmail-m_6484870522220906gmail-m-1757288230754630308gmail-m24841=
66253138266685msolistparagraph" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">-</span><span lang=3D"EN-US" style=3D"font-size:7pt;=
color:rgb(31,73,125)">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0
</span><span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,san=
s-serif;color:rgb(31,73,125)">This is a very common parameter and algorithm=
. Nothing fancy nor reinvented. In particular it=E2=80=99s a parameter used=
 by TCP.</span><u></u><u></u></p>
<p class=3D"gmail-m_6484870522220906gmail-m-1757288230754630308gmail-m24841=
66253138266685msolistparagraph" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">-</span><span lang=3D"EN-US" style=3D"font-size:7pt;=
color:rgb(31,73,125)">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0
</span><span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,san=
s-serif;color:rgb(31,73,125)">I would argue that TCP implementations also r=
un on a variety of hardware and systems, must wider range than IS-IS platfo=
rm. And those
 TCP implementations on all those platform manage to advertise this paramet=
er (TCP window)</span><u></u><u></u></p>
<p class=3D"gmail-m_6484870522220906gmail-m-1757288230754630308gmail-m24841=
66253138266685msolistparagraph" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">-</span><span lang=3D"EN-US" style=3D"font-size:7pt;=
color:rgb(31,73,125)">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0
</span><span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,san=
s-serif;color:rgb(31,73,125)">I fail to understand that when some WG contri=
butors proposed the use of TCP, nobody said that determining and advertisin=
g a Receive Window
 would be an issue, difficult or even impossible. But when we propose to ad=
vertise a Receive Window in an IS-IS TLV, this becomes difficult or even im=
possible for some platforms. Can anyone help me understand the technical di=
fference?</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
<span lang=3D"EN-US">=C2=A0</span><u></u><u></u></p>
</div>
</div>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
Bruno, I was waiting for that ;-)<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt;text-indent:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">[Bruno2] Good ;-)</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt;text-indent:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US">Discounted for the fact that I&#39;m not a major TCP e=
xpert: TCP is a very different beast. it has a 100-200msec fast timer &amp;=
 500msec slow (which have to be quite accurate, it&#39;s really one timer f=
or all connections=C2=A0+
<span class=3D"gmail-m_6484870522220906gmail-m-1757288230754630308spelle">m=
buf</span> and other magic) and it sends a _lot_ of packets back and forth =
with window size indications so the negotiation can happen very quickly.=C2=
=A0
</span><span class=3D"gmail-m_6484870522220906gmail-m-1757288230754630308sp=
elle">Also</span>, TCP <span class=3D"gmail-m_6484870522220906gmail-m-17572=
88230754630308spelle">
can</span> <span class=3D"gmail-m_6484870522220906gmail-m-17572882307546303=
08spelle">detect</span> losses based on sequence number received contrary t=
o routing protocols (that&#39;s one of the things we added in RIFT BTW) and=
 it can retransmit quickly when it sees a &quot;hole&quot;. Contrary to
 that in ISIS ACKs may or may not come, they may be bundled, hellos may or =
may not come and we can&#39;t retransmit stuff on 100msec timers either. It=
&#39;s an utterly different transport channel.
<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt;text-indent:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">[Bruno2] I would distinguish two things, which I thi=
nk we have done in
<a href=3D"https://tools.ietf.org/html/draft-decraene-lsr-isis-flooding-spe=
ed-03" target=3D"_blank">
https://tools.ietf.org/html/draft-decraene-lsr-isis-flooding-speed-03</a></=
span><u></u><u></u></p>
<p class=3D"gmail-m_6484870522220906gmail-m-1757288230754630308msolistparag=
raph" style=3D"margin-left:88.8pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">-</span><span lang=3D"EN-US" style=3D"font-size:7pt;=
color:rgb(31,73,125)">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0
</span><span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,san=
s-serif;color:rgb(31,73,125)">How fast you can adapt the sending rate. This=
 seems mostly dependent on the speed of the feedback loop, rather than the =
format of message.
 E.g. In IS-IS the receiver can give a feedback more or less quickly (e.g. =
depending on how fast/bundled it sends the PSNP). In theory, I don=E2=80=99=
t see a major different. From an in implementation standpoint, I=E2=80=99m =
guessing that the difference is probably bigger
 (e.g. TCP is probably lower level/closer to the system/hardware, than IS-I=
S which is more user space and possibly Platform Independent in some organi=
zations))</span><u></u><u></u></p>
<p class=3D"gmail-m_6484870522220906gmail-m-1757288230754630308msolistparag=
raph" style=3D"margin-left:88.8pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">-</span><span lang=3D"EN-US" style=3D"font-size:7pt;=
color:rgb(31,73,125)">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0
</span><span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,san=
s-serif;color:rgb(31,73,125)">How fast you can detect packet loss. I agree =
that TCP &amp; IS-IS are very different on this. We have proposed to improv=
e this by allowing
 the receiver to advertise to the sender how fast it will <span class=3D"gm=
ail-m_6484870522220906gmail-m-1757288230754630308spelle">
ack</span> the LSP. Currently the timer/behavior is known to receiver but n=
o to the sender. Hence the sender needs to assume the wort case (ISO defaul=
t).</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US">=C2=A0</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US">In more abstract terms, TCP is a sliding N-window
</span><span class=3D"gmail-m_6484870522220906gmail-m-1757288230754630308sp=
elle">protocol</span> (<span class=3D"gmail-m_6484870522220906gmail-m-17572=
88230754630308spelle">where</span> N
<span class=3D"gmail-m_6484870522220906gmail-m-1757288230754630308spelle">i=
s</span> <span class=3D"gmail-m_6484870522220906gmail-m-1757288230754630308=
spelle">
adjusted</span> all the time &amp; <span class=3D"gmail-m_6484870522220906g=
mail-m-1757288230754630308spelle">losses</span>
<span class=3D"gmail-m_6484870522220906gmail-m-1757288230754630308spelle">c=
an</span> <span class=3D"gmail-m_6484870522220906gmail-m-175728823075463030=
8spelle">
be</span> <span class=3D"gmail-m_6484870522220906gmail-m-175728823075463030=
8spelle">efficiently</span> <span class=3D"gmail-m_6484870522220906gmail-m-=
1757288230754630308spelle">
detected</span>) <span class=3D"gmail-m_6484870522220906gmail-m-17572882307=
54630308spelle">whereas</span> LSR
<span class=3D"gmail-m_6484870522220906gmail-m-1757288230754630308spelle">f=
looding</span> <span class=3D"gmail-m_6484870522220906gmail-m-1757288230754=
630308spelle">
is</span> not a <span class=3D"gmail-m_6484870522220906gmail-m-175728823075=
4630308spelle">windowing</span> <span class=3D"gmail-m_6484870522220906gmai=
l-m-1757288230754630308spelle">
protocol</span> (or <span class=3D"gmail-m_6484870522220906gmail-m-17572882=
30754630308spelle">rather</span> LSDB-size
<span class=3D"gmail-m_6484870522220906gmail-m-1757288230754630308spelle">w=
indow</span> <span class=3D"gmail-m_6484870522220906gmail-m-175728823075463=
0308spelle">
protocol</span> <span class=3D"gmail-m_6484870522220906gmail-m-175728823075=
4630308spelle">with</span> <span class=3D"gmail-m_6484870522220906gmail-m-1=
757288230754630308spelle">
selective</span> retransmission but no <span class=3D"gmail-m_6484870522220=
906gmail-m-1757288230754630308spelle">
detection</span> of <span class=3D"gmail-m_6484870522220906gmail-m-17572882=
30754630308spelle">loss</span> [or
<span class=3D"gmail-m_6484870522220906gmail-m-1757288230754630308spelle">o=
nly</span> <span class=3D"gmail-m_6484870522220906gmail-m-17572882307546303=
08spelle">
very</span> slow <span class=3D"gmail-m_6484870522220906gmail-m-17572882307=
54630308spelle">based</span> on <span class=3D"gmail-m_6484870522220906gmai=
l-m-1757288230754630308spelle">
lack</span> of ACK &amp; <span class=3D"gmail-m_6484870522220906gmail-m-175=
7288230754630308spelle">CSNPs</span>]). Disadvantage of something like TCP =
(I think I sent out the RFC with UDP control protocol work to make it more =
TCP like)
<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt;text-indent:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">[Bruno2] =C2=A0If you are referring to DCCP (Datagra=
m Congestion Control Protocol) (RFC 4340), yes you did and thank you for th=
is. Constructive feedback.</span><u></u><u></u></p>
<p class=3D"gmail-m_6484870522220906gmail-m-1757288230754630308msolistparag=
raph" style=3D"margin-left:88.8pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">-</span><span lang=3D"EN-US" style=3D"font-size:7pt;=
color:rgb(31,73,125)">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0
</span><span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,san=
s-serif;color:rgb(31,73,125)">Regarding flow control, I=E2=80=99ve quickly =
looked at DCCP and it does not provides flow control.</span><u></u><u></u><=
/p>
<p class=3D"gmail-m_6484870522220906gmail-m-1757288230754630308msolistparag=
raph" style=3D"margin-left:88.8pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">-</span><span lang=3D"EN-US" style=3D"font-size:7pt;=
color:rgb(31,73,125)">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0
</span><span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,san=
s-serif;color:rgb(31,73,125)">Regarding congestion control, possibly the al=
gorithm part may be reused. There are two
<span class=3D"gmail-m_6484870522220906gmail-m-1757288230754630308spelle">a=
lgo</span> and DCCP is open to others. May be one question is how much we w=
ant IS-IS to be fair to TCP (control plane TCP, not
<span class=3D"gmail-m_6484870522220906gmail-m-1757288230754630308spelle">d=
ataplane</span>/user plane TCP). To me, IS-IS is more important than BGP tr=
affic, given their relative importance to the network, their delay requirem=
ents, their typical volume of traffic. But that is probably
 a =E2=80=9Cdetail=E2=80=9D down the road. This is also depends on whether =
TCP &amp; IS-IS compete for the same resources (e.g. same queue) or not (id=
eally TCP and IS-IS have different queues).</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt;text-indent:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US">is that you are stuck when you put something into the =
pipe, no prioritization possible and if receiver is slow you may have multi=
ple obsolete copies in the pipe waiting &amp; lots retransmission BW when h=
oles are
 punched into the data through loss. </span>And plain TCP=C2=A0 <span class=
=3D"gmail-m_6484870522220906gmail-m-1757288230754630308spelle">
is</span> actually quite bad for control protocol traffic @ scale, almost a=
ll vendor run special version of it for BGP for that reason. Why that is is=
 out of scope of this list I think ... Flooding is really good to send lots=
 of data prioritized/in parallel
 but on <span class=3D"gmail-m_6484870522220906gmail-m-1757288230754630308s=
pelle">losses</span> <span class=3D"gmail-m_6484870522220906gmail-m-1757288=
230754630308spelle">
re</span>-TX <span class=3D"gmail-m_6484870522220906gmail-m-175728823075463=
0308spelle">is</span> slow.<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt;text-indent:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">[Bruno2] Good that we seem to make the same distinct=
ion between the control loops for the sending rate vs the retransmission.</=
span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt;text-indent:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">Regarding clarifying distinctions, draft may need to=
 better introduce the distinction between flow control and congestion contr=
ol, at least
 to structure the work and the discussion.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt;text-indent:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt;text-indent:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">Thanks</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt;text-indent:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">--Bruno</span><u></u><u></u></p>
</div>
<blockquote style=3D"border-top:none currentcolor;border-right:none current=
color;border-bottom:none currentcolor;border-left:1pt solid rgb(204,204,204=
);padding:0cm 0cm 0cm 6pt;margin:5pt 0cm 5pt 4.8pt">
<div>
<div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
<span lang=3D"EN-US">Bruno, if you&#39;re so deeply interested in that stuf=
f we can talk 1:1 off-line about implementation work on rift towards
<span class=3D"gmail-m_6484870522220906gmail-m-1757288230754630308gmail-m24=
84166253138266685spelle">adapatable</span> flooding rate</span><u></u><u></=
u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">[Bruno] Sure. My pleasure. Please propose me some ti=
meslot offline. Please note that I=E2=80=99m based in Europe (CEST), so a p=
riori during your morning
 and my evening.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">If you can also extend the offer to discuss the impl=
ementation work on the IS-IS implementation of your employer with regards t=
o adaptable flooding
 rate, and/or how network operator can configure the CLI parameters of the =
LSP senders so as to improve flooding rate without overloading the Juniper =
receiver (possibly depending on the capability of the receiver, its number =
of IS-IS neighbors=E2=80=A6 and/or whatever
 parameter that you feel are relevant) that would be most appreciated. And =
if you believe that the Juniper LSP receiver can handle any rate from any r=
easonable (e.g. 50) =C2=A0number of IGP neighbors, without (significantly) =
dropping the received LSPs, that would
 be even simpler, please advise.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
<span lang=3D"EN-US">=C2=A0</span><u></u><u></u></p>
</div>
</div>
</div>
</div>
</blockquote>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
ping me for that 1:1 on company email pls <u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
-- tony <u></u><u></u></p>
</div>
</div>
</div>
<pre style=3D"margin-left:35.4pt">_________________________________________=
___________________________________________________________________________=
_____<u></u><u></u></pre>
<pre style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></pre>
<pre style=3D"margin-left:35.4pt">Ce message et ses pieces jointes peuvent =
contenir des informations confidentielles ou privilegiees et ne doivent don=
c<u></u><u></u></pre>
<pre style=3D"margin-left:35.4pt">pas etre diffuses, exploites ou copies sa=
ns autorisation. Si vous avez recu ce message par erreur, veuillez le signa=
ler<u></u><u></u></pre>
<pre style=3D"margin-left:35.4pt">a l&#39;expediteur et le detruire ainsi q=
ue les pieces jointes. Les messages electroniques etant susceptibles d&#39;=
alteration,<u></u><u></u></pre>
<pre style=3D"margin-left:35.4pt">Orange decline toute responsabilite si ce=
 message a ete altere, deforme ou falsifie. Merci.<u></u><u></u></pre>
<pre style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></pre>
<pre style=3D"margin-left:35.4pt">This message and its attachments may cont=
ain confidential or privileged information that may be protected by law;<u>=
</u><u></u></pre>
<pre style=3D"margin-left:35.4pt">they should not be distributed, used or c=
opied without authorisation.<u></u><u></u></pre>
<pre style=3D"margin-left:35.4pt">If you have received this email in error,=
 please notify the sender and delete this message and its attachments.<u></=
u><u></u></pre>
<pre style=3D"margin-left:35.4pt">As emails may be altered, Orange is not l=
iable for messages that have been modified, changed or falsified.<u></u><u>=
</u></pre>
<pre style=3D"margin-left:35.4pt">Thank you.<u></u><u></u></pre>
</div>
</blockquote>
</div>
</div>
<pre>______________________________________________________________________=
___________________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l&#39;expediteur et le detruire ainsi que les pieces jointes. Les message=
s electroniques etant susceptibles d&#39;alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.
Thank you.
</pre></div>

_______________________________________________<br>
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<a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferrer" ta=
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</blockquote></div>

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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Mohit Sethi <mohit.m.sethi@ericsson.com>, "gen-art@ietf.org" <gen-art@ietf.org>
CC: "lsr@ietf.org" <lsr@ietf.org>, "draft-ietf-isis-mpls-elc.all@ietf.org" <draft-ietf-isis-mpls-elc.all@ietf.org>, "last-call@ietf.org" <last-call@ietf.org>
Thread-Topic: Genart last call review of draft-ietf-isis-mpls-elc-11
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Subject: Re: [Lsr] Genart last call review of draft-ietf-isis-mpls-elc-11
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Link State Routing WG of the IETF.

        Title           : OSPF YANG Model Augmentations for Additional Features - Version 1
        Authors         : Acee Lindem
                          Yingzhen Qu
	Filename        : draft-ietf-lsr-ospf-yang-augmentation-v1-01.txt
	Pages           : 23
	Date            : 2020-04-24

Abstract:
   This document defines YANG data modules augmenting the IETF OSPF YANG
   model to provide support for Traffic Engineering Extensions to OSPF
   Version 3 as defined in RF 5329, OSPF Two-Part Metric as defined in
   RFC 8042, OSPF Graceful Link Shutdown as defined in RFC 8379 and OSPF
   Link-Local Signaling (LLS) Extensions for Local Interface ID
   Advertisement as defined in RFC 8510.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-lsr-ospf-yang-augmentation-v1/

There are also htmlized versions available at:
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https://datatracker.ietf.org/doc/html/draft-ietf-lsr-ospf-yang-augmentation-v1-01

A diff from the previous version is available at:
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Link State Routing WG of the IETF.

        Title           : YANG Model for OSPFv3 Extended LSAs
        Authors         : Acee Lindem
                          Sharmila Palani
                          Yingzhen Qu
	Filename        : draft-ietf-lsr-ospfv3-extended-lsa-yang-01.txt
	Pages           : 30
	Date            : 2020-04-24

Abstract:
   This document defines a YANG data model augmenting the IETF OSPF YANG
   model to provide support for OSPFv3 Link State Advertisment (LSA)
   Extensibility as defined in RFC 8362.  OSPFv3 Extended LSAs provide
   extensible TLV-based LSAs for the base LSA types defined in RFC 5340.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-lsr-ospfv3-extended-lsa-yang/

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https://datatracker.ietf.org/doc/html/draft-ietf-lsr-ospfv3-extended-lsa-yang-01

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https://www.ietf.org/rfcdiff?url2=draft-ietf-lsr-ospfv3-extended-lsa-yang-01


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From: Robert Raszuk <robert@raszuk.net>
Date: Mon, 27 Apr 2020 12:08:53 +0200
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To: Bruno Decraene <bruno.decraene@orange.com>
Cc: Tony Przygienda <tonysietf@gmail.com>,  "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>, "lsr@ietf.org" <lsr@ietf.org>
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Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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> Slow flooding increase the likelihood of multiple IGP SPF computations

True.

But if you keep your IGP nicely organized in area and levels, get rid of
flooding anything incl. /32s domain wide to address bugs in MPLS
architecture then your flooding radius is usually very small.

That in turn allows for both fast flooding and fast topology computation
while only dealing with few external summaries. I am yet to see a
practical case where a well designed network with today's ISIS requires
flooding speedup.

Best,
R.




On Mon, Apr 27, 2020 at 10:34 AM <bruno.decraene@orange.com> wrote:

> =C3=98  ISIS flooding churn (and room for optimization) becomes a problem=
 when
> node boots up (IMHO this is not a problem) and when node fails while havi=
ng
> many neighbors attached. Yes maybe second case could be improved but well
> designed and operated network should have pre-programmed bypass paths
> against such cases so IMO stressing IGP to "converge" faster while great =
in
> principle may not be really needed in practice.
>
>
>
> I don=E2=80=99t think that FRR is a replacement for =E2=80=9Cfast=E2=80=
=9D (I=E2=80=99d rather say
> adequate) IGP convergence & flooding.
>
> For multiple reasons such as:
>
> -          Multiple =E2=80=98things=E2=80=99 depends on the IGP, such as =
BGP best path
> selection, CSPF/TE/PCE computations, FRR computations
>
> -          Slow flooding increase the likelihood of multiple IGP SPF
> computations which is harmful for other computations which are typically
> heavier and manifolds (cf above)
>
> -          Multiple IGP SPF computations also create multiple transient
> forwarding loops. There are some techniques to remove forwarding loops bu=
t
> this is still an advanced topic and some implementations do not handle
> consecutives IGP SPF (with =E2=80=98overlapping=E2=80=99 convergences and=
 combined
> distributed forwarding loops)
>
> -          For FRR, you mostly need to pre-decide/configure whether you
> want to protect link or node failures. Tradeoff are involved and given
> probability of events, link protection is usually enabled (hence not node
> protection)
>
> -          =E2=80=A6
>
>
>
> Also, given the current =E2=80=9Cstate of the art=E2=80=9D, there is no s=
tressing
> involved. Really. Using TCP, my 200=E2=82=AC mobile running on battery an=
d over
> wifi+ADSL+Internet can achieve better communication throughput than a
> n*100k=E2=82=AC high end IS-IS router.
>
> I think many persons agree that IS-IS could do better in term of flooding=
.
> (possibly not as good as a brand new approach, but incremental improvemen=
t
> also have some benefits). Eventually, we don=E2=80=99t need everyone to a=
gree on
> this.
>
>
>
> =C3=98  PS. Does anyone have a pointer to any real data showing that
> performance of real life WAN ISIS deployments is bad ?
>
>
>
> In some of our ASes, we do monitor IS-IS by listening to and recording
> flooded LSPs. I can=E2=80=99t share any data.
>
> Next question could be what is =E2=80=9Cgood enough=E2=80=9D. I guess thi=
s may depend on
> the size of your network, its topology, and your requirements.
>
>
>
> We also ran tests in labs. I may share some results during my
> presentation. (no names, possibly no KPI, but some high level outcomes).
>
>
>
> Regards,
>
> Bruno
>
>
>
>
>
> *From**:* Robert Raszuk [mailto:robert@raszuk.net]
> *Sent:* Friday, April 24, 2020 12:42 PM
> *To:* DECRAENE Bruno TGI/OLN
> *Cc:* Tony Przygienda; Les Ginsberg (ginsberg); lsr@ietf.org
> *Subject:* Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
>
>
>
> Hi Bruno  & all,
>
>
>
> [Bruno] On my side, I=E2=80=99ll try once and I think the LSR WG should a=
lso try
> to improve IS-IS performance. May be if we want to move, we should first
> release the brakes.
>
>
>
> Well from my observations releasing the breaks means increasing the risks=
.
>
>
>
> Take BGP - breaks are off and see what happens :)
>
>
>
> My personal observation is that ISIS implementations across vendors are
> just fine for vast majority of deployments today. That actually also
> includes vast majority of compute clusters as they consists of max 10s of
> racks.
>
>
>
> Of course there are larger clusters with 1000+ or 10K and above network
> elements itself and x 20 L3 computes, but is there really a need to stret=
ch
> protocol to accommodate those ? Those usually run BGP anyway. And also
> there is DV+LS hybrid too now.
>
>
>
> ISIS flooding churn (and room for optimization) becomes a problem when
> node boots up (IMHO this is not a problem) and when node fails while havi=
ng
> many neighbors attached. Yes maybe second case could be improved but well
> designed and operated network should have pre-programmed bypass paths
> against such cases so IMO stressing IGP to "converge" faster while great =
in
> principle may not be really needed in practice.
>
>
>
> Last I am worried that when IETF defines changes to core protocol
> behaviour the quality of the implementations of those changes may really
> differ across vendors overall resulting in much worse performance and
> stability as compared to where we are today.
>
>
>
> I am just not sure if possible gains for few deployments are greater
> then risk for 1000s of today's deployments. Maybe one size does not fit a=
ll
> and for massive scale ISIS we should define a notion of "ISIS-DC-PLUGIN"
> which can be optionally in run time added when/if needed. If that require=
s
> protocol changes to accommodate such dynamic plugins - that work should
> take place.
>
>
>
> Many thx,
>
> R.
>
>
>
> PS. Does anyone have a pointer to any real data showing that performance
> of real life WAN ISIS deployments is bad ?
>
>
>
>
>
> On Fri, Apr 24, 2020 at 11:26 AM <bruno.decraene@orange.com> wrote:
>
> Tony
>
>
>
> *From:* Tony Przygienda [mailto:tonysietf@gmail.com]
> *Sent:* Thursday, April 23, 2020 7:29 PM
> *To:* DECRAENE Bruno TGI/OLN
> *Cc:* lsr@ietf.org; Les Ginsberg (ginsberg)
> *Subject:* Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
>
>
>
> I was refering to RFC4960. Bruno, for all practical purposes I think that
> seems to go down the path of trying to reinvent RFC4960 (or ultimately us=
e
> it).
>
> [Bruno] I don=E2=80=99t think that SCTP (RC4960) is a better fit than TCP=
. Many
> more features and options than TCP, way more than needed given existing
> IS-IS flooding mechanism. Much less implementations experience and
> improvement than TCP.
>
> Or, changing the packet formats heavily to incorporate all the control
> loop data you need to the point you have a different control channel alon=
g
> those lines since you'll find most of the problems RFC4960 is describing
> (minus stuff like multiple paths).
>
> [Bruno] Really, adding one sub-TLV in IS-IS is not =E2=80=9Cchanging the =
packet
> formats heavily=E2=80=9D.
>
> Nothing wrong with that but it's ambitious on a 30 years old anitque
> artefact we're nursing forward here ;-)
>
> [Bruno] I=E2=80=99m perfectly fine with revolution approaches. I think th=
at we can
> also provide incremental improvement to IS-IS.
>
> As entertaining footnote, I saw in last 20 years at least 3 attempts to
> allow multiple TCP sessions in BGP between peers to speed/prioritize thin=
gs
> up. All failed, after the first one I helped to push I smarted up ;-)
>
>  [Bruno] On my side, I=E2=80=99ll try once and I think the LSR WG should =
also try
> to improve IS-IS performance. May be if we want to move, we should first
> release the brakes. I=E2=80=99m seen some progress, e.g., from =E2=80=9Ct=
here is no need to
> improve flooding=E2=80=9D to =E2=80=9Cwe all agree to improve flooding=E2=
=80=9D, or from =E2=80=9CNetwork
> operator just need to configure existing CLI=E2=80=9D to =E2=80=9CWe agre=
e that we need
> something more automated/dynamic=E2=80=9D. But this has been very slow pr=
ogress
> over a year.
>
>
>
> --Bruno
>
>
>
> As another footnote: I looked @ all the stuff in RIFT (tcp, quic, 4960,
> more ephemeral stuff). I ended up adding to rift bunch very rudimentary
> things and do roughly what Les/Peter/Acee started to write (modulo algori=
th
> I contributed and bunch things that would be helpful but we can't fit int=
o
> existing packet format). This was as much decision as to "what's availabl=
e
> & well debugged" as well as "does it meet requirements" as "how complex i=
s
> that vs. rtx in flooding architecture  we have today + some feedback". No=
t
> on powerpoint, in real production code ;-) rift draft shows you the outco=
me
> of that as IMO best trade-off to achieve high flooding speeds ;-)
>
>
>
> my 2c
>
>
>
> -- tony
>
>
>
> On Thu, Apr 23, 2020 at 10:15 AM <bruno.decraene@orange.com> wrote:
>
> Tony,
>
> Thanks for engaging.
>
> Please inline [Bruno2]
>
>
>
>
>
>
>
> *From:* Tony Przygienda [mailto:tonysietf@gmail.com]
> *Sent:* Wednesday, April 22, 2020 9:25 PM
> *To:* DECRAENE Bruno TGI/OLN
> *Cc:* lsr@ietf.org; Les Ginsberg (ginsberg)
> *Subject:* Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
>
>
>
>
>
>
>
> On Wed, Apr 22, 2020 at 11:03 AM <bruno.decraene@orange.com> wrote:
>
> Tony, all,
>
>
>
> Thanks Tony for the technical and constructive feedback.
>
> Please inline [Bruno]
>
>
>
> *From:* Tony Przygienda [mailto:tonysietf@gmail.com]
> *Sent:* Wednesday, April 22, 2020 1:19 AM
> *To:* Les Ginsberg (ginsberg)
> *Cc:* DECRAENE Bruno TGI/OLN; lsr@ietf.org
> *Subject:* Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
>
>
>
> neither am I aware of anything like this (i.e. per platform/product
> flooding rate constants) in any major vendor stack for whatever that's
> worth. It's simply unmaintanable, point. All major vendors have extensive
> product lines over so many changing hardware configuration/setups it is
> simply not viable to attempt precise measurements (and even then, user
> changing config can throw the stuff off in a millisecond). There may have
> been here and there per deployment scenario some "recommended config"
> (not something I immediately recall either) but that means very fixed
> configuration of things & how they go into networks and even then I'm not
> aware of anyone having had a "precise model of the chain in the box". yes=
,
> probes to measure lots and lots of stuff in the boxes exist but again,
> those are chip/linecard/backplane/chassis/routing engine specific and
> mostly used in complex test/peformance scenarios and not to derive some
> kind of equations that can predict anything much ...
>
> [Bruno] Good points.
>
> Yet, one of the information that we propose to advertise by the LSP
> receiver to the LSP sender is the Receive Window.
>
> -          This is a very common parameter and algorithm. Nothing fancy
> nor reinvented. In particular it=E2=80=99s a parameter used by TCP.
>
> -          I would argue that TCP implementations also run on a variety
> of hardware and systems, must wider range than IS-IS platform. And those
> TCP implementations on all those platform manage to advertise this
> parameter (TCP window)
>
> -          I fail to understand that when some WG contributors proposed
> the use of TCP, nobody said that determining and advertising a Receive
> Window would be an issue, difficult or even impossible. But when we propo=
se
> to advertise a Receive Window in an IS-IS TLV, this becomes difficult or
> even impossible for some platforms. Can anyone help me understand the
> technical difference?
>
>
>
>
>
> Bruno, I was waiting for that ;-)
>
> [Bruno2] Good ;-)
>
>
>
> Discounted for the fact that I'm not a major TCP expert: TCP is a very
> different beast. it has a 100-200msec fast timer & 500msec slow (which ha=
ve
> to be quite accurate, it's really one timer for all connections + mbuf
> and other magic) and it sends a _lot_ of packets back and forth with wind=
ow
> size indications so the negotiation can happen very quickly.  Also, TCP
> can detect losses based on sequence number received contrary to routing
> protocols (that's one of the things we added in RIFT BTW) and it can
> retransmit quickly when it sees a "hole". Contrary to that in ISIS ACKs m=
ay
> or may not come, they may be bundled, hellos may or may not come and we
> can't retransmit stuff on 100msec timers either. It's an utterly differen=
t
> transport channel.
>
> [Bruno2] I would distinguish two things, which I think we have done in
> https://tools.ietf.org/html/draft-decraene-lsr-isis-flooding-speed-03
>
> -          How fast you can adapt the sending rate. This seems mostly
> dependent on the speed of the feedback loop, rather than the format of
> message. E.g. In IS-IS the receiver can give a feedback more or less
> quickly (e.g. depending on how fast/bundled it sends the PSNP). In theory=
,
> I don=E2=80=99t see a major different. From an in implementation standpoi=
nt, I=E2=80=99m
> guessing that the difference is probably bigger (e.g. TCP is probably low=
er
> level/closer to the system/hardware, than IS-IS which is more user space
> and possibly Platform Independent in some organizations))
>
> -          How fast you can detect packet loss. I agree that TCP & IS-IS
> are very different on this. We have proposed to improve this by allowing
> the receiver to advertise to the sender how fast it will ack the LSP.
> Currently the timer/behavior is known to receiver but no to the sender.
> Hence the sender needs to assume the wort case (ISO default).
>
>
>
> In more abstract terms, TCP is a sliding N-window protocol (where N is
> adjusted all the time & losses can be efficiently detected) whereas LSR
> flooding is not a windowing protocol (or rather LSDB-size window protocol
> with selective retransmission but no detection of loss [or only very slow
> based on lack of ACK & CSNPs]). Disadvantage of something like TCP (I
> think I sent out the RFC with UDP control protocol work to make it more T=
CP
> like)
>
> [Bruno2]  If you are referring to DCCP (Datagram Congestion Control
> Protocol) (RFC 4340), yes you did and thank you for this. Constructive
> feedback.
>
> -          Regarding flow control, I=E2=80=99ve quickly looked at DCCP an=
d it
> does not provides flow control.
>
> -          Regarding congestion control, possibly the algorithm part may
> be reused. There are two algo and DCCP is open to others. May be one
> question is how much we want IS-IS to be fair to TCP (control plane TCP,
> not dataplane/user plane TCP). To me, IS-IS is more important than BGP
> traffic, given their relative importance to the network, their delay
> requirements, their typical volume of traffic. But that is probably a
> =E2=80=9Cdetail=E2=80=9D down the road. This is also depends on whether T=
CP & IS-IS compete
> for the same resources (e.g. same queue) or not (ideally TCP and IS-IS ha=
ve
> different queues).
>
>
>
> is that you are stuck when you put something into the pipe, no
> prioritization possible and if receiver is slow you may have multiple
> obsolete copies in the pipe waiting & lots retransmission BW when holes a=
re
> punched into the data through loss. And plain TCP  is actually quite bad
> for control protocol traffic @ scale, almost all vendor run special versi=
on
> of it for BGP for that reason. Why that is is out of scope of this list I
> think ... Flooding is really good to send lots of data prioritized/in
> parallel but on losses re-TX is slow.
>
> [Bruno2] Good that we seem to make the same distinction between the
> control loops for the sending rate vs the retransmission.
>
> Regarding clarifying distinctions, draft may need to better introduce the
> distinction between flow control and congestion control, at least to
> structure the work and the discussion.
>
>
>
> Thanks
>
> --Bruno
>
> Bruno, if you're so deeply interested in that stuff we can talk 1:1
> off-line about implementation work on rift towards adapatable flooding
> rate
>
> [Bruno] Sure. My pleasure. Please propose me some timeslot offline. Pleas=
e
> note that I=E2=80=99m based in Europe (CEST), so a priori during your mor=
ning and
> my evening.
>
> If you can also extend the offer to discuss the implementation work on th=
e
> IS-IS implementation of your employer with regards to adaptable flooding
> rate, and/or how network operator can configure the CLI parameters of the
> LSP senders so as to improve flooding rate without overloading the Junipe=
r
> receiver (possibly depending on the capability of the receiver, its numbe=
r
> of IS-IS neighbors=E2=80=A6 and/or whatever parameter that you feel are r=
elevant)
> that would be most appreciated. And if you believe that the Juniper LSP
> receiver can handle any rate from any reasonable (e.g. 50)  number of IGP
> neighbors, without (significantly) dropping the received LSPs, that would
> be even simpler, please advise.
>
>
>
>
>
>
>
> ping me for that 1:1 on company email pls
>
>
>
> -- tony
>
> _________________________________________________________________________=
________________________________________________
>
>
>
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>
> Orange decline toute responsabilite si ce message a ete altere, deforme o=
u falsifie. Merci.
>
>
>
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>
> they should not be distributed, used or copied without authorisation.
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>
> Thank you.
>
> _________________________________________________________________________=
________________________________________________
>
>
>
> Ce message et ses pieces jointes peuvent contenir des informations confid=
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>
> pas etre diffuses, exploites ou copies sans autorisation. Si vous avez re=
cu ce message par erreur, veuillez le signaler
>
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>
> Orange decline toute responsabilite si ce message a ete altere, deforme o=
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>
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> Ce message et ses pieces jointes peuvent contenir des informations confid=
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> Orange decline toute responsabilite si ce message a ete altere, deforme o=
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>
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> they should not be distributed, used or copied without authorisation.
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>

--0000000000009730e205a442e7cb
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div><span style=3D"font-family:&quot;Times New Roman&quot=
;,serif;font-size:16px"><br></span></div><span style=3D"font-family:&quot;T=
imes New Roman&quot;,serif;font-size:16px">&gt; Slow flooding increase the =
likelihood of multiple IGP SPF computations</span>=C2=A0=C2=A0<br><div><br>=
</div><div>True.=C2=A0</div><div><br></div><div>But if you keep your IGP ni=
cely organized in area and levels, get rid of flooding anything incl. /32s =
domain wide to address bugs in MPLS architecture then your flooding radius =
is usually very small.=C2=A0</div><div><br></div><div>That in turn=C2=A0all=
ows for both fast flooding and fast topology computation while only dealing=
 with few external summaries. I am yet to see a practical=C2=A0case where a=
 well designed network with=C2=A0today&#39;s ISIS requires flooding speedup=
.</div><div><br></div><div>Best,</div><div>R.</div><div><br></div><div><br>=
</div><div>=C2=A0</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr=
" class=3D"gmail_attr">On Mon, Apr 27, 2020 at 10:34 AM &lt;<a href=3D"mail=
to:bruno.decraene@orange.com">bruno.decraene@orange.com</a>&gt; wrote:<br><=
/div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;bo=
rder-left:1px solid rgb(204,204,204);padding-left:1ex">







<div lang=3D"FR">
<div class=3D"gmail-m_-1289438270283603598WordSection1">
<p class=3D"gmail-m_-1289438270283603598MsoListParagraph"><u></u><span lang=
=3D"EN-US" style=3D"font-family:Wingdings"><span>=C3=98<span style=3D"font:=
7pt &quot;Times New Roman&quot;">=C2=A0
</span></span></span><u></u><span lang=3D"EN-US">ISIS flooding churn (and r=
oom for optimization) becomes a problem when node boots up (IMHO this is no=
t a problem) and when node fails while having many neighbors attached. Yes
 maybe second case could be improved but well designed and operated network=
 should have pre-programmed bypass paths against such cases so IMO stressin=
g IGP to &quot;converge&quot; faster while great in principle may not be re=
ally needed in practice.=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"gmail-m_-1289438270283603598MsoListParagraph"><span lang=3D"EN-=
US">I don=E2=80=99t think that FRR is a replacement for =E2=80=9Cfast=E2=80=
=9D (I=E2=80=99d rather say adequate) IGP convergence &amp; flooding.<u></u=
><u></u></span></p>
<p class=3D"gmail-m_-1289438270283603598MsoListParagraph"><span lang=3D"EN-=
US">For multiple reasons such as:<u></u><u></u></span></p>
<p class=3D"gmail-m_-1289438270283603598MsoListParagraph" style=3D"margin-l=
eft:54pt">
<u></u><span lang=3D"EN-US"><span>-<span style=3D"font:7pt &quot;Times New =
Roman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span lang=3D"EN-US">Multiple =E2=80=98things=
=E2=80=99 depends on the IGP, such as BGP best path selection, CSPF/TE/PCE =
computations, FRR computations<u></u><u></u></span></p>
<p class=3D"gmail-m_-1289438270283603598MsoListParagraph" style=3D"margin-l=
eft:54pt">
<u></u><span lang=3D"EN-US"><span>-<span style=3D"font:7pt &quot;Times New =
Roman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span lang=3D"EN-US">Slow flooding increase the=
 likelihood of multiple IGP SPF computations which is harmful for other com=
putations which are typically heavier and manifolds (<span class=3D"gmail-m=
_-1289438270283603598SpellE">cf</span>
 above)<u></u><u></u></span></p>
<p class=3D"gmail-m_-1289438270283603598MsoListParagraph" style=3D"margin-l=
eft:54pt">
<u></u><span lang=3D"EN-US"><span>-<span style=3D"font:7pt &quot;Times New =
Roman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span lang=3D"EN-US">Multiple IGP SPF computati=
ons also create multiple transient forwarding loops. There are some techniq=
ues to remove forwarding loops but this is still an advanced topic and some
 implementations do not handle consecutives IGP SPF (with =E2=80=98overlapp=
ing=E2=80=99 convergences and combined distributed forwarding loops)<u></u>=
<u></u></span></p>
<p class=3D"gmail-m_-1289438270283603598MsoListParagraph" style=3D"margin-l=
eft:54pt">
<u></u><span lang=3D"EN-US"><span>-<span style=3D"font:7pt &quot;Times New =
Roman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span lang=3D"EN-US">For FRR, you mostly need t=
o pre-decide/configure whether you want to protect link or node failures. T=
radeoff are involved and given probability of events, link protection is us=
ually
 enabled (hence not node protection)<u></u><u></u></span></p>
<p class=3D"gmail-m_-1289438270283603598MsoListParagraph" style=3D"margin-l=
eft:54pt">
<u></u><span lang=3D"EN-US"><span>-<span style=3D"font:7pt &quot;Times New =
Roman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span lang=3D"EN-US">=E2=80=A6<u></u><u></u></s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:18pt"><span lang=3D"EN-US">Also=
, given the current =E2=80=9Cstate of the art=E2=80=9D, there is no stressi=
ng involved. Really. Using TCP, my 200=E2=82=AC mobile running on battery a=
nd over
<span class=3D"gmail-m_-1289438270283603598SpellE">wifi+ADSL+Internet</span=
> can achieve better communication throughput than a n*100k=E2=82=AC high e=
nd IS-IS router.<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:18pt"><span lang=3D"EN-US">I th=
ink many persons agree that IS-IS could do better in term of flooding. (pos=
sibly not as good as a brand new approach, but incremental improvement also=
 have
 some benefits). Eventually, we don=E2=80=99t need everyone to agree on thi=
s.<u></u><u></u></span></p>
<p class=3D"gmail-m_-1289438270283603598MsoListParagraph"><span lang=3D"EN-=
US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"gmail-m_-1289438270283603598MsoListParagraph"><u></u><span lang=
=3D"EN-US" style=3D"font-family:Wingdings"><span>=C3=98<span style=3D"font:=
7pt &quot;Times New Roman&quot;">=C2=A0
</span></span></span><u></u><span lang=3D"EN-US">PS. Does anyone have a poi=
nter to any real data showing that performance of real life WAN ISIS deploy=
ments is bad ?=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">In some of our
<span class=3D"gmail-m_-1289438270283603598SpellE">ASes</span>, we do monit=
or IS-IS by listening to and recording flooded LSPs. I can=E2=80=99t share =
any data.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Next question could be what is =
=E2=80=9Cgood enough=E2=80=9D. I guess this may depend on the size of your =
network, its topology, and your requirements.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">We also ran tests in labs. I ma=
y share some results during my presentation. (no names, possibly no KPI, bu=
t some high level outcomes).<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Regards,<u></u><u></u></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Bruno<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></=
p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span class=3D"gmail-m_=
-1289438270283603598SpellE"><b><span style=3D"font-size:10pt;font-family:Ta=
homa,sans-serif">From</span></b></span><b><span style=3D"font-size:10pt;fon=
t-family:Tahoma,sans-serif">:</span></b><span style=3D"font-size:10pt;font-=
family:Tahoma,sans-serif">
 Robert Raszuk [mailto:<a href=3D"mailto:robert@raszuk.net" target=3D"_blan=
k">robert@raszuk.net</a>] <br>
<b>Sent:</b> Friday, April 24, 2020 12:42 PM<br>
<b>To:</b> DECRAENE Bruno TGI/OLN<br>
<b>Cc:</b> Tony Przygienda; Les Ginsberg (ginsberg); <a href=3D"mailto:lsr@=
ietf.org" target=3D"_blank">lsr@ietf.org</a><br>
<b>Subject:</b> Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed<=
u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">Hi Bruno=C2=A0 &amp; al=
l,<u></u><u></u></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span style=3D"font-siz=
e:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">[Bruno] On my s=
ide, I=E2=80=99ll try once and I think the LSR WG should also try to improv=
e IS-IS performance. May be if we want to move,
 we should first release the brakes.</span>=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">Well from my observatio=
ns releasing the breaks means increasing the risks.=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">Take BGP - breaks are o=
ff and see what happens :)=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">My personal observation=
 is that ISIS implementations across vendors are just fine for vast majorit=
y of deployments today. That actually also includes vast majority of comput=
e clusters as they consists=C2=A0of max 10s
 of racks.=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">Of course there are lar=
ger clusters with 1000+ or 10K and above network elements itself and x 20 L=
3=C2=A0computes, but is there really a need to stretch protocol to accommod=
ate=C2=A0those ? Those usually run BGP anyway.
 And also there is DV+LS hybrid too now.=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">=C2=A0<u></u><u></u></p=
>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">ISIS flooding churn (an=
d room for optimization) becomes a problem when node boots up (IMHO this is=
 not a problem) and when node fails while having many neighbors attached. Y=
es maybe second case could be improved
 but well designed and operated network should have pre-programmed bypass p=
aths against such cases so IMO stressing IGP to &quot;converge&quot; faster=
 while great in principle may not be really needed in practice.=C2=A0<u></u=
><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">Last I am worried that =
when IETF defines changes to core protocol behaviour the quality of the imp=
lementations of those changes may really differ across vendors overall resu=
lting in much worse performance=C2=A0and
 stability as compared to where we are today.=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">I am just not sure if p=
ossible gains for few deployments are greater then=C2=A0risk for 1000s of t=
oday&#39;s deployments. Maybe one size does not fit all and for massive sca=
le ISIS we should define a notion of &quot;ISIS-DC-PLUGIN&quot;
 which can be optionally in run time added when/if needed. If that requires=
 protocol changes to accommodate such dynamic plugins - that work should ta=
ke place.=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">Many thx,<u></u><u></u>=
</p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">R.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">PS. Does anyone have a =
pointer to any real data showing that performance of real life WAN ISIS dep=
loyments is bad ?=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">On Fri, Apr 24, 2020 at=
 11:26 AM &lt;<a href=3D"mailto:bruno.decraene@orange.com" target=3D"_blank=
">bruno.decraene@orange.com</a>&gt; wrote:<u></u><u></u></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin-left:4=
.8pt;margin-right:0cm">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">
<span style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,7=
3,125)">Tony</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">
<span style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,7=
3,125)">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<b><span style=3D"font-size:10pt;font-family:Tahoma,sans-serif">From:</span=
></b><span style=3D"font-size:10pt;font-family:Tahoma,sans-serif"> Tony Prz=
ygienda [mailto:<a href=3D"mailto:tonysietf@gmail.com" target=3D"_blank">to=
nysietf@gmail.com</a>]
<br>
<b>Sent:</b> Thursday, April 23, 2020 7:29 PM<br>
<b>To:</b> DECRAENE Bruno TGI/OLN<br>
<b>Cc:</b> <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</=
a>; Les Ginsberg (ginsberg)<br>
<b>Subject:</b> Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed<=
/span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
=C2=A0<u></u><u></u></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
I was refering to RFC4960. Bruno, for all practical purposes I think that s=
eems to go down the path of trying to reinvent RFC4960 (or ultimately use i=
t).
<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">[Bruno] I don=E2=80=99t think that SCTP (RC4960) is =
a better fit than TCP. Many more features and options than TCP,
<span class=3D"gmail-m_-1289438270283603598gmail-m6484870522220906spelle">w=
ay</span> more than needed given existing IS-IS flooding mechanism. Much le=
ss implementations experience and improvement than TCP.</span><u></u><u></u=
></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US">Or, changing the packet formats heavily to incorporate=
 all the control loop data you need to the point you have a different contr=
ol channel along those lines since you&#39;ll find most of the problems RFC=
4960 is
 describing (minus stuff like multiple paths).</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">[Bruno] Really, adding one sub-TLV in IS-IS is not =
=E2=80=9Cchanging the packet formats heavily=E2=80=9D.</span><u></u><u></u>=
</p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US">Nothing wrong with that but it&#39;s ambitious on a 30=
 years old
<span class=3D"gmail-m_-1289438270283603598gmail-m6484870522220906spelle">a=
nitque</span> artefact we&#39;re nursing forward here ;-)</span><u></u><u><=
/u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">[Bruno] I=E2=80=99m perfectly fine with revolution a=
pproaches. I think that we can also provide incremental improvement to IS-I=
S.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US">As entertaining footnote, I saw in last 20 years at le=
ast 3 attempts to allow multiple TCP sessions in BGP between peers to speed=
/prioritize things up.
</span>All <span class=3D"gmail-m_-1289438270283603598gmail-m64848705222209=
06spelle">failed</span>, <span class=3D"gmail-m_-1289438270283603598gmail-m=
6484870522220906spelle">
after</span> the first one I helped to push I smarted up ;-) <u></u><u></u>=
</p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">
<b><i><span style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rg=
b(31,73,125)">=C2=A0</span></i></b><span lang=3D"EN-US" style=3D"font-size:=
11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">[Bruno] On my sid=
e, I=E2=80=99ll try once and
 I think the LSR WG should also try to improve IS-IS performance. May be if=
 we want to move, we should first release the brakes. I=E2=80=99m seen some=
 progress, e.g., from =E2=80=9Cthere is no need to improve flooding=E2=80=
=9D to =E2=80=9Cwe all agree to improve flooding=E2=80=9D, or from =E2=80=
=9CNetwork
 operator just need to configure existing CLI=E2=80=9D to =E2=80=9CWe agree=
 that we need something more automated/dynamic=E2=80=9D. But this has been =
very slow progress over a year.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">--Bruno</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US">=C2=A0</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
As <span class=3D"gmail-m_-1289438270283603598gmail-m6484870522220906spelle=
">another</span> <span class=3D"gmail-m_-1289438270283603598gmail-m64848705=
22220906spelle">
footnote</span>: I looked @ all the stuff in RIFT (tcp, quic, 4960, more ep=
hemeral stuff). I ended up adding to rift bunch very rudimentary things and=
 do roughly what Les/Peter/Acee started to write (modulo algorith I contrib=
uted and bunch things that would
 be helpful but we can&#39;t fit into existing packet format). This was as =
much decision as to &quot;what&#39;s available &amp; well debugged&quot; as=
 well as &quot;does it meet requirements&quot; as &quot;how complex is that=
 vs. rtx in flooding architecture=C2=A0 we have today + some feedback&quot;=
. Not
 on powerpoint, in real production code ;-) rift draft shows you the outcom=
e of that as IMO best trade-off to achieve high flooding speeds ;-)
<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
my 2c<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
-- tony <u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
=C2=A0<u></u><u></u></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
On Thu, Apr 23, 2020 at 10:15 AM &lt;<a href=3D"mailto:bruno.decraene@orang=
e.com" target=3D"_blank">bruno.decraene@orange.com</a>&gt; wrote:<u></u><u>=
</u></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin:5pt 0c=
m 5pt 4.8pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<span style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,7=
3,125)">Tony,</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">Thanks for engaging.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">Please inline [Bruno2]</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
<b><span style=3D"font-size:10pt;font-family:Tahoma,sans-serif">From:</span=
></b><span style=3D"font-size:10pt;font-family:Tahoma,sans-serif"> Tony Prz=
ygienda [mailto:<a href=3D"mailto:tonysietf@gmail.com" target=3D"_blank">to=
nysietf@gmail.com</a>]
<br>
<b>Sent:</b> Wednesday, April 22, 2020 9:25 PM<br>
<b>To:</b> DECRAENE Bruno TGI/OLN<br>
<b>Cc:</b> <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</=
a>; Les Ginsberg (ginsberg)<br>
<b>Subject:</b> Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed<=
/span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
=C2=A0<u></u><u></u></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
=C2=A0<u></u><u></u></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
=C2=A0<u></u><u></u></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
On Wed, Apr 22, 2020 at 11:03 AM &lt;<a href=3D"mailto:bruno.decraene@orang=
e.com" target=3D"_blank">bruno.decraene@orange.com</a>&gt; wrote:<u></u><u>=
</u></p>
</div>
<blockquote style=3D"border-left:1pt solid rgb(204,204,204);padding:0cm 0cm=
 0cm 6pt;margin:5pt 0cm 5pt 4.8pt;border-top:currentcolor;border-right:curr=
entcolor;border-bottom:currentcolor">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">Tony, all,</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">Thanks Tony for the technical and constructive feedb=
ack.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">Please inline [Bruno]</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:141.6pt">
<b><span lang=3D"EN-US" style=3D"font-size:10pt;font-family:Tahoma,sans-ser=
if">From:</span></b><span lang=3D"EN-US" style=3D"font-size:10pt;font-famil=
y:Tahoma,sans-serif"> Tony Przygienda [mailto:<a href=3D"mailto:tonysietf@g=
mail.com" target=3D"_blank">tonysietf@gmail.com</a>]
<br>
<b>Sent:</b> Wednesday, April 22, 2020 1:19 AM<br>
<b>To:</b> Les Ginsberg (ginsberg)<br>
<b>Cc:</b> DECRAENE Bruno TGI/OLN; <a href=3D"mailto:lsr@ietf.org" target=
=3D"_blank">
lsr@ietf.org</a><br>
<b>Subject:</b> Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed<=
/span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:141.6pt">
<span lang=3D"EN-US">=C2=A0</span><u></u><u></u></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:141.6pt">
<span lang=3D"EN-US">neither am I aware of anything like this (i.e. per pla=
tform/product flooding rate constants) in any major vendor stack for whatev=
er that&#39;s worth. It&#39;s simply
<span class=3D"gmail-m_-1289438270283603598gmail-m6484870522220906gmail-m-1=
757288230754630308gmail-m2484166253138266685spelle">
unmaintanable</span>, point. All major vendors have extensive product lines=
 over so many changing hardware configuration/setups it is simply not viabl=
e to attempt precise measurements (and even then, user changing
<span class=3D"gmail-m_-1289438270283603598gmail-m6484870522220906gmail-m-1=
757288230754630308gmail-m2484166253138266685spelle">
config</span> can throw the stuff off in a millisecond). There may have bee=
n here and there per deployment scenario some &quot;recommended
<span class=3D"gmail-m_-1289438270283603598gmail-m6484870522220906gmail-m-1=
757288230754630308gmail-m2484166253138266685spelle">
config</span>&quot; (not something I immediately recall either) but that me=
ans very fixed configuration of things &amp; how they go into networks and =
even then I&#39;m not aware of anyone having had a &quot;precise model of t=
he chain in the box&quot;. yes, probes to measure lots
 and lots of stuff in the boxes exist but again, those are chip/<span class=
=3D"gmail-m_-1289438270283603598gmail-m6484870522220906gmail-m-175728823075=
4630308gmail-m2484166253138266685spelle">linecard</span>/backplane/chassis/=
routing engine specific and mostly used in complex test/<span class=3D"gmai=
l-m_-1289438270283603598gmail-m6484870522220906gmail-m-1757288230754630308g=
mail-m2484166253138266685spelle">peformance</span>
 scenarios and not to derive some kind of equations that can predict anythi=
ng much ...
</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">[Bruno] Good points.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">Yet, one of the information that we propose to adver=
tise by the LSP receiver to the LSP sender is the Receive Window.</span><u>=
</u><u></u></p>
<p class=3D"gmail-m_-1289438270283603598gmail-m6484870522220906gmail-m-1757=
288230754630308gmail-m2484166253138266685msolistparagraph" style=3D"margin-=
left:106.2pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">-</span><span lang=3D"EN-US" style=3D"font-size:7pt;=
color:rgb(31,73,125)">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0
</span><span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,san=
s-serif;color:rgb(31,73,125)">This is a very common parameter and algorithm=
. Nothing fancy nor reinvented. In particular it=E2=80=99s a parameter used=
 by TCP.</span><u></u><u></u></p>
<p class=3D"gmail-m_-1289438270283603598gmail-m6484870522220906gmail-m-1757=
288230754630308gmail-m2484166253138266685msolistparagraph" style=3D"margin-=
left:106.2pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">-</span><span lang=3D"EN-US" style=3D"font-size:7pt;=
color:rgb(31,73,125)">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0
</span><span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,san=
s-serif;color:rgb(31,73,125)">I would argue that TCP implementations also r=
un on a variety of hardware and systems, must wider range than IS-IS platfo=
rm. And those
 TCP implementations on all those platform manage to advertise this paramet=
er (TCP window)</span><u></u><u></u></p>
<p class=3D"gmail-m_-1289438270283603598gmail-m6484870522220906gmail-m-1757=
288230754630308gmail-m2484166253138266685msolistparagraph" style=3D"margin-=
left:106.2pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">-</span><span lang=3D"EN-US" style=3D"font-size:7pt;=
color:rgb(31,73,125)">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0
</span><span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,san=
s-serif;color:rgb(31,73,125)">I fail to understand that when some WG contri=
butors proposed the use of TCP, nobody said that determining and advertisin=
g a Receive Window
 would be an issue, difficult or even impossible. But when we propose to ad=
vertise a Receive Window in an IS-IS TLV, this becomes difficult or even im=
possible for some platforms. Can anyone help me understand the technical di=
fference?</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:141.6pt">
<span lang=3D"EN-US">=C2=A0</span><u></u><u></u></p>
</div>
</div>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
Bruno, I was waiting for that ;-)<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt;text-indent:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">[Bruno2] Good ;-)</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt;text-indent:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
<span lang=3D"EN-US">Discounted for the fact that I&#39;m not a major TCP e=
xpert: TCP is a very different beast. it has a 100-200msec fast timer &amp;=
 500msec slow (which have to be quite accurate, it&#39;s really one timer f=
or all connections=C2=A0+
<span class=3D"gmail-m_-1289438270283603598gmail-m6484870522220906gmail-m-1=
757288230754630308spelle">mbuf</span> and other magic) and it sends a _lot_=
 of packets back and forth with window size indications so the negotiation =
can happen very quickly.=C2=A0
</span><span class=3D"gmail-m_-1289438270283603598gmail-m6484870522220906gm=
ail-m-1757288230754630308spelle">Also</span>, TCP
<span class=3D"gmail-m_-1289438270283603598gmail-m6484870522220906gmail-m-1=
757288230754630308spelle">can</span>
<span class=3D"gmail-m_-1289438270283603598gmail-m6484870522220906gmail-m-1=
757288230754630308spelle">detect</span> losses based on sequence number rec=
eived contrary to routing protocols (that&#39;s one of the things we added =
in RIFT BTW) and it can retransmit quickly when it sees a &quot;hole&quot;.
 Contrary to that in ISIS ACKs may or may not come, they may be bundled, he=
llos may or may not come and we can&#39;t retransmit stuff on 100msec timer=
s either. It&#39;s an utterly different transport channel.
<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt;text-indent:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">[Bruno2] I would distinguish two things, which I thi=
nk we have done in
<a href=3D"https://tools.ietf.org/html/draft-decraene-lsr-isis-flooding-spe=
ed-03" target=3D"_blank">
https://tools.ietf.org/html/draft-decraene-lsr-isis-flooding-speed-03</a></=
span><u></u><u></u></p>
<p class=3D"gmail-m_-1289438270283603598gmail-m6484870522220906gmail-m-1757=
288230754630308msolistparagraph" style=3D"margin-left:124.2pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">-</span><span lang=3D"EN-US" style=3D"font-size:7pt;=
color:rgb(31,73,125)">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0
</span><span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,san=
s-serif;color:rgb(31,73,125)">How fast you can adapt the sending rate. This=
 seems mostly dependent on the speed of the feedback loop, rather than the =
format of message.
 E.g. In IS-IS the receiver can give a feedback more or less quickly (e.g. =
depending on how fast/bundled it sends the PSNP). In theory, I don=E2=80=99=
t see a major different. From an in implementation standpoint, I=E2=80=99m =
guessing that the difference is probably bigger
 (e.g. TCP is probably lower level/closer to the system/hardware, than IS-I=
S which is more user space and possibly Platform Independent in some organi=
zations))</span><u></u><u></u></p>
<p class=3D"gmail-m_-1289438270283603598gmail-m6484870522220906gmail-m-1757=
288230754630308msolistparagraph" style=3D"margin-left:124.2pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">-</span><span lang=3D"EN-US" style=3D"font-size:7pt;=
color:rgb(31,73,125)">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0
</span><span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,san=
s-serif;color:rgb(31,73,125)">How fast you can detect packet loss. I agree =
that TCP &amp; IS-IS are very different on this. We have proposed to improv=
e this by allowing
 the receiver to advertise to the sender how fast it will <span class=3D"gm=
ail-m_-1289438270283603598gmail-m6484870522220906gmail-m-175728823075463030=
8spelle">
ack</span> the LSP. Currently the timer/behavior is known to receiver but n=
o to the sender. Hence the sender needs to assume the wort case (ISO defaul=
t).</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
<span lang=3D"EN-US">=C2=A0</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
<span lang=3D"EN-US">In more abstract terms, TCP is a sliding N-window
</span><span class=3D"gmail-m_-1289438270283603598gmail-m6484870522220906gm=
ail-m-1757288230754630308spelle">protocol</span> (<span class=3D"gmail-m_-1=
289438270283603598gmail-m6484870522220906gmail-m-1757288230754630308spelle"=
>where</span> N
<span class=3D"gmail-m_-1289438270283603598gmail-m6484870522220906gmail-m-1=
757288230754630308spelle">is</span> <span class=3D"gmail-m_-128943827028360=
3598gmail-m6484870522220906gmail-m-1757288230754630308spelle">
adjusted</span> all the time &amp; <span class=3D"gmail-m_-1289438270283603=
598gmail-m6484870522220906gmail-m-1757288230754630308spelle">
losses</span> <span class=3D"gmail-m_-1289438270283603598gmail-m64848705222=
20906gmail-m-1757288230754630308spelle">
can</span> <span class=3D"gmail-m_-1289438270283603598gmail-m64848705222209=
06gmail-m-1757288230754630308spelle">
be</span> <span class=3D"gmail-m_-1289438270283603598gmail-m648487052222090=
6gmail-m-1757288230754630308spelle">
efficiently</span> <span class=3D"gmail-m_-1289438270283603598gmail-m648487=
0522220906gmail-m-1757288230754630308spelle">
detected</span>) <span class=3D"gmail-m_-1289438270283603598gmail-m64848705=
22220906gmail-m-1757288230754630308spelle">
whereas</span> LSR <span class=3D"gmail-m_-1289438270283603598gmail-m648487=
0522220906gmail-m-1757288230754630308spelle">
flooding</span> <span class=3D"gmail-m_-1289438270283603598gmail-m648487052=
2220906gmail-m-1757288230754630308spelle">
is</span> not a <span class=3D"gmail-m_-1289438270283603598gmail-m648487052=
2220906gmail-m-1757288230754630308spelle">
windowing</span> <span class=3D"gmail-m_-1289438270283603598gmail-m64848705=
22220906gmail-m-1757288230754630308spelle">
protocol</span> (or <span class=3D"gmail-m_-1289438270283603598gmail-m64848=
70522220906gmail-m-1757288230754630308spelle">
rather</span> LSDB-size <span class=3D"gmail-m_-1289438270283603598gmail-m6=
484870522220906gmail-m-1757288230754630308spelle">
window</span> <span class=3D"gmail-m_-1289438270283603598gmail-m64848705222=
20906gmail-m-1757288230754630308spelle">
protocol</span> <span class=3D"gmail-m_-1289438270283603598gmail-m648487052=
2220906gmail-m-1757288230754630308spelle">
with</span> <span class=3D"gmail-m_-1289438270283603598gmail-m6484870522220=
906gmail-m-1757288230754630308spelle">
selective</span> retransmission but no <span class=3D"gmail-m_-128943827028=
3603598gmail-m6484870522220906gmail-m-1757288230754630308spelle">
detection</span> of <span class=3D"gmail-m_-1289438270283603598gmail-m64848=
70522220906gmail-m-1757288230754630308spelle">
loss</span> [or <span class=3D"gmail-m_-1289438270283603598gmail-m648487052=
2220906gmail-m-1757288230754630308spelle">
only</span> <span class=3D"gmail-m_-1289438270283603598gmail-m6484870522220=
906gmail-m-1757288230754630308spelle">
very</span> slow <span class=3D"gmail-m_-1289438270283603598gmail-m64848705=
22220906gmail-m-1757288230754630308spelle">
based</span> on <span class=3D"gmail-m_-1289438270283603598gmail-m648487052=
2220906gmail-m-1757288230754630308spelle">
lack</span> of ACK &amp; <span class=3D"gmail-m_-1289438270283603598gmail-m=
6484870522220906gmail-m-1757288230754630308spelle">
CSNPs</span>]). Disadvantage of something like TCP (I think I sent out the =
RFC with UDP control protocol work to make it more TCP like)
<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt;text-indent:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">[Bruno2] =C2=A0If you are referring to DCCP (Datagra=
m Congestion Control Protocol) (RFC 4340), yes you did and thank you for th=
is. Constructive feedback.</span><u></u><u></u></p>
<p class=3D"gmail-m_-1289438270283603598gmail-m6484870522220906gmail-m-1757=
288230754630308msolistparagraph" style=3D"margin-left:124.2pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">-</span><span lang=3D"EN-US" style=3D"font-size:7pt;=
color:rgb(31,73,125)">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0
</span><span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,san=
s-serif;color:rgb(31,73,125)">Regarding flow control, I=E2=80=99ve quickly =
looked at DCCP and it does not provides flow control.</span><u></u><u></u><=
/p>
<p class=3D"gmail-m_-1289438270283603598gmail-m6484870522220906gmail-m-1757=
288230754630308msolistparagraph" style=3D"margin-left:124.2pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">-</span><span lang=3D"EN-US" style=3D"font-size:7pt;=
color:rgb(31,73,125)">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0
</span><span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,san=
s-serif;color:rgb(31,73,125)">Regarding congestion control, possibly the al=
gorithm part may be reused. There are two
<span class=3D"gmail-m_-1289438270283603598gmail-m6484870522220906gmail-m-1=
757288230754630308spelle">algo</span> and DCCP is open to others. May be on=
e question is how much we want IS-IS to be fair to TCP (control plane TCP, =
not
<span class=3D"gmail-m_-1289438270283603598gmail-m6484870522220906gmail-m-1=
757288230754630308spelle">dataplane</span>/user plane TCP). To me, IS-IS is=
 more important than BGP traffic, given their relative importance to the ne=
twork, their delay requirements, their typical volume of traffic.
 But that is probably a =E2=80=9Cdetail=E2=80=9D down the road. This is als=
o depends on whether TCP &amp; IS-IS compete for the same resources (e.g. s=
ame queue) or not (ideally TCP and IS-IS have different queues).</span><u><=
/u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt;text-indent:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
<span lang=3D"EN-US">is that you are stuck when you put something into the =
pipe, no prioritization possible and if receiver is slow you may have multi=
ple obsolete copies in the pipe waiting &amp; lots retransmission BW when h=
oles are
 punched into the data through loss. </span>And plain TCP=C2=A0 <span class=
=3D"gmail-m_-1289438270283603598gmail-m6484870522220906gmail-m-175728823075=
4630308spelle">
is</span> actually quite bad for control protocol traffic @ scale, almost a=
ll vendor run special version of it for BGP for that reason. Why that is is=
 out of scope of this list I think ... Flooding is really good to send lots=
 of data prioritized/in parallel
 but on <span class=3D"gmail-m_-1289438270283603598gmail-m6484870522220906g=
mail-m-1757288230754630308spelle">losses</span>
<span class=3D"gmail-m_-1289438270283603598gmail-m6484870522220906gmail-m-1=
757288230754630308spelle">re</span>-TX
<span class=3D"gmail-m_-1289438270283603598gmail-m6484870522220906gmail-m-1=
757288230754630308spelle">is</span> slow.<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt;text-indent:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">[Bruno2] Good that we seem to make the same distinct=
ion between the control loops for the sending rate vs the retransmission.</=
span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt;text-indent:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">Regarding clarifying distinctions, draft may need to=
 better introduce the distinction between flow control and congestion contr=
ol, at least
 to structure the work and the discussion.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt;text-indent:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt;text-indent:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">Thanks</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:70.8pt;text-indent:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">--Bruno</span><u></u><u></u></p>
</div>
<blockquote style=3D"border-left:1pt solid rgb(204,204,204);padding:0cm 0cm=
 0cm 6pt;margin:5pt 0cm 5pt 4.8pt;border-top:currentcolor;border-right:curr=
entcolor;border-bottom:currentcolor">
<div>
<div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:141.6pt">
<span lang=3D"EN-US">Bruno, if you&#39;re so deeply interested in that stuf=
f we can talk 1:1 off-line about implementation work on rift towards
<span class=3D"gmail-m_-1289438270283603598gmail-m6484870522220906gmail-m-1=
757288230754630308gmail-m2484166253138266685spelle">
adapatable</span> flooding rate</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">[Bruno] Sure. My pleasure. Please propose me some ti=
meslot offline. Please note that I=E2=80=99m based in Europe (CEST), so a p=
riori during your morning
 and my evening.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">If you can also extend the offer to discuss the impl=
ementation work on the IS-IS implementation of your employer with regards t=
o adaptable flooding
 rate, and/or how network operator can configure the CLI parameters of the =
LSP senders so as to improve flooding rate without overloading the Juniper =
receiver (possibly depending on the capability of the receiver, its number =
of IS-IS neighbors=E2=80=A6 and/or whatever
 parameter that you feel are relevant) that would be most appreciated. And =
if you believe that the Juniper LSP receiver can handle any rate from any r=
easonable (e.g. 50) =C2=A0number of IGP neighbors, without (significantly) =
dropping the received LSPs, that would
 be even simpler, please advise.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:141.6pt">
<span lang=3D"EN-US">=C2=A0</span><u></u><u></u></p>
</div>
</div>
</div>
</div>
</blockquote>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
ping me for that 1:1 on company email pls <u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:106.2pt">
-- tony <u></u><u></u></p>
</div>
</div>
</div>
<pre style=3D"margin-left:70.8pt">_________________________________________=
___________________________________________________________________________=
_____<u></u><u></u></pre>
<pre style=3D"margin-left:70.8pt">=C2=A0<u></u><u></u></pre>
<pre style=3D"margin-left:70.8pt">Ce message et ses pieces jointes peuvent =
contenir des informations confidentielles ou privilegiees et ne doivent don=
c<u></u><u></u></pre>
<pre style=3D"margin-left:70.8pt">pas etre diffuses, exploites ou copies sa=
ns autorisation. Si vous avez recu ce message par erreur, veuillez le signa=
ler<u></u><u></u></pre>
<pre style=3D"margin-left:70.8pt">a l&#39;expediteur et le detruire ainsi q=
ue les pieces jointes. Les messages electroniques etant susceptibles d&#39;=
alteration,<u></u><u></u></pre>
<pre style=3D"margin-left:70.8pt">Orange decline toute responsabilite si ce=
 message a ete altere, deforme ou falsifie. Merci.<u></u><u></u></pre>
<pre style=3D"margin-left:70.8pt">=C2=A0<u></u><u></u></pre>
<pre style=3D"margin-left:70.8pt">This message and its attachments may cont=
ain confidential or privileged information that may be protected by law;<u>=
</u><u></u></pre>
<pre style=3D"margin-left:70.8pt">they should not be distributed, used or c=
opied without authorisation.<u></u><u></u></pre>
<pre style=3D"margin-left:70.8pt">If you have received this email in error,=
 please notify the sender and delete this message and its attachments.<u></=
u><u></u></pre>
<pre style=3D"margin-left:70.8pt">As emails may be altered, Orange is not l=
iable for messages that have been modified, changed or falsified.<u></u><u>=
</u></pre>
<pre style=3D"margin-left:70.8pt">Thank you.<u></u><u></u></pre>
</div>
</blockquote>
</div>
</div>
<pre style=3D"margin-left:35.4pt">_________________________________________=
___________________________________________________________________________=
_____<u></u><u></u></pre>
<pre style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></pre>
<pre style=3D"margin-left:35.4pt">Ce message et ses pieces jointes peuvent =
contenir des informations confidentielles ou privilegiees et ne doivent don=
c<u></u><u></u></pre>
<pre style=3D"margin-left:35.4pt">pas etre diffuses, exploites ou copies sa=
ns autorisation. Si vous avez recu ce message par erreur, veuillez le signa=
ler<u></u><u></u></pre>
<pre style=3D"margin-left:35.4pt">a l&#39;expediteur et le detruire ainsi q=
ue les pieces jointes. Les messages electroniques etant susceptibles d&#39;=
alteration,<u></u><u></u></pre>
<pre style=3D"margin-left:35.4pt">Orange decline toute responsabilite si ce=
 message a ete altere, deforme ou falsifie. Merci.<u></u><u></u></pre>
<pre style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></pre>
<pre style=3D"margin-left:35.4pt">This message and its attachments may cont=
ain confidential or privileged information that may be protected by law;<u>=
</u><u></u></pre>
<pre style=3D"margin-left:35.4pt">they should not be distributed, used or c=
opied without authorisation.<u></u><u></u></pre>
<pre style=3D"margin-left:35.4pt">If you have received this email in error,=
 please notify the sender and delete this message and its attachments.<u></=
u><u></u></pre>
<pre style=3D"margin-left:35.4pt">As emails may be altered, Orange is not l=
iable for messages that have been modified, changed or falsified.<u></u><u>=
</u></pre>
<pre style=3D"margin-left:35.4pt">Thank you.<u></u><u></u></pre>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt">_______________________=
________________________<br>
Lsr mailing list<br>
<a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr" target=3D"_blank">htt=
ps://www.ietf.org/mailman/listinfo/lsr</a><u></u><u></u></p>
</blockquote>
</div>
</div>
<pre>______________________________________________________________________=
___________________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l&#39;expediteur et le detruire ainsi que les pieces jointes. Les message=
s electroniques etant susceptibles d&#39;alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.
Thank you.
</pre></div>

</blockquote></div>

--0000000000009730e205a442e7cb--


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From: <bruno.decraene@orange.com>
To: Robert Raszuk <robert@raszuk.net>
CC: Tony Przygienda <tonysietf@gmail.com>, "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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Date: Mon, 27 Apr 2020 12:14:49 +0000
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "bruno.decraene@orange.com" <bruno.decraene@orange.com>, Robert Raszuk <robert@raszuk.net>
CC: "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, Tony Przygienda <tonysietf@gmail.com>
Thread-Topic: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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To: "Acee Lindem (acee)" <acee@cisco.com>
CC: "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, Robert Raszuk <robert@raszuk.net>, "Tony Przygienda" <tonysietf@gmail.com>
Thread-Topic: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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Date: Mon, 27 Apr 2020 13:02:45 +0000
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Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "bruno.decraene@orange.com" <bruno.decraene@orange.com>
CC: "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, Robert Raszuk <robert@raszuk.net>, "Tony Przygienda" <tonysietf@gmail.com>
Thread-Topic: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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From: Robert Raszuk <robert@raszuk.net>
Date: Mon, 27 Apr 2020 16:38:55 +0200
Message-ID: <CAOj+MMGENdGn-FB5GwkhsMZsTm_gQSYYmaGCyLy=5nAnCtvSRA@mail.gmail.com>
To: Bruno Decraene <bruno.decraene@orange.com>
Cc: "Acee Lindem (acee)" <acee@cisco.com>,  "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, Tony Przygienda <tonysietf@gmail.com>
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Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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> In both cases, this call, IMO a signaling capability from the receiver to
the sender.

So essentially you are asking for per peer flooding queue.

Now this get's a little bit of tricky (especially if you are dealing
with relatively small timers) if one peer sends you 1 ms, second 50 ms and
10th  250 ms.

Imagine that the LSP to be flooded to the 10th peer is already overwritten
due to new LSP but still sitting in the out queue ... do you drain that
queue and start over with new LSP or you in place replace the old one
keeping the running timer ?

I am just curious what will happen under the hood :)

Cheers,
R.




On Mon, Apr 27, 2020 at 3:02 PM <bruno.decraene@orange.com> wrote:

> Hi Acee,
>
>
>
> Please see inline [Bruno2]
>
>
>
> *From:* Acee Lindem (acee) [mailto:acee@cisco.com]
> *Sent:* Monday, April 27, 2020 2:39 PM
> *To:* DECRAENE Bruno TGI/OLN; Robert Raszuk
> *Cc:* Les Ginsberg (ginsberg); lsr@ietf.org; Tony Przygienda
> *Subject:* Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
>
>
>
> Hi Bruno,
>
>
>
> *From: *Lsr <lsr-bounces@ietf.org> on behalf of Bruno Decraene <
> bruno.decraene@orange.com>
> *Date: *Monday, April 27, 2020 at 8:15 AM
> *To: *Robert Raszuk <robert@raszuk.net>
> *Cc: *"Les Ginsberg (ginsberg)" <ginsberg=3D40cisco.com@dmarc.ietf.org>, =
"
> lsr@ietf.org" <lsr@ietf.org>, Tony Przygienda <tonysietf@gmail.com>
> *Subject: *Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
>
>
>
> Robert,
>
>
>
> *From:* Robert Raszuk [mailto:robert@raszuk.net]
> *Sent:* Monday, April 27, 2020 12:09 PM
> *To:* DECRAENE Bruno TGI/OLN
> *Cc:* Tony Przygienda; Les Ginsberg (ginsberg); lsr@ietf.org
> *Subject:* Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
>
>
>
>
>
> > Slow flooding increase the likelihood of multiple IGP SPF computations
>
>
>
> True.
>
>
>
> But if you keep your IGP nicely organized in area and levels, get rid of
> flooding anything incl. /32s domain wide to address bugs in MPLS
> architecture then your flooding radius is usually very small.
>
> [Bruno] First of all, the use of areas/levels brings tradeoffs. Then,
> after their initial design, networks grow and change.
>
>
>
> Coming back to flooding, if you have a core router with 50 IGP neighbors,
> the failure of this neighbor requires flooding 50 LSPs. At 33ms pacing
> between LSPs that=E2=80=99s a 1.6s delay/tax, before any computation & FI=
B update.
> As you see, it=E2=80=99s not related to the number of /32 nor the network=
 diameter.
>
> Some may be fine with this additional 1.6s. Some may not.
>
>
>
> I=E2=80=99m not nearly as familiar with IS-IS deployments as OSPF. Are th=
ere any
> implementations that don=E2=80=99t offer configuration to override the 33=
ms
> inter-LSP interval?
>
> [Bruno2] AFAIK, all implementations allow the configuration of the
> inter-LSP interval.
>
> The question is which value do you set while not risking to overload your
> IS-IS neighbor. Which brings two issues:
>
> -          This depends on the receiver. E.g. High end router vs low end;
> PE with only 2 high adjacencies vs P with 50 adjacencies, router
> generation=E2=80=A6 While this is currently configured on the sender on a=
 per
> receiver basis
>
> -          Even though the vendor know the design and how it is
> implemented, some vendors may not commit on scaling values supported by a
> given receiver.
>
>
>
> So there are two options:
>
> -          Have the receiver advertise static values (default but
> according to its platform capability=3D
>
> -          Use dynamic values. Flow control is likely to also require
> some signaling from the receiver to the sender.
>
>
>
> In both cases, this call, IMO a signaling capability from the receiver to
> the sender. The same signaling may then be used to advertise either
> static/default or dynamic values, depending on what the receiver prefer
> (some tend to prefer static values, some tend to prefer dynamic values)
>
>
>
> Thanks,
>
> BR
>
> --Bruno
>
> At Redback (circa 2000), our OSPF implementation defaulted to fast
> flooding and for the MinLSInterval and MinLSArrival OSPF values, you had =
to
> explicitly remove the fast flooding default if  you wanted to follow RFC
> 2328. Thanks,
> Acee
>
>
>
> Best
>
> --Bruno
>
>
>
>
>
> That in turn allows for both fast flooding and fast topology computation
> while only dealing with few external summaries. I am yet to see a
> practical case where a well designed network with today's ISIS requires
> flooding speedup.
>
>
>
> Best,
>
> R.
>
>
>
>
>
>
>
>
>
> On Mon, Apr 27, 2020 at 10:34 AM <bruno.decraene@orange.com> wrote:
>
> =C3=98  ISIS flooding churn (and room for optimization) becomes a problem=
 when
> node boots up (IMHO this is not a problem) and when node fails while havi=
ng
> many neighbors attached. Yes maybe second case could be improved but well
> designed and operated network should have pre-programmed bypass paths
> against such cases so IMO stressing IGP to "converge" faster while great =
in
> principle may not be really needed in practice.
>
>
>
> I don=E2=80=99t think that FRR is a replacement for =E2=80=9Cfast=E2=80=
=9D (I=E2=80=99d rather say
> adequate) IGP convergence & flooding.
>
> For multiple reasons such as:
>
> -          Multiple =E2=80=98things=E2=80=99 depends on the IGP, such as =
BGP best path
> selection, CSPF/TE/PCE computations, FRR computations
>
> -          Slow flooding increase the likelihood of multiple IGP SPF
> computations which is harmful for other computations which are typically
> heavier and manifolds (cf above)
>
> -          Multiple IGP SPF computations also create multiple transient
> forwarding loops. There are some techniques to remove forwarding loops bu=
t
> this is still an advanced topic and some implementations do not handle
> consecutives IGP SPF (with =E2=80=98overlapping=E2=80=99 convergences and=
 combined
> distributed forwarding loops)
>
> -          For FRR, you mostly need to pre-decide/configure whether you
> want to protect link or node failures. Tradeoff are involved and given
> probability of events, link protection is usually enabled (hence not node
> protection)
>
> -          =E2=80=A6
>
>
>
> Also, given the current =E2=80=9Cstate of the art=E2=80=9D, there is no s=
tressing
> involved. Really. Using TCP, my 200=E2=82=AC mobile running on battery an=
d over
> wifi+ADSL+Internet can achieve better communication throughput than a
> n*100k=E2=82=AC high end IS-IS router.
>
> I think many persons agree that IS-IS could do better in term of flooding=
.
> (possibly not as good as a brand new approach, but incremental improvemen=
t
> also have some benefits). Eventually, we don=E2=80=99t need everyone to a=
gree on
> this.
>
>
>
> =C3=98  PS. Does anyone have a pointer to any real data showing that
> performance of real life WAN ISIS deployments is bad ?
>
>
>
> In some of our ASes, we do monitor IS-IS by listening to and recording
> flooded LSPs. I can=E2=80=99t share any data.
>
> Next question could be what is =E2=80=9Cgood enough=E2=80=9D. I guess thi=
s may depend on
> the size of your network, its topology, and your requirements.
>
>
>
> We also ran tests in labs. I may share some results during my
> presentation. (no names, possibly no KPI, but some high level outcomes).
>
>
>
> Regards,
>
> Bruno
>
>
>
>
>
> *From**:* Robert Raszuk [mailto:robert@raszuk.net]
> *Sent:* Friday, April 24, 2020 12:42 PM
> *To:* DECRAENE Bruno TGI/OLN
> *Cc:* Tony Przygienda; Les Ginsberg (ginsberg); lsr@ietf.org
> *Subject:* Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
>
>
>
> Hi Bruno  & all,
>
>
>
> [Bruno] On my side, I=E2=80=99ll try once and I think the LSR WG should a=
lso try
> to improve IS-IS performance. May be if we want to move, we should first
> release the brakes.
>
>
>
> Well from my observations releasing the breaks means increasing the risks=
.
>
>
>
> Take BGP - breaks are off and see what happens :)
>
>
>
> My personal observation is that ISIS implementations across vendors are
> just fine for vast majority of deployments today. That actually also
> includes vast majority of compute clusters as they consists of max 10s of
> racks.
>
>
>
> Of course there are larger clusters with 1000+ or 10K and above network
> elements itself and x 20 L3 computes, but is there really a need to stret=
ch
> protocol to accommodate those ? Those usually run BGP anyway. And also
> there is DV+LS hybrid too now.
>
>
>
> ISIS flooding churn (and room for optimization) becomes a problem when
> node boots up (IMHO this is not a problem) and when node fails while havi=
ng
> many neighbors attached. Yes maybe second case could be improved but well
> designed and operated network should have pre-programmed bypass paths
> against such cases so IMO stressing IGP to "converge" faster while great =
in
> principle may not be really needed in practice.
>
>
>
> Last I am worried that when IETF defines changes to core protocol
> behaviour the quality of the implementations of those changes may really
> differ across vendors overall resulting in much worse performance and
> stability as compared to where we are today.
>
>
>
> I am just not sure if possible gains for few deployments are greater
> then risk for 1000s of today's deployments. Maybe one size does not fit a=
ll
> and for massive scale ISIS we should define a notion of "ISIS-DC-PLUGIN"
> which can be optionally in run time added when/if needed. If that require=
s
> protocol changes to accommodate such dynamic plugins - that work should
> take place.
>
>
>
> Many thx,
>
> R.
>
>
>
> PS. Does anyone have a pointer to any real data showing that performance
> of real life WAN ISIS deployments is bad ?
>
>
>
>
>
> On Fri, Apr 24, 2020 at 11:26 AM <bruno.decraene@orange.com> wrote:
>
> Tony
>
>
>
> *From:* Tony Przygienda [mailto:tonysietf@gmail.com]
> *Sent:* Thursday, April 23, 2020 7:29 PM
> *To:* DECRAENE Bruno TGI/OLN
> *Cc:* lsr@ietf.org; Les Ginsberg (ginsberg)
> *Subject:* Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
>
>
>
> I was refering to RFC4960. Bruno, for all practical purposes I think that
> seems to go down the path of trying to reinvent RFC4960 (or ultimately us=
e
> it).
>
> [Bruno] I don=E2=80=99t think that SCTP (RC4960) is a better fit than TCP=
. Many
> more features and options than TCP, way more than needed given existing
> IS-IS flooding mechanism. Much less implementations experience and
> improvement than TCP.
>
> Or, changing the packet formats heavily to incorporate all the control
> loop data you need to the point you have a different control channel alon=
g
> those lines since you'll find most of the problems RFC4960 is describing
> (minus stuff like multiple paths).
>
> [Bruno] Really, adding one sub-TLV in IS-IS is not =E2=80=9Cchanging the =
packet
> formats heavily=E2=80=9D.
>
> Nothing wrong with that but it's ambitious on a 30 years old anitque
> artefact we're nursing forward here ;-)
>
> [Bruno] I=E2=80=99m perfectly fine with revolution approaches. I think th=
at we can
> also provide incremental improvement to IS-IS.
>
> As entertaining footnote, I saw in last 20 years at least 3 attempts to
> allow multiple TCP sessions in BGP between peers to speed/prioritize thin=
gs
> up. All failed, after the first one I helped to push I smarted up ;-)
>
>  [Bruno] On my side, I=E2=80=99ll try once and I think the LSR WG should =
also try
> to improve IS-IS performance. May be if we want to move, we should first
> release the brakes. I=E2=80=99m seen some progress, e.g., from =E2=80=9Ct=
here is no need to
> improve flooding=E2=80=9D to =E2=80=9Cwe all agree to improve flooding=E2=
=80=9D, or from =E2=80=9CNetwork
> operator just need to configure existing CLI=E2=80=9D to =E2=80=9CWe agre=
e that we need
> something more automated/dynamic=E2=80=9D. But this has been very slow pr=
ogress
> over a year.
>
>
>
> --Bruno
>
>
>
> As another footnote: I looked @ all the stuff in RIFT (tcp, quic, 4960,
> more ephemeral stuff). I ended up adding to rift bunch very rudimentary
> things and do roughly what Les/Peter/Acee started to write (modulo algori=
th
> I contributed and bunch things that would be helpful but we can't fit int=
o
> existing packet format). This was as much decision as to "what's availabl=
e
> & well debugged" as well as "does it meet requirements" as "how complex i=
s
> that vs. rtx in flooding architecture  we have today + some feedback". No=
t
> on powerpoint, in real production code ;-) rift draft shows you the outco=
me
> of that as IMO best trade-off to achieve high flooding speeds ;-)
>
>
>
> my 2c
>
>
>
> -- tony
>
>
>
> On Thu, Apr 23, 2020 at 10:15 AM <bruno.decraene@orange.com> wrote:
>
> Tony,
>
> Thanks for engaging.
>
> Please inline [Bruno2]
>
>
>
>
>
>
>
> *From:* Tony Przygienda [mailto:tonysietf@gmail.com]
> *Sent:* Wednesday, April 22, 2020 9:25 PM
> *To:* DECRAENE Bruno TGI/OLN
> *Cc:* lsr@ietf.org; Les Ginsberg (ginsberg)
> *Subject:* Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
>
>
>
>
>
>
>
> On Wed, Apr 22, 2020 at 11:03 AM <bruno.decraene@orange.com> wrote:
>
> Tony, all,
>
>
>
> Thanks Tony for the technical and constructive feedback.
>
> Please inline [Bruno]
>
>
>
> *From:* Tony Przygienda [mailto:tonysietf@gmail.com]
> *Sent:* Wednesday, April 22, 2020 1:19 AM
> *To:* Les Ginsberg (ginsberg)
> *Cc:* DECRAENE Bruno TGI/OLN; lsr@ietf.org
> *Subject:* Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
>
>
>
> neither am I aware of anything like this (i.e. per platform/product
> flooding rate constants) in any major vendor stack for whatever that's
> worth. It's simply unmaintanable, point. All major vendors have extensive
> product lines over so many changing hardware configuration/setups it is
> simply not viable to attempt precise measurements (and even then, user
> changing config can throw the stuff off in a millisecond). There may have
> been here and there per deployment scenario some "recommended config"
> (not something I immediately recall either) but that means very fixed
> configuration of things & how they go into networks and even then I'm not
> aware of anyone having had a "precise model of the chain in the box". yes=
,
> probes to measure lots and lots of stuff in the boxes exist but again,
> those are chip/linecard/backplane/chassis/routing engine specific and
> mostly used in complex test/peformance scenarios and not to derive some
> kind of equations that can predict anything much ...
>
> [Bruno] Good points.
>
> Yet, one of the information that we propose to advertise by the LSP
> receiver to the LSP sender is the Receive Window.
>
> -          This is a very common parameter and algorithm. Nothing fancy
> nor reinvented. In particular it=E2=80=99s a parameter used by TCP.
>
> -          I would argue that TCP implementations also run on a variety
> of hardware and systems, must wider range than IS-IS platform. And those
> TCP implementations on all those platform manage to advertise this
> parameter (TCP window)
>
> -          I fail to understand that when some WG contributors proposed
> the use of TCP, nobody said that determining and advertising a Receive
> Window would be an issue, difficult or even impossible. But when we propo=
se
> to advertise a Receive Window in an IS-IS TLV, this becomes difficult or
> even impossible for some platforms. Can anyone help me understand the
> technical difference?
>
>
>
>
>
> Bruno, I was waiting for that ;-)
>
> [Bruno2] Good ;-)
>
>
>
> Discounted for the fact that I'm not a major TCP expert: TCP is a very
> different beast. it has a 100-200msec fast timer & 500msec slow (which ha=
ve
> to be quite accurate, it's really one timer for all connections + mbuf
> and other magic) and it sends a _lot_ of packets back and forth with wind=
ow
> size indications so the negotiation can happen very quickly.  Also, TCP
> can detect losses based on sequence number received contrary to routing
> protocols (that's one of the things we added in RIFT BTW) and it can
> retransmit quickly when it sees a "hole". Contrary to that in ISIS ACKs m=
ay
> or may not come, they may be bundled, hellos may or may not come and we
> can't retransmit stuff on 100msec timers either. It's an utterly differen=
t
> transport channel.
>
> [Bruno2] I would distinguish two things, which I think we have done in
> https://tools.ietf.org/html/draft-decraene-lsr-isis-flooding-speed-03
>
> -          How fast you can adapt the sending rate. This seems mostly
> dependent on the speed of the feedback loop, rather than the format of
> message. E.g. In IS-IS the receiver can give a feedback more or less
> quickly (e.g. depending on how fast/bundled it sends the PSNP). In theory=
,
> I don=E2=80=99t see a major different. From an in implementation standpoi=
nt, I=E2=80=99m
> guessing that the difference is probably bigger (e.g. TCP is probably low=
er
> level/closer to the system/hardware, than IS-IS which is more user space
> and possibly Platform Independent in some organizations))
>
> -          How fast you can detect packet loss. I agree that TCP & IS-IS
> are very different on this. We have proposed to improve this by allowing
> the receiver to advertise to the sender how fast it will ack the LSP.
> Currently the timer/behavior is known to receiver but no to the sender.
> Hence the sender needs to assume the wort case (ISO default).
>
>
>
> In more abstract terms, TCP is a sliding N-window protocol (where N is
> adjusted all the time & losses can be efficiently detected) whereas LSR
> flooding is not a windowing protocol (or rather LSDB-size window protocol
> with selective retransmission but no detection of loss [or only very slow
> based on lack of ACK & CSNPs]). Disadvantage of something like TCP (I
> think I sent out the RFC with UDP control protocol work to make it more T=
CP
> like)
>
> [Bruno2]  If you are referring to DCCP (Datagram Congestion Control
> Protocol) (RFC 4340), yes you did and thank you for this. Constructive
> feedback.
>
> -          Regarding flow control, I=E2=80=99ve quickly looked at DCCP an=
d it
> does not provides flow control.
>
> -          Regarding congestion control, possibly the algorithm part may
> be reused. There are two algo and DCCP is open to others. May be one
> question is how much we want IS-IS to be fair to TCP (control plane TCP,
> not dataplane/user plane TCP). To me, IS-IS is more important than BGP
> traffic, given their relative importance to the network, their delay
> requirements, their typical volume of traffic. But that is probably a
> =E2=80=9Cdetail=E2=80=9D down the road. This is also depends on whether T=
CP & IS-IS compete
> for the same resources (e.g. same queue) or not (ideally TCP and IS-IS ha=
ve
> different queues).
>
>
>
> is that you are stuck when you put something into the pipe, no
> prioritization possible and if receiver is slow you may have multiple
> obsolete copies in the pipe waiting & lots retransmission BW when holes a=
re
> punched into the data through loss. And plain TCP  is actually quite bad
> for control protocol traffic @ scale, almost all vendor run special versi=
on
> of it for BGP for that reason. Why that is is out of scope of this list I
> think ... Flooding is really good to send lots of data prioritized/in
> parallel but on losses re-TX is slow.
>
> [Bruno2] Good that we seem to make the same distinction between the
> control loops for the sending rate vs the retransmission.
>
> Regarding clarifying distinctions, draft may need to better introduce the
> distinction between flow control and congestion control, at least to
> structure the work and the discussion.
>
>
>
> Thanks
>
> --Bruno
>
> Bruno, if you're so deeply interested in that stuff we can talk 1:1
> off-line about implementation work on rift towards adapatable flooding
> rate
>
> [Bruno] Sure. My pleasure. Please propose me some timeslot offline. Pleas=
e
> note that I=E2=80=99m based in Europe (CEST), so a priori during your mor=
ning and
> my evening.
>
> If you can also extend the offer to discuss the implementation work on th=
e
> IS-IS implementation of your employer with regards to adaptable flooding
> rate, and/or how network operator can configure the CLI parameters of the
> LSP senders so as to improve flooding rate without overloading the Junipe=
r
> receiver (possibly depending on the capability of the receiver, its numbe=
r
> of IS-IS neighbors=E2=80=A6 and/or whatever parameter that you feel are r=
elevant)
> that would be most appreciated. And if you believe that the Juniper LSP
> receiver can handle any rate from any reasonable (e.g. 50)  number of IGP
> neighbors, without (significantly) dropping the received LSPs, that would
> be even simpler, please advise.
>
>
>
>
>
>
>
> ping me for that 1:1 on company email pls
>
>
>
> -- tony
>
> _________________________________________________________________________=
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>
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cu ce message par erreur, veuillez le signaler
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> a l'expediteur et le detruire ainsi que les pieces jointes. Les messages =
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>
>
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> a l'expediteur et le detruire ainsi que les pieces jointes. Les messages =
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>
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> This message and its attachments may contain confidential or privileged i=
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>
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n modified, changed or falsified.
>
> Thank you.
>
> _________________________________________________________________________=
________________________________________________
>
>
>
> Ce message et ses pieces jointes peuvent contenir des informations confid=
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________________________________________________
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> Ce message et ses pieces jointes peuvent contenir des informations confid=
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> pas etre diffuses, exploites ou copies sans autorisation. Si vous avez re=
cu ce message par erreur, veuillez le signaler
> a l'expediteur et le detruire ainsi que les pieces jointes. Les messages =
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> Orange decline toute responsabilite si ce message a ete altere, deforme o=
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--00000000000068386c05a446ad6a
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><span style=3D"color:rgb(31,73,125);font-family:Calibri,sa=
ns-serif;font-size:14.6667px">&gt; In both cases, this call, IMO a signalin=
g capability from the receiver to the sender.</span>=C2=A0=C2=A0<br><div><b=
r></div><div>So essentially you are asking for per peer flooding queue.=C2=
=A0</div><div><br></div><div>Now this get&#39;s a little bit of tricky (esp=
ecially if you are dealing with=C2=A0relatively small timers) if one peer s=
ends you 1 ms, second 50 ms and 10th=C2=A0 250 ms.=C2=A0</div><div><br></di=
v><div>Imagine that the LSP to be flooded to the 10th peer is already overw=
ritten due to new LSP but still sitting in the=C2=A0out queue ... do you dr=
ain that queue and start over with new LSP or you in place replace the old =
one keeping the running timer ?=C2=A0</div><div><br></div><div>I am just cu=
rious what will happen under the hood :)=C2=A0</div><div><br></div><div>Che=
ers,<br>R.</div><div><br></div><div><br></div><div><br></div></div><br><div=
 class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Apr 27=
, 2020 at 3:02 PM &lt;<a href=3D"mailto:bruno.decraene@orange.com">bruno.de=
craene@orange.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote"=
 style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);p=
adding-left:1ex">







<div lang=3D"FR">
<div class=3D"gmail-m_6270245679185823838WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif;color:rgb(31,73,125)">Hi Acee,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_6270245679185823838SpellE"><s=
pan style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,=
125)">Please</span></span><span style=3D"font-size:11pt;font-family:Calibri=
,sans-serif;color:rgb(31,73,125)">
<span class=3D"gmail-m_6270245679185823838SpellE">see</span> <span class=3D=
"gmail-m_6270245679185823838SpellE">inline</span> [Bruno2]<u></u><u></u></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></p>
<div>
<div style=3D"border-right:none;border-bottom:none;border-left:none;border-=
top:1pt solid rgb(181,196,223);padding:3pt 0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><b><span style=3D"font-=
size:10pt;font-family:Tahoma,sans-serif">From:</span></b><span style=3D"fon=
t-size:10pt;font-family:Tahoma,sans-serif">
 Acee Lindem (acee) [mailto:<a href=3D"mailto:acee@cisco.com" target=3D"_bl=
ank">acee@cisco.com</a>] <br>
<b>Sent:</b> Monday, April 27, 2020 2:39 PM<br>
<b>To:</b> DECRAENE Bruno TGI/OLN; Robert Raszuk<br>
<b>Cc:</b> Les Ginsberg (ginsberg); <a href=3D"mailto:lsr@ietf.org" target=
=3D"_blank">lsr@ietf.org</a>; Tony Przygienda<br>
<b>Subject:</b> Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed<=
u></u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><u></u>=C2=A0<u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11pt;font-family:Calibri,sans-serif">Hi Bruno,
<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11pt;font-family:Calibri,sans-serif"><u></u>=C2=A0<u></u><=
/span></p>
<div style=3D"border-right:none;border-bottom:none;border-left:none;border-=
top:1pt solid rgb(181,196,223);padding:3pt 0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:71.4pt"><b><span lang=3D"EN-US"=
 style=3D"color:black">From:
</span></b><span lang=3D"EN-US" style=3D"color:black">Lsr &lt;<a href=3D"ma=
ilto:lsr-bounces@ietf.org" target=3D"_blank">lsr-bounces@ietf.org</a>&gt; o=
n behalf of Bruno Decraene &lt;<a href=3D"mailto:bruno.decraene@orange.com"=
 target=3D"_blank">bruno.decraene@orange.com</a>&gt;<br>
<b>Date: </b>Monday, April 27, 2020 at 8:15 AM<br>
<b>To: </b>Robert Raszuk &lt;<a href=3D"mailto:robert@raszuk.net" target=3D=
"_blank">robert@raszuk.net</a>&gt;<br>
<b>Cc: </b>&quot;Les Ginsberg (ginsberg)&quot; &lt;ginsberg=3D<a href=3D"ma=
ilto:40cisco.com@dmarc.ietf.org" target=3D"_blank">40cisco.com@dmarc.ietf.o=
rg</a>&gt;, &quot;<a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@iet=
f.org</a>&quot; &lt;<a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@i=
etf.org</a>&gt;, Tony Przygienda &lt;<a href=3D"mailto:tonysietf@gmail.com"=
 target=3D"_blank">tonysietf@gmail.com</a>&gt;<br>
<b>Subject: </b>Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed<=
u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:71.4pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11pt"><u></u>=C2=A0<u></u></span></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:71.4pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">=
Robert,</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:71.4pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">=
=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt"><b><span lang=3D"EN-US=
" style=3D"font-size:10pt;font-family:Tahoma,sans-serif">From:</span></b><s=
pan lang=3D"EN-US" style=3D"font-size:10pt;font-family:Tahoma,sans-serif">
 Robert Raszuk [mailto:<a href=3D"mailto:robert@raszuk.net" target=3D"_blan=
k">robert@raszuk.net</a>] <br>
<b>Sent:</b> Monday, April 27, 2020 12:09 PM<br>
<b>To:</b> DECRAENE Bruno TGI/OLN<br>
<b>Cc:</b> Tony Przygienda; Les Ginsberg (ginsberg); <a href=3D"mailto:lsr@=
ietf.org" target=3D"_blank">lsr@ietf.org</a><br>
<b>Subject:</b> Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed<=
/span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt"><span lang=3D"EN-US">=
=C2=A0<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt"><span lang=3D"EN-US">=
=C2=A0<u></u><u></u></span></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt"><span lang=3D"EN-US">&=
gt; Slow flooding increase the likelihood of multiple IGP SPF computations=
=C2=A0=C2=A0<u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt"><span lang=3D"EN-US">=
=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt"><span lang=3D"EN-US">T=
rue.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt"><span lang=3D"EN-US">=
=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt"><span lang=3D"EN-US">B=
ut if you keep your IGP nicely organized in area and levels, get rid of flo=
oding anything incl. /32s domain wide to address bugs in MPLS architecture =
then your
 flooding radius is usually very small.=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:71.4pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">=
[Bruno] First of all, the use of areas/levels brings tradeoffs. Then, after=
 their initial design,
 networks grow and change.</span><span lang=3D"EN-US"><u></u><u></u></span>=
</p>
<p class=3D"MsoNormal" style=3D"margin-left:71.4pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">=
=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:71.4pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">=
Coming back to flooding, if you have a core router with 50 IGP neighbors, t=
he failure of this
 neighbor requires flooding 50 LSPs. At 33ms pacing between LSPs that=E2=80=
=99s a 1.6s delay/tax, before any computation &amp; FIB update. As you see,=
 it=E2=80=99s not related to the number of /32 nor the network diameter.</s=
pan><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:71.4pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">=
Some may be fine with this additional 1.6s. Some may not.</span><span lang=
=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif"><u></u><=
u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11pt;font-family:Calibri,sans-serif"><u></u>=C2=A0<u></u><=
/span></p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11pt;font-family:Calibri,sans-serif">I=E2=80=99m not nearl=
y as familiar with IS-IS deployments as OSPF. Are there any implementations=
 that don=E2=80=99t offer
 configuration to override the 33ms inter-LSP interval? <span style=3D"colo=
r:rgb(31,73,125)">
<u></u><u></u></span></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif;color:rgb(31,73,125)">[Bruno2] AFAIK, all implement=
ations allow the configuration of the inter-LSP interval.<u></u><u></u></sp=
an></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif;color:rgb(31,73,125)">The question is which value d=
o you set while not risking to overload your IS-IS
 neighbor. Which brings two issues:<u></u><u></u></span></p>
<p class=3D"gmail-m_6270245679185823838MsoListParagraph"><u></u><span lang=
=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb=
(31,73,125)"><span>-<span style=3D"font:7pt &quot;Times New Roman&quot;">=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span lang=3D"EN-US" style=3D"font-size:11pt;fo=
nt-family:Calibri,sans-serif;color:rgb(31,73,125)">This depends on the rece=
iver. E.g. High end router vs low end; PE with
 only 2 high adjacencies vs P with 50 adjacencies, router generation=E2=80=
=A6 While this is currently configured on the sender on a per receiver basi=
s<u></u><u></u></span></p>
<p class=3D"gmail-m_6270245679185823838MsoListParagraph"><u></u><span lang=
=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb=
(31,73,125)"><span>-<span style=3D"font:7pt &quot;Times New Roman&quot;">=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span lang=3D"EN-US" style=3D"font-size:11pt;fo=
nt-family:Calibri,sans-serif;color:rgb(31,73,125)">Even though the vendor k=
now the design and how it is implemented, some
 vendors may not commit on scaling values supported by a given receiver.<u>=
</u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif;color:rgb(31,73,125)">So there are two options:<u><=
/u><u></u></span></p>
<p class=3D"gmail-m_6270245679185823838MsoListParagraph"><u></u><span lang=
=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb=
(31,73,125)"><span>-<span style=3D"font:7pt &quot;Times New Roman&quot;">=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span lang=3D"EN-US" style=3D"font-size:11pt;fo=
nt-family:Calibri,sans-serif;color:rgb(31,73,125)">Have the receiver advert=
ise static values (default but according to its
 platform capability=3D<u></u><u></u></span></p>
<p class=3D"gmail-m_6270245679185823838MsoListParagraph"><u></u><span lang=
=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb=
(31,73,125)"><span>-<span style=3D"font:7pt &quot;Times New Roman&quot;">=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span lang=3D"EN-US" style=3D"font-size:11pt;fo=
nt-family:Calibri,sans-serif;color:rgb(31,73,125)">Use dynamic values. Flow=
 control is likely to also require some signaling
 from the receiver to the sender.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif;color:rgb(31,73,125)">In both cases, this call, IMO=
 a signaling capability from the receiver to the sender.
 The same signaling may then be used to advertise either static/default or =
dynamic values, depending on what the receiver prefer (some tend to prefer =
static values, some tend to prefer dynamic values)<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif;color:rgb(31,73,125)">Thanks,<u></u><u></u></span><=
/p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif;color:rgb(31,73,125)">BR<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif;color:rgb(31,73,125)">--Bruno<u></u><u></u></span><=
/p>
<p class=3D"MsoNormal" style=3D"margin-left:35.4pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11pt;font-family:Calibri,sans-serif">At
<span class=3D"gmail-m_6270245679185823838SpellE">Redback</span> (circa 200=
0), our OSPF implementation defaulted to fast flooding and for the MinLSInt=
erval and MinLSArrival OSPF values, you had to explicitly remove the fast f=
looding default if =C2=A0you wanted to follow RFC 2328. Thanks,<br>
Acee<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:71.4pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">=
=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:71.4pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">=
Best</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:71.4pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">=
--Bruno</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:71.4pt"><span lang=3D"EN-US" st=
yle=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">=
=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt"><span lang=3D"EN-US">=
=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt"><span lang=3D"EN-US">T=
hat in turn=C2=A0allows for both fast flooding and fast topology computatio=
n while only dealing with few external summaries. I am yet to see a practic=
al=C2=A0case where
 a well designed network with=C2=A0today&#39;s ISIS requires flooding speed=
up.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt"><span lang=3D"EN-US">=
=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt"><span lang=3D"EN-US">B=
est,<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt"><span lang=3D"EN-US">R=
.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt"><span lang=3D"EN-US">=
=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt"><span lang=3D"EN-US">=
=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt"><span lang=3D"EN-US">=
=C2=A0<u></u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt"><span lang=3D"EN-US">=
=C2=A0<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt"><span lang=3D"EN-US">O=
n Mon, Apr 27, 2020 at 10:34 AM &lt;<a href=3D"mailto:bruno.decraene@orange=
.com" target=3D"_blank">bruno.decraene@orange.com</a>&gt; wrote:<u></u><u><=
/u></span></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin:5pt 0c=
m 5pt 4.8pt">
<div>
<div>
<p class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598msolistpa=
ragraph" style=3D"margin-left:106.8pt">
<span lang=3D"EN-US" style=3D"font-family:Wingdings">=C3=98</span><span lan=
g=3D"EN-US" style=3D"font-size:7pt">=C2=A0
</span><span lang=3D"EN-US">ISIS flooding churn (and room for optimization)=
 becomes a problem when node boots up (IMHO this is not a problem) and when=
 node fails while having many neighbors attached. Yes maybe second case cou=
ld
 be improved but well designed and operated network should have pre-program=
med bypass paths against such cases so IMO stressing IGP to &quot;converge&=
quot; faster while great in principle may not be really needed in practice.=
=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598msolistpa=
ragraph" style=3D"margin-left:106.8pt">
<span lang=3D"EN-US">I don=E2=80=99t think that FRR is a replacement for =
=E2=80=9Cfast=E2=80=9D (I=E2=80=99d rather say adequate) IGP convergence &a=
mp; flooding.<u></u><u></u></span></p>
<p class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598msolistpa=
ragraph" style=3D"margin-left:106.8pt">
<span lang=3D"EN-US">For multiple reasons such as:<u></u><u></u></span></p>
<p class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598msolistpa=
ragraph" style=3D"margin-left:160.8pt">
<span lang=3D"EN-US">-</span><span lang=3D"EN-US" style=3D"font-size:7pt">=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span><span lang=3D"EN-US">Multiple =E2=80=98things=E2=80=99 depends on th=
e IGP, such as BGP best path selection, CSPF/TE/PCE computations, FRR compu=
tations<u></u><u></u></span></p>
<p class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598msolistpa=
ragraph" style=3D"margin-left:160.8pt">
<span lang=3D"EN-US">-</span><span lang=3D"EN-US" style=3D"font-size:7pt">=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span><span lang=3D"EN-US">Slow flooding increase the likelihood of multip=
le IGP SPF computations which is harmful for other computations which are t=
ypically heavier and manifolds (<span class=3D"gmail-m_6270245679185823838g=
mail-m-1289438270283603598spelle">cf</span>
 above)<u></u><u></u></span></p>
<p class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598msolistpa=
ragraph" style=3D"margin-left:160.8pt">
<span lang=3D"EN-US">-</span><span lang=3D"EN-US" style=3D"font-size:7pt">=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span><span lang=3D"EN-US">Multiple IGP SPF computations also create multi=
ple transient forwarding loops. There are some techniques to remove forward=
ing loops but this is still an advanced topic and some implementations do n=
ot
 handle consecutives IGP SPF (with =E2=80=98overlapping=E2=80=99 convergenc=
es and combined distributed forwarding loops)<u></u><u></u></span></p>
<p class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598msolistpa=
ragraph" style=3D"margin-left:160.8pt">
<span lang=3D"EN-US">-</span><span lang=3D"EN-US" style=3D"font-size:7pt">=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span><span lang=3D"EN-US">For FRR, you mostly need to pre-decide/configur=
e whether you want to protect link or node failures. Tradeoff are involved =
and given probability of events, link protection is usually enabled (hence =
not
 node protection)<u></u><u></u></span></p>
<p class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598msolistpa=
ragraph" style=3D"margin-left:160.8pt">
<span lang=3D"EN-US">-</span><span lang=3D"EN-US" style=3D"font-size:7pt">=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span><span lang=3D"EN-US">=E2=80=A6<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt;text-indent:18pt">
<span lang=3D"EN-US">Also, given the current =E2=80=9Cstate of the art=E2=
=80=9D, there is no stressing involved. Really. Using TCP, my 200=E2=82=AC =
mobile running on battery and over
<span class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598spelle=
">wifi+ADSL+Internet</span> can achieve better communication throughput tha=
n a n*100k=E2=82=AC high end IS-IS router.<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt;text-indent:18pt">
<span lang=3D"EN-US">I think many persons agree that IS-IS could do better =
in term of flooding. (possibly not as good as a brand new approach, but inc=
remental improvement also have some benefits). Eventually, we don=E2=80=99t=
 need everyone
 to agree on this.<u></u><u></u></span></p>
<p class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598msolistpa=
ragraph" style=3D"margin-left:106.8pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598msolistpa=
ragraph" style=3D"margin-left:106.8pt">
<span lang=3D"EN-US" style=3D"font-family:Wingdings">=C3=98</span><span lan=
g=3D"EN-US" style=3D"font-size:7pt">=C2=A0
</span><span lang=3D"EN-US">PS. Does anyone have a pointer to any real data=
 showing that performance of real life WAN ISIS deployments is bad ?=C2=A0<=
u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt">
<span lang=3D"EN-US">In some of our <span class=3D"gmail-m_6270245679185823=
838gmail-m-1289438270283603598spelle">
ASes</span>, we do monitor IS-IS by listening to and recording flooded LSPs=
. I can=E2=80=99t share any data.<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt">
<span lang=3D"EN-US">Next question could be what is =E2=80=9Cgood enough=E2=
=80=9D. I guess this may depend on the size of your network, its topology, =
and your requirements.<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt">
<span lang=3D"EN-US">We also ran tests in labs. I may share some results du=
ring my presentation. (no names, possibly no KPI, but some high level outco=
mes).<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt">
<span lang=3D"EN-US">Regards,<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt">
<span lang=3D"EN-US">Bruno<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></sp=
an></p>
<p class=3D"MsoNormal" style=3D"margin-left:106.8pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></sp=
an></p>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598spelle=
"><b><span lang=3D"EN-US" style=3D"font-size:10pt;font-family:Tahoma,sans-s=
erif">From</span></b></span><b><span lang=3D"EN-US" style=3D"font-size:10pt=
;font-family:Tahoma,sans-serif">:</span></b><span lang=3D"EN-US" style=3D"f=
ont-size:10pt;font-family:Tahoma,sans-serif">
 Robert Raszuk [mailto:<a href=3D"mailto:robert@raszuk.net" target=3D"_blan=
k">robert@raszuk.net</a>]
<br>
<b>Sent:</b> Friday, April 24, 2020 12:42 PM<br>
<b>To:</b> DECRAENE Bruno TGI/OLN<br>
<b>Cc:</b> Tony Przygienda; Les Ginsberg (ginsberg); <a href=3D"mailto:lsr@=
ietf.org" target=3D"_blank">
lsr@ietf.org</a><br>
<b>Subject:</b> Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed<=
/span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US">Hi Bruno=C2=A0 &amp; all,<u></u><u></u></span></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">[Bruno] On my side, I=E2=80=99ll try once and I thin=
k the LSR WG should also try to improve IS-IS performance. May be if we wan=
t to move, we should
 first release the brakes.</span><span lang=3D"EN-US">=C2=A0<u></u><u></u><=
/span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US">Well from my observations releasing the breaks means i=
ncreasing the risks.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US">Take BGP - breaks are off and see what happens :)=C2=
=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US">My personal observation is that ISIS implementations a=
cross vendors are just fine for vast majority of deployments today. That ac=
tually also includes vast majority of compute clusters as they consists=C2=
=A0of max
 10s of racks.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US">Of course there are larger clusters with 1000+ or 10K =
and above network elements itself and x 20 L3=C2=A0computes, but is there r=
eally a need to stretch protocol to accommodate=C2=A0those ? Those usually =
run BGP anyway.
 And also there is DV+LS hybrid too now.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US">ISIS flooding churn (and room for optimization) become=
s a problem when node boots up (IMHO this is not a problem) and when node f=
ails while having many neighbors attached. Yes maybe second case could be i=
mproved
 but well designed and operated network should have pre-programmed bypass p=
aths against such cases so IMO stressing IGP to &quot;converge&quot; faster=
 while great in principle may not be really needed in practice.=C2=A0<u></u=
><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US">Last I am worried that when IETF defines changes to co=
re protocol behaviour the quality of the implementations of those changes m=
ay really differ across vendors overall resulting in much worse performance=
=C2=A0and
 stability as compared to where we are today.=C2=A0<u></u><u></u></span></p=
>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US">I am just not sure if possible gains for few deploymen=
ts are greater then=C2=A0risk for 1000s of today&#39;s deployments. Maybe o=
ne size does not fit all and for massive scale ISIS we should define a noti=
on of &quot;ISIS-DC-PLUGIN&quot;
 which can be optionally in run time added when/if needed. If that requires=
 protocol changes to accommodate such dynamic plugins - that work should ta=
ke place.=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US">Many thx,<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US">R.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US">PS. Does anyone have a pointer to any real data showin=
g that performance of real life WAN ISIS deployments is bad ?=C2=A0<u></u><=
u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US">On Fri, Apr 24, 2020 at 11:26 AM &lt;<a href=3D"mailto=
:bruno.decraene@orange.com" target=3D"_blank">bruno.decraene@orange.com</a>=
&gt; wrote:<u></u><u></u></span></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin:5pt 0c=
m 5pt 4.8pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">Tony</span><span lang=3D"EN-US"><u></u><u></u></span=
></p>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></sp=
an></p>
<p class=3D"MsoNormal" style=3D"margin-left:177.6pt">
<b><span lang=3D"EN-US" style=3D"font-size:10pt;font-family:Tahoma,sans-ser=
if">From:</span></b><span lang=3D"EN-US" style=3D"font-size:10pt;font-famil=
y:Tahoma,sans-serif"> Tony Przygienda [mailto:<a href=3D"mailto:tonysietf@g=
mail.com" target=3D"_blank">tonysietf@gmail.com</a>]
<br>
<b>Sent:</b> Thursday, April 23, 2020 7:29 PM<br>
<b>To:</b> DECRAENE Bruno TGI/OLN<br>
<b>Cc:</b> <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</=
a>; Les Ginsberg (ginsberg)<br>
<b>Subject:</b> Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed<=
/span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:177.6pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:177.6pt">
<span lang=3D"EN-US">I was refering to RFC4960. Bruno, for all practical pu=
rposes I think that seems to go down the path of trying to reinvent RFC4960=
 (or ultimately use it).
<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">[Bruno] I don=E2=80=99t think that SCTP (RC4960) is =
a better fit than TCP. Many more features and options than TCP,
<span class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598gmail-=
m6484870522220906spelle">way</span> more than needed given existing IS-IS f=
looding mechanism. Much less implementations experience and improvement tha=
n TCP.</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:177.6pt">
<span lang=3D"EN-US">Or, changing the packet formats heavily to incorporate=
 all the control loop data you need to the point you have a different contr=
ol channel along those lines since you&#39;ll find most of the problems RFC=
4960 is
 describing (minus stuff like multiple paths).<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">[Bruno] Really, adding one sub-TLV in IS-IS is not =
=E2=80=9Cchanging the packet formats heavily=E2=80=9D.</span><span lang=3D"=
EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:177.6pt">
<span lang=3D"EN-US">Nothing wrong with that but it&#39;s ambitious on a 30=
 years old
<span class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598gmail-=
m6484870522220906spelle">anitque</span> artefact we&#39;re nursing forward =
here ;-)<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">[Bruno] I=E2=80=99m perfectly fine with revolution a=
pproaches. I think that we can also provide incremental improvement to IS-I=
S.</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:177.6pt">
<span lang=3D"EN-US">As entertaining footnote, I saw in last 20 years at le=
ast 3 attempts to allow multiple TCP sessions in BGP between peers to speed=
/prioritize things up. All
<span class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598gmail-=
m6484870522220906spelle">failed</span>,
<span class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598gmail-=
m6484870522220906spelle">after</span> the first one I helped to push I smar=
ted up ;-)
<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<b><i><span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans=
-serif;color:rgb(31,73,125)">=C2=A0</span></i></b><span lang=3D"EN-US" styl=
e=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">[B=
runo]
 On my side, I=E2=80=99ll try once and I think the LSR WG should also try t=
o improve IS-IS performance. May be if we want to move, we should first rel=
ease the brakes. I=E2=80=99m seen some progress, e.g., from =E2=80=9Cthere =
is no need to improve flooding=E2=80=9D to =E2=80=9Cwe all agree to improve
 flooding=E2=80=9D, or from =E2=80=9CNetwork operator just need to configur=
e existing CLI=E2=80=9D to =E2=80=9CWe agree that we need something more au=
tomated/dynamic=E2=80=9D. But this has been very slow progress over a year.=
</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></sp=
an></p>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">--Bruno</span><span lang=3D"EN-US"><u></u><u></u></s=
pan></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:177.6pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:177.6pt">
<span lang=3D"EN-US">As <span class=3D"gmail-m_6270245679185823838gmail-m-1=
289438270283603598gmail-m6484870522220906spelle">
another</span> <span class=3D"gmail-m_6270245679185823838gmail-m-1289438270=
283603598gmail-m6484870522220906spelle">
footnote</span>: I looked @ all the stuff in RIFT (tcp, quic, 4960, more ep=
hemeral stuff). I ended up adding to rift bunch very rudimentary things and=
 do roughly what Les/Peter/Acee started to write (modulo algorith I contrib=
uted and bunch things that would
 be helpful but we can&#39;t fit into existing packet format). This was as =
much decision as to &quot;what&#39;s available &amp; well debugged&quot; as=
 well as &quot;does it meet requirements&quot; as &quot;how complex is that=
 vs. rtx in flooding architecture=C2=A0 we have today + some feedback&quot;=
. Not
 on powerpoint, in real production code ;-) rift draft shows you the outcom=
e of that as IMO best trade-off to achieve high flooding speeds ;-)
<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:177.6pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:177.6pt">
<span lang=3D"EN-US">my 2c<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:177.6pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:177.6pt">
<span lang=3D"EN-US">-- tony <u></u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:177.6pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:177.6pt">
<span lang=3D"EN-US">On Thu, Apr 23, 2020 at 10:15 AM &lt;<a href=3D"mailto=
:bruno.decraene@orange.com" target=3D"_blank">bruno.decraene@orange.com</a>=
&gt; wrote:<u></u><u></u></span></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin:5pt 0c=
m 5pt 4.8pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:177.6pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">Tony,</span><span lang=3D"EN-US"><u></u><u></u></spa=
n></p>
<p class=3D"MsoNormal" style=3D"margin-left:213pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">Thanks for engaging.</span><span lang=3D"EN-US"><u><=
/u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:213pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">Please inline [Bruno2]</span><span lang=3D"EN-US"><u=
></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:177.6pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></sp=
an></p>
<p class=3D"MsoNormal" style=3D"margin-left:177.6pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></sp=
an></p>
<p class=3D"MsoNormal" style=3D"margin-left:177.6pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></sp=
an></p>
<p class=3D"MsoNormal" style=3D"margin-left:213pt">
<b><span lang=3D"EN-US" style=3D"font-size:10pt;font-family:Tahoma,sans-ser=
if">From:</span></b><span lang=3D"EN-US" style=3D"font-size:10pt;font-famil=
y:Tahoma,sans-serif"> Tony Przygienda [mailto:<a href=3D"mailto:tonysietf@g=
mail.com" target=3D"_blank">tonysietf@gmail.com</a>]
<br>
<b>Sent:</b> Wednesday, April 22, 2020 9:25 PM<br>
<b>To:</b> DECRAENE Bruno TGI/OLN<br>
<b>Cc:</b> <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</=
a>; Les Ginsberg (ginsberg)<br>
<b>Subject:</b> Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed<=
/span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:213pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:213pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:213pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:213pt">
<span lang=3D"EN-US">On Wed, Apr 22, 2020 at 11:03 AM &lt;<a href=3D"mailto=
:bruno.decraene@orange.com" target=3D"_blank">bruno.decraene@orange.com</a>=
&gt; wrote:<u></u><u></u></span></p>
</div>
<blockquote style=3D"border-left:1pt solid rgb(204,204,204);padding:0cm 0cm=
 0cm 6pt;margin:5pt 0cm 5pt 4.8pt;border-top:currentcolor;border-right:curr=
entcolor;border-bottom:currentcolor">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:213pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">Tony, all,</span><span lang=3D"EN-US"><u></u><u></u>=
</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:213pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></sp=
an></p>
<p class=3D"MsoNormal" style=3D"margin-left:213pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">Thanks Tony for the technical and constructive feedb=
ack.</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:213pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">Please inline [Bruno]</span><span lang=3D"EN-US"><u>=
</u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:213pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></sp=
an></p>
<p class=3D"MsoNormal" style=3D"margin-left:248.4pt">
<b><span lang=3D"EN-US" style=3D"font-size:10pt;font-family:Tahoma,sans-ser=
if">From:</span></b><span lang=3D"EN-US" style=3D"font-size:10pt;font-famil=
y:Tahoma,sans-serif"> Tony Przygienda [mailto:<a href=3D"mailto:tonysietf@g=
mail.com" target=3D"_blank">tonysietf@gmail.com</a>]
<br>
<b>Sent:</b> Wednesday, April 22, 2020 1:19 AM<br>
<b>To:</b> Les Ginsberg (ginsberg)<br>
<b>Cc:</b> DECRAENE Bruno TGI/OLN; <a href=3D"mailto:lsr@ietf.org" target=
=3D"_blank">
lsr@ietf.org</a><br>
<b>Subject:</b> Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed<=
/span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:248.4pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:248.4pt">
<span lang=3D"EN-US">neither am I aware of anything like this (i.e. per pla=
tform/product flooding rate constants) in any major vendor stack for whatev=
er that&#39;s worth. It&#39;s simply
<span class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598gmail-=
m6484870522220906gmail-m-1757288230754630308gmail-m2484166253138266685spell=
e">
unmaintanable</span>, point. All major vendors have extensive product lines=
 over so many changing hardware configuration/setups it is simply not viabl=
e to attempt precise measurements (and even then, user changing
<span class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598gmail-=
m6484870522220906gmail-m-1757288230754630308gmail-m2484166253138266685spell=
e">
config</span> can throw the stuff off in a millisecond). There may have bee=
n here and there per deployment scenario some &quot;recommended
<span class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598gmail-=
m6484870522220906gmail-m-1757288230754630308gmail-m2484166253138266685spell=
e">
config</span>&quot; (not something I immediately recall either) but that me=
ans very fixed configuration of things &amp; how they go into networks and =
even then I&#39;m not aware of anyone having had a &quot;precise model of t=
he chain in the box&quot;. yes, probes to measure lots
 and lots of stuff in the boxes exist but again, those are chip/<span class=
=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598gmail-m6484870522=
220906gmail-m-1757288230754630308gmail-m2484166253138266685spelle">linecard=
</span>/backplane/chassis/routing engine specific and mostly
 used in complex test/<span class=3D"gmail-m_6270245679185823838gmail-m-128=
9438270283603598gmail-m6484870522220906gmail-m-1757288230754630308gmail-m24=
84166253138266685spelle">peformance</span> scenarios and not to derive some=
 kind of equations that can predict anything much ...
<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:213pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">[Bruno] Good points.</span><span lang=3D"EN-US"><u><=
/u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:213pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">Yet, one of the information that we propose to adver=
tise by the LSP receiver to the LSP sender is the Receive Window.</span><sp=
an lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598gmail-m64=
84870522220906gmail-m-1757288230754630308gmail-m2484166253138266685msolistp=
aragraph" style=3D"margin-left:213pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">-</span><span lang=3D"EN-US" style=3D"font-size:7pt;=
color:rgb(31,73,125)">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0
</span><span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,san=
s-serif;color:rgb(31,73,125)">This is a very common parameter and algorithm=
. Nothing fancy nor reinvented. In particular it=E2=80=99s a parameter used=
 by TCP.</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598gmail-m64=
84870522220906gmail-m-1757288230754630308gmail-m2484166253138266685msolistp=
aragraph" style=3D"margin-left:213pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">-</span><span lang=3D"EN-US" style=3D"font-size:7pt;=
color:rgb(31,73,125)">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0
</span><span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,san=
s-serif;color:rgb(31,73,125)">I would argue that TCP implementations also r=
un on a variety of hardware and systems, must wider range than IS-IS platfo=
rm. And those
 TCP implementations on all those platform manage to advertise this paramet=
er (TCP window)</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598gmail-m64=
84870522220906gmail-m-1757288230754630308gmail-m2484166253138266685msolistp=
aragraph" style=3D"margin-left:213pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">-</span><span lang=3D"EN-US" style=3D"font-size:7pt;=
color:rgb(31,73,125)">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0
</span><span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,san=
s-serif;color:rgb(31,73,125)">I fail to understand that when some WG contri=
butors proposed the use of TCP, nobody said that determining and advertisin=
g a Receive Window
 would be an issue, difficult or even impossible. But when we propose to ad=
vertise a Receive Window in an IS-IS TLV, this becomes difficult or even im=
possible for some platforms. Can anyone help me understand the technical di=
fference?</span><span lang=3D"EN-US"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:248.4pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
</div>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:213pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:213pt">
<span lang=3D"EN-US">Bruno, I was waiting for that ;-)<u></u><u></u></span>=
</p>
<p class=3D"MsoNormal" style=3D"margin-left:177.6pt;text-indent:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">[Bruno2] Good ;-)</span><span lang=3D"EN-US"><u></u>=
<u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:177.6pt;text-indent:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></sp=
an></p>
<p class=3D"MsoNormal" style=3D"margin-left:213pt">
<span lang=3D"EN-US">Discounted for the fact that I&#39;m not a major TCP e=
xpert: TCP is a very different beast. it has a 100-200msec fast timer &amp;=
 500msec slow (which have to be quite accurate, it&#39;s really one timer f=
or all connections=C2=A0+
<span class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598gmail-=
m6484870522220906gmail-m-1757288230754630308spelle">
mbuf</span> and other magic) and it sends a _lot_ of packets back and forth=
 with window size indications so the negotiation can happen very quickly.=
=C2=A0
<span class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598gmail-=
m6484870522220906gmail-m-1757288230754630308spelle">
Also</span>, TCP <span class=3D"gmail-m_6270245679185823838gmail-m-12894382=
70283603598gmail-m6484870522220906gmail-m-1757288230754630308spelle">
can</span> <span class=3D"gmail-m_6270245679185823838gmail-m-12894382702836=
03598gmail-m6484870522220906gmail-m-1757288230754630308spelle">
detect</span> losses based on sequence number received contrary to routing =
protocols (that&#39;s one of the things we added in RIFT BTW) and it can re=
transmit quickly when it sees a &quot;hole&quot;. Contrary to that in ISIS =
ACKs may or may not come, they may be bundled,
 hellos may or may not come and we can&#39;t retransmit stuff on 100msec ti=
mers either. It&#39;s an utterly different transport channel.
<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:177.6pt;text-indent:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">[Bruno2] I would distinguish two things, which I thi=
nk we have done in
<a href=3D"https://tools.ietf.org/html/draft-decraene-lsr-isis-flooding-spe=
ed-03" target=3D"_blank">
https://tools.ietf.org/html/draft-decraene-lsr-isis-flooding-speed-03</a></=
span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598gmail-m64=
84870522220906gmail-m-1757288230754630308msolistparagraph" style=3D"margin-=
left:231pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">-</span><span lang=3D"EN-US" style=3D"font-size:7pt;=
color:rgb(31,73,125)">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0
</span><span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,san=
s-serif;color:rgb(31,73,125)">How fast you can adapt the sending rate. This=
 seems mostly dependent on the speed of the feedback loop, rather than the =
format of message.
 E.g. In IS-IS the receiver can give a feedback more or less quickly (e.g. =
depending on how fast/bundled it sends the PSNP). In theory, I don=E2=80=99=
t see a major different. From an in implementation standpoint, I=E2=80=99m =
guessing that the difference is probably bigger
 (e.g. TCP is probably lower level/closer to the system/hardware, than IS-I=
S which is more user space and possibly Platform Independent in some organi=
zations))</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598gmail-m64=
84870522220906gmail-m-1757288230754630308msolistparagraph" style=3D"margin-=
left:231pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">-</span><span lang=3D"EN-US" style=3D"font-size:7pt;=
color:rgb(31,73,125)">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0
</span><span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,san=
s-serif;color:rgb(31,73,125)">How fast you can detect packet loss. I agree =
that TCP &amp; IS-IS are very different on this. We have proposed to improv=
e this by allowing
 the receiver to advertise to the sender how fast it will <span class=3D"gm=
ail-m_6270245679185823838gmail-m-1289438270283603598gmail-m6484870522220906=
gmail-m-1757288230754630308spelle">
ack</span> the LSP. Currently the timer/behavior is known to receiver but n=
o to the sender. Hence the sender needs to assume the wort case (ISO defaul=
t).</span><span lang=3D"EN-US"><u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:213pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:213pt">
<span lang=3D"EN-US">In more abstract terms, TCP is a sliding N-window
<span class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598gmail-=
m6484870522220906gmail-m-1757288230754630308spelle">
protocol</span> (<span class=3D"gmail-m_6270245679185823838gmail-m-12894382=
70283603598gmail-m6484870522220906gmail-m-1757288230754630308spelle">where<=
/span> N
<span class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598gmail-=
m6484870522220906gmail-m-1757288230754630308spelle">
is</span> <span class=3D"gmail-m_6270245679185823838gmail-m-128943827028360=
3598gmail-m6484870522220906gmail-m-1757288230754630308spelle">
adjusted</span> all the time &amp; <span class=3D"gmail-m_62702456791858238=
38gmail-m-1289438270283603598gmail-m6484870522220906gmail-m-175728823075463=
0308spelle">
losses</span> <span class=3D"gmail-m_6270245679185823838gmail-m-12894382702=
83603598gmail-m6484870522220906gmail-m-1757288230754630308spelle">
can</span> <span class=3D"gmail-m_6270245679185823838gmail-m-12894382702836=
03598gmail-m6484870522220906gmail-m-1757288230754630308spelle">
be</span> <span class=3D"gmail-m_6270245679185823838gmail-m-128943827028360=
3598gmail-m6484870522220906gmail-m-1757288230754630308spelle">
efficiently</span> <span class=3D"gmail-m_6270245679185823838gmail-m-128943=
8270283603598gmail-m6484870522220906gmail-m-1757288230754630308spelle">
detected</span>) <span class=3D"gmail-m_6270245679185823838gmail-m-12894382=
70283603598gmail-m6484870522220906gmail-m-1757288230754630308spelle">
whereas</span> LSR <span class=3D"gmail-m_6270245679185823838gmail-m-128943=
8270283603598gmail-m6484870522220906gmail-m-1757288230754630308spelle">
flooding</span> <span class=3D"gmail-m_6270245679185823838gmail-m-128943827=
0283603598gmail-m6484870522220906gmail-m-1757288230754630308spelle">
is</span> not a <span class=3D"gmail-m_6270245679185823838gmail-m-128943827=
0283603598gmail-m6484870522220906gmail-m-1757288230754630308spelle">
windowing</span> <span class=3D"gmail-m_6270245679185823838gmail-m-12894382=
70283603598gmail-m6484870522220906gmail-m-1757288230754630308spelle">
protocol</span> (or <span class=3D"gmail-m_6270245679185823838gmail-m-12894=
38270283603598gmail-m6484870522220906gmail-m-1757288230754630308spelle">
rather</span> LSDB-size <span class=3D"gmail-m_6270245679185823838gmail-m-1=
289438270283603598gmail-m6484870522220906gmail-m-1757288230754630308spelle"=
>
window</span> <span class=3D"gmail-m_6270245679185823838gmail-m-12894382702=
83603598gmail-m6484870522220906gmail-m-1757288230754630308spelle">
protocol</span> <span class=3D"gmail-m_6270245679185823838gmail-m-128943827=
0283603598gmail-m6484870522220906gmail-m-1757288230754630308spelle">
with</span> <span class=3D"gmail-m_6270245679185823838gmail-m-1289438270283=
603598gmail-m6484870522220906gmail-m-1757288230754630308spelle">
selective</span> retransmission but no <span class=3D"gmail-m_6270245679185=
823838gmail-m-1289438270283603598gmail-m6484870522220906gmail-m-17572882307=
54630308spelle">
detection</span> of <span class=3D"gmail-m_6270245679185823838gmail-m-12894=
38270283603598gmail-m6484870522220906gmail-m-1757288230754630308spelle">
loss</span> [or <span class=3D"gmail-m_6270245679185823838gmail-m-128943827=
0283603598gmail-m6484870522220906gmail-m-1757288230754630308spelle">
only</span> <span class=3D"gmail-m_6270245679185823838gmail-m-1289438270283=
603598gmail-m6484870522220906gmail-m-1757288230754630308spelle">
very</span> slow <span class=3D"gmail-m_6270245679185823838gmail-m-12894382=
70283603598gmail-m6484870522220906gmail-m-1757288230754630308spelle">
based</span> on <span class=3D"gmail-m_6270245679185823838gmail-m-128943827=
0283603598gmail-m6484870522220906gmail-m-1757288230754630308spelle">
lack</span> of ACK &amp; <span class=3D"gmail-m_6270245679185823838gmail-m-=
1289438270283603598gmail-m6484870522220906gmail-m-1757288230754630308spelle=
">
CSNPs</span>]). Disadvantage of something like TCP (I think I sent out the =
RFC with UDP control protocol work to make it more TCP like)
<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:177.6pt;text-indent:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">[Bruno2] =C2=A0If you are referring to DCCP (Datagra=
m Congestion Control Protocol) (RFC 4340), yes you did and thank you for th=
is. Constructive feedback.</span><span lang=3D"EN-US"><u></u><u></u></span>=
</p>
<p class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598gmail-m64=
84870522220906gmail-m-1757288230754630308msolistparagraph" style=3D"margin-=
left:231pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">-</span><span lang=3D"EN-US" style=3D"font-size:7pt;=
color:rgb(31,73,125)">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0
</span><span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,san=
s-serif;color:rgb(31,73,125)">Regarding flow control, I=E2=80=99ve quickly =
looked at DCCP and it does not provides flow control.</span><span lang=3D"E=
N-US"><u></u><u></u></span></p>
<p class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598gmail-m64=
84870522220906gmail-m-1757288230754630308msolistparagraph" style=3D"margin-=
left:231pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">-</span><span lang=3D"EN-US" style=3D"font-size:7pt;=
color:rgb(31,73,125)">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0
</span><span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,san=
s-serif;color:rgb(31,73,125)">Regarding congestion control, possibly the al=
gorithm part may be reused. There are two
<span class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598gmail-=
m6484870522220906gmail-m-1757288230754630308spelle">
algo</span> and DCCP is open to others. May be one question is how much we =
want IS-IS to be fair to TCP (control plane TCP, not
<span class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598gmail-=
m6484870522220906gmail-m-1757288230754630308spelle">
dataplane</span>/user plane TCP). To me, IS-IS is more important than BGP t=
raffic, given their relative importance to the network, their delay require=
ments, their typical volume of traffic. But that is probably a =E2=80=9Cdet=
ail=E2=80=9D down the road. This is also depends
 on whether TCP &amp; IS-IS compete for the same resources (e.g. same queue=
) or not (ideally TCP and IS-IS have different queues).</span><span lang=3D=
"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:177.6pt;text-indent:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></sp=
an></p>
<p class=3D"MsoNormal" style=3D"margin-left:213pt">
<span lang=3D"EN-US">is that you are stuck when you put something into the =
pipe, no prioritization possible and if receiver is slow you may have multi=
ple obsolete copies in the pipe waiting &amp; lots retransmission BW when h=
oles are
 punched into the data through loss. And plain TCP=C2=A0 <span class=3D"gma=
il-m_6270245679185823838gmail-m-1289438270283603598gmail-m6484870522220906g=
mail-m-1757288230754630308spelle">
is</span> actually quite bad for control protocol traffic @ scale, almost a=
ll vendor run special version of it for BGP for that reason. Why that is is=
 out of scope of this list I think ... Flooding is really good to send lots=
 of data prioritized/in parallel
 but on <span class=3D"gmail-m_6270245679185823838gmail-m-12894382702836035=
98gmail-m6484870522220906gmail-m-1757288230754630308spelle">
losses</span> <span class=3D"gmail-m_6270245679185823838gmail-m-12894382702=
83603598gmail-m6484870522220906gmail-m-1757288230754630308spelle">
re</span>-TX <span class=3D"gmail-m_6270245679185823838gmail-m-128943827028=
3603598gmail-m6484870522220906gmail-m-1757288230754630308spelle">
is</span> slow.<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:177.6pt;text-indent:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">[Bruno2] Good that we seem to make the same distinct=
ion between the control loops for the sending rate vs the retransmission.</=
span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:177.6pt;text-indent:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">Regarding clarifying distinctions, draft may need to=
 better introduce the distinction between flow control and congestion contr=
ol, at least
 to structure the work and the discussion.</span><span lang=3D"EN-US"><u></=
u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:177.6pt;text-indent:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></sp=
an></p>
<p class=3D"MsoNormal" style=3D"margin-left:177.6pt;text-indent:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">Thanks</span><span lang=3D"EN-US"><u></u><u></u></sp=
an></p>
<p class=3D"MsoNormal" style=3D"margin-left:177.6pt;text-indent:35.4pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">--Bruno</span><span lang=3D"EN-US"><u></u><u></u></s=
pan></p>
</div>
<blockquote style=3D"border-left:1pt solid rgb(204,204,204);padding:0cm 0cm=
 0cm 6pt;margin:5pt 0cm 5pt 4.8pt;border-top:currentcolor;border-right:curr=
entcolor;border-bottom:currentcolor">
<div>
<div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:248.4pt">
<span lang=3D"EN-US">Bruno, if you&#39;re so deeply interested in that stuf=
f we can talk 1:1 off-line about implementation work on rift towards
<span class=3D"gmail-m_6270245679185823838gmail-m-1289438270283603598gmail-=
m6484870522220906gmail-m-1757288230754630308gmail-m2484166253138266685spell=
e">
adapatable</span> flooding rate<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:213pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">[Bruno] Sure. My pleasure. Please propose me some ti=
meslot offline. Please note that I=E2=80=99m based in Europe (CEST), so a p=
riori during your morning
 and my evening.</span><span lang=3D"EN-US"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:213pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">If you can also extend the offer to discuss the impl=
ementation work on the IS-IS implementation of your employer with regards t=
o adaptable flooding
 rate, and/or how network operator can configure the CLI parameters of the =
LSP senders so as to improve flooding rate without overloading the Juniper =
receiver (possibly depending on the capability of the receiver, its number =
of IS-IS neighbors=E2=80=A6 and/or whatever
 parameter that you feel are relevant) that would be most appreciated. And =
if you believe that the Juniper LSP receiver can handle any rate from any r=
easonable (e.g. 50) =C2=A0number of IGP neighbors, without (significantly) =
dropping the received LSPs, that would
 be even simpler, please advise.</span><span lang=3D"EN-US"><u></u><u></u><=
/span></p>
<p class=3D"MsoNormal" style=3D"margin-left:213pt">
<span lang=3D"EN-US" style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0</span><span lang=3D"EN-US"><u></u><u></u></sp=
an></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:248.4pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
</div>
</div>
</div>
</blockquote>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:213pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:213pt">
<span lang=3D"EN-US">ping me for that 1:1 on company email pls
<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:213pt">
<span lang=3D"EN-US">=C2=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:213pt">
<span lang=3D"EN-US">-- tony <u></u><u></u></span></p>
</div>
</div>
</div>
<pre style=3D"margin-left:177.6pt"><span lang=3D"EN-US">___________________=
___________________________________________________________________________=
___________________________<u></u><u></u></span></pre>
<pre style=3D"margin-left:177.6pt"><span lang=3D"EN-US">=C2=A0<u></u><u></u=
></span></pre>
<pre style=3D"margin-left:177.6pt"><span lang=3D"EN-US">Ce message et ses p=
ieces jointes peuvent contenir des informations confidentielles ou privileg=
iees et ne doivent donc<u></u><u></u></span></pre>
<pre style=3D"margin-left:177.6pt"><span lang=3D"EN-US">pas etre diffuses, =
exploites ou copies sans autorisation. Si vous avez recu ce message par err=
eur, veuillez le signaler<u></u><u></u></span></pre>
<pre style=3D"margin-left:177.6pt"><span lang=3D"EN-US">a l&#39;expediteur =
et le detruire ainsi que les pieces jointes. Les messages electroniques eta=
nt susceptibles d&#39;alteration,<u></u><u></u></span></pre>
<pre style=3D"margin-left:177.6pt"><span lang=3D"EN-US">Orange decline tout=
e responsabilite si ce message a ete altere, deforme ou falsifie. Merci.<u>=
</u><u></u></span></pre>
<pre style=3D"margin-left:177.6pt"><span lang=3D"EN-US">=C2=A0<u></u><u></u=
></span></pre>
<pre style=3D"margin-left:177.6pt"><span lang=3D"EN-US">This message and it=
s attachments may contain confidential or privileged information that may b=
e protected by law;<u></u><u></u></span></pre>
<pre style=3D"margin-left:177.6pt"><span lang=3D"EN-US">they should not be =
distributed, used or copied without authorisation.<u></u><u></u></span></pr=
e>
<pre style=3D"margin-left:177.6pt"><span lang=3D"EN-US">If you have receive=
d this email in error, please notify the sender and delete this message and=
 its attachments.<u></u><u></u></span></pre>
<pre style=3D"margin-left:177.6pt"><span lang=3D"EN-US">As emails may be al=
tered, Orange is not liable for messages that have been modified, changed o=
r falsified.<u></u><u></u></span></pre>
<pre style=3D"margin-left:177.6pt"><span lang=3D"EN-US">Thank you.<u></u><u=
></u></span></pre>
</div>
</blockquote>
</div>
</div>
<pre style=3D"margin-left:142.2pt"><span lang=3D"EN-US">___________________=
___________________________________________________________________________=
___________________________<u></u><u></u></span></pre>
<pre style=3D"margin-left:142.2pt"><span lang=3D"EN-US">=C2=A0<u></u><u></u=
></span></pre>
<pre style=3D"margin-left:142.2pt"><span lang=3D"EN-US">Ce message et ses p=
ieces jointes peuvent contenir des informations confidentielles ou privileg=
iees et ne doivent donc<u></u><u></u></span></pre>
<pre style=3D"margin-left:142.2pt"><span lang=3D"EN-US">pas etre diffuses, =
exploites ou copies sans autorisation. Si vous avez recu ce message par err=
eur, veuillez le signaler<u></u><u></u></span></pre>
<pre style=3D"margin-left:142.2pt"><span lang=3D"EN-US">a l&#39;expediteur =
et le detruire ainsi que les pieces jointes. Les messages electroniques eta=
nt susceptibles d&#39;alteration,<u></u><u></u></span></pre>
<pre style=3D"margin-left:142.2pt"><span lang=3D"EN-US">Orange decline tout=
e responsabilite si ce message a ete altere, deforme ou falsifie. Merci.<u>=
</u><u></u></span></pre>
<pre style=3D"margin-left:142.2pt"><span lang=3D"EN-US">=C2=A0<u></u><u></u=
></span></pre>
<pre style=3D"margin-left:142.2pt"><span lang=3D"EN-US">This message and it=
s attachments may contain confidential or privileged information that may b=
e protected by law;<u></u><u></u></span></pre>
<pre style=3D"margin-left:142.2pt"><span lang=3D"EN-US">they should not be =
distributed, used or copied without authorisation.<u></u><u></u></span></pr=
e>
<pre style=3D"margin-left:142.2pt"><span lang=3D"EN-US">If you have receive=
d this email in error, please notify the sender and delete this message and=
 its attachments.<u></u><u></u></span></pre>
<pre style=3D"margin-left:142.2pt"><span lang=3D"EN-US">As emails may be al=
tered, Orange is not liable for messages that have been modified, changed o=
r falsified.<u></u><u></u></span></pre>
<pre style=3D"margin-left:142.2pt"><span lang=3D"EN-US">Thank you.<u></u><u=
></u></span></pre>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:142.2pt">
<span lang=3D"EN-US">_______________________________________________<br>
Lsr mailing list<br>
<a href=3D"mailto:Lsr@ietf.org" target=3D"_blank">Lsr@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr" target=3D"_blank">htt=
ps://www.ietf.org/mailman/listinfo/lsr</a><u></u><u></u></span></p>
</blockquote>
</div>
</div>
<pre style=3D"margin-left:106.8pt"><span lang=3D"EN-US">___________________=
___________________________________________________________________________=
___________________________<u></u><u></u></span></pre>
<pre style=3D"margin-left:106.8pt"><span lang=3D"EN-US">=C2=A0<u></u><u></u=
></span></pre>
<pre style=3D"margin-left:106.8pt"><span lang=3D"EN-US">Ce message et ses p=
ieces jointes peuvent contenir des informations confidentielles ou privileg=
iees et ne doivent donc<u></u><u></u></span></pre>
<pre style=3D"margin-left:106.8pt"><span lang=3D"EN-US">pas etre diffuses, =
exploites ou copies sans autorisation. Si vous avez recu ce message par err=
eur, veuillez le signaler<u></u><u></u></span></pre>
<pre style=3D"margin-left:106.8pt"><span lang=3D"EN-US">a l&#39;expediteur =
et le detruire ainsi que les pieces jointes. Les messages electroniques eta=
nt susceptibles d&#39;alteration,<u></u><u></u></span></pre>
<pre style=3D"margin-left:106.8pt"><span lang=3D"EN-US">Orange decline tout=
e responsabilite si ce message a ete altere, deforme ou falsifie. Merci.<u>=
</u><u></u></span></pre>
<pre style=3D"margin-left:106.8pt"><span lang=3D"EN-US">=C2=A0<u></u><u></u=
></span></pre>
<pre style=3D"margin-left:106.8pt"><span lang=3D"EN-US">This message and it=
s attachments may contain confidential or privileged information that may b=
e protected by law;<u></u><u></u></span></pre>
<pre style=3D"margin-left:106.8pt"><span lang=3D"EN-US">they should not be =
distributed, used or copied without authorisation.<u></u><u></u></span></pr=
e>
<pre style=3D"margin-left:106.8pt"><span lang=3D"EN-US">If you have receive=
d this email in error, please notify the sender and delete this message and=
 its attachments.<u></u><u></u></span></pre>
<pre style=3D"margin-left:106.8pt"><span lang=3D"EN-US">As emails may be al=
tered, Orange is not liable for messages that have been modified, changed o=
r falsified.<u></u><u></u></span></pre>
<pre style=3D"margin-left:106.8pt"><span lang=3D"EN-US">Thank you.<u></u><u=
></u></span></pre>
</div>
</blockquote>
</div>
<pre style=3D"margin-left:71.4pt"><span lang=3D"EN-US">____________________=
___________________________________________________________________________=
__________________________<u></u><u></u></span></pre>
<pre style=3D"margin-left:71.4pt"><span lang=3D"EN-US"><u></u>=C2=A0<u></u>=
</span></pre>
<pre style=3D"margin-left:71.4pt"><span lang=3D"EN-US">Ce message et ses pi=
eces jointes peuvent contenir des informations confidentielles ou privilegi=
ees et ne doivent donc<u></u><u></u></span></pre>
<pre style=3D"margin-left:71.4pt"><span lang=3D"EN-US">pas etre diffuses, e=
xploites ou copies sans autorisation. Si vous avez recu ce message par erre=
ur, veuillez le signaler<u></u><u></u></span></pre>
<pre style=3D"margin-left:71.4pt"><span lang=3D"EN-US">a l&#39;expediteur e=
t le detruire ainsi que les pieces jointes. Les messages electroniques etan=
t susceptibles d&#39;alteration,<u></u><u></u></span></pre>
<pre style=3D"margin-left:71.4pt"><span lang=3D"EN-US">Orange decline toute=
 responsabilite si ce message a ete altere, deforme ou falsifie. Merci.<u><=
/u><u></u></span></pre>
<pre style=3D"margin-left:71.4pt"><span lang=3D"EN-US"><u></u>=C2=A0<u></u>=
</span></pre>
<pre style=3D"margin-left:71.4pt"><span lang=3D"EN-US">This message and its=
 attachments may contain confidential or privileged information that may be=
 protected by law;<u></u><u></u></span></pre>
<pre style=3D"margin-left:71.4pt"><span lang=3D"EN-US">they should not be d=
istributed, used or copied without authorisation.<u></u><u></u></span></pre=
>
<pre style=3D"margin-left:71.4pt"><span lang=3D"EN-US">If you have received=
 this email in error, please notify the sender and delete this message and =
its attachments.<u></u><u></u></span></pre>
<pre style=3D"margin-left:71.4pt"><span lang=3D"EN-US">As emails may be alt=
ered, Orange is not liable for messages that have been modified, changed or=
 falsified.<u></u><u></u></span></pre>
<pre style=3D"margin-left:71.4pt"><span lang=3D"EN-US">Thank you.<u></u><u>=
</u></span></pre>
</div>
<pre>______________________________________________________________________=
___________________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l&#39;expediteur et le detruire ainsi que les pieces jointes. Les message=
s electroniques etant susceptibles d&#39;alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.
Thank you.
</pre></div>

</blockquote></div>

--00000000000068386c05a446ad6a--


From nobody Mon Apr 27 08:25:49 2020
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From: <bruno.decraene@orange.com>
To: Robert Raszuk <robert@raszuk.net>
CC: "Acee Lindem (acee)" <acee@cisco.com>, "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, "Tony Przygienda" <tonysietf@gmail.com>
Thread-Topic: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
Thread-Index: AQHWHKGTbkJZPBB7TgK3RmmTteJ+KqiNFPVg
Date: Mon, 27 Apr 2020 15:25:23 +0000
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Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/iZh4kba5oQ5PW9aMLR1JRitNVx4>
Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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Robert,

> > In both cases, this call, IMO a signaling capability from the =
receiver to the sender. =20
>=20
> So essentially you are asking for per peer flooding queue.=20


You already have a per-interface flooding =E2=80=98queue' through the =
implementation of the SRM bit in the LSDB, which must be managed on a =
per-interface basis.


> Now this get's a little bit of tricky (especially if you are dealing =
with relatively small timers) if one peer sends you 1 ms, second 50 ms =
and 10th  250 ms.=20


If the peers are on the same interface, then you clearly have to not =
overrun the slower peer.  Note that both are slower than the currently =
mandated 33ms.

If the peers are on different interfaces, then this tells you how to =
configure the per-interface timers.


> Imagine that the LSP to be flooded to the 10th peer is already =
overwritten due to new LSP but still sitting in the out queue ... do you =
drain that queue and start over with new LSP or you in place replace the =
old one keeping the running timer ?=20
>=20
> I am just curious what will happen under the hood :)=20


You=E2=80=99re assuming a strict queue, when in fact, what happens under =
the hood is simpler: each LSP has a per-interface bit saying that it =
must be sent on that interface. When it=E2=80=99s time to transmit you =
walk the LSDB looking for an LSP with the bit set, and then transmit it. =
If an LSP is overwritten, that=E2=80=99s fine, the bit is still set and =
you would send the newer version.

Walking the LSDB every time is obviously inefficient, so an =
implementation is free to maintain other data structures to optimize =
this if it chooses, but the semantics are quite clear: send LSPs that =
haven=E2=80=99t been sent yet.

Regards,
Tony


--Apple-Mail=_2A7BE4C2-CE87-48A6-B394-0A95FC2BF14A
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D""><div =
class=3D""><br class=3D""></div>Robert,<div class=3D""><br =
class=3D""></div><div class=3D""><div><blockquote type=3D"cite" =
class=3D""><div class=3D""><div dir=3D"ltr" class=3D""><span =
style=3D"color:rgb(31,73,125);font-family:Calibri,sans-serif;font-size:14.=
6667px" class=3D"">&gt; In both cases, this call, IMO a signaling =
capability from the receiver to the sender.</span>&nbsp;&nbsp;<br =
class=3D""><div class=3D""><br class=3D""></div><div class=3D"">So =
essentially you are asking for per peer flooding =
queue.&nbsp;</div></div></div></blockquote><div><br =
class=3D""></div><div><br class=3D""></div><div>You already have a =
per-interface flooding =E2=80=98queue' through the implementation of the =
SRM bit in the LSDB, which must be managed on a per-interface =
basis.</div><div><br class=3D""></div><div><br =
class=3D""></div><blockquote type=3D"cite" class=3D""><div class=3D""><div=
 dir=3D"ltr" class=3D""><div class=3D"">Now this get's a little bit of =
tricky (especially if you are dealing with&nbsp;relatively small timers) =
if one peer sends you 1 ms, second 50 ms and 10th&nbsp; 250 =
ms.&nbsp;</div></div></div></blockquote><div><br class=3D""></div><div><br=
 class=3D""></div><div>If the peers are on the same interface, then you =
clearly have to not overrun the slower peer. &nbsp;Note that both are =
slower than the currently mandated 33ms.</div><div><br =
class=3D""></div><div>If the peers are on different interfaces, then =
this tells you how to configure the per-interface timers.</div><div><br =
class=3D""></div><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D""><div dir=3D"ltr" class=3D""><div class=3D"">Imagine that the =
LSP to be flooded to the 10th peer is already overwritten due to new LSP =
but still sitting in the&nbsp;out queue ... do you drain that queue and =
start over with new LSP or you in place replace the old one keeping the =
running timer ?&nbsp;</div><div class=3D""><br class=3D""></div><div =
class=3D"">I am just curious what will happen under the hood =
:)&nbsp;</div></div></div></blockquote></div><br class=3D""></div><div =
class=3D""><br class=3D""></div><div class=3D"">You=E2=80=99re assuming =
a strict queue, when in fact, what happens under the hood is simpler: =
each LSP has a per-interface bit saying that it must be sent on that =
interface. When it=E2=80=99s time to transmit you walk the LSDB looking =
for an LSP with the bit set, and then transmit it. If an LSP is =
overwritten, that=E2=80=99s fine, the bit is still set and you would =
send the newer version.</div><div class=3D""><br class=3D""></div><div =
class=3D"">Walking the LSDB every time is obviously inefficient, so an =
implementation is free to maintain other data structures to optimize =
this if it chooses, but the semantics are quite clear: send LSPs that =
haven=E2=80=99t been sent yet.</div><div class=3D""><br =
class=3D""></div><div class=3D"">Regards,</div><div =
class=3D"">Tony</div><div class=3D""><br class=3D""></div></body></html>=

--Apple-Mail=_2A7BE4C2-CE87-48A6-B394-0A95FC2BF14A--


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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "bruno.decraene@orange.com" <bruno.decraene@orange.com>, Robert Raszuk <robert@raszuk.net>
CC: "Acee Lindem (acee)" <acee@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>, Tony Przygienda <tonysietf@gmail.com>
Thread-Topic: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>, Robert Raszuk <robert@raszuk.net>
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Thread-Topic: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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Date: Mon, 27 Apr 2020 17:48:03 +0000
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From: Robert Raszuk <robert@raszuk.net>
Date: Mon, 27 Apr 2020 19:55:19 +0200
Message-ID: <CAOj+MMF+jpfz0vsXum7eH=VTVzGA0dkbyXeQqnNwZ2uoibZ1hQ@mail.gmail.com>
To: Tony Li <tony.li@tony.li>
Cc: Bruno Decraene <bruno.decraene@orange.com>,  "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>, "lsr@ietf.org" <lsr@ietf.org>,  "Acee Lindem (acee)" <acee@cisco.com>, Tony Przygienda <tonysietf@gmail.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/_5VmOegGsNPucvFzJ4jwf66o8FM>
Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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Hi Tony,


> You already have a per-interface flooding =E2=80=98queue' through the
> implementation of the SRM bit in the LSDB, which must be managed on a
> per-interface basis.
>

Today from what I see operators (if they even change the default) normally
apply same timer value on all interfaces. If the timer is static what would
be the incentive for any implementation not to group interfaces with
identical transmit delay ?

- - -

While this thread is very interesting I must observe that from my
experience the issue is usually on the receiver. If LSR would publish a one
page draft/rfc mandating that links state packets MUST or SHOULD be
recognized and separated from any other control plane traffic at the
ingress interface level (on their way to local RE/RP) we likely wouldn't be
having such debate.

Slowing senders just due to bad implementation of the receiving router is
IMHO a little suboptimal (not to say wrong) thing to do.

Kind regards,
R.

--000000000000b19cf005a4496b7e
Content-Type: text/html; charset="UTF-8"
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<div dir=3D"ltr"><div class=3D"gmail_quote"><div>Hi=C2=A0Tony,</div><div>=
=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0=
.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style=3D=
"overflow-wrap: break-word;"><div><div><div>You already have a per-interfac=
e flooding =E2=80=98queue&#39; through the implementation of the SRM bit in=
 the LSDB, which must be managed on a per-interface basis.</div></div></div=
></div></blockquote><div><br></div><div>Today from what I see operators (if=
 they even change the default) normally apply same timer value on all inter=
faces. If the timer is static what would be the incentive for any implement=
ation not to group interfaces with identical transmit delay ?=C2=A0</div><d=
iv><br></div><div>- - -=C2=A0</div><div><br></div><div>While this thread is=
 very interesting I must observe that from my experience the issue is usual=
ly on the receiver. If LSR would publish a one page draft/rfc=C2=A0mandatin=
g=C2=A0that links state packets MUST or SHOULD be recognized and separated =
from any other control plane traffic at the ingress interface level (on the=
ir way to local RE/RP) we likely wouldn&#39;t be having such debate.=C2=A0<=
/div><div><br></div><div>Slowing senders just due to bad implementation of =
the receiving router is IMHO a little suboptimal (not to say wrong) thing t=
o do.=C2=A0</div><div><br></div><div>Kind regards,</div><div>R.</div></div>=
</div>

--000000000000b19cf005a4496b7e--


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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "bruno.decraene@orange.com" <bruno.decraene@orange.com>, Robert Raszuk <robert@raszuk.net>
CC: "Acee Lindem (acee)" <acee@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>, Tony Przygienda <tonysietf@gmail.com>
Thread-Topic: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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Date: Mon, 27 Apr 2020 18:09:35 +0000
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Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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To: Robert Raszuk <robert@raszuk.net>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/I-o4KG7XJaHN_nHn84awYW4nERc>
Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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Hi Robert,

> Today from what I see operators (if they even change the default) =
normally apply same timer value on all interfaces. If the timer is =
static what would be the incentive for any implementation not to group =
interfaces with identical transmit delay ?=20


Why should the timer be static in an optimal system?  We want to avoid =
the need for the timer and have systems be adaptive.


> While this thread is very interesting I must observe that from my =
experience the issue is usually on the receiver. If LSR would publish a =
one page draft/rfc mandating that links state packets MUST or SHOULD be =
recognized and separated from any other control plane traffic at the =
ingress interface level (on their way to local RE/RP) we likely wouldn't =
be having such debate.=20
>=20
> Slowing senders just due to bad implementation of the receiving router =
is IMHO a little suboptimal (not to say wrong) thing to do.=20


Heck, we can do better than that: we can outlaw bad implementations of =
anything.  Do you think that will help?=20

The fact of the matter is that even good implementations can congest.  =
As silicon continues to scale, the ratio of interface bandwidth to =
control plane processing power continues to shift. Silicon has =
completely taken over our forwarding planes and scales upwards, where a =
single chip is now forwardinging for hundreds of interfaces. Meanwhile, =
buffering is finite and control planes really can=E2=80=99t keep up. =
Forwarding is a parallel activity. The control plane is not.  This =
presents us with a situation where congestion is pretty much inevitable. =
We need to deal with it.

Tony


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In-Reply-To: <59B46050-6F6B-4A9B-99CD-4E0C76FA17F2@tony.li>
From: Robert Raszuk <robert@raszuk.net>
Date: Mon, 27 Apr 2020 20:38:45 +0200
Message-ID: <CAOj+MMEWGiwyG6oRdoE5HQdfzNkLK-E3dhBE_FvV=ysqod4Ftw@mail.gmail.com>
To: Tony Li <tony.li@tony.li>
Cc: Bruno Decraene <bruno.decraene@orange.com>,  "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>, "lsr@ietf.org" <lsr@ietf.org>,  "Acee Lindem (acee)" <acee@cisco.com>, Tony Przygienda <tonysietf@gmail.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/DopjD0AmxNup11Gq0sV4NSSSogE>
Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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> Meanwhile, buffering is finite and control planes really can=E2=80=99t ke=
ep up.
> Forwarding is a parallel activity. The control plane is not.  This presen=
ts
> us with a situation where congestion is pretty much inevitable. We need t=
o
> deal with it.


At least we are lucky that ISIS LSPs are produced by some other control
plane not by a silicon chip :)

If we have 1000 of interfaces and all peers *all in the same time* will
send us an LSP of max size of 1492 octets that our control plane buffer RAM
size required to store them would be as huge as 1.5 MB. And that assumes we
did not process any from arrival of the first to the arrival of the last
one.

Thx,
R.

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<div dir=3D"ltr"><div dir=3D"ltr"><br></div><div class=3D"gmail_quote"><blo=
ckquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left=
:1px solid rgb(204,204,204);padding-left:1ex">Meanwhile, buffering is finit=
e and control planes really can=E2=80=99t keep up. Forwarding is a parallel=
 activity. The control plane is not.=C2=A0 This presents us with a situatio=
n where congestion is pretty much inevitable. We need to deal with it.</blo=
ckquote><div><br></div><div>At least we are lucky that ISIS LSPs are produc=
ed by some other control plane not by a silicon chip :)=C2=A0</div><div><br=
></div><div>If we have 1000 of interfaces and all peers *all in the same ti=
me* will send us an LSP of max size of 1492 octets that our control plane b=
uffer RAM size required to store them would be as huge as 1.5 MB. And that =
assumes we did not process any from arrival of the first to the arrival=C2=
=A0of the last one.=C2=A0</div><div><br></div><div>Thx,</div><div>R.</div><=
div><br></div></div></div>

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To: Robert Raszuk <robert@raszuk.net>
References: <MW3PR11MB46191E81D5B22B454D8184A4C1100@MW3PR11MB4619.namprd11.prod.outlook.com> <MW3PR11MB461942C752F9CCB0A6E6C1BFC1100@MW3PR11MB4619.namprd11.prod.outlook.com> <13222_1587383221_5E9D8BB5_13222_339_1_53C29892C857584299CBF5D05346208A48E22AF0@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <MW3PR11MB46191D244D51A05F9AA4631DC1D50@MW3PR11MB4619.namprd11.prod.outlook.com> <CA+wi2hN2A3oZcZWngNjBnZ214jiGNfqyTZpytpK0jrxH68SnqQ@mail.gmail.com> <6448_1587578604_5EA086EC_6448_75_1_53C29892C857584299CBF5D05346208A48E26E6F@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <CA+wi2hPd0Ccn_RiSf=EMa6BfPVhN5FnnOR2hz1PeWpMNNub-BA@mail.gmail.com> <19631_1587662111_5EA1CD1F_19631_99_1_53C29892C857584299CBF5D05346208A48E28EDE@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <CA+wi2hMm=0C9LVy8po2eoYnrTRC6AKawoMJoDoEm5xtbFEvfhw@mail.gmail.com> <4008_1587720323_5EA2B083_4008_332_1_53C29892C857584299CBF5D05346208A48E29FE5@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <CAOj+MMHJfkP5J_Jk+qpLi-VPwca-qwmezynKkKifqcyOxoZAsA@mail.gmail.com> <12067_1587976445_5EA698FD_12067_293_6_53C29892C857584299CBF5D05346208A48E2E14C@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <CAOj+MMH6OZihneJjtH_PfXKfOh1ydTD4hQK3FfDJxjtRowMrRw@mail.gmail.com> <24062_1587989690_5EA6CCBA_24062_69_1_53C29892C857584299CBF5D05346208A48E2E517@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <4DE67B7F-A8E7-4595-8EB6-BED074C38B2F@cisco.com> <27097_1587992566_5EA6D7F6_27097_166_1_53C29892C857584299CBF5D05346208A48E2E687@OPEXCAUBM43.corporate.adroot.infra.ftgroup> <CAOj+MMGENdGn-FB5GwkhsMZsTm_gQSYYmaGCyLy=5nAnCtvSRA@mail.gmail.com> <242BC3A4-0BD5-4F60-9B2F-3C9D1E7106E2@tony.li> <CAOj+MMF+jpfz0vsXum7eH=VTVzGA0dkbyXeQqnNwZ2uoibZ1hQ@mail.gmail.com> <59B46050-6F6B-4A9B-99CD-4E0C76FA17F2@tony.li> <CAOj+MMEWGiwyG6oRdoE5HQdfzNkLK-E3dhBE_FvV=ysqod4Ftw@mail.gmail.com>
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Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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> If we have 1000 of interfaces and all peers *all in the same time* =
will send us an LSP of max size of 1492 octets that our control plane =
buffer RAM size required to store them would be as huge as 1.5 MB. And =
that assumes we did not process any from arrival of the first to the =
arrival of the last one.=20


And that=E2=80=99s only one LSP.  If they don=E2=80=99t stop there and =
each sends 1000 LSPs, then you can have 10^6 incoming packets, requiring =
1.6GB.

Further, since the bottleneck is likely the queue of packet on the =
forwarding chip(s) to the CPU, this 1.6GB needs to exist on the =
forwarding silicon.  Needless to say, it doesn=E2=80=99t.

Yes, the CPU can probably keep up with one of the peers. This implies =
that the forwarding plane queue grows at the rate that 999 peers are =
sending at. Thus, congestion.

Tony


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normal; letter-spacing: normal; text-align: start; text-indent: 0px; =
text-transform: none; white-space: normal; word-spacing: 0px; =
-webkit-text-stroke-width: 0px; text-decoration: none; float: none; =
display: inline !important;" class=3D"">If we have 1000 of interfaces =
and all peers *all in the same time* will send us an LSP of max size of =
1492 octets that our control plane buffer RAM size required to store =
them would be as huge as 1.5 MB. And that assumes we did not process any =
from arrival of the first to the arrival&nbsp;of the last =
one.&nbsp;</span></div></blockquote></div><br class=3D""><div =
class=3D""><br class=3D""></div><div class=3D"">And that=E2=80=99s only =
one LSP. &nbsp;If they don=E2=80=99t stop there and each sends 1000 =
LSPs, then you can have 10^6 incoming packets, requiring =
1.6GB.</div><div class=3D""><br class=3D""></div><div class=3D"">Further, =
since the bottleneck is likely the queue of packet on the forwarding =
chip(s) to the CPU, this 1.6GB needs to exist on the forwarding silicon. =
&nbsp;Needless to say, it doesn=E2=80=99t.</div><div class=3D""><br =
class=3D""></div><div class=3D"">Yes, the CPU can probably keep up with =
one of the peers. This implies that the forwarding plane queue grows at =
the rate that 999 peers are sending at. Thus, congestion.</div><div =
class=3D""><br class=3D""></div><div class=3D"">Tony</div><div =
class=3D""><br class=3D""></div></body></html>=

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From: Robert Raszuk <robert@raszuk.net>
Date: Mon, 27 Apr 2020 21:11:32 +0200
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To: Tony Li <tony.li@tony.li>
Cc: Bruno Decraene <bruno.decraene@orange.com>,  "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>, "lsr@ietf.org" <lsr@ietf.org>,  "Acee Lindem (acee)" <acee@cisco.com>, Tony Przygienda <tonysietf@gmail.com>
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Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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Ahh ok.

I was under the assumption that flooding reduction is something we will
have sooner then LSP flow control. But maybe this was too optimistic.

- - -

For per peer flow control I do not get how receiver's ISIS process is to
come up with per peer timer if it may never see under congestion given
peer's LSPs (being dropped on the single RE cp queue or at the interface).

Perhaps such flag to "slow down guys" could be send by receiver uniformly
to all peers when under LSP flooding congestion ? And instead of
specifying an absolute number just mean: slow N times (ex: slow 2 times or
slow 4 times). Such timer could be either temporary with fixed duration or
in effect until relaxed explicitly.

LSP senders would still require to handle it on a per peer basis but as
indicated this is not an issue.

Thx.
R.

On Mon, Apr 27, 2020 at 8:57 PM <tony.li@tony.li> wrote:

>
> If we have 1000 of interfaces and all peers *all in the same time* will
> send us an LSP of max size of 1492 octets that our control plane buffer R=
AM
> size required to store them would be as huge as 1.5 MB. And that assumes =
we
> did not process any from arrival of the first to the arrival of the last
> one.
>
>
>
> And that=E2=80=99s only one LSP.  If they don=E2=80=99t stop there and ea=
ch sends 1000
> LSPs, then you can have 10^6 incoming packets, requiring 1.6GB.
>
> Further, since the bottleneck is likely the queue of packet on the
> forwarding chip(s) to the CPU, this 1.6GB needs to exist on the forwardin=
g
> silicon.  Needless to say, it doesn=E2=80=99t.
>
> Yes, the CPU can probably keep up with one of the peers. This implies tha=
t
> the forwarding plane queue grows at the rate that 999 peers are sending a=
t.
> Thus, congestion.
>
> Tony
>
>

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<div dir=3D"ltr">Ahh ok.=C2=A0<div><br></div><div>I was under the assumptio=
n that flooding reduction is something we will have sooner then LSP flow co=
ntrol. But maybe this was too optimistic.=C2=A0</div><div><br></div><div>- =
- -=C2=A0</div><div><br></div><div>For per peer flow control I do not get h=
ow receiver&#39;s=C2=A0ISIS process is to come up with per peer timer if it=
 may never see under congestion given peer&#39;s LSPs (being dropped on the=
 single RE cp queue or at the interface).=C2=A0</div><div><br></div><div>Pe=
rhaps such flag to &quot;slow down guys&quot; could be send=C2=A0by=C2=A0re=
ceiver uniformly to all peers when under LSP flooding congestion=C2=A0? And=
 instead of specifying=C2=A0an absolute number just mean: slow N times (ex:=
 slow 2 times or slow 4 times). Such timer could be either temporary with f=
ixed duration or in effect until=C2=A0relaxed explicitly.=C2=A0</div><div><=
br></div><div>LSP senders would still require to handle it on a per peer ba=
sis but as indicated this is not an issue.=C2=A0</div><div><br></div><div>T=
hx.<br>R.</div></div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=
=3D"gmail_attr">On Mon, Apr 27, 2020 at 8:57 PM &lt;<a href=3D"mailto:tony.=
li@tony.li">tony.li@tony.li</a>&gt; wrote:<br></div><blockquote class=3D"gm=
ail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,=
204,204);padding-left:1ex"><div style=3D"overflow-wrap: break-word;"><br><d=
iv><blockquote type=3D"cite"><div><span style=3D"font-family:Helvetica;font=
-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;le=
tter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;wh=
ite-space:normal;word-spacing:0px;text-decoration:none;float:none;display:i=
nline">If we have 1000 of interfaces and all peers *all in the same time* w=
ill send us an LSP of max size of 1492 octets that our control plane buffer=
 RAM size required to store them would be as huge as 1.5 MB. And that assum=
es we did not process any from arrival of the first to the arrival=C2=A0of =
the last one.=C2=A0</span></div></blockquote></div><br><div><br></div><div>=
And that=E2=80=99s only one LSP.=C2=A0 If they don=E2=80=99t stop there and=
 each sends 1000 LSPs, then you can have 10^6 incoming packets, requiring 1=
.6GB.</div><div><br></div><div>Further, since the bottleneck is likely the =
queue of packet on the forwarding chip(s) to the CPU, this 1.6GB needs to e=
xist on the forwarding silicon.=C2=A0 Needless to say, it doesn=E2=80=99t.<=
/div><div><br></div><div>Yes, the CPU can probably keep up with one of the =
peers. This implies that the forwarding plane queue grows at the rate that =
999 peers are sending at. Thus, congestion.</div><div><br></div><div>Tony</=
div><div><br></div></div></blockquote></div>

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To: Robert Raszuk <robert@raszuk.net>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/9GkZdXmDrdMSjCB2UCmzqTg_DeU>
Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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Robert,

> For per peer flow control I do not get how receiver's ISIS process is =
to come up with per peer timer if it may never see under congestion =
given peer's LSPs (being dropped on the single RE cp queue or at the =
interface).=20


I=E2=80=99m sorry, but I can=E2=80=99t parse this comment.  The intent =
is not for the receiver to specify a timer value.  The point is for the =
receiver to provider the LSP sender with feedback about available =
resources on the receiver. This can inform the sender=E2=80=99s =
computation of a reasonable transmit bandwidth.


> Perhaps such flag to "slow down guys" could be send by receiver =
uniformly to all peers when under LSP flooding congestion ?


That=E2=80=99s effectively what we=E2=80=99re proposing, tho it need not =
be a binary flag.  It allows us to do simpler things saying =E2=80=9Cwe=E2=
=80=99re running out of buffer space, please slow down a bit=E2=80=9D. =
Again the goal is to find the optimal goodput.  Granularity in the =
feedback will be helpful.

Tony



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From: Robert Raszuk <robert@raszuk.net>
Date: Mon, 27 Apr 2020 21:40:19 +0200
Message-ID: <CAOj+MMEKh6KE0PrhugOaEr0RkUKq=ihaKC-ngXkszT+zpv1yDg@mail.gmail.com>
To: Tony Li <tony.li@tony.li>
Cc: Bruno Decraene <bruno.decraene@orange.com>,  "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>, "lsr@ietf.org" <lsr@ietf.org>,  "Acee Lindem (acee)" <acee@cisco.com>, Tony Przygienda <tonysietf@gmail.com>
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Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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>
> > Perhaps such flag to "slow down guys" could be send by receiver
> uniformly to all peers when under LSP flooding congestion ?
>
> That=E2=80=99s effectively what we=E2=80=99re proposing, tho it need not =
be a binary
> flag.  It allows us to do simpler things saying =E2=80=9Cwe=E2=80=99re ru=
nning out of
> buffer space, please slow down a bit=E2=80=9D. Again the goal is to find =
the
> optimal goodput.  Granularity in the feedback will be helpful.
>

Apologies if I missed it but so far I understood that the new signalling
from the receiver could be different per each LSP sender (per each Hello).

Above I am suggesting that such signalling to be "global" per receiver
(ie.sent identical to all LSP senders) under moments of stress/congestion.

Robert.

--000000000000359bae05a44ae3fd
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<div dir=3D"ltr"><div class=3D"gmail_quote"><blockquote class=3D"gmail_quot=
e" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204)=
;padding-left:1ex">&gt; Perhaps such flag to &quot;slow down guys&quot; cou=
ld be send by receiver uniformly to all peers when under LSP flooding conge=
stion ?<br><br>
That=E2=80=99s effectively what we=E2=80=99re proposing, tho it need not be=
 a binary flag.=C2=A0 It allows us to do simpler things saying =E2=80=9Cwe=
=E2=80=99re running out of buffer space, please slow down a bit=E2=80=9D. A=
gain the goal is to find the optimal goodput.=C2=A0 Granularity in the feed=
back will be helpful.<br></blockquote><div><br></div><div>Apologies if I mi=
ssed it but so far I understood that the new signalling from the receiver c=
ould be different per each LSP sender (per each Hello).=C2=A0</div><div><br=
></div><div>Above I am suggesting that such signalling to be &quot;global&q=
uot; per receiver (ie.sent identical to all LSP senders) under moments of s=
tress/congestion.=C2=A0</div><div><br></div><div>Robert.</div><div><br></di=
v><div><br></div><div><br></div><div>=C2=A0</div></div></div>

--000000000000359bae05a44ae3fd--


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To: Robert Raszuk <robert@raszuk.net>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/JwgBvPEZP18oVmo7cd8Myg9QzmU>
Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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Robert,

> Apologies if I missed it but so far I understood that the new =
signalling from the receiver could be different per each LSP sender (per =
each Hello).=20


Correct.  We propose to piggyback feedback information in IIH=E2=80=99s, =
and *SNPs.


> Above I am suggesting that such signalling to be "global" per receiver =
(ie.sent identical to all LSP senders) under moments of =
stress/congestion.=20


How does that help?

Also, in systems where the area multiple forwarding plane silicon =
instances, the resources for two different interfaces may have very =
different control plane resources available.  A single response would =
not allow the receiver to accurately describe his situation.

Tony



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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Link State Routing WG of the IETF.

        Title           : Signaling Entropy Label Capability and Entropy Readable Label Depth Using IS-IS
        Authors         : Xiaohu Xu
                          Sriganesh Kini
                          Peter Psenak
                          Clarence Filsfils
                          Stephane Litkowski
                          Matthew Bocci
	Filename        : draft-ietf-isis-mpls-elc-12.txt
	Pages           : 8
	Date            : 2020-04-28

Abstract:
   Multiprotocol Label Switching (MPLS) has defined a mechanism to load-
   balance traffic flows using Entropy Labels (EL).  An ingress Label
   Switching Router (LSR) cannot insert ELs for packets going into a
   given Label Switched Path (LSP) unless an egress LSR has indicated
   via signaling that it has the capability to process ELs, referred to
   as the Entropy Label Capability (ELC), on that tunnel.  In addition,
   it would be useful for ingress LSRs to know each LSR's capability for
   reading the maximum label stack depth and performing EL-based load-
   balancing, referred to as Entropy Readable Label Depth (ERLD).  This
   document defines a mechanism to signal these two capabilities using
   IS-IS.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-isis-mpls-elc/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-isis-mpls-elc-12
https://datatracker.ietf.org/doc/html/draft-ietf-isis-mpls-elc-12

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-isis-mpls-elc-12


Please note that it may take a couple of minutes from the time of submission
until the htmlized version and diff are available at tools.ietf.org.

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From: Mohit Sethi M <mohit.m.sethi@ericsson.com>
To: "Acee Lindem (acee)" <acee@cisco.com>, "gen-art@ietf.org" <gen-art@ietf.org>
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: Mohit Sethi M <mohit.m.sethi@ericsson.com>, "gen-art@ietf.org" <gen-art@ietf.org>
CC: "lsr@ietf.org" <lsr@ietf.org>, "draft-ietf-isis-mpls-elc.all@ietf.org" <draft-ietf-isis-mpls-elc.all@ietf.org>, "last-call@ietf.org" <last-call@ietf.org>
Thread-Topic: Genart last call review of draft-ietf-isis-mpls-elc-11
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Subject: Re: [Lsr] Genart last call review of draft-ietf-isis-mpls-elc-11
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Subject: [Lsr] Congestion (flow) control thoughts.
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--=-=-=
Content-Type: text/plain; format=flowed

[As WG member]

I like the start these drafts are making, I have a few thoughts.

- I think its worthwhile work and as a WG we should end up adopting a draft or drafts that try to solve the problem.
- Congestion control is hard, and a very well studied problem, as such whatever we end up should reference prior-art to justify it's claims.
- Data, whatever solution we end up with needs to have data to back up it's claims.

** draft-ginsberg-lsr-isis-flooding-scale

Having just recently offered a, "CC algorithm is local so we aren't specifying it", in some unrelated work, I discovered (correctly so) that it was not sufficient (see [*] for the resulting changes if curious). One needs to provide (doesn't need to be normative) a working algorithm to prove that the protocol is providing enough information to the transmitter to actually implement a viable CC algorithm.

Now draft-ginsberg does suggest an algorithm, however only for P2P. We need to address LAN as well. This also needs references on how this algorithm relates to existing studied work, and perhaps most importantly some data showing that it actually works.

Without this it will almost for sure not clear the IESG (in particular Transport AD review), and rightly so. :)

** draft-decraene-lsr-isis-flooding-speed-03

I read this draft as providing feedback to transmitters on ways to modify the parameters of their CC algorithm. It doesn't actually seem in conflict with draft-ginsberg (or doesn't need to be) to me. I believe it's following the path of least resistance in utilizing existing IS-IS parameters. I wonder if we could be more adventurous here.

** Both

Both drafts mention trying to increase the ACK rate. I think we need to look deeply into this, as this is critical information for CC algorithms. It very well could be that we do not need protocol changes as the protocol provides an ACK (or NACK for LANs), but I also don't think changes or additions should be verboten either if they could provide significant improvements.

In the algorithms we propose or envision we need to be considering the affect of larger RTT on the algorithm for slow or long distant links (radios, satellites, long-haul fibers, etc).

Thanks,
Chris.
[As WG member]

[*] - https://tools.ietf.org/html/draft-hopps-ipsecme-iptfs-01#section-3
      https://tools.ietf.org/html/draft-hopps-ipsecme-iptfs-01#appendix-B),

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From: Gyan Mishra <hayabusagsm@gmail.com>
Date: Wed, 29 Apr 2020 11:59:52 -0400
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Subject: [Lsr] LSR Interim meeting webex link
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--0000000000008e2cff05a4700ab4
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All

Are we having an interim meeting today.

Please forward webex link.

The Link State Routing (lsr) Working Group will hold
a virtual interim meeting on 2020-04-29 from 10:00 to 12:00 America/Detroit.

Agenda:
Second LSR Virtual IETF 107 meeting date.

Thanks

Gyan
Verizon
Cell 301 502-1347
-- 

Gyan  Mishra

Network Engineering & Technology

Verizon

Silver Spring, MD 20904

Phone: 301 502-1347

Email: gyan.s.mishra@verizon.com

--0000000000008e2cff05a4700ab4
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<div dir=3D"auto"><br></div><div dir=3D"auto">All</div><div dir=3D"auto"><b=
r></div><div dir=3D"auto">Are we having an interim meeting today.</div><div=
 dir=3D"auto"><br></div><div dir=3D"auto">Please forward webex link.</div><=
div dir=3D"auto"><br></div><div dir=3D"auto"><span style=3D"color:rgb(49,49=
,49);word-spacing:1px">The Link State Routing (lsr) Working Group will hold=
</span><br style=3D"color:rgb(49,49,49);word-spacing:1px"><span style=3D"co=
lor:rgb(49,49,49);word-spacing:1px">a virtual interim meeting on 2020-04-29=
 from 10:00 to 12:00 America/Detroit.</span><br style=3D"color:rgb(49,49,49=
);word-spacing:1px"><br style=3D"color:rgb(49,49,49);word-spacing:1px"><spa=
n style=3D"color:rgb(49,49,49);word-spacing:1px">Agenda:</span><br style=3D=
"color:rgb(49,49,49);word-spacing:1px"><span style=3D"color:rgb(49,49,49);w=
ord-spacing:1px">Second LSR Virtual IETF 107 meeting date.</span><br></div>=
<div dir=3D"auto"><span style=3D"color:rgb(49,49,49);word-spacing:1px"><br>=
</span></div><div dir=3D"auto"><span style=3D"color:rgb(49,49,49);word-spac=
ing:1px">Thanks=C2=A0</span></div><div dir=3D"auto"><span style=3D"color:rg=
b(49,49,49);word-spacing:1px"><br></span></div><div dir=3D"auto"><span styl=
e=3D"color:rgb(49,49,49);word-spacing:1px">Gyan=C2=A0</span></div><div dir=
=3D"auto"><span style=3D"color:rgb(49,49,49);word-spacing:1px">Verizon=C2=
=A0</span></div><div dir=3D"auto"><span style=3D"color:rgb(49,49,49);word-s=
pacing:1px">Cell 301 502-1347</span></div>-- <br><div dir=3D"ltr" class=3D"=
gmail_signature" data-smartmail=3D"gmail_signature"><div dir=3D"ltr"><div><=
div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=
=3D"ltr"><div dir=3D"ltr"><div><p class=3D"MsoNormal"><font face=3D"georgia=
, serif"><font size=3D"1" color=3D"#000000">G</font><font size=3D"1" color=
=3D"#000000">yan=C2=A0 Mishra</font></font></p><p class=3D"MsoNormal"><font=
 size=3D"1" color=3D"#000000" face=3D"georgia, serif">Network Engineering &=
amp; Technology=C2=A0</font></p><p class=3D"MsoNormal"><font size=3D"1" col=
or=3D"#000000" face=3D"georgia, serif">Verizon=C2=A0</font></p><p class=3D"=
MsoNormal"><font size=3D"1" color=3D"#000000" face=3D"georgia, serif">Silve=
r Spring, MD 20904</font></p><p class=3D"MsoNormal"><font size=3D"1" color=
=3D"#000000" face=3D"georgia, serif">Phone: 301 502-1347</font></p><p class=
=3D"MsoNormal"><font size=3D"1" color=3D"#000000" face=3D"georgia, serif">E=
mail: <a href=3D"mailto:gyan.s.mishra@verizon.com" target=3D"_blank">gyan.s=
.mishra@verizon.com</a></font></p><p class=3D"MsoNormal"><br></p></div><div=
><br></div></div></div></div></div></div></div></div></div></div>

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From: <bruno.decraene@orange.com>
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Thread-Topic: Research acitivity on IS-IS flooding
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Hi all,

Following the meeting today, and the first results with existing algorithm,=
 it would a priori be interesting to have simulations or implementations te=
sts results on the proposed algorithms.

This email is a call to for info / contribution on this.

-          Do you know research team(s) which would have the required knowl=
edge/capability?

-          Would you be interested in contributing (simulation or implement=
ation or testing)?

-          Are you aware of open source IS-IS implementation(s) that could =
be used to implement this?

-          ...

Also I'm biased, I'd agree with John that this would make a good paper. Wit=
h real interest from the industry, from both vendors and operators.

Thanks,
--Bruno

___________________________________________________________________________=
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<div class=3D"WordSection1">
<p class=3D"MsoNormal">Hi all,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-U=
S">Following the meeting today, and the first results with existing algorit=
hm, it would a priori be interesting to have simulations or implementations=
 tests results on the proposed algorithms.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-U=
S"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-U=
S">This email is a call to for info / contribution on this.<o:p></o:p></spa=
n></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo2"><![if !supportLists]><span lang=3D"EN-US" style=3D"mso-ascii-font-=
family:Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibr=
i;mso-bidi-font-family:Calibri;mso-ansi-language:EN-US"><span style=3D"mso-=
list:Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"mso-ansi-langu=
age:EN-US">Do you know research team(s) which would have the required knowl=
edge/capability?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo2"><![if !supportLists]><span lang=3D"EN-US" style=3D"mso-ascii-font-=
family:Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibr=
i;mso-bidi-font-family:Calibri;mso-ansi-language:EN-US"><span style=3D"mso-=
list:Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"mso-ansi-langu=
age:EN-US">Would you be interested in contributing (simulation or implement=
ation or testing)?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo2"><![if !supportLists]><span lang=3D"EN-US" style=3D"mso-ascii-font-=
family:Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibr=
i;mso-bidi-font-family:Calibri;mso-ansi-language:EN-US"><span style=3D"mso-=
list:Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"mso-ansi-langu=
age:EN-US">Are you aware of open source IS-IS implementation(s) that could =
be used to implement this?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo2"><![if !supportLists]><span lang=3D"EN-US" style=3D"mso-ascii-font-=
family:Calibri;mso-fareast-font-family:Calibri;mso-hansi-font-family:Calibr=
i;mso-bidi-font-family:Calibri;mso-ansi-language:EN-US"><span style=3D"mso-=
list:Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"mso-ansi-langu=
age:EN-US">&#8230;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-U=
S"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-U=
S">Also I&#8217;m biased, I&#8217;d agree with John that this would make a =
good paper. With real interest from the industry, from both vendors and ope=
rators.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-U=
S"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-U=
S">Thanks,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"mso-ansi-language:EN-U=
S">--Bruno<o:p></o:p></span></p>
</div>
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From: "Gengxuesong (Geng Xuesong)" <gengxuesong@huawei.com>
To: Christian Hopps <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: [Lsr] Congestion (flow) control thoughts.
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Hi,



Thank you Chris for emphasizing that congestion control is hard and more re=
ference may be necessary.

And as the the follow-up of my comments in the interim meeting, I would lik=
e to make my question more clear:

In congestion control of layer 4, it is assumed that there is a bottleneck =
in the network, and the ideal rate of the transmitters equals to a fair sha=
re of the bandwidth in the bottleneck. The flows in the network change all =
the time and so as to the ideal transmitting rate. There are some methods t=
o detect the bottleneck, for example detecting packet loss, setting ECN, RT=
T and so on. Considering that the goal of cc is to maximize the throughput =
and minimize the queuing delay, the throughput and delay could be used to c=
ompare different cc algorithms.

The problem of mine is that for CC of ISIS flooding, where is the bottlenec=
k?(maybe the receiver capability) What method of detecting could be used? (=
In my understanding, we have two options at this stage: one from the receiv=
er side and the other from the transmitter side) What is the criteria of co=
mparing? (still a little confusing for me )



Best Regards

Xuesong



-----Original Message-----

From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Christian Hopps

Sent: Wednesday, April 29, 2020 8:24 PM

To: lsr@ietf.org

Cc: chopps@chopps.org

Subject: [Lsr] Congestion (flow) control thoughts.



[As WG member]



I like the start these drafts are making, I have a few thoughts.



- I think its worthwhile work and as a WG we should end up adopting a draft=
 or drafts that try to solve the problem.

- Congestion control is hard, and a very well studied problem, as such what=
ever we end up should reference prior-art to justify it's claims.

- Data, whatever solution we end up with needs to have data to back up it's=
 claims.



** draft-ginsberg-lsr-isis-flooding-scale



Having just recently offered a, "CC algorithm is local so we aren't specify=
ing it", in some unrelated work, I discovered (correctly so) that it was no=
t sufficient (see [*] for the resulting changes if curious). One needs to p=
rovide (doesn't need to be normative) a working algorithm to prove that the=
 protocol is providing enough information to the transmitter to actually im=
plement a viable CC algorithm.



Now draft-ginsberg does suggest an algorithm, however only for P2P. We need=
 to address LAN as well. This also needs references on how this algorithm r=
elates to existing studied work, and perhaps most importantly some data sho=
wing that it actually works.



Without this it will almost for sure not clear the IESG (in particular Tran=
sport AD review), and rightly so. :)



** draft-decraene-lsr-isis-flooding-speed-03



I read this draft as providing feedback to transmitters on ways to modify t=
he parameters of their CC algorithm. It doesn't actually seem in conflict w=
ith draft-ginsberg (or doesn't need to be) to me. I believe it's following =
the path of least resistance in utilizing existing IS-IS parameters. I wond=
er if we could be more adventurous here.



** Both



Both drafts mention trying to increase the ACK rate. I think we need to loo=
k deeply into this, as this is critical information for CC algorithms. It v=
ery well could be that we do not need protocol changes as the protocol prov=
ides an ACK (or NACK for LANs), but I also don't think changes or additions=
 should be verboten either if they could provide significant improvements.



In the algorithms we propose or envision we need to be considering the affe=
ct of larger RTT on the algorithm for slow or long distant links (radios, s=
atellites, long-haul fibers, etc).



Thanks,

Chris.

[As WG member]



[*] - https://tools.ietf.org/html/draft-hopps-ipsecme-iptfs-01#section-3

      https://tools.ietf.org/html/draft-hopps-ipsecme-iptfs-01#appendix-B),

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<div class=3D"WordSection1">
<p class=3D"MsoPlainText" style=3D"line-height:150%"><span lang=3D"EN-US">H=
i,<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"line-height:150%"><span lang=3D"EN-US"><=
o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"line-height:150%"><span lang=3D"EN-US">T=
hank you Chris for emphasizing that congestion control is hard and more ref=
erence may be necessary.<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"line-height:150%"><span lang=3D"EN-US">A=
nd as the the follow-up of my comments in the interim meeting, I would like=
 to make my question more clear:<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"line-height:150%"><span lang=3D"EN-US">I=
n congestion control of layer 4, it is assumed that there is a bottleneck i=
n the network, and the ideal rate of the transmitters equals to a fair shar=
e of the bandwidth in the bottleneck.
 The flows in the network change all the time and so as to the ideal transm=
itting rate. There are some methods to detect the bottleneck, for example d=
etecting packet loss, setting ECN, RTT and so on. Considering that the goal=
 of cc is to maximize the throughput
 and minimize the queuing delay, the throughput and delay could be used to =
compare different cc algorithms.<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"line-height:150%"><span lang=3D"EN-US">T=
he problem of mine is that for CC of ISIS flooding, where is the bottleneck=
?(maybe the receiver capability) What method of detecting could be used? (I=
n my understanding, we have two options
 at this stage: one from the receiver side and the other from the transmitt=
er side) What is the criteria of comparing? (still a little confusing for m=
e )<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"line-height:150%"><span lang=3D"EN-US"><=
o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText" style=3D"line-height:150%"><span lang=3D"EN-US">B=
est Regards<o:p></o:p></span></p>
<p class=3D"MsoPlainText" style=3D"line-height:150%"><span lang=3D"EN-US">X=
uesong<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">-----Original Message-----<o=
:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">From: Lsr [mailto:lsr-bounce=
s@ietf.org] On Behalf Of Christian Hopps<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Sent: Wednesday, April 29, 2=
020 8:24 PM<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">To: lsr@ietf.org<o:p></o:p><=
/span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Cc: chopps@chopps.org<o:p></=
o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Subject: [Lsr] Congestion (f=
low) control thoughts.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">[As WG member]<o:p></o:p></s=
pan></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">I like the start these draft=
s are making, I have a few thoughts.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">- I think its worthwhile wor=
k and as a WG we should end up adopting a draft or drafts that try to solve=
 the problem.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">- Congestion control is hard=
, and a very well studied problem, as such whatever we end up should refere=
nce prior-art to justify it's claims.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">- Data, whatever solution we=
 end up with needs to have data to back up it's claims.<o:p></o:p></span></=
p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">** draft-ginsberg-lsr-isis-f=
looding-scale<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Having just recently offered=
 a, &quot;CC algorithm is local so we aren't specifying it&quot;, in some u=
nrelated work, I discovered (correctly so) that it was not sufficient (see =
[*] for the resulting changes if curious). One
 needs to provide (doesn't need to be normative) a working algorithm to pro=
ve that the protocol is providing enough information to the transmitter to =
actually implement a viable CC algorithm.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Now draft-ginsberg does sugg=
est an algorithm, however only for P2P. We need to address LAN as well. Thi=
s also needs references on how this algorithm relates to existing studied w=
ork, and perhaps most importantly some
 data showing that it actually works.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Without this it will almost =
for sure not clear the IESG (in particular Transport AD review), and rightl=
y so. :)<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">** draft-decraene-lsr-isis-f=
looding-speed-03<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">I read this draft as providi=
ng feedback to transmitters on ways to modify the parameters of their CC al=
gorithm. It doesn't actually seem in conflict with draft-ginsberg (or doesn=
't need to be) to me. I believe it's
 following the path of least resistance in utilizing existing IS-IS paramet=
ers. I wonder if we could be more adventurous here.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">** Both<o:p></o:p></span></p=
>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Both drafts mention trying t=
o increase the ACK rate. I think we need to look deeply into this, as this =
is critical information for CC algorithms. It very well could be that we do=
 not need protocol changes as the protocol
 provides an ACK (or NACK for LANs), but I also don't think changes or addi=
tions should be verboten either if they could provide significant improveme=
nts.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">In the algorithms we propose=
 or envision we need to be considering the affect of larger RTT on the algo=
rithm for slow or long distant links (radios, satellites, long-haul fibers,=
 etc).<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Thanks,<o:p></o:p></span></p=
>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">Chris.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">[As WG member]<o:p></o:p></s=
pan></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">[*] - https://tools.ietf.org=
/html/draft-hopps-ipsecme-iptfs-01#section-3<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span lang=3D"EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p; https://tools.ietf.org/html/draft-hopps-ipsecme-iptfs-01#appendix-B),<o:=
p></o:p></span></p>
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Date: Thu, 30 Apr 2020 15:57:36 +0200
From: Henk Smit <henk.ietf@xs4all.nl>
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Subject: [Lsr] Why only a congestion-avoidance algorithm on the sender isn't enough
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Hello all,

Two years ago, Gunter Van de Velde and myself published this draft:
https://tools.ietf.org/html/draft-hsmit-lsr-isis-flooding-over-tcp-00
That started this discussion about flow/congestion control and ISIS 
flooding.

My thoughts were that once we start implementing new algorithms to
optimize ISIS flooding speed, we'll end up with our own version of TCP.
I think most people here have a good general understanding of TCP.
But if not, this is a good overview how TCP does it:
https://en.wikipedia.org/wiki/TCP_congestion_control


What does TCP do:
====
TCP does 2 things: flow control and congestion control.

1) Flow control is: the receiver trying to prevent itself from being
overloaded. The receiver indicates, through the receiver-window-size
in the TCP acks, how much data it can or wants to receive.
2) Congestion control is: the sender trying to prevent the links between
sender and receiver from being overloaded. The sender makes an educated
guess at what speed it can send.


The part we seem to be missing:
====
For the sender to make a guess at what speed it can send, it looks at
how the transmission is behaving. Are there drops ? What is the RTT ?
Do drop-percentage and RTT change ? Do acks come in at the same rate
as the sender sends segments ? Are there duplicate acks ? To be able
to do this, the sender must know what to expect. How acks behave.

If you want an ISIS sender to make a guess at what speed it can send,
without changing the protocol, the only thing the sender can do is look
at the PSNPs that come back from the receiver. But the RTT of PSNPs can
not be predicted. Because a good ISIS implementation does not 
immediately
send a PSNP when it receives a LSP. 1) the receiver should jitter the 
PSNP,
like it should jitter all packets. And 2) the receiver should wait a 
little
to see if it can combine multiple acks into a single PSNP packet.

In TCP, if a single segment gets lost, each new segment will cause the
receiver to send an ack with the seqnr of the last received byte. This
is called "duplicate acks". This triggers the sender to do
fast-retransmission. In ISIS, this can't be be done. The information
a sender can get from looking at incoming PSNPs is a lot less than what
TCP can learn from incoming acks.


The problem with sender-side congestion control:
====
In ISIS, all we know is that the default retransmit-interval is 5 
seconds.
And I think most implementations use that as the default. This means 
that
the receiver of an LSP has one requirement: send a PSNP within 5 
seconds.
For the rest, implementations are free to send PSNPs however and 
whenever
they want. This means a sender can not really make conclusions about
flooding speed, dropped LSPs, capacity of the receiver, etc.
There is no ordering when flooding LSPs, or sending PSNPs. This makes
a sender-side algorithm for ISIS a lot harder.

When you think about it, you realize that a sender should wait the
full 5 seconds before it can make any real conclusions about dropped 
LSPs.
If a sender looks at PSNPs to determine its flooding speed, it will 
probably
not be able to react without a delay of a few seconds. A sender might 
send
hunderds or thousands of LSPs in those 5 seconds, which might all or
partially be dropped, complicating matters even further.


A sender-sider algorithm should specify how to do PSNPs.
====
So imho a sender-side only algorithm can't work just like that in a
multi-vendor environment. We must not only specify a congestion-control
algorithm for the sender. We must also specify for the receiver a more
specific algorithm how and when to send PSNPs. At least how to do PSNPs
under load.

Note that this might result in the receiver sending more (and smaller) 
PSNPs.
More packets might mean more congestion (inside routers).


Will receiver-side flow-control work ?
====
I don't know if that's enough. It will certainly help.

I think to tackle this problem, we need 3 parts:
1) sender-side congestion-control algorithm
2) more detailed algorithm on receiver when and how to send PSNPs
3) receiver-side flow-control mechanism

As discussed at length, I don't know if the ISIS process on the 
receiving
router can actually know if its running out of resources (buffers on
interfaces, linecards, etc). That's implementation dependent. A receiver
can definitely advertise a fixed value. So the sender has an upper bound
to use when doing congestion-control. Just like TCP has both a 
flow-control
window and a congestion-control window, and a sender uses both. Maybe 
the
receiver can even advertise a dynamic value. Maybe now, maybe only in 
the
future. An advertised upper limit seems useful to me today.


What I didn't like about our own proposal (flooding over TCP):
====
The problem I saw with flooding over TCP concerns multi-point networks 
(LANs).

When flooding over a multi-point network, setting up TCP connections
introduces serious challenges. Who are the endpoints of the TCP 
connections ?
Full mesh ? Or do all ISes on a LAN create a TCP-connection to the DIS ?
There is no backup DIS in ISIS (unlike OSPF). Things get messy quickly.

However, the other two proposals do not solve this problem either.
How will a sender-side congestion-avoidence algorithm determine whether
there were drops ? There are no acks (PSNPs) on a LAN. We assume most 
LSPs
that are broadcasted are received by all other ISes on the LAN. There 
are
no acks. Only after the DIS has sent its periodic CSNPs, ISes can send
PSNPs to request retransmissions. It seems impossible (or very hard) to
me for all ISes on a LAN to keep track of dropped LSPs and adjust their
sending speed accordingly.

When flooding on a LAN, the receiver-side algorithm seems best. Because
all ISes can see what the lowest advertised sending-speed is. And make
sure they send slow enough to not overload the slowest IS. I'm not sure
this is a good solution, but is seems easier and more realistic than
ISIS-flooding-over-TCP or sender-side congestion-avoidance.


My conclusion:
====
Sender-side congestion-control won't work without specifying in more
detail how and when to send PSNPs.
Receiver-side flow-control will certainly help. I dont' know if it's
good enough. I don't know if advertising a static value is good enough.
But it's a start.

I still think we'll end up re-implementing a new (and weaker) TCP.


henk.


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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "ppsenak@cisco.com" <ppsenak@cisco.com>, "shraddha@juniper.net" <shraddha@juniper.net>, "cfilsfil@cisco.com" <cfilsfil@cisco.com>, "ketant@cisco.com" <ketant@cisco.com>, "arkadiy.gulko@thomsonreuters.com" <arkadiy.gulko@thomsonreuters.com>
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Thread-Topic: SRLG usage in the IGP Flexible Algorithm draft
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Subject: [Lsr] SRLG usage in the IGP Flexible Algorithm draft
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Hi all,
I have a question about the proposed usage of SRLG in the IGP Flexible Alg=
orithm<https://tools.ietf.org/html/draft-ietf-lsr-flex-algo-07> draft.

This usage is defined Section 12 of the draft with the reference to the SR=
LG exclude rule as following:



      2.  Check if any exclude SRLG rule is part of the Flex-Algorithm

      definition.  If such exclude rule exists, check if the link is

      part of any SRLG that is also part of the SRLG exclude rule.  If

      the link is part of such SRLG, the link MUST be pruned from the

      computation.

This looks effectively undistinguishable from the usage of the exclude Adm=
in groups rule as described in the same Section 12 of the draft:


      1.  Check if any exclude rule is part of the Flex-Algorithm

      definition.  If such exclude rule exists, check if any color that

      is part of the exclude rule is also set on the link.  If such a

      color is set, the link MUST be pruned from the computation.

>From my POV, with such a definition, there is no need in the dedicated "Ex=
clude SRLG" rule as part of the specification of the Flexible Algorithm, s=
ince such the SRLG Exclude rule can be replaced with a matching Exclude Al=
l rule  using Admin groups.

I also think that such a usage of SRLG does not fit the needs of the TI-LF=
A<https://tools.ietf.org/html/draft-ietf-rtgwg-segment-routing-ti-lfa-03> =
draft that considers an SRLG as a resource that fails when any of the link=
s/nodes comprising it fails. E.g., it says in Section 2:


   The Point of Local Repair (PLR), S, needs to find a node Q (a repair

   node) that is capable of safely forwarding the traffic to a

   destination D affected by the failure of the protected link L, a set

   of links including L (SRLG), or the node F itself.  The PLR also

   needs to find a way to reach Q without being affected by the

   convergence state of the nodes over the paths it wants to use to

   reach Q: the PLR needs a loop-free path to reach Q.



To me this suggests that SRLGs are only relevant when computing backup pat=
hs for specific failures, e.g., an LFA for failure of a link hat belongs t=
o a specific SRLG must be computed in the topology from which all the link=
s belonging to the same SRLG are pruned. This understanding matches RFC 40=
90 that states in Section 6.2 "Procedures for Backup Path Computation":



      - The backup LSP cannot traverse the downstream node and/or link

        whose failure is being protected against.  Note that if the PLR

        is the penultimate hop, node protection is not possible, and

        only the downstream link can be avoided.  The backup path may be

        computed to be SRLG disjoint from the downstream node and/or

        link being avoided.



If SRLGs are only relevant for computation of backup paths, it is not clea=
r to me if they should be part of the definition of a specific Flexible Al=
gorithm.



What, if anything, did I miss?



Regards, and lots of thanks in advance,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com


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<div class=3D"WordSection1">
<p class=3D"MsoNormal">Hi all,<o:p></o:p></p>
<p class=3D"MsoNormal">I have a question about the proposed usage of SRLG =
in the <a href=3D"https://tools.ietf.org/html/draft-ietf-lsr-flex-algo-07"=
>
IGP Flexible Algorithm</a> draft.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">This usage is defined Section 12 of the draft with =
the reference to the SRLG exclude rule as following:<o:p></o:p></p>
<pre><span style=3D"color:black"><br><br><o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 2.&nbsp; C=
heck if any exclude SRLG rule is part of the Flex-Algorithm<o:p></o:p></sp=
an></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; definition=
.&nbsp; If such exclude rule exists, check if the link is<o:p></o:p></span=
></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; part of an=
y SRLG that is also part of the SRLG exclude rule.&nbsp; If<o:p></o:p></sp=
an></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; the link i=
s part of such SRLG, the link MUST be pruned from the<o:p></o:p></span></p=
re>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; computatio=
n.<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">This looks effectively undistinguishable from the u=
sage of the exclude Admin groups rule as described in the same Section 12 =
of the draft:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 1.&nbsp; C=
heck if any exclude rule is part of the Flex-Algorithm<o:p></o:p></span></=
pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; definition=
.&nbsp; If such exclude rule exists, check if any color that<o:p></o:p></s=
pan></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; is part of=
 the exclude rule is also set on the link.&nbsp; If such a<o:p></o:p></spa=
n></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; color is s=
et, the link MUST be pruned from the computation.<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">From my POV, with such a definition, there is no ne=
ed in the dedicated &#8220;Exclude SRLG&#8221; rule as part of the specifi=
cation of the Flexible Algorithm, since such the SRLG Exclude rule can be =
replaced with a matching Exclude All rule&nbsp; using
 Admin groups.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I also think that such a usage of SRLG does not fit=
 the needs of the
<a href=3D"https://tools.ietf.org/html/draft-ietf-rtgwg-segment-routing-ti=
-lfa-03">
TI-LFA</a> draft that considers an SRLG as a resource that fails when any =
of the links/nodes comprising it fails. E.g., it says in Section 2:<o:p></=
o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre><span style=3D"color:black">&nbsp;&nbsp; The Point of Local Repair (P=
LR), S, needs to find a node Q (a repair<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; node) that is capable of saf=
ely forwarding the traffic to a<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; destination D affected by th=
e failure of the protected link L, <span style=3D"background:yellow;mso-hi=
ghlight:yellow">a set<o:p></o:p></span></span></pre>
<pre><span style=3D"color:black;background:yellow;mso-highlight:yellow">&n=
bsp;&nbsp; of links including L (SRLG)</span><span style=3D"color:black">,=
 or the node F itself.&nbsp; The PLR also<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; needs to find a way to reach=
 Q without being affected by the<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; convergence state of the nod=
es over the paths it wants to use to<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; reach Q: the PLR needs a loo=
p-free path to reach Q.<o:p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-=
serif">To me this suggests that SRLGs are only relevant when computing bac=
kup paths for specific failures, e.g., an LFA for failure of a link hat be=
longs to a specific SRLG must be computed in the topology from which all t=
he links belonging to the same SRLG are pruned. This understanding matches=
 RFC 4090 that states in Section 6.2 &#8220;Procedures for Backup Path Com=
putation&#8221;:<o:p></o:p></span></pre>
<pre><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-=
serif"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; - The back=
up LSP cannot traverse the downstream node and/or link<o:p></o:p></span></=
pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
; whose failure is being protected against.&nbsp; Note that if the PLR<o:p=
></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
; is the penultimate hop, node protection is not possible, and<o:p></o:p><=
/span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
; only the downstream link can be avoided.&nbsp; <span style=3D"background=
:yellow;mso-highlight:yellow">The backup path may be<o:p></o:p></span></sp=
an></pre>
<pre><span style=3D"color:black;background:yellow;mso-highlight:yellow">&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; computed to be SRLG disjoint from=
 the downstream node and/or<o:p></o:p></span></pre>
<pre><span style=3D"color:black;background:yellow;mso-highlight:yellow">&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; link being avoided</span><span st=
yle=3D"color:black">.<o:p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-=
serif">If SRLGs are only relevant for computation of backup paths, it is n=
ot clear to me if they should be part of the definition of a specific Flex=
ible Algorithm.<o:p></o:p></span></pre>
<pre><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-=
serif"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-=
serif">What, if anything, did I miss?<o:p></o:p></span></pre>
<pre><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-=
serif"><o:p>&nbsp;</o:p></span></pre>
<pre><span=20style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,san=
s-serif">Regards, and lots of thanks in advance,</span><o:p></o:p></pre>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Office: &#43;972-39266302<o:p></o:p></p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266=
302<o:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; Alexander.Vainshtein@ecitele.com=
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<br clear=3D"both">
__________________________________________________________________________=
_<BR>
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This e-mail message is intended for the recipient only and contains inform=
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To: "Gengxuesong (Geng Xuesong)" <gengxuesong@huawei.com>
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Subject: Re: [Lsr] Congestion (flow) control thoughts.
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Hi Xuesong,

> In congestion control of layer 4, it is assumed that there is a =
bottleneck in the network, and the ideal rate of the transmitters equals =
to a fair share of the bandwidth in the bottleneck. The flows in the =
network change all the time and so as to the ideal transmitting rate. =
There are some methods to detect the bottleneck, for example detecting =
packet loss, setting ECN, RTT and so on. Considering that the goal of cc =
is to maximize the throughput and minimize the queuing delay, the =
throughput and delay could be used to compare different cc algorithms.


I consider flow control and congestion control to be separate, but =
similar problems.

Flow control is about creating a single control loop between a single =
transmitter and single receiver.

Congestion control is about creating multiple interacting control loops =
between multiple transmitters and multiple receivers.


> The problem of mine is that for CC of ISIS flooding, where is the =
bottleneck?(maybe the receiver capability) What method of detecting =
could be used? (In my understanding, we have two options at this stage: =
one from the receiver side and the other from the transmitter side) What =
is the criteria of comparing? (still a little confusing for me )


In the case of modern IS-IS, we have gigabit links everywhere, the =
bandwidth greatly exceeds our needs, and flooding only happens between =
peers, so link resources are never the issue.  Thus, to my mind, =
congestion only happens when a node is engaged in flooding on multiple =
interfaces concurrently. Effectively, congestion control can be seen as =
flow control with shared resources, or as flow control with varying =
resources.

The resources of concern vary depending on the internals of both the =
sender and receiver.  Some that come to mind are:

- CPU. Both transmitter and receiver have finite cycles available. This =
is typically shared across multiple interfaces, so can congest.

- Process level buffer space. There may be a fixed number of packet =
buffers within the IS-IS process.  These can be depleted.

- Kernel buffers.=20

- Internal control fabric. In some multi-chassis designs, the line card =
chassis is remote from the CPU running IS-IS. The network between the =
two can congest.

- Line card CPU. Again in the case of a multi-chassis system, control =
packets may flow through a CPU on the line card.  This can congest due =
to cycles or buffers.

- Forwarding plane buffers. Modern design for many systems has a =
forwarding plane ASIC doing a great deal of our packet handling.=20
  One of its responsibilities is to extract control plane traffic from =
incoming traffic and pass it upwards. As a single ASIC, it is finite and =
can only buffer
  so many packets before loss.  The buffers are only cleared when the =
packets are read out by the line card or central CPU.  IMHO, this is a =
very likely point of congestion.

All of these can be instrumented to determine whether they are =
congesting.  It seems very unlikely that the transmitter ever congests.  =
Bruno=E2=80=99s data as presented supports this: the transmitter can =
outstrip the receiver. Thus, we tend to focus on congestion at the =
receiver.

The other feedback mechanisms that we have available are the ones that =
we=E2=80=99ve discussed: PSNPs provide acknowledgment of received =
packets. =46rom that, and their timing, we may be able to infer more =
useful data, but we are discussing changing their behavior to make =
things more useful.

In our draft, we are proposing other feedback mechanisms.

Tony



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Reviewer: Rich Salz
Review result: Ready

I am the SECDIR reviewer for this document; the security directorate tries to
review all documents before they go to the IESG. This content is intended
primarily for the SecAD's, anyone else should consider this like other
last-call comments.

This document is READY.

This is a short doument. It defines a way for MPLS routers to indicate that
they can handle additional meta-data, "entropy labels" and depth of them, to do
traffic routing.

The security implications of this are well-discussed.




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Reviewer: Joseph Salowey
Review result: Ready

I have reviewed this document as part of the security directorate's
ongoing effort to review all IETF documents being processed by the
IESG.  These comments were written primarily for the benefit of the
security area directors.  Document editors and WG chairs should treat
these comments just like any other last call comments.

The summary of the review is ready from a security perspective.  The security
considerations section is adequate.


