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From: "Van De Velde, Gunter (Nokia - BE/Antwerp)" <gunter.van_de_velde@nokia.com>
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CC: "draft-ietf-lsvr-bgp-spf@ietf.org" <draft-ietf-lsvr-bgp-spf@ietf.org>
Thread-Topic: [Lsvr] I-D Action: draft-ietf-lsvr-bgp-spf-01.txt
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/pvQdzJHhlbG7yZmEw9OuoD_gWHQ>
Subject: Re: [Lsr] [Lsvr] I-D Action: draft-ietf-lsvr-bgp-spf-01.txt
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Hi All,

Friday 8 June LSVR WG will have a 90 minute interim meeting to discuss the =
updates/feedback/next-steps regarding drafts:

https://www.ietf.org/id/draft-ietf-lsvr-bgp-spf-01.txt
and
https://www.ietf.org/id/draft-keyupate-lsvr-applicability-01.txt

The interim is scheduled for Friday 8 June, 4:30pm CET (=3D 7:30am PDT), us=
ing Webex conference tool.

Agenda, slides and other details will be shared on the datatracker interim =
LSVR page:
https://datatracker.ietf.org/meeting/interim-2018-lsvr-01/session/lsvr

Webex details to be distributed soon in the LSVR WG email list

Brgds,
G/

-----Original Message-----
From: Lsvr [mailto:lsvr-bounces@ietf.org] On Behalf Of internet-drafts@ietf=
.org
Sent: Friday, June 1, 2018 01:40
To: i-d-announce@ietf.org
Cc: lsvr@ietf.org
Subject: [Lsvr] I-D Action: draft-ietf-lsvr-bgp-spf-01.txt


A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.
This draft is a work item of the Link State Vector Routing WG of the IETF.

        Title           : Shortest Path Routing Extensions for BGP Protocol
        Authors         : Keyur Patel
                          Acee Lindem
                          Shawn Zandi
                          Wim Henderickx
	Filename        : draft-ietf-lsvr-bgp-spf-01.txt
	Pages           : 16
	Date            : 2018-05-31

Abstract:
   Many Massively Scaled Data Centers (MSDCs) have converged on
   simplified layer 3 routing.  Furthermore, requirements for
   operational simplicity have lead many of these MSDCs to converge on
   BGP as their single routing protocol for both their fabric routing
   and their Data Center Interconnect (DCI) routing.  This document
   describes a solution which leverages BGP Link-State distribution and
   the Shortest Path First (SPF) algorithm similar to Internal Gateway
   Protocols (IGPs) such as OSPF.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-lsvr-bgp-spf/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-lsvr-bgp-spf-01
https://datatracker.ietf.org/doc/html/draft-ietf-lsvr-bgp-spf-01

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-lsvr-bgp-spf-01


Please note that it may take a couple of minutes from the time of submissio=
n 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/

_______________________________________________
Lsvr mailing list
Lsvr@ietf.org
https://www.ietf.org/mailman/listinfo/lsvr


From nobody Mon Jun  4 15:52:01 2018
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CC: lsr@ietf.org, ginsberg@cisco.com, draft-ietf-isis-segment-routing-extensions@ietf.org, chopps@chopps.org, uma.chunduri@huawei.com, acee@cisco.com
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Subject: [Lsr] [IANA #1109980] Early Allocation Extension for "IS-IS Extensions for Segment Routing" - draft-ietf-isis-segment-routing-extensions-16.txt
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Hi all, 

We've updated the expiration date for the following registrations:  

In the TLV Codepoints Registry:

149	Segment Identifier / Label Binding (TEMPORARY - registered 2016-06-29, extension registered 2018-06-04, expires 2019-06-29)	n	y	n	n	[draft-ietf-isis-segment-routing-extensions]

150	Multi-Topology Segment Identifier / Label Binding (TEMPORARY - registered 2016-06-29, extension registered 2018-06-04, expires 2019-06-29)	n	y	n	n	[draft-ietf-isis-segment-routing-extensions]

In the Sub-TLVs for TLVs 22, 23, 25, 141, 222, and 223 registry: 

31	Adjacency Segment Identifier (TEMPORARY - registered 2016-06-29, extension registered 2018-06-04, expires 2019-06-29)	y	y	n	y	y	y	[draft-ietf-isis-segment-routing-extensions]

32	LAN Adjacency Segment Identifier (TEMPORARY - registered 2016-06-29, extension registered 2018-06-04, expires 2019-06-29)	y	y	n	y	y	y	[draft-ietf-isis-segment-routing-extensions] 

In the Sub-TLVs for TLVs 135, 235, 236, and 237 registry: 

3	Prefix Segment Identifier (TEMPORARY - registered 2016-06-29, extension registered 2018-06-04, expires 2019-06-29)	y	y	y	y	[draft-ietf-isis-segment-routing-extensions]

In the Sub-TLVs for TLV 242 registry: 

2	Segment Routing Capability (TEMPORARY - registered 2016-06-29, extension registered 2018-06-04, expires 2019-06-29)	[draft-ietf-isis-segment-routing-extensions]

19	Segment Routing Algorithm (TEMPORARY - registered 2016-06-29, extension registered 2018-06-04, expires 2019-06-29)	[draft-ietf-isis-segment-routing-extensions]

We've made the following early allocations:

22	Segment Routing Local Block (SRLB) (TEMPORARY - registered 2018-06-04, expires 2019-06-04)	[draft-ietf-isis-segment-routing-extensions]

24	Segment Routing Mapping Server Preference (SRMS Preference) (TEMPORARY - registered 2018-06-04, expires 2019-06-04)	[draft-ietf-isis-segment-routing-extensions]

Please see
https://www.iana.org/assignments/isis-tlv-codepoints

Best regards, 

Sabrina Tanamal
Senior IANA Services Specialist

On Tue May 15 17:12:25 2018, acee@cisco.com wrote:
> Hi Amanda, et al,
> 
> I just communicated with Les, one of the designated experts for the
> IS-IS TLV 242 registry, and the draft requires two additional Sub-TLV
> allocations:
> 
> Sub-TLV 22 for Segment Routing Local Block (SRLB)
> Sub-TLV 24 for Segment Routing Mapping Server (SRMS) Preference
> 
> Thanks,
> Acee
> 
> From: Acee Lindem <acee@cisco.com>
> Date: Tuesday, May 15, 2018 at 10:54 AM
> To: IANA <iana@iana.org>, Alvaro Retana <aretana.ietf@gmail.com>
> Cc: Christian Hopps <chopps@chopps.org>, "lsr@ietf.org"
> <lsr@ietf.org>, "draft-ietf-isis-segment-routing-extensions@ietf.org"
> <draft-ietf-isis-segment-routing-extensions@ietf.org>, Uma Chunduri
> <uma.chunduri@huawei.com>
> Subject: Early Allocation Extension for "IS-IS Extensions for Segment
> Routing" - draft-ietf-isis-segment-routing-extensions-16.txt
> 
> Hi Amanda, et al IANA, Alvaro,
> 
> For a variety of reasons, we will not finish the subject draft by the
> end of June when the IANA allocations expire. It has just completed WG
> last call but there are many fastidious reviewers are in the path to
> completion. Please extend the allocations and add any that were not in
> the original early allocations. For example, we need the SRMS
> Preference allocated in the TLV 242 registry ASAP since we have early
> allocations to make in this registry.
> 
> Thanks,
> Acee




From nobody Tue Jun  5 04:12:10 2018
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From: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
Date: Tue, 5 Jun 2018 16:42:03 +0530
Message-ID: <CAKz0y8wnP6PsJPOCTmXOzmHBs5X=2PuXCbgLJ_BWUm3XhNmURw@mail.gmail.com>
To: "Stefano Previdi (IETF)" <s@previdi.net>
Cc: Jeff Tantsura <jefftant.ietf@gmail.com>, lsr@ietf.org
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/cMkgEb1ulV7600ryCJE1VbajfLA>
Subject: Re: [Lsr] IGP TE Metric Extensions
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=E2=80=8BPlease see inline..=E2=80=8B

On Fri, Jun 1, 2018 at 2:34 AM, Stefano Previdi (IETF) <s@previdi.net>
wrote:

>
>
> On Thu, May 31, 2018, 6:15 PM Muthu Arul Mozhi Perumal <
> muthu.arul@gmail.com> wrote:
>
>> Thanks, Jeff. Would be good to have this clarified in
>> =E2=80=8B=E2=80=8B
>> draft-ginsberg-isis-rfc7810bis. My original message seems to have been
>> stripped off, so including it again for the lsr list..
>>
>> =E2=80=8BBoth RFC 7810 and RFC 7471 say that:
>>
>>    The measurement interval, any filter coefficients, and any
>>    advertisement intervals MUST be configurable per sub-TLV.
>>
>>    Additionally, the default measurement interval for all sub-TLVs
>>    SHOULD be 30 seconds.
>>
>> However, both RFCs initially say that they only describe mechanisms for
>> disseminating performance information and methods of measurements is
>> outside their scope.
>>
>> Moreover, for a first time reader, it seems to suggest that the
>> measurement interval and filter coefficient must be supported and
>> configurable under the IGP.
>>
>
>
> No. This is not suggested in any form.
> It is clearly indicated that the draft does not deal with measurements
> which means no recommendation is made.
>
>
> In a system supporting multiple IGPs, I would expect that they be
>> implemented outside the IGP and the IGPs just disseminate the informatio=
n
>> provided to them.
>>
>> Thoughts, especially from an implementation standpoint?
>>
>
>
> Again, the draft is only about dissemination, not measurements.
>

=E2=80=8BHow is the measurement interval and filter coefficients described =
in the
draft related to dissemination?=E2=80=8B

=E2=80=8B   The measurement interval, any filter coefficients, and any
   advertisement intervals MUST be configurable per sub-TLV.

   Additionally, the default measurement interval for all sub-TLVs
   SHOULD be 30 seconds.=E2=80=8B


> If your question is related to configuration and implementation of
> measurements, well it will not be addressed by this draft.
>
> We intentionally left out this part that does not belong to the igp
> protocol machinery.
>

=E2=80=8BWhich of the functionalities described in sections 5, 6, 7 of the =
draft
belong to the IGP protocol machinery?

Regards,
Muthu


>
> s.
>
>
>
>> Regards.
>> Muthu
>>
>> On Thu, May 31, 2018 at 11:37 AM, Jeff Tantsura <jefftant.ietf@gmail.com=
>
>> wrote:
>>
>>> Muthu,
>>>
>>> LSR would be a more suitable list to post to, CCed.
>>>
>>> Regards,
>>> Jeff
>>>
>>> > On May 30, 2018, at 18:06, Muthu Arul Mozhi Perumal <
>>> muthu.arul@gmail.com> wrote:
>>> >
>>> > Muthu
>>>
>>
>> _______________________________________________
>> Lsr mailing list
>> Lsr@ietf.org
>> https://www.ietf.org/mailman/listinfo/lsr
>>
>

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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif;font-size:small"><br></div><div class=3D"gmail_extra"><d=
iv class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;=
font-size:small">=E2=80=8BPlease see inline..=E2=80=8B</div><br><div class=
=3D"gmail_quote">On Fri, Jun 1, 2018 at 2:34 AM, Stefano Previdi (IETF) <sp=
an dir=3D"ltr">&lt;<a href=3D"mailto:s@previdi.net" target=3D"_blank">s@pre=
vidi.net</a>&gt;</span> wrote:<br><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"auto"><span class=3D"gmail-"><div><br><br><div class=
=3D"gmail_quote"><div dir=3D"ltr">On Thu, May 31, 2018, 6:15 PM Muthu Arul =
Mozhi Perumal &lt;<a href=3D"mailto:muthu.arul@gmail.com" target=3D"_blank"=
>muthu.arul@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"><div style=3D"font-family:arial,helve=
tica,sans-serif;font-size:small">Thanks, Jeff. Would be good to have this c=
larified in=C2=A0<div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif;font-size:small;display:inline">=E2=80=8B=E2=80=8B</div>=
draft-ginsberg-isis-<wbr>rfc7810bis. My original message seems to have been=
 stripped off, so including it again for the lsr list..</div><div style=3D"=
font-family:arial,helvetica,sans-serif;font-size:small"><br></div><div styl=
e=3D"font-family:arial,helvetica,sans-serif;font-size:small">=E2=80=8BBoth =
RFC 7810 and RFC 7471 say that:<br></div><div><div><font face=3D"arial, hel=
vetica, sans-serif"><br></font></div><div><font face=3D"arial, helvetica, s=
ans-serif">=C2=A0 =C2=A0The measurement interval, any filter coefficients, =
and any</font></div><div><font face=3D"arial, helvetica, sans-serif">=C2=A0=
 =C2=A0advertisement intervals MUST be configurable per sub-TLV.</font></di=
v><div><font face=3D"arial, helvetica, sans-serif"><br></font></div><div><f=
ont face=3D"arial, helvetica, sans-serif">=C2=A0 =C2=A0Additionally, the de=
fault measurement interval for all sub-TLVs</font></div><div><font face=3D"=
arial, helvetica, sans-serif">=C2=A0 =C2=A0SHOULD be 30 seconds.</font></di=
v><div><font face=3D"arial, helvetica, sans-serif"><br></font></div><div><f=
ont face=3D"arial, helvetica, sans-serif">However, both RFCs initially say =
that they only describe mechanisms for disseminating performance informatio=
n and methods of measurements is outside their scope.</font></div><div><fon=
t face=3D"arial, helvetica, sans-serif"><br></font></div><div><font face=3D=
"arial, helvetica, sans-serif">Moreover, for a first time reader, it seems =
to suggest that the measurement interval and filter coefficient must be sup=
ported and configurable under the IGP.</font></div></div></div></blockquote=
></div></div><div dir=3D"auto"><br></div><div dir=3D"auto"><br></div></span=
><div dir=3D"auto">No. This is not suggested in any form.</div><div dir=3D"=
auto">It is clearly indicated that the draft does not deal with measurement=
s which means no recommendation is made.</div><span class=3D"gmail-"><div d=
ir=3D"auto"><br></div><div dir=3D"auto"><br></div><div dir=3D"auto"><div cl=
ass=3D"gmail_quote"><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 =
dir=3D"ltr"><div><div><font face=3D"arial, helvetica, sans-serif"> In a sys=
tem supporting multiple IGPs, I would expect that they be implemented outsi=
de the IGP and the IGPs just disseminate the information provided to them.<=
/font></div><div><font face=3D"arial, helvetica, sans-serif"><br></font></d=
iv><div><font face=3D"arial, helvetica, sans-serif">Thoughts, especially fr=
om an implementation standpoint?</font></div></div></div></blockquote></div=
></div><div dir=3D"auto"><br></div><div dir=3D"auto"><br></div></span><div =
dir=3D"auto">Again, the draft is only about dissemination, not measurements=
. </div></div></blockquote><div><br></div><div><div class=3D"gmail_default"=
 style=3D"font-family:arial,helvetica,sans-serif;font-size:small">=E2=80=8B=
How is the measurement interval and filter coefficients described in the dr=
aft related to dissemination?=E2=80=8B</div><br></div><div><div class=3D"gm=
ail_default"><span style=3D"font-family:arial,helvetica,sans-serif;font-siz=
e:small">=E2=80=8B</span><font face=3D"arial, helvetica, sans-serif">=C2=A0=
 =C2=A0The measurement interval, any filter coefficients, and any</font></d=
iv><div class=3D"gmail_default"><font face=3D"arial, helvetica, sans-serif"=
>=C2=A0 =C2=A0advertisement intervals MUST be configurable per sub-TLV.</fo=
nt></div><div class=3D"gmail_default"><font face=3D"arial, helvetica, sans-=
serif"><br></font></div><div class=3D"gmail_default"><font face=3D"arial, h=
elvetica, sans-serif">=C2=A0 =C2=A0Additionally, the default measurement in=
terval for all sub-TLVs</font></div><div class=3D"gmail_default"><font face=
=3D"arial, helvetica, sans-serif">=C2=A0 =C2=A0SHOULD be 30 seconds.</font>=
<span style=3D"font-family:arial,helvetica,sans-serif;font-size:small">=E2=
=80=8B</span></div></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);p=
adding-left:1ex"><div dir=3D"auto"><div dir=3D"auto">If your question is re=
lated to configuration and implementation of measurements, well it will not=
 be addressed by this draft.</div><div dir=3D"auto"><br></div><div dir=3D"a=
uto">We intentionally left out this part that does not belong to the igp pr=
otocol machinery.</div></div></blockquote><div><br></div><div><div class=3D=
"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;font-size:s=
mall">=E2=80=8BWhich of the functionalities described in sections 5, 6, 7 o=
f the draft belong to the IGP protocol machinery?</div><div class=3D"gmail_=
default" style=3D"font-family:arial,helvetica,sans-serif;font-size:small"><=
br></div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,=
sans-serif;font-size:small">Regards,</div><div class=3D"gmail_default" styl=
e=3D"font-family:arial,helvetica,sans-serif;font-size:small">Muthu</div><di=
v class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;f=
ont-size:small"><span style=3D"font-family:arial,sans-serif">=C2=A0</span><=
/div></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"au=
to"><div dir=3D"auto"><br></div><div dir=3D"auto">s.</div><div dir=3D"auto"=
><br></div><div dir=3D"auto"><br></div><div dir=3D"auto"><div class=3D"gmai=
l_quote"><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"><span class=3D"g=
mail-"><div dir=3D"ltr"><div><div><br></div></div><div style=3D"font-family=
:arial,helvetica,sans-serif;font-size:small">Regards.</div><div style=3D"fo=
nt-family:arial,helvetica,sans-serif;font-size:small">Muthu</div><div style=
=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br></div><div =
class=3D"gmail_extra"><div class=3D"gmail_quote">On Thu, May 31, 2018 at 11=
:37 AM, Jeff Tantsura <span dir=3D"ltr">&lt;<a href=3D"mailto:jefftant.ietf=
@gmail.com" rel=3D"noreferrer" target=3D"_blank">jefftant.ietf@gmail.com</a=
>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" style=3D"margin:0p=
x 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Mu=
thu,<br>
<br>
LSR would be a more suitable list to post to, CCed.<br>
<br>
Regards,<br>
Jeff<br>
<br>
&gt; On May 30, 2018, at 18:06, Muthu Arul Mozhi Perumal &lt;<a href=3D"mai=
lto:muthu.arul@gmail.com" rel=3D"noreferrer" target=3D"_blank">muthu.arul@g=
mail.com</a>&gt; wrote:<br>
&gt; <br>
&gt; Muthu<br>
</blockquote></div><br></div></div></span>
______________________________<wbr>_________________<br>
Lsr mailing list<br>
<a href=3D"mailto:Lsr@ietf.org" rel=3D"noreferrer" target=3D"_blank">Lsr@ie=
tf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferrer nor=
eferrer" target=3D"_blank">https://www.ietf.org/mailman/<wbr>listinfo/lsr</=
a><br>
</blockquote></div></div></div>
</blockquote></div><br></div></div>

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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>, "Stefano Previdi (IETF)" <s@previdi.net>
CC: "lsr@ietf.org" <lsr@ietf.org>, Jeff Tantsura <jefftant.ietf@gmail.com>
Thread-Topic: [Lsr] IGP TE Metric Extensions
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Date: Tue, 5 Jun 2018 11:30:02 +0000
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From: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
Date: Tue, 5 Jun 2018 17:18:44 +0530
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To: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
Cc: "Stefano Previdi (IETF)" <s@previdi.net>, "lsr@ietf.org" <lsr@ietf.org>, Jeff Tantsura <jefftant.ietf@gmail.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/58SP2OaD-aLl9740aQyl8WzxGaM>
Subject: Re: [Lsr] IGP TE Metric Extensions
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Sounds reasonable to me..

Adding a clarification note in the draft would be useful, IMHO.

Regards,
Muthu

On Tue, Jun 5, 2018 at 5:00 PM, Ketan Talaulikar (ketant) <ketant@cisco.com=
>
wrote:

> Hi Muthu,
>
>
>
> The Sections 5, 6 and 7 of these drafts are critical as it impacts the IG=
P
> protocol operation and stability though it is not an integral part of the
> IGP protocol machinery. This functionality in a system, whether achieved =
in
> the IGP/measurement/some-other module, is an implementation specific aspe=
ct.
>
>
>
> To answer your question, these aspects may be implemented outside the cor=
e
> IGP module and the IGPs simply flood these while satisfying the aspects
> specified in the document.
>
>
>
> Thanks,
>
> Ketan
>
>
>
> *From:* Lsr <lsr-bounces@ietf.org> *On Behalf Of *Muthu Arul Mozhi Peruma=
l
> *Sent:* 05 June 2018 16:42
> *To:* Stefano Previdi (IETF) <s@previdi.net>
> *Cc:* lsr@ietf.org; Jeff Tantsura <jefftant.ietf@gmail.com>
> *Subject:* Re: [Lsr] IGP TE Metric Extensions
>
>
>
>
>
> =E2=80=8BPlease see inline..=E2=80=8B
>
>
>
> On Fri, Jun 1, 2018 at 2:34 AM, Stefano Previdi (IETF) <s@previdi.net>
> wrote:
>
>
>
> On Thu, May 31, 2018, 6:15 PM Muthu Arul Mozhi Perumal <
> muthu.arul@gmail.com> wrote:
>
> Thanks, Jeff. Would be good to have this clarified in
>
> =E2=80=8B=E2=80=8B
>
> draft-ginsberg-isis-rfc7810bis. My original message seems to have been
> stripped off, so including it again for the lsr list..
>
>
>
> =E2=80=8BBoth RFC 7810 and RFC 7471 say that:
>
>
>
>    The measurement interval, any filter coefficients, and any
>
>    advertisement intervals MUST be configurable per sub-TLV.
>
>
>
>    Additionally, the default measurement interval for all sub-TLVs
>
>    SHOULD be 30 seconds.
>
>
>
> However, both RFCs initially say that they only describe mechanisms for
> disseminating performance information and methods of measurements is
> outside their scope.
>
>
>
> Moreover, for a first time reader, it seems to suggest that the
> measurement interval and filter coefficient must be supported and
> configurable under the IGP.
>
>
>
>
>
> No. This is not suggested in any form.
>
> It is clearly indicated that the draft does not deal with measurements
> which means no recommendation is made.
>
>
>
>
>
> In a system supporting multiple IGPs, I would expect that they be
> implemented outside the IGP and the IGPs just disseminate the information
> provided to them.
>
>
>
> Thoughts, especially from an implementation standpoint?
>
>
>
>
>
> Again, the draft is only about dissemination, not measurements..
>
>
>
> =E2=80=8BHow is the measurement interval and filter coefficients describe=
d in the
> draft related to dissemination?=E2=80=8B
>
>
>
> =E2=80=8B   The measurement interval, any filter coefficients, and any
>
>    advertisement intervals MUST be configurable per sub-TLV.
>
>
>
>    Additionally, the default measurement interval for all sub-TLVs
>
>    SHOULD be 30 seconds.=E2=80=8B
>
>
>
> If your question is related to configuration and implementation of
> measurements, well it will not be addressed by this draft.
>
>
>
> We intentionally left out this part that does not belong to the igp
> protocol machinery.
>
>
>
> =E2=80=8BWhich of the functionalities described in sections 5, 6, 7 of th=
e draft
> belong to the IGP protocol machinery?
>
>
>
> Regards,
>
> Muthu
>
>
>
>
>
> s.
>
>
>
>
>
>
>
> Regards.
>
> Muthu
>
>
>
> On Thu, May 31, 2018 at 11:37 AM, Jeff Tantsura <jefftant.ietf@gmail.com>
> wrote:
>
> Muthu,
>
> LSR would be a more suitable list to post to, CCed.
>
> Regards,
> Jeff
>
> > On May 30, 2018, at 18:06, Muthu Arul Mozhi Perumal <
> muthu.arul@gmail.com> wrote:
> >
> > Muthu
>
>
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>
>
>

--000000000000eda09b056de3a1d2
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif;font-size:small">Sounds reasonable to me..</div><div cla=
ss=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;font-s=
ize:small"><br></div><div class=3D"gmail_default" style=3D"font-family:aria=
l,helvetica,sans-serif;font-size:small">Adding a clarification note in the =
draft would be useful, IMHO.</div><div class=3D"gmail_default" style=3D"fon=
t-family:arial,helvetica,sans-serif;font-size:small"><br></div><div class=
=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;font-siz=
e:small">Regards,</div><div class=3D"gmail_default" style=3D"font-family:ar=
ial,helvetica,sans-serif;font-size:small">Muthu</div><div class=3D"gmail_ex=
tra"><br><div class=3D"gmail_quote">On Tue, Jun 5, 2018 at 5:00 PM, Ketan T=
alaulikar (ketant) <span dir=3D"ltr">&lt;<a href=3D"mailto:ketant@cisco.com=
" target=3D"_blank">ketant@cisco.com</a>&gt;</span> wrote:<br><blockquote c=
lass=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;=
padding-left:1ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"m_-7976965690842061384WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Hi Muthu,<u></u><u></u=
></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">The Sections 5, 6 and =
7 of these drafts are critical as it impacts the IGP protocol operation and=
 stability though it is not an integral part of
 the IGP protocol machinery. This functionality in a system, whether achiev=
ed in the IGP/measurement/some-other module, is an implementation specific =
aspect.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">To answer your questio=
n, these aspects may be implemented outside the core IGP module and the IGP=
s simply flood these while satisfying the aspects
 specified in the document.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Thanks,<u></u><u></u><=
/span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Ketan<u></u><u></u></s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11.0pt;font-=
family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,sans-serif">From:</span></b><span style=3D"font-size:11.0pt;=
font-family:&quot;Calibri&quot;,sans-serif"> Lsr &lt;<a href=3D"mailto:lsr-=
bounces@ietf.org" target=3D"_blank">lsr-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Muthu Arul Mozhi Perumal<br>
<b>Sent:</b> 05 June 2018 16:42<br>
<b>To:</b> Stefano Previdi (IETF) &lt;<a href=3D"mailto:s@previdi.net" targ=
et=3D"_blank">s@previdi.net</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</=
a>; Jeff Tantsura &lt;<a href=3D"mailto:jefftant.ietf@gmail.com" target=3D"=
_blank">jefftant.ietf@gmail.com</a>&gt;<br>
<b>Subject:</b> Re: [Lsr] IGP TE Metric Extensions<u></u><u></u></span></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=E2=80=8BPlease see inline..=E2=80=8B<u></u><u></u></span></p>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div><span class=3D"">
<p class=3D"MsoNormal">On Fri, Jun 1, 2018 at 2:34 AM, Stefano Previdi (IET=
F) &lt;<a href=3D"mailto:s@previdi.net" target=3D"_blank">s@previdi.net</a>=
&gt; wrote:<u></u><u></u></p>
</span><blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;pad=
ding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<div><span class=3D"">
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><u></u>=C2=A0<u></u><=
/p>
<div>
<div>
<p class=3D"MsoNormal">On Thu, May 31, 2018, 6:15 PM Muthu Arul Mozhi Perum=
al &lt;<a href=3D"mailto:muthu.arul@gmail.com" target=3D"_blank">muthu.arul=
@gmail.com</a>&gt; wrote:<u></u><u></u></p>
</div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">Thanks, Jeff. Would be good to have this clarified in=C2=A0<u></u><u><=
/u></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=E2=80=8B=E2=80=8B<u></u><u></u></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">draft-ginsberg-isis-<wbr>rfc7810bis. My original message seems to have=
 been stripped off, so including it again for the lsr list..<u></u><u></u><=
/span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=E2=80=8BBoth RFC 7810 and RFC 7471 say that:<u></u><u></u></span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=C2=A0 =C2=A0The measurement interval, any filter coefficients, and an=
y</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=C2=A0 =C2=A0advertisement intervals MUST be configurable per sub-TLV.=
</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=C2=A0 =C2=A0Additionally, the default measurement interval for all su=
b-TLVs</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=C2=A0 =C2=A0SHOULD be 30 seconds.</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">However, both RFCs initially say that they only describe mechanisms fo=
r disseminating performance information and methods of measurements is outs=
ide their scope.</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">Moreover, for a first time reader, it seems to suggest that the measur=
ement interval and filter coefficient must be supported and configurable un=
der the IGP.</span><u></u><u></u></p>
</div>
</div>
</div>
</blockquote>
</div>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">No. This is not suggested in any form.<u></u><u></u>=
</p>
</div>
<div>
<p class=3D"MsoNormal">It is clearly indicated that the draft does not deal=
 with measurements which means no recommendation is made.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">In a system supporting multiple IGPs, I would expect that they be impl=
emented outside the IGP and the IGPs just disseminate the information provi=
ded to them.</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">Thoughts, especially from an implementation standpoint?</span><u></u><=
u></u></p>
</div>
</div>
</div>
</blockquote>
</div>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</span><div>
<p class=3D"MsoNormal">Again, the draft is only about dissemination, not me=
asurements..
<u></u><u></u></p>
</div>
</div>
</blockquote><span class=3D"">
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=E2=80=8BHow is the measurement interval and filter coefficients descr=
ibed in the draft related to dissemination?=E2=80=8B<u></u><u></u></span></=
p>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=E2=80=8B=C2=A0 =C2=A0The measurement interval, any filter coefficient=
s, and any</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=C2=A0 =C2=A0advertisement intervals MUST be configurable per sub-TLV.=
</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=C2=A0 =C2=A0Additionally, the default measurement interval for all su=
b-TLVs</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=C2=A0 =C2=A0SHOULD be 30 seconds.=E2=80=8B</span><u></u><u></u></p>
</div>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<p class=3D"MsoNormal">If your question is related to configuration and imp=
lementation of measurements, well it will not be addressed by this draft.<u=
></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">We intentionally left out this part that does not be=
long to the igp protocol machinery.<u></u><u></u></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=E2=80=8BWhich of the functionalities described in sections 5, 6, 7 of=
 the draft belong to the IGP protocol machinery?<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">Regards,<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">Muthu<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">=C2=A0<u></u><u></u></span></p>
</div>
</div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">s.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">Regards.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif">Muthu<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Arial&quot;,sans-se=
rif"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal">On Thu, May 31, 2018 at 11:37 AM, Jeff Tantsura &lt;=
<a href=3D"mailto:jefftant.ietf@gmail.com" target=3D"_blank">jefftant.ietf@=
gmail.com</a>&gt; wrote:<u></u><u></u></p>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<p class=3D"MsoNormal">Muthu,<br>
<br>
LSR would be a more suitable list to post to, CCed.<br>
<br>
Regards,<br>
Jeff<br>
<br>
&gt; On May 30, 2018, at 18:06, Muthu Arul Mozhi Perumal &lt;<a href=3D"mai=
lto:muthu.arul@gmail.com" target=3D"_blank">muthu.arul@gmail.com</a>&gt; wr=
ote:<br>
&gt; <br>
&gt; Muthu<u></u><u></u></p>
</blockquote>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div>
<p class=3D"MsoNormal">______________________________<wbr>_________________=
<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/<wbr>listinfo/lsr</a><u></u><u></u></p>
</blockquote>
</div>
</div>
</div>
</blockquote>
</span></div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div>
</div>
</div>

</blockquote></div><br></div></div>

--000000000000eda09b056de3a1d2--


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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
CC: "Stefano Previdi (IETF)" <s@previdi.net>, "lsr@ietf.org" <lsr@ietf.org>, Jeff Tantsura <jefftant.ietf@gmail.com>
Thread-Topic: [Lsr] IGP TE Metric Extensions
Thread-Index: AQHT+Hu3yMVd+pXj+0u0nPyEp9to2aRJrgqAgACp1QCAAFDMgIAHNj6A//+uw9CAAFt9AP//sAyw
Date: Tue, 5 Jun 2018 12:03:59 +0000
Message-ID: <b5583439198442cdab833a798985c377@XCH-ALN-008.cisco.com>
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From: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
Date: Tue, 5 Jun 2018 17:51:50 +0530
Message-ID: <CAKz0y8whN=KSR45V6kZ=TvCNwx=BG00v2xz=Dan2yO-jhbEnSg@mail.gmail.com>
To: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
Cc: "Stefano Previdi (IETF)" <s@previdi.net>, "lsr@ietf.org" <lsr@ietf.org>, Jeff Tantsura <jefftant.ietf@gmail.com>
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Subject: Re: [Lsr] IGP TE Metric Extensions
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If these are only implementation specific aspects and shouldn't get into
the draft, what is the point of sections 5,6,7? Why would it hurt to say
what is generally expected to be part of the protocol machinery and what is
not?

BTW, any known implementation for RFC 7810, also supporting sections 5,6,7?

Regards,
Muthu

On Tue, Jun 5, 2018 at 5:33 PM, Ketan Talaulikar (ketant) <ketant@cisco.com=
>
wrote:

> Hi Muthu,
>
>
>
> These are implementation specific aspects and I am not sure if this is
> something that the draft should be getting into.
>
>
>
> Thanks,
>
> Ketan
>
>
>
> *From:* Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
> *Sent:* 05 June 2018 17:19
> *To:* Ketan Talaulikar (ketant) <ketant@cisco.com>
> *Cc:* Stefano Previdi (IETF) <s@previdi.net>; lsr@ietf.org; Jeff Tantsura
> <jefftant.ietf@gmail.com>
>
> *Subject:* Re: [Lsr] IGP TE Metric Extensions
>
>
>
> Sounds reasonable to me..
>
>
>
> Adding a clarification note in the draft would be useful, IMHO.
>
>
>
> Regards,
>
> Muthu
>
>
>
> On Tue, Jun 5, 2018 at 5:00 PM, Ketan Talaulikar (ketant) <
> ketant@cisco.com> wrote:
>
> Hi Muthu,
>
>
>
> The Sections 5, 6 and 7 of these drafts are critical as it impacts the IG=
P
> protocol operation and stability though it is not an integral part of the
> IGP protocol machinery. This functionality in a system, whether achieved =
in
> the IGP/measurement/some-other module, is an implementation specific aspe=
ct.
>
>
>
> To answer your question, these aspects may be implemented outside the cor=
e
> IGP module and the IGPs simply flood these while satisfying the aspects
> specified in the document.
>
>
>
> Thanks,
>
> Ketan
>
>
>
> *From:* Lsr <lsr-bounces@ietf.org> *On Behalf Of *Muthu Arul Mozhi Peruma=
l
> *Sent:* 05 June 2018 16:42
> *To:* Stefano Previdi (IETF) <s@previdi.net>
> *Cc:* lsr@ietf.org; Jeff Tantsura <jefftant.ietf@gmail.com>
> *Subject:* Re: [Lsr] IGP TE Metric Extensions
>
>
>
>
>
> =E2=80=8BPlease see inline..=E2=80=8B
>
>
>
> On Fri, Jun 1, 2018 at 2:34 AM, Stefano Previdi (IETF) <s@previdi.net>
> wrote:
>
>
>
> On Thu, May 31, 2018, 6:15 PM Muthu Arul Mozhi Perumal <
> muthu.arul@gmail.com> wrote:
>
> Thanks, Jeff. Would be good to have this clarified in
>
> =E2=80=8B=E2=80=8B
>
> draft-ginsberg-isis-rfc7810bis. My original message seems to have been
> stripped off, so including it again for the lsr list..
>
>
>
> =E2=80=8BBoth RFC 7810 and RFC 7471 say that:
>
>
>
>    The measurement interval, any filter coefficients, and any
>
>    advertisement intervals MUST be configurable per sub-TLV.
>
>
>
>    Additionally, the default measurement interval for all sub-TLVs
>
>    SHOULD be 30 seconds.
>
>
>
> However, both RFCs initially say that they only describe mechanisms for
> disseminating performance information and methods of measurements is
> outside their scope.
>
>
>
> Moreover, for a first time reader, it seems to suggest that the
> measurement interval and filter coefficient must be supported and
> configurable under the IGP.
>
>
>
>
>
> No. This is not suggested in any form.
>
> It is clearly indicated that the draft does not deal with measurements
> which means no recommendation is made.
>
>
>
>
>
> In a system supporting multiple IGPs, I would expect that they be
> implemented outside the IGP and the IGPs just disseminate the information
> provided to them.
>
>
>
> Thoughts, especially from an implementation standpoint?
>
>
>
>
>
> Again, the draft is only about dissemination, not measurements..
>
>
>
> =E2=80=8BHow is the measurement interval and filter coefficients describe=
d in the
> draft related to dissemination?=E2=80=8B
>
>
>
> =E2=80=8B   The measurement interval, any filter coefficients, and any
>
>    advertisement intervals MUST be configurable per sub-TLV.
>
>
>
>    Additionally, the default measurement interval for all sub-TLVs
>
>    SHOULD be 30 seconds.=E2=80=8B
>
>
>
> If your question is related to configuration and implementation of
> measurements, well it will not be addressed by this draft.
>
>
>
> We intentionally left out this part that does not belong to the igp
> protocol machinery.
>
>
>
> =E2=80=8BWhich of the functionalities described in sections 5, 6, 7 of th=
e draft
> belong to the IGP protocol machinery?
>
>
>
> Regards,
>
> Muthu
>
>
>
>
>
> s.
>
>
>
>
>
>
>
> Regards.
>
> Muthu
>
>
>
> On Thu, May 31, 2018 at 11:37 AM, Jeff Tantsura <jefftant.ietf@gmail.com>
> wrote:
>
> Muthu,
>
> LSR would be a more suitable list to post to, CCed.
>
> Regards,
> Jeff
>
> > On May 30, 2018, at 18:06, Muthu Arul Mozhi Perumal <
> muthu.arul@gmail.com> wrote:
> >
> > Muthu
>
>
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>
>
>
>
>

--0000000000004d112c056de418d1
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default"><font face=3D"arial, helvetic=
a, sans-serif">If these are only implementation specific aspects and should=
n&#39;t get into the draft, what is the point of sections 5,6,7? Why would =
it hurt to say what is generally expected to be part of the protocol machin=
ery and what is not?</font></div><div class=3D"gmail_default"><font face=3D=
"arial, helvetica, sans-serif"><br></font></div><div class=3D"gmail_default=
"><font face=3D"arial, helvetica, sans-serif">BTW, any known implementation=
=C2=A0for RFC 7810, also supporting sections 5,6,7?</font><br></div><div cl=
ass=3D"gmail_default"><font face=3D"arial, helvetica, sans-serif"><br></fon=
t></div><div class=3D"gmail_default"><font face=3D"arial, helvetica, sans-s=
erif">Regards,</font></div><div class=3D"gmail_default"><font face=3D"arial=
, helvetica, sans-serif">Muthu</font></div><div class=3D"gmail_extra"><br><=
div class=3D"gmail_quote">On Tue, Jun 5, 2018 at 5:33 PM, Ketan Talaulikar =
(ketant) <span dir=3D"ltr">&lt;<a href=3D"mailto:ketant@cisco.com" target=
=3D"_blank">ketant@cisco.com</a>&gt;</span> wrote:<br><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">





<div lang=3D"EN-US">
<div class=3D"gmail-m_-4066922875476902738WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif;color:rgb(31,73,125)">Hi Muthu,<u></u><u></u></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" 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-IN" style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif;color:rgb(31,73,125)">These are implementation spec=
ific aspects and I am not sure if this is something that the draft should b=
e getting into.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" 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-IN" 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-IN" style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif;color:rgb(31,73,125)">Ketan<u></u><u></u></span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" 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"><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"> Muthu Arul Mozhi Perumal &lt;<a href=3D"mailto:muthu.arul@=
gmail.com" target=3D"_blank">muthu.arul@gmail.com</a>&gt;
<br>
<b>Sent:</b> 05 June 2018 17:19<br>
<b>To:</b> Ketan Talaulikar (ketant) &lt;<a href=3D"mailto:ketant@cisco.com=
" target=3D"_blank">ketant@cisco.com</a>&gt;<br>
<b>Cc:</b> Stefano Previdi (IETF) &lt;<a href=3D"mailto:s@previdi.net" targ=
et=3D"_blank">s@previdi.net</a>&gt;; <a href=3D"mailto:lsr@ietf.org" target=
=3D"_blank">lsr@ietf.org</a>; Jeff Tantsura &lt;<a href=3D"mailto:jefftant.=
ietf@gmail.com" target=3D"_blank">jefftant.ietf@gmail.com</a>&gt;</span></p=
><div><div class=3D"gmail-h5"><br>
<b>Subject:</b> Re: [Lsr] IGP TE Metric Extensions<u></u><u></u></div></div=
><p></p><div><div class=3D"gmail-h5">
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">Sounds =
reasonable to me..<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif"><u></u>=
=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">Adding =
a clarification note in the draft would be useful, IMHO.<u></u><u></u></spa=
n></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif"><u></u>=
=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">Regards=
,<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">Muthu<u=
></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<p class=3D"MsoNormal">On Tue, Jun 5, 2018 at 5:00 PM, Ketan Talaulikar (ke=
tant) &lt;<a href=3D"mailto:ketant@cisco.com" target=3D"_blank">ketant@cisc=
o.com</a>&gt; wrote:<u></u><u></u></p>
<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"><span lang=3D"EN-IN" style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif;color:rgb(31,73,125)">Hi Muthu,</span><u></u><u></u=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif;color:rgb(31,73,125)">=C2=A0</span><u></u><u></u></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif;color:rgb(31,73,125)">The Sections 5, 6 and 7 of th=
ese drafts are critical as it impacts the IGP protocol operation
 and stability though it is not an integral part of the IGP protocol machin=
ery. This functionality in a system, whether achieved in the IGP/measuremen=
t/some-other module, is an implementation specific aspect.</span><u></u><u>=
</u></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif;color:rgb(31,73,125)">=C2=A0</span><u></u><u></u></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif;color:rgb(31,73,125)">To answer your question, thes=
e aspects may be implemented outside the core IGP module
 and the IGPs simply flood these while satisfying the aspects specified in =
the document.</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif;color:rgb(31,73,125)">=C2=A0</span><u></u><u></u></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif;color:rgb(31,73,125)">Thanks,</span><u></u><u></u><=
/p>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif;color:rgb(31,73,125)">Ketan</span><u></u><u></u></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-IN" style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif;color:rgb(31,73,125)">=C2=A0</span><u></u><u></u></=
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"> Lsr &lt;<a href=3D"mailto:lsr-bounces@ietf.org" target=3D"=
_blank">lsr-bounces@ietf.org</a>&gt;
<b>On Behalf Of </b>Muthu Arul Mozhi Perumal<br>
<b>Sent:</b> 05 June 2018 16:42<br>
<b>To:</b> Stefano Previdi (IETF) &lt;<a href=3D"mailto:s@previdi.net" targ=
et=3D"_blank">s@previdi.net</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@ietf.org</=
a>; Jeff Tantsura &lt;<a href=3D"mailto:jefftant.ietf@gmail.com" target=3D"=
_blank">jefftant.ietf@gmail.com</a>&gt;<br>
<b>Subject:</b> Re: [Lsr] IGP TE Metric Extensions</span><u></u><u></u></p>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">=C2=A0<=
/span><u></u><u></u></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">=E2=80=
=8BPlease see inline..=E2=80=8B</span><u></u><u></u></p>
</div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">On Fri, Jun 1, 2018 at 2:34 AM, Stefano Previdi (IET=
F) &lt;<a href=3D"mailto:s@previdi.net" target=3D"_blank">s@previdi.net</a>=
&gt; wrote:<u></u><u></u></p>
<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-bottom:12pt">=C2=A0<u></u><u></u></p=
>
<div>
<div>
<p class=3D"MsoNormal">On Thu, May 31, 2018, 6:15 PM Muthu Arul Mozhi Perum=
al &lt;<a href=3D"mailto:muthu.arul@gmail.com" target=3D"_blank">muthu.arul=
@gmail.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"><span style=3D"font-family:Arial,sans-serif">Thanks,=
 Jeff. Would be good to have this clarified in=C2=A0</span><u></u><u></u></=
p>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">=E2=80=
=8B=E2=80=8B</span><u></u><u></u></p>
</div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">draft-g=
insberg-isis-<wbr>rfc7810bis. My original message seems to have been stripp=
ed off, so including it again for the lsr list..</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">=C2=A0<=
/span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">=E2=80=
=8BBoth RFC 7810 and RFC 7471 say that:</span><u></u><u></u></p>
</div>
<div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">=C2=A0 =
=C2=A0The measurement interval, any filter coefficients, and any</span><u><=
/u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">=C2=A0 =
=C2=A0advertisement intervals MUST be configurable per sub-TLV.</span><u></=
u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">=C2=A0 =
=C2=A0Additionally, the default measurement interval for all sub-TLVs</span=
><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">=C2=A0 =
=C2=A0SHOULD be 30 seconds.</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">However=
, both RFCs initially say that they only describe mechanisms for disseminat=
ing performance information and methods of measurements
 is outside their scope.</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">Moreove=
r, for a first time reader, it seems to suggest that the measurement interv=
al and filter coefficient must be supported and configurable
 under the IGP.</span><u></u><u></u></p>
</div>
</div>
</div>
</blockquote>
</div>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">No. This is not suggested in any form.<u></u><u></u>=
</p>
</div>
<div>
<p class=3D"MsoNormal">It is clearly indicated that the draft does not deal=
 with measurements which means no recommendation is made.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<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>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">In a sy=
stem supporting multiple IGPs, I would expect that they be implemented outs=
ide the IGP and the IGPs just disseminate the information
 provided to them.</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">Thought=
s, especially from an implementation standpoint?</span><u></u><u></u></p>
</div>
</div>
</div>
</blockquote>
</div>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Again, the draft is only about dissemination, not me=
asurements..
<u></u><u></u></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">=E2=80=
=8BHow is the measurement interval and filter coefficients described in the=
 draft related to dissemination?=E2=80=8B</span><u></u><u></u></p>
</div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">=E2=80=
=8B=C2=A0 =C2=A0The measurement interval, any filter coefficients, and any<=
/span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">=C2=A0 =
=C2=A0advertisement intervals MUST be configurable per sub-TLV.</span><u></=
u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">=C2=A0 =
=C2=A0Additionally, the default measurement interval for all sub-TLVs</span=
><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">=C2=A0 =
=C2=A0SHOULD be 30 seconds.=E2=80=8B</span><u></u><u></u></p>
</div>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<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">If your question is related to configuration and imp=
lementation of measurements, well it will not be addressed by this draft.<u=
></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">We intentionally left out this part that does not be=
long to the igp protocol machinery.<u></u><u></u></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">=E2=80=
=8BWhich of the functionalities described in sections 5, 6, 7 of the draft =
belong to the IGP protocol machinery?</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">=C2=A0<=
/span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">Regards=
,</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">Muthu</=
span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">=C2=A0<=
/span><u></u><u></u></p>
</div>
</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">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">s.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<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>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">Regards=
.</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">Muthu</=
span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:Arial,sans-serif">=C2=A0<=
/span><u></u><u></u></p>
</div>
<div>
<div>
<p class=3D"MsoNormal">On Thu, May 31, 2018 at 11:37 AM, Jeff Tantsura &lt;=
<a href=3D"mailto:jefftant.ietf@gmail.com" target=3D"_blank">jefftant.ietf@=
gmail.com</a>&gt; wrote:<u></u><u></u></p>
<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">
<p class=3D"MsoNormal">Muthu,<br>
<br>
LSR would be a more suitable list to post to, CCed.<br>
<br>
Regards,<br>
Jeff<br>
<br>
&gt; On May 30, 2018, at 18:06, Muthu Arul Mozhi Perumal &lt;<a href=3D"mai=
lto:muthu.arul@gmail.com" target=3D"_blank">muthu.arul@gmail.com</a>&gt; wr=
ote:<br>
&gt; <br>
&gt; Muthu<u></u><u></u></p>
</blockquote>
</div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal">______________________________<wbr>_________________=
<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/<wbr>listinfo/lsr</a><u></u><u></u></p>
</blockquote>
</div>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
</div>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</div>
</div></div></div>
</div>

</blockquote></div><br></div></div>

--0000000000004d112c056de418d1--


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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
CC: "Stefano Previdi (IETF)" <s@previdi.net>, "lsr@ietf.org" <lsr@ietf.org>, Jeff Tantsura <jefftant.ietf@gmail.com>
Thread-Topic: [Lsr] IGP TE Metric Extensions
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Date: Tue, 5 Jun 2018 12:41:07 +0000
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Subject: Re: [Lsr] IGP TE Metric Extensions
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--_000_22e72ae080d64b698f00b4be2d2362eeXCHALN008ciscocom_--


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To: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
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Subject: Re: [Lsr] IGP TE Metric Extensions
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> On Jun 5, 2018, at 2:21 PM, Muthu Arul Mozhi Perumal =
<muthu.arul@gmail.com> wrote:
>=20
> If these are only implementation specific aspects and shouldn't get =
into the draft, what is the point of sections 5,6,7?


these sections describe the requirements implementations must address. =
The way they address them is out of scope of the document.

s.



> Why would it hurt to say what is generally expected to be part of the =
protocol machinery and what is not?

>=20
> BTW, any known implementation for RFC 7810, also supporting sections =
5,6,7?
>=20
> Regards,
> Muthu
>=20
> On Tue, Jun 5, 2018 at 5:33 PM, Ketan Talaulikar (ketant) =
<ketant@cisco.com> wrote:
> Hi Muthu,
>=20
> =20
>=20
> These are implementation specific aspects and I am not sure if this is =
something that the draft should be getting into.
>=20
> =20
>=20
> Thanks,
>=20
> Ketan
>=20
> =20
>=20
> From: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>=20
> Sent: 05 June 2018 17:19
> To: Ketan Talaulikar (ketant) <ketant@cisco.com>
> Cc: Stefano Previdi (IETF) <s@previdi.net>; lsr@ietf.org; Jeff =
Tantsura <jefftant.ietf@gmail.com>
>=20
>=20
> Subject: Re: [Lsr] IGP TE Metric Extensions
>=20
> =20
>=20
> Sounds reasonable to me..
>=20
> =20
>=20
> Adding a clarification note in the draft would be useful, IMHO.
>=20
> =20
>=20
> Regards,
>=20
> Muthu
>=20
> =20
>=20
> On Tue, Jun 5, 2018 at 5:00 PM, Ketan Talaulikar (ketant) =
<ketant@cisco.com> wrote:
>=20
> Hi Muthu,
>=20
> =20
>=20
> The Sections 5, 6 and 7 of these drafts are critical as it impacts the =
IGP protocol operation and stability though it is not an integral part =
of the IGP protocol machinery. This functionality in a system, whether =
achieved in the IGP/measurement/some-other module, is an implementation =
specific aspect.
>=20
> =20
>=20
> To answer your question, these aspects may be implemented outside the =
core IGP module and the IGPs simply flood these while satisfying the =
aspects specified in the document.
>=20
> =20
>=20
> Thanks,
>=20
> Ketan
>=20
> =20
>=20
> From: Lsr <lsr-bounces@ietf.org> On Behalf Of Muthu Arul Mozhi Perumal
> Sent: 05 June 2018 16:42
> To: Stefano Previdi (IETF) <s@previdi.net>
> Cc: lsr@ietf.org; Jeff Tantsura <jefftant.ietf@gmail.com>
> Subject: Re: [Lsr] IGP TE Metric Extensions
>=20
> =20
>=20
> =20
>=20
> =E2=80=8BPlease see inline..=E2=80=8B
>=20
> =20
>=20
> On Fri, Jun 1, 2018 at 2:34 AM, Stefano Previdi (IETF) <s@previdi.net> =
wrote:
>=20
> =20
>=20
> On Thu, May 31, 2018, 6:15 PM Muthu Arul Mozhi Perumal =
<muthu.arul@gmail.com> wrote:
>=20
> Thanks, Jeff. Would be good to have this clarified in=20
>=20
> =E2=80=8B=E2=80=8B
>=20
> draft-ginsberg-isis-rfc7810bis. My original message seems to have been =
stripped off, so including it again for the lsr list..
>=20
> =20
>=20
> =E2=80=8BBoth RFC 7810 and RFC 7471 say that:
>=20
> =20
>=20
>    The measurement interval, any filter coefficients, and any
>=20
>    advertisement intervals MUST be configurable per sub-TLV.
>=20
> =20
>=20
>    Additionally, the default measurement interval for all sub-TLVs
>=20
>    SHOULD be 30 seconds.
>=20
> =20
>=20
> However, both RFCs initially say that they only describe mechanisms =
for disseminating performance information and methods of measurements is =
outside their scope.
>=20
> =20
>=20
> Moreover, for a first time reader, it seems to suggest that the =
measurement interval and filter coefficient must be supported and =
configurable under the IGP.
>=20
> =20
>=20
> =20
>=20
> No. This is not suggested in any form.
>=20
> It is clearly indicated that the draft does not deal with measurements =
which means no recommendation is made.
>=20
> =20
>=20
> =20
>=20
> In a system supporting multiple IGPs, I would expect that they be =
implemented outside the IGP and the IGPs just disseminate the =
information provided to them.
>=20
> =20
>=20
> Thoughts, especially from an implementation standpoint?
>=20
> =20
>=20
> =20
>=20
> Again, the draft is only about dissemination, not measurements..
>=20
> =20
>=20
> =E2=80=8BHow is the measurement interval and filter coefficients =
described in the draft related to dissemination?=E2=80=8B
>=20
> =20
>=20
> =E2=80=8B   The measurement interval, any filter coefficients, and any
>=20
>    advertisement intervals MUST be configurable per sub-TLV.
>=20
> =20
>=20
>    Additionally, the default measurement interval for all sub-TLVs
>=20
>    SHOULD be 30 seconds.=E2=80=8B
>=20
> =20
>=20
> If your question is related to configuration and implementation of =
measurements, well it will not be addressed by this draft.
>=20
> =20
>=20
> We intentionally left out this part that does not belong to the igp =
protocol machinery.
>=20
> =20
>=20
> =E2=80=8BWhich of the functionalities described in sections 5, 6, 7 of =
the draft belong to the IGP protocol machinery?
>=20
> =20
>=20
> Regards,
>=20
> Muthu
>=20
> =20
>=20
> =20
>=20
> s.
>=20
> =20
>=20
> =20
>=20
> =20
>=20
> Regards.
>=20
> Muthu
>=20
> =20
>=20
> On Thu, May 31, 2018 at 11:37 AM, Jeff Tantsura =
<jefftant.ietf@gmail.com> wrote:
>=20
> Muthu,
>=20
> LSR would be a more suitable list to post to, CCed.
>=20
> Regards,
> Jeff
>=20
> > On May 30, 2018, at 18:06, Muthu Arul Mozhi Perumal =
<muthu.arul@gmail.com> wrote:
> >=20
> > Muthu
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To: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
Cc: "Stefano Previdi (IETF)" <s@previdi.net>, lsr@ietf.org, Jeff Tantsura <jefftant.ietf@gmail.com>
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Subject: Re: [Lsr] IGP TE Metric Extensions
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--0000000000003419d9056de72035
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=E2=80=8BMuthu,=E2=80=8B


> =E2=80=8BHow is the measurement interval and filter coefficients describe=
d in the
> draft related to dissemination?=E2=80=8B
>

=E2=80=8BIt is directly related. If you see the title of the section is:
"Announcement Thresholds and Filters"=E2=80=8B

So measurement interval does not intend to describe how often you actually
measure ... it describes a time window where you report the value (which
could consist of many measurements actually taken).

We intentionally left out this part that does not belong to the igp
>> protocol machinery.
>>
>
> =E2=80=8BWhich of the functionalities described in sections 5, 6, 7 of th=
e draft
> belong to the IGP protocol machinery?
>


=E2=80=8BWhat draft are you talking about ? I was under impression that we =
are
discussing RFCs here.

=E2=80=8BAll functionality from sections 5-7 aim to provide machinery to co=
ntrol
stability of protocol operation. It is one how you measure and this is not
part of the RFCs. and completely different what and how you advertised
derived values from those gathered by your measurements. Now keeping in
mind that you do not advertise when you measure but only when you are
allowed by protocol rules it should be easy to see the point which Stefano
made above.

=E2=80=8BThx,
R.

--0000000000003419d9056de72035
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Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote"><div=
><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-ser=
if;font-size:small">=E2=80=8BMuthu,=E2=80=8B</div></div><div>=C2=A0</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 dir=3D"ltr"><div class=
=3D"gmail_extra"><div class=3D"gmail_quote"><div><span style=3D"font-family=
:arial,helvetica,sans-serif">=E2=80=8BHow is the measurement interval and f=
ilter coefficients described in the draft related to dissemination?=E2=80=
=8B</span></div></div></div></div></blockquote><div><br></div><div><div cla=
ss=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;font-s=
ize:small">=E2=80=8BIt is directly related. If you see the title of the sec=
tion is: &quot;Announcement Thresholds and Filters&quot;=E2=80=8B</div><div=
 class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;fo=
nt-size:small"><br></div><div class=3D"gmail_default" style=3D"font-family:=
arial,helvetica,sans-serif;font-size:small">So measurement interval does no=
t intend to describe how often you actually measure ... it describes a time=
 window where you report the value (which could consist of many measurement=
s actually taken).=C2=A0</div><br></div><blockquote class=3D"gmail_quote" s=
tyle=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);pad=
ding-left:1ex"><div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gm=
ail_quote"><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"au=
to"><span class=3D"gmail-"><div dir=3D"auto">We intentionally left out this=
 part that does not belong to the igp protocol machinery.<br></div></span><=
/div></blockquote><div><br></div><div><div style=3D"font-family:arial,helve=
tica,sans-serif;font-size:small">=E2=80=8BWhich of the functionalities desc=
ribed in sections 5, 6, 7 of the draft belong to the IGP protocol machinery=
?</div></div></div></div></div></blockquote><div><br></div><div><br></div><=
div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-=
serif;font-size:small">=E2=80=8BWhat draft are you talking about ? I was un=
der impression that we are discussing RFCs here.=C2=A0</div><div class=3D"g=
mail_default" style=3D"font-family:arial,helvetica,sans-serif;font-size:sma=
ll"><br></div><div class=3D"gmail_default" style=3D"font-family:arial,helve=
tica,sans-serif;font-size:small">=E2=80=8BAll functionality from sections 5=
-7 aim to provide machinery to control stability of protocol operation. It =
is one how you measure and this is not part of the RFCs. and completely dif=
ferent what and how you advertised derived values from those gathered by yo=
ur measurements. Now keeping in mind that you do not advertise when you mea=
sure but only when you are allowed by protocol rules it should be easy to s=
ee the point which Stefano made above.=C2=A0</div><br></div><div><div class=
=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;font-siz=
e:small">=E2=80=8BThx,</div></div><div class=3D"gmail_default" style=3D"fon=
t-family:arial,helvetica,sans-serif;font-size:small">R.</div><div class=3D"=
gmail_default" style=3D"font-family:arial,helvetica,sans-serif;font-size:sm=
all"><br></div></div></div></div>

--0000000000003419d9056de72035--


From nobody Tue Jun  5 11:08:01 2018
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From: "Sabrina Tanamal via RT" <iana-prot-param@iana.org>
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References: <RT-Ticket-1112484@icann.org> <RT-Ticket-1109980@icann.org> <0B952820-E870-4A95-A323-C24D4D393DE9@cisco.com> <6F992B24-F2C5-48EB-AFA0-9E0039E3FAF9@cisco.com> <rt-4.2.9-22380-1528152716-92.1109980-7-0@icann.org> <824e9f172e0e4d73bc4545b5889ce35b@XCH-ALN-001.cisco.com>
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CC: ginsberg@cisco.com, acee@cisco.com, draft-ietf-isis-segment-routing-extensions@ietf.org, lsr@ietf.org, chopps@chopps.org, uma.chunduri@huawei.com
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Subject: [Lsr] [IANA #1112484] RE: Early Allocation Extension for "IS-IS Extensions for Segment Routing" - draft-ietf-isis-segment-routing-extensions-16.txt
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Hi Les,

The expiration date is set to expire one year from the date of allocation. Since we made the registrations yesterday, the expiration date is different from the others. If the document hasn't been approved for publication before the expiration date, we'll contact you to ask whether you need a one-year extension. 

Thanks,
Sabrina

On Mon Jun 04 23:02:29 2018, ginsberg@cisco.com wrote:
> Sabrina -
> 
> Thanx for completing this.
> 
> Any reason why the last two codepoints
> 
> > 22    Segment Routing Local Block (SRLB) (TEMPORARY - registered
> > 2018-
> > 06-04, expires 2019-06-04)    [draft-ietf-isis-segment-routing-
> > extensions]
> >
> > 24    Segment Routing Mapping Server Preference (SRMS Preference)
> > (TEMPORARY - registered 2018-06-04, expires 2019-06-04)       [draft-
> > ietf-
> > isis-segment-routing-extensions]
> 
> expire on a different date from the others?
> I hope this won’t matter as we have passed WG Last Call - but just in
> case...???
> 
> Les
> 
> > -----Original Message-----
> > From: Sabrina Tanamal via RT <iana-prot-param@iana.org>
> > Sent: Monday, June 04, 2018 3:52 PM
> > Cc: lsr@ietf.org; Les Ginsberg (ginsberg) <ginsberg@cisco.com>;
> > draft-ietf-
> > isis-segment-routing-extensions@ietf.org; chopps@chopps.org;
> > uma.chunduri@huawei.com; Acee Lindem (acee) <acee@cisco.com>
> > Subject: [IANA #1109980] Early Allocation Extension for "IS-IS
> > Extensions for
> > Segment Routing" - draft-ietf-isis-segment-routing-extensions-16.txt
> >
> > Hi all,
> >
> > We've updated the expiration date for the following registrations:
> >
> > In the TLV Codepoints Registry:
> >
> > 149   Segment Identifier / Label Binding (TEMPORARY - registered
> > 2016-06-
> > 29, extension registered 2018-06-04, expires 2019-06-29)      n
> > y
> >       n       n       [draft-ietf-isis-segment-routing-extensions]
> >
> > 150   Multi-Topology Segment Identifier / Label Binding (TEMPORARY -
> > registered 2016-06-29, extension registered 2018-06-04, expires 2019-
> > 06-29)
> >       n       y       n       n       [draft-ietf-isis-segment-
> > routing-
> > extensions]
> >
> > In the Sub-TLVs for TLVs 22, 23, 25, 141, 222, and 223 registry:
> >
> > 31    Adjacency Segment Identifier (TEMPORARY - registered 2016-06-
> > 29,
> > extension registered 2018-06-04, expires 2019-06-29)  y       y
> > n
> >       y       y       y       [draft-ietf-isis-segment-routing-
> > extensions]
> >
> > 32    LAN Adjacency Segment Identifier (TEMPORARY - registered 2016-
> > 06-29, extension registered 2018-06-04, expires 2019-06-29)   y
> > y
> >       n       y       y       y       [draft-ietf-isis-segment-
> > routing-
> > extensions]
> >
> > In the Sub-TLVs for TLVs 135, 235, 236, and 237 registry:
> >
> > 3     Prefix Segment Identifier (TEMPORARY - registered 2016-06-29,
> > extension registered 2018-06-04, expires 2019-06-29)  y       y
> > y
> >       y       [draft-ietf-isis-segment-routing-extensions]
> >
> > In the Sub-TLVs for TLV 242 registry:
> >
> > 2     Segment Routing Capability (TEMPORARY - registered 2016-06-29,
> > extension registered 2018-06-04, expires 2019-06-29)  [draft-ietf-
> > isis-
> > segment-routing-extensions]
> >
> > 19    Segment Routing Algorithm (TEMPORARY - registered 2016-06-29,
> > extension registered 2018-06-04, expires 2019-06-29)  [draft-ietf-
> > isis-
> > segment-routing-extensions]
> >
> > We've made the following early allocations:
> >
> > 22    Segment Routing Local Block (SRLB) (TEMPORARY - registered
> > 2018-
> > 06-04, expires 2019-06-04)    [draft-ietf-isis-segment-routing-
> > extensions]
> >
> > 24    Segment Routing Mapping Server Preference (SRMS Preference)
> > (TEMPORARY - registered 2018-06-04, expires 2019-06-04)       [draft-
> > ietf-
> > isis-segment-routing-extensions]
> >
> > Please see
> > https://www.iana.org/assignments/isis-tlv-codepoints
> >
> > Best regards,
> >
> > Sabrina Tanamal
> > Senior IANA Services Specialist
> >
> > On Tue May 15 17:12:25 2018, acee@cisco.com wrote:
> > > Hi Amanda, et al,
> > >
> > > I just communicated with Les, one of the designated experts for the
> > > IS-IS TLV 242 registry, and the draft requires two additional Sub-
> > > TLV
> > > allocations:
> > >
> > > Sub-TLV 22 for Segment Routing Local Block (SRLB) Sub-TLV 24 for
> > > Segment Routing Mapping Server (SRMS) Preference
> > >
> > > Thanks,
> > > Acee
> > >
> > > From: Acee Lindem <acee@cisco.com>
> > > Date: Tuesday, May 15, 2018 at 10:54 AM
> > > To: IANA <iana@iana.org>, Alvaro Retana <aretana.ietf@gmail.com>
> > > Cc: Christian Hopps <chopps@chopps.org>, "lsr@ietf.org"
> > > <lsr@ietf.org>, "draft-ietf-isis-segment-routing-
> > > extensions@ietf.org"
> > > <draft-ietf-isis-segment-routing-extensions@ietf.org>, Uma Chunduri
> > > <uma.chunduri@huawei.com>
> > > Subject: Early Allocation Extension for "IS-IS Extensions for
> > > Segment
> > > Routing" - draft-ietf-isis-segment-routing-extensions-16.txt
> > >
> > > Hi Amanda, et al IANA, Alvaro,
> > >
> > > For a variety of reasons, we will not finish the subject draft by
> > > the
> > > end of June when the IANA allocations expire. It has just completed
> > > WG
> > > last call but there are many fastidious reviewers are in the path
> > > to
> > > completion. Please extend the allocations and add any that were not
> > > in
> > > the original early allocations. For example, we need the SRMS
> > > Preference allocated in the TLV 242 registry ASAP since we have
> > > early
> > > allocations to make in this registry.
> > >
> > > Thanks,
> > > Acee
> >
> >
> 




From nobody Tue Jun  5 18:26:10 2018
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From: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
Date: Wed, 6 Jun 2018 06:56:04 +0530
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To: Robert Raszuk <robert@raszuk.net>
Cc: "Stefano Previdi (IETF)" <s@previdi.net>, lsr@ietf.org, Jeff Tantsura <jefftant.ietf@gmail.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/nPmr1-WnjbFjvjbQIgxTZMFFwZQ>
Subject: Re: [Lsr] IGP TE Metric Extensions
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Robert,

On Tue, Jun 5, 2018 at 9:28 PM, Robert Raszuk <robert@raszuk.net> wrote:

> =E2=80=8BMuthu,=E2=80=8B
>
>
>> =E2=80=8BHow is the measurement interval and filter coefficients describ=
ed in the
>> draft related to dissemination?=E2=80=8B
>>
>
> =E2=80=8BIt is directly related. If you see the title of the section is:
> "Announcement Thresholds and Filters"=E2=80=8B
>
> So measurement interval does not intend to describe how often you actuall=
y
> measure ... it describes a time window where you report the value (which
> could consist of many measurements actually taken).
>

=E2=80=8BAre you saying measurement interval is a misnomer? The draft clear=
ly
distinguishes measurement interval from announcement interval:

=E2=80=8B   Additionally, the default measurement interval for all sub-TLVs
   SHOULD be 30 seconds.

   Announcements MUST also be able to be throttled using configurable
   inter-update throttle timers.  The minimum announcement periodicity
   is 1 announcement per second.  The default value SHOULD be set to 120
   seconds.=E2=80=8B

Yet, it claims measurements are outside its scope..


> We intentionally left out this part that does not belong to the igp
>>> protocol machinery.
>>>
>>
>> =E2=80=8BWhich of the functionalities described in sections 5, 6, 7 of t=
he draft
>> belong to the IGP protocol machinery?
>>
>
>
> =E2=80=8BWhat draft are you talking about ? I was under impression that w=
e are
> discussing RFCs here.
>

=E2=80=8BWell, both -:) I am referring to draft-ginsberg-lsr-isis-rfc7810bi=
s and I
believe there is a chance to improve some text in RFC7810..

Regards,
Muthu


>
>
> =E2=80=8BAll functionality from sections 5-7 aim to provide machinery to =
control
> stability of protocol operation. It is one how you measure and this is no=
t
> part of the RFCs. and completely different what and how you advertised
> derived values from those gathered by your measurements. Now keeping in
> mind that you do not advertise when you measure but only when you are
> allowed by protocol rules it should be easy to see the point which Stefan=
o
> made above.
>
> =E2=80=8BThx,
> R.
>
>

--000000000000f6ff27056def0cac
Content-Type: text/html; charset="UTF-8"
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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif;font-size:small">Robert,</div><div class=3D"gmail_defaul=
t" style=3D"font-family:arial,helvetica,sans-serif;font-size:small"><br></d=
iv><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-s=
erif;font-size:small"><span style=3D"font-family:arial,sans-serif">On Tue, =
Jun 5, 2018 at 9:28 PM, Robert Raszuk </span><span dir=3D"ltr" style=3D"fon=
t-family:arial,sans-serif">&lt;<a href=3D"mailto:robert@raszuk.net" target=
=3D"_blank">robert@raszuk.net</a>&gt;</span><span style=3D"font-family:aria=
l,sans-serif"> wrote:</span><br></div><div class=3D"gmail_extra"><div class=
=3D"gmail_quote"><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"><div class=3D"gmail_extra"><div class=3D"gmail_quote"><div><div st=
yle=3D"font-family:arial,helvetica,sans-serif;font-size:small">=E2=80=8BMut=
hu,=E2=80=8B</div></div><span class=3D"gmail-"><div>=C2=A0</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"><div class=3D"gmail=
_extra"><div class=3D"gmail_quote"><div><span style=3D"font-family:arial,he=
lvetica,sans-serif">=E2=80=8BHow is the measurement interval and filter coe=
fficients described in the draft related to dissemination?=E2=80=8B</span><=
/div></div></div></div></blockquote><div><br></div></span><div><div style=
=3D"font-family:arial,helvetica,sans-serif;font-size:small">=E2=80=8BIt is =
directly related. If you see the title of the section is: &quot;Announcemen=
t Thresholds and Filters&quot;=E2=80=8B</div><div style=3D"font-family:aria=
l,helvetica,sans-serif;font-size:small"><br></div><div style=3D"font-family=
:arial,helvetica,sans-serif;font-size:small">So measurement interval does n=
ot intend to describe how often you actually measure ... it describes a tim=
e window where you report the value (which could consist of many measuremen=
ts actually taken).</div></div></div></div></div></blockquote><div><br></di=
v><div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sa=
ns-serif;font-size:small">=E2=80=8BAre you saying measurement interval is a=
 misnomer? The draft clearly distinguishes measurement interval from announ=
cement interval:</div><br></div><div><div class=3D"gmail_default"><span sty=
le=3D"font-family:arial,helvetica,sans-serif;font-size:small">=E2=80=8B</sp=
an><font face=3D"arial, helvetica, sans-serif">=C2=A0 =C2=A0Additionally, t=
he default measurement interval for all sub-TLVs</font></div><div class=3D"=
gmail_default"><font face=3D"arial, helvetica, sans-serif">=C2=A0 =C2=A0SHO=
ULD be 30 seconds.</font></div><div class=3D"gmail_default"><font face=3D"a=
rial, helvetica, sans-serif"><br></font></div><div class=3D"gmail_default">=
<font face=3D"arial, helvetica, sans-serif">=C2=A0 =C2=A0Announcements MUST=
 also be able to be throttled using configurable</font></div><div class=3D"=
gmail_default"><font face=3D"arial, helvetica, sans-serif">=C2=A0 =C2=A0int=
er-update throttle timers.=C2=A0 The minimum announcement periodicity</font=
></div><div class=3D"gmail_default"><font face=3D"arial, helvetica, sans-se=
rif">=C2=A0 =C2=A0is 1 announcement per second.=C2=A0 The default value SHO=
ULD be set to 120</font></div><div class=3D"gmail_default"><font face=3D"ar=
ial, helvetica, sans-serif">=C2=A0 =C2=A0seconds.</font><span style=3D"font=
-family:arial,helvetica,sans-serif;font-size:small">=E2=80=8B</span></div><=
div class=3D"gmail_default"><br></div></div><div class=3D"gmail_default">Ye=
t, it claims measurements are outside its scope..</div><div class=3D"gmail_=
default"><br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0p=
x 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div d=
ir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote"><div><br><=
/div><span class=3D"gmail-"><blockquote class=3D"gmail_quote" style=3D"marg=
in:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1e=
x"><div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote"><=
blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-l=
eft:1px solid rgb(204,204,204);padding-left:1ex"><div dir=3D"auto"><span cl=
ass=3D"gmail-m_-4522386361963597453gmail-"><div dir=3D"auto">We intentional=
ly left out this part that does not belong to the igp protocol machinery.<b=
r></div></span></div></blockquote><div><br></div><div><div style=3D"font-fa=
mily:arial,helvetica,sans-serif;font-size:small">=E2=80=8BWhich of the func=
tionalities described in sections 5, 6, 7 of the draft belong to the IGP pr=
otocol machinery?</div></div></div></div></div></blockquote><div><br></div>=
<div><br></div></span><div><div style=3D"font-family:arial,helvetica,sans-s=
erif;font-size:small">=E2=80=8BWhat draft are you talking about ? I was und=
er impression that we are discussing RFCs here.</div></div></div></div></di=
v></blockquote><div><br></div><div><div class=3D"gmail_default" style=3D"fo=
nt-family:arial,helvetica,sans-serif;font-size:small">=E2=80=8BWell, both -=
:) I am referring to=C2=A0draft-ginsberg-lsr-isis-rfc7810bis and I believe =
there is a chance to improve some text in RFC7810..</div><div class=3D"gmai=
l_default" style=3D"font-family:arial,helvetica,sans-serif;font-size:small"=
><br></div><div class=3D"gmail_default" style=3D"font-family:arial,helvetic=
a,sans-serif;font-size:small">Regards,</div><div class=3D"gmail_default" st=
yle=3D"font-family:arial,helvetica,sans-serif;font-size:small">Muthu</div><=
/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"><di=
v dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote"><div><d=
iv style=3D"font-family:arial,helvetica,sans-serif;font-size:small">=C2=A0<=
/div><div style=3D"font-family:arial,helvetica,sans-serif;font-size:small">=
<br></div><div style=3D"font-family:arial,helvetica,sans-serif;font-size:sm=
all">=E2=80=8BAll functionality from sections 5-7 aim to provide machinery =
to control stability of protocol operation. It is one how you measure and t=
his is not part of the RFCs. and completely different what and how you adve=
rtised derived values from those gathered by your measurements. Now keeping=
 in mind that you do not advertise when you measure but only when you are a=
llowed by protocol rules it should be easy to see the point which Stefano m=
ade above.=C2=A0</div><br></div><div><div style=3D"font-family:arial,helvet=
ica,sans-serif;font-size:small">=E2=80=8BThx,</div></div><div style=3D"font=
-family:arial,helvetica,sans-serif;font-size:small">R.</div><div style=3D"f=
ont-family:arial,helvetica,sans-serif;font-size:small"><br></div></div></di=
v></div>
</blockquote></div><br></div></div>

--000000000000f6ff27056def0cac--


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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>, Robert Raszuk <robert@raszuk.net>
CC: "lsr@ietf.org" <lsr@ietf.org>, Jeff Tantsura <jefftant.ietf@gmail.com>, "Stefano Previdi (IETF)" <s@previdi.net>
Thread-Topic: [Lsr] IGP TE Metric Extensions
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Date: Wed, 6 Jun 2018 05:42:51 +0000
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Subject: Re: [Lsr] IGP TE Metric Extensions
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From: Mahend Negi <mahend.ietf@gmail.com>
Date: Wed, 6 Jun 2018 11:49:48 +0530
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Subject: [Lsr] draft-ietf-isis-te-app: Clarification on Application Identifier bits
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--000000000000114963056df328ec
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Dear Authors,
I seek few clarifications on "Application Identifier bits".

As defined in the draft:

R-bit: RSVP-TE
S-bit: Segment Routing Traffic Engineering

F-bit: Loop Free Alternate
X-bit: Flex-Algo


Am I right, when I say:

R-bit: For RSVP-TE on IPv6 and IPv4 networks.

S-bit: For SR MPLS and SRv6-TE applications.


I think a bit to be allocated for SRv6-TE applications?

Not sure about RSVP-TE IPv6 case.

If you please your opinion.


Regards,

Mahendra

--000000000000114963056df328ec
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"auto"><div dir=3D"auto"><br></div><div dir=3D"auto"><div dir=3D=
"auto" style=3D"font-family:sans-serif;font-size:14px">Dear Authors,</div><=
div dir=3D"auto" style=3D"font-family:sans-serif;font-size:14px">I seek few=
 clarifications on &quot;Application Identifier bits&quot;.</div><div dir=
=3D"auto" style=3D"font-family:sans-serif;font-size:14px"><br></div><div di=
r=3D"auto" style=3D"font-family:sans-serif;font-size:14px">As defined in th=
e draft:<br></div><div dir=3D"auto" style=3D"font-family:sans-serif;font-si=
ze:14px"><br></div><div dir=3D"auto" style=3D"font-family:sans-serif;font-s=
ize:14px"><pre class=3D"m_2334948528330543984m_1126900656083700125newpage" =
style=3D"white-space:pre-wrap;font-size:18.6667px;margin-top:0px;margin-bot=
tom:0px">R-bit: RSVP-TE
S-bit: Segment Routing=C2=A0<span style=3D"font-size:18.6667px;font-family:=
sans-serif">Traffic Engineering=C2=A0</span></pre><pre class=3D"m_233494852=
8330543984m_1126900656083700125newpage" style=3D"white-space:pre-wrap;font-=
size:18.6667px;margin-top:0px;margin-bottom:0px">F-bit: Loop Free Alternate
X-bit: Flex-Algo</pre><pre class=3D"m_2334948528330543984m_1126900656083700=
125newpage" style=3D"white-space:pre-wrap;font-size:18.6667px;margin-top:0p=
x;margin-bottom:0px"><span style=3D"font-size:18.6667px"><br></span></pre><=
pre class=3D"m_2334948528330543984m_1126900656083700125newpage" style=3D"wh=
ite-space:pre-wrap;font-size:18.6667px;margin-top:0px;margin-bottom:0px"><s=
pan style=3D"font-size:18.6667px">Am I right, when I say:</span></pre><pre =
class=3D"m_2334948528330543984m_1126900656083700125newpage" style=3D"white-=
space:pre-wrap;font-size:18.6667px;margin-top:0px;margin-bottom:0px">R-bit:=
 For RSVP-TE on IPv6 <span style=3D"font-size:18.6667px">and IPv4 networks.=
</span></pre><pre class=3D"m_2334948528330543984m_1126900656083700125newpag=
e" style=3D"white-space:pre-wrap;font-size:18.6667px;margin-top:0px;margin-=
bottom:0px"><span style=3D"font-size:18.6667px">S-bit: For SR MPLS and SRv6=
-TE=C2=A0applications.</span></pre><pre class=3D"m_2334948528330543984m_112=
6900656083700125newpage" style=3D"white-space:pre-wrap;font-size:18.6667px;=
margin-top:0px;margin-bottom:0px"><span style=3D"font-size:18.6667px"><br><=
/span></pre><pre class=3D"m_2334948528330543984m_1126900656083700125newpage=
" style=3D"white-space:pre-wrap;font-size:18.6667px;margin-top:0px;margin-b=
ottom:0px">I think a <span style=3D"font-size:18.6667px;font-family:sans-se=
rif">bit to be allocated for SRv6-TE applications?</span></pre><pre class=
=3D"m_2334948528330543984m_1126900656083700125newpage" style=3D"white-space=
:pre-wrap;font-size:18.6667px;margin-top:0px;margin-bottom:0px"><span style=
=3D"font-size:18.6667px">Not sure about RSVP-TE IPv6 case.</span></pre><pre=
 class=3D"m_2334948528330543984m_1126900656083700125newpage" style=3D"white=
-space:pre-wrap;font-size:18.6667px;margin-top:0px;margin-bottom:0px"><span=
 style=3D"font-size:18.6667px">If you please your opinion.</span></pre><pre=
 class=3D"m_2334948528330543984m_1126900656083700125newpage" style=3D"white=
-space:pre-wrap;font-size:18.6667px;margin-top:0px;margin-bottom:0px"><span=
 style=3D"font-size:18.6667px"><br></span></pre><pre class=3D"m_23349485283=
30543984m_1126900656083700125newpage" style=3D"white-space:pre-wrap;font-si=
ze:18.6667px;margin-top:0px;margin-bottom:0px"><span style=3D"font-size:18.=
6667px">Regards,</span></pre><pre class=3D"m_2334948528330543984m_112690065=
6083700125newpage" style=3D"white-space:pre-wrap;font-size:18.6667px;margin=
-top:0px;margin-bottom:0px"><span style=3D"font-size:18.6667px">Mahendra</s=
pan></pre></div></div></div>

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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/pq-LLUoXAy0QJoorEuqyHUbS25w>
Subject: [Lsr] LSVR Interim meeting details [Webex & agenda details included]
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Hi All,

What:
  LSVR WG Interim Meeting

When:
  1) Date: Friday 8 June 2018
  2) Time: 07:30am PDT (=3D4:30pm CET)=20
  3) Length: 90 minutes

Provisional agenda:

  1) Admin, agenda bashing and WG Status Update (20m - chairs)
  2) Shortest Path Routing Extensions for BGP Protocol (30m - Keyur)
  3) Usage and Applicability of Link State Vector Routing in Data Centers (=
20m - Acee)
  4) Discussion: Next steps regarding Neighbor and Liveliness detection (LL=
DP/LSoE/ECP) (20m - Chairs/All)

Meeting details:

  1) Meeting Link:
  https://ietf.webex.com/ietf/j.php?MTID=3Dmc6db88664131504ccc9cb69278e100e=
c
  2) Meeting number:
  643 222 923
  3) Meeting password:
  jKR2graY
  4) Audio connection:
  1-650-479-3208 Call-in toll number (US/Canada)
  Access code: 643 222 923

Kind Regards,
Gunter & Victor
LSVR co-chairs

-----Original Message-----
From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Van De Velde, Gunter (=
Nokia - BE/Antwerp)
Sent: Friday, June 1, 2018 09:17
To: idr@ietf.org; lsvr@ietf.org; lsr@ietf.org
Cc: draft-ietf-lsvr-bgp-spf@ietf.org
Subject: Re: [Lsr] [Lsvr] I-D Action: draft-ietf-lsvr-bgp-spf-01.txt

Hi All,

Friday 8 June LSVR WG will have a 90 minute interim meeting to discuss the =
updates/feedback/next-steps regarding drafts:

https://www.ietf.org/id/draft-ietf-lsvr-bgp-spf-01.txt
and
https://www.ietf.org/id/draft-keyupate-lsvr-applicability-01.txt

The interim is scheduled for Friday 8 June, 4:30pm CET (=3D 7:30am PDT), us=
ing Webex conference tool.

Agenda, slides and other details will be shared on the datatracker interim =
LSVR page:
https://datatracker.ietf.org/meeting/interim-2018-lsvr-01/session/lsvr

Webex details to be distributed soon in the LSVR WG email list

Brgds,
G/

-----Original Message-----
From: Lsvr [mailto:lsvr-bounces@ietf.org] On Behalf Of internet-drafts@ietf=
.org
Sent: Friday, June 1, 2018 01:40
To: i-d-announce@ietf.org
Cc: lsvr@ietf.org
Subject: [Lsvr] I-D Action: draft-ietf-lsvr-bgp-spf-01.txt


A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.
This draft is a work item of the Link State Vector Routing WG of the IETF.

        Title           : Shortest Path Routing Extensions for BGP Protocol
        Authors         : Keyur Patel
                          Acee Lindem
                          Shawn Zandi
                          Wim Henderickx
	Filename        : draft-ietf-lsvr-bgp-spf-01.txt
	Pages           : 16
	Date            : 2018-05-31

Abstract:
   Many Massively Scaled Data Centers (MSDCs) have converged on
   simplified layer 3 routing.  Furthermore, requirements for
   operational simplicity have lead many of these MSDCs to converge on
   BGP as their single routing protocol for both their fabric routing
   and their Data Center Interconnect (DCI) routing.  This document
   describes a solution which leverages BGP Link-State distribution and
   the Shortest Path First (SPF) algorithm similar to Internal Gateway
   Protocols (IGPs) such as OSPF.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-lsvr-bgp-spf/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-lsvr-bgp-spf-01
https://datatracker.ietf.org/doc/html/draft-ietf-lsvr-bgp-spf-01

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-lsvr-bgp-spf-01


Please note that it may take a couple of minutes from the time of submissio=
n 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/

_______________________________________________
Lsvr mailing list
Lsvr@ietf.org
https://www.ietf.org/mailman/listinfo/lsvr

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr


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Date: Sun, 10 Jun 2018 08:05:11 +0530
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/gp-48DhvGT3ngije7prvnb1Huh0>
Subject: [Lsr] Gentle Reminder!!!Re: draft-ietf-isis-te-app: Clarification on Application Identifier bits
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--00000000000036ae32056e407c8d
Content-Type: text/plain; charset="UTF-8"

Dear Authors,

Could you please help me with the query.

Please confirm about the new bit for SRv6-TE applications.
We are working on this draft implementation.

Regards,
Mahendra

On Wed, Jun 6, 2018, 11:49 Mahend Negi <mahend.ietf@gmail.com> wrote:

>
> Dear Authors,
> I seek few clarifications on "Application Identifier bits".
>
> As defined in the draft:
>
> R-bit: RSVP-TE
> S-bit: Segment Routing Traffic Engineering
>
> F-bit: Loop Free Alternate
> X-bit: Flex-Algo
>
>
> Am I right, when I say:
>
> R-bit: For RSVP-TE on IPv6 and IPv4 networks.
>
> S-bit: For SR MPLS and SRv6-TE applications.
>
>
> I think a bit to be allocated for SRv6-TE applications?
>
> Not sure about RSVP-TE IPv6 case.
>
> If you please your opinion.
>
>
> Regards,
>
> Mahendra
>
>

--00000000000036ae32056e407c8d
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"auto"><div dir=3D"auto">Dear Authors,</div><div dir=3D"auto"><b=
r></div><div dir=3D"auto">Could you please help me with the query.</div><di=
v dir=3D"auto"><br></div><div>Please confirm about the new bit for SRv6-TE =
applications.</div><div dir=3D"auto">We are working on this draft implement=
ation.</div><div dir=3D"auto"><br></div><div dir=3D"auto">Regards,</div><di=
v dir=3D"auto">Mahendra<br><br><div class=3D"gmail_quote" dir=3D"auto"><div=
 dir=3D"ltr">On Wed, Jun 6, 2018, 11:49 Mahend Negi &lt;<a href=3D"mailto:m=
ahend.ietf@gmail.com">mahend.ietf@gmail.com</a>&gt; wrote:<br></div><blockq=
uote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc =
solid;padding-left:1ex"><div dir=3D"auto"><div dir=3D"auto"><br></div><div =
dir=3D"auto"><div dir=3D"auto" style=3D"font-family:sans-serif;font-size:14=
px">Dear Authors,</div><div dir=3D"auto" style=3D"font-family:sans-serif;fo=
nt-size:14px">I seek few clarifications on &quot;Application Identifier bit=
s&quot;.</div><div dir=3D"auto" style=3D"font-family:sans-serif;font-size:1=
4px"><br></div><div dir=3D"auto" style=3D"font-family:sans-serif;font-size:=
14px">As defined in the draft:<br></div><div dir=3D"auto" style=3D"font-fam=
ily:sans-serif;font-size:14px"><br></div><div dir=3D"auto" style=3D"font-fa=
mily:sans-serif;font-size:14px"><pre class=3D"m_-781114521952197885m_233494=
8528330543984m_1126900656083700125newpage" style=3D"white-space:pre-wrap;fo=
nt-size:18.6667px;margin-top:0px;margin-bottom:0px">R-bit: RSVP-TE
S-bit: Segment Routing=C2=A0<span style=3D"font-size:18.6667px;font-family:=
sans-serif">Traffic Engineering=C2=A0</span></pre><pre class=3D"m_-78111452=
1952197885m_2334948528330543984m_1126900656083700125newpage" style=3D"white=
-space:pre-wrap;font-size:18.6667px;margin-top:0px;margin-bottom:0px">F-bit=
: Loop Free Alternate
X-bit: Flex-Algo</pre><pre class=3D"m_-781114521952197885m_2334948528330543=
984m_1126900656083700125newpage" style=3D"white-space:pre-wrap;font-size:18=
.6667px;margin-top:0px;margin-bottom:0px"><span style=3D"font-size:18.6667p=
x"><br></span></pre><pre class=3D"m_-781114521952197885m_233494852833054398=
4m_1126900656083700125newpage" style=3D"white-space:pre-wrap;font-size:18.6=
667px;margin-top:0px;margin-bottom:0px"><span style=3D"font-size:18.6667px"=
>Am I right, when I say:</span></pre><pre class=3D"m_-781114521952197885m_2=
334948528330543984m_1126900656083700125newpage" style=3D"white-space:pre-wr=
ap;font-size:18.6667px;margin-top:0px;margin-bottom:0px">R-bit: For RSVP-TE=
 on IPv6 <span style=3D"font-size:18.6667px">and IPv4 networks.</span></pre=
><pre class=3D"m_-781114521952197885m_2334948528330543984m_1126900656083700=
125newpage" style=3D"white-space:pre-wrap;font-size:18.6667px;margin-top:0p=
x;margin-bottom:0px"><span style=3D"font-size:18.6667px">S-bit: For SR MPLS=
 and SRv6-TE=C2=A0applications.</span></pre><pre class=3D"m_-78111452195219=
7885m_2334948528330543984m_1126900656083700125newpage" style=3D"white-space=
:pre-wrap;font-size:18.6667px;margin-top:0px;margin-bottom:0px"><span style=
=3D"font-size:18.6667px"><br></span></pre><pre class=3D"m_-7811145219521978=
85m_2334948528330543984m_1126900656083700125newpage" style=3D"white-space:p=
re-wrap;font-size:18.6667px;margin-top:0px;margin-bottom:0px">I think a <sp=
an style=3D"font-size:18.6667px;font-family:sans-serif">bit to be allocated=
 for SRv6-TE applications?</span></pre><pre class=3D"m_-781114521952197885m=
_2334948528330543984m_1126900656083700125newpage" style=3D"white-space:pre-=
wrap;font-size:18.6667px;margin-top:0px;margin-bottom:0px"><span style=3D"f=
ont-size:18.6667px">Not sure about RSVP-TE IPv6 case.</span></pre><pre clas=
s=3D"m_-781114521952197885m_2334948528330543984m_1126900656083700125newpage=
" style=3D"white-space:pre-wrap;font-size:18.6667px;margin-top:0px;margin-b=
ottom:0px"><span style=3D"font-size:18.6667px">If you please your opinion.<=
/span></pre><pre class=3D"m_-781114521952197885m_2334948528330543984m_11269=
00656083700125newpage" style=3D"white-space:pre-wrap;font-size:18.6667px;ma=
rgin-top:0px;margin-bottom:0px"><span style=3D"font-size:18.6667px"><br></s=
pan></pre><pre class=3D"m_-781114521952197885m_2334948528330543984m_1126900=
656083700125newpage" style=3D"white-space:pre-wrap;font-size:18.6667px;marg=
in-top:0px;margin-bottom:0px"><span style=3D"font-size:18.6667px">Regards,<=
/span></pre><pre class=3D"m_-781114521952197885m_2334948528330543984m_11269=
00656083700125newpage" style=3D"white-space:pre-wrap;font-size:18.6667px;ma=
rgin-top:0px;margin-bottom:0px"><span style=3D"font-size:18.6667px">Mahendr=
a</span></pre></div></div></div>
</blockquote></div></div></div>

--00000000000036ae32056e407c8d--


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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Mahend Negi <mahend.ietf@gmail.com>, "draft-ietf-isis-te-app@ietf.org" <draft-ietf-isis-te-app@ietf.org>
CC: "lsr@ietf.org" <lsr@ietf.org>, "stefano@previdi.net" <stefano@previdi.net>, "jdrake@juniper.net" <jdrake@juniper.net>
Thread-Topic: Gentle Reminder!!!Re: draft-ietf-isis-te-app: Clarification on Application Identifier bits
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Date: Mon, 11 Jun 2018 14:07:36 +0000
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Subject: Re: [Lsr] Gentle Reminder!!!Re: draft-ietf-isis-te-app: Clarification on Application Identifier bits
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From: Uma Chunduri <umac.ietf@gmail.com>
Date: Mon, 11 Jun 2018 12:18:19 -0700
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Subject: [Lsr] IPR Poll on draft-ietf-isis-segment-routing-extensions-16 (Shepherd write-up)
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Dear All,

Are you aware of any IPR that applies to
https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions-16 ?

Sending this email as suggested by LSR chairs - as this was not noticed
during/around WGLC.

===
If so, has this IPR been disclosed in compliance with IETF IPR rules
(see RFCs 3979, 4879, 3669 and 5378 for more details).

If you are listed as a document author or contributor please respond
to this email regardless of whether or not you are aware of any
relevant IPR. *The response needs to be sent to the LSR WG mailing
list.* The document will not advance to the next stage until a
response has been received from each author and contributor.

If you are on the LSR WG email list but are not listed as an author or
contributor, then please explicitly respond only if you are aware of
any IPR that has not yet been disclosed in conformance with IETF rules.
===

--
Uma C.

--000000000000c66339056e629cc3
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<div dir=3D"ltr">Dear All,<div><br></div><div><div>Are you aware of any IPR=
 that applies to=C2=A0</div><div><a href=3D"https://tools.ietf.org/html/dra=
ft-ietf-isis-segment-routing-extensions-16">https://tools.ietf.org/html/dra=
ft-ietf-isis-segment-routing-extensions-16</a> ?=C2=A0</div><div><br></div>=
<div>Sending this email as suggested by LSR chairs - as this was not notice=
d during/around WGLC.</div><div><br></div><div>=3D=3D=3D</div><div>If so, h=
as this IPR been disclosed in compliance with IETF IPR rules=C2=A0</div><di=
v>(see RFCs 3979, 4879, 3669 and 5378 for more details).</div><div><br></di=
v><div>If you are listed as a document author or contributor please respond=
</div><div>to this email regardless of whether or not you are aware of any<=
/div><div>relevant IPR. *The response needs to be sent to the LSR WG mailin=
g</div><div>list.* The document will not advance to the next stage until a<=
/div><div>response has been received from each author and contributor.</div=
><div><br></div><div>If you are on the LSR WG email list but are not listed=
 as an author or</div><div>contributor, then please explicitly respond only=
 if you are aware of</div><div>any IPR that has not yet been disclosed in c=
onformance with IETF rules.</div></div><div>=3D=3D=3D</div><div><br></div><=
div>--</div><div>Uma C.</div></div>

--000000000000c66339056e629cc3--


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Date: Mon, 11 Jun 2018 13:44:28 -0700
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: Uma Chunduri <umac.ietf@gmail.com>, <lsr@ietf.org>
Message-ID: <D617C099-C82F-4744-A14E-692610360F3E@gmail.com>
Thread-Topic: [Lsr] IPR Poll on draft-ietf-isis-segment-routing-extensions-16 (Shepherd write-up)
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Subject: Re: [Lsr] IPR Poll on draft-ietf-isis-segment-routing-extensions-16 (Shepherd write-up)
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Uma,

=20

I=E2=80=99m not aware of any IPR that has not been previously disclosed.=20

=20

Cheers,

Jeff

From: Lsr <lsr-bounces@ietf.org> on behalf of Uma Chunduri <umac.ietf@gmail=
.com>
Date: Monday, June 11, 2018 at 12:18
To: <lsr@ietf.org>
Subject: [Lsr] IPR Poll on draft-ietf-isis-segment-routing-extensions-16 (S=
hepherd write-up)

=20

Dear All,

=20

Are you aware of any IPR that applies to=20

https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions-16 ?=
=20

=20

Sending this email as suggested by LSR chairs - as this was not noticed dur=
ing/around WGLC.

=20

=3D=3D=3D

If so, has this IPR been disclosed in compliance with IETF IPR rules=20

(see RFCs 3979, 4879, 3669 and 5378 for more details).

=20

If you are listed as a document author or contributor please respond

to this email regardless of whether or not you are aware of any

relevant IPR. *The response needs to be sent to the LSR WG mailing

list.* The document will not advance to the next stage until a

response has been received from each author and contributor.

=20

If you are on the LSR WG email list but are not listed as an author or

contributor, then please explicitly respond only if you are aware of

any IPR that has not yet been disclosed in conformance with IETF rules.

=3D=3D=3D

=20

--

Uma C.

_______________________________________________ Lsr mailing list Lsr@ietf.o=
rg https://www.ietf.org/mailman/listinfo/lsr=20


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--></style></head><body lang=3DEN-US link=3Dblue vlink=3Dpurple><div class=3DWordSe=
ction1><p class=3DMsoNormal>Uma,<o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;<=
/o:p></p><p class=3DMsoNormal>I=E2=80=99m not aware of any IPR that has not been pre=
viously disclosed. <o:p></o:p></p><p class=3DMsoNormal><o:p>&nbsp;</o:p></p><d=
iv><p class=3DMsoNormal><span style=3D'color:black'>Cheers,<o:p></o:p></span></p=
></div><p class=3DMsoNormal><span style=3D'color:black'>Jeff</span><o:p></o:p></=
p><div style=3D'border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0=
in 0in'><p class=3DMsoNormal><b><span style=3D'font-size:12.0pt;color:black'>Fro=
m: </span></b><span style=3D'font-size:12.0pt;color:black'>Lsr &lt;lsr-bounces=
@ietf.org&gt; on behalf of Uma Chunduri &lt;umac.ietf@gmail.com&gt;<br><b>Da=
te: </b>Monday, June 11, 2018 at 12:18<br><b>To: </b>&lt;lsr@ietf.org&gt;<br=
><b>Subject: </b>[Lsr] IPR Poll on draft-ietf-isis-segment-routing-extension=
s-16 (Shepherd write-up)<o:p></o:p></span></p></div><div><p class=3DMsoNormal>=
<o:p>&nbsp;</o:p></p></div><div><p class=3DMsoNormal><a name=3D"_MailOriginalBod=
y">Dear All,<o:p></o:p></a></p><div><p class=3DMsoNormal><span style=3D'mso-book=
mark:_MailOriginalBody'><o:p>&nbsp;</o:p></span></p></div><div><div><p class=
=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'>Are you aware of any=
 IPR that applies to&nbsp;<o:p></o:p></span></p></div><div><p class=3DMsoNorma=
l><span style=3D'mso-bookmark:_MailOriginalBody'></span><a href=3D"https://tools=
.ietf.org/html/draft-ietf-isis-segment-routing-extensions-16"><span style=3D'm=
so-bookmark:_MailOriginalBody'>https://tools.ietf.org/html/draft-ietf-isis-s=
egment-routing-extensions-16</span><span style=3D'mso-bookmark:_MailOriginalBo=
dy'></span></a><span style=3D'mso-bookmark:_MailOriginalBody'> ?&nbsp;<o:p></o=
:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailO=
riginalBody'><o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span=
 style=3D'mso-bookmark:_MailOriginalBody'>Sending this email as suggested by L=
SR chairs - as this was not noticed during/around WGLC.<o:p></o:p></span></p=
></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'>=
<o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-b=
ookmark:_MailOriginalBody'>=3D=3D=3D<o:p></o:p></span></p></div><div><p class=3DMsoN=
ormal><span style=3D'mso-bookmark:_MailOriginalBody'>If so, has this IPR been =
disclosed in compliance with IETF IPR rules&nbsp;<o:p></o:p></span></p></div=
><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'>(see R=
FCs 3979, 4879, 3669 and 5378 for more details).<o:p></o:p></span></p></div>=
<div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><o:p>&n=
bsp;</o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark=
:_MailOriginalBody'>If you are listed as a document author or contributor pl=
ease respond<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D=
'mso-bookmark:_MailOriginalBody'>to this email regardless of whether or not =
you are aware of any<o:p></o:p></span></p></div><div><p class=3DMsoNormal><spa=
n style=3D'mso-bookmark:_MailOriginalBody'>relevant IPR. *The response needs t=
o be sent to the LSR WG mailing<o:p></o:p></span></p></div><div><p class=3DMso=
Normal><span style=3D'mso-bookmark:_MailOriginalBody'>list.* The document will=
 not advance to the next stage until a<o:p></o:p></span></p></div><div><p cl=
ass=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'>response has been=
 received from each author and contributor.<o:p></o:p></span></p></div><div>=
<p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'><o:p>&nbsp;<=
/o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_Mai=
lOriginalBody'>If you are on the LSR WG email list but are not listed as an =
author or<o:p></o:p></span></p></div><div><p class=3DMsoNormal><span style=3D'ms=
o-bookmark:_MailOriginalBody'>contributor, then please explicitly respond on=
ly if you are aware of<o:p></o:p></span></p></div><div><p class=3DMsoNormal><s=
pan style=3D'mso-bookmark:_MailOriginalBody'>any IPR that has not yet been dis=
closed in conformance with IETF rules.<o:p></o:p></span></p></div></div><div=
><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'>=3D=3D=3D<o:p></o=
:p></span></p></div><div><p class=3DMsoNormal><span style=3D'mso-bookmark:_MailO=
riginalBody'><o:p>&nbsp;</o:p></span></p></div><div><p class=3DMsoNormal><span=
 style=3D'mso-bookmark:_MailOriginalBody'>--<o:p></o:p></span></p></div><div><=
p class=3DMsoNormal><span style=3D'mso-bookmark:_MailOriginalBody'>Uma C.<o:p></=
o:p></span></p></div></div><p class=3DMsoNormal><span style=3D'mso-bookmark:_Mai=
lOriginalBody'>_______________________________________________ Lsr mailing l=
ist Lsr@ietf.org https://www.ietf.org/mailman/listinfo/lsr </span><o:p></o:p=
></p></div></body></html>

--B_3611569470_2007314731--



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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Uma Chunduri <umac.ietf@gmail.com>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: [Lsr] IPR Poll on draft-ietf-isis-segment-routing-extensions-16 (Shepherd write-up)
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Date: Mon, 11 Jun 2018 20:50:22 +0000
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To: "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>, Uma Chunduri <umac.ietf@gmail.com>, "lsr@ietf.org" <lsr@ietf.org>
References: <CAF18ct5OPY+YMLab5fOLpun=3+4G_KTXNyaMk7BkGsyhA7YHHQ@mail.gmail.com> <3803949de3084418b7aab8a27febc2ad@XCH-ALN-001.cisco.com>
From: Ahmed Bashandy <abashandy.ietf@gmail.com>
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Date: Mon, 11 Jun 2018 14:14:53 -0700
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Subject: Re: [Lsr] IPR Poll on draft-ietf-isis-segment-routing-extensions-16 (Shepherd write-up)
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I am not aware of any IPR other than what has not been already disclosed.

Thanks

Ahmed


On 6/11/18 1:50 PM, Les Ginsberg (ginsberg) wrote:
>
> I am not aware of any IPR other than what has already been disclosed.
>
> Les
>
> *From:*Lsr <lsr-bounces@ietf.org> *On Behalf Of *Uma Chunduri
> *Sent:* Monday, June 11, 2018 12:18 PM
> *To:* lsr@ietf.org
> *Subject:* [Lsr] IPR Poll on 
> draft-ietf-isis-segment-routing-extensions-16 (Shepherd write-up)
>
> Dear All,
>
> Are you aware of any IPR that applies to
>
> https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions-16 
> ?
>
> Sending this email as suggested by LSR chairs - as this was not 
> noticed during/around WGLC.
>
> ===
>
> If so, has this IPR been disclosed in compliance with IETF IPR rules
>
> (see RFCs 3979, 4879, 3669 and 5378 for more details).
>
> If you are listed as a document author or contributor please respond
>
> to this email regardless of whether or not you are aware of any
>
> relevant IPR. *The response needs to be sent to the LSR WG mailing
>
> list.* The document will not advance to the next stage until a
>
> response has been received from each author and contributor.
>
> If you are on the LSR WG email list but are not listed as an author or
>
> contributor, then please explicitly respond only if you are aware of
>
> any IPR that has not yet been disclosed in conformance with IETF rules.
>
> ===
>
> --
>
> Uma C.
>
>
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr


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    <p>I am not aware of <span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">any
        IPR other than what has not been already disclosed.</span></p>
    <p><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Thanks<br>
      </span></p>
    <p><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">Ahmed
        <br>
      </span></p>
    <br>
    <div class="moz-cite-prefix">On 6/11/18 1:50 PM, Les Ginsberg
      (ginsberg) wrote:<br>
    </div>
    <blockquote type="cite"
      cite="mid:3803949de3084418b7aab8a27febc2ad@XCH-ALN-001.cisco.com">
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        <p class="MsoNormal"><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1F497D">I
            am not aware of any IPR other than what has already been
            disclosed.<o:p></o:p></span></p>
        <p class="MsoNormal"><span
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        <p class="MsoNormal"><span
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            Les<o:p></o:p></span></p>
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              1.0pt;padding:3.0pt 0in 0in 0in">
              <p class="MsoNormal"><b><span
                    style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">From:</span></b><span
style="font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"> Lsr
                  <a class="moz-txt-link-rfc2396E" href="mailto:lsr-bounces@ietf.org">&lt;lsr-bounces@ietf.org&gt;</a>
                  <b>On Behalf Of </b>Uma Chunduri<br>
                  <b>Sent:</b> Monday, June 11, 2018 12:18 PM<br>
                  <b>To:</b> <a class="moz-txt-link-abbreviated" href="mailto:lsr@ietf.org">lsr@ietf.org</a><br>
                  <b>Subject:</b> [Lsr] IPR Poll on
                  draft-ietf-isis-segment-routing-extensions-16
                  (Shepherd write-up)<o:p></o:p></span></p>
            </div>
          </div>
          <p class="MsoNormal"><o:p> </o:p></p>
          <div>
            <p class="MsoNormal">Dear All,<o:p></o:p></p>
            <div>
              <p class="MsoNormal"><o:p> </o:p></p>
            </div>
            <div>
              <div>
                <p class="MsoNormal">Are you aware of any IPR that
                  applies to <o:p></o:p></p>
              </div>
              <div>
                <p class="MsoNormal"><a
href="https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions-16"
                    moz-do-not-send="true">https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions-16</a>
                  ? <o:p></o:p></p>
              </div>
              <div>
                <p class="MsoNormal"><o:p> </o:p></p>
              </div>
              <div>
                <p class="MsoNormal">Sending this email as suggested by
                  LSR chairs - as this was not noticed during/around
                  WGLC.<o:p></o:p></p>
              </div>
              <div>
                <p class="MsoNormal"><o:p> </o:p></p>
              </div>
              <div>
                <p class="MsoNormal">===<o:p></o:p></p>
              </div>
              <div>
                <p class="MsoNormal">If so, has this IPR been disclosed
                  in compliance with IETF IPR rules <o:p></o:p></p>
              </div>
              <div>
                <p class="MsoNormal">(see RFCs 3979, 4879, 3669 and 5378
                  for more details).<o:p></o:p></p>
              </div>
              <div>
                <p class="MsoNormal"><o:p> </o:p></p>
              </div>
              <div>
                <p class="MsoNormal">If you are listed as a document
                  author or contributor please respond<o:p></o:p></p>
              </div>
              <div>
                <p class="MsoNormal">to this email regardless of whether
                  or not you are aware of any<o:p></o:p></p>
              </div>
              <div>
                <p class="MsoNormal">relevant IPR. *The response needs
                  to be sent to the LSR WG mailing<o:p></o:p></p>
              </div>
              <div>
                <p class="MsoNormal">list.* The document will not
                  advance to the next stage until a<o:p></o:p></p>
              </div>
              <div>
                <p class="MsoNormal">response has been received from
                  each author and contributor.<o:p></o:p></p>
              </div>
              <div>
                <p class="MsoNormal"><o:p> </o:p></p>
              </div>
              <div>
                <p class="MsoNormal">If you are on the LSR WG email list
                  but are not listed as an author or<o:p></o:p></p>
              </div>
              <div>
                <p class="MsoNormal">contributor, then please explicitly
                  respond only if you are aware of<o:p></o:p></p>
              </div>
              <div>
                <p class="MsoNormal">any IPR that has not yet been
                  disclosed in conformance with IETF rules.<o:p></o:p></p>
              </div>
            </div>
            <div>
              <p class="MsoNormal">===<o:p></o:p></p>
            </div>
            <div>
              <p class="MsoNormal"><o:p> </o:p></p>
            </div>
            <div>
              <p class="MsoNormal">--<o:p></o:p></p>
            </div>
            <div>
              <p class="MsoNormal">Uma C.<o:p></o:p></p>
            </div>
          </div>
        </div>
      </div>
      <!--'"--><br>
      <fieldset class="mimeAttachmentHeader"></fieldset>
      <br>
      <pre wrap="">_______________________________________________
Lsr mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Lsr@ietf.org">Lsr@ietf.org</a>
<a class="moz-txt-link-freetext" href="https://www.ietf.org/mailman/listinfo/lsr">https://www.ietf.org/mailman/listinfo/lsr</a>
</pre>
    </blockquote>
    <br>
  </body>
</html>

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Date: Mon, 11 Jun 2018 18:27:27 -0700
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--000000000000eecead056e67c4af
Content-Type: text/plain; charset="UTF-8"

Dear Authors,

I have done shepherd  review of  draft-ietf-isis-segment-routing-extensions-16
document as requested by LSR chairs. First, I would like to thank all the
the authors and contributors on this document.
I have few minor comments below  and would be great if authors take a look
at these.


=====


A. I see few ID nits (comments and warnings). Please fix  those.

B. For the record: (as this would come up soon) : Currently there are 8
front page authors and please indicate why this document should be given
exception w.r.t 5 co-authors norm, that is being followed in general.


1. Abstract & Section 1



a.

   "These segments are   advertised by the link-state routing protocols
(IS-IS and OSPF)."



   I see more than LSR protocols e.g.
https://tools.ietf.org/html/draft-ietf-idr-bgp-prefix-sid-07

   Also not sure if this statement is necessary. Please either correct or
remove this.



b.

   "Two    types of segments are defined, Prefix segments and Adjacency
segments."



   This document defines more than these two if you include Section 2.4
(SID/Label Binding TLV). Section 2 is much better

   where all types in this document are described as well as
[I-D.ietf-spring-segment-routing]
is referred for other types.

   In that sense the above statement looks incomplete/repetitive.



 2. Section 2.1



a. "The 'Prefix SID' MUST   be unique within a given IGP domain (when the
L-flag is not set)."



   I see this is conflicting with what's been defined in
https://tools.ietf.org/html/draft-ietf-spring-segment-routing-14,

section 3.3 -

   "Within an anycast group, all routers in an SR domain MUST advertise  the
same prefix with the same SID value."



   If you see otherwise please explain why?



b. "A 4 octet index defining.."

What happens  to the computed label value if the index is of 4 octets
value? I am asking this as index can have 4 octets but the eventual label
(SRGB offset + index) would be only 20 bits.

Can you point (if any)  references to
https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls
appropriate sections -  is this is addressed there?



c. "A Prefix-SID sub-TLV is associated to a prefix advertised by a node    and
MAY be present in any of the following TLVs:"



     Nit: Perhaps the list should include Section 2.5 too.



3. Section 2.2.1



a. "F-Flag: Address-Family flag..."



     Not sure why this has to do with encapsulation? What happens if native
IPv4/IPv6 data packet is using this SID with out any encapsulation? Could
you please clarify.



4. Section 2.2.2



a. Nit: V and L flags: Content is duplicated and perhaps it can instead
refer to section 2.2.1

5. Section 3.2 and Section 2.1

    Could you please clarify what is preferred if multiple prefix-sids with
different algorithm values are advertised for the same SID value?
--
Uma C.

--000000000000eecead056e67c4af
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Dear Authors,<div><br></div><div>
















<span style=3D"font-size:12pt;font-family:&quot;Times New Roman&quot;,serif=
">I have done shepherd=C2=A0 review of=C2=A0=C2=A0</span><font face=3D"Time=
s New Roman, serif"><span style=3D"font-size:16px">draft-ietf-isis-segment-=
routing-extensions-16 document as requested by LSR chairs.=C2=A0</span></fo=
nt><span style=3D"font-family:&quot;Times New Roman&quot;,serif;font-size:1=
2pt">First, I would like to thank all the the authors and contributors on t=
his document.</span></div><div><span style=3D"font-family:&quot;Times New R=
oman&quot;,serif;font-size:12pt">I have few minor comments below=C2=A0 and =
would be great if authors take a look at these.</span></div><div><span styl=
e=3D"font-family:&quot;Times New Roman&quot;,serif;font-size:12pt"><br></sp=
an></div><div><span style=3D"font-family:&quot;Times New Roman&quot;,serif;=
font-size:12pt"><br></span></div><div><span style=3D"font-family:&quot;Time=
s New Roman&quot;,serif;font-size:12pt">


















<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:Calibri,sans-serif">=3D=3D=3D=3D=3D</p><p class=3D"MsoNormal" style=
=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">=
<br></p><p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:1=
1pt;font-family:Calibri,sans-serif">A. I see few ID nits (comments and warn=
ings). Please fix=C2=A0 those.</p><p class=3D"MsoNormal" style=3D"margin:0i=
n 0in 0.0001pt;font-size:11pt;font-family:Calibri,sans-serif">B. For the re=
cord: (as this would come up soon) : Currently there are 8=C2=A0 front page=
 authors and please indicate why this document should be given exception w.=
r.t 5 co-authors norm, that is being followed in general.</p><p class=3D"Ms=
oNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font-family:Calibr=
i,sans-serif"><br></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:Calibri,sans-serif"><span>1. Abstract &amp; Section 1<span></span><=
/span></p>

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

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

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:Calibri,sans-serif"><span><span>=C2=A0=C2=A0 </span>&quot;These seg=
ments are <span>=C2=A0=C2=A0</span>advertised by the link-state routing
protocols (IS-IS and OSPF).&quot;<span></span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:Calibri,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:Calibri,sans-serif"><span><span>=C2=A0=C2=A0 </span>I see more than=
 LSR protocols e.g.
<a href=3D"https://tools.ietf.org/html/draft-ietf-idr-bgp-prefix-sid-07">ht=
tps://tools.ietf.org/html/draft-ietf-idr-bgp-prefix-sid-07</a><span></span>=
</span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:Calibri,sans-serif"><span><span>=C2=A0=C2=A0 </span>Also not sure i=
f this statement is
necessary. Please either correct or remove this.<span></span></span></p>

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

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:Calibri,sans-serif"><span><span>=C2=A0=C2=A0 </span>&quot;Two <span=
>=C2=A0=C2=A0=C2=A0</span>types of segments are defined, Prefix
segments and Adjacency <span>=C2=A0=C2=A0</span>segments.&quot;<span></span=
></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:Calibri,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:Calibri,sans-serif"><span><span>=C2=A0=C2=A0 </span>This document d=
efines more than these two if
you include Section 2.4 (SID/Label Binding TLV). Section 2 is much better <=
span></span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:Calibri,sans-serif"><span><span>=C2=A0=C2=A0 </span>where all types=
 in this document are
described as well as<span>=C2=A0=C2=A0
</span>[I-D.ietf-spring-segment-routing] is referred for other types. <span=
></span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:Calibri,sans-serif"><span><span>=C2=A0=C2=A0 </span>In that sense t=
he above statement looks
incomplete/repetitive.<span></span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:Calibri,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:Calibri,sans-serif"><span><span>=C2=A0</span></span><span style=3D"=
font-size:11pt">2. Section 2.1</span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:Calibri,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:Calibri,sans-serif"><span>a. &quot;The &#39;Prefix SID&#39;
MUST <span>=C2=A0=C2=A0</span>be unique within a given IGP
domain (when the L-flag is not set).&quot;<span></span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:Calibri,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:Calibri,sans-serif"><span><span>=C2=A0=C2=A0 </span>I see this is c=
onflicting with what&#39;s been
defined in <a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment=
-routing-14">https://tools.ietf.org/html/draft-ietf-spring-segment-routing-=
14</a>, <span></span></span></p>

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

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt 0.5in;font-size:11p=
t;font-family:Calibri,sans-serif"><span>section
3.3 -<span></span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt 0.5in;font-size:11p=
t;font-family:Calibri,sans-serif"><span><span>=C2=A0=C2=A0 </span>&quot;Wit=
hin an anycast group, all routers
in an SR domain MUST advertise=C2=A0</span><span style=3D"font-size:11pt">=
=C2=A0</span><span style=3D"font-size:11pt">the same prefix with the same S=
ID
value.&quot;</span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:Calibri,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:Cal=
ibri,sans-serif"><span style=3D"font-size:11pt">=C2=A0 =C2=A0</span><span s=
tyle=3D"font-size:11pt">If you see otherwise please explain why?</span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:Calibri,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:Calibri,sans-serif"><span>b. &quot;A 4 octet index
defining..&quot;<span></span></span></p>

<p class=3D"MsoNormal" style=3D"text-indent:9pt;margin:0in 0in 0.0001pt;fon=
t-size:11pt;font-family:Calibri,sans-serif"><span>What
happens<span>=C2=A0 </span>to the computed label value if
the index is of 4 octets value? I am asking this as index can have 4 octets=
 but the
eventual label (SRGB offset + index) would be only 20 bits. <span></span></=
span></p>

<p class=3D"MsoNormal" style=3D"text-indent:9pt;margin:0in 0in 0.0001pt;fon=
t-size:11pt;font-family:Calibri,sans-serif"><span>Can
you point (if any)=C2=A0 references to <a href=3D"https://tools.ietf.org/ht=
ml/draft-ietf-spring-segment-routing-mpls">https://tools.ietf.org/html/draf=
t-ietf-spring-segment-routing-mpls</a>
appropriate sections -=C2=A0 is this is addressed there?<span></span></span=
></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:Calibri,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:Calibri,sans-serif"><span>c. &quot;A Prefix-SID sub-TLV
is associated to a prefix advertised by a node <span>=C2=A0=C2=A0=C2=A0</sp=
an>and MAY be present in any of the following
TLVs:&quot;<span></span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:Calibri,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:Calibri,sans-serif"><span><span>=C2=A0 </span><span>=C2=A0=C2=A0</s=
pan><span>=C2=A0</span>Nit: Perhaps the list should include Section
2.5 too.<span></span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:Calibri,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:Calibri,sans-serif"><span>3. Section 2.2.1<span></span></span></p>

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

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:Calibri,sans-serif"><span>a. &quot;F-Flag:
Address-Family flag...&quot; <span></span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:Calibri,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:Calibri,sans-serif"><span><span>=C2=A0=C2=A0=C2=A0=C2=A0 </span>Not=
 sure why this has to do with
encapsulation? What happens if native IPv4/IPv6 data packet is using this S=
ID
with out any encapsulation? Could you please clarify.<span></span></span></=
p>

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

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:Calibri,sans-serif"><span>4. Section 2.2.2<span></span></span></p>

<p class=3D"MsoNormal" style=3D"margin:0in 0in 0.0001pt;font-size:11pt;font=
-family:Calibri,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:Calibri,sans-serif"><span>a. Nit: V and L flags:
Content is duplicated and perhaps it can instead refer to section 2.2.1<spa=
n></span></span></p>





<br></span></div><div>5. Section 3.2 and Section 2.1</div><div><br></div><d=
iv>=C2=A0 =C2=A0 Could you please clarify what is preferred if multiple pre=
fix-sids with different algorithm values are advertised for the same SID va=
lue?=C2=A0</div><div><span style=3D"font-family:&quot;Times New Roman&quot;=
,serif;font-size:12pt">--</span></div><div><span style=3D"font-family:&quot=
;Times New Roman&quot;,serif;font-size:12pt">Uma C.</span></div></div>

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To: Uma Chunduri <umac.ietf@gmail.com>
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Subject: Re: [Lsr] IPR Poll on draft-ietf-isis-segment-routing-extensions-16 (Shepherd write-up)
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i am not aware of undisclosed IPR.

> On 11.06.2018, at 21:18, Uma Chunduri <umac.ietf@gmail.com> wrote:
>=20
> Dear All,
>=20
> Are you aware of any IPR that applies to=20
> https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions-16 ?=
=20
>=20
> Sending this email as suggested by LSR chairs - as this was not noticed du=
ring/around WGLC.
>=20
> =3D=3D=3D
> If so, has this IPR been disclosed in compliance with IETF IPR rules=20
> (see RFCs 3979, 4879, 3669 and 5378 for more details).
>=20
> If you are listed as a document author or contributor please respond
> to this email regardless of whether or not you are aware of any
> relevant IPR. *The response needs to be sent to the LSR WG mailing
> list.* The document will not advance to the next stage until a
> response has been received from each author and contributor.
>=20
> If you are on the LSR WG email list but are not listed as an author or
> contributor, then please explicitly respond only if you are aware of
> any IPR that has not yet been disclosed in conformance with IETF rules.
> =3D=3D=3D
>=20
> --
> Uma C.
> _______________________________________________
> 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"><div></div><div>i am not aware of undisclos=
ed IPR.</div><div><br>On 11.06.2018, at 21:18, Uma Chunduri &lt;<a href=3D"m=
ailto:umac.ietf@gmail.com">umac.ietf@gmail.com</a>&gt; wrote:<br><br></div><=
blockquote type=3D"cite"><div><div dir=3D"ltr">Dear All,<div><br></div><div>=
<div>Are you aware of any IPR that applies to&nbsp;</div><div><a href=3D"htt=
ps://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions-16">http=
s://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions-16</a> ?&=
nbsp;</div><div><br></div><div>Sending this email as suggested by LSR chairs=
 - as this was not noticed during/around WGLC.</div><div><br></div><div>=3D=3D=
=3D</div><div>If so, has this IPR been disclosed in compliance with IETF IPR=
 rules&nbsp;</div><div>(see RFCs 3979, 4879, 3669 and 5378 for more details)=
.</div><div><br></div><div>If you are listed as a document author or contrib=
utor please respond</div><div>to this email regardless of whether or not you=
 are aware of any</div><div>relevant IPR. *The response needs to be sent to t=
he LSR WG mailing</div><div>list.* The document will not advance to the next=
 stage until a</div><div>response has been received from each author and con=
tributor.</div><div><br></div><div>If you are on the LSR WG email list but a=
re not listed as an author or</div><div>contributor, then please explicitly r=
espond only if you are aware of</div><div>any IPR that has not yet been disc=
losed in conformance with IETF rules.</div></div><div>=3D=3D=3D</div><div><b=
r></div><div>--</div><div>Uma C.</div></div>
</div></blockquote><blockquote type=3D"cite"><div><span>____________________=
___________________________</span><br><span>Lsr mailing list</span><br><span=
><a href=3D"mailto:Lsr@ietf.org">Lsr@ietf.org</a></span><br><span><a href=3D=
"https://www.ietf.org/mailman/listinfo/lsr">https://www.ietf.org/mailman/lis=
tinfo/lsr</a></span><br></div></blockquote></body></html>=

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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Uma Chunduri <umac.ietf@gmail.com>, "lsr@ietf.org" <lsr@ietf.org>
CC: "draft-ietf-isis-segment-routing-extensions@ietf.org" <draft-ietf-isis-segment-routing-extensions@ietf.org>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>, "lsr-ads@ietf.org" <lsr-ads@ietf.org>
Thread-Topic: draft-ietf-isis-segment-routing-extensions-16 - Shepherd review comments
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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Uma Chunduri <umac.ietf@gmail.com>, "lsr@ietf.org" <lsr@ietf.org>
CC: "draft-ietf-isis-segment-routing-extensions@ietf.org" <draft-ietf-isis-segment-routing-extensions@ietf.org>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>, "lsr-ads@ietf.org" <lsr-ads@ietf.org>
Thread-Topic: draft-ietf-isis-segment-routing-extensions-16 - Shepherd review comments
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From: "Stefano Previdi (IETF)" <s@previdi.net>
Date: Tue, 12 Jun 2018 09:24:18 +0200
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To: Uma Chunduri <umac.ietf@gmail.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/KMMvtH90pOnyjYTvgBqAtMPShk8>
Subject: Re: [Lsr] IPR Poll on draft-ietf-isis-segment-routing-extensions-16 (Shepherd write-up)
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I'm not aware of any undisclosed IPR.

s.


On Mon, Jun 11, 2018, 9:18 PM Uma Chunduri <umac.ietf@gmail.com> wrote:

> Dear All,
>
> Are you aware of any IPR that applies to
> https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions-16
> ?
>
> Sending this email as suggested by LSR chairs - as this was not noticed
> during/around WGLC.
>
> ===
> If so, has this IPR been disclosed in compliance with IETF IPR rules
> (see RFCs 3979, 4879, 3669 and 5378 for more details).
>
> If you are listed as a document author or contributor please respond
> to this email regardless of whether or not you are aware of any
> relevant IPR. *The response needs to be sent to the LSR WG mailing
> list.* The document will not advance to the next stage until a
> response has been received from each author and contributor.
>
> If you are on the LSR WG email list but are not listed as an author or
> contributor, then please explicitly respond only if you are aware of
> any IPR that has not yet been disclosed in conformance with IETF rules.
> ===
>
> --
> Uma C.
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>

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<div dir=3D"auto"><div>I&#39;m not aware of any undisclosed IPR.<div dir=3D=
"auto"><br></div><div dir=3D"auto">s.</div><br><br><div class=3D"gmail_quot=
e"><div dir=3D"ltr">On Mon, Jun 11, 2018, 9:18 PM Uma Chunduri &lt;<a href=
=3D"mailto:umac.ietf@gmail.com">umac.ietf@gmail.com</a>&gt; wrote:<br></div=
><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1=
px #ccc solid;padding-left:1ex"><div dir=3D"ltr">Dear All,<div><br></div><d=
iv><div>Are you aware of any IPR that applies to=C2=A0</div><div><a href=3D=
"https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions-16"=
 target=3D"_blank" rel=3D"noreferrer">https://tools.ietf.org/html/draft-iet=
f-isis-segment-routing-extensions-16</a> ?=C2=A0</div><div><br></div><div>S=
ending this email as suggested by LSR chairs - as this was not noticed duri=
ng/around WGLC.</div><div><br></div><div>=3D=3D=3D</div><div>If so, has thi=
s IPR been disclosed in compliance with IETF IPR rules=C2=A0</div><div>(see=
 RFCs 3979, 4879, 3669 and 5378 for more details).</div><div><br></div><div=
>If you are listed as a document author or contributor please respond</div>=
<div>to this email regardless of whether or not you are aware of any</div><=
div>relevant IPR. *The response needs to be sent to the LSR WG mailing</div=
><div>list.* The document will not advance to the next stage until a</div><=
div>response has been received from each author and contributor.</div><div>=
<br></div><div>If you are on the LSR WG email list but are not listed as an=
 author or</div><div>contributor, then please explicitly respond only if yo=
u are aware of</div><div>any IPR that has not yet been disclosed in conform=
ance with IETF rules.</div></div><div>=3D=3D=3D</div><div><br></div><div>--=
</div><div>Uma C.</div></div>
_______________________________________________<br>
Lsr mailing list<br>
<a href=3D"mailto:Lsr@ietf.org" target=3D"_blank" rel=3D"noreferrer">Lsr@ie=
tf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/lsr" rel=3D"noreferrer nor=
eferrer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/lsr</a><br=
>
</blockquote></div></div></div>

--000000000000dc8830056e6cc133--


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From: "Van De Velde, Gunter (Nokia - BE/Antwerp)" <gunter.van_de_velde@nokia.com>
To: "idr@ietf.org" <idr@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: Signalling ERLD (ISIS, OSPF and BGP-LS)
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/H7QR__iJ0tFR4V_i_Gc67vyDejE>
Subject: [Lsr] Signalling ERLD (ISIS, OSPF and BGP-LS)
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In LSR WG the following drafts document the signaling of ELC and RLD:
* draft-ietf-ospf-mpls-elc
* draft-ietf-isis-mpls-elc

When exporting this information using BGP-LS encoding to a controller, ther=
e is need for BGP-LS extension by means of new TLVs.

BGP-LS is signaling ERLD (entropy capable readable label depth)
ISIS/OSPF is signaling individually ELC and RLD

I was working upon the IANA section, and discovered some inconsistency that=
 should be addressed:
* Why is IGP signaling individual ELC and RLD? ERLD is what was decided upo=
n (https://tools.ietf.org/html/draft-ietf-mpls-spring-entropy-label-10)
* What are the plans to request IANA code points for these drafts?
* (E)RLD seems to have meaning only from NODE perspective, (I assume that L=
INK ERLD is not of any value at all, is that a correct assumption?)

G/


-----Original Message-----
From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of internet-drafts@ietf.o=
rg
Sent: Tuesday, June 12, 2018 15:25
To: i-d-announce@ietf.org
Cc: idr@ietf.org
Subject: [Idr] I-D Action: draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt


A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : Signalling ERLD using BGP-LS
        Authors         : Gunter Van de Velde
                          Wim Henderickx
                          Matthew Bocci
                          Keyur Patel
	Filename        : draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt
	Pages           : 6
	Date            : 2018-06-12

Abstract:
   This document defines the attribute encoding to use for BGP-LS to
   expose ERLD "Entropy capable Readable Label Depth" from a node to a
   centralised controller (PCE/SDN).



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-rld/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-rld-02
https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-ls-segment-routing=
-rld-02

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-idr-bgp-ls-segment-routing-r=
ld-02


Please note that it may take a couple of minutes from the time of submissio=
n 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: Jeff Tantsura <jefftant@gmail.com>
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Date: Tue, 12 Jun 2018 10:14:57 -0700
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Cc: "lsr@ietf.org" <lsr@ietf.org>, "draft-ietf-isis-segment-routing-extensions@ietf.org" <draft-ietf-isis-segment-routing-extensions@ietf.org>,  Les Ginsberg <ginsberg@cisco.com>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>, "lsr-ads@ietf.org" <lsr-ads@ietf.org>
To: Uma Chunduri <umac.ietf@gmail.com>
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Subject: Re: [Lsr] draft-ietf-isis-segment-routing-extensions-16 - Shepherd review comments
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	charset=utf-8

Uma,

Wrt number of authors, if I recall correctly (I don=E2=80=99t have =
pointers to the discussion anymore), given the lengths and involvement =
of the authors currently on the front page, as an exception - both ospf =
and isis sr drafts would keep the initial number of authors.

Thanks,
Jeff

> On Jun 11, 2018, at 22:05, Les Ginsberg (ginsberg) =
<ginsberg@cisco.com> wrote:
>=20
> Uma =E2=80=93
> =20
> One item I forgot=E2=80=A6there are no meaningful nits.
> Idnits reports:
> =20
> -- Looks like a reference, but probably isn't: '100' on line 1009
>      'SRGB =3D [100, 199]...'
> =20
>   -- Looks like a reference, but probably isn't: '199' on line 1009
>      'SRGB =3D [100, 199]...'
> =20
>   -- Looks like a reference, but probably isn't: '1000' on line 1010
>      '[1000, 1099]...'
> =20
>   -- Looks like a reference, but probably isn't: '1099' on line 1010
>      '[1000, 1099]...'
> =20
>   -- Looks like a reference, but probably isn't: '500' on line 1011
>      '[500, 599]...'
> =20
>   -- Looks like a reference, but probably isn't: '599' on line 1011
>      '[500, 599]...'
> =20
>   -- Possible downref: Non-RFC (?) normative reference: ref. =
'ISO10589'
> =20
> The fact that idnits looks at everything enclosed in [] as a reference =
does not mean the text requires revision.
> Idnits also does not allow that a non-RFC document can be a normative =
reference =E2=80=93 but clearly ISO 10589 is a normative reference.

[jeff] indeed, we have used variety of non-RFC documents as normative =
references in the past, this should be acceptable in this case.
> =20
> Thanx.
> =20
>    Les
> =20
> =20
> From: Les Ginsberg (ginsberg)=20
> Sent: Monday, June 11, 2018 10:00 PM
> To: Uma Chunduri <umac.ietf@gmail.com <mailto:umac.ietf@gmail.com>>; =
lsr@ietf.org <mailto:lsr@ietf.org>
> Cc: draft-ietf-isis-segment-routing-extensions@ietf.org =
<mailto:draft-ietf-isis-segment-routing-extensions@ietf.org>; =
lsr-chairs@ietf.org <mailto:lsr-chairs@ietf.org>; lsr-ads@ietf.org =
<mailto:lsr-ads@ietf.org>
> Subject: RE: draft-ietf-isis-segment-routing-extensions-16 - Shepherd =
review comments
> =20
> Uma =E2=80=93
> =20
> Thanx for the prompt review.
> =20
> I have attached proposed diffs to address some of your comments.
> =20
> Additional responses inline.
> =20
> =20
> From: Uma Chunduri <umac.ietf@gmail.com <mailto:umac.ietf@gmail.com>>=20=

> Sent: Monday, June 11, 2018 6:27 PM
> To: lsr@ietf.org <mailto:lsr@ietf.org>
> Cc: draft-ietf-isis-segment-routing-extensions@ietf.org =
<mailto:draft-ietf-isis-segment-routing-extensions@ietf.org>; =
lsr-chairs@ietf.org <mailto:lsr-chairs@ietf.org>; lsr-ads@ietf.org =
<mailto:lsr-ads@ietf.org>
> Subject: draft-ietf-isis-segment-routing-extensions-16 - Shepherd =
review comments
> =20
> Dear Authors,
> =20
> I have done shepherd  review of  =
draft-ietf-isis-segment-routing-extensions-16 document as requested by =
LSR chairs. First, I would like to thank all the the authors and =
contributors on this document.
> I have few minor comments below  and would be great if authors take a =
look at these.
> =20
> =20
> =3D=3D=3D=3D=3D
> =20
> A. I see few ID nits (comments and warnings). Please fix  those.
> B. For the record: (as this would come up soon) : Currently there are =
8  front page authors and please indicate why this document should be =
given exception w.r.t 5 co-authors norm, that is being followed in =
general.
> =20
> [Les:] This will be addressed after discussion among the authors =E2=80=93=
 thanx for the reminder. J
> =20
> 1. Abstract & Section 1
> =20
> a.
>    "These segments are   advertised by the link-state routing =
protocols (IS-IS and OSPF)."
> =20
>    I see more than LSR protocols e.g. =
https://tools.ietf.org/html/draft-ietf-idr-bgp-prefix-sid-07 =
<https://tools.ietf.org/html/draft-ietf-idr-bgp-prefix-sid-07>
>    Also not sure if this statement is necessary. Please either correct =
or remove this.
> =20
> [Les:] The abstract and introduction state =E2=80=9Cwithin IGP =
topologies=E2=80=9D.  In that context I believe limiting the protocols =
mentioned to IGPs is appropriate.
> =20
> b.
>    "Two    types of segments are defined, Prefix segments and =
Adjacency   segments."
> =20
>    This document defines more than these two if you include Section =
2.4 (SID/Label Binding TLV). Section 2 is much better
>    where all types in this document are described as well as   =
[I-D.ietf-spring-segment-routing] is referred for other types.
>    In that sense the above statement looks incomplete/repetitive.
> =20
> [Les:] I have revised the text in this section =E2=80=93 see attached =
diffs.
> =20
>  2. Section 2.1
> =20
> a. "The 'Prefix SID' MUST   be unique within a given IGP domain (when =
the L-flag is not set)."
> =20
>    I see this is conflicting with what's been defined in =
https://tools.ietf.org/html/draft-ietf-spring-segment-routing-14 =
<https://tools.ietf.org/html/draft-ietf-spring-segment-routing-14>,
> section 3.3 -
>    "Within an anycast group, all routers in an SR domain MUST =
advertise  the same prefix with the same SID value."
> =20
>    If you see otherwise please explain why?
> =20
> [Les:] This is a misunderstanding on your part.
> An anycast prefix may be advertised by multiple nodes, but the Prefix =
SID associated with the prefix is the same regardless of which node =
advertises it. So there is no contradiction/conflict here.
> =20
> =20
> b. "A 4 octet index defining.."
> What happens  to the computed label value if the index is of 4 octets =
value? I am asking this as index can have 4 octets but the eventual =
label (SRGB offset + index) would be only 20 bits.=20
> Can you point (if any)  references to =
https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls =
<https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls> =
appropriate sections -  is this is addressed there?
> =20
> [Les:] See =
https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls-14#sect=
ion-2.4 =
<https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls-14#sec=
tion-2.4> (emphasis added):
> =20
> =E2=80=9C 0 =3D< I < size. If the index "I" does not satisfy the =
previous
>       inequality, then the label cannot be calculated.=E2=80=9D
> =20
> c. "A Prefix-SID sub-TLV is associated to a prefix advertised by a =
node    and MAY be present in any of the following TLVs:"
> =20
>      Nit: Perhaps the list should include Section 2.5 too.
> [Les:] Added a reference to 2.5 as well. See attached diffs. Thanx.
> =20
> 3. Section 2.2.1
>   =20
> a. "F-Flag: Address-Family flag..."
> =20
>      Not sure why this has to do with encapsulation? What happens if =
native IPv4/IPv6 data packet is using this SID with out any =
encapsulation? Could you please clarify.
> =20
> [Les:] When the packet is forwarded over the specified outgoing =
interface it will either have an IPv4 encapsulation or an IPv6 =
encapsulation i.e., the payload is encapsulated in the afi specific L3 =
protocol.=20
> This does not mean that a new AFI specific header is imposed.
>  =20
> 4. Section 2.2.2
> =20
> a. Nit: V and L flags: Content is duplicated and perhaps it can =
instead refer to section 2.2.1
> =20
> =20
> [Les:] The text says:
> =E2=80=9C where F, B, V, L, S and P flags are defined in Section =
2.2.1.=E2=80=9D
> =20
> ???
> =20
> =20
> 5. Section 3.2 and Section 2.1
> =20
>     Could you please clarify what is preferred if multiple prefix-sids =
with different algorithm values are advertised for the same SID value?=20=

> =20
> [Les:] There is no =E2=80=9Cpreference=E2=80=9D here. In order to have =
algorithm specific forwarding entries we MUST have different SIDs for =
each algorithm. A router will use the SID which matches the algorithm =
associated with the forwarding entry.
> =20
>      Les
> =20
> --
> Uma C.


--Apple-Mail=_07490A6F-177E-4ACF-914B-655D3665D354
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html;
	charset=utf-8

<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"">Uma,<div class=3D""><br class=3D""></div><div class=3D"">Wrt =
number of authors, if I recall correctly (I don=E2=80=99t have pointers =
to the discussion anymore), given the lengths and involvement of the =
authors currently on the front page, as an exception - both ospf and =
isis sr drafts would keep the initial number of authors.</div><div =
class=3D""><br class=3D""></div><div class=3D"">Thanks,</div><div =
class=3D"">Jeff</div><div class=3D""><div><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D"">On Jun 11, 2018, at 22:05, Les =
Ginsberg (ginsberg) &lt;<a href=3D"mailto:ginsberg@cisco.com" =
class=3D"">ginsberg@cisco.com</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; font-family: =
Helvetica; font-size: 12px; 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;"><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D"">Uma=
 =E2=80=93<o:p class=3D""></o:p></span></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">One item I =
forgot=E2=80=A6there are no meaningful nits.<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">Idnits reports:<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">-- Looks like a =
reference, but probably isn't: '100' on line 1009<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">&nbsp;&nbsp;&nbsp;&nbsp; =
'SRGB =3D [100, 199]...'<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp; -- Looks like a reference, but probably isn't: '199' =
on line 1009<o:p class=3D""></o:p></span></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">&nbsp;&nbsp;&nbsp;&nbsp; =
'SRGB =3D [100, 199]...'<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp; -- Looks like a reference, but probably isn't: '1000' =
on line 1010<o:p class=3D""></o:p></span></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">&nbsp;&nbsp;&nbsp;&nbsp; =
'[1000, 1099]...'<o:p class=3D""></o:p></span></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp; -- Looks like a reference, but probably isn't: '1099' =
on line 1010<o:p class=3D""></o:p></span></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">&nbsp;&nbsp;&nbsp;&nbsp; =
'[1000, 1099]...'<o:p class=3D""></o:p></span></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp; -- Looks like a reference, but probably isn't: '500' =
on line 1011<o:p class=3D""></o:p></span></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">&nbsp;&nbsp;&nbsp;&nbsp; =
'[500, 599]...'<o:p class=3D""></o:p></span></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp; -- Looks like a reference, but probably isn't: '599' =
on line 1011<o:p class=3D""></o:p></span></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">&nbsp;&nbsp;&nbsp;&nbsp; =
'[500, 599]...'<o:p class=3D""></o:p></span></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp; -- Possible downref: Non-RFC (?) normative reference: =
ref. 'ISO10589'<o:p class=3D""></o:p></span></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D"">The=
 fact that idnits looks at everything enclosed in [] as a reference does =
not mean the text requires revision.<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">Idnits also does not =
allow that a non-RFC document can be a normative reference =E2=80=93 but =
clearly ISO 10589 is a normative =
reference.</span></div></div></div></blockquote><br class=3D"">[jeff] =
indeed, we have used variety of non-RFC documents as&nbsp;normative =
references in the past, this should be acceptable in this case.<br =
class=3D""><blockquote type=3D"cite" class=3D""><div class=3D""><div =
class=3D"WordSection1" style=3D"page: WordSection1; font-family: =
Helvetica; font-size: 12px; 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;"><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D""><o:p class=3D""></o:p></span></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">Thanx.<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">&nbsp;&nbsp; Les<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"border-style: none =
none none solid; border-left-width: 1.5pt; border-left-color: blue; =
padding: 0in 0in 0in 4pt;" class=3D""><div class=3D""><div =
style=3D"border-style: solid none none; border-top-width: 1pt; =
border-top-color: rgb(225, 225, 225); padding: 3pt 0in 0in;" =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><b =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">From:</span></b><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span>Les Ginsberg =
(ginsberg)<span class=3D"Apple-converted-space">&nbsp;</span><br =
class=3D""><b class=3D"">Sent:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Monday, June 11, 2018 10:00 =
PM<br class=3D""><b class=3D"">To:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Uma Chunduri &lt;<a =
href=3D"mailto:umac.ietf@gmail.com" style=3D"color: purple; =
text-decoration: underline;" class=3D"">umac.ietf@gmail.com</a>&gt;;<span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:lsr@ietf.org" style=3D"color: purple; text-decoration: =
underline;" class=3D"">lsr@ietf.org</a><br class=3D""><b =
class=3D"">Cc:</b><span class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:draft-ietf-isis-segment-routing-extensions@ietf.org" =
style=3D"color: purple; text-decoration: underline;" =
class=3D"">draft-ietf-isis-segment-routing-extensions@ietf.org</a>;<span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:lsr-chairs@ietf.org" style=3D"color: purple; =
text-decoration: underline;" class=3D"">lsr-chairs@ietf.org</a>;<span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:lsr-ads@ietf.org" style=3D"color: purple; =
text-decoration: underline;" class=3D"">lsr-ads@ietf.org</a><br =
class=3D""><b class=3D"">Subject:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>RE: =
draft-ietf-isis-segment-routing-extensions-16 - Shepherd review =
comments<o:p class=3D""></o:p></span></div></div></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">Uma =E2=80=93<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">Thanx for the prompt =
review.<o:p class=3D""></o:p></span></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">I have attached =
proposed diffs to address some of your comments.<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">Additional responses =
inline.<o:p class=3D""></o:p></span></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"border-style: none =
none none solid; border-left-width: 1.5pt; border-left-color: blue; =
padding: 0in 0in 0in 4pt;" class=3D""><div class=3D""><div =
style=3D"border-style: solid none none; border-top-width: 1pt; =
border-top-color: rgb(225, 225, 225); padding: 3pt 0in 0in;" =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><b =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">From:</span></b><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D""><span =
class=3D"Apple-converted-space">&nbsp;</span>Uma Chunduri &lt;<a =
href=3D"mailto:umac.ietf@gmail.com" style=3D"color: purple; =
text-decoration: underline;" class=3D"">umac.ietf@gmail.com</a>&gt;<span =
class=3D"Apple-converted-space">&nbsp;</span><br class=3D""><b =
class=3D"">Sent:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>Monday, June 11, 2018 6:27 =
PM<br class=3D""><b class=3D"">To:</b><span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:lsr@ietf.org" style=3D"color: purple; text-decoration: =
underline;" class=3D"">lsr@ietf.org</a><br class=3D""><b =
class=3D"">Cc:</b><span class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:draft-ietf-isis-segment-routing-extensions@ietf.org" =
style=3D"color: purple; text-decoration: underline;" =
class=3D"">draft-ietf-isis-segment-routing-extensions@ietf.org</a>;<span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:lsr-chairs@ietf.org" style=3D"color: purple; =
text-decoration: underline;" class=3D"">lsr-chairs@ietf.org</a>;<span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"mailto:lsr-ads@ietf.org" style=3D"color: purple; =
text-decoration: underline;" class=3D"">lsr-ads@ietf.org</a><br =
class=3D""><b class=3D"">Subject:</b><span =
class=3D"Apple-converted-space">&nbsp;</span>draft-ietf-isis-segment-routi=
ng-extensions-16 - Shepherd review comments<o:p =
class=3D""></o:p></span></div></div></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D"">Dear Authors,<o:p =
class=3D""></o:p></div><div class=3D""><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D"">I have done =
shepherd&nbsp; review =
of&nbsp;&nbsp;draft-ietf-isis-segment-routing-extensions-16 document as =
requested by LSR chairs.&nbsp;First, I would like to thank all the the =
authors and contributors on this document.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D"">I have few minor comments below&nbsp; and would be =
great if authors take a look at these.<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></div></div><div =
class=3D""><div style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; =
font-family: &quot;Times New Roman&quot;, serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">=3D=3D=3D=3D=3D<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif;" class=3D"">A. I see few ID nits =
(comments and warnings). Please fix&nbsp; those.<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">B. For the record: (as this would come up soon) =
: Currently there are 8&nbsp; front page authors and please indicate why =
this document should be given exception w.r.t 5 co-authors norm, that is =
being followed in general.<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><b class=3D""><i class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">[Les:] This will be addressed after =
discussion among the authors =E2=80=93 thanx for the reminder.<span =
class=3D"Apple-converted-space">&nbsp;</span></span></i></b><b =
class=3D""><i class=3D""><span style=3D"font-size: 11pt; font-family: =
Wingdings; color: rgb(31, 73, 125);" class=3D"">J</span></i></b><b =
class=3D""><i class=3D""><span style=3D"font-size: 11pt; font-family: =
Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D""><o:p =
class=3D""></o:p></span></i></b></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">1. Abstract &amp; Section 1<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">&nbsp;<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif;" class=3D"">a.<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">&nbsp;&nbsp; "These segments are =
&nbsp;&nbsp;advertised by the link-state routing protocols (IS-IS and =
OSPF)."<o:p class=3D""></o:p></span></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">&nbsp;<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif;" class=3D"">&nbsp;&nbsp; I see =
more than LSR protocols e.g.<span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"https://tools.ietf.org/html/draft-ietf-idr-bgp-prefix-sid-07" =
style=3D"color: purple; text-decoration: underline;" =
class=3D"">https://tools.ietf.org/html/draft-ietf-idr-bgp-prefix-sid-07</a=
><o:p class=3D""></o:p></span></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">&nbsp;&nbsp; Also not sure if this statement is =
necessary. Please either correct or remove this.<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">&nbsp;<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><b class=3D""><i =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">[Les:] The abstract and =
introduction state =E2=80=9Cwithin IGP topologies=E2=80=9D. &nbsp;In =
that context I believe limiting the protocols mentioned to IGPs is =
appropriate.<o:p class=3D""></o:p></span></i></b></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">b.<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">&nbsp;&nbsp; "Two &nbsp;&nbsp;&nbsp;types of =
segments are defined, Prefix segments and Adjacency =
&nbsp;&nbsp;segments."<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">&nbsp;&nbsp; This document defines more than =
these two if you include Section 2.4 (SID/Label Binding TLV). Section 2 =
is much better<o:p class=3D""></o:p></span></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">&nbsp;&nbsp; where all =
types in this document are described as well as&nbsp;&nbsp; =
[I-D.ietf-spring-segment-routing] is referred for other types.<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">&nbsp;&nbsp; In that sense the above statement =
looks incomplete/repetitive.<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><b class=3D""><i class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">[Les:] I have revised the text in this section =E2=80=93 see =
attached diffs.<o:p class=3D""></o:p></span></i></b></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">&nbsp;2. Section 2.1<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">&nbsp;<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif;" class=3D"">a. "The 'Prefix SID' =
MUST &nbsp;&nbsp;be unique within a given IGP domain (when the L-flag is =
not set)."<o:p class=3D""></o:p></span></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">&nbsp;<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif;" class=3D"">&nbsp;&nbsp; I see =
this is conflicting with what's been defined in<span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-14" =
style=3D"color: purple; text-decoration: underline;" =
class=3D"">https://tools.ietf.org/html/draft-ietf-spring-segment-routing-1=
4</a>,<o:p class=3D""></o:p></span></div><div style=3D"margin: 0in 0in =
0.0001pt 0.5in; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">section 3.3 -<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt =
0.5in; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">&nbsp;&nbsp; "Within an anycast group, all =
routers in an SR domain MUST advertise&nbsp;&nbsp;the same prefix with =
the same SID value."<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif;" class=3D"">&nbsp;<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">&nbsp; &nbsp;If you see otherwise please explain =
why?<o:p class=3D""></o:p></span></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">&nbsp;<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><b class=3D""><i =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">[Les:] This is a =
misunderstanding on your part.<o:p =
class=3D""></o:p></span></i></b></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><b class=3D""><i class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">An anycast prefix may be advertised by multiple nodes, but =
the Prefix SID associated with the prefix is the same regardless of =
which node advertises it. So there is no contradiction/conflict =
here.<o:p class=3D""></o:p></span></i></b></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><b class=3D""><i class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></i></b></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">b. "A 4 octet index defining.."<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif; =
text-indent: 9pt;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">What happens&nbsp; to the =
computed label value if the index is of 4 octets value? I am asking this =
as index can have 4 octets but the eventual label (SRGB offset + index) =
would be only 20 bits.<span =
class=3D"Apple-converted-space">&nbsp;</span><o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif; =
text-indent: 9pt;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">Can you point (if =
any)&nbsp; references to<span =
class=3D"Apple-converted-space">&nbsp;</span><a =
href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls=
" style=3D"color: purple; text-decoration: underline;" =
class=3D"">https://tools.ietf.org/html/draft-ietf-spring-segment-routing-m=
pls</a><span class=3D"Apple-converted-space">&nbsp;</span>appropriate =
sections -&nbsp; is this is addressed there?<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><b class=3D""><i class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">[Les:] See<span class=3D"Apple-converted-space">&nbsp;</span><a=
 =
href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls=
-14#section-2.4" style=3D"color: purple; text-decoration: underline;" =
class=3D"">https://tools.ietf.org/html/draft-ietf-spring-segment-routing-m=
pls-14#section-2.4</a><span =
class=3D"Apple-converted-space">&nbsp;</span>(emphasis added):<o:p =
class=3D""></o:p></span></i></b></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><b class=3D""><i class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></i></b></div><div =
style=3D"margin: 0in 0in 0.0001pt 5.25pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><b class=3D""><i =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">=E2=80=9C 0 =3D&lt; I =
&lt; size. If the index "I" does not satisfy the previous<o:p =
class=3D""></o:p></span></i></b></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><b class=3D""><i class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; inequality,<span =
class=3D"Apple-converted-space">&nbsp;</span></span></i></b><b =
class=3D""><i class=3D""><span style=3D"font-size: 11pt; font-family: =
Calibri, sans-serif; color: red;" class=3D"">then the label cannot be =
calculated</span></i></b><b class=3D""><i class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">.=E2=80=9D<o:p =
class=3D""></o:p></span></i></b></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">&nbsp;<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif;" class=3D"">c. "A Prefix-SID =
sub-TLV is associated to a prefix advertised by a node =
&nbsp;&nbsp;&nbsp;and MAY be present in any of the following TLVs:"<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">&nbsp;<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif;" class=3D"">&nbsp; =
&nbsp;&nbsp;&nbsp;Nit: Perhaps the list should include Section 2.5 =
too.<o:p class=3D""></o:p></span></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><b class=3D""><i class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">[Les:] Added a reference to 2.5 as well. See attached diffs. =
Thanx.</span></i></b><span style=3D"font-size: 11pt; font-family: =
Calibri, sans-serif; color: rgb(31, 73, 125);" class=3D""><o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">&nbsp;<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif;" class=3D"">3. Section 2.2.1<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">&nbsp;&nbsp;&nbsp;<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">a. "F-Flag: Address-Family flag..."<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">&nbsp;<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif;" =
class=3D"">&nbsp;&nbsp;&nbsp;&nbsp; Not sure why this has to do with =
encapsulation? What happens if native IPv4/IPv6 data packet is using =
this SID with out any encapsulation? Could you please clarify.<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><b class=3D""><i class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">[Les:] When the packet is forwarded over the specified =
outgoing interface it will either have an IPv4 encapsulation or an IPv6 =
encapsulation i.e., the payload is encapsulated in the afi specific L3 =
protocol.<span class=3D"Apple-converted-space">&nbsp;</span><o:p =
class=3D""></o:p></span></i></b></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><b class=3D""><i class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">This does not mean that a new AFI specific header is =
imposed.<o:p class=3D""></o:p></span></i></b></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><span style=3D"font-size: 11pt; =
font-family: Calibri, sans-serif;" class=3D"">&nbsp;&nbsp;<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">4. Section 2.2.2<o:p =
class=3D""></o:p></span></div><div style=3D"margin: 0in 0in 0.0001pt; =
font-size: 12pt; font-family: &quot;Times New Roman&quot;, serif;" =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif;" class=3D"">&nbsp;<o:p class=3D""></o:p></span></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif;" class=3D"">a. Nit: V and L =
flags: Content is duplicated and perhaps it can instead refer to section =
2.2.1<o:p class=3D""></o:p></span></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"color: rgb(31, 73, 125);" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><b class=3D""><i class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">[Les:] The text says:<o:p =
class=3D""></o:p></span></i></b></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><b class=3D""><i class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">=E2=80=9C where F, B, V, L, S and P flags are defined in =
Section 2.2.1.=E2=80=9D<o:p class=3D""></o:p></span></i></b></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><b class=3D""><i =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></i></b></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><b class=3D""><i class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D"">???<o:p class=3D""></o:p></span></i></b></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><b class=3D""><i =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></i></b></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D""><o:p =
class=3D"">&nbsp;</o:p></span></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D"">5. Section 3.2 and =
Section 2.1<o:p class=3D""></o:p></div></div><div class=3D""><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><o:p =
class=3D"">&nbsp;</o:p></div></div><div class=3D""><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D"">&nbsp; &nbsp; Could you please clarify =
what is preferred if multiple prefix-sids with different algorithm =
values are advertised for the same SID value?&nbsp;<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><span style=3D"color: rgb(31, 73, 125);" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></div><div style=3D"margin: =
0in 0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New =
Roman&quot;, serif;" class=3D""><b class=3D""><i class=3D""><span =
style=3D"font-size: 11pt; font-family: Calibri, sans-serif; color: =
rgb(31, 73, 125);" class=3D"">[Les:] There is no =E2=80=9Cpreference=E2=80=
=9D here. In order to have algorithm specific forwarding entries we MUST =
have different SIDs for each algorithm. A router will use the SID which =
matches the algorithm associated with the forwarding entry.<o:p =
class=3D""></o:p></span></i></b></div><div style=3D"margin: 0in 0in =
0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><b class=3D""><i class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></i></b></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D""><b class=3D""><i =
class=3D""><span style=3D"font-size: 11pt; font-family: Calibri, =
sans-serif; color: rgb(31, 73, 125);" class=3D"">&nbsp;&nbsp;&nbsp;&nbsp; =
Les<o:p class=3D""></o:p></span></i></b></div><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D""><b class=3D""><i class=3D""><span style=3D"font-size: =
11pt; font-family: Calibri, sans-serif; color: rgb(31, 73, 125);" =
class=3D""><o:p class=3D"">&nbsp;</o:p></span></i></b></div><div =
style=3D"margin: 0in 0in 0.0001pt; font-size: 12pt; font-family: =
&quot;Times New Roman&quot;, serif;" class=3D"">--<o:p =
class=3D""></o:p></div></div><div class=3D""><div style=3D"margin: 0in =
0in 0.0001pt; font-size: 12pt; font-family: &quot;Times New Roman&quot;, =
serif;" class=3D"">Uma C.<o:p =
class=3D""></o:p></div></div></div></div></div></div></div></blockquote></=
div><br class=3D""></div></body></html>=

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From: Uma Chunduri <umac.ietf@gmail.com>
Date: Tue, 12 Jun 2018 11:08:50 -0700
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To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
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Subject: Re: [Lsr] draft-ietf-isis-segment-routing-extensions-16 - Shepherd review comments
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Les,

Thanks for your quick response and changes in the document. Please find my
further response below* [Uma]:*

--
Uma C.

On Mon, Jun 11, 2018 at 10:00 PM, Les Ginsberg (ginsberg) <
ginsberg@cisco.com> wrote:

> Uma =E2=80=93
>
>
>
> Thanx for the prompt review.
>
>
>
>  2. Section 2.1
>
>
>
> a. "The 'Prefix SID' MUST   be unique within a given IGP domain (when the
> L-flag is not set)."
>
>
>
>    I see this is conflicting with what's been defined in
> https://tools.ietf.org/html/draft-ietf-spring-segment-routing-14,
>
> section 3.3 -
>
>    "Within an anycast group, all routers in an SR domain MUST
> advertise  the same prefix with the same SID value."
>
>
>
>    If you see otherwise please explain why?
>
>
>
> *[Les:] This is a misunderstanding on your part.*
>
> *An anycast prefix may be advertised by multiple nodes, but the Prefix SI=
D
> associated with the prefix is the same regardless of which node advertise=
s
> it. So there is no contradiction/conflict here.*
>
>
>

*[Uma]:  I understood the intention.*

*This doc says - "The 'Prefix SID' MUST   be unique within a given IGP
domain (when the L-flag is not set)." *
*And it won't give any exception for "anycast group" either in the text or
through reference to  draft-ietf-spring-segment-routing-14
<https://tools.ietf.org/html/draft-ietf-spring-segment-routing-14>.*



>
>
> b. "A 4 octet index defining.."
>
> What happens  to the computed label value if the index is of 4 octets
> value? I am asking this as index can have 4 octets but the eventual label
> (SRGB offset + index) would be only 20 bits.
>
> Can you point (if any)  references to https://tools.ietf.org/html/
> draft-ietf-spring-segment-routing-mpls appropriate sections -  is this is
> addressed there?
>
>
>
> *[Les:] See
> https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls-14#sec=
tion-2.4
> <https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls-14#se=
ction-2.4>
> (emphasis added):*
>
>
>
> *=E2=80=9C 0 =3D< I < size. If the index "I" does not satisfy the previou=
s*
>
> *      inequality, **then the label cannot be calculated**.=E2=80=9D*
>

*[Uma]: Thanks for the pointer. I am fine with keeping this at a common
place but this document  needs a generic reference specifically for some of
the conflict/error conditions to that.*


>
>
> 3. Section 2.2.1
>
>
>
> a. "F-Flag: Address-Family flag..."
>
>
>
>      Not sure why this has to do with encapsulation? What happens if
> native IPv4/IPv6 data packet is using this SID with out any encapsulation=
?
> Could you please clarify.
>
>
>
> *[Les:] When the packet is forwarded over the specified outgoing interfac=
e
> it will either have an IPv4 encapsulation or an IPv6 encapsulation i.e.,
> the payload is encapsulated in the afi specific L3 protocol. *
>
> *This does not mean that a new AFI specific header is imposed.*
>
>
>

*[Uma]: Thanks.  I didn't expect payload encapsulation with L3 in IS-IS
document. I see this is derived from the base TLV where this sub-TLV
belongs to (22/222/223 etc.). This sounded like additional encap and hence
my comment.*

*But one of my larger point here is why a sub-TLV has to specify/define AF.
This is the property of the associated TLV/MT-aware TLV.*
*I understand this could be too late to change here but this additional
information should not conflict with base while usage. *
*One incorrect usage *example* of this sub-TLV with AF unset (IPv4) in TLV
222 with MT-ID=3D2 (IPv6).*

*As it stands this combinations valid/allowed. Perhaps some text around
this would be helpful.*



> 4. Section 2.2.2
>
>
>
> a. Nit: V and L flags: Content is duplicated and perhaps it can instead
> refer to section 2.2.1
>
>
>
>
>
> *[Les:] The text says:*
>
> *=E2=80=9C where F, B, V, L, S and P flags are defined in Section 2.2.1.=
=E2=80=9D*
>
>
>
> *???*
>

*[Uma]: Sorry - I should have been more specific. Was referring to
duplicated text in Section 2.2.1 and 2.2.2*

 "

      *  A 3 octet local label where the 20 rightmost bits are used for
         encoding the label value.  In this case the V and L flags MUST
         be set.

      *  A 4 octet index defining the offset in the SID/Label space
         advertised by this router using the encodings defined in
         Section 3.1
<https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions-16#=
section-3.1>.
In this case V and L flags MUST be unset."



>
>
>
> 5. Section 3.2 and Section 2.1
>
>
>
>     Could you please clarify what is preferred if multiple prefix-sids
> with different algorithm values are advertised for the same SID value?
>
>
>
> *[Les:] There is no =E2=80=9Cpreference=E2=80=9D here. In order to have a=
lgorithm specific
> forwarding entries we MUST have different SIDs for each algorithm. A rout=
er
> will use the SID which matches the algorithm associated with the forwardi=
ng
> entry.*
>

*[Uma]: ..and IMO, this should be specified. *

--00000000000024682a056e75c278
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Les,<div><br></div><div>Thanks for your quick response and=
 changes in the document. Please find my further response below<b> [Uma]:</=
b></div><div><br></div><div>--</div><div>Uma C.</div><div class=3D"gmail_ex=
tra"><br><div class=3D"gmail_quote">On Mon, Jun 11, 2018 at 10:00 PM, Les G=
insberg (ginsberg) <span dir=3D"ltr">&lt;<a href=3D"mailto:ginsberg@cisco.c=
om" target=3D"_blank">ginsberg@cisco.com</a>&gt;</span> wrote:<br><blockquo=
te class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc so=
lid;padding-left:1ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"m_7533432596314035793WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Uma =E2=80=93<u></u><u></u></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Thanx for the prompt review.<u></u><u=
></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt"><div><div><span class=3D""><p class=3D"MsoNormal"><span style=3D"fon=
t-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">=C2=A02. Section =
2.1<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">a. &quot;The &#39;Prefix SID&#39; MUST =C2=A0=C2=A0=
be unique within a given IGP domain (when the L-flag is not set).&quot;<u><=
/u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">=C2=A0=C2=A0 I see this is conflicting with what&#3=
9;s been defined in
<a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-14=
" target=3D"_blank">https://tools.ietf.org/html/<wbr>draft-ietf-spring-segm=
ent-<wbr>routing-14</a>,
<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
11.0pt;font-family:&quot;Calibri&quot;,sans-serif">section 3.3 -<u></u><u><=
/u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in"><span style=3D"font-size:=
11.0pt;font-family:&quot;Calibri&quot;,sans-serif">=C2=A0=C2=A0 &quot;Withi=
n an anycast group, all routers in an SR domain MUST advertise=C2=A0=C2=A0t=
he same prefix with the same SID value.&quot;<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">=C2=A0 =C2=A0If you see otherwise please explain wh=
y?<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">=C2=A0<u></u><u></u></span></p>
</span><p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-fa=
mily:&quot;Calibri&quot;,sans-serif;color:#1f497d">[Les:] This is a misunde=
rstanding on your part.<u></u><u></u></span></i></b></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">An anycast prefix may be advert=
ised by multiple nodes, but the Prefix SID associated with the prefix is th=
e same regardless of which node advertises it.
 So there is no contradiction/conflict here.<u></u><u></u></span></i></b></=
p><span class=3D"">
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0</span></i></b></p=
></span></div></div></div></div></div></blockquote><div>=C2=A0</div><div><b=
>[Uma]:=C2=A0 I understood the intention.</b></div><div><b><br></b></div><d=
iv><b>This doc says -=C2=A0<span style=3D"font-family:Calibri,sans-serif;fo=
nt-size:14.6667px;background-color:rgb(255,255,255);text-decoration-style:i=
nitial;text-decoration-color:initial;float:none;display:inline">&quot;The &=
#39;Prefix SID&#39; MUST =C2=A0=C2=A0be unique within a given IGP domain (w=
hen the L-flag is not set).&quot;=C2=A0</span></b></div><div><span style=3D=
"font-family:Calibri,sans-serif;font-size:14.6667px;background-color:rgb(25=
5,255,255);text-decoration-style:initial;text-decoration-color:initial;floa=
t:none;display:inline"><b>And it won&#39;t give any exception for &quot;any=
cast group&quot; either in the text or through reference to=C2=A0
<a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-14=
" target=3D"_blank" style=3D"color:rgb(17,85,204)">draft-ietf-spring-segmen=
t-<wbr>routing-14</a>.</b></span></div><div><span style=3D"font-family:Cali=
bri,sans-serif;font-size:14.6667px;background-color:rgb(255,255,255);text-d=
ecoration-style:initial;text-decoration-color:initial;float:none;display:in=
line"><br></span></div><div>=C2=A0</div><blockquote class=3D"gmail_quote" s=
tyle=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div=
 lang=3D"EN-US" link=3D"blue" vlink=3D"purple"><div class=3D"m_753343259631=
4035793WordSection1"><div style=3D"border:none;border-left:solid blue 1.5pt=
;padding:0in 0in 0in 4.0pt"><div><div><span class=3D""><p class=3D"MsoNorma=
l"><b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sa=
ns-serif;color:#1f497d"><u></u></span></i></b></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">b. &quot;A 4 octet index defining..&quot;<u></u><u>=
</u></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:9.0pt"><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">What happens=C2=A0 to t=
he computed label value if the index is of 4 octets value? I am asking this=
 as index can have 4 octets but the eventual label (SRGB
 offset + index) would be only 20 bits. <u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:9.0pt"><span style=3D"font-size=
:11.0pt;font-family:&quot;Calibri&quot;,sans-serif">Can you point (if any)=
=C2=A0 references to
<a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mp=
ls" target=3D"_blank">https://tools.ietf.org/html/<wbr>draft-ietf-spring-se=
gment-<wbr>routing-mpls</a> appropriate sections -=C2=A0 is this is address=
ed there?<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
</span><p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-fa=
mily:&quot;Calibri&quot;,sans-serif;color:#1f497d">[Les:] See
<a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mp=
ls-14#section-2.4" target=3D"_blank">
https://tools.ietf.org/html/<wbr>draft-ietf-spring-segment-<wbr>routing-mpl=
s-14#section-2.4</a> (emphasis added):<u></u><u></u></span></i></b></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></i>=
</b></p>
<p class=3D"MsoNormal" style=3D"margin-left:5.25pt"><b><i><span style=3D"fo=
nt-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">=
=E2=80=9C 0 =3D&lt; I &lt; size. If the index &quot;I&quot; does not satisf=
y the previous<u></u><u></u></span></i></b></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
inequality,
</span></i></b><b><i><span style=3D"font-size:11.0pt;font-family:&quot;Cali=
bri&quot;,sans-serif;color:red">then the label cannot be calculated</span><=
/i></b><b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot=
;,sans-serif;color:#1f497d">.=E2=80=9D</span></i></b></p></div></div></div>=
</div></div></blockquote><div>=C2=A0</div><div><b>[Uma]: Thanks for the poi=
nter. I am fine with keeping this at a common place but this document=C2=A0=
 needs a generic reference specifically for some of the conflict/error cond=
itions to that.</b></div><div>=C2=A0</div><blockquote class=3D"gmail_quote"=
 style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><d=
iv lang=3D"EN-US" link=3D"blue" vlink=3D"purple"><div class=3D"m_7533432596=
314035793WordSection1"><div style=3D"border:none;border-left:solid blue 1.5=
pt;padding:0in 0in 0in 4.0pt"><div><div><p class=3D"MsoNormal"><b><i><span =
style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;color:=
#1f497d"><u></u><u></u></span></i></b></p><span class=3D"">
<p class=3D"MsoNormal"><span style=3D"font-family:Calibri,sans-serif;font-s=
ize:11pt">=C2=A0</span><br></p></span><span class=3D"">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">3. Section 2.2.1<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">=C2=A0=C2=A0=C2=A0
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">a. &quot;F-Flag: Address-Family flag...&quot;
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">=C2=A0=C2=A0=C2=A0=C2=A0 Not sure why this has to d=
o with encapsulation? What happens if native IPv4/IPv6 data packet is using=
 this SID with out any encapsulation? Could you please clarify.<u></u><u></=
u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
</span><p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-fa=
mily:&quot;Calibri&quot;,sans-serif;color:#1f497d">[Les:] When the packet i=
s forwarded over the specified outgoing interface it will either have an IP=
v4 encapsulation or an IPv6 encapsulation i.e., the payload
 is encapsulated in the afi specific L3 protocol. <u></u><u></u></span></i>=
</b></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">This does not mean that a new A=
FI specific header is imposed.<u></u><u></u></span></i></b></p><span class=
=3D"">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">=C2=A0=C2=A0</span></p></span></div></div></div></d=
iv></div></blockquote><div>=C2=A0</div><div><b>[Uma]: Thanks.=C2=A0 I didn&=
#39;t expect payload encapsulation with L3 in IS-IS document. I see this is=
 derived from the base TLV where this sub-TLV belongs to (22/222/223 etc.).=
 This sounded like additional encap and hence my comment.</b></div><div><b>=
<br></b></div><div><b>But one of my larger point here is why a sub-TLV has =
to specify/define AF. This is the property of the associated TLV/MT-aware T=
LV.</b></div><div><b>I understand this could be too late to change here but=
 this additional information should not conflict with base while usage.=C2=
=A0</b></div><div><b>One incorrect usage *example* of this sub-TLV with AF =
unset (IPv4) in TLV 222 with MT-ID=3D2 (IPv6).</b></div><div><b><br></b></d=
iv><div><b>As it stands this combinations valid/allowed. Perhaps some text =
around this would be helpful.</b></div><div><br></div><div>=C2=A0</div><blo=
ckquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #c=
cc solid;padding-left:1ex"><div lang=3D"EN-US" link=3D"blue" vlink=3D"purpl=
e"><div class=3D"m_7533432596314035793WordSection1"><div style=3D"border:no=
ne;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt"><div><div><span =
class=3D""><p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-fami=
ly:&quot;Calibri&quot;,sans-serif"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">4. Section 2.2.2<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">=C2=A0<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">a. Nit: V and L flags: Content is duplicated and pe=
rhaps it can instead refer to section 2.2.1<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1f497d"><u></u>=C2=A0<u></u></=
span></p>
</span><p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-fa=
mily:&quot;Calibri&quot;,sans-serif;color:#1f497d">[Les:] The text says:<u>=
</u><u></u></span></i></b></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">=E2=80=9C where F, B, V, L, S a=
nd P flags are defined in Section 2.2.1.=E2=80=9D<u></u><u></u></span></i><=
/b></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></i>=
</b></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">???</span></i></b></p></div></d=
iv></div></div></div></blockquote><div><br></div><div><b>[Uma]: Sorry - I s=
hould have been more specific. Was referring to duplicated text in Section =
2.2.1 and 2.2.2</b></div><div><br></div><div>=C2=A0&quot;

<pre class=3D"gmail-newpage" style=3D"font-size:13.3333px;margin-top:0px;ma=
rgin-bottom:0px;break-before:page;color:rgb(0,0,0);text-decoration-style:in=
itial;text-decoration-color:initial">      *  A 3 octet local label where t=
he 20 rightmost bits are used for
         encoding the label value.  In this case the V and L flags MUST
         be set.

      *  A 4 octet index defining the offset in the SID/Label space
         advertised by this router using the encodings defined in
         <a href=3D"https://tools.ietf.org/html/draft-ietf-isis-segment-rou=
ting-extensions-16#section-3.1">Section 3.1</a>.  In this case V and L flag=
s MUST be unset.&quot;</pre><pre class=3D"gmail-newpage" style=3D"font-size=
:13.3333px;margin-top:0px;margin-bottom:0px;break-before:page;color:rgb(0,0=
,0);text-decoration-style:initial;text-decoration-color:initial"><br></pre>

</div><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-l=
eft:1px #ccc solid;padding-left:1ex"><div lang=3D"EN-US" link=3D"blue" vlin=
k=3D"purple"><div class=3D"m_7533432596314035793WordSection1"><div style=3D=
"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in 4.0pt"><div><=
div><p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-famil=
y:&quot;Calibri&quot;,sans-serif;color:#1f497d"><u></u><u></u></span></i></=
b></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></i>=
</b></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
</div><span class=3D"">
<div>
<p class=3D"MsoNormal">5. Section 3.2 and Section 2.1<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0 =C2=A0 Could you please clarify what is prefe=
rred if multiple prefix-sids with different algorithm values are advertised=
 for the same SID value?=C2=A0<u></u><u></u></p>
</div>
</span><div>
<p class=3D"MsoNormal"><span style=3D"color:#1f497d"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">[Les:] There is no =E2=80=9Cpre=
ference=E2=80=9D here. In order to have algorithm specific forwarding entri=
es we MUST have different SIDs for each algorithm. A router will
 use the SID which matches the algorithm associated with the forwarding ent=
ry.</span></i></b></p></div></div></div></div></div></blockquote><div><br><=
/div><div><b>[Uma]: ..and IMO, this should be specified.=C2=A0</b></div><di=
v><br></div><div>=C2=A0</div></div></div></div>

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From: Uma Chunduri <umac.ietf@gmail.com>
Date: Tue, 12 Jun 2018 11:13:04 -0700
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To: Jeff Tantsura <jefftant@gmail.com>
Cc: "lsr@ietf.org" <lsr@ietf.org>,  "draft-ietf-isis-segment-routing-extensions@ietf.org" <draft-ietf-isis-segment-routing-extensions@ietf.org>,  Les Ginsberg <ginsberg@cisco.com>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>, "lsr-ads@ietf.org" <lsr-ads@ietf.org>
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Subject: Re: [Lsr] draft-ietf-isis-segment-routing-extensions-16 - Shepherd review comments
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Hi Jeff,

Thanks for your response. I would note the same but this is obviously with
Chairs and responsible AD's discretion.

Hi Les,

Thank you and I am fine here.

--
Uma C.

On Tue, Jun 12, 2018 at 10:14 AM, Jeff Tantsura <jefftant@gmail.com> wrote:

> Uma,
>
> Wrt number of authors, if I recall correctly (I don=E2=80=99t have pointe=
rs to the
> discussion anymore), given the lengths and involvement of the authors
> currently on the front page, as an exception - both ospf and isis sr draf=
ts
> would keep the initial number of authors.
>
> Thanks,
> Jeff
>
> On Jun 11, 2018, at 22:05, Les Ginsberg (ginsberg) <ginsberg@cisco.com>
> wrote:
>
> Uma =E2=80=93
>
> One item I forgot=E2=80=A6there are no meaningful nits.
> Idnits reports:
>
> -- Looks like a reference, but probably isn't: '100' on line 1009
>      'SRGB =3D [100, 199]...'
>
>   -- Looks like a reference, but probably isn't: '199' on line 1009
>      'SRGB =3D [100, 199]...'
>
>   -- Looks like a reference, but probably isn't: '1000' on line 1010
>      '[1000, 1099]...'
>
>   -- Looks like a reference, but probably isn't: '1099' on line 1010
>      '[1000, 1099]...'
>
>   -- Looks like a reference, but probably isn't: '500' on line 1011
>      '[500, 599]...'
>
>   -- Looks like a reference, but probably isn't: '599' on line 1011
>      '[500, 599]...'
>
>   -- Possible downref: Non-RFC (?) normative reference: ref. 'ISO10589'
>
> The fact that idnits looks at everything enclosed in [] as a reference
> does not mean the text requires revision.
> Idnits also does not allow that a non-RFC document can be a normative
> reference =E2=80=93 but clearly ISO 10589 is a normative reference.
>
>
> [jeff] indeed, we have used variety of non-RFC documents as normative
> references in the past, this should be acceptable in this case.
>
>
> Thanx.
>
>    Les
>
>
> *From:* Les Ginsberg (ginsberg)
> *Sent:* Monday, June 11, 2018 10:00 PM
> *To:* Uma Chunduri <umac.ietf@gmail.com>; lsr@ietf.org
> *Cc:* draft-ietf-isis-segment-routing-extensions@ietf.org; l
> sr-chairs@ietf.org; lsr-ads@ietf.org
> *Subject:* RE: draft-ietf-isis-segment-routing-extensions-16 - Shepherd
> review comments
>
> Uma =E2=80=93
>
> Thanx for the prompt review.
>
> I have attached proposed diffs to address some of your comments.
>
> Additional responses inline.
>
>
> *From:* Uma Chunduri <umac.ietf@gmail.com>
> *Sent:* Monday, June 11, 2018 6:27 PM
> *To:* lsr@ietf.org
> *Cc:* draft-ietf-isis-segment-routing-extensions@ietf.org; l
> sr-chairs@ietf.org; lsr-ads@ietf.org
> *Subject:* draft-ietf-isis-segment-routing-extensions-16 - Shepherd
> review comments
>
> Dear Authors,
>
> I have done shepherd  review of  draft-ietf-isis-segment-routing-extensio=
ns-16
> document as requested by LSR chairs. First, I would like to thank all the
> the authors and contributors on this document.
> I have few minor comments below  and would be great if authors take a loo=
k
> at these.
>
>
> =3D=3D=3D=3D=3D
>
> A. I see few ID nits (comments and warnings). Please fix  those.
> B. For the record: (as this would come up soon) : Currently there are 8
> front page authors and please indicate why this document should be given
> exception w.r.t 5 co-authors norm, that is being followed in general.
>
> *[Les:] This will be addressed after discussion among the authors =E2=80=
=93 thanx
> for the reminder. **J*
>
> 1. Abstract & Section 1
>
> a.
>    "These segments are   advertised by the link-state routing protocols
> (IS-IS and OSPF)."
>
>    I see more than LSR protocols e.g. https://tools.ietf.org/
> html/draft-ietf-idr-bgp-prefix-sid-07
>    Also not sure if this statement is necessary. Please either correct or
> remove this.
>
> *[Les:] The abstract and introduction state =E2=80=9Cwithin IGP topologie=
s=E2=80=9D.  In
> that context I believe limiting the protocols mentioned to IGPs is
> appropriate.*
>
> b.
>    "Two    types of segments are defined, Prefix segments and Adjacency
>   segments."
>
>    This document defines more than these two if you include Section 2.4
> (SID/Label Binding TLV). Section 2 is much better
>    where all types in this document are described as well as
> [I-D.ietf-spring-segment-routing] is referred for other types.
>    In that sense the above statement looks incomplete/repetitive.
>
> *[Les:] I have revised the text in this section =E2=80=93 see attached di=
ffs.*
>
>  2. Section 2.1
>
> a. "The 'Prefix SID' MUST   be unique within a given IGP domain (when the
> L-flag is not set)."
>
>    I see this is conflicting with what's been defined in
> https://tools.ietf.org/html/draft-ietf-spring-segment-routing-14,
> section 3.3 -
>    "Within an anycast group, all routers in an SR domain MUST
> advertise  the same prefix with the same SID value."
>
>    If you see otherwise please explain why?
>
> *[Les:] This is a misunderstanding on your part.*
> *An anycast prefix may be advertised by multiple nodes, but the Prefix SI=
D
> associated with the prefix is the same regardless of which node advertise=
s
> it. So there is no contradiction/conflict here.*
>
>
> b. "A 4 octet index defining.."
> What happens  to the computed label value if the index is of 4 octets
> value? I am asking this as index can have 4 octets but the eventual label
> (SRGB offset + index) would be only 20 bits.
> Can you point (if any)  references to https://tools.ietf.org/
> html/draft-ietf-spring-segment-routing-mpls appropriate sections -  is
> this is addressed there?
>
> *[Les:]
> See https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls-14=
#section-2.4
> <https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls-14#se=
ction-2.4> (emphasis
> added):*
>
> *=E2=80=9C 0 =3D< I < size. If the index "I" does not satisfy the previou=
s*
> *      inequality, **then the label cannot be calculated**.=E2=80=9D*
>
> c. "A Prefix-SID sub-TLV is associated to a prefix advertised by a node
>    and MAY be present in any of the following TLVs:"
>
>      Nit: Perhaps the list should include Section 2.5 too.
> *[Les:] Added a reference to 2.5 as well. See attached diffs. Thanx.*
>
> 3. Section 2.2.1
>
> a. "F-Flag: Address-Family flag..."
>
>      Not sure why this has to do with encapsulation? What happens if
> native IPv4/IPv6 data packet is using this SID with out any encapsulation=
?
> Could you please clarify.
>
> *[Les:] When the packet is forwarded over the specified outgoing interfac=
e
> it will either have an IPv4 encapsulation or an IPv6 encapsulation i.e.,
> the payload is encapsulated in the afi specific L3 protocol. *
> *This does not mean that a new AFI specific header is imposed.*
>
> 4. Section 2.2.2
>
> a. Nit: V and L flags: Content is duplicated and perhaps it can instead
> refer to section 2.2.1
>
>
> *[Les:] The text says:*
> *=E2=80=9C where F, B, V, L, S and P flags are defined in Section 2.2.1.=
=E2=80=9D*
>
> *???*
>
>
> 5. Section 3.2 and Section 2.1
>
>     Could you please clarify what is preferred if multiple prefix-sids
> with different algorithm values are advertised for the same SID value?
>
> *[Les:] There is no =E2=80=9Cpreference=E2=80=9D here. In order to have a=
lgorithm specific
> forwarding entries we MUST have different SIDs for each algorithm. A rout=
er
> will use the SID which matches the algorithm associated with the forwardi=
ng
> entry.*
>
> *     Les*
>
> --
> Uma C.
>
>
>

--0000000000004427de056e75d148
Content-Type: text/html; charset="UTF-8"
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<div dir=3D"ltr">Hi Jeff,<div><br></div><div>Thanks for your response. I wo=
uld note the same but this is obviously with Chairs and responsible AD&#39;=
s discretion.</div><div><br></div><div>Hi Les,</div><div><br></div><div>Tha=
nk you and I am fine here.</div><div><br></div><div>--</div><div>Uma C.</di=
v><div class=3D"gmail_extra"><br><div class=3D"gmail_quote">On Tue, Jun 12,=
 2018 at 10:14 AM, Jeff Tantsura <span dir=3D"ltr">&lt;<a href=3D"mailto:je=
fftant@gmail.com" target=3D"_blank">jefftant@gmail.com</a>&gt;</span> wrote=
:<br><blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-le=
ft:1px #ccc solid;padding-left:1ex"><div style=3D"word-wrap:break-word;line=
-break:after-white-space">Uma,<div><br></div><div>Wrt number of authors, if=
 I recall correctly (I don=E2=80=99t have pointers to the discussion anymor=
e), given the lengths and involvement of the authors currently on the front=
 page, as an exception - both ospf and isis sr drafts would keep the initia=
l number of authors.</div><div><br></div><div>Thanks,</div><div>Jeff</div><=
div><div><span class=3D""><br><blockquote type=3D"cite"><div>On Jun 11, 201=
8, at 22:05, Les Ginsberg (ginsberg) &lt;<a href=3D"mailto:ginsberg@cisco.c=
om" target=3D"_blank">ginsberg@cisco.com</a>&gt; wrote:</div><br class=3D"m=
_-4484478493861370063Apple-interchange-newline"><div><div class=3D"m_-44844=
78493861370063WordSection1" style=3D"font-family:Helvetica;font-size:12px;f=
ont-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing=
:normal;text-align:start;text-indent:0px;text-transform:none;white-space:no=
rmal;word-spacing:0px"><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt=
;font-family:&quot;Times New Roman&quot;,serif"><span style=3D"font-size:11=
pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Uma =E2=80=93<u></u=
><u></u></span></div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;f=
ont-family:&quot;Times New Roman&quot;,serif"><span style=3D"font-size:11pt=
;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u><=
/span></div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-famil=
y:&quot;Times New Roman&quot;,serif"><span style=3D"font-size:11pt;font-fam=
ily:Calibri,sans-serif;color:rgb(31,73,125)">One item I forgot=E2=80=A6ther=
e are no meaningful nits.<u></u><u></u></span></div><div style=3D"margin:0i=
n 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif=
"><span style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31=
,73,125)">Idnits reports:<u></u><u></u></span></div><div style=3D"margin:0i=
n 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif=
"><span style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31=
,73,125)"><u></u>=C2=A0<u></u></span></div><div style=3D"margin:0in 0in 0.0=
001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><span s=
tyle=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"=
>-- Looks like a reference, but probably isn&#39;t: &#39;100&#39; on line 1=
009<u></u><u></u></span></div><div style=3D"margin:0in 0in 0.0001pt;font-si=
ze:12pt;font-family:&quot;Times New Roman&quot;,serif"><span style=3D"font-=
size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">=C2=A0=C2=A0=
=C2=A0=C2=A0 &#39;SRGB =3D [100, 199]...&#39;<u></u><u></u></span></div><di=
v style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times N=
ew Roman&quot;,serif"><span style=3D"font-size:11pt;font-family:Calibri,san=
s-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></div><div style=
=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New Roma=
n&quot;,serif"><span style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">=C2=A0 -- Looks like a reference, but probably isn&#=
39;t: &#39;199&#39; on line 1009<u></u><u></u></span></div><div style=3D"ma=
rgin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot=
;,serif"><span style=3D"font-size:11pt;font-family:Calibri,sans-serif;color=
:rgb(31,73,125)">=C2=A0=C2=A0=C2=A0=C2=A0 &#39;SRGB =3D [100, 199]...&#39;<=
u></u><u></u></span></div><div style=3D"margin:0in 0in 0.0001pt;font-size:1=
2pt;font-family:&quot;Times New Roman&quot;,serif"><span style=3D"font-size=
:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u>=
</u></span></div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-=
family:&quot;Times New Roman&quot;,serif"><span style=3D"font-size:11pt;fon=
t-family:Calibri,sans-serif;color:rgb(31,73,125)">=C2=A0 -- Looks like a re=
ference, but probably isn&#39;t: &#39;1000&#39; on line 1010<u></u><u></u><=
/span></div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-famil=
y:&quot;Times New Roman&quot;,serif"><span style=3D"font-size:11pt;font-fam=
ily:Calibri,sans-serif;color:rgb(31,73,125)">=C2=A0=C2=A0=C2=A0=C2=A0 &#39;=
[1000, 1099]...&#39;<u></u><u></u></span></div><div style=3D"margin:0in 0in=
 0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><sp=
an style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,1=
25)"><u></u>=C2=A0<u></u></span></div><div style=3D"margin:0in 0in 0.0001pt=
;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><span style=
=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">=C2=
=A0 -- Looks like a reference, but probably isn&#39;t: &#39;1099&#39; on li=
ne 1010<u></u><u></u></span></div><div style=3D"margin:0in 0in 0.0001pt;fon=
t-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><span style=3D"f=
ont-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">=C2=A0=
=C2=A0=C2=A0=C2=A0 &#39;[1000, 1099]...&#39;<u></u><u></u></span></div><div=
 style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times Ne=
w Roman&quot;,serif"><span style=3D"font-size:11pt;font-family:Calibri,sans=
-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></div><div style=3D=
"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&q=
uot;,serif"><span style=3D"font-size:11pt;font-family:Calibri,sans-serif;co=
lor:rgb(31,73,125)">=C2=A0 -- Looks like a reference, but probably isn&#39;=
t: &#39;500&#39; on line 1011<u></u><u></u></span></div><div style=3D"margi=
n:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,s=
erif"><span style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rg=
b(31,73,125)">=C2=A0=C2=A0=C2=A0=C2=A0 &#39;[500, 599]...&#39;<u></u><u></u=
></span></div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-fam=
ily:&quot;Times New Roman&quot;,serif"><span style=3D"font-size:11pt;font-f=
amily:Calibri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span><=
/div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot=
;Times New Roman&quot;,serif"><span style=3D"font-size:11pt;font-family:Cal=
ibri,sans-serif;color:rgb(31,73,125)">=C2=A0 -- Looks like a reference, but=
 probably isn&#39;t: &#39;599&#39; on line 1011<u></u><u></u></span></div><=
div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times=
 New Roman&quot;,serif"><span style=3D"font-size:11pt;font-family:Calibri,s=
ans-serif;color:rgb(31,73,125)">=C2=A0=C2=A0=C2=A0=C2=A0 &#39;[500, 599]...=
&#39;<u></u><u></u></span></div><div style=3D"margin:0in 0in 0.0001pt;font-=
size:12pt;font-family:&quot;Times New Roman&quot;,serif"><span style=3D"fon=
t-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=
=A0<u></u></span></div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt=
;font-family:&quot;Times New Roman&quot;,serif"><span style=3D"font-size:11=
pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">=C2=A0 -- Possible =
downref: Non-RFC (?) normative reference: ref. &#39;ISO10589&#39;<u></u><u>=
</u></span></div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-=
family:&quot;Times New Roman&quot;,serif"><span style=3D"font-size:11pt;fon=
t-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></spa=
n></div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&q=
uot;Times New Roman&quot;,serif"><span style=3D"font-size:11pt;font-family:=
Calibri,sans-serif;color:rgb(31,73,125)">The fact that idnits looks at ever=
ything enclosed in [] as a reference does not mean the text requires revisi=
on.<u></u><u></u></span></div><div style=3D"margin:0in 0in 0.0001pt;font-si=
ze:12pt;font-family:&quot;Times New Roman&quot;,serif"><span style=3D"font-=
size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Idnits also =
does not allow that a non-RFC document can be a normative reference =E2=80=
=93 but clearly ISO 10589 is a normative reference.</span></div></div></div=
></blockquote><br></span>[jeff] indeed, we have used variety of non-RFC doc=
uments as=C2=A0normative references in the past, this should be acceptable =
in this case.<div><div class=3D"h5"><br><blockquote type=3D"cite"><div><div=
 class=3D"m_-4484478493861370063WordSection1" style=3D"font-family:Helvetic=
a;font-size:12px;font-style:normal;font-variant-caps:normal;font-weight:nor=
mal;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:n=
one;white-space:normal;word-spacing:0px"><div style=3D"margin:0in 0in 0.000=
1pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><span sty=
le=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><=
u></u><u></u></span></div><div style=3D"margin:0in 0in 0.0001pt;font-size:1=
2pt;font-family:&quot;Times New Roman&quot;,serif"><span style=3D"font-size=
:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u>=
</u></span></div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-=
family:&quot;Times New Roman&quot;,serif"><span style=3D"font-size:11pt;fon=
t-family:Calibri,sans-serif;color:rgb(31,73,125)">Thanx.<u></u><u></u></spa=
n></div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&q=
uot;Times New Roman&quot;,serif"><span style=3D"font-size:11pt;font-family:=
Calibri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></div><=
div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times=
 New Roman&quot;,serif"><span style=3D"font-size:11pt;font-family:Calibri,s=
ans-serif;color:rgb(31,73,125)">=C2=A0=C2=A0 Les<u></u><u></u></span></div>=
<div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Time=
s New Roman&quot;,serif"><span style=3D"font-size:11pt;font-family:Calibri,=
sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></div><div styl=
e=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New Rom=
an&quot;,serif"><span style=3D"font-size:11pt;font-family:Calibri,sans-seri=
f;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></div><div style=3D"bord=
er-style:none none none solid;border-left-width:1.5pt;border-left-color:blu=
e;padding:0in 0in 0in 4pt"><div><div style=3D"border-style:solid none none;=
border-top-width:1pt;border-top-color:rgb(225,225,225);padding:3pt 0in 0in"=
><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Tim=
es New Roman&quot;,serif"><b><span style=3D"font-size:11pt;font-family:Cali=
bri,sans-serif">From:</span></b><span style=3D"font-size:11pt;font-family:C=
alibri,sans-serif"><span class=3D"m_-4484478493861370063Apple-converted-spa=
ce">=C2=A0</span>Les Ginsberg (ginsberg)<span class=3D"m_-44844784938613700=
63Apple-converted-space">=C2=A0</span><br><b>Sent:</b><span class=3D"m_-448=
4478493861370063Apple-converted-space">=C2=A0</span>Monday, June 11, 2018 1=
0:00 PM<br><b>To:</b><span class=3D"m_-4484478493861370063Apple-converted-s=
pace">=C2=A0</span>Uma Chunduri &lt;<a href=3D"mailto:umac.ietf@gmail.com" =
style=3D"color:purple;text-decoration:underline" target=3D"_blank">umac.iet=
f@gmail.com</a>&gt;;<span class=3D"m_-4484478493861370063Apple-converted-sp=
ace">=C2=A0</span><a href=3D"mailto:lsr@ietf.org" style=3D"color:purple;tex=
t-decoration:underline" target=3D"_blank">lsr@<wbr>ietf.org</a><br><b>Cc:</=
b><span class=3D"m_-4484478493861370063Apple-converted-space">=C2=A0</span>=
<a href=3D"mailto:draft-ietf-isis-segment-routing-extensions@ietf.org" styl=
e=3D"color:purple;text-decoration:underline" target=3D"_blank">draft-ietf-i=
sis-segment-<wbr>routing-extensions@ietf.org</a>;<span class=3D"m_-44844784=
93861370063Apple-converted-space">=C2=A0</span><a href=3D"mailto:lsr-chairs=
@ietf.org" style=3D"color:purple;text-decoration:underline" target=3D"_blan=
k">l<wbr>sr-chairs@ietf.org</a>;<span class=3D"m_-4484478493861370063Apple-=
converted-space">=C2=A0</span><a href=3D"mailto:lsr-ads@ietf.org" style=3D"=
color:purple;text-decoration:underline" target=3D"_blank">lsr-ads@<wbr>ietf=
.org</a><br><b>Subject:</b><span class=3D"m_-4484478493861370063Apple-conve=
rted-space">=C2=A0</span>RE: draft-ietf-isis-segment-<wbr>routing-extension=
s-16 - Shepherd review comments<u></u><u></u></span></div></div></div><div =
style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New=
 Roman&quot;,serif"><u></u>=C2=A0<u></u></div><div style=3D"margin:0in 0in =
0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><spa=
n style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,12=
5)">Uma =E2=80=93<u></u><u></u></span></div><div style=3D"margin:0in 0in 0.=
0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><span =
style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)=
"><u></u>=C2=A0<u></u></span></div><div style=3D"margin:0in 0in 0.0001pt;fo=
nt-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><span style=3D"=
font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">Thanx f=
or the prompt review.<u></u><u></u></span></div><div style=3D"margin:0in 0i=
n 0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><s=
pan style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,=
125)"><u></u>=C2=A0<u></u></span></div><div style=3D"margin:0in 0in 0.0001p=
t;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><span style=
=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">I h=
ave attached proposed diffs to address some of your comments.<u></u><u></u>=
</span></div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-fami=
ly:&quot;Times New Roman&quot;,serif"><span style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></=
div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;=
Times New Roman&quot;,serif"><span style=3D"font-size:11pt;font-family:Cali=
bri,sans-serif;color:rgb(31,73,125)">Additional responses inline.<u></u><u>=
</u></span></div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-=
family:&quot;Times New Roman&quot;,serif"><span style=3D"font-size:11pt;fon=
t-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></spa=
n></div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&q=
uot;Times New Roman&quot;,serif"><span style=3D"font-size:11pt;font-family:=
Calibri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></div><=
div style=3D"border-style:none none none solid;border-left-width:1.5pt;bord=
er-left-color:blue;padding:0in 0in 0in 4pt"><div><div style=3D"border-style=
:solid none none;border-top-width:1pt;border-top-color:rgb(225,225,225);pad=
ding:3pt 0in 0in"><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font=
-family:&quot;Times New Roman&quot;,serif"><b><span style=3D"font-size:11pt=
;font-family:Calibri,sans-serif">From:</span></b><span style=3D"font-size:1=
1pt;font-family:Calibri,sans-serif"><span class=3D"m_-4484478493861370063Ap=
ple-converted-space">=C2=A0</span>Uma Chunduri &lt;<a href=3D"mailto:umac.i=
etf@gmail.com" style=3D"color:purple;text-decoration:underline" target=3D"_=
blank">umac.ietf@gmail.com</a>&gt;<span class=3D"m_-4484478493861370063Appl=
e-converted-space">=C2=A0</span><br><b>Sent:</b><span class=3D"m_-448447849=
3861370063Apple-converted-space">=C2=A0</span>Monday, June 11, 2018 6:27 PM=
<br><b>To:</b><span class=3D"m_-4484478493861370063Apple-converted-space">=
=C2=A0</span><a href=3D"mailto:lsr@ietf.org" style=3D"color:purple;text-dec=
oration:underline" target=3D"_blank">lsr@ietf.org</a><br><b>Cc:</b><span cl=
ass=3D"m_-4484478493861370063Apple-converted-space">=C2=A0</span><a href=3D=
"mailto:draft-ietf-isis-segment-routing-extensions@ietf.org" style=3D"color=
:purple;text-decoration:underline" target=3D"_blank">draft-ietf-isis-segmen=
t-<wbr>routing-extensions@ietf.org</a>;<span class=3D"m_-448447849386137006=
3Apple-converted-space">=C2=A0</span><a href=3D"mailto:lsr-chairs@ietf.org"=
 style=3D"color:purple;text-decoration:underline" target=3D"_blank">l<wbr>s=
r-chairs@ietf.org</a>;<span class=3D"m_-4484478493861370063Apple-converted-=
space">=C2=A0</span><a href=3D"mailto:lsr-ads@ietf.org" style=3D"color:purp=
le;text-decoration:underline" target=3D"_blank">lsr-ads@<wbr>ietf.org</a><b=
r><b>Subject:</b><span class=3D"m_-4484478493861370063Apple-converted-space=
">=C2=A0</span>draft-ietf-isis-<wbr>segment-routing-extensions-16 - Shepher=
d review comments<u></u><u></u></span></div></div></div><div style=3D"margi=
n:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,s=
erif"><u></u>=C2=A0<u></u></div><div><div style=3D"margin:0in 0in 0.0001pt;=
font-size:12pt;font-family:&quot;Times New Roman&quot;,serif">Dear Authors,=
<u></u><u></u></div><div><div style=3D"margin:0in 0in 0.0001pt;font-size:12=
pt;font-family:&quot;Times New Roman&quot;,serif"><u></u>=C2=A0<u></u></div=
></div><div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-famil=
y:&quot;Times New Roman&quot;,serif">I have done shepherd=C2=A0 review of=
=C2=A0=C2=A0draft-ietf-isis-segment-<wbr>routing-extensions-16 document as =
requested by LSR chairs.=C2=A0First, I would like to thank all the the auth=
ors and contributors on this document.<u></u><u></u></div></div><div><div s=
tyle=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New =
Roman&quot;,serif">I have few minor comments below=C2=A0 and would be great=
 if authors take a look at these.<u></u><u></u></div></div><div><div style=
=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New Roma=
n&quot;,serif"><u></u>=C2=A0<u></u></div></div><div><div style=3D"margin:0i=
n 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif=
"><u></u>=C2=A0<u></u></div></div><div><div style=3D"margin:0in 0in 0.0001p=
t;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><span style=
=3D"font-size:11pt;font-family:Calibri,sans-serif">=3D=3D=3D=3D=3D<u></u><u=
></u></span></div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font=
-family:&quot;Times New Roman&quot;,serif"><span style=3D"font-size:11pt;fo=
nt-family:Calibri,sans-serif"><u></u>=C2=A0<u></u></span></div><div style=
=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New Roma=
n&quot;,serif"><span style=3D"font-size:11pt;font-family:Calibri,sans-serif=
">A. I see few ID nits (comments and warnings). Please fix=C2=A0 those.<u><=
/u><u></u></span></div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt=
;font-family:&quot;Times New Roman&quot;,serif"><span style=3D"font-size:11=
pt;font-family:Calibri,sans-serif">B. For the record: (as this would come u=
p soon) : Currently there are 8=C2=A0 front page authors and please indicat=
e why this document should be given exception w.r.t 5 co-authors norm, that=
 is being followed in general.<u></u><u></u></span></div><div style=3D"marg=
in:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,=
serif"><span style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:r=
gb(31,73,125)"><u></u>=C2=A0<u></u></span></div><div style=3D"margin:0in 0i=
n 0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><b=
><i><span style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(=
31,73,125)">[Les:] This will be addressed after discussion among the author=
s =E2=80=93 thanx for the reminder.<span class=3D"m_-4484478493861370063App=
le-converted-space">=C2=A0</span></span></i></b><b><i><span style=3D"font-s=
ize:11pt;font-family:Wingdings;color:rgb(31,73,125)">J</span></i></b><b><i>=
<span style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,7=
3,125)"><u></u><u></u></span></i></b></div><div style=3D"margin:0in 0in 0.0=
001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><span s=
tyle=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"=
><u></u>=C2=A0<u></u></span></div><div style=3D"margin:0in 0in 0.0001pt;fon=
t-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><span style=3D"f=
ont-size:11pt;font-family:Calibri,sans-serif">1. Abstract &amp; Section 1<u=
></u><u></u></span></div><div style=3D"margin:0in 0in 0.0001pt;font-size:12=
pt;font-family:&quot;Times New Roman&quot;,serif"><span style=3D"font-size:=
11pt;font-family:Calibri,sans-serif">=C2=A0<u></u><u></u></span></div><div =
style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New=
 Roman&quot;,serif"><span style=3D"font-size:11pt;font-family:Calibri,sans-=
serif">a.<u></u><u></u></span></div><div style=3D"margin:0in 0in 0.0001pt;f=
ont-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><span style=3D=
"font-size:11pt;font-family:Calibri,sans-serif">=C2=A0=C2=A0 &quot;These se=
gments are =C2=A0=C2=A0advertised by the link-state routing protocols (IS-I=
S and OSPF).&quot;<u></u><u></u></span></div><div style=3D"margin:0in 0in 0=
.0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><span=
 style=3D"font-size:11pt;font-family:Calibri,sans-serif">=C2=A0<u></u><u></=
u></span></div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-fa=
mily:&quot;Times New Roman&quot;,serif"><span style=3D"font-size:11pt;font-=
family:Calibri,sans-serif">=C2=A0=C2=A0 I see more than LSR protocols e.g.<=
span class=3D"m_-4484478493861370063Apple-converted-space">=C2=A0</span><a =
href=3D"https://tools.ietf.org/html/draft-ietf-idr-bgp-prefix-sid-07" style=
=3D"color:purple;text-decoration:underline" target=3D"_blank">https://tools=
.ietf.org/<wbr>html/draft-ietf-idr-bgp-<wbr>prefix-sid-07</a><u></u><u></u>=
</span></div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-fami=
ly:&quot;Times New Roman&quot;,serif"><span style=3D"font-size:11pt;font-fa=
mily:Calibri,sans-serif">=C2=A0=C2=A0 Also not sure if this statement is ne=
cessary. Please either correct or remove this.<u></u><u></u></span></div><d=
iv style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times =
New Roman&quot;,serif"><span style=3D"font-size:11pt;font-family:Calibri,sa=
ns-serif">=C2=A0<u></u><u></u></span></div><div style=3D"margin:0in 0in 0.0=
001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><b><i><=
span style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73=
,125)">[Les:] The abstract and introduction state =E2=80=9Cwithin IGP topol=
ogies=E2=80=9D.=C2=A0 In that context I believe limiting the protocols ment=
ioned to IGPs is appropriate.<u></u><u></u></span></i></b></div><div style=
=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New Roma=
n&quot;,serif"><span style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></div><div style=3D"margi=
n:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,s=
erif"><span style=3D"font-size:11pt;font-family:Calibri,sans-serif">b.<u></=
u><u></u></span></div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;=
font-family:&quot;Times New Roman&quot;,serif"><span style=3D"font-size:11p=
t;font-family:Calibri,sans-serif">=C2=A0=C2=A0 &quot;Two =C2=A0=C2=A0=C2=A0=
types of segments are defined, Prefix segments and Adjacency =C2=A0=C2=A0se=
gments.&quot;<u></u><u></u></span></div><div style=3D"margin:0in 0in 0.0001=
pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><span styl=
e=3D"font-size:11pt;font-family:Calibri,sans-serif">=C2=A0<u></u><u></u></s=
pan></div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:=
&quot;Times New Roman&quot;,serif"><span style=3D"font-size:11pt;font-famil=
y:Calibri,sans-serif">=C2=A0=C2=A0 This document defines more than these tw=
o if you include Section 2.4 (SID/Label Binding TLV). Section 2 is much bet=
ter<u></u><u></u></span></div><div style=3D"margin:0in 0in 0.0001pt;font-si=
ze:12pt;font-family:&quot;Times New Roman&quot;,serif"><span style=3D"font-=
size:11pt;font-family:Calibri,sans-serif">=C2=A0=C2=A0 where all types in t=
his document are described as well as=C2=A0=C2=A0 [I-D.ietf-spring-segment-=
<wbr>routing] is referred for other types.<u></u><u></u></span></div><div s=
tyle=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New =
Roman&quot;,serif"><span style=3D"font-size:11pt;font-family:Calibri,sans-s=
erif">=C2=A0=C2=A0 In that sense the above statement looks incomplete/repet=
itive.<u></u><u></u></span></div><div style=3D"margin:0in 0in 0.0001pt;font=
-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><span style=3D"fo=
nt-size:11pt;font-family:Calibri,sans-serif">=C2=A0<u></u><u></u></span></d=
iv><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;T=
imes New Roman&quot;,serif"><b><i><span style=3D"font-size:11pt;font-family=
:Calibri,sans-serif;color:rgb(31,73,125)">[Les:] I have revised the text in=
 this section =E2=80=93 see attached diffs.<u></u><u></u></span></i></b></d=
iv><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;T=
imes New Roman&quot;,serif"><span style=3D"font-size:11pt;font-family:Calib=
ri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></div><div s=
tyle=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New =
Roman&quot;,serif"><span style=3D"font-size:11pt;font-family:Calibri,sans-s=
erif">=C2=A02. Section 2.1<u></u><u></u></span></div><div style=3D"margin:0=
in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,seri=
f"><span style=3D"font-size:11pt;font-family:Calibri,sans-serif">=C2=A0<u><=
/u><u></u></span></div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt=
;font-family:&quot;Times New Roman&quot;,serif"><span style=3D"font-size:11=
pt;font-family:Calibri,sans-serif">a. &quot;The &#39;Prefix SID&#39; MUST =
=C2=A0=C2=A0be unique within a given IGP domain (when the L-flag is not set=
).&quot;<u></u><u></u></span></div><div style=3D"margin:0in 0in 0.0001pt;fo=
nt-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><span style=3D"=
font-size:11pt;font-family:Calibri,sans-serif">=C2=A0<u></u><u></u></span><=
/div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot=
;Times New Roman&quot;,serif"><span style=3D"font-size:11pt;font-family:Cal=
ibri,sans-serif">=C2=A0=C2=A0 I see this is conflicting with what&#39;s bee=
n defined in<span class=3D"m_-4484478493861370063Apple-converted-space">=C2=
=A0</span><a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-=
routing-14" style=3D"color:purple;text-decoration:underline" target=3D"_bla=
nk">https://tools.ietf.org/<wbr>html/draft-ietf-spring-<wbr>segment-routing=
-14</a>,<u></u><u></u></span></div><div style=3D"margin:0in 0in 0.0001pt 0.=
5in;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><span sty=
le=3D"font-size:11pt;font-family:Calibri,sans-serif">section 3.3 -<u></u><u=
></u></span></div><div style=3D"margin:0in 0in 0.0001pt 0.5in;font-size:12p=
t;font-family:&quot;Times New Roman&quot;,serif"><span style=3D"font-size:1=
1pt;font-family:Calibri,sans-serif">=C2=A0=C2=A0 &quot;Within an anycast gr=
oup, all routers in an SR domain MUST advertise=C2=A0=C2=A0the same prefix =
with the same SID value.&quot;<u></u><u></u></span></div><div style=3D"marg=
in:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,=
serif"><span style=3D"font-size:11pt;font-family:Calibri,sans-serif">=C2=A0=
<u></u><u></u></span></div><div style=3D"margin:0in 0in 0.0001pt;font-size:=
12pt;font-family:&quot;Times New Roman&quot;,serif"><span style=3D"font-siz=
e:11pt;font-family:Calibri,sans-serif">=C2=A0 =C2=A0If you see otherwise pl=
ease explain why?<u></u><u></u></span></div><div style=3D"margin:0in 0in 0.=
0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><span =
style=3D"font-size:11pt;font-family:Calibri,sans-serif">=C2=A0<u></u><u></u=
></span></div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-fam=
ily:&quot;Times New Roman&quot;,serif"><b><i><span style=3D"font-size:11pt;=
font-family:Calibri,sans-serif;color:rgb(31,73,125)">[Les:] This is a misun=
derstanding on your part.<u></u><u></u></span></i></b></div><div style=3D"m=
argin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&quo=
t;,serif"><b><i><span style=3D"font-size:11pt;font-family:Calibri,sans-seri=
f;color:rgb(31,73,125)">An anycast prefix may be advertised by multiple nod=
es, but the Prefix SID associated with the prefix is the same regardless of=
 which node advertises it. So there is no contradiction/conflict here.<u></=
u><u></u></span></i></b></div><div style=3D"margin:0in 0in 0.0001pt;font-si=
ze:12pt;font-family:&quot;Times New Roman&quot;,serif"><b><i><span style=3D=
"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u=
>=C2=A0<u></u></span></i></b></div><div style=3D"margin:0in 0in 0.0001pt;fo=
nt-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><span style=3D"=
font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u></u>=
=C2=A0<u></u></span></div><div style=3D"margin:0in 0in 0.0001pt;font-size:1=
2pt;font-family:&quot;Times New Roman&quot;,serif"><span style=3D"font-size=
:11pt;font-family:Calibri,sans-serif">b. &quot;A 4 octet index defining..&q=
uot;<u></u><u></u></span></div><div style=3D"margin:0in 0in 0.0001pt;font-s=
ize:12pt;font-family:&quot;Times New Roman&quot;,serif;text-indent:9pt"><sp=
an style=3D"font-size:11pt;font-family:Calibri,sans-serif">What happens=C2=
=A0 to the computed label value if the index is of 4 octets value? I am ask=
ing this as index can have 4 octets but the eventual label (SRGB offset + i=
ndex) would be only 20 bits.<span class=3D"m_-4484478493861370063Apple-conv=
erted-space">=C2=A0</span><u></u><u></u></span></div><div style=3D"margin:0=
in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,seri=
f;text-indent:9pt"><span style=3D"font-size:11pt;font-family:Calibri,sans-s=
erif">Can you point (if any)=C2=A0 references to<span class=3D"m_-448447849=
3861370063Apple-converted-space">=C2=A0</span><a href=3D"https://tools.ietf=
.org/html/draft-ietf-spring-segment-routing-mpls" style=3D"color:purple;tex=
t-decoration:underline" target=3D"_blank">https://tools.ietf.org/<wbr>html/=
draft-ietf-spring-<wbr>segment-routing-mpls</a><span class=3D"m_-4484478493=
861370063Apple-converted-space">=C2=A0</span>appropria<wbr>te sections -=C2=
=A0 is this is addressed there?<u></u><u></u></span></div><div style=3D"mar=
gin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;=
,serif"><span style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:=
rgb(31,73,125)"><u></u>=C2=A0<u></u></span></div><div style=3D"margin:0in 0=
in 0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><=
b><i><span style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb=
(31,73,125)">[Les:] See<span class=3D"m_-4484478493861370063Apple-converted=
-space">=C2=A0</span><a href=3D"https://tools.ietf.org/html/draft-ietf-spri=
ng-segment-routing-mpls-14#section-2.4" style=3D"color:purple;text-decorati=
on:underline" target=3D"_blank">https://tools.ietf.org/<wbr>html/draft-ietf=
-spring-<wbr>segment-routing-mpls-14#<wbr>section-2.4</a><span class=3D"m_-=
4484478493861370063Apple-converted-space">=C2=A0</span>(emphasis added):<u>=
</u><u></u></span></i></b></div><div style=3D"margin:0in 0in 0.0001pt;font-=
size:12pt;font-family:&quot;Times New Roman&quot;,serif"><b><i><span style=
=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u>=
</u>=C2=A0<u></u></span></i></b></div><div style=3D"margin:0in 0in 0.0001pt=
 5.25pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><b><i=
><span style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,=
73,125)">=E2=80=9C 0 =3D&lt; I &lt; size. If the index &quot;I&quot; does n=
ot satisfy the previous<u></u><u></u></span></i></b></div><div style=3D"mar=
gin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;=
,serif"><b><i><span style=3D"font-size:11pt;font-family:Calibri,sans-serif;=
color:rgb(31,73,125)">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 inequality,<span class=
=3D"m_-4484478493861370063Apple-converted-space">=C2=A0</span></span></i></=
b><b><i><span style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:=
red">then the label cannot be calculated</span></i></b><b><i><span style=3D=
"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">.=E2=
=80=9D<u></u><u></u></span></i></b></div><div style=3D"margin:0in 0in 0.000=
1pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><span sty=
le=3D"font-size:11pt;font-family:Calibri,sans-serif">=C2=A0<u></u><u></u></=
span></div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family=
:&quot;Times New Roman&quot;,serif"><span style=3D"font-size:11pt;font-fami=
ly:Calibri,sans-serif">c. &quot;A Prefix-SID sub-TLV is associated to a pre=
fix advertised by a node =C2=A0=C2=A0=C2=A0and MAY be present in any of the=
 following TLVs:&quot;<u></u><u></u></span></div><div style=3D"margin:0in 0=
in 0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><=
span style=3D"font-size:11pt;font-family:Calibri,sans-serif">=C2=A0<u></u><=
u></u></span></div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;fon=
t-family:&quot;Times New Roman&quot;,serif"><span style=3D"font-size:11pt;f=
ont-family:Calibri,sans-serif">=C2=A0 =C2=A0=C2=A0=C2=A0Nit: Perhaps the li=
st should include Section 2.5 too.<u></u><u></u></span></div><div style=3D"=
margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&qu=
ot;,serif"><b><i><span style=3D"font-size:11pt;font-family:Calibri,sans-ser=
if;color:rgb(31,73,125)">[Les:] Added a reference to 2.5 as well. See attac=
hed diffs. Thanx.</span></i></b><span style=3D"font-size:11pt;font-family:C=
alibri,sans-serif;color:rgb(31,73,125)"><u></u><u></u></span></div><div sty=
le=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New Ro=
man&quot;,serif"><span style=3D"font-size:11pt;font-family:Calibri,sans-ser=
if">=C2=A0<u></u><u></u></span></div><div style=3D"margin:0in 0in 0.0001pt;=
font-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><span style=
=3D"font-size:11pt;font-family:Calibri,sans-serif">3. Section 2.2.1<u></u><=
u></u></span></div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;fon=
t-family:&quot;Times New Roman&quot;,serif"><span style=3D"font-size:11pt;f=
ont-family:Calibri,sans-serif">=C2=A0=C2=A0=C2=A0<u></u><u></u></span></div=
><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Tim=
es New Roman&quot;,serif"><span style=3D"font-size:11pt;font-family:Calibri=
,sans-serif">a. &quot;F-Flag: Address-Family flag...&quot;<u></u><u></u></s=
pan></div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:=
&quot;Times New Roman&quot;,serif"><span style=3D"font-size:11pt;font-famil=
y:Calibri,sans-serif">=C2=A0<u></u><u></u></span></div><div style=3D"margin=
:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,se=
rif"><span style=3D"font-size:11pt;font-family:Calibri,sans-serif">=C2=A0=
=C2=A0=C2=A0=C2=A0 Not sure why this has to do with encapsulation? What hap=
pens if native IPv4/IPv6 data packet is using this SID with out any encapsu=
lation? Could you please clarify.<u></u><u></u></span></div><div style=3D"m=
argin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&quo=
t;,serif"><span style=3D"font-size:11pt;font-family:Calibri,sans-serif;colo=
r:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></div><div style=3D"margin:0in=
 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif"=
><b><i><span style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:r=
gb(31,73,125)">[Les:] When the packet is forwarded over the specified outgo=
ing interface it will either have an IPv4 encapsulation or an IPv6 encapsul=
ation i.e., the payload is encapsulated in the afi specific L3 protocol.<sp=
an class=3D"m_-4484478493861370063Apple-converted-space">=C2=A0</span><u></=
u><u></u></span></i></b></div><div style=3D"margin:0in 0in 0.0001pt;font-si=
ze:12pt;font-family:&quot;Times New Roman&quot;,serif"><b><i><span style=3D=
"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">This d=
oes not mean that a new AFI specific header is imposed.<u></u><u></u></span=
></i></b></div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-fa=
mily:&quot;Times New Roman&quot;,serif"><span style=3D"font-size:11pt;font-=
family:Calibri,sans-serif">=C2=A0=C2=A0<u></u><u></u></span></div><div styl=
e=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New Rom=
an&quot;,serif"><span style=3D"font-size:11pt;font-family:Calibri,sans-seri=
f">4. Section 2.2.2<u></u><u></u></span></div><div style=3D"margin:0in 0in =
0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><spa=
n style=3D"font-size:11pt;font-family:Calibri,sans-serif">=C2=A0<u></u><u><=
/u></span></div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-f=
amily:&quot;Times New Roman&quot;,serif"><span style=3D"font-size:11pt;font=
-family:Calibri,sans-serif">a. Nit: V and L flags: Content is duplicated an=
d perhaps it can instead refer to section 2.2.1<u></u><u></u></span></div><=
div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times=
 New Roman&quot;,serif"><span style=3D"font-size:11pt;font-family:Calibri,s=
ans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></div><div style=
=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New Roma=
n&quot;,serif"><span style=3D"color:rgb(31,73,125)"><u></u>=C2=A0<u></u></s=
pan></div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:=
&quot;Times New Roman&quot;,serif"><b><i><span style=3D"font-size:11pt;font=
-family:Calibri,sans-serif;color:rgb(31,73,125)">[Les:] The text says:<u></=
u><u></u></span></i></b></div><div style=3D"margin:0in 0in 0.0001pt;font-si=
ze:12pt;font-family:&quot;Times New Roman&quot;,serif"><b><i><span style=3D=
"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)">=E2=80=
=9C where F, B, V, L, S and P flags are defined in Section 2.2.1.=E2=80=9D<=
u></u><u></u></span></i></b></div><div style=3D"margin:0in 0in 0.0001pt;fon=
t-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><b><i><span styl=
e=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"><u=
></u>=C2=A0<u></u></span></i></b></div><div style=3D"margin:0in 0in 0.0001p=
t;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><b><i><span=
 style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125=
)">???<u></u><u></u></span></i></b></div><div style=3D"margin:0in 0in 0.000=
1pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><b><i><sp=
an style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,1=
25)"><u></u>=C2=A0<u></u></span></i></b></div><div style=3D"margin:0in 0in =
0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><spa=
n style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,12=
5)"><u></u>=C2=A0<u></u></span></div></div><div><div style=3D"margin:0in 0i=
n 0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif">5.=
 Section 3.2 and Section 2.1<u></u><u></u></div></div><div><div style=3D"ma=
rgin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot=
;,serif"><u></u>=C2=A0<u></u></div></div><div><div style=3D"margin:0in 0in =
0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif">=C2=
=A0 =C2=A0 Could you please clarify what is preferred if multiple prefix-si=
ds with different algorithm values are advertised for the same SID value?=
=C2=A0<u></u><u></u></div></div><div><div style=3D"margin:0in 0in 0.0001pt;=
font-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><span style=
=3D"color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></div><div style=3D"ma=
rgin:0in 0in 0.0001pt;font-size:12pt;font-family:&quot;Times New Roman&quot=
;,serif"><b><i><span style=3D"font-size:11pt;font-family:Calibri,sans-serif=
;color:rgb(31,73,125)">[Les:] There is no =E2=80=9Cpreference=E2=80=9D here=
. In order to have algorithm specific forwarding entries we MUST have diffe=
rent SIDs for each algorithm. A router will use the SID which matches the a=
lgorithm associated with the forwarding entry.<u></u><u></u></span></i></b>=
</div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family:&quo=
t;Times New Roman&quot;,serif"><b><i><span style=3D"font-size:11pt;font-fam=
ily:Calibri,sans-serif;color:rgb(31,73,125)"><u></u>=C2=A0<u></u></span></i=
></b></div><div style=3D"margin:0in 0in 0.0001pt;font-size:12pt;font-family=
:&quot;Times New Roman&quot;,serif"><b><i><span style=3D"font-size:11pt;fon=
t-family:Calibri,sans-serif;color:rgb(31,73,125)">=C2=A0=C2=A0=C2=A0=C2=A0 =
Les<u></u><u></u></span></i></b></div><div style=3D"margin:0in 0in 0.0001pt=
;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif"><b><i><span =
style=3D"font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)=
"><u></u>=C2=A0<u></u></span></i></b></div><div style=3D"margin:0in 0in 0.0=
001pt;font-size:12pt;font-family:&quot;Times New Roman&quot;,serif">--<u></=
u><u></u></div></div><div><div style=3D"margin:0in 0in 0.0001pt;font-size:1=
2pt;font-family:&quot;Times New Roman&quot;,serif">Uma C.<u></u><u></u></di=
v></div></div></div></div></div></div></blockquote></div></div></div><br></=
div></div></blockquote></div><br></div></div>

--0000000000004427de056e75d148--


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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: "Van De Velde, Gunter (Nokia - BE/Antwerp)" <gunter.van_de_velde@nokia.com>, "idr@ietf.org" <idr@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: Signalling ERLD (ISIS, OSPF and BGP-LS)
Thread-Index: AdQCVS4zJNJrYGL7RvyJWFnJWJ9mLgAhqsxQ
Date: Wed, 13 Jun 2018 06:05:28 +0000
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Subject: Re: [Lsr] Signalling ERLD (ISIS, OSPF and BGP-LS)
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Hi Gunter,

The difference in IGP signalling seems to be because the ELC is a capabilit=
y which is advertised differently than ERLD which is a limit. Are you sayin=
g that ELC does not have value by itself without the ERLD?

IMHO it makes sense to retain ELC as capability of the router (as specified=
 in the IGP specs) and position ERLD as a MSD sub-type for indicating the l=
imit. This way we have the flexibility of signalling ERLD both per node and=
 per ingress link/LC level.

Thanks,
Ketan

-----Original Message-----
From: Idr <idr-bounces@ietf.org> On Behalf Of Van De Velde, Gunter (Nokia -=
 BE/Antwerp)
Sent: 12 June 2018 19:28
To: idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)

In LSR WG the following drafts document the signaling of ELC and RLD:
* draft-ietf-ospf-mpls-elc
* draft-ietf-isis-mpls-elc

When exporting this information using BGP-LS encoding to a controller, ther=
e is need for BGP-LS extension by means of new TLVs.

BGP-LS is signaling ERLD (entropy capable readable label depth) ISIS/OSPF i=
s signaling individually ELC and RLD

I was working upon the IANA section, and discovered some inconsistency that=
 should be addressed:
* Why is IGP signaling individual ELC and RLD? ERLD is what was decided upo=
n (https://tools.ietf.org/html/draft-ietf-mpls-spring-entropy-label-10)
* What are the plans to request IANA code points for these drafts?
* (E)RLD seems to have meaning only from NODE perspective, (I assume that L=
INK ERLD is not of any value at all, is that a correct assumption?)

G/


-----Original Message-----
From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of internet-drafts@ietf.o=
rg
Sent: Tuesday, June 12, 2018 15:25
To: i-d-announce@ietf.org
Cc: idr@ietf.org
Subject: [Idr] I-D Action: draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt


A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : Signalling ERLD using BGP-LS
        Authors         : Gunter Van de Velde
                          Wim Henderickx
                          Matthew Bocci
                          Keyur Patel
	Filename        : draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt
	Pages           : 6
	Date            : 2018-06-12

Abstract:
   This document defines the attribute encoding to use for BGP-LS to
   expose ERLD "Entropy capable Readable Label Depth" from a node to a
   centralised controller (PCE/SDN).



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-rld/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-rld-02
https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-ls-segment-routing=
-rld-02

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-idr-bgp-ls-segment-routing-r=
ld-02


Please note that it may take a couple of minutes from the time of submissio=
n 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/

_______________________________________________
Idr mailing list
Idr@ietf.org
https://www.ietf.org/mailman/listinfo/idr

_______________________________________________
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https://www.ietf.org/mailman/listinfo/idr


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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Uma Chunduri <umac.ietf@gmail.com>
CC: "lsr@ietf.org" <lsr@ietf.org>, "draft-ietf-isis-segment-routing-extensions@ietf.org" <draft-ietf-isis-segment-routing-extensions@ietf.org>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>, "lsr-ads@ietf.org" <lsr-ads@ietf.org>
Thread-Topic: draft-ietf-isis-segment-routing-extensions-16 - Shepherd review comments
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Date: Wed, 13 Jun 2018 07:03:59 +0000
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From: "Van De Velde, Gunter (Nokia - BE/Antwerp)" <gunter.van_de_velde@nokia.com>
To: "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "idr@ietf.org" <idr@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: Signalling ERLD (ISIS, OSPF and BGP-LS)
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/jD7GuR3yXmIkfyIsJPr5rQKy5nY>
Subject: Re: [Lsr] Signalling ERLD (ISIS, OSPF and BGP-LS)
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Indeed, the debate that made BGP-LS to go down the ERLD path is of pragmati=
c motivation.

The major Readable Label Depth use-case is entropy. Hence, if the ERLD TLV =
is available, then ELC can be implicitly assumed. No pragmatic reason to si=
gnal separately, as it just make things more complex then should be.=20

>From a holistic perspective having something similar, yet different, in bot=
h IGP and BGP-LS encoding=20
seems to make little sense and only bring confusion (router/controller impl=
ementers and network operators).=20

The ways to address this in IGP and BGP-LS going forward:
1) do nothing and leave all as it is (it has potential to create massive co=
nfusion)=20
2) only signal ERLD TLV in IGP and BGP
3) signal ELC TLV and RLD TLV (unclear pragmatic value of explicit signalin=
g of ELC TLV compared to option (2))=20
4) signal ELC TLV, RLD TLV and ERLD TLV (it has all, but is much much more =
complex as option (2))

I believe that option (2) is the best option:
* it bring the needed readable label depth value to operators=20
* most simple solution for implementers (routers and controller) =20
* easy to understand with no confusion
* is compliant with draft-ietf-mpls-spring-entropy-label-10

G/

-----Original Message-----
From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]=20
Sent: Wednesday, June 13, 2018 08:05
To: Van De Velde, Gunter (Nokia - BE/Antwerp) <gunter.van_de_velde@nokia.co=
m>; idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Hi Gunter,

The difference in IGP signalling seems to be because the ELC is a capabilit=
y which is advertised differently than ERLD which is a limit. Are you sayin=
g that ELC does not have value by itself without the ERLD?

IMHO it makes sense to retain ELC as capability of the router (as specified=
 in the IGP specs) and position ERLD as a MSD sub-type for indicating the l=
imit. This way we have the flexibility of signalling ERLD both per node and=
 per ingress link/LC level.

Thanks,
Ketan

-----Original Message-----
From: Idr <idr-bounces@ietf.org> On Behalf Of Van De Velde, Gunter (Nokia -=
 BE/Antwerp)
Sent: 12 June 2018 19:28
To: idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)

In LSR WG the following drafts document the signaling of ELC and RLD:
* draft-ietf-ospf-mpls-elc
* draft-ietf-isis-mpls-elc

When exporting this information using BGP-LS encoding to a controller, ther=
e is need for BGP-LS extension by means of new TLVs.

BGP-LS is signaling ERLD (entropy capable readable label depth) ISIS/OSPF i=
s signaling individually ELC and RLD

I was working upon the IANA section, and discovered some inconsistency that=
 should be addressed:
* Why is IGP signaling individual ELC and RLD? ERLD is what was decided upo=
n (https://tools.ietf.org/html/draft-ietf-mpls-spring-entropy-label-10)
* What are the plans to request IANA code points for these drafts?
* (E)RLD seems to have meaning only from NODE perspective, (I assume that L=
INK ERLD is not of any value at all, is that a correct assumption?)

G/


-----Original Message-----
From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of internet-drafts@ietf.o=
rg
Sent: Tuesday, June 12, 2018 15:25
To: i-d-announce@ietf.org
Cc: idr@ietf.org
Subject: [Idr] I-D Action: draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt


A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : Signalling ERLD using BGP-LS
        Authors         : Gunter Van de Velde
                          Wim Henderickx
                          Matthew Bocci
                          Keyur Patel
	Filename        : draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt
	Pages           : 6
	Date            : 2018-06-12

Abstract:
   This document defines the attribute encoding to use for BGP-LS to
   expose ERLD "Entropy capable Readable Label Depth" from a node to a
   centralised controller (PCE/SDN).



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-rld/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-rld-02
https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-ls-segment-routing=
-rld-02

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-idr-bgp-ls-segment-routing-r=
ld-02


Please note that it may take a couple of minutes from the time of submissio=
n 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/

_______________________________________________
Idr mailing list
Idr@ietf.org
https://www.ietf.org/mailman/listinfo/idr

_______________________________________________
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https://www.ietf.org/mailman/listinfo/idr


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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: "Van De Velde, Gunter (Nokia - BE/Antwerp)" <gunter.van_de_velde@nokia.com>, "idr@ietf.org" <idr@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: Signalling ERLD (ISIS, OSPF and BGP-LS)
Thread-Index: AdQCVS4zJNJrYGL7RvyJWFnJWJ9mLgAhqsxQAAPpAwAAAcpz8A==
Date: Wed, 13 Jun 2018 08:45:26 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/L_yX4PXeJR_qYmgwQhFopeuXI0A>
Subject: Re: [Lsr] Signalling ERLD (ISIS, OSPF and BGP-LS)
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Hi Gunter,

In that case, I concur with you that option (2) is better than the others. =
My only difference in opinion is that ERLD not have its own separate TLV bu=
t instead get advertised as a new MSD sub-type - it is just a different enc=
oding.

Thanks,
Ketan

-----Original Message-----
From: Van De Velde, Gunter (Nokia - BE/Antwerp) <gunter.van_de_velde@nokia.=
com>=20
Sent: 13 June 2018 13:55
To: Ketan Talaulikar (ketant) <ketant@cisco.com>; idr@ietf.org; lsr@ietf.or=
g; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Indeed, the debate that made BGP-LS to go down the ERLD path is of pragmati=
c motivation.

The major Readable Label Depth use-case is entropy. Hence, if the ERLD TLV =
is available, then ELC can be implicitly assumed. No pragmatic reason to si=
gnal separately, as it just make things more complex then should be.=20

>From a holistic perspective having something similar, yet different, in bot=
h IGP and BGP-LS encoding seems to make little sense and only bring confusi=
on (router/controller implementers and network operators).=20

The ways to address this in IGP and BGP-LS going forward:
1) do nothing and leave all as it is (it has potential to create massive co=
nfusion)
2) only signal ERLD TLV in IGP and BGP
3) signal ELC TLV and RLD TLV (unclear pragmatic value of explicit signalin=
g of ELC TLV compared to option (2))
4) signal ELC TLV, RLD TLV and ERLD TLV (it has all, but is much much more =
complex as option (2))

I believe that option (2) is the best option:
* it bring the needed readable label depth value to operators
* most simple solution for implementers (routers and controller)
* easy to understand with no confusion
* is compliant with draft-ietf-mpls-spring-entropy-label-10

G/

-----Original Message-----
From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]=20
Sent: Wednesday, June 13, 2018 08:05
To: Van De Velde, Gunter (Nokia - BE/Antwerp) <gunter.van_de_velde@nokia.co=
m>; idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Hi Gunter,

The difference in IGP signalling seems to be because the ELC is a capabilit=
y which is advertised differently than ERLD which is a limit. Are you sayin=
g that ELC does not have value by itself without the ERLD?

IMHO it makes sense to retain ELC as capability of the router (as specified=
 in the IGP specs) and position ERLD as a MSD sub-type for indicating the l=
imit. This way we have the flexibility of signalling ERLD both per node and=
 per ingress link/LC level.

Thanks,
Ketan

-----Original Message-----
From: Idr <idr-bounces@ietf.org> On Behalf Of Van De Velde, Gunter (Nokia -=
 BE/Antwerp)
Sent: 12 June 2018 19:28
To: idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)

In LSR WG the following drafts document the signaling of ELC and RLD:
* draft-ietf-ospf-mpls-elc
* draft-ietf-isis-mpls-elc

When exporting this information using BGP-LS encoding to a controller, ther=
e is need for BGP-LS extension by means of new TLVs.

BGP-LS is signaling ERLD (entropy capable readable label depth) ISIS/OSPF i=
s signaling individually ELC and RLD

I was working upon the IANA section, and discovered some inconsistency that=
 should be addressed:
* Why is IGP signaling individual ELC and RLD? ERLD is what was decided upo=
n (https://tools.ietf.org/html/draft-ietf-mpls-spring-entropy-label-10)
* What are the plans to request IANA code points for these drafts?
* (E)RLD seems to have meaning only from NODE perspective, (I assume that L=
INK ERLD is not of any value at all, is that a correct assumption?)

G/


-----Original Message-----
From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of internet-drafts@ietf.o=
rg
Sent: Tuesday, June 12, 2018 15:25
To: i-d-announce@ietf.org
Cc: idr@ietf.org
Subject: [Idr] I-D Action: draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt


A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : Signalling ERLD using BGP-LS
        Authors         : Gunter Van de Velde
                          Wim Henderickx
                          Matthew Bocci
                          Keyur Patel
	Filename        : draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt
	Pages           : 6
	Date            : 2018-06-12

Abstract:
   This document defines the attribute encoding to use for BGP-LS to
   expose ERLD "Entropy capable Readable Label Depth" from a node to a
   centralised controller (PCE/SDN).



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-rld/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-rld-02
https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-ls-segment-routing=
-rld-02

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-idr-bgp-ls-segment-routing-r=
ld-02


Please note that it may take a couple of minutes from the time of submissio=
n 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/

_______________________________________________
Idr mailing list
Idr@ietf.org
https://www.ietf.org/mailman/listinfo/idr

_______________________________________________
Idr mailing list
Idr@ietf.org
https://www.ietf.org/mailman/listinfo/idr


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From: "Van De Velde, Gunter (Nokia - BE/Antwerp)" <gunter.van_de_velde@nokia.com>
To: "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "idr@ietf.org" <idr@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: Signalling ERLD (ISIS, OSPF and BGP-LS)
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Date: Wed, 13 Jun 2018 09:10:22 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/5s43X-zIavuANUHyz4LlbjbUuBM>
Subject: Re: [Lsr] Signalling ERLD (ISIS, OSPF and BGP-LS)
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It is desirable that same understanding of TLVs ([ELC, RLD] or [ERLD]) are =
signaled for ISIS, OSPF and BGP-LS.=20

If the WG's can manage to agree upon a decision (option1/2/3 or 4), then ne=
xt, have a look into how to encode the TLV so that we have a clean technolo=
gical solution space.

G/

-----Original Message-----
From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]=20
Sent: Wednesday, June 13, 2018 10:45
To: Van De Velde, Gunter (Nokia - BE/Antwerp) <gunter.van_de_velde@nokia.co=
m>; idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Hi Gunter,

In that case, I concur with you that option (2) is better than the others. =
My only difference in opinion is that ERLD not have its own separate TLV bu=
t instead get advertised as a new MSD sub-type - it is just a different enc=
oding.

Thanks,
Ketan

-----Original Message-----
From: Van De Velde, Gunter (Nokia - BE/Antwerp) <gunter.van_de_velde@nokia.=
com>=20
Sent: 13 June 2018 13:55
To: Ketan Talaulikar (ketant) <ketant@cisco.com>; idr@ietf.org; lsr@ietf.or=
g; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Indeed, the debate that made BGP-LS to go down the ERLD path is of pragmati=
c motivation.

The major Readable Label Depth use-case is entropy. Hence, if the ERLD TLV =
is available, then ELC can be implicitly assumed. No pragmatic reason to si=
gnal separately, as it just make things more complex then should be.=20

>From a holistic perspective having something similar, yet different, in bot=
h IGP and BGP-LS encoding seems to make little sense and only bring confusi=
on (router/controller implementers and network operators).=20

The ways to address this in IGP and BGP-LS going forward:
1) do nothing and leave all as it is (it has potential to create massive co=
nfusion)
2) only signal ERLD TLV in IGP and BGP
3) signal ELC TLV and RLD TLV (unclear pragmatic value of explicit signalin=
g of ELC TLV compared to option (2))
4) signal ELC TLV, RLD TLV and ERLD TLV (it has all, but is much much more =
complex as option (2))

I believe that option (2) is the best option:
* it bring the needed readable label depth value to operators
* most simple solution for implementers (routers and controller)
* easy to understand with no confusion
* is compliant with draft-ietf-mpls-spring-entropy-label-10

G/

-----Original Message-----
From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]=20
Sent: Wednesday, June 13, 2018 08:05
To: Van De Velde, Gunter (Nokia - BE/Antwerp) <gunter.van_de_velde@nokia.co=
m>; idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Hi Gunter,

The difference in IGP signalling seems to be because the ELC is a capabilit=
y which is advertised differently than ERLD which is a limit. Are you sayin=
g that ELC does not have value by itself without the ERLD?

IMHO it makes sense to retain ELC as capability of the router (as specified=
 in the IGP specs) and position ERLD as a MSD sub-type for indicating the l=
imit. This way we have the flexibility of signalling ERLD both per node and=
 per ingress link/LC level.

Thanks,
Ketan

-----Original Message-----
From: Idr <idr-bounces@ietf.org> On Behalf Of Van De Velde, Gunter (Nokia -=
 BE/Antwerp)
Sent: 12 June 2018 19:28
To: idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)

In LSR WG the following drafts document the signaling of ELC and RLD:
* draft-ietf-ospf-mpls-elc
* draft-ietf-isis-mpls-elc

When exporting this information using BGP-LS encoding to a controller, ther=
e is need for BGP-LS extension by means of new TLVs.

BGP-LS is signaling ERLD (entropy capable readable label depth) ISIS/OSPF i=
s signaling individually ELC and RLD

I was working upon the IANA section, and discovered some inconsistency that=
 should be addressed:
* Why is IGP signaling individual ELC and RLD? ERLD is what was decided upo=
n (https://tools.ietf.org/html/draft-ietf-mpls-spring-entropy-label-10)
* What are the plans to request IANA code points for these drafts?
* (E)RLD seems to have meaning only from NODE perspective, (I assume that L=
INK ERLD is not of any value at all, is that a correct assumption?)

G/


-----Original Message-----
From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of internet-drafts@ietf.o=
rg
Sent: Tuesday, June 12, 2018 15:25
To: i-d-announce@ietf.org
Cc: idr@ietf.org
Subject: [Idr] I-D Action: draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt


A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : Signalling ERLD using BGP-LS
        Authors         : Gunter Van de Velde
                          Wim Henderickx
                          Matthew Bocci
                          Keyur Patel
	Filename        : draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt
	Pages           : 6
	Date            : 2018-06-12

Abstract:
   This document defines the attribute encoding to use for BGP-LS to
   expose ERLD "Entropy capable Readable Label Depth" from a node to a
   centralised controller (PCE/SDN).



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-rld/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-rld-02
https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-ls-segment-routing=
-rld-02

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-idr-bgp-ls-segment-routing-r=
ld-02


Please note that it may take a couple of minutes from the time of submissio=
n 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: Christian Hopps <chopps@chopps.org>
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Subject: [Lsr] IPR Poll [Re: WG Last Call for draft-ietf-isis-segment-routing-extensions-16]
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Authors,

The original WGLC requested the authors indicate if they were aware of any additional IPR. This seems to have gotten lost in a bunch of comments that followed. I failed to ask again during this second WGLC. So...

Can each author reply to this email (and the list) indicating if they are aware of any *new* IPR on this document. Currently declared related IPR:

https://datatracker.ietf.org/ipr/search/?submit=draft&id=draft-ietf-isis-segment-routing-msd

Thanks,
Chris.

Christian Hopps <chopps@chopps.org> writes:

> Hi Folks,
>
> We are starting a new 2 week WG last call on
>
>  https://datatracker.ietf.org/doc/draft-ietf-isis-segment-routing-extensions/
>
> as there have (*) been some changes to the document since our last WG last call last year. Here's the diff.
>    https://www.ietf.org/rfcdiff?url1=draft-ietf-isis-segment-routing-extensions-12&url2=draft-ietf-isis-segment-routing-extensions-16
>
> Will end Monday May 7th.
>
> Thanks,
> Chris.
>
> (*) contrary to what you may have heard from folks at the mic in London. :)


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From: Christian Hopps <chopps@chopps.org>
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Subject: [Lsr] IPR Poll draft-ietf-isis-segment-routing-msd.
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[Sigh, I quoted the wrong email and mixed things up -- thanks Bruno!]

Authors,

The original WGLC requested the authors indicate if they were aware of any additional IPR. This seems to have gotten lost in a bunch of comments that followed.

Can each author reply to this email (and the list) indicating if they are aware of any *new* IPR on this document. Currently declared related IPR:

https://datatracker.ietf.org/ipr/search/?submit=draft&id=draft-ietf-isis-segment-routing-msd

Thanks,
Chris.


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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Christian Hopps <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>
CC: "draft-ietf-isis-segment-routing-msd@ietf.org" <draft-ietf-isis-segment-routing-msd@ietf.org>, "lsr-ads@ietf.org" <lsr-ads@ietf.org>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>
Thread-Topic: IPR Poll draft-ietf-isis-segment-routing-msd.
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I am not aware of any IPR (new, old, borrowed, or blue) related to this doc=
ument.

   Les


> -----Original Message-----
> From: Christian Hopps <chopps@chopps.org>
> Sent: Wednesday, June 13, 2018 6:38 AM
> To: lsr@ietf.org
> Cc: draft-ietf-isis-segment-routing-msd@ietf.org; lsr-ads@ietf.org; lsr-
> chairs@ietf.org
> Subject: IPR Poll draft-ietf-isis-segment-routing-msd.
>=20
> [Sigh, I quoted the wrong email and mixed things up -- thanks Bruno!]
>=20
> Authors,
>=20
> The original WGLC requested the authors indicate if they were aware of an=
y
> additional IPR. This seems to have gotten lost in a bunch of comments tha=
t
> followed.
>=20
> Can each author reply to this email (and the list) indicating if they are=
 aware
> of any *new* IPR on this document. Currently declared related IPR:
>=20
> https://datatracker.ietf.org/ipr/search/?submit=3Ddraft&id=3Ddraft-ietf-i=
sis-
> segment-routing-msd
>=20
> Thanks,
> Chris.


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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: "Van De Velde, Gunter (Nokia - BE/Antwerp)" <gunter.van_de_velde@nokia.com>, "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "idr@ietf.org" <idr@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: Signalling ERLD (ISIS, OSPF and BGP-LS)
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Date: Wed, 13 Jun 2018 15:42:14 +0000
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References: <AM5PR0701MB17290B271DD58F23E0E3EA86E07F0@AM5PR0701MB1729.eurprd07.prod.outlook.com> <741c5584debc4bc7821292de52f8d6c4@XCH-ALN-008.cisco.com> <AM5PR0701MB172929505908F164E3DCA377E07E0@AM5PR0701MB1729.eurprd07.prod.outlook.com> <5c494d4e76cf4fa1adcb695f4ee4b59e@XCH-ALN-008.cisco.com> <AM5PR0701MB1729C0A2324D84DBB71AA269E07E0@AM5PR0701MB1729.eurprd07.prod.outlook.com>
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Subject: Re: [Lsr] Signalling ERLD (ISIS, OSPF and BGP-LS)
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Gunter -

I strongly support Option #2 and strongly support Ketan's recommendation th=
at an MSD sub-type be used to advertise ERLD.
This is the unified framework that the MSD advertisement has been designed =
to support.

The following documents provide a unified definition of this mechanism:

https://datatracker.ietf.org/doc/draft-ietf-isis-segment-routing-msd/
https://datatracker.ietf.org/doc/draft-ietf-ospf-segment-routing-msd/
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-msd/

(The last one needs a refresh.)

If we can update the related ERLD documents to align I think we will have a=
n excellent solution.

 (Note: in the case of https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-=
ls-segment-routing-rld/ perhaps that can be combined with https://datatrack=
er.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-msd/  - but I leave t=
hat to the respective authors to work out.)

   Les



> -----Original Message-----
> From: Lsr <lsr-bounces@ietf.org> On Behalf Of Van De Velde, Gunter (Nokia
> - BE/Antwerp)
> Sent: Wednesday, June 13, 2018 2:10 AM
> To: Ketan Talaulikar (ketant) <ketant@cisco.com>; idr@ietf.org; lsr@ietf.=
org;
> spring@ietf.org
> Subject: Re: [Lsr] Signalling ERLD (ISIS, OSPF and BGP-LS)
>=20
> It is desirable that same understanding of TLVs ([ELC, RLD] or [ERLD]) ar=
e
> signaled for ISIS, OSPF and BGP-LS.
>=20
> If the WG's can manage to agree upon a decision (option1/2/3 or 4), then
> next, have a look into how to encode the TLV so that we have a clean
> technological solution space.
>=20
> G/
>=20
> -----Original Message-----
> From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]
> Sent: Wednesday, June 13, 2018 10:45
> To: Van De Velde, Gunter (Nokia - BE/Antwerp)
> <gunter.van_de_velde@nokia.com>; idr@ietf.org; lsr@ietf.org;
> spring@ietf.org
> Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)
>=20
> Hi Gunter,
>=20
> In that case, I concur with you that option (2) is better than the others=
. My
> only difference in opinion is that ERLD not have its own separate TLV but
> instead get advertised as a new MSD sub-type - it is just a different enc=
oding.
>=20
> Thanks,
> Ketan
>=20
> -----Original Message-----
> From: Van De Velde, Gunter (Nokia - BE/Antwerp)
> <gunter.van_de_velde@nokia.com>
> Sent: 13 June 2018 13:55
> To: Ketan Talaulikar (ketant) <ketant@cisco.com>; idr@ietf.org; lsr@ietf.=
org;
> spring@ietf.org
> Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)
>=20
> Indeed, the debate that made BGP-LS to go down the ERLD path is of
> pragmatic motivation.
>=20
> The major Readable Label Depth use-case is entropy. Hence, if the ERLD TL=
V
> is available, then ELC can be implicitly assumed. No pragmatic reason to =
signal
> separately, as it just make things more complex then should be.
>=20
> >From a holistic perspective having something similar, yet different, in =
both
> IGP and BGP-LS encoding seems to make little sense and only bring
> confusion (router/controller implementers and network operators).
>=20
> The ways to address this in IGP and BGP-LS going forward:
> 1) do nothing and leave all as it is (it has potential to create massive
> confusion)
> 2) only signal ERLD TLV in IGP and BGP
> 3) signal ELC TLV and RLD TLV (unclear pragmatic value of explicit signal=
ing of
> ELC TLV compared to option (2))
> 4) signal ELC TLV, RLD TLV and ERLD TLV (it has all, but is much much mor=
e
> complex as option (2))
>=20
> I believe that option (2) is the best option:
> * it bring the needed readable label depth value to operators
> * most simple solution for implementers (routers and controller)
> * easy to understand with no confusion
> * is compliant with draft-ietf-mpls-spring-entropy-label-10
>=20
> G/
>=20
> -----Original Message-----
> From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]
> Sent: Wednesday, June 13, 2018 08:05
> To: Van De Velde, Gunter (Nokia - BE/Antwerp)
> <gunter.van_de_velde@nokia.com>; idr@ietf.org; lsr@ietf.org;
> spring@ietf.org
> Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)
>=20
> Hi Gunter,
>=20
> The difference in IGP signalling seems to be because the ELC is a capabil=
ity
> which is advertised differently than ERLD which is a limit. Are you sayin=
g that
> ELC does not have value by itself without the ERLD?
>=20
> IMHO it makes sense to retain ELC as capability of the router (as specifi=
ed in
> the IGP specs) and position ERLD as a MSD sub-type for indicating the lim=
it.
> This way we have the flexibility of signalling ERLD both per node and per
> ingress link/LC level.
>=20
> Thanks,
> Ketan
>=20
> -----Original Message-----
> From: Idr <idr-bounces@ietf.org> On Behalf Of Van De Velde, Gunter (Nokia
> - BE/Antwerp)
> Sent: 12 June 2018 19:28
> To: idr@ietf.org; lsr@ietf.org; spring@ietf.org
> Subject: [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)
>=20
> In LSR WG the following drafts document the signaling of ELC and RLD:
> * draft-ietf-ospf-mpls-elc
> * draft-ietf-isis-mpls-elc
>=20
> When exporting this information using BGP-LS encoding to a controller, th=
ere
> is need for BGP-LS extension by means of new TLVs.
>=20
> BGP-LS is signaling ERLD (entropy capable readable label depth) ISIS/OSPF=
 is
> signaling individually ELC and RLD
>=20
> I was working upon the IANA section, and discovered some inconsistency
> that should be addressed:
> * Why is IGP signaling individual ELC and RLD? ERLD is what was decided u=
pon
> (https://tools.ietf.org/html/draft-ietf-mpls-spring-entropy-label-10)
> * What are the plans to request IANA code points for these drafts?
> * (E)RLD seems to have meaning only from NODE perspective, (I assume that
> LINK ERLD is not of any value at all, is that a correct assumption?)
>=20
> G/
>=20
>=20
> -----Original Message-----
> From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of internet-
> drafts@ietf.org
> Sent: Tuesday, June 12, 2018 15:25
> To: i-d-announce@ietf.org
> Cc: idr@ietf.org
> Subject: [Idr] I-D Action: draft-ietf-idr-bgp-ls-segment-routing-rld-02.t=
xt
>=20
>=20
> A New Internet-Draft is available from the on-line Internet-Drafts direct=
ories.
> This draft is a work item of the Inter-Domain Routing WG of the IETF.
>=20
>         Title           : Signalling ERLD using BGP-LS
>         Authors         : Gunter Van de Velde
>                           Wim Henderickx
>                           Matthew Bocci
>                           Keyur Patel
> 	Filename        : draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt
> 	Pages           : 6
> 	Date            : 2018-06-12
>=20
> Abstract:
>    This document defines the attribute encoding to use for BGP-LS to
>    expose ERLD "Entropy capable Readable Label Depth" from a node to a
>    centralised controller (PCE/SDN).
>=20
>=20
>=20
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-rl=
d/
>=20
> There are also htmlized versions available at:
> https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-rld-02
> https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-ls-segment-routi=
ng-
> rld-02
>=20
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-idr-bgp-ls-segment-routing=
-rld-
> 02
>=20
>=20
> Please note that it may take a couple of minutes from the time of submiss=
ion
> until the htmlized version and diff are available at tools.ietf.org.
>=20
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>=20
> _______________________________________________
> Idr mailing list
> Idr@ietf.org
> https://www.ietf.org/mailman/listinfo/idr
>=20
> _______________________________________________
> Idr mailing list
> Idr@ietf.org
> https://www.ietf.org/mailman/listinfo/idr
>=20
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr


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Date: Wed, 13 Jun 2018 10:31:10 -0700
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: Christian Hopps <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>
CC: <draft-ietf-isis-segment-routing-msd@ietf.org>, <lsr-ads@ietf.org>, <lsr-chairs@ietf.org>
Message-ID: <EB90A553-1FE4-485A-8DE3-F7EB124A7F47@gmail.com>
Thread-Topic: IPR Poll draft-ietf-isis-segment-routing-msd.
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Subject: Re: [Lsr] IPR Poll draft-ietf-isis-segment-routing-msd.
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Chris,

I'm not aware of any IPR outside of that already disclosed.

Thanks,
Jeff=20

Cheers,
Jeff
=EF=BB=BFOn 6/13/18, 06:37, "Christian Hopps" <chopps@chopps.org> wrote:

    [Sigh, I quoted the wrong email and mixed things up -- thanks Bruno!]
   =20
    Authors,
   =20
    The original WGLC requested the authors indicate if they were aware of =
any additional IPR. This seems to have gotten lost in a bunch of comments th=
at followed.
   =20
    Can each author reply to this email (and the list) indicating if they a=
re aware of any *new* IPR on this document. Currently declared related IPR:
   =20
    https://datatracker.ietf.org/ipr/search/?submit=3Ddraft&id=3Ddraft-ietf-isi=
s-segment-routing-msd
   =20
    Thanks,
    Chris.
   =20



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Date: Wed, 13 Jun 2018 14:09:22 -0700
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: "Les Ginsberg (ginsberg)" <ginsberg=40cisco.com@dmarc.ietf.org>, "Van De Velde, Gunter (Nokia - BE/Antwerp)" <gunter.van_de_velde@nokia.com>, "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "idr@ietf.org" <idr@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, "spring@ietf.org" <spring@ietf.org>
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Thread-Topic: [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)
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Subject: Re: [Lsr] [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)
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Gunter,

I have nothing to add to Les' comments, 100% agree.

Cheers,
Jeff
=EF=BB=BFOn 6/13/18, 08:42, "Idr on behalf of Les Ginsberg (ginsberg)" <idr-bounc=
es@ietf.org on behalf of ginsberg=3D40cisco.com@dmarc.ietf.org> wrote:

    Gunter -
   =20
    I strongly support Option #2 and strongly support Ketan's recommendatio=
n that an MSD sub-type be used to advertise ERLD.
    This is the unified framework that the MSD advertisement has been desig=
ned to support.
   =20
    The following documents provide a unified definition of this mechanism:
   =20
    https://datatracker.ietf.org/doc/draft-ietf-isis-segment-routing-msd/
    https://datatracker.ietf.org/doc/draft-ietf-ospf-segment-routing-msd/
    https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-=
msd/
   =20
    (The last one needs a refresh.)
   =20
    If we can update the related ERLD documents to align I think we will ha=
ve an excellent solution.
   =20
     (Note: in the case of https://datatracker.ietf.org/doc/draft-ietf-idr-=
bgp-ls-segment-routing-rld/ perhaps that can be combined with https://datatr=
acker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-msd/  - but I leave=
 that to the respective authors to work out.)
   =20
       Les
   =20
   =20
   =20
    > -----Original Message-----
    > From: Lsr <lsr-bounces@ietf.org> On Behalf Of Van De Velde, Gunter (N=
okia
    > - BE/Antwerp)
    > Sent: Wednesday, June 13, 2018 2:10 AM
    > To: Ketan Talaulikar (ketant) <ketant@cisco.com>; idr@ietf.org; lsr@i=
etf.org;
    > spring@ietf.org
    > Subject: Re: [Lsr] Signalling ERLD (ISIS, OSPF and BGP-LS)
    >=20
    > It is desirable that same understanding of TLVs ([ELC, RLD] or [ERLD]=
) are
    > signaled for ISIS, OSPF and BGP-LS.
    >=20
    > If the WG's can manage to agree upon a decision (option1/2/3 or 4), t=
hen
    > next, have a look into how to encode the TLV so that we have a clean
    > technological solution space.
    >=20
    > G/
    >=20
    > -----Original Message-----
    > From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]
    > Sent: Wednesday, June 13, 2018 10:45
    > To: Van De Velde, Gunter (Nokia - BE/Antwerp)
    > <gunter.van_de_velde@nokia.com>; idr@ietf.org; lsr@ietf.org;
    > spring@ietf.org
    > Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)
    >=20
    > Hi Gunter,
    >=20
    > In that case, I concur with you that option (2) is better than the ot=
hers. My
    > only difference in opinion is that ERLD not have its own separate TLV=
 but
    > instead get advertised as a new MSD sub-type - it is just a different=
 encoding.
    >=20
    > Thanks,
    > Ketan
    >=20
    > -----Original Message-----
    > From: Van De Velde, Gunter (Nokia - BE/Antwerp)
    > <gunter.van_de_velde@nokia.com>
    > Sent: 13 June 2018 13:55
    > To: Ketan Talaulikar (ketant) <ketant@cisco.com>; idr@ietf.org; lsr@i=
etf.org;
    > spring@ietf.org
    > Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)
    >=20
    > Indeed, the debate that made BGP-LS to go down the ERLD path is of
    > pragmatic motivation.
    >=20
    > The major Readable Label Depth use-case is entropy. Hence, if the ERL=
D TLV
    > is available, then ELC can be implicitly assumed. No pragmatic reason=
 to signal
    > separately, as it just make things more complex then should be.
    >=20
    > >From a holistic perspective having something similar, yet different,=
 in both
    > IGP and BGP-LS encoding seems to make little sense and only bring
    > confusion (router/controller implementers and network operators).
    >=20
    > The ways to address this in IGP and BGP-LS going forward:
    > 1) do nothing and leave all as it is (it has potential to create mass=
ive
    > confusion)
    > 2) only signal ERLD TLV in IGP and BGP
    > 3) signal ELC TLV and RLD TLV (unclear pragmatic value of explicit si=
gnaling of
    > ELC TLV compared to option (2))
    > 4) signal ELC TLV, RLD TLV and ERLD TLV (it has all, but is much much=
 more
    > complex as option (2))
    >=20
    > I believe that option (2) is the best option:
    > * it bring the needed readable label depth value to operators
    > * most simple solution for implementers (routers and controller)
    > * easy to understand with no confusion
    > * is compliant with draft-ietf-mpls-spring-entropy-label-10
    >=20
    > G/
    >=20
    > -----Original Message-----
    > From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]
    > Sent: Wednesday, June 13, 2018 08:05
    > To: Van De Velde, Gunter (Nokia - BE/Antwerp)
    > <gunter.van_de_velde@nokia.com>; idr@ietf.org; lsr@ietf.org;
    > spring@ietf.org
    > Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)
    >=20
    > Hi Gunter,
    >=20
    > The difference in IGP signalling seems to be because the ELC is a cap=
ability
    > which is advertised differently than ERLD which is a limit. Are you s=
aying that
    > ELC does not have value by itself without the ERLD?
    >=20
    > IMHO it makes sense to retain ELC as capability of the router (as spe=
cified in
    > the IGP specs) and position ERLD as a MSD sub-type for indicating the=
 limit.
    > This way we have the flexibility of signalling ERLD both per node and=
 per
    > ingress link/LC level.
    >=20
    > Thanks,
    > Ketan
    >=20
    > -----Original Message-----
    > From: Idr <idr-bounces@ietf.org> On Behalf Of Van De Velde, Gunter (N=
okia
    > - BE/Antwerp)
    > Sent: 12 June 2018 19:28
    > To: idr@ietf.org; lsr@ietf.org; spring@ietf.org
    > Subject: [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)
    >=20
    > In LSR WG the following drafts document the signaling of ELC and RLD:
    > * draft-ietf-ospf-mpls-elc
    > * draft-ietf-isis-mpls-elc
    >=20
    > When exporting this information using BGP-LS encoding to a controller=
, there
    > is need for BGP-LS extension by means of new TLVs.
    >=20
    > BGP-LS is signaling ERLD (entropy capable readable label depth) ISIS/=
OSPF is
    > signaling individually ELC and RLD
    >=20
    > I was working upon the IANA section, and discovered some inconsistenc=
y
    > that should be addressed:
    > * Why is IGP signaling individual ELC and RLD? ERLD is what was decid=
ed upon
    > (https://tools.ietf.org/html/draft-ietf-mpls-spring-entropy-label-10)
    > * What are the plans to request IANA code points for these drafts?
    > * (E)RLD seems to have meaning only from NODE perspective, (I assume =
that
    > LINK ERLD is not of any value at all, is that a correct assumption?)
    >=20
    > G/
    >=20
    >=20
    > -----Original Message-----
    > From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of internet-
    > drafts@ietf.org
    > Sent: Tuesday, June 12, 2018 15:25
    > To: i-d-announce@ietf.org
    > Cc: idr@ietf.org
    > Subject: [Idr] I-D Action: draft-ietf-idr-bgp-ls-segment-routing-rld-=
02.txt
    >=20
    >=20
    > A New Internet-Draft is available from the on-line Internet-Drafts di=
rectories.
    > This draft is a work item of the Inter-Domain Routing WG of the IETF.
    >=20
    >         Title           : Signalling ERLD using BGP-LS
    >         Authors         : Gunter Van de Velde
    >                           Wim Henderickx
    >                           Matthew Bocci
    >                           Keyur Patel
    > 	Filename        : draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt
    > 	Pages           : 6
    > 	Date            : 2018-06-12
    >=20
    > Abstract:
    >    This document defines the attribute encoding to use for BGP-LS to
    >    expose ERLD "Entropy capable Readable Label Depth" from a node to =
a
    >    centralised controller (PCE/SDN).
    >=20
    >=20
    >=20
    > The IETF datatracker status page for this draft is:
    > https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routin=
g-rld/
    >=20
    > There are also htmlized versions available at:
    > https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-rld=
-02
    > https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-ls-segment-r=
outing-
    > rld-02
    >=20
    > A diff from the previous version is available at:
    > https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-idr-bgp-ls-segment-routi=
ng-rld-
    > 02
    >=20
    >=20
    > Please note that it may take a couple of minutes from the time of sub=
mission
    > until the htmlized version and diff are available at tools.ietf.org.
    >=20
    > Internet-Drafts are also available by anonymous FTP at:
    > ftp://ftp.ietf.org/internet-drafts/
    >=20
    > _______________________________________________
    > Idr mailing list
    > Idr@ietf.org
    > https://www.ietf.org/mailman/listinfo/idr
    >=20
    > _______________________________________________
    > Idr mailing list
    > Idr@ietf.org
    > https://www.ietf.org/mailman/listinfo/idr
    >=20
    > _______________________________________________
    > Lsr mailing list
    > Lsr@ietf.org
    > https://www.ietf.org/mailman/listinfo/lsr
   =20
    _______________________________________________
    Idr mailing list
    Idr@ietf.org
    https://www.ietf.org/mailman/listinfo/idr
   =20



From nobody Wed Jun 13 15:05:11 2018
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From: <stephane.litkowski@orange.com>
To: "Van De Velde, Gunter (Nokia - BE/Antwerp)" <gunter.van_de_velde@nokia.com>, "Ketan Talaulikar (ketant)" <ketant@cisco.com>, "idr@ietf.org" <idr@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, "spring@ietf.org" <spring@ietf.org>
Thread-Topic: Signalling ERLD (ISIS, OSPF and BGP-LS)
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Date: Wed, 13 Jun 2018 22:05:03 +0000
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Subject: Re: [Lsr] Signalling ERLD (ISIS, OSPF and BGP-LS)
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Hi,

As defined in draft-ietf-mpls-spring-entropy-label, advertising an ERLD mea=
ns that the node is defacto ELC (so advertising ELC separately is not neces=
sary):

" The Entropy Readable Label Depth (ERLD) is defined as the number of
   labels a router can both:

   a.  Read in an MPLS packet received on its incoming interface(s)
       (starting from the top of the stack).

   b.  Use in its load-balancing function.

   The ERLD means that the router will perform load-balancing using the
   EL label if the EL is placed within the ERLD first labels.
"

"
To advertise an ERLD value, a SPRING router:

   o  MUST be entropy label capable and, as a consequence, MUST apply
      the dataplane procedures defined in [RFC6790].

   o  MUST be able to read an ELI/EL which is located within its ERLD
      value.

   o  MUST take into account this EL in its load-balancing function.
"


Brgds,


-----Original Message-----
From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Van De Velde, Gunter (=
Nokia - BE/Antwerp)
Sent: Wednesday, June 13, 2018 11:10
To: Ketan Talaulikar (ketant); idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: Re: [Lsr] Signalling ERLD (ISIS, OSPF and BGP-LS)

It is desirable that same understanding of TLVs ([ELC, RLD] or [ERLD]) are =
signaled for ISIS, OSPF and BGP-LS.=20

If the WG's can manage to agree upon a decision (option1/2/3 or 4), then ne=
xt, have a look into how to encode the TLV so that we have a clean technolo=
gical solution space.

G/

-----Original Message-----
From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]=20
Sent: Wednesday, June 13, 2018 10:45
To: Van De Velde, Gunter (Nokia - BE/Antwerp) <gunter.van_de_velde@nokia.co=
m>; idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Hi Gunter,

In that case, I concur with you that option (2) is better than the others. =
My only difference in opinion is that ERLD not have its own separate TLV bu=
t instead get advertised as a new MSD sub-type - it is just a different enc=
oding.

Thanks,
Ketan

-----Original Message-----
From: Van De Velde, Gunter (Nokia - BE/Antwerp) <gunter.van_de_velde@nokia.=
com>=20
Sent: 13 June 2018 13:55
To: Ketan Talaulikar (ketant) <ketant@cisco.com>; idr@ietf.org; lsr@ietf.or=
g; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Indeed, the debate that made BGP-LS to go down the ERLD path is of pragmati=
c motivation.

The major Readable Label Depth use-case is entropy. Hence, if the ERLD TLV =
is available, then ELC can be implicitly assumed. No pragmatic reason to si=
gnal separately, as it just make things more complex then should be.=20

>From a holistic perspective having something similar, yet different, in bo=
th IGP and BGP-LS encoding seems to make little sense and only bring confus=
ion (router/controller implementers and network operators).=20

The ways to address this in IGP and BGP-LS going forward:
1) do nothing and leave all as it is (it has potential to create massive co=
nfusion)
2) only signal ERLD TLV in IGP and BGP
3) signal ELC TLV and RLD TLV (unclear pragmatic value of explicit signalin=
g of ELC TLV compared to option (2))
4) signal ELC TLV, RLD TLV and ERLD TLV (it has all, but is much much more =
complex as option (2))

I believe that option (2) is the best option:
* it bring the needed readable label depth value to operators
* most simple solution for implementers (routers and controller)
* easy to understand with no confusion
* is compliant with draft-ietf-mpls-spring-entropy-label-10

G/

-----Original Message-----
From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]=20
Sent: Wednesday, June 13, 2018 08:05
To: Van De Velde, Gunter (Nokia - BE/Antwerp) <gunter.van_de_velde@nokia.co=
m>; idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Hi Gunter,

The difference in IGP signalling seems to be because the ELC is a capabilit=
y which is advertised differently than ERLD which is a limit. Are you sayin=
g that ELC does not have value by itself without the ERLD?

IMHO it makes sense to retain ELC as capability of the router (as specified=
 in the IGP specs) and position ERLD as a MSD sub-type for indicating the l=
imit. This way we have the flexibility of signalling ERLD both per node and=
 per ingress link/LC level.

Thanks,
Ketan

-----Original Message-----
From: Idr <idr-bounces@ietf.org> On Behalf Of Van De Velde, Gunter (Nokia -=
 BE/Antwerp)
Sent: 12 June 2018 19:28
To: idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)

In LSR WG the following drafts document the signaling of ELC and RLD:
* draft-ietf-ospf-mpls-elc
* draft-ietf-isis-mpls-elc

When exporting this information using BGP-LS encoding to a controller, ther=
e is need for BGP-LS extension by means of new TLVs.

BGP-LS is signaling ERLD (entropy capable readable label depth) ISIS/OSPF i=
s signaling individually ELC and RLD

I was working upon the IANA section, and discovered some inconsistency that=
 should be addressed:
* Why is IGP signaling individual ELC and RLD? ERLD is what was decided upo=
n (https://tools.ietf.org/html/draft-ietf-mpls-spring-entropy-label-10)
* What are the plans to request IANA code points for these drafts?
* (E)RLD seems to have meaning only from NODE perspective, (I assume that L=
INK ERLD is not of any value at all, is that a correct assumption?)

G/


-----Original Message-----
From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of internet-drafts@ietf.o=
rg
Sent: Tuesday, June 12, 2018 15:25
To: i-d-announce@ietf.org
Cc: idr@ietf.org
Subject: [Idr] I-D Action: draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt


A New Internet-Draft is available from the on-line Internet-Drafts director=
ies.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : Signalling ERLD using BGP-LS
        Authors         : Gunter Van de Velde
                          Wim Henderickx
                          Matthew Bocci
                          Keyur Patel
	Filename        : draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt
	Pages           : 6
	Date            : 2018-06-12

Abstract:
   This document defines the attribute encoding to use for BGP-LS to
   expose ERLD "Entropy capable Readable Label Depth" from a node to a
   centralised controller (PCE/SDN).



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-rld/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-rld-02
https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-ls-segment-routing=
-rld-02

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-idr-bgp-ls-segment-routing-r=
ld-02


Please note that it may take a couple of minutes from the time of submissio=
n 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/

_______________________________________________
Idr mailing list
Idr@ietf.org
https://www.ietf.org/mailman/listinfo/idr

_______________________________________________
Idr mailing list
Idr@ietf.org
https://www.ietf.org/mailman/listinfo/idr

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr

___________________________________________________________________________=
______________________________________________

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From nobody Thu Jun 14 11:10:49 2018
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From: Sam Aldrin <aldrin.ietf@gmail.com>
Date: Thu, 14 Jun 2018 11:10:29 -0700
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To: Jeff Tantsura <jefftant.ietf@gmail.com>
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Subject: Re: [Lsr] IPR Poll draft-ietf-isis-segment-routing-msd.
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I am not aware of any IPR against this draft, which was not already
disclosed.

Ssm

On Wed, Jun 13, 2018, 10:31 AM Jeff Tantsura <jefftant.ietf@gmail.com>
wrote:

> Chris,
>
> I'm not aware of any IPR outside of that already disclosed.
>
> Thanks,
> Jeff
>
> Cheers,
> Jeff
> =EF=BB=BFOn 6/13/18, 06:37, "Christian Hopps" <chopps@chopps.org> wrote:
>
>     [Sigh, I quoted the wrong email and mixed things up -- thanks Bruno!]
>
>     Authors,
>
>     The original WGLC requested the authors indicate if they were aware o=
f
> any additional IPR. This seems to have gotten lost in a bunch of comments
> that followed.
>
>     Can each author reply to this email (and the list) indicating if they
> are aware of any *new* IPR on this document. Currently declared related I=
PR:
>
>
> https://datatracker.ietf.org/ipr/search/?submit=3Ddraft&id=3Ddraft-ietf-i=
sis-segment-routing-msd
>
>     Thanks,
>     Chris.
>
>
>
>

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<div dir=3D"auto"><div>I am not aware of any IPR against this draft, which =
was not already disclosed.</div><div dir=3D"auto"><br></div><div dir=3D"aut=
o">Ssm<br><br><div class=3D"gmail_quote" dir=3D"auto"><div dir=3D"ltr">On W=
ed, Jun 13, 2018, 10:31 AM Jeff Tantsura &lt;<a href=3D"mailto:jefftant.iet=
f@gmail.com">jefftant.ietf@gmail.com</a>&gt; wrote:<br></div><blockquote cl=
ass=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;p=
adding-left:1ex">Chris,<br>
<br>
I&#39;m not aware of any IPR outside of that already disclosed.<br>
<br>
Thanks,<br>
Jeff <br>
<br>
Cheers,<br>
Jeff<br>
=EF=BB=BFOn 6/13/18, 06:37, &quot;Christian Hopps&quot; &lt;<a href=3D"mail=
to:chopps@chopps.org" target=3D"_blank" rel=3D"noreferrer">chopps@chopps.or=
g</a>&gt; wrote:<br>
<br>
=C2=A0 =C2=A0 [Sigh, I quoted the wrong email and mixed things up -- thanks=
 Bruno!]<br>
<br>
=C2=A0 =C2=A0 Authors,<br>
<br>
=C2=A0 =C2=A0 The original WGLC requested the authors indicate if they were=
 aware of any additional IPR. This seems to have gotten lost in a bunch of =
comments that followed.<br>
<br>
=C2=A0 =C2=A0 Can each author reply to this email (and the list) indicating=
 if they are aware of any *new* IPR on this document. Currently declared re=
lated IPR:<br>
<br>
=C2=A0 =C2=A0 <a href=3D"https://datatracker.ietf.org/ipr/search/?submit=3D=
draft&amp;id=3Ddraft-ietf-isis-segment-routing-msd" rel=3D"noreferrer noref=
errer" target=3D"_blank">https://datatracker.ietf.org/ipr/search/?submit=3D=
draft&amp;id=3Ddraft-ietf-isis-segment-routing-msd</a><br>
<br>
=C2=A0 =C2=A0 Thanks,<br>
=C2=A0 =C2=A0 Chris.<br>
<br>
<br>
<br>
</blockquote></div></div></div>

--0000000000005b0fba056e9e0411--


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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
To: Christian Hopps <chopps@chopps.org>, "lsr@ietf.org" <lsr@ietf.org>
CC: "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>, "lsr-ads@ietf.org" <lsr-ads@ietf.org>
Thread-Topic: [Lsr] WG Last Call for draft-ietf-lsr-isis-rfc7810bis-00
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WG chairs -

Can we consider WG last call completed? (It has been more than 3 weeks...)

Would really like to get this small but important correction published ASAP=
.
Thanx.

    Les


> -----Original Message-----
> From: Lsr <lsr-bounces@ietf.org> On Behalf Of Christian Hopps
> Sent: Wednesday, May 23, 2018 8:29 AM
> To: lsr@ietf.org
> Cc: lsr-chairs@ietf.org; lsr-ads@ietf.org; chopps@chopps.org
> Subject: [Lsr] WG Last Call for draft-ietf-lsr-isis-rfc7810bis-00
>=20
> Hi Folks,
>=20
> We're starting a 2 week WG Last Call on
>=20
>     https://datatracker.ietf.org/doc/draft-ietf-lsr-isis-rfc7810bis/
>=20
> Please raise any objections or comments before Jun 6th, 2018.
>=20
> Thanks,
> Chris.
>=20
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr


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From: Uma Chunduri <umac.ietf@gmail.com>
Date: Fri, 15 Jun 2018 09:21:09 -0700
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Subject: Re: [Lsr] draft-ietf-isis-segment-routing-extensions-16 - Shepherd review comments
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Les, Co-authors and WG,

Though there is a scope for minor improvements in the text, I am fine  if
you choose not to update further -  based on the responses below.

I have no further comments and initial version of the write-up has been
updated.


BR,

--
Uma C.

On Wed, Jun 13, 2018 at 12:03 AM, Les Ginsberg (ginsberg) <
ginsberg@cisco.com> wrote:

> Uma =E2=80=93
>
>
>
> Responses inline.
>
>
>
> *From:* Uma Chunduri <umac.ietf@gmail.com>
> *Sent:* Tuesday, June 12, 2018 11:09 AM
> *To:* Les Ginsberg (ginsberg) <ginsberg@cisco.com>
> *Cc:* lsr@ietf.org; draft-ietf-isis-segment-routing-extensions@ietf.org;
> lsr-chairs@ietf.org; lsr-ads@ietf.org
> *Subject:* Re: draft-ietf-isis-segment-routing-extensions-16 - Shepherd
> review comments
>
>
>
> Les,
>
>
>
> Thanks for your quick response and changes in the document. Please find m=
y
> further response below* [Uma]:*
>
>
>
> --
>
> Uma C.
>
>
>
> On Mon, Jun 11, 2018 at 10:00 PM, Les Ginsberg (ginsberg) <
> ginsberg@cisco.com> wrote:
>
> Uma =E2=80=93
>
>
>
> Thanx for the prompt review.
>
>
>
>  2. Section 2.1
>
>
>
> a. "The 'Prefix SID' MUST   be unique within a given IGP domain (when the
> L-flag is not set)."
>
>
>
>    I see this is conflicting with what's been defined in
> https://tools.ietf.org/html/draft-ietf-spring-segment-routing-14,
>
> section 3.3 -
>
>    "Within an anycast group, all routers in an SR domain MUST
> advertise  the same prefix with the same SID value."
>
>
>
>    If you see otherwise please explain why?
>
>
>
> *[Les:] This is a misunderstanding on your part.*
>
> *An anycast prefix may be advertised by multiple nodes, but the Prefix SI=
D
> associated with the prefix is the same regardless of which node advertise=
s
> it. So there is no contradiction/conflict here.*
>
>
>
>
>
> *[Uma]:  I understood the intention.*
>
>
>
> *This doc says - **"The 'Prefix SID' MUST   be unique within a given IGP
> domain (when the L-flag is not set)." *
>
> *And it won't give any exception for "anycast group" either in the text o=
r
> through reference to  draft-ietf-spring-segment-routing-14
> <https://tools.ietf.org/html/draft-ietf-spring-segment-routing-14>.*
>
>
>
>
>
> *[Les:] If both Node A and Node B advertise (1.1.1.1/32
> <http://1.1.1.1/32>, SID 100) this is NOT a conflict. This is expected
> behavior for an anycast address.*
>
>
>
> *Examples of conflicts:*
>
>
>
> *Node A (1.1.1.1/32 <http://1.1.1.1/32>, SID 100)*
>
> *Node B (1.1.1.1/32 <http://1.1.1.1/32>, SID 200)*
>
> *(Different SIDs for the same prefix)*
>
>
>
> *Node A (1.1.1.1/32 <http://1.1.1.1/32>, SID 100)*
>
> *Node B (2.2.2.2/32 <http://2.2.2.2/32>, SID 100)*
>
> *(Same SID for different prefixes)*
>
>
>
>
>
> b. "A 4 octet index defining.."
>
> What happens  to the computed label value if the index is of 4 octets
> value? I am asking this as index can have 4 octets but the eventual label
> (SRGB offset + index) would be only 20 bits.
>
> Can you point (if any)  references to https://tools.ietf.org/html/
> draft-ietf-spring-segment-routing-mpls appropriate sections -  is this is
> addressed there?
>
>
>
> *[Les:] See
> https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls-14#sec=
tion-2.4
> <https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls-14#se=
ction-2.4>
> (emphasis added):*
>
>
>
> *=E2=80=9C 0 =3D< I < size. If the index "I" does not satisfy the previou=
s*
>
> *      inequality, **then the label cannot be calculated**.=E2=80=9D*
>
>
>
> *[Uma]: Thanks for the pointer. I am fine with keeping this at a common
> place but this document  needs a generic reference specifically for some =
of
> the conflict/error conditions to that.*
>
>
>
> *[Les:] WE have deliberately kept any discussion of handling of conflicts
> (now identified as =E2=80=9Ccollisions=E2=80=9D)  out of the IGP drafts. =
Please see
> https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls-14#sec=
tion-2.5
> <https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mpls-14#se=
ction-2.5>
> for discussion of this topic =E2=80=93 which is not protocol specific.*
>
>
>
>
>
> 3. Section 2.2.1
>
>
>
> a. "F-Flag: Address-Family flag..."
>
>
>
>      Not sure why this has to do with encapsulation? What happens if
> native IPv4/IPv6 data packet is using this SID with out any encapsulation=
?
> Could you please clarify.
>
>
>
> *[Les:] When the packet is forwarded over the specified outgoing interfac=
e
> it will either have an IPv4 encapsulation or an IPv6 encapsulation i.e.,
> the payload is encapsulated in the afi specific L3 protocol. *
>
> *This does not mean that a new AFI specific header is imposed.*
>
>
>
>
>
> *[Uma]: Thanks.  I didn't expect payload encapsulation with L3 in IS-IS
> document. I see this is derived from the base TLV where this sub-TLV
> belongs to (22/222/223 etc.). This sounded like additional encap and henc=
e
> my comment.*
>
>
>
> *But one of my larger point here is why a sub-TLV has to specify/define
> AF. This is the property of the associated TLV/MT-aware TLV.*
>
> *I understand this could be too late to change here but this additional
> information should not conflict with base while usage. *
>
> *One incorrect usage *example* of this sub-TLV with AF unset (IPv4) in TL=
V
> 222 with MT-ID=3D2 (IPv6).*
>
>
>
> *As it stands this combinations valid/allowed. Perhaps some text around
> this would be helpful.*
>
>
>
> *[Les:] Consider the case of single topology IPv6 support. Here, a single
> IS Neighbor advertisement is used in support of IPv4 and IPv6. The
> indication of which SID is used for which address-family is therefore
> required.*
>
> *Although it is a common practice to have a 1-1 mapping between topologie=
s
> and address-families, this is not required. 1-1 mapping  is commonly
> assumed because of the reserved MTIDs defined in RFC 5120, but a single
> topology may be used to support multiple address families. MTID 0 support
> for IPv6 is the most common example.*
>
>
>
>
>
> 4. Section 2.2.2
>
>
>
> a. Nit: V and L flags: Content is duplicated and perhaps it can instead
> refer to section 2.2.1
>
>
>
>
>
> *[Les:] The text says:*
>
> *=E2=80=9C where F, B, V, L, S and P flags are defined in Section 2.2.1.=
=E2=80=9D*
>
>
>
> *???*
>
>
>
> *[Uma]: Sorry - I should have been more specific. Was referring to
> duplicated text in Section 2.2.1 and 2.2.2*
>
>
>
>  "
>
>       *  A 3 octet local label where the 20 rightmost bits are used for
>
>          encoding the label value.  In this case the V and L flags MUST
>
>          be set.
>
>
>
>       *  A 4 octet index defining the offset in the SID/Label space
>
>          advertised by this router using the encodings defined in
>
>          Section 3.1 <https://tools.ietf.org/html/draft-ietf-isis-segment=
-routing-extensions-16#section-3.1>.  In this case V and L flags MUST be un=
set."
>
>
>
> *[Les:] What you suggest could be done. IMO it does not improve the reada=
bility of the document.*
>
> *If there is some consensus for your suggestion I am willing to make such=
 a change =E2=80=93 but at this point I prefer to leave the text as is.*
>
>
>
>
>
> 5. Section 3.2 and Section 2.1
>
>
>
>     Could you please clarify what is preferred if multiple prefix-sids
> with different algorithm values are advertised for the same SID value?
>
>
>
> *[Les:] There is no =E2=80=9Cpreference=E2=80=9D here. In order to have a=
lgorithm specific
> forwarding entries we MUST have different SIDs for each algorithm. A rout=
er
> will use the SID which matches the algorithm associated with the forwardi=
ng
> entry.*
>
>
>
> *[Uma]: ..and IMO, this should be specified. *
>
>
>
> *[Les:] I am not clear on what you think needs to specified. As the notio=
n
> of =E2=80=9Cpreference=E2=80=9D is not relevant why would we introduce it=
?*
>
>
>
>    Les
>
>
>

--000000000000928cc3056eb09af3
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Les, Co-authors and WG,</div><div><br></div>Though th=
ere is a scope for minor improvements in the text, I am fine=C2=A0 if you c=
hoose not to update further -=C2=A0 based on the responses below.<div><br><=
/div><div>I have no further comments and initial version of the write-up ha=
s been updated.</div><div><br></div><div><br></div><div>BR,</div><div><br><=
/div><div>--</div><div>Uma C.</div></div><div class=3D"gmail_extra"><br><di=
v class=3D"gmail_quote">On Wed, Jun 13, 2018 at 12:03 AM, Les Ginsberg (gin=
sberg) <span dir=3D"ltr">&lt;<a href=3D"mailto:ginsberg@cisco.com" target=
=3D"_blank">ginsberg@cisco.com</a>&gt;</span> wrote:<br><blockquote class=
=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padd=
ing-left:1ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"m_-5240399223697989572WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Uma =E2=80=93<u></u><u></u></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Responses inline.<u></u><u></u></span=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></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><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,sans-serif">From:</span></b><span style=3D"font-size:11.0pt;=
font-family:&quot;Calibri&quot;,sans-serif"> Uma Chunduri &lt;<a href=3D"ma=
ilto:umac.ietf@gmail.com" target=3D"_blank">umac.ietf@gmail.com</a>&gt;
<br>
<b>Sent:</b> Tuesday, June 12, 2018 11:09 AM<span class=3D""><br>
<b>To:</b> Les Ginsberg (ginsberg) &lt;<a href=3D"mailto:ginsberg@cisco.com=
" target=3D"_blank">ginsberg@cisco.com</a>&gt;<br>
</span><b>Cc:</b> <a href=3D"mailto:lsr@ietf.org" target=3D"_blank">lsr@iet=
f.org</a>; <a href=3D"mailto:draft-ietf-isis-segment-routing-extensions@iet=
f.org" target=3D"_blank">draft-ietf-isis-segment-<wbr>routing-extensions@ie=
tf.org</a>; <a href=3D"mailto:lsr-chairs@ietf.org" target=3D"_blank">lsr-ch=
airs@ietf.org</a>; <a href=3D"mailto:lsr-ads@ietf.org" target=3D"_blank">ls=
r-ads@ietf.org</a><br>
<b>Subject:</b> Re: draft-ietf-isis-segment-<wbr>routing-extensions-16 - Sh=
epherd review comments<u></u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div><span class=3D"">
<p class=3D"MsoNormal">Les,<u></u><u></u></p>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Thanks for your quick response and changes in the do=
cument. Please find my further response below<b> [Uma]:</b><u></u><u></u></=
p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">--<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Uma C.<u></u><u></u></p>
</div>
</span><div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div><span class=3D"">
<p class=3D"MsoNormal">On Mon, Jun 11, 2018 at 10:00 PM, Les Ginsberg (gins=
berg) &lt;<a href=3D"mailto:ginsberg@cisco.com" target=3D"_blank">ginsberg@=
cisco.com</a>&gt; wrote:<u></u><u></u></p>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Uma =E2=80=93</span><u></u><u></u></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Thanx for the prompt review.</span><u=
></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">=C2=A02. Section 2.1</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">a. &quot;The &#39;Prefix SID&#39; MUST =C2=A0=C2=A0=
be unique within a given IGP domain (when the L-flag is not set).&quot;</sp=
an><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">=C2=A0=C2=A0 I see this is conflicting with what&#3=
9;s been defined in
<a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-14=
" target=3D"_blank">
https://tools.ietf.org/html/<wbr>draft-ietf-spring-segment-<wbr>routing-14<=
/a>, </span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"=
>section 3.3 -</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in">
<span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"=
>=C2=A0=C2=A0 &quot;Within an anycast group, all routers in an SR domain MU=
ST advertise=C2=A0=C2=A0the same prefix with the same SID value.&quot;</spa=
n><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">=C2=A0 =C2=A0If you see otherwise please explain wh=
y?</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">[Les:] This is a misunderstandi=
ng on your part.</span></i></b><u></u><u></u></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">An anycast prefix may be advert=
ised by multiple nodes, but the Prefix SID associated with the
 prefix is the same regardless of which node advertises it. So there is no =
contradiction/conflict here.</span></i></b><u></u><u></u></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0</span></i></b><u></u><u>=
</u></p>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><b>[Uma]:=C2=A0 I understood the intention.</b><u></=
u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><b>This doc says -=C2=A0</b><b><span style=3D"font-s=
ize:11.0pt;font-family:&quot;Calibri&quot;,sans-serif;background:white">&qu=
ot;The &#39;Prefix SID&#39; MUST =C2=A0=C2=A0be unique within a given IGP d=
omain (when the L-flag is not set).&quot;=C2=A0</span></b><u></u><u></u></p=
>
</div>
<div>
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,sans-serif;background:white">And it won&#39;t give any excep=
tion for &quot;anycast group&quot; either in the text or through reference =
to=C2=A0
<a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-14=
" target=3D"_blank">
<span style=3D"color:#1155cc">draft-ietf-spring-segment-<wbr>routing-14</sp=
an></a>.</span></b><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</span><div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">[Les:] If both Node A and Node =
B advertise (<a href=3D"http://1.1.1.1/32" target=3D"_blank">1.1.1.1/32</a>=
, SID 100) this is NOT a conflict. This is expected behavior for an anycast=
 address.<u></u><u></u></span></i></b></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></i>=
</b></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">Examples of conflicts:<u></u><u=
></u></span></i></b></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></i>=
</b></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">Node A (<a href=3D"http://1.1.1=
.1/32" target=3D"_blank">1.1.1.1/32</a>, SID 100)<u></u><u></u></span></i><=
/b></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">Node B (<a href=3D"http://1.1.1=
.1/32" target=3D"_blank">1.1.1.1/32</a>, SID 200)<u></u><u></u></span></i><=
/b></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">(Different SIDs for the same pr=
efix)<u></u><u></u></span></i></b></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></i>=
</b></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">Node A (<a href=3D"http://1.1.1=
.1/32" target=3D"_blank">1.1.1.1/32</a>, SID 100)<u></u><u></u></span></i><=
/b></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">Node B (<a href=3D"http://2.2.2=
.2/32" target=3D"_blank">2.2.2.2/32</a>, SID 100)<u></u><u></u></span></i><=
/b></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">(Same SID for different prefixe=
s)<u></u><u></u></span></i></b></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
</div><span class=3D"">
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in">
<div>
<div>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">b. &quot;A 4 octet index defining..&quot;</span><u>=
</u><u></u></p>
<p class=3D"MsoNormal" style=3D"text-indent:9.0pt">
<span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"=
>What happens=C2=A0 to the computed label value if the index is of 4 octets=
 value? I am asking this as index can have 4 octets but the eventual label =
(SRGB offset + index) would be only 20 bits.
</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"text-indent:9.0pt">
<span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-serif"=
>Can you point (if any)=C2=A0 references to
<a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mp=
ls" target=3D"_blank">
https://tools.ietf.org/html/<wbr>draft-ietf-spring-segment-<wbr>routing-mpl=
s</a> appropriate sections -=C2=A0 is this is addressed there?</span><u></u=
><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">[Les:] See
<a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mp=
ls-14#section-2.4" target=3D"_blank">
https://tools.ietf.org/html/<wbr>draft-ietf-spring-segment-<wbr>routing-mpl=
s-14#section-2.4</a> (emphasis added):</span></i></b><u></u><u></u></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0</span></i></b><u></u><u>=
</u></p>
<p class=3D"MsoNormal" style=3D"margin-left:5.25pt">
<b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,sans-=
serif;color:#1f497d">=E2=80=9C 0 =3D&lt; I &lt; size. If the index &quot;I&=
quot; does not satisfy the previous</span></i></b><u></u><u></u></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
inequality,
</span></i></b><b><i><span style=3D"font-size:11.0pt;font-family:&quot;Cali=
bri&quot;,sans-serif;color:red">then the label cannot be calculated</span><=
/i></b><b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot=
;,sans-serif;color:#1f497d">.=E2=80=9D</span></i></b><u></u><u></u></p>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><b>[Uma]: Thanks for the pointer. I am fine with kee=
ping this at a common place but this document=C2=A0 needs a generic referen=
ce specifically for some of the conflict/error conditions to that.</b><u></=
u><u></u></p>
</div>
</span><div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">[Les:] WE have deliberately kep=
t any discussion of handling of conflicts (now identified as =E2=80=9Ccolli=
sions=E2=80=9D) =C2=A0out of the IGP drafts. Please see
<a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-mp=
ls-14#section-2.5" target=3D"_blank">
https://tools.ietf.org/html/<wbr>draft-ietf-spring-segment-<wbr>routing-mpl=
s-14#section-2.5</a> for discussion of this topic =E2=80=93 which is not pr=
otocol specific.<u></u><u></u></span></i></b></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
</div><span class=3D"">
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in">
<div>
<div>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">3. Section 2.2.1</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">=C2=A0=C2=A0=C2=A0
</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">a. &quot;F-Flag: Address-Family flag...&quot;
</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">=C2=A0=C2=A0=C2=A0=C2=A0 Not sure why this has to d=
o with encapsulation? What happens if native IPv4/IPv6 data packet is using=
 this SID
 with out any encapsulation? Could you please clarify.</span><u></u><u></u>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">[Les:] When the packet is forwa=
rded over the specified outgoing interface it will either have
 an IPv4 encapsulation or an IPv6 encapsulation i.e., the payload is encaps=
ulated in the afi specific L3 protocol.
</span></i></b><u></u><u></u></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">This does not mean that a new A=
FI specific header is imposed.</span></i></b><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">=C2=A0=C2=A0</span><u></u><u></u></p>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><b>[Uma]: Thanks.=C2=A0 I didn&#39;t expect payload =
encapsulation with L3 in IS-IS document. I see this is derived from the bas=
e TLV where this sub-TLV belongs to (22/222/223 etc.). This sounded like ad=
ditional encap and hence my comment.</b><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><b>But one of my larger point here is why a sub-TLV =
has to specify/define AF. This is the property of the associated TLV/MT-awa=
re TLV.</b><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><b>I understand this could be too late to change her=
e but this additional information should not conflict with base while usage=
.=C2=A0</b><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><b>One incorrect usage *example* of this sub-TLV wit=
h AF unset (IPv4) in TLV 222 with MT-ID=3D2 (IPv6).</b><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><b>As it stands this combinations valid/allowed. Per=
haps some text around this would be helpful.</b><u></u><u></u></p>
</div>
</span><div>
<p class=3D"MsoNormal"><span style=3D"color:#1f497d"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">[Les:] Consider the case of sin=
gle topology IPv6 support. Here, a single IS Neighbor advertisement is used=
 in support of IPv4 and IPv6. The indication of
 which SID is used for which address-family is therefore required.<u></u><u=
></u></span></i></b></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">Although it is a common practic=
e to have a 1-1 mapping between topologies and address-families, this is no=
t required. 1-1 mapping =C2=A0is commonly assumed because
 of the reserved MTIDs defined in RFC 5120, but a single topology may be us=
ed to support multiple address families. MTID 0 support for IPv6 is the mos=
t common example.<u></u><u></u></span></i></b></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
</div><span class=3D"">
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in">
<div>
<div>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">4. Section 2.2.2</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif">a. Nit: V and L flags: Content is duplicated and pe=
rhaps it can instead refer to section 2.2.1</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"color:#1f497d">=C2=A0</span><u></u><u=
></u></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">[Les:] The text says:</span></i=
></b><u></u><u></u></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">=E2=80=9C where F, B, V, L, S a=
nd P flags are defined in Section 2.2.1.=E2=80=9D</span></i></b><u></u><u><=
/u></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0</span></i></b><u></u><u>=
</u></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">???</span></i></b><u></u><u></u=
></p>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><b>[Uma]: Sorry - I should have been more specific. =
Was referring to duplicated text in Section 2.2.1 and 2.2.2</b><u></u><u></=
u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
</span><div><span class=3D"">
<p class=3D"MsoNormal">=C2=A0&quot; <u></u><u></u></p>
<pre><span style=3D"color:black">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0*=C2=
=A0 A 3 octet local label where the 20 rightmost bits are used for<u></u><u=
></u></span></pre>
<pre><span style=3D"color:black">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 encoding the label value.=C2=A0 In this case the V and L flags MUST<=
u></u><u></u></span></pre>
<pre><span style=3D"color:black">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 be set.<u></u><u></u></span></pre>
<pre><span style=3D"color:black"><u></u>=C2=A0<u></u></span></pre>
<pre><span style=3D"color:black">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 *=C2=A0 A 4=
 octet index defining the offset in the SID/Label space<u></u><u></u></span=
></pre>
<pre><span style=3D"color:black">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 advertised by this router using the encodings defined in<u></u><u></=
u></span></pre>
<pre><span style=3D"color:black">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 <a href=3D"https://tools.ietf.org/html/draft-ietf-isis-segment-routi=
ng-extensions-16#section-3.1" target=3D"_blank">Section 3.1</a>.=C2=A0 In t=
his case V and L flags MUST be unset.&quot;<u></u><u></u></span></pre>
<pre style=3D"break-before:page;text-decoration-style:initial;text-decorati=
on-color:initial"><span style=3D"color:#1f497d"><u></u>=C2=A0<u></u></span>=
</pre>
</span><pre><b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri=
&quot;,sans-serif;color:#1f497d">[Les:] What you suggest could be done. IMO=
 it does not improve the readability of the document.<u></u><u></u></span><=
/i></b></pre>
<pre><b><i><span style=3D"font-size:11.0pt;font-family:&quot;Calibri&quot;,=
sans-serif;color:#1f497d">If there is some consensus for your suggestion I =
am willing to make such a change =E2=80=93 but at this point I prefer to le=
ave the text as is.</span></i></b><span style=3D"font-size:11.0pt;font-fami=
ly:&quot;Calibri&quot;,sans-serif;color:#1f497d"><u></u><u></u></span></pre=
>
</div><span class=3D"">
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-right:0in">
<div>
<div>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">=C2=A0</span></i></b><u></u><u>=
</u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">=C2=A0</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">5. Section 3.2 and Section 2.1<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0 =C2=A0 Could you please clarify what is prefe=
rred if multiple prefix-sids with different algorithm values are advertised=
 for the same SID value?=C2=A0<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1f497d">=C2=A0</span><u></u><u=
></u></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">[Les:] There is no =E2=80=9Cpre=
ference=E2=80=9D here. In order to have algorithm specific forwarding entri=
es
 we MUST have different SIDs for each algorithm. A router will use the SID =
which matches the algorithm associated with the forwarding entry.</span></i=
></b><u></u><u></u></p>
</div>
</div>
</div>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><b>[Uma]: ..and IMO, this should be specified.=C2=A0=
</b><u></u><u></u></p>
</div>
</span><div>
<p class=3D"MsoNormal"><span style=3D"color:#1f497d"><u></u>=C2=A0<u></u></=
span></p>
<p class=3D"MsoNormal"><b><i><span style=3D"font-size:11.0pt;font-family:&q=
uot;Calibri&quot;,sans-serif;color:#1f497d">[Les:] I am not clear on what y=
ou think needs to specified. As the notion of =E2=80=9Cpreference=E2=80=9D =
is not relevant why would we introduce it?<span class=3D"HOEnZb"><font colo=
r=3D"#888888"><u></u><u></u></font></span></span></i></b></p><span class=3D=
"HOEnZb"><font color=3D"#888888">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
</font></span></div><span class=3D"HOEnZb"><font color=3D"#888888">
<div>
<p class=3D"MsoNormal"><b><i><span style=3D"color:#1f497d"></span></i></b><=
span style=3D"color:#1f497d">=C2=A0=C2=A0=C2=A0Les<u></u><u></u></span></p>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
</div>
</font></span></div>
</div>
</div>
</div>
</div>
</div>

</blockquote></div><br></div>

--000000000000928cc3056eb09af3--


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From: Uma Chunduri <umac.ietf@gmail.com>
Date: Fri, 15 Jun 2018 09:22:57 -0700
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To: Christian Hopps <chopps@chopps.org>
Cc: "lsr@ietf.org" <lsr@ietf.org>, lsr-chairs@ietf.org, lsr-ads@ietf.org,  draft-ietf-isis-segment-routing-msd@ietf.org
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Subject: Re: [Lsr] IPR Poll draft-ietf-isis-segment-routing-msd.
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I am not aware of any other IPRs on this draft other than what's been
already disclosed.

BR,

--
Uma C.

On Wed, Jun 13, 2018 at 6:37 AM, Christian Hopps <chopps@chopps.org> wrote:

> [Sigh, I quoted the wrong email and mixed things up -- thanks Bruno!]
>
> Authors,
>
> The original WGLC requested the authors indicate if they were aware of any
> additional IPR. This seems to have gotten lost in a bunch of comments that
> followed.
>
> Can each author reply to this email (and the list) indicating if they are
> aware of any *new* IPR on this document. Currently declared related IPR:
>
> https://datatracker.ietf.org/ipr/search/?submit=draft&id=dra
> ft-ietf-isis-segment-routing-msd
>
> Thanks,
> Chris.
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>

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<div dir=3D"ltr">I am not aware of any other IPRs on this draft other than =
what&#39;s been already disclosed.<div><br></div><div>BR,<br><div><br></div=
><div>--</div><div>Uma C.</div></div></div><div class=3D"gmail_extra"><br><=
div class=3D"gmail_quote">On Wed, Jun 13, 2018 at 6:37 AM, Christian Hopps =
<span dir=3D"ltr">&lt;<a href=3D"mailto:chopps@chopps.org" target=3D"_blank=
">chopps@chopps.org</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quo=
te" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"=
>[Sigh, I quoted the wrong email and mixed things up -- thanks Bruno!]<br>
<br>
Authors,<br>
<br>
The original WGLC requested the authors indicate if they were aware of any =
additional IPR. This seems to have gotten lost in a bunch of comments that =
followed.<br>
<br>
Can each author reply to this email (and the list) indicating if they are a=
ware of any *new* IPR on this document. Currently declared related IPR:<br>
<br>
<a href=3D"https://datatracker.ietf.org/ipr/search/?submit=3Ddraft&amp;id=
=3Ddraft-ietf-isis-segment-routing-msd" rel=3D"noreferrer" target=3D"_blank=
">https://datatracker.ietf.org/i<wbr>pr/search/?submit=3Ddraft&amp;id=3Ddra=
<wbr>ft-ietf-isis-segment-routing-<wbr>msd</a><br>
<br>
Thanks,<br>
Chris.<br>
<br>
______________________________<wbr>_________________<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/l<wbr>istinfo/lsr</a><br>
</blockquote></div><br></div>

--000000000000f6559f056eb0a065--


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Subject: [Lsr] I-D Action: draft-ietf-ospf-te-link-attr-reuse-04.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           : OSPF Link Traffic Engineering (TE) Attribute Reuse
        Authors         : Peter Psenak
                          Acee Lindem
                          Les Ginsberg
                          Wim Henderickx
                          Jeff Tantsura
                          Hannes Gredler
                          John Drake
	Filename        : draft-ietf-ospf-te-link-attr-reuse-04.txt
	Pages           : 19
	Date            : 2018-06-15

Abstract:
   Various link attributes have been defined in OSPF in the context of
   the MPLS Traffic Engineering (TE) and GMPLS.  Many of these link
   attributes can be used for applications other than MPLS Traffic
   Engineering or GMPLS.  This document defines how to distribute such
   attributes in OSPFv2 and OSPFv3 for applications other than MPLS
   Traffic Engineering or GMPLS.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-ospf-te-link-attr-reuse/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-ospf-te-link-attr-reuse-04
https://datatracker.ietf.org/doc/html/draft-ietf-ospf-te-link-attr-reuse-04

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-ospf-te-link-attr-reuse-04


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Subject: [Lsr] I-D Action: draft-ietf-isis-segment-routing-extensions-17.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 Extensions for Segment Routing
        Authors         : Stefano Previdi
                          Les Ginsberg
                          Clarence Filsfils
                          Ahmed Bashandy
                          Hannes Gredler
                          Stephane Litkowski
                          Bruno Decraene
                          Jeff Tantsura
	Filename        : draft-ietf-isis-segment-routing-extensions-17.txt
	Pages           : 35
	Date            : 2018-06-15

Abstract:
   Segment Routing (SR) allows for a flexible definition of end-to-end
   paths within IGP topologies by encoding paths as sequences of
   topological sub-paths, called "segments".  These segments are
   advertised by the link-state routing protocols (IS-IS and OSPF).

   This draft describes the necessary IS-IS extensions that need to be
   introduced for Segment Routing operating on an MPLS data-plane.



The IETF datatracker status page for this draft is:
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A diff from the previous version is available at:
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From: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
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CC: "lsr@ietf.org" <lsr@ietf.org>, "draft-ietf-isis-segment-routing-extensions@ietf.org" <draft-ietf-isis-segment-routing-extensions@ietf.org>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>, "lsr-ads@ietf.org" <lsr-ads@ietf.org>
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To: Uma Chunduri <umac.ietf@gmail.com>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: [Lsr] IPR Poll on draft-ietf-isis-segment-routing-extensions-16 (Shepherd write-up)
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From nobody Sat Jun 16 04:53:09 2018
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Christian Hopps has requested publication of draft-ietf-isis-segment-routing-msd-12 as Proposed Standard on behalf of the LSR working group.

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From: "Ketan Talaulikar (ketant)" <ketant@cisco.com>
To: "Acee Lindem (acee)" <acee=40cisco.com@dmarc.ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, "draft-ietf-ospf-lls-interface-id@ietf.orig" <draft-ietf-ospf-lls-interface-id@ietf.orig>
Thread-Topic: OSPF LLS Extensions for Local Interface ID Advertisement - draft-ietf-ospf-lls-interface-id-02
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Date: Mon, 18 Jun 2018 15:31:47 +0000
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From nobody Mon Jun 18 08:48:19 2018
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Date: Mon, 18 Jun 2018 17:48:11 +0200
From: Peter Psenak <ppsenak@cisco.com>
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Subject: Re: [Lsr] OSPF LLS Extensions for Local Interface ID Advertisement - draft-ietf-ospf-lls-interface-id-02
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I am not aware of any IPR that applies to this draft.

thanks,
Peter

On 18/06/18 17:24 , Acee Lindem (acee) wrote:
> Authors,  LSR WG,
>
> This mail is to start the Working Group Last Call IPR poll on the
> subject document.
>
> Are you aware of any IPR that applies to draft-ietf-ospf-lls-interface-id?
>
> If so, has this IPR been disclosed in compliance with IETF IPR rules
> (see RFCs 3979, 4879, 3669 and 5378 for more details).
>
> There are currently no IPR disclosures against
> draft-ietf-ospf-lls-interface-id.
>
> If you are listed as a document author or contributor please respond to
> this email regardless of whether or not you are aware of any relevant
> IPR. *The response needs to be sent to the LSR WG mailing list. The
> document will not advance to the next stage until a response has been
> received from each author and contributor.
>
> If you are on the LSR WG email list but are not listed as an author or
> contributor, then please explicitly respond only if you are aware of any
> IPR that has not yet been disclosed in conformance with IETF rules.
>
> Thanks,
>
> Acee
>
>
>
> _______________________________________________
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From: "Acee Lindem (acee)" <acee@cisco.com>
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Thread-Topic: Working Group Last Call for OSPF LLS Extensions for Local Interface ID Advertisement - draft-ietf-ospf-lls-interface-id-02
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From: Padmadevi Pillay Esnault <padma@huawei.com>
To: Peter Psenak <ppsenak=40cisco.com@dmarc.ietf.org>, "Acee Lindem (acee)" <acee=40cisco.com@dmarc.ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, "draft-ietf-ospf-lls-interface-id@ietf.orig" <draft-ietf-ospf-lls-interface-id@ietf.orig>
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Thread-Topic: [Lsr] OSPF LLS Extensions for Local Interface ID Advertisement - draft-ietf-ospf-lls-interface-id-02
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From: "Naiming Shen (naiming)" <naiming@cisco.com>
To: "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: I-D Action: draft-shen-isis-spine-leaf-ext-06.txt
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Date: Mon, 18 Jun 2018 20:30:15 +0000
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Thread-Topic: [Lsr] WG Last Call for draft-ietf-lsr-isis-rfc7810bis-00
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From nobody Mon Jun 18 15:31:09 2018
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Subject: [Lsr] IPR poll for draft-ietf-isis-reverse-metric-10
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Hi Authors,

Can you please respond (including the mailing list) indicating if you are aware of any IPR relating to draft-ietf-isis-reverse-metric?

Thanks,
Chris.


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From: "Naiming Shen (naiming)" <naiming@cisco.com>
To: Christian Hopps <chopps@chopps.org>
CC: "draft-ietf-isis-reverse-metric@ietf.org" <draft-ietf-isis-reverse-metric@ietf.org>, "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>, "lsr-ads@ietf.org" <lsr-ads@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: [Lsr] IPR poll for draft-ietf-isis-reverse-metric-10
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Date: Mon, 18 Jun 2018 22:38:29 +0000
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Subject: Re: [Lsr] IPR poll for draft-ietf-isis-reverse-metric-10
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From nobody Mon Jun 18 17:22:22 2018
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Date: Tue, 19 Jun 2018 02:22:15 +0200 (CEST)
From: Mikael Abrahamsson <swmike@swm.pp.se>
To: Christian Hopps <chopps@chopps.org>
cc: draft-ietf-isis-reverse-metric@ietf.org,  "lsr-chairs@ietf.org" <lsr-chairs@ietf.org>,  "lsr-ads@ietf.org" <lsr-ads@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>
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Subject: Re: [Lsr] IPR poll for draft-ietf-isis-reverse-metric-10
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On Mon, 18 Jun 2018, Christian Hopps wrote:

> Hi Authors,
>
> Can you please respond (including the mailing list) indicating if you are 
> aware of any IPR relating to draft-ietf-isis-reverse-metric?

I am not aware of any IPR related to the isis reverse metric draft.

-- 
Mikael Abrahamsson    email: swmike@swm.pp.se


From nobody Mon Jun 18 22:08:58 2018
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--_000_57a674890d8b43e2a81a6a69442aa892XCHALN008ciscocom_--


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Date: Tue, 19 Jun 2018 10:35:48 +0200
From: Peter Psenak <ppsenak@cisco.com>
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Subject: Re: [Lsr] Working Group Last Call for OSPF LLS Extensions for Local Interface ID Advertisement - draft-ietf-ospf-lls-interface-id-02
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Hi Acee,

On 18/06/18 20:51 , Acee Lindem (acee) wrote:
> Speaking as WG member, I support publication of the subject document. I
> have the following comments:
>
>  1. The normative text saying that the TLV MUST be included needs to be
>     changed from section 3.1. I’m sure you didn’t mean this since LLS
>     itself isn’t mandatory and this isn’t backward compatible.

changed to SHOULD.

>  2. Add a reference to RFC 8379 to section 2 or a new section indicating
>     that this mechanism suffers from many of the same shortcomings as
>     using OSPF TE LSAs.

RFC8379 specifies how to advertise the local/remote interface ID for the 
purpose of identifying the link by the remote routers. It does not 
suggest to use the Extended Link Opaque LSA as a discovery mechanism to 
find out what is the interface ID on the remote side of the link.


>  3. Remove RFC 5340 from the references as it is not referenced.

removed.

thanks,
Peter
>
> I’m also send  a couple editorial suggestions off list.
>
> Thanks,
> Acee
>
> *From: *Lsr <lsr-bounces@ietf.org> on behalf of "Acee Lindem (acee)"
> <acee=40cisco.com@dmarc.ietf.org>
> *Date: *Monday, June 18, 2018 at 12:07 PM
> *To: *"lsr@ietf.org" <lsr@ietf.org>
> *Subject: *[Lsr] Working Group Last Call for OSPF LLS Extensions for
> Local Interface ID Advertisement - draft-ietf-ospf-lls-interface-id-02
>
> This begins an LSR WG last call for the subject draft. Please send your
>
> comments to this list prior to 12:00 AM GMT, July 3^rd , 2018.
>
> Thanks,
>
> Acee
>
>
>
> _______________________________________________
> Lsr mailing list
> Lsr@ietf.org
> https://www.ietf.org/mailman/listinfo/lsr
>


From nobody Tue Jun 19 04:31:36 2018
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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 LLS Extensions for Local Interface ID Advertisement
        Authors         : Peter Psenak
                          Ketan Jivan Talaulikar
                          Wim Henderickx
                          Padma Pillay-Esnault
	Filename        : draft-ietf-ospf-lls-interface-id-03.txt
	Pages           : 6
	Date            : 2018-06-19

Abstract:
   This draft describes the extensions to OSPF link-local signaling to
   advertise the Local Interface Identifier.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-ospf-lls-interface-id/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-ospf-lls-interface-id-03
https://datatracker.ietf.org/doc/html/draft-ietf-ospf-lls-interface-id-03

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-ospf-lls-interface-id-03


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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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/9yhDauXGbqCqFdGJdD-Fjld2p9s>
Subject: [Lsr] A question about Mirror SID and its advertisement using IS-IS
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Hi all,
I have a question about Mirror SID as defined in the SR Architecture<https=
://tools.ietf.org/html/draft-ietf-spring-segment-routing-15> draft and its=
 advertisement defined in the IS-IS extensions for SR<https://datatracker.=
ietf.org/doc/draft-ietf-isis-segment-routing-extensions/> draft.

Mirror SID is defined in Section 5.1 of the SR Architecture draft as follo=
wing:
5.1<https://tools.ietf.org/html/draft-ietf-spring-segment-routing-15#secti=
on-5.1>.  IGP Mirroring Context Segment


   One use case for a Binding Segment is to provide support for an IGP
   node to advertise its ability to process traffic originally destined
   to another IGP node, called the Mirrored node and identified by an IP
   address or a Node-SID, provided that a "Mirroring Context" segment be
   inserted in the segment list prior to any service segment local to
   the mirrored node.

   When a given node B wants to provide egress node A protection, it

   advertises a segment identifying node's A context.  Such segment is

   called "Mirror Context Segment" and identified by the Mirror SID.



   The Mirror SID is advertised using the binding segment defined in SR

   IGP protocol extensions [I-D.ietf-isis-segment-routing-extensions<https=
://tools.ietf.org/html/draft-ietf-spring-segment-routing-15#ref-I-D.ietf-i=
sis-segment-routing-extensions>] .



   In the event of a failure, a point of local repair (PLR) diverting

   traffic from A to B does a PUSH of the Mirror SID on the protected

   traffic.  B, when receiving the traffic with the Mirror SID as the

   active segment, uses that segment and processes underlying segments

   in the context of A.

Please note that these definitions do not mention SR Mapping Server or any=
 such thing.

At the same time, the IS-IS Extensions for SR draft only mentions mirror c=
ontext in Section 2.4 that says:

2.4<https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions=
-17#section-2.4>.  SID/Label Binding TLV





   The SID/Label Binding TLV MAY be originated by any router in an IS-IS

   domain.



   The SID/Label Binding TLV is used to advertise prefixes to SID/Label

   mappings.  This functionality is called the Segment Routing Mapping

   Server (SRMS).  The behavior of the SRMS is defined in

   [I-D.ietf-spring-segment-routing-ldp-interop<https://tools.ietf.org/htm=
l/draft-ietf-isis-segment-routing-extensions-17#ref-I-D.ietf-spring-segmen=
t-routing-ldp-interop>].
...
2.4.1<https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensio=
ns-17#section-2.4.1>.  Flags





   Flags: 1 octet field of following flags:



    0 1 2 3 4 5 6 7

   +-+-+-+-+-+-+-+-+

   |F|M|S|D|A|     |

   +-+-+-+-+-+-+-+-+



   where:



      F-Flag: Address Family flag.  If unset, then the Prefix carries an

      IPv4 Prefix.  If set then the Prefix carries an IPv6 Prefix.



      M-Flag: Mirror Context flag.  Set if the advertised SID

      corresponds to a mirrored context.  The use of the M flag is

      described in [I-D.ietf-spring-segment-routing<https://tools.ietf.org=
/html/draft-ietf-isis-segment-routing-extensions-17#ref-I-D.ietf-spring-se=
gment-routing>].

...

This seems to imply that mirrored context is related to the SRMS - but, to=
 the best of my understanding, these are completely unrelated.
Please note also that the SR Architecture draft says that the Mirroring Co=
ntext SID is a segment that identifies the node, and not any prefix. And, =
of course the SR Architecture draft does not describe usage of any flags.

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 Mirror SID as defined in th=
e <a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing=
-15">
SR Architecture</a> draft and its advertisement defined in the <a href=3D"=
https://datatracker.ietf.org/doc/draft-ietf-isis-segment-routing-extension=
s/">
IS-IS extensions for SR</a> draft.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Mirror SID is defined in Section 5.1 of the SR Arch=
itecture draft as following:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-=
alt:auto;mso-line-height-alt:0pt">
<a name=3D"section-5.1"></a><a href=3D"https://tools.ietf.org/html/draft-i=
etf-spring-segment-routing-15#section-5.1"><span style=3D"mso-bookmark:&qu=
ot;section-5\.1&quot;"><b><span style=3D"font-size:10.0pt;font-family:&quo=
t;Courier New&quot;;color:black">5.1</span></b></span><span style=3D"mso-b=
ookmark:&quot;section-5\.1&quot;"></span></a><span style=3D"mso-bookmark:&=
quot;section-5\.1&quot;"></span><b><span style=3D"font-size:10.0pt;font-fa=
mily:&quot;Courier New&quot;;color:black">.&nbsp;
 IGP Mirroring Context Segment<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp; One use case for a Binding Segm=
ent is to provide support for an IGP<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp; node to advertise its ability t=
o process traffic originally destined<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp; to another IGP node, called the=
 Mirrored node and identified by an IP<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp; address or a Node-SID, provided=
 that a &quot;Mirroring Context&quot; segment be<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp; inserted in the segment list pr=
ior to any service segment local to<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp; the mirrored node.<o:p></o:p></=
span></p>
<pre><span style=3D"color:black">&nbsp;&nbsp; When a given node B wants to=
 provide egress node A protection, it<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; advertises a segment identif=
ying node's A context.&nbsp; Such segment is<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; called &quot;Mirror Context =
Segment&quot; and identified by the Mirror SID.<o:p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; The Mirror SID is advertised=
 using the binding segment defined in SR<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; IGP protocol extensions [<a =
href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-15#r=
ef-I-D.ietf-isis-segment-routing-extensions" title=3D"&quot;IS-IS Extensio=
ns for Segment Routing&quot;">I-D.ietf-isis-segment-routing-extensions</a>=
] .<o:p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; In the event of a failure, a=
 point of local repair (PLR) diverting<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; traffic from A to B does a P=
USH of the Mirror SID on the protected<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; traffic.&nbsp; B, when recei=
ving the traffic with the Mirror SID as the<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; active segment, uses that se=
gment and processes underlying segments<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; in the context of A.<o:p></o=
:p></span></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Please note that these definitions do not mention <=
span style=3D"background:yellow;mso-highlight:yellow">
SR Mapping Server</span> or any such thing.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">At the same time, the IS-IS Extensions for SR draft=
 only mentions mirror context in Section 2.4 that says:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<h3 style=3D"mso-line-height-alt:0pt"><a name=3D"section-2.4"></a><a href=3D=
"https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions-17=
#section-2.4"><span style=3D"mso-bookmark:&quot;section-2\.4&quot;"><span =
style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;color:black"=
>2.4</span></span><span style=3D"mso-bookmark:&quot;section-2\.4&quot;"></=
span></a><span style=3D"mso-bookmark:&quot;section-2\.4&quot;"></span><spa=
n style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;color:blac=
k">.&nbsp;
 SID/Label Binding TLV<o:p></o:p></span></h3>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; The SID/Label Binding TLV MA=
Y be originated by any router in an IS-IS<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; domain.<o:p></o:p></span></p=
re>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; <span style=3D"background:ye=
llow;mso-highlight:yellow">The SID/Label Binding TLV is used to advertise =
prefixes to SID/Label<o:p></o:p></span></span></pre>
<pre><span style=3D"color:black;background:yellow;mso-highlight:yellow">&n=
bsp;&nbsp; mappings.&nbsp; This functionality is called the Segment Routin=
g Mapping<o:p></o:p></span></pre>
<pre><span style=3D"color:black;background:yellow;mso-highlight:yellow">&n=
bsp;&nbsp; Server (SRMS).</span><span style=3D"color:black">&nbsp; The beh=
avior of the SRMS is defined in<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; [<a href=3D"https://tools.ie=
tf.org/html/draft-ietf-isis-segment-routing-extensions-17#ref-I-D.ietf-spr=
ing-segment-routing-ldp-interop" title=3D"&quot;Segment Routing interworki=
ng=20with LDP&quot;">I-D.ietf-spring-segment-routing-ldp-interop</a>].<o:p=
></o:p></span></pre>
<p class=3D"MsoNormal">...<o:p></o:p></p>
<h4 style=3D"mso-line-height-alt:0pt"><a name=3D"section-2.4.1"></a><a hre=
f=3D"https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extension=
s-17#section-2.4.1"><span style=3D"mso-bookmark:&quot;section-2\.4\.1&quot=
;"><span style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;col=
or:black">2.4.1</span></span><span style=3D"mso-bookmark:&quot;section-2\.=
4\.1&quot;"></span></a><span style=3D"mso-bookmark:&quot;section-2\.4\.1&q=
uot;"></span><span style=3D"font-size:10.0pt;font-family:&quot;Courier New=
&quot;;color:black">.&nbsp;
 Flags<o:p></o:p></span></h4>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; Flags: 1 octet field of foll=
owing flags:<o:p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp; 0 1 2 3 4 5 6 7<o:p></=
o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43=
;-&#43;-&#43;-&#43;-&#43;<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; |F|M|S|D|A|&nbsp;&nbsp;&nbsp=
;&nbsp; |<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43=
;-&#43;-&#43;-&#43;-&#43;<o:p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; where:<o:p></o:p></span></pr=
e>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; F-Flag: Ad=
dress Family flag.&nbsp; If unset, then the Prefix carries an<o:p></o:p></=
span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; IPv4 Prefi=
x.&nbsp; If set then the Prefix carries an IPv6 Prefix.<o:p></o:p></span><=
/pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; M-Flag: Mi=
rror Context flag.&nbsp; Set if the advertised SID<o:p></o:p></span></pre>=

<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; correspond=
s to a mirrored context.&nbsp; The use of the M flag is<o:p></o:p></span><=
/pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; described =
in [<a href=3D"https://tools.ietf.org/html/draft-ietf-isis-segment-routing=
-extensions-17#ref-I-D.ietf-spring-segment-routing" title=3D"&quot;Segment=
 Routing Architecture&quot;">I-D.ietf-spring-segment-routing</a>].<o:p></o=
:p></span></pre>
<pre><span style=3D"color:black">...<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">This seems to imply that mirrored context is relate=
d to the SRMS &#8211; but, to the best of my understanding, these are comp=
letely unrelated.
<o:p></o:p></p>
<p class=3D"MsoNormal">Please note also that the SR Architecture draft say=
s that the Mirroring Context SID is a segment that identifies the node, an=
d not any prefix. And, of course the SR Architecture draft does not descri=
be usage of any flags.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">What (if anything) did I miss?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p><=
/p>
<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>
<BR>
This e-mail message is intended for the recipient only and contains inform=
ation which is <BR>
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece=
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From: "Clarence Filsfils (cfilsfil)" <cfilsfil@cisco.com>
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Subject: Re: [Lsr] IPR Poll on draft-ietf-isis-segment-routing-extensions-16 (Shepherd write-up)
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I'm not aware of any IPR that has not been previously disclosed

Cheers,
Clarence

On 11/06/2018 21:18, Uma Chunduri wrote:
> Dear All,
> 
> Are you aware of any IPR that applies to
> https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions-16 ?
> 
> Sending this email as suggested by LSR chairs - as this was not noticed 
> during/around WGLC.
> 
> ===
> If so, has this IPR been disclosed in compliance with IETF IPR rules
> (see RFCs 3979, 4879, 3669 and 5378 for more details).
> 
> If you are listed as a document author or contributor please respond
> to this email regardless of whether or not you are aware of any
> relevant IPR. *The response needs to be sent to the LSR WG mailing
> list.* The document will not advance to the next stage until a
> response has been received from each author and contributor.
> 
> If you are on the LSR WG email list but are not listed as an author or
> contributor, then please explicitly respond only if you are aware of
> any IPR that has not yet been disclosed in conformance with IETF rules.
> ===
> 
> --
> Uma C.


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Subject: Re: [Lsr] IPR Poll on draft-ietf-isis-segment-routing-extensions-16 (Shepherd write-up)
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I'm not aware of any IPR that has not been previously disclosed

> On 19.06.2018, at 19:07, Clarence Filsfils (cfilsfil) <cfilsfil=3D40cisco.=
com@dmarc.ietf.org> wrote:
>=20
> I'm not aware of any IPR that has not been previously disclosed
>=20
> Cheers,
> Clarence
>=20
>> On 11/06/2018 21:18, Uma Chunduri wrote:
>> Dear All,
>> Are you aware of any IPR that applies to
>> https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions-16=
 ?
>> Sending this email as suggested by LSR chairs - as this was not noticed d=
uring/around WGLC.
>> =3D=3D=3D
>> If so, has this IPR been disclosed in compliance with IETF IPR rules
>> (see RFCs 3979, 4879, 3669 and 5378 for more details).
>> If you are listed as a document author or contributor please respond
>> to this email regardless of whether or not you are aware of any
>> relevant IPR. *The response needs to be sent to the LSR WG mailing
>> list.* The document will not advance to the next stage until a
>> response has been received from each author and contributor.
>> If you are on the LSR WG email list but are not listed as an author or
>> contributor, then please explicitly respond only if you are aware of
>> any IPR that has not yet been disclosed in conformance with IETF rules.
>> =3D=3D=3D
>> --
>> Uma C.
>=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: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>, "draft-ietf-isis-segment-routing-extensions.all@ietf.org" <draft-ietf-isis-segment-routing-extensions.all@ietf.org>
CC: Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>, "spring@ietf.org" <spring@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>
Thread-Topic: A question about Mirror SID and its advertisement using IS-IS
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Date: Tue, 19 Jun 2018 19:59:43 +0000
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Subject: Re: [Lsr] A question about Mirror SID and its advertisement using IS-IS
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Sasha -

Thanx for pointing this out.

Up until V13 of the draft the SID/Label Binding TLV had multiple use cases =
and there was introductory text in Section 2.4 which described these use ca=
ses.
All use cases other than SRMS were removed in V13 (principally the ERO type=
s) as they were not in use and the introductory text was removed.

Support for Mirror SID was restored in V14 (thanx to Chris Bowers) but we n=
ever updated the introductory text in Section 2.4 to reflect this.

Attached are proposed diffs to address this gap. Hopefully this will resolv=
e the issue for you.

   Les


From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Sent: Tuesday, June 19, 2018 7:27 AM
To: draft-ietf-isis-segment-routing-extensions.all@ietf.org
Cc: Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>; spring@ietf.org;=
 lsr@ietf.org
Subject: A question about Mirror SID and its advertisement using IS-IS

Hi all,
I have a question about Mirror SID as defined in the SR Architecture<https:=
//tools.ietf.org/html/draft-ietf-spring-segment-routing-15> draft and its a=
dvertisement defined in the IS-IS extensions for SR<https://datatracker.iet=
f.org/doc/draft-ietf-isis-segment-routing-extensions/> draft.

Mirror SID is defined in Section 5.1 of the SR Architecture draft as follow=
ing:
5.1<https://tools.ietf.org/html/draft-ietf-spring-segment-routing-15#sectio=
n-5.1>.  IGP Mirroring Context Segment


   One use case for a Binding Segment is to provide support for an IGP
   node to advertise its ability to process traffic originally destined
   to another IGP node, called the Mirrored node and identified by an IP
   address or a Node-SID, provided that a "Mirroring Context" segment be
   inserted in the segment list prior to any service segment local to
   the mirrored node.

   When a given node B wants to provide egress node A protection, it

   advertises a segment identifying node's A context.  Such segment is

   called "Mirror Context Segment" and identified by the Mirror SID.



   The Mirror SID is advertised using the binding segment defined in SR

   IGP protocol extensions [I-D.ietf-isis-segment-routing-extensions<https:=
//tools.ietf.org/html/draft-ietf-spring-segment-routing-15#ref-I-D.ietf-isi=
s-segment-routing-extensions>] .



   In the event of a failure, a point of local repair (PLR) diverting

   traffic from A to B does a PUSH of the Mirror SID on the protected

   traffic.  B, when receiving the traffic with the Mirror SID as the

   active segment, uses that segment and processes underlying segments

   in the context of A.

Please note that these definitions do not mention SR Mapping Server or any =
such thing.

At the same time, the IS-IS Extensions for SR draft only mentions mirror co=
ntext in Section 2.4 that says:

2.4<https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions-=
17#section-2.4>.  SID/Label Binding TLV





   The SID/Label Binding TLV MAY be originated by any router in an IS-IS

   domain.



   The SID/Label Binding TLV is used to advertise prefixes to SID/Label

   mappings.  This functionality is called the Segment Routing Mapping

   Server (SRMS).  The behavior of the SRMS is defined in

   [I-D.ietf-spring-segment-routing-ldp-interop<https://tools.ietf.org/html=
/draft-ietf-isis-segment-routing-extensions-17#ref-I-D.ietf-spring-segment-=
routing-ldp-interop>].
...
2.4.1<https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extension=
s-17#section-2.4.1>.  Flags





   Flags: 1 octet field of following flags:



    0 1 2 3 4 5 6 7

   +-+-+-+-+-+-+-+-+

   |F|M|S|D|A|     |

   +-+-+-+-+-+-+-+-+



   where:



      F-Flag: Address Family flag.  If unset, then the Prefix carries an

      IPv4 Prefix.  If set then the Prefix carries an IPv6 Prefix.



      M-Flag: Mirror Context flag.  Set if the advertised SID

      corresponds to a mirrored context.  The use of the M flag is

      described in [I-D.ietf-spring-segment-routing<https://tools.ietf.org/=
html/draft-ietf-isis-segment-routing-extensions-17#ref-I-D.ietf-spring-segm=
ent-routing>].

...

This seems to imply that mirrored context is related to the SRMS - but, to =
the best of my understanding, these are completely unrelated.
Please note also that the SR Architecture draft says that the Mirroring Con=
text SID is a segment that identifies the node, and not any prefix. And, of=
 course the SR Architecture draft does not describe usage of any flags.

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<mailto:Alexander.Vainshtein@ecite=
le.com>


___________________________________________________________________________

This e-mail message is intended for the recipient only and contains informa=
tion which is
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have recei=
ved this
transmission in error, please inform us by e-mail, phone or fax, and then d=
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<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Sasha &#8211;<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">Thanx for pointing thi=
s out.<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">Up until V13 of the dr=
aft the SID/Label Binding TLV had multiple use cases and there was introduc=
tory text in Section 2.4 which described these use cases.<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">All use cases other th=
an SRMS were removed in V13 (principally the ERO types) as they were not in=
 use and the introductory text was removed.<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">Support for Mirror SID=
 was restored in V14 (thanx to Chris Bowers) but we never updated the intro=
ductory text in Section 2.4 to reflect this.<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">Attached are proposed =
diffs to address this gap. Hopefully this will resolve the issue for you.<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">&nbsp;&nbsp; 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"><o:p>&nbsp;</o:p></spa=
n></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> Alexander Vainshtein &lt;Alexander.Vain=
shtein@ecitele.com&gt;
<br>
<b>Sent:</b> Tuesday, June 19, 2018 7:27 AM<br>
<b>To:</b> draft-ietf-isis-segment-routing-extensions.all@ietf.org<br>
<b>Cc:</b> Michael Gorokhovsky &lt;Michael.Gorokhovsky@ecitele.com&gt;; spr=
ing@ietf.org; lsr@ietf.org<br>
<b>Subject:</b> A question about Mirror SID and its advertisement using IS-=
IS<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Hi all,<o:p></o:p></p>
<p class=3D"MsoNormal">I have a question about Mirror SID as defined in the=
 <a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-1=
5">
SR Architecture</a> draft and its advertisement defined in the <a href=3D"h=
ttps://datatracker.ietf.org/doc/draft-ietf-isis-segment-routing-extensions/=
">
IS-IS extensions for SR</a> draft.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Mirror SID is defined in Section 5.1 of the SR Archi=
tecture draft as following:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-a=
lt:auto;mso-line-height-alt:0pt">
<a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-15=
#section-5.1"><b><span style=3D"font-size:10.0pt;font-family:&quot;Courier =
New&quot;;color:black">5.1</span></b></a><a name=3D"section-5.1"></a><b><sp=
an style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;color:blac=
k">.&nbsp;
 IGP Mirroring Context Segment<o:p></o:p></span></b></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black"><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;;color:black"><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;;color:black">&nbsp;&nbsp; One use case for a Binding Segmen=
t is to provide support for an IGP<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; node to advertise its ability to =
process traffic originally destined<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; to another IGP node, called the M=
irrored node and identified by an IP<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; address or a Node-SID, provided t=
hat a &quot;Mirroring Context&quot; segment be<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; inserted in the segment list prio=
r to any service segment local to<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">&nbsp;&nbsp; the mirrored node.<o:p></o:p></sp=
an></p>
<pre><span style=3D"color:black">&nbsp;&nbsp; When a given node B wants to =
provide egress node A protection, it<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; advertises a segment identify=
ing node's A context.&nbsp; Such segment is<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; called &quot;Mirror Context S=
egment&quot; and identified by the Mirror SID.<o:p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; The Mirror SID is advertised =
using the binding segment defined in SR<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; IGP protocol extensions [<a h=
ref=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-15#ref=
-I-D.ietf-isis-segment-routing-extensions" title=3D"&quot;IS-IS Extensions =
for Segment Routing&quot;">I-D.ietf-isis-segment-routing-extensions</a>] .<=
o:p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; In the event of a failure, a =
point of local repair (PLR) diverting<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; traffic from A to B does a PU=
SH of the Mirror SID on the protected<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; traffic.&nbsp; B, when receiv=
ing the traffic with the Mirror SID as the<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; active segment, uses that seg=
ment and processes underlying segments<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; in the context of A.<o:p></o:=
p></span></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Please note that these definitions do not mention <s=
pan style=3D"background:yellow;mso-highlight:yellow">
SR Mapping Server</span> or any such thing.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">At the same time, the IS-IS Extensions for SR draft =
only mentions mirror context in Section 2.4 that says:<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<h3 style=3D"mso-line-height-alt:0pt"><a href=3D"https://tools.ietf.org/htm=
l/draft-ietf-isis-segment-routing-extensions-17#section-2.4"><span style=3D=
"font-size:10.0pt;font-family:&quot;Courier New&quot;;color:black">2.4</spa=
n></a><a name=3D"section-2.4"></a><span style=3D"font-size:10.0pt;font-fami=
ly:&quot;Courier New&quot;;color:black">.&nbsp;
 SID/Label Binding TLV<o:p></o:p></span></h3>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; The SID/Label Binding TLV MAY=
 be originated by any router in an IS-IS<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; domain.<o:p></o:p></span></pr=
e>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; <span style=3D"background:yel=
low;mso-highlight:yellow">The SID/Label Binding TLV is used to advertise pr=
efixes to SID/Label<o:p></o:p></span></span></pre>
<pre><span style=3D"color:black;background:yellow;mso-highlight:yellow">&nb=
sp;&nbsp; mappings.&nbsp; This functionality is called the Segment Routing =
Mapping<o:p></o:p></span></pre>
<pre><span style=3D"color:black;background:yellow;mso-highlight:yellow">&nb=
sp;&nbsp; Server (SRMS).</span><span style=3D"color:black">&nbsp; The behav=
ior of the SRMS is defined in<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; [<a href=3D"https://tools.iet=
f.org/html/draft-ietf-isis-segment-routing-extensions-17#ref-I-D.ietf-sprin=
g-segment-routing-ldp-interop" title=3D"&quot;Segment Routing interworking =
with LDP&quot;">I-D.ietf-spring-segment-routing-ldp-interop</a>].<o:p></o:p=
></span></pre>
<p class=3D"MsoNormal">...<o:p></o:p></p>
<h4 style=3D"mso-line-height-alt:0pt"><a href=3D"https://tools.ietf.org/htm=
l/draft-ietf-isis-segment-routing-extensions-17#section-2.4.1"><span style=
=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;color:black">2.4.1=
</span></a><a name=3D"section-2.4.1"></a><span style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;;color:black">.&nbsp;
 Flags<o:p></o:p></span></h4>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; Flags: 1 octet field of follo=
wing flags:<o:p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp; 0 1 2 3 4 5 6 7<o:p></o=
:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;=
-&#43;-&#43;-&#43;-&#43;<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; |F|M|S|D|A|&nbsp;&nbsp;&nbsp;=
&nbsp; |<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43;=
-&#43;-&#43;-&#43;-&#43;<o:p></o:p></span></pre>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; where:<o:p></o:p></span></pre=
>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; F-Flag: Add=
ress Family flag.&nbsp; If unset, then the Prefix carries an<o:p></o:p></sp=
an></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; IPv4 Prefix=
.&nbsp; If set then the Prefix carries an IPv6 Prefix.<o:p></o:p></span></p=
re>
<pre><span style=3D"color:black"><o:p>&nbsp;</o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; M-Flag: Mir=
ror Context flag.&nbsp; Set if the advertised SID<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; corresponds=
 to a mirrored context.&nbsp; The use of the M flag is<o:p></o:p></span></p=
re>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; described i=
n [<a href=3D"https://tools.ietf.org/html/draft-ietf-isis-segment-routing-e=
xtensions-17#ref-I-D.ietf-spring-segment-routing" title=3D"&quot;Segment Ro=
uting Architecture&quot;">I-D.ietf-spring-segment-routing</a>].<o:p></o:p><=
/span></pre>
<pre><span style=3D"color:black">...<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">This seems to imply that mirrored context is related=
 to the SRMS &#8211; but, to the best of my understanding, these are comple=
tely unrelated.
<o:p></o:p></p>
<p class=3D"MsoNormal">Please note also that the SR Architecture draft says=
 that the Mirroring Context SID is a segment that identifies the node, and =
not any prefix. And, of course the SR Architecture draft does not describe =
usage of any flags.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">What (if anything) did I miss?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p></=
p>
<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;972-5492663=
02<o:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; <a href=3D"mailto:Alexander.Vains=
htein@ecitele.com">Alexander.Vainshtein@ecitele.com</a><o:p></o:p></p>
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--_004_7aaaddfdb34049b2961cdb44b1c1eb86XCHALN001ciscocom_--


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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "Les Ginsberg (ginsberg)" <ginsberg@cisco.com>
CC: Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>, "spring@ietf.org" <spring@ietf.org>, "lsr@ietf.org" <lsr@ietf.org>, "draft-ietf-isis-segment-routing-extensions.all@ietf.org" <draft-ietf-isis-segment-routing-extensions.all@ietf.org>
Thread-Topic: A question about Mirror SID and its advertisement using IS-IS
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/a0eLwHk4INfUDVEqRrMlUxCBGtA>
Subject: Re: [Lsr] A question about Mirror SID and its advertisement using IS-IS
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Les,
Lots of thanks for a prompt response.
The proposed text looks fine to me.

Regards,
Sasha

Office: +972-39266302
Cell:      +972-549266302
Email:   Alexander.Vainshtein@ecitele.com

From: Les Ginsberg (ginsberg) [mailto:ginsberg@cisco.com]
Sent: Tuesday, June 19, 2018 11:00 PM
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>; draft-ietf-is=
is-segment-routing-extensions.all@ietf.org
Cc: Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>; spring@ietf.org=
; lsr@ietf.org
Subject: RE: A question about Mirror SID and its advertisement using IS-IS=


Sasha -

Thanx for pointing this out.

Up until V13 of the draft the SID/Label Binding TLV had multiple use cases=
 and there was introductory text in Section 2.4 which described these use =
cases.
All use cases other than SRMS were removed in V13 (principally the ERO typ=
es) as they were not in use and the introductory text was removed.

Support for Mirror SID was restored in V14 (thanx to Chris Bowers) but we =
never updated the introductory text in Section 2.4 to reflect this.

Attached are proposed diffs to address this gap. Hopefully this will resol=
ve the issue for you.

   Les


From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com<mailto:Alexan=
der.Vainshtein@ecitele.com>>
Sent: Tuesday, June 19, 2018 7:27 AM
To: draft-ietf-isis-segment-routing-extensions.all@ietf.org<mailto:draft-i=
etf-isis-segment-routing-extensions.all@ietf.org>
Cc: Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com<mailto:Michael.Go=
rokhovsky@ecitele.com>>; spring@ietf.org<mailto:spring@ietf.org>; lsr@ietf=
.org<mailto:lsr@ietf.org>
Subject: A question about Mirror SID and its advertisement using IS-IS

Hi all,
I have a question about Mirror SID as defined in the SR Architecture<https=
://tools.ietf.org/html/draft-ietf-spring-segment-routing-15> draft and its=
 advertisement defined in the IS-IS extensions for SR<https://datatracker.=
ietf.org/doc/draft-ietf-isis-segment-routing-extensions/> draft.

Mirror SID is defined in Section 5.1 of the SR Architecture draft as follo=
wing:
5.1<https://tools.ietf.org/html/draft-ietf-spring-segment-routing-15#secti=
on-5.1>.  IGP Mirroring Context Segment


   One use case for a Binding Segment is to provide support for an IGP
   node to advertise its ability to process traffic originally destined
   to another IGP node, called the Mirrored node and identified by an IP
   address or a Node-SID, provided that a "Mirroring Context" segment be
   inserted in the segment list prior to any service segment local to
   the mirrored node.

   When a given node B wants to provide egress node A protection, it

   advertises a segment identifying node's A context.  Such segment is

   called "Mirror Context Segment" and identified by the Mirror SID.



   The Mirror SID is advertised using the binding segment defined in SR

   IGP protocol extensions [I-D.ietf-isis-segment-routing-extensions<https=
://tools.ietf.org/html/draft-ietf-spring-segment-routing-15#ref-I-D.ietf-i=
sis-segment-routing-extensions>] .



   In the event of a failure, a point of local repair (PLR) diverting

   traffic from A to B does a PUSH of the Mirror SID on the protected

   traffic.  B, when receiving the traffic with the Mirror SID as the

   active segment, uses that segment and processes underlying segments

   in the context of A.

Please note that these definitions do not mention SR Mapping Server or any=
 such thing.

At the same time, the IS-IS Extensions for SR draft only mentions mirror c=
ontext in Section 2.4 that says:

2.4<https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions=
-17#section-2.4>.  SID/Label Binding TLV





   The SID/Label Binding TLV MAY be originated by any router in an IS-IS

   domain.



   The SID/Label Binding TLV is used to advertise prefixes to SID/Label

   mappings.  This functionality is called the Segment Routing Mapping

   Server (SRMS).  The behavior of the SRMS is defined in

   [I-D.ietf-spring-segment-routing-ldp-interop<https://tools.ietf.org/htm=
l/draft-ietf-isis-segment-routing-extensions-17#ref-I-D.ietf-spring-segmen=
t-routing-ldp-interop>].
...
2.4.1<https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensio=
ns-17#section-2.4.1>.  Flags





   Flags: 1 octet field of following flags:



    0 1 2 3 4 5 6 7

   +-+-+-+-+-+-+-+-+

   |F|M|S|D|A|     |

   +-+-+-+-+-+-+-+-+



   where:



      F-Flag: Address Family flag.  If unset, then the Prefix carries an

      IPv4 Prefix.  If set then the Prefix carries an IPv6 Prefix.



      M-Flag: Mirror Context flag.  Set if the advertised SID

      corresponds to a mirrored context.  The use of the M flag is

      described in [I-D.ietf-spring-segment-routing<https://tools.ietf.org=
/html/draft-ietf-isis-segment-routing-extensions-17#ref-I-D.ietf-spring-se=
gment-routing>].

...

This seems to imply that mirrored context is related to the SRMS - but, to=
 the best of my understanding, these are completely unrelated.
Please note also that the SR Architecture draft says that the Mirroring Co=
ntext SID is a segment that identifies the node, and not any prefix. And, =
of course the SR Architecture draft does not describe usage of any flags.

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<mailto:Alexander.Vainshtein@ecit=
ele.com>


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<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">Lots of thanks for a =
prompt response.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">The proposed text loo=
ks fine to me.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Regards,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Sasha<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Office: &#43;972-3926=
6302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Cell:&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Email:&nbsp;&nbsp; Al=
exander.Vainshtein@ecitele.com<o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Les Ginsberg (ginsberg) [mailto:ginsbe=
rg@cisco.com]
<br>
<b>Sent:</b> Tuesday, June 19, 2018 11:00 PM<br>
<b>To:</b> Alexander Vainshtein &lt;Alexander.Vainshtein@ecitele.com&gt;; =
draft-ietf-isis-segment-routing-extensions.all@ietf.org<br>
<b>Cc:</b> Michael Gorokhovsky &lt;Michael.Gorokhovsky@ecitele.com&gt;; sp=
ring@ietf.org; lsr@ietf.org<br>
<b>Subject:</b> RE: A question about Mirror SID and its advertisement usin=
g IS-IS<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">Sasha &#8211;</span><=
o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Thanx for pointing th=
is out.</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Up until V13 of the d=
raft the SID/Label Binding TLV had multiple use cases and there was introd=
uctory text in Section 2.4 which described these use cases.</span><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">All use cases other t=
han SRMS were removed in V13 (principally the ERO types) as they were not =
in use and the introductory text was removed.</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Support for Mirror SI=
D was restored in V14 (thanx to Chris Bowers) but we never updated the int=
roductory text in Section 2.4 to reflect this.</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Attached are proposed=
 diffs to address this gap. Hopefully this will resolve the issue for you.=
</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;&nbsp; Les</spa=
n><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span><o:p></o=
:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span><o:p></o=
:p></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"><b>From:</b> Alexander Vainshtein &lt;<a href=3D"ma=
ilto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a=
>&gt;
<br>
<b>Sent:</b> Tuesday, June 19, 2018 7:27 AM<br>
<b>To:</b> <a href=3D"mailto:draft-ietf-isis-segment-routing-extensions.al=
l@ietf.org">
draft-ietf-isis-segment-routing-extensions.all@ietf.org</a><br>
<b>Cc:</b> Michael Gorokhovsky &lt;<a href=3D"mailto:Michael.Gorokhovsky@e=
citele.com">Michael.Gorokhovsky@ecitele.com</a>&gt;;
<a href=3D"mailto:spring@ietf.org">spring@ietf.org</a>; <a href=3D"mailto:=
lsr@ietf.org">
lsr@ietf.org</a><br>
<b>Subject:</b> A question about Mirror SID and its advertisement using IS=
-IS<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Hi all,<o:p></o:p></p>
<p class=3D"MsoNormal">I have a question about Mirror SID as defined in th=
e <a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing=
-15">
SR Architecture</a> draft and its advertisement defined in the <a href=3D"=
https://datatracker.ietf.org/doc/draft-ietf-isis-segment-routing-extension=
s/">
IS-IS extensions for SR</a> draft.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Mirror SID is defined in Section 5.1 of the SR Arch=
itecture draft as following:<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"mso-margin-top-alt:auto;mso-margin-bottom-=
alt:auto;mso-line-height-alt:0pt">
<a href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-1=
5#section-5.1"><b><span style=3D"font-size:10.0pt;font-family:&quot;Courie=
r New&quot;;color:black">5.1</span></b></a><a name=3D"section-5.1"></a><b>=
<span style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;color:=
black">.&nbsp;
 IGP Mirroring Context Segment</span></b><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp; One use case for a Binding Segm=
ent is to provide support for an IGP</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp; node to advertise its ability t=
o process traffic originally destined</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp; to another IGP node, called the=
 Mirrored node and identified by an IP</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp; address or a Node-SID, provided=
 that a &quot;Mirroring Context&quot; segment be</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp; inserted in the segment list pr=
ior to any service segment local to</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;C=
ourier New&quot;;color:black">&nbsp;&nbsp; the mirrored node.</span><o:p><=
/o:p></p>
<pre><span style=3D"color:black">&nbsp;&nbsp; When a given node B wants to=
 provide egress node A protection, it</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; advertises a segment identif=
ying node's A context.&nbsp; Such segment is</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; called &quot;Mirror Context =
Segment&quot; and identified by the Mirror SID.</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; The Mirror SID is advertised=
 using the binding segment defined in SR</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; IGP protocol extensions [<a =
href=3D"https://tools.ietf.org/html/draft-ietf-spring-segment-routing-15#r=
ef-I-D.ietf-isis-segment-routing-extensions" title=3D"&quot;IS-IS Extensio=
ns for Segment Routing&quot;">I-D.ietf-isis-segment-routing-extensions</a>=
] .</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; In the event of a failure, a=
 point of local repair (PLR) diverting</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; traffic from A to B does a P=
USH of the Mirror SID on the protected</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; traffic.&nbsp; B, when recei=
ving the traffic with the Mirror SID as the</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; active segment, uses that se=
gment and processes underlying segments</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; in the context of A.</span><=
o:p></o:p></pre>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Please note that these definitions do not mention <=
span style=3D"background:yellow;mso-highlight:yellow">
SR Mapping Server</span> or any such thing.<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">At the same time, the IS-IS Extensions for SR draft=
 only mentions mirror context in Section 2.4 that says:<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<h3 style=3D"mso-line-height-alt:0pt"><a href=3D"https://tools.ietf.org/ht=
ml/draft-ietf-isis-segment-routing-extensions-17#section-2.4"><span style=3D=
"font-size:10.0pt;font-family:&quot;Courier New&quot;;color:black">2.4</sp=
an></a><a name=3D"section-2.4"></a><span style=3D"font-size:10.0pt;font-fa=
mily:&quot;Courier New&quot;;color:black">.&nbsp;
 SID/Label Binding TLV</span><o:p></o:p></h3>
<pre><span style=3D"color:black">&nbsp;</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; The SID/Label Binding TLV MA=
Y be originated by any router in an IS-IS</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; domain.</span><o:p></o:p></p=
re>
<pre><span style=3D"color:black">&nbsp;</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; <span style=3D"background:ye=
llow;mso-highlight:yellow">The SID/Label Binding TLV is used to advertise =
prefixes to SID/Label</span></span><o:p></o:p></pre>
<pre><span style=3D"color:black;background:yellow;mso-highlight:yellow">&n=
bsp;&nbsp; mappings.&nbsp; This functionality is called the Segment Routin=
g Mapping</span><o:p></o:p></pre>
<pre><span style=3D"color:black;background:yellow;mso-highlight:yellow">&n=
bsp;&nbsp; Server (SRMS).</span><span style=3D"color:black">&nbsp; The beh=
avior of the SRMS is defined in</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; [<a href=3D"https://tools.ie=
tf.org/html/draft-ietf-isis-segment-routing-extensions-17#ref-I-D.ietf-spr=
ing-segment-routing-ldp-interop" title=3D"&quot;Segment Routing interworki=
ng with LDP&quot;">I-D.ietf-spring-segment-routing-ldp-interop</a>].</span=
><o:p></o:p></pre>
<p class=3D"MsoNormal">...<o:p></o:p></p>
<h4 style=3D"mso-line-height-alt:0pt"><a href=3D"https://tools.ietf.org/ht=
ml/draft-ietf-isis-segment-routing-extensions-17#section-2.4.1"><span styl=
e=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;color:black">2.4=
.1</span></a><a name=3D"section-2.4.1"></a><span style=3D"font-size:10.0pt=
;font-family:&quot;Courier New&quot;;color:black">.&nbsp;
 Flags</span><o:p></o:p></h4>
<pre><span style=3D"color:black">&nbsp;</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; Flags: 1 octet field of foll=
owing flags:</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp; 0 1 2 3 4 5 6 7</span>=
<o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43=
;-&#43;-&#43;-&#43;-&#43;</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; |F|M|S|D|A|&nbsp;&nbsp;&nbsp=
;&nbsp; |</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; &#43;-&#43;-&#43;-&#43;-&#43=
;-&#43;-&#43;-&#43;-&#43;</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; where:</span><o:p></o:p></pr=
e>
<pre><span style=3D"color:black">&nbsp;</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; F-Flag: Ad=
dress Family flag.&nbsp; If unset, then the Prefix carries an</span><o:p><=
/o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; IPv4 Prefi=
x.&nbsp; If set then the Prefix carries an IPv6 Prefix.</span><o:p></o:p><=
/pre>
<pre><span style=3D"color:black">&nbsp;</span><o:p></o:p></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; M-Flag: Mi=
rror=20Context flag.&nbsp; Set if the advertised SID</span><o:p></o:p></pr=
e>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; correspond=
s to a mirrored context.&nbsp; The use of the M flag is</span><o:p></o:p><=
/pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; described =
in [<a href=3D"https://tools.ietf.org/html/draft-ietf-isis-segment-routing=
-extensions-17#ref-I-D.ietf-spring-segment-routing" title=3D"&quot;Segment=
 Routing Architecture&quot;">I-D.ietf-spring-segment-routing</a>].</span><=
o:p></o:p></pre>
<pre><span style=3D"color:black">...</span><o:p></o:p></pre>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">This seems to imply that mirrored context is relate=
d to the SRMS &#8211; but, to the best of my understanding, these are comp=
letely unrelated.
<o:p></o:p></p>
<p class=3D"MsoNormal">Please note also that the SR Architecture draft say=
s that the Mirroring Context SID is a segment that identifies the node, an=
d not any prefix. And, of course the SR Architecture draft does not descri=
be usage of any flags.
<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">What (if anything) did I miss?<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p><=
/p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></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; <a href=3D"mailto:Alexander.Vain=
shtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a><o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;T=
imes New Roman&quot;,serif"><br>
__________________________________________________________________________=
_<br>
<br>
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ation which is
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CONFIDENTIAL and which may be proprietary=20to ECI Telecom. If you have re=
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transmission in error, please inform us by e-mail, phone or fax, and then =
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__________________________________________________________________________=
_<BR>
<BR>
This e-mail message is intended for the recipient only and contains inform=
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From nobody Wed Jun 20 07:14:12 2018
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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 Extensions for Segment Routing
        Authors         : Stefano Previdi
                          Les Ginsberg
                          Clarence Filsfils
                          Ahmed Bashandy
                          Hannes Gredler
                          Stephane Litkowski
                          Bruno Decraene
                          Jeff Tantsura
	Filename        : draft-ietf-isis-segment-routing-extensions-18.txt
	Pages           : 35
	Date            : 2018-06-20

Abstract:
   Segment Routing (SR) allows for a flexible definition of end-to-end
   paths within IGP topologies by encoding paths as sequences of
   topological sub-paths, called "segments".  These segments are
   advertised by the link-state routing protocols (IS-IS and OSPF).

   This draft describes the necessary IS-IS extensions that need to be
   introduced for Segment Routing operating on an MPLS data-plane.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-isis-segment-routing-extensions/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions-18
https://datatracker.ietf.org/doc/html/draft-ietf-isis-segment-routing-extensions-18

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-isis-segment-routing-extensions-18


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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To: lsr@ietf.org
References: <CAF18ct5OPY+YMLab5fOLpun=3+4G_KTXNyaMk7BkGsyhA7YHHQ@mail.gmail.com>
From: Martin Horneffer <maho@nic.dtag.de>
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Date: Mon, 25 Jun 2018 10:15:40 +0200
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Subject: Re: [Lsr] IPR Poll on draft-ietf-isis-segment-routing-extensions-16 (Shepherd write-up)
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I am not aware of any IPR related to this document.

Best regards, Martin


Am 11.06.18 um 21:18 schrieb Uma Chunduri:
> Dear All,
>
> Are you aware of any IPR that applies to
> https://tools.ietf.org/html/draft-ietf-isis-segment-routing-extensions-16 
> ?
>
> Sending this email as suggested by LSR chairs - as this was not 
> noticed during/around WGLC.
>
> ===
> If so, has this IPR been disclosed in compliance with IETF IPR rules
> (see RFCs 3979, 4879, 3669 and 5378 for more details).
>
> If you are listed as a document author or contributor please respond
> to this email regardless of whether or not you are aware of any
> relevant IPR. *The response needs to be sent to the LSR WG mailing
> list.* The document will not advance to the next stage until a
> response has been received from each author and contributor.
>
> If you are on the LSR WG email list but are not listed as an author or
> contributor, then please explicitly respond only if you are aware of
> any IPR that has not yet been disclosed in conformance with IETF rules.
> ===
>
> --
> Uma C.


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Subject: [Lsr] Fwd: New Version Notification for draft-li-dynamic-flooding-05.txt
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FYI=E2=80=A6

Significant changes since -04:

- Added Peter Psenak as co-author.
- Added OSPF LSA encodings.
- Added an option for a distributed topology computation. No algorithm =
specified at this time.

As always, comments are welcomed.

Regards,
Peter & Tony


> Begin forwarded message:
>=20
> From: internet-drafts@ietf.org
> Subject: New Version Notification for draft-li-dynamic-flooding-05.txt
> Date: June 28, 2018 at 8:42:07 AM PDT
> To: "Peter Psenak" <ppsenak@cisco.com>, "Tony Li" <tony.li@tony.li>
>=20
>=20
> A new version of I-D, draft-li-dynamic-flooding-05.txt
> has been successfully submitted by Peter Psenak and posted to the
> IETF repository.
>=20
> Name:		draft-li-dynamic-flooding
> Revision:	05
> Title:		Dynamic Flooding on Dense Graphs
> Document date:	2018-06-28
> Group:		Individual Submission
> Pages:		28
> URL:            =
https://www.ietf.org/internet-drafts/draft-li-dynamic-flooding-05.txt
> Status:         =
https://datatracker.ietf.org/doc/draft-li-dynamic-flooding/
> Htmlized:       =
https://tools.ietf.org/html/draft-li-dynamic-flooding-05
> Htmlized:       =
https://datatracker.ietf.org/doc/html/draft-li-dynamic-flooding
> Diff:           =
https://www.ietf.org/rfcdiff?url2=3Ddraft-li-dynamic-flooding-05
>=20
> Abstract:
>   Routing with link state protocols in dense network topologies can
>   result in sub-optimal convergence times due to the overhead
>   associated with flooding.  This can be addressed by decreasing the
>   flooding topology so that it is less dense.
>=20
>   This document discusses the problem in some depth and an
>   architectural solution.  Specific protocol changes for IS-IS, =
OSPFv2,
>   and OSPFv3 are described in this document.
>=20
>=20
>=20
>=20
> 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.
>=20
> The IETF Secretariat
>=20


--Apple-Mail=_4424220F-BA54-465B-83C5-A6296D8389C5
Content-Transfer-Encoding: quoted-printable
Content-Type: text/html;
	charset=utf-8

<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>FYI=E2=80=A6<div class=3D""><br =
class=3D""></div><div class=3D"">Significant changes since =
-04:</div><div class=3D""><br class=3D""></div><div class=3D"">- Added =
Peter Psenak as co-author.</div><div class=3D"">- Added OSPF LSA =
encodings.</div><div class=3D"">- Added an option for a distributed =
topology computation. No algorithm specified at this time.</div><div =
class=3D""><br class=3D""><div>As always, comments are =
welcomed.</div><div><br class=3D""></div><div>Regards,</div><div>Peter =
&amp; Tony</div><div><br class=3D""></div><div><br class=3D""><blockquote =
type=3D"cite" class=3D""><div class=3D"">Begin forwarded =
message:</div><br class=3D"Apple-interchange-newline"><div =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px;" class=3D""><span style=3D"font-family: =
-webkit-system-font, Helvetica Neue, Helvetica, sans-serif; =
color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">From: =
</b></span><span style=3D"font-family: -webkit-system-font, Helvetica =
Neue, Helvetica, sans-serif;" class=3D""><a =
href=3D"mailto:internet-drafts@ietf.org" =
class=3D"">internet-drafts@ietf.org</a><br class=3D""></span></div><div =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px;" class=3D""><span style=3D"font-family: =
-webkit-system-font, Helvetica Neue, Helvetica, sans-serif; =
color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">Subject: =
</b></span><span style=3D"font-family: -webkit-system-font, Helvetica =
Neue, Helvetica, sans-serif;" class=3D""><b class=3D"">New Version =
Notification for draft-li-dynamic-flooding-05.txt</b><br =
class=3D""></span></div><div style=3D"margin-top: 0px; margin-right: =
0px; margin-bottom: 0px; margin-left: 0px;" class=3D""><span =
style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica, =
sans-serif; color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">Date: =
</b></span><span style=3D"font-family: -webkit-system-font, Helvetica =
Neue, Helvetica, sans-serif;" class=3D"">June 28, 2018 at 8:42:07 AM =
PDT<br class=3D""></span></div><div style=3D"margin-top: 0px; =
margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=3D""><span=
 style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica, =
sans-serif; color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">To: =
</b></span><span style=3D"font-family: -webkit-system-font, Helvetica =
Neue, Helvetica, sans-serif;" class=3D"">"Peter Psenak" &lt;<a =
href=3D"mailto:ppsenak@cisco.com" class=3D"">ppsenak@cisco.com</a>&gt;, =
"Tony Li" &lt;<a href=3D"mailto:tony.li@tony.li" =
class=3D"">tony.li@tony.li</a>&gt;<br class=3D""></span></div><br =
class=3D""><div class=3D""><div class=3D""><br class=3D"">A new version =
of I-D, draft-li-dynamic-flooding-05.txt<br class=3D"">has been =
successfully submitted by Peter Psenak and posted to the<br =
class=3D"">IETF repository.<br class=3D""><br class=3D"">Name:<span =
class=3D"Apple-tab-span" style=3D"white-space:pre">	</span><span =
class=3D"Apple-tab-span" style=3D"white-space:pre">	=
</span>draft-li-dynamic-flooding<br class=3D"">Revision:<span =
class=3D"Apple-tab-span" style=3D"white-space:pre">	</span>05<br =
class=3D"">Title:<span class=3D"Apple-tab-span" style=3D"white-space:pre">=
	</span><span class=3D"Apple-tab-span" style=3D"white-space:pre">	=
</span>Dynamic Flooding on Dense Graphs<br class=3D"">Document =
date:<span class=3D"Apple-tab-span" style=3D"white-space:pre">	=
</span>2018-06-28<br class=3D"">Group:<span class=3D"Apple-tab-span" =
style=3D"white-space:pre">	</span><span class=3D"Apple-tab-span" =
style=3D"white-space:pre">	</span>Individual Submission<br =
class=3D"">Pages:<span class=3D"Apple-tab-span" style=3D"white-space:pre">=
	</span><span class=3D"Apple-tab-span" style=3D"white-space:pre">	=
</span>28<br class=3D"">URL: =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a =
href=3D"https://www.ietf.org/internet-drafts/draft-li-dynamic-flooding-05.=
txt" =
class=3D"">https://www.ietf.org/internet-drafts/draft-li-dynamic-flooding-=
05.txt</a><br class=3D"">Status: =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a =
href=3D"https://datatracker.ietf.org/doc/draft-li-dynamic-flooding/" =
class=3D"">https://datatracker.ietf.org/doc/draft-li-dynamic-flooding/</a>=
<br class=3D"">Htmlized: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a =
href=3D"https://tools.ietf.org/html/draft-li-dynamic-flooding-05" =
class=3D"">https://tools.ietf.org/html/draft-li-dynamic-flooding-05</a><br=
 class=3D"">Htmlized: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a =
href=3D"https://datatracker.ietf.org/doc/html/draft-li-dynamic-flooding" =
class=3D"">https://datatracker.ietf.org/doc/html/draft-li-dynamic-flooding=
</a><br class=3D"">Diff: =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a =
href=3D"https://www.ietf.org/rfcdiff?url2=3Ddraft-li-dynamic-flooding-05" =
class=3D"">https://www.ietf.org/rfcdiff?url2=3Ddraft-li-dynamic-flooding-0=
5</a><br class=3D""><br class=3D"">Abstract:<br class=3D""> =
&nbsp;&nbsp;Routing with link state protocols in dense network =
topologies can<br class=3D""> &nbsp;&nbsp;result in sub-optimal =
convergence times due to the overhead<br class=3D""> =
&nbsp;&nbsp;associated with flooding. &nbsp;This can be addressed by =
decreasing the<br class=3D""> &nbsp;&nbsp;flooding topology so that it =
is less dense.<br class=3D""><br class=3D""> &nbsp;&nbsp;This document =
discusses the problem in some depth and an<br class=3D""> =
&nbsp;&nbsp;architectural solution. &nbsp;Specific protocol changes for =
IS-IS, OSPFv2,<br class=3D""> &nbsp;&nbsp;and OSPFv3 are described in =
this document.<br class=3D""><br class=3D""><br class=3D""><br =
class=3D""><br class=3D"">Please note that it may take a couple of =
minutes from the time of submission<br class=3D"">until the htmlized =
version and diff are available at <a href=3D"http://tools.ietf.org" =
class=3D"">tools.ietf.org</a>.<br class=3D""><br class=3D"">The IETF =
Secretariat<br class=3D""><br =
class=3D""></div></div></blockquote></div><br =
class=3D""></div></body></html>=

--Apple-Mail=_4424220F-BA54-465B-83C5-A6296D8389C5--


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Subject: [Lsr] Early review of draft-ietf-ospf-lls-interface-id
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To:

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Cc:

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Subject:

RtgDir Early review: draft-ietf-ospf-lls-interface-id-03.txt

Hello

I have been selected to do a routing directorate “early” review of this 
draft.
https://datatracker.ietf.org/doc/draft-ietf-ospf-lls-interface-id/

The routing directorate will, on request from the working group chair, 
perform an “early” review of a draft before it is submitted for 
publication to the IESG. The early review can be performed at any time 
during the draft’s lifetime as a working group document. The purpose of 
the early review depends on the stage that the document has reached.

As this document is close to working group last call, my focus for the 
review was to determine whether the document is ready to be published. 
Please consider my comments along with the other working group last call 
comments.

For more information about the Routing Directorate, please see 
​http://trac.tools.ietf.org/area/rtg/trac/wiki/RtgDir

Document: draft-ietf-ospf-lls-interface-id-03.txt
Reviewer: Loa Andersson
Review Date: 2018-06-29
Intended Status: Standards track

Summary:

No issues found.

This document is basically ready for publication, but has nits that 
should be considered prior to being submitted to the IESG.

I have gathered the nits in a word file that has been sent to the
authors and chairs. I also recommend that the authors take a look at
my proposed change to the IANA section.

Nits:

The nits found is that the Abstract is too raw, but as sufficient info
are available in the Introduction, this should be a simple editorial
change.

There is one sentence at the end of section that I think is ambigious.
But I leave it to the authors to update if they think it is necessary.

LSA is actually not a well-know abbreviation, and should be expanded.
However, I think it should be well-know, since this is within the
purview of the LSR chairs, I leave to them to take necessary actions
if they see fit.

I have suggested some editorial changes to the IANA considerations.

/Loa
-- 


Loa Andersson                        email: loa@pi.nu
Senior MPLS Expert
Bronze Dragon Consulting             phone: +46 739 81 21 64


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Archived-At: <https://mailarchive.ietf.org/arch/msg/lsr/KTlNImaVEz2M29DV3gRkjd5_qnE>
Subject: Re: [Lsr] [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)
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Stephane, Gunter, Ketan, Les, and Jeff:

Are you going to settle on option 2?  Will we be seeing drafts with this
change in this revision? 

Sue Hares 


-----Original Message-----
From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of
stephane.litkowski@orange.com
Sent: Wednesday, June 13, 2018 6:05 PM
To: Van De Velde, Gunter (Nokia - BE/Antwerp); Ketan Talaulikar (ketant);
idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: Re: [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)

Hi,

As defined in draft-ietf-mpls-spring-entropy-label, advertising an ERLD
means that the node is defacto ELC (so advertising ELC separately is not
necessary):

" The Entropy Readable Label Depth (ERLD) is defined as the number of
   labels a router can both:

   a.  Read in an MPLS packet received on its incoming interface(s)
       (starting from the top of the stack).

   b.  Use in its load-balancing function.

   The ERLD means that the router will perform load-balancing using the
   EL label if the EL is placed within the ERLD first labels.
"

"
To advertise an ERLD value, a SPRING router:

   o  MUST be entropy label capable and, as a consequence, MUST apply
      the dataplane procedures defined in [RFC6790].

   o  MUST be able to read an ELI/EL which is located within its ERLD
      value.

   o  MUST take into account this EL in its load-balancing function.
"


Brgds,


-----Original Message-----
From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Van De Velde, Gunter
(Nokia - BE/Antwerp)
Sent: Wednesday, June 13, 2018 11:10
To: Ketan Talaulikar (ketant); idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: Re: [Lsr] Signalling ERLD (ISIS, OSPF and BGP-LS)

It is desirable that same understanding of TLVs ([ELC, RLD] or [ERLD]) are
signaled for ISIS, OSPF and BGP-LS. 

If the WG's can manage to agree upon a decision (option1/2/3 or 4), then
next, have a look into how to encode the TLV so that we have a clean
technological solution space.

G/

-----Original Message-----
From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]
Sent: Wednesday, June 13, 2018 10:45
To: Van De Velde, Gunter (Nokia - BE/Antwerp)
<gunter.van_de_velde@nokia.com>; idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Hi Gunter,

In that case, I concur with you that option (2) is better than the others.
My only difference in opinion is that ERLD not have its own separate TLV but
instead get advertised as a new MSD sub-type - it is just a different
encoding.

Thanks,
Ketan

-----Original Message-----
From: Van De Velde, Gunter (Nokia - BE/Antwerp)
<gunter.van_de_velde@nokia.com>
Sent: 13 June 2018 13:55
To: Ketan Talaulikar (ketant) <ketant@cisco.com>; idr@ietf.org;
lsr@ietf.org; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Indeed, the debate that made BGP-LS to go down the ERLD path is of pragmatic
motivation.

The major Readable Label Depth use-case is entropy. Hence, if the ERLD TLV
is available, then ELC can be implicitly assumed. No pragmatic reason to
signal separately, as it just make things more complex then should be. 

>From a holistic perspective having something similar, yet different, in
both IGP and BGP-LS encoding seems to make little sense and only bring
confusion (router/controller implementers and network operators). 

The ways to address this in IGP and BGP-LS going forward:
1) do nothing and leave all as it is (it has potential to create massive
confusion)
2) only signal ERLD TLV in IGP and BGP
3) signal ELC TLV and RLD TLV (unclear pragmatic value of explicit signaling
of ELC TLV compared to option (2))
4) signal ELC TLV, RLD TLV and ERLD TLV (it has all, but is much much more
complex as option (2))

I believe that option (2) is the best option:
* it bring the needed readable label depth value to operators
* most simple solution for implementers (routers and controller)
* easy to understand with no confusion
* is compliant with draft-ietf-mpls-spring-entropy-label-10

G/

-----Original Message-----
From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]
Sent: Wednesday, June 13, 2018 08:05
To: Van De Velde, Gunter (Nokia - BE/Antwerp)
<gunter.van_de_velde@nokia.com>; idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Hi Gunter,

The difference in IGP signalling seems to be because the ELC is a capability
which is advertised differently than ERLD which is a limit. Are you saying
that ELC does not have value by itself without the ERLD?

IMHO it makes sense to retain ELC as capability of the router (as specified
in the IGP specs) and position ERLD as a MSD sub-type for indicating the
limit. This way we have the flexibility of signalling ERLD both per node and
per ingress link/LC level.

Thanks,
Ketan

-----Original Message-----
From: Idr <idr-bounces@ietf.org> On Behalf Of Van De Velde, Gunter (Nokia -
BE/Antwerp)
Sent: 12 June 2018 19:28
To: idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)

In LSR WG the following drafts document the signaling of ELC and RLD:
* draft-ietf-ospf-mpls-elc
* draft-ietf-isis-mpls-elc

When exporting this information using BGP-LS encoding to a controller, there
is need for BGP-LS extension by means of new TLVs.

BGP-LS is signaling ERLD (entropy capable readable label depth) ISIS/OSPF is
signaling individually ELC and RLD

I was working upon the IANA section, and discovered some inconsistency that
should be addressed:
* Why is IGP signaling individual ELC and RLD? ERLD is what was decided upon
(https://tools.ietf.org/html/draft-ietf-mpls-spring-entropy-label-10)
* What are the plans to request IANA code points for these drafts?
* (E)RLD seems to have meaning only from NODE perspective, (I assume that
LINK ERLD is not of any value at all, is that a correct assumption?)

G/


-----Original Message-----
From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of
internet-drafts@ietf.org
Sent: Tuesday, June 12, 2018 15:25
To: i-d-announce@ietf.org
Cc: idr@ietf.org
Subject: [Idr] I-D Action: draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt


A New Internet-Draft is available from the on-line Internet-Drafts
directories.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : Signalling ERLD using BGP-LS
        Authors         : Gunter Van de Velde
                          Wim Henderickx
                          Matthew Bocci
                          Keyur Patel
	Filename        : draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt
	Pages           : 6
	Date            : 2018-06-12

Abstract:
   This document defines the attribute encoding to use for BGP-LS to
   expose ERLD "Entropy capable Readable Label Depth" from a node to a
   centralised controller (PCE/SDN).



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-rld/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-rld-02
https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-ls-segment-routing-
rld-02

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-idr-bgp-ls-segment-routing-rld-
02


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/

_______________________________________________
Idr mailing list
Idr@ietf.org
https://www.ietf.org/mailman/listinfo/idr

_______________________________________________
Idr mailing list
Idr@ietf.org
https://www.ietf.org/mailman/listinfo/idr

_______________________________________________
Lsr mailing list
Lsr@ietf.org
https://www.ietf.org/mailman/listinfo/lsr

____________________________________________________________________________
_____________________________________________

Ce message et ses pieces jointes peuvent contenir des informations
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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
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used or copied without authorisation.
If you have received this email in error, please notify the sender and
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_______________________________________________
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Date: Fri, 29 Jun 2018 19:48:29 +0000 (UTC)
From: guntervandeveldecc@icloud.com
To: stephane.litkowski@orange.com, "'Van De Velde, Gunter (Nokia - BE/Antwerp)'" <gunter.van_de_velde@nokia.com>,  "'Ketan Talaulikar (ketant)'" <ketant@cisco.com>, idr@ietf.org, lsr@ietf.org,  spring@ietf.org, Susan Hares <shares@ndzh.com>
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Subject: Re: [Lsr] [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)
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Hope all is well with all.




I'll be happy to discuss in Montreal. Between now and then i am on vscation, so no new text from my side. Lsts better discuss first at IETF102.




G/




Gunter Van de Velde







On Fri, Jun 29, 2018 at 8:58 PM +0200, "Susan Hares" <shares@ndzh.com> wrote:










Stephane, Gunter, Ketan, Les, and Jeff:

Are you going to settle on option 2?  Will we be seeing drafts with this
change in this revision? 

Sue Hares 


-----Original Message-----
From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of
stephane.litkowski@orange.com
Sent: Wednesday, June 13, 2018 6:05 PM
To: Van De Velde, Gunter (Nokia - BE/Antwerp); Ketan Talaulikar (ketant);
idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: Re: [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)

Hi,

As defined in draft-ietf-mpls-spring-entropy-label, advertising an ERLD
means that the node is defacto ELC (so advertising ELC separately is not
necessary):

" The Entropy Readable Label Depth (ERLD) is defined as the number of
   labels a router can both:

   a.  Read in an MPLS packet received on its incoming interface(s)
       (starting from the top of the stack).

   b.  Use in its load-balancing function.

   The ERLD means that the router will perform load-balancing using the
   EL label if the EL is placed within the ERLD first labels.
"

"
To advertise an ERLD value, a SPRING router:

   o  MUST be entropy label capable and, as a consequence, MUST apply
      the dataplane procedures defined in [RFC6790].

   o  MUST be able to read an ELI/EL which is located within its ERLD
      value.

   o  MUST take into account this EL in its load-balancing function.
"


Brgds,


-----Original Message-----
From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Van De Velde, Gunter
(Nokia - BE/Antwerp)
Sent: Wednesday, June 13, 2018 11:10
To: Ketan Talaulikar (ketant); idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: Re: [Lsr] Signalling ERLD (ISIS, OSPF and BGP-LS)

It is desirable that same understanding of TLVs ([ELC, RLD] or [ERLD]) are
signaled for ISIS, OSPF and BGP-LS. 

If the WG's can manage to agree upon a decision (option1/2/3 or 4), then
next, have a look into how to encode the TLV so that we have a clean
technological solution space.

G/

-----Original Message-----
From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]
Sent: Wednesday, June 13, 2018 10:45
To: Van De Velde, Gunter (Nokia - BE/Antwerp)
; idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Hi Gunter,

In that case, I concur with you that option (2) is better than the others.
My only difference in opinion is that ERLD not have its own separate TLV but
instead get advertised as a new MSD sub-type - it is just a different
encoding.

Thanks,
Ketan

-----Original Message-----
From: Van De Velde, Gunter (Nokia - BE/Antwerp)

Sent: 13 June 2018 13:55
To: Ketan Talaulikar (ketant) ; idr@ietf.org;
lsr@ietf.org; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Indeed, the debate that made BGP-LS to go down the ERLD path is of pragmatic
motivation.

The major Readable Label Depth use-case is entropy. Hence, if the ERLD TLV
is available, then ELC can be implicitly assumed. No pragmatic reason to
signal separately, as it just make things more complex then should be. 

>From a holistic perspective having something similar, yet different, in
both IGP and BGP-LS encoding seems to make little sense and only bring
confusion (router/controller implementers and network operators). 

The ways to address this in IGP and BGP-LS going forward:
1) do nothing and leave all as it is (it has potential to create massive
confusion)
2) only signal ERLD TLV in IGP and BGP
3) signal ELC TLV and RLD TLV (unclear pragmatic value of explicit signaling
of ELC TLV compared to option (2))
4) signal ELC TLV, RLD TLV and ERLD TLV (it has all, but is much much more
complex as option (2))

I believe that option (2) is the best option:
* it bring the needed readable label depth value to operators
* most simple solution for implementers (routers and controller)
* easy to understand with no confusion
* is compliant with draft-ietf-mpls-spring-entropy-label-10

G/

-----Original Message-----
From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]
Sent: Wednesday, June 13, 2018 08:05
To: Van De Velde, Gunter (Nokia - BE/Antwerp)
; idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Hi Gunter,

The difference in IGP signalling seems to be because the ELC is a capability
which is advertised differently than ERLD which is a limit. Are you saying
that ELC does not have value by itself without the ERLD?

IMHO it makes sense to retain ELC as capability of the router (as specified
in the IGP specs) and position ERLD as a MSD sub-type for indicating the
limit. This way we have the flexibility of signalling ERLD both per node and
per ingress link/LC level.

Thanks,
Ketan

-----Original Message-----
From: Idr  On Behalf Of Van De Velde, Gunter (Nokia -
BE/Antwerp)
Sent: 12 June 2018 19:28
To: idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)

In LSR WG the following drafts document the signaling of ELC and RLD:
* draft-ietf-ospf-mpls-elc
* draft-ietf-isis-mpls-elc

When exporting this information using BGP-LS encoding to a controller, there
is need for BGP-LS extension by means of new TLVs.

BGP-LS is signaling ERLD (entropy capable readable label depth) ISIS/OSPF is
signaling individually ELC and RLD

I was working upon the IANA section, and discovered some inconsistency that
should be addressed:
* Why is IGP signaling individual ELC and RLD? ERLD is what was decided upon
(https://tools.ietf.org/html/draft-ietf-mpls-spring-entropy-label-10)
* What are the plans to request IANA code points for these drafts?
* (E)RLD seems to have meaning only from NODE perspective, (I assume that
LINK ERLD is not of any value at all, is that a correct assumption?)

G/


-----Original Message-----
From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of
internet-drafts@ietf.org
Sent: Tuesday, June 12, 2018 15:25
To: i-d-announce@ietf.org
Cc: idr@ietf.org
Subject: [Idr] I-D Action: draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt


A New Internet-Draft is available from the on-line Internet-Drafts
directories.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : Signalling ERLD using BGP-LS
        Authors         : Gunter Van de Velde
                          Wim Henderickx
                          Matthew Bocci
                          Keyur Patel
	Filename        : draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt
	Pages           : 6
	Date            : 2018-06-12

Abstract:
   This document defines the attribute encoding to use for BGP-LS to
   expose ERLD "Entropy capable Readable Label Depth" from a node to a
   centralised controller (PCE/SDN).



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-rld/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-rld-02
https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-ls-segment-routing-
rld-02

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-idr-bgp-ls-segment-routing-rld-
02


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/

_______________________________________________
Idr mailing list
Idr@ietf.org
https://www.ietf.org/mailman/listinfo/idr

_______________________________________________
Idr mailing list
Idr@ietf.org
https://www.ietf.org/mailman/listinfo/idr

_______________________________________________
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.

_______________________________________________
Idr mailing list
Idr@ietf.org
https://www.ietf.org/mailman/listinfo/idr

_______________________________________________
Idr mailing list
Idr@ietf.org
https://www.ietf.org/mailman/listinfo/idr






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Content-Transfer-Encoding: 7bit

<html><head></head><body><div dir="auto" style="direction: ltr; margin: 0; padding: 0; font-family: sans-serif; font-size: 11pt; color: black; ">Hope all is well with all.<br>
<br>
</div>
<div dir="auto" style="direction: ltr; margin: 0; padding: 0; font-family: sans-serif; font-size: 11pt; color: black; ">I'll be happy to discuss in Montreal. Between now and then i am on vscation, so no new text from my side. Lsts better discuss first at IETF102.<br>
<br>
</div>
<div dir="auto" style="direction: ltr; margin: 0; padding: 0; font-family: sans-serif; font-size: 11pt; color: black; ">G/<br>
<br>
</div>
<div dir="auto" style="direction: ltr; margin: 0; padding: 0; font-family: sans-serif; font-size: 11pt; color: black; "><div dir="auto" style="direction: ltr; margin: 0; padding: 0; font-family: sans-serif; font-size: 11pt; color: black; ">Gunter Van de Velde</div>
<br>
</div>
<br><br><br>
<div class="gmail_quote">On Fri, Jun 29, 2018 at 8:58 PM +0200, "Susan Hares" <span dir="ltr">&lt;<a href="mailto:shares@ndzh.com" target="_blank">shares@ndzh.com</a>&gt;</span> wrote:<br>
<br>

<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">




<div dir="3D&quot;ltr&quot;">
<pre>Stephane, Gunter, Ketan, Les, and Jeff:

Are you going to settle on option 2?  Will we be seeing drafts with this
change in this revision? 

Sue Hares 


-----Original Message-----
From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of
stephane.litkowski@orange.com
Sent: Wednesday, June 13, 2018 6:05 PM
To: Van De Velde, Gunter (Nokia - BE/Antwerp); Ketan Talaulikar (ketant);
idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: Re: [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)

Hi,

As defined in draft-ietf-mpls-spring-entropy-label, advertising an ERLD
means that the node is defacto ELC (so advertising ELC separately is not
necessary):

" The Entropy Readable Label Depth (ERLD) is defined as the number of
   labels a router can both:

   a.  Read in an MPLS packet received on its incoming interface(s)
       (starting from the top of the stack).

   b.  Use in its load-balancing function.

   The ERLD means that the router will perform load-balancing using the
   EL label if the EL is placed within the ERLD first labels.
"

"
To advertise an ERLD value, a SPRING router:

   o  MUST be entropy label capable and, as a consequence, MUST apply
      the dataplane procedures defined in [RFC6790].

   o  MUST be able to read an ELI/EL which is located within its ERLD
      value.

   o  MUST take into account this EL in its load-balancing function.
"


Brgds,


-----Original Message-----
From: Lsr [mailto:lsr-bounces@ietf.org] On Behalf Of Van De Velde, Gunter
(Nokia - BE/Antwerp)
Sent: Wednesday, June 13, 2018 11:10
To: Ketan Talaulikar (ketant); idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: Re: [Lsr] Signalling ERLD (ISIS, OSPF and BGP-LS)

It is desirable that same understanding of TLVs ([ELC, RLD] or [ERLD]) are
signaled for ISIS, OSPF and BGP-LS. 

If the WG's can manage to agree upon a decision (option1/2/3 or 4), then
next, have a look into how to encode the TLV so that we have a clean
technological solution space.

G/

-----Original Message-----
From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]
Sent: Wednesday, June 13, 2018 10:45
To: Van De Velde, Gunter (Nokia - BE/Antwerp)
<gunter.van_de_velde@nokia.com>; idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Hi Gunter,

In that case, I concur with you that option (2) is better than the others.
My only difference in opinion is that ERLD not have its own separate TLV but
instead get advertised as a new MSD sub-type - it is just a different
encoding.

Thanks,
Ketan

-----Original Message-----
From: Van De Velde, Gunter (Nokia - BE/Antwerp)
<gunter.van_de_velde@nokia.com>
Sent: 13 June 2018 13:55
To: Ketan Talaulikar (ketant) <ketant@cisco.com>; idr@ietf.org;
lsr@ietf.org; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Indeed, the debate that made BGP-LS to go down the ERLD path is of pragmatic
motivation.

The major Readable Label Depth use-case is entropy. Hence, if the ERLD TLV
is available, then ELC can be implicitly assumed. No pragmatic reason to
signal separately, as it just make things more complex then should be. 

&gt;From a holistic perspective having something similar, yet different, in
both IGP and BGP-LS encoding seems to make little sense and only bring
confusion (router/controller implementers and network operators). 

The ways to address this in IGP and BGP-LS going forward:
1) do nothing and leave all as it is (it has potential to create massive
confusion)
2) only signal ERLD TLV in IGP and BGP
3) signal ELC TLV and RLD TLV (unclear pragmatic value of explicit signaling
of ELC TLV compared to option (2))
4) signal ELC TLV, RLD TLV and ERLD TLV (it has all, but is much much more
complex as option (2))

I believe that option (2) is the best option:
* it bring the needed readable label depth value to operators
* most simple solution for implementers (routers and controller)
* easy to understand with no confusion
* is compliant with draft-ietf-mpls-spring-entropy-label-10

G/

-----Original Message-----
From: Ketan Talaulikar (ketant) [mailto:ketant@cisco.com]
Sent: Wednesday, June 13, 2018 08:05
To: Van De Velde, Gunter (Nokia - BE/Antwerp)
<gunter.van_de_velde@nokia.com>; idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: RE: Signalling ERLD (ISIS, OSPF and BGP-LS)

Hi Gunter,

The difference in IGP signalling seems to be because the ELC is a capability
which is advertised differently than ERLD which is a limit. Are you saying
that ELC does not have value by itself without the ERLD?

IMHO it makes sense to retain ELC as capability of the router (as specified
in the IGP specs) and position ERLD as a MSD sub-type for indicating the
limit. This way we have the flexibility of signalling ERLD both per node and
per ingress link/LC level.

Thanks,
Ketan

-----Original Message-----
From: Idr <idr-bounces@ietf.org> On Behalf Of Van De Velde, Gunter (Nokia -
BE/Antwerp)
Sent: 12 June 2018 19:28
To: idr@ietf.org; lsr@ietf.org; spring@ietf.org
Subject: [Idr] Signalling ERLD (ISIS, OSPF and BGP-LS)

In LSR WG the following drafts document the signaling of ELC and RLD:
* draft-ietf-ospf-mpls-elc
* draft-ietf-isis-mpls-elc

When exporting this information using BGP-LS encoding to a controller, there
is need for BGP-LS extension by means of new TLVs.

BGP-LS is signaling ERLD (entropy capable readable label depth) ISIS/OSPF is
signaling individually ELC and RLD

I was working upon the IANA section, and discovered some inconsistency that
should be addressed:
* Why is IGP signaling individual ELC and RLD? ERLD is what was decided upon
(https://tools.ietf.org/html/draft-ietf-mpls-spring-entropy-label-10)
* What are the plans to request IANA code points for these drafts?
* (E)RLD seems to have meaning only from NODE perspective, (I assume that
LINK ERLD is not of any value at all, is that a correct assumption?)

G/


-----Original Message-----
From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of
internet-drafts@ietf.org
Sent: Tuesday, June 12, 2018 15:25
To: i-d-announce@ietf.org
Cc: idr@ietf.org
Subject: [Idr] I-D Action: draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt


A New Internet-Draft is available from the on-line Internet-Drafts
directories.
This draft is a work item of the Inter-Domain Routing WG of the IETF.

        Title           : Signalling ERLD using BGP-LS
        Authors         : Gunter Van de Velde
                          Wim Henderickx
                          Matthew Bocci
                          Keyur Patel
	Filename        : draft-ietf-idr-bgp-ls-segment-routing-rld-02.txt
	Pages           : 6
	Date            : 2018-06-12

Abstract:
   This document defines the attribute encoding to use for BGP-LS to
   expose ERLD "Entropy capable Readable Label Depth" from a node to a
   centralised controller (PCE/SDN).



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-idr-bgp-ls-segment-routing-rld/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-idr-bgp-ls-segment-routing-rld-02
https://datatracker.ietf.org/doc/html/draft-ietf-idr-bgp-ls-segment-routing-
rld-02

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-idr-bgp-ls-segment-routing-rld-
02


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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</idr-bounces@ietf.org></gunter.van_de_velde@nokia.com></ketant@cisco.com></gunter.van_de_velde@nokia.com></gunter.van_de_velde@nokia.com></pre>
</div>

</blockquote>
</div>
</body></html>
------=_Part_6218_1609624426.1530301709928--


From nobody Fri Jun 29 14:56:21 2018
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Subject: [Lsr] I-D Action: draft-ietf-isis-sr-yang-04.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           : YANG Data Model for IS-IS Segment Routing
        Authors         : Stephane Litkowski
                          Yinghzen Qu
                          Pushpasis Sarkar
                          Ing-Wher Chen
                          Jeff Tantsura
	Filename        : draft-ietf-isis-sr-yang-04.txt
	Pages           : 24
	Date            : 2018-06-29

Abstract:
   This document defines a YANG data model that can be used to configure
   and manage IS-IS Segment Routing
   ([I-D.ietf-isis-segment-routing-extensions].



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-isis-sr-yang/

There are also htmlized versions available at:
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https://datatracker.ietf.org/doc/html/draft-ietf-isis-sr-yang-04

A diff from the previous version is available at:
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Please note that it may take a couple of minutes from the time of submission
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From nobody Fri Jun 29 15:31:46 2018
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FYI:

This is a proposal to improve the way that IS-IS does areas.  A level 1 =
area can now be a transit without injecting its topology into level 2.

As always, comments are most welcome.

Regards,
Tony


> Begin forwarded message:
>=20
> From: internet-drafts@ietf.org
> Subject: New Version Notification for draft-li-area-abstraction-00.txt
> Date: June 29, 2018 at 3:28:05 PM PDT
> To: "Tony Li" <tony.li@tony.li>
>=20
>=20
> A new version of I-D, draft-li-area-abstraction-00.txt
> has been successfully submitted by Tony Li and posted to the
> IETF repository.
>=20
> Name:		draft-li-area-abstraction
> Revision:	00
> Title:		Level 1 Area Abstraction for IS-IS
> Document date:	2018-06-28
> Group:		Individual Submission
> Pages:		6
> URL:            =
https://www.ietf.org/internet-drafts/draft-li-area-abstraction-00.txt
> Status:         =
https://datatracker.ietf.org/doc/draft-li-area-abstraction/
> Htmlized:       =
https://tools.ietf.org/html/draft-li-area-abstraction-00
> Htmlized:       =
https://datatracker.ietf.org/doc/html/draft-li-area-abstraction
>=20
>=20
> 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, leading to scale issues.
>=20
>   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 topology into level 2.
>=20
>=20
>=20
>=20
> 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.
>=20
> The IETF Secretariat
>=20


--Apple-Mail=_3CC0EC12-4C64-4517-BDA4-A25E9F585CC3
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	charset=us-ascii

<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""><div =
class=3D""><br class=3D""></div>FYI:<div class=3D""><br =
class=3D""></div><div class=3D"">This is a proposal to improve the way =
that IS-IS does areas. &nbsp;A level 1 area can now be a transit without =
injecting its topology into level 2.</div><div class=3D""><br =
class=3D""></div><div class=3D"">As always, comments are most =
welcome.</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><br class=3D""><blockquote type=3D"cite" class=3D""><div =
class=3D"">Begin forwarded message:</div><br =
class=3D"Apple-interchange-newline"><div style=3D"margin-top: 0px; =
margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=3D""><span=
 style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica, =
sans-serif; color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">From: =
</b></span><span style=3D"font-family: -webkit-system-font, Helvetica =
Neue, Helvetica, sans-serif;" class=3D""><a =
href=3D"mailto:internet-drafts@ietf.org" =
class=3D"">internet-drafts@ietf.org</a><br class=3D""></span></div><div =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px;" class=3D""><span style=3D"font-family: =
-webkit-system-font, Helvetica Neue, Helvetica, sans-serif; =
color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">Subject: =
</b></span><span style=3D"font-family: -webkit-system-font, Helvetica =
Neue, Helvetica, sans-serif;" class=3D""><b class=3D"">New Version =
Notification for draft-li-area-abstraction-00.txt</b><br =
class=3D""></span></div><div style=3D"margin-top: 0px; margin-right: =
0px; margin-bottom: 0px; margin-left: 0px;" class=3D""><span =
style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica, =
sans-serif; color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">Date: =
</b></span><span style=3D"font-family: -webkit-system-font, Helvetica =
Neue, Helvetica, sans-serif;" class=3D"">June 29, 2018 at 3:28:05 PM =
PDT<br class=3D""></span></div><div style=3D"margin-top: 0px; =
margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=3D""><span=
 style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica, =
sans-serif; color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">To: =
</b></span><span style=3D"font-family: -webkit-system-font, Helvetica =
Neue, Helvetica, sans-serif;" class=3D"">"Tony Li" &lt;<a =
href=3D"mailto:tony.li@tony.li" class=3D"">tony.li@tony.li</a>&gt;<br =
class=3D""></span></div><br class=3D""><div class=3D""><div class=3D""><br=
 class=3D"">A new version of I-D, draft-li-area-abstraction-00.txt<br =
class=3D"">has been successfully submitted by Tony Li and posted to =
the<br class=3D"">IETF repository.<br class=3D""><br class=3D"">Name:<span=
 class=3D"Apple-tab-span" style=3D"white-space:pre">	</span><span =
class=3D"Apple-tab-span" style=3D"white-space:pre">	=
</span>draft-li-area-abstraction<br class=3D"">Revision:<span =
class=3D"Apple-tab-span" style=3D"white-space:pre">	</span>00<br =
class=3D"">Title:<span class=3D"Apple-tab-span" style=3D"white-space:pre">=
	</span><span class=3D"Apple-tab-span" style=3D"white-space:pre">	=
</span>Level 1 Area Abstraction for IS-IS<br class=3D"">Document =
date:<span class=3D"Apple-tab-span" style=3D"white-space:pre">	=
</span>2018-06-28<br class=3D"">Group:<span class=3D"Apple-tab-span" =
style=3D"white-space:pre">	</span><span class=3D"Apple-tab-span" =
style=3D"white-space:pre">	</span>Individual Submission<br =
class=3D"">Pages:<span class=3D"Apple-tab-span" style=3D"white-space:pre">=
	</span><span class=3D"Apple-tab-span" style=3D"white-space:pre">	=
</span>6<br class=3D"">URL: =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a =
href=3D"https://www.ietf.org/internet-drafts/draft-li-area-abstraction-00.=
txt" =
class=3D"">https://www.ietf.org/internet-drafts/draft-li-area-abstraction-=
00.txt</a><br class=3D"">Status: =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a =
href=3D"https://datatracker.ietf.org/doc/draft-li-area-abstraction/" =
class=3D"">https://datatracker.ietf.org/doc/draft-li-area-abstraction/</a>=
<br class=3D"">Htmlized: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a =
href=3D"https://tools.ietf.org/html/draft-li-area-abstraction-00" =
class=3D"">https://tools.ietf.org/html/draft-li-area-abstraction-00</a><br=
 class=3D"">Htmlized: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a =
href=3D"https://datatracker.ietf.org/doc/html/draft-li-area-abstraction" =
class=3D"">https://datatracker.ietf.org/doc/html/draft-li-area-abstraction=
</a><br class=3D""><br class=3D""><br class=3D"">Abstract:<br class=3D""> =
&nbsp;&nbsp;Link state routing protocols have hierarchical abstraction =
already<br class=3D""> &nbsp;&nbsp;built into them. &nbsp;However, when =
lower levels are used for transit,<br class=3D""> &nbsp;&nbsp;they must =
expose their internal topologies, leading to scale issues.<br =
class=3D""><br class=3D""> &nbsp;&nbsp;To avoid this, this document =
discusses extensions to the IS-IS<br class=3D""> &nbsp;&nbsp;routing =
protocol that would allow level 1 areas to provide transit,<br class=3D"">=
 &nbsp;&nbsp;yet only inject an abstraction of the topology into level =
2.<br class=3D""><br class=3D""><br class=3D""><br class=3D""><br =
class=3D"">Please note that it may take a couple of minutes from the =
time of submission<br class=3D"">until the htmlized version and diff are =
available at <a href=3D"http://tools.ietf.org" =
class=3D"">tools.ietf.org</a>.<br class=3D""><br class=3D"">The IETF =
Secretariat<br class=3D""><br =
class=3D""></div></div></blockquote></div><br =
class=3D""></div></body></html>=

--Apple-Mail=_3CC0EC12-4C64-4517-BDA4-A25E9F585CC3--


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FYI:

This extends IS-IS from 2 levels to 8.

Comments are most welcome!

Regards,
Tony



> Begin forwarded message:
>=20
> From: internet-drafts@ietf.org
> Subject: New Version Notification for =
draft-li-hierarchical-isis-00.txt
> Date: June 29, 2018 at 4:12:24 PM PDT
> To: "Tony Li" <tony.li@tony.li>
>=20
>=20
> A new version of I-D, draft-li-hierarchical-isis-00.txt
> has been successfully submitted by Tony Li and posted to the
> IETF repository.
>=20
> Name:		draft-li-hierarchical-isis
> Revision:	00
> Title:		Hierarchical IS-IS
> Document date:	2018-06-28
> Group:		Individual Submission
> Pages:		7
> URL:            =
https://www.ietf.org/internet-drafts/draft-li-hierarchical-isis-00.txt
> Status:         =
https://datatracker.ietf.org/doc/draft-li-hierarchical-isis/
> Htmlized:       =
https://tools.ietf.org/html/draft-li-hierarchical-isis-00
> Htmlized:       =
https://datatracker.ietf.org/doc/html/draft-li-hierarchical-isis
>=20
>=20
> Abstract:
>   The IS-IS routing protocol was originally defined with a two level
>   hierarchical structure.  This was adequate for the networks at the
>   time.  As we continue to expand the scale of our networks, it is
>   apparent that additional hierarchy would be a welcome degree of
>   flexibility in network design.
>=20
>   This document defines IS-IS Levels 3 through 8.
>=20
>=20
>=20
>=20
> 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.
>=20
> The IETF Secretariat
>=20


--Apple-Mail=_ECB89D8B-530D-4215-8C58-8AA307011CE5
Content-Transfer-Encoding: quoted-printable
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	charset=us-ascii

<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""><div =
class=3D""><br class=3D""></div><div class=3D""><br =
class=3D""></div>FYI:<div class=3D""><br class=3D""></div><div =
class=3D"">This extends IS-IS from 2 levels to 8.</div><div class=3D""><br=
 class=3D""></div><div class=3D"">Comments are most welcome!</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><div =
class=3D""><br class=3D""><div><br class=3D""><blockquote type=3D"cite" =
class=3D""><div class=3D"">Begin forwarded message:</div><br =
class=3D"Apple-interchange-newline"><div style=3D"margin-top: 0px; =
margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=3D""><span=
 style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica, =
sans-serif; color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">From: =
</b></span><span style=3D"font-family: -webkit-system-font, Helvetica =
Neue, Helvetica, sans-serif;" class=3D""><a =
href=3D"mailto:internet-drafts@ietf.org" =
class=3D"">internet-drafts@ietf.org</a><br class=3D""></span></div><div =
style=3D"margin-top: 0px; margin-right: 0px; margin-bottom: 0px; =
margin-left: 0px;" class=3D""><span style=3D"font-family: =
-webkit-system-font, Helvetica Neue, Helvetica, sans-serif; =
color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">Subject: =
</b></span><span style=3D"font-family: -webkit-system-font, Helvetica =
Neue, Helvetica, sans-serif;" class=3D""><b class=3D"">New Version =
Notification for draft-li-hierarchical-isis-00.txt</b><br =
class=3D""></span></div><div style=3D"margin-top: 0px; margin-right: =
0px; margin-bottom: 0px; margin-left: 0px;" class=3D""><span =
style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica, =
sans-serif; color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">Date: =
</b></span><span style=3D"font-family: -webkit-system-font, Helvetica =
Neue, Helvetica, sans-serif;" class=3D"">June 29, 2018 at 4:12:24 PM =
PDT<br class=3D""></span></div><div style=3D"margin-top: 0px; =
margin-right: 0px; margin-bottom: 0px; margin-left: 0px;" class=3D""><span=
 style=3D"font-family: -webkit-system-font, Helvetica Neue, Helvetica, =
sans-serif; color:rgba(0, 0, 0, 1.0);" class=3D""><b class=3D"">To: =
</b></span><span style=3D"font-family: -webkit-system-font, Helvetica =
Neue, Helvetica, sans-serif;" class=3D"">"Tony Li" &lt;<a =
href=3D"mailto:tony.li@tony.li" class=3D"">tony.li@tony.li</a>&gt;<br =
class=3D""></span></div><br class=3D""><div class=3D""><div class=3D""><br=
 class=3D"">A new version of I-D, draft-li-hierarchical-isis-00.txt<br =
class=3D"">has been successfully submitted by Tony Li and posted to =
the<br class=3D"">IETF repository.<br class=3D""><br class=3D"">Name:<span=
 class=3D"Apple-tab-span" style=3D"white-space:pre">	</span><span =
class=3D"Apple-tab-span" style=3D"white-space:pre">	=
</span>draft-li-hierarchical-isis<br class=3D"">Revision:<span =
class=3D"Apple-tab-span" style=3D"white-space:pre">	</span>00<br =
class=3D"">Title:<span class=3D"Apple-tab-span" style=3D"white-space:pre">=
	</span><span class=3D"Apple-tab-span" style=3D"white-space:pre">	=
</span>Hierarchical IS-IS<br class=3D"">Document date:<span =
class=3D"Apple-tab-span" style=3D"white-space:pre">	=
</span>2018-06-28<br class=3D"">Group:<span class=3D"Apple-tab-span" =
style=3D"white-space:pre">	</span><span class=3D"Apple-tab-span" =
style=3D"white-space:pre">	</span>Individual Submission<br =
class=3D"">Pages:<span class=3D"Apple-tab-span" style=3D"white-space:pre">=
	</span><span class=3D"Apple-tab-span" style=3D"white-space:pre">	=
</span>7<br class=3D"">URL: =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a =
href=3D"https://www.ietf.org/internet-drafts/draft-li-hierarchical-isis-00=
.txt" =
class=3D"">https://www.ietf.org/internet-drafts/draft-li-hierarchical-isis=
-00.txt</a><br class=3D"">Status: =
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a =
href=3D"https://datatracker.ietf.org/doc/draft-li-hierarchical-isis/" =
class=3D"">https://datatracker.ietf.org/doc/draft-li-hierarchical-isis/</a=
><br class=3D"">Htmlized: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a =
href=3D"https://tools.ietf.org/html/draft-li-hierarchical-isis-00" =
class=3D"">https://tools.ietf.org/html/draft-li-hierarchical-isis-00</a><b=
r class=3D"">Htmlized: &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<a =
href=3D"https://datatracker.ietf.org/doc/html/draft-li-hierarchical-isis" =
class=3D"">https://datatracker.ietf.org/doc/html/draft-li-hierarchical-isi=
s</a><br class=3D""><br class=3D""><br class=3D"">Abstract:<br class=3D"">=
 &nbsp;&nbsp;The IS-IS routing protocol was originally defined with a =
two level<br class=3D""> &nbsp;&nbsp;hierarchical structure. &nbsp;This =
was adequate for the networks at the<br class=3D""> &nbsp;&nbsp;time. =
&nbsp;As we continue to expand the scale of our networks, it is<br =
class=3D""> &nbsp;&nbsp;apparent that additional hierarchy would be a =
welcome degree of<br class=3D""> &nbsp;&nbsp;flexibility in network =
design.<br class=3D""><br class=3D""> &nbsp;&nbsp;This document defines =
IS-IS Levels 3 through 8.<br class=3D""><br class=3D""><br class=3D""><br =
class=3D""><br class=3D"">Please note that it may take a couple of =
minutes from the time of submission<br class=3D"">until the htmlized =
version and diff are available at <a href=3D"http://tools.ietf.org" =
class=3D"">tools.ietf.org</a>.<br class=3D""><br class=3D"">The IETF =
Secretariat<br class=3D""><br =
class=3D""></div></div></blockquote></div><br =
class=3D""></div></body></html>=

--Apple-Mail=_ECB89D8B-530D-4215-8C58-8AA307011CE5--

