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From: Wen Lin <wlin@juniper.net>
To: Ryan Bickhart <rbickhart=40juniper.net@dmarc.ietf.org>, Sandy Breeze <sandy.breeze=40eu.clara.net@dmarc.ietf.org>, "bess@ietf.org" <bess@ietf.org>
Thread-Topic: [bess] Question about draft-rbickhart-evpn-ip-mac-proxy-adv
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/hsvAcRjkgMcGQ7B7PWEPR1Ot3xA>
Subject: Re: [bess] Question about draft-rbickhart-evpn-ip-mac-proxy-adv
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From: <stephane.litkowski@orange.com>
To: "bess@ietf.org" <bess@ietf.org>, "draft-ietf-bess-service-chaining@ietf.org" <draft-ietf-bess-service-chaining@ietf.org>
Thread-Topic: Poll to continue or not the work on draft-ietf-bess-service-chaining
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Date: Wed, 3 Apr 2019 12:34:40 +0000
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Subject: [bess] Poll to continue or not the work on draft-ietf-bess-service-chaining
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Hi WG,

As pointed on the mailing list and during our session in Prague (IETF 104),=
 the shepherd's review of draft-ietf-bess-service-chaining [1] has identifi=
ed major issues that make the document far from being ready.

As the document is targeted to be standard track, the work to make it ready=
 is quite huge and we, chairs, are wondering if the WG still supports this =
work.
The current proposal from the authors is to split the document: one informa=
tional, one standard track (containing the BGP extensions). The work remain=
s huge. While we are happy to hear about this proposal, we need to ensure t=
hat the WG supports this proposal and will be kind to review/comment the ne=
w drafts.

This email starts a 2 weeks poll to determine if the work on this document =
should continue or if this document should be parked.
Please answer to this poll telling us if you want to support this document =
(you so commit on commenting and reviewing it) or if you don't support. In =
both cases, please explain why.
Authors should also commit on the roadmap for the document split/update.

The poll ends on Wed 17th April.

[1] https://datatracker.ietf.org/doc/draft-ietf-bess-service-chaining/


Stephane & Matthew

___________________________________________________________________________=
______________________________________________

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a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el=
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Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

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Thank you.


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<p class=3D"MsoNormal">Hi WG,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">As pointed on the mailing list and during our sessio=
n in Prague (IETF 104), the shepherd&#8217;s review of draft-ietf-bess-serv=
ice-chaining [1] has identified major issues that make the document far fro=
m being ready.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">As the document is targeted to be standard track, th=
e work to make it ready is quite huge and we, chairs, are wondering if the =
WG still supports this work.<o:p></o:p></p>
<p class=3D"MsoNormal">The current proposal from the authors is to split th=
e document: one informational, one standard track (containing the BGP exten=
sions). The work remains huge. While we are happy to hear about this propos=
al, we need to ensure that the WG
 supports this proposal and will be kind to review/comment the new drafts.<=
o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">This email starts a 2 weeks poll to determine if the=
 work on this document should continue or if this document should be parked=
.<o:p></o:p></p>
<p class=3D"MsoNormal">Please answer to this poll telling us if you want to=
 support this document (you so commit on commenting and reviewing it) or if=
 you don&#8217;t support. In both cases, please explain why.<o:p></o:p></p>
<p class=3D"MsoNormal">Authors should also commit on the roadmap for the do=
cument split/update.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The poll ends on Wed 17<sup>th</sup> April.<o:p></o:=
p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">[1] <a href=3D"https://datatracker.ietf.org/doc/draf=
t-ietf-bess-service-chaining/">
https://datatracker.ietf.org/doc/draft-ietf-bess-service-chaining/</a><o:p>=
</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ti=
mes New Roman&quot;,&quot;serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ti=
mes New Roman&quot;,&quot;serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ti=
mes New Roman&quot;,&quot;serif&quot;">Stephane &amp; Matthew<o:p></o:p></s=
pan></p>
</div>
<PRE>______________________________________________________________________=
___________________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l'expediteur et le detruire ainsi que les pieces jointes. Les messages el=
ectroniques etant susceptibles d'alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.
Thank you.
</PRE></body>
</html>

--_000_9E32478DFA9976438E7A22F69B08FF924C1D8320OPEXCAUBMA3corp_--


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Subject: Re: [bess] Poll to continue or not the work on draft-ietf-bess-service-chaining
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From: <stephane.litkowski@orange.com>
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Thread-Topic: Poll to progress draft-ietf-bess-nsh-bgp-controlplane without implementation
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Hi WG,

draft-ietf-bess-nsh-bgp-controlplane has passed WGLC and its finishing the =
shepherd's review phasis (I-D update required). It is in a good shape to pr=
ogress further. However we are not aware of any implementation. As per our =
Implementation Requirement Policy, we need to poll the WG to know if WG agr=
ees to progress the document without implementation.

This email starts a 2 weeks poll closing on 04/18/2019.

Please raise your support or any concern regarding the progress of this doc=
ument without implementation.
If you are aware of any implementation, please also state it.


https://datatracker.ietf.org/doc/draft-ietf-bess-nsh-bgp-control-plane/

Brgds,

Stephane & Matthew

___________________________________________________________________________=
______________________________________________

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<p class=3D"MsoNormal">Hi WG,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">draft-ietf-bess-nsh-bgp-controlplane has passed WGLC=
 and its finishing the shepherd&#8217;s review phasis (I-D update required)=
. It is in a good shape to progress further. However we are not aware of an=
y implementation. As per our Implementation
 Requirement Policy, we need to poll the WG to know if WG agrees to progres=
s the document without implementation.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">This email starts a 2 weeks poll closing on 04/18/20=
19.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Please raise your support or any concern regarding t=
he progress of this document without implementation.<o:p></o:p></p>
<p class=3D"MsoNormal">If you are aware of any implementation, please also =
state it.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><a href=3D"https://datatracker.ietf.org/doc/draft-ie=
tf-bess-nsh-bgp-control-plane/">https://datatracker.ietf.org/doc/draft-ietf=
-bess-nsh-bgp-control-plane/</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Brgds,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Stephane &amp; Matthew<o:p></o:p></p>
</div>
<PRE>______________________________________________________________________=
___________________________________________________

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tielles ou privilegiees et ne doivent donc
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Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
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modified, changed or falsified.
Thank you.
</PRE></body>
</html>

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From nobody Thu Apr  4 08:12:59 2019
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Mirja Kühlewind has entered the following ballot position for
draft-ietf-bess-bgp-vpls-control-flags-07: No Objection

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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

Given this document updates the normative behaviour of RFC 4761, I would have
expected to see some discussion about interoperability. Is the behaviour as
specified in RFC 4761 not widely deployed/implemented or would it be possible
to add some sentences about interoperability which already deployed devices?

One minor editorial request:
- Please expand PE on first occurrence.



From nobody Thu Apr  4 16:05:10 2019
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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Thu, 4 Apr 2019 16:04:42 -0700
Message-ID: <CA+RyBmV6oigz+ODY9C6QEqkDQY1X+x=yDpWqPoiODyyqVeTwHA@mail.gmail.com>
To: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
Cc: "EXT - thomas.morin@orange.com" <thomas.morin@orange.com>, Robert Kebler <rkebler@juniper.net>,  "bess-chairs@ietf.org" <bess-chairs@ietf.org>, BESS <bess@ietf.org>
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Subject: Re: [bess] WGLC, IPR and implementation poll for draft-ietf-bess-mvpn-fast-failover
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Hi Jeffrey,
many thanks to you and Sandy for taking the time to review the remaining
questions in Prague. Attached please find the updated version -06 and its
diff to highlight the latest changes.

Regards,
Greg

On Thu, Mar 14, 2019 at 3:04 AM Jeffrey (Zhaohui) Zhang <zzhang@juniper.net=
>
wrote:

> Thomas, Bob,
>
>
>
> Some questions below for you. Some old, and some new.
>
>
>
> Greg,
>
>
>
> Sorry for the late response.
>
> Please see zzh> below. I trimmed some points that we agree on.
>
>
>
> *From:* Greg Mirsky <gregimirsky@gmail.com>
> *Sent:* Wednesday, December 5, 2018 1:38 PM
> *To:* Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>
> *Cc:* EXT - thomas.morin@orange.com <thomas.morin@orange.com>; Robert
> Kebler <rkebler@juniper.net>; bess-chairs@ietf.org; BESS <bess@ietf.org>
> *Subject:* Re: [bess] WGLC, IPR and implementation poll for
> draft-ietf-bess-mvpn-fast-failover
>
>
>
> Hi Jeffrey,
>
> thank you for the review, detailed questions and helpful comments. Please
> find my notes, answers in-line tagged GIM>>.
>
>
>
> Regards,
>
> Greg
>
>
>
> On Fri, Nov 30, 2018 at 5:14 PM Jeffrey (Zhaohui) Zhang <
> zzhang@juniper.net> wrote:
>
> Hi,
>
>
>
> I have the following questions/comments:
>
>
>
>    The procedure described here is an OPTIONAL procedure that consists
>
>    of having a downstream PE take into account the status of P-tunnels
>
>    rooted at each possible upstream PEs, for including or not including
>
>    each given PE in the list of candidate UMHs for a given (C-S,C-G)
>
>    state.  The result is that, if a P-tunnel is "down" (see
>
>    Section 3.1), the PE that is the root of the P-tunnel will not be
>
>    considered for UMH selection, which will result in the downstream PE
>
>    to failover to the upstream PE which is next in the list of
>
>    candidates.
>
>
>
> Is it possible that a p2mp tunnel is considered up by some leaves but dow=
n
> by some other leaves, leaving to them choosing different UMH? In that cas=
e,
> procedures described in Section 9.1.1 ("Discarding Packets from Wrong PE"=
)
> of RFC 6513 must be used. I see that this is actually pointed out later i=
n
> section 6 =E2=80=93 good to have a pointer to it right here.
>
> GIM>> Would the following new text that follows the quoted text address
> your concern:
>
> NEW TEXT:
>
>    If rules to determine the state of the P-tunnel are not
>
>    consistent across all PEs, then some may arrive at a different
>
>    conclusion regarding the state of the tunnel, In such a scenario,
>
>    procedures described in Section 9.1.1 of [RFC 6513] MUST be used
>


> GIM>> Accepted
>



> Zzh> It=E2=80=99s not that the =E2=80=9Crules =E2=80=A6 are not consisten=
t=E2=80=9D. It=E2=80=99s that by nature
> some PEs may think the tunnel is down while the others may think the tunn=
el
> is still up (because they=E2=80=99re on different tunnel branches), even =
when they
> follow the same rules. Traffic duplication in this case is also only with
> inclusive tunnels =E2=80=93 so how about the following?
>
>
>
>    Because all PEs may arrive at a different
>
>    conclusion regarding the state of the tunnel,
>
>    procedures described in Section 9.1.1 of [RFC 6513] MUST be used
>
>    when using inclusive tunnels.
>
>
>
> Additionally, the text in section 3 seems to be more biased on Single
> Forwarder Election choosing the UMH with the highest IP address. Section =
5
> of RFC6513 also describes two other options, hashing or based on =E2=80=
=9Cinstalled
> UMH route=E2=80=9D (aka unicast-based). It is not clear how the text in t=
his
> document applies to hashing based selection, and I don=E2=80=99t see how =
the text
> applies to unicast-based selection. Some rewording/clarification are need=
ed
> here.
>
> GIM>> How would the use of an alternative UMH selection algorithm change
> documented use of p2mp BFD? Do you think that if the Upstream PE selected
> using, for example, hashing then defined use of BGP-BFD and p2mp BFD itse=
lf
> no longer applicable?
>
>
>
> Zzh> It=E2=80=99s not that the alternative UMH selection algorithm change
> documented use of p2mp BFD. It=E2=80=99s the other way around =E2=80=93 t=
unnel state
> changes the selection result. I guess hashing can still be used (this
> document only controls what goes into the candidate pool). For unicast
> based selection I thought it=E2=80=99d no longer work, but then I noticed=
 the
> following:
>
>
>
>    o  second, the UMH candidates that advertise a PMSI bound to a tunnel
>
>       that is "down" -- these will thus be used as a last resort to
>
>       ensure a graceful fallback to the basic MVPN UMH selection
>
>       procedures in the hypothetical case where a false negative would
>
>       occur when determining the status of all tunnels
>
>
>
> Zzh> So this should still work, although Ideally, the PE advertising the
> next best route should be considered before going to the last resort (of
> using the PE advertising the best route but whose tunnel is down).
>
>
>
>    For P-tunnels of type P2MP MPLS-TE, the status of the P-tunnel is
>
>    considered up if one or more of the P2MP RSVP-TE LSPs, identified by
>
>    the P-tunnel Attribute, are in Up state.
>
>
>
> Why is =E2=80=9Cone or more of =E2=80=A6=E2=80=9D used in the above text?
>
> GIM>> Clariy "to the same PE"

> GIM>> Would s/one or more of/at least one of/ address your concern?
>
>
>
> Zzh> Still confused. From the tunnel head, indeed it could send setup
> multiple (sub-)LSPs, one for each leaf. From the egress point of view,
> there is only one LSP for an egress PE, right?
>
>
>
>    If tracking of the P-tunnel by using a p2mp BFD session is to be
>
>    enabled after the P-tunnel has been already signaled, the the
>
>    procedure described above MUST be followed.
>
>
>
> What if the tracking is to be enabled before the P-tunnel has been
> signaled? The text implies different behavior?
>
> GIM>> Not really, I guess. I think that the second sentence is important:
>
>    Note that x-PMSI A-D Route MUST be re-sent with exactly the same
> attributes as before and
>
>    the BGP-BFD Attribute included.
>
>
>
> Zzh> In that case, how about changing the paragraph and the next one to
> the following:
>
>
>
>    If tracking of the P-tunnel by using a p2mp BFD session is
>
>   enabled after the x-PMSI A-D route has been already advertised,
>
>    the x-PMSI A-D
>
>    Route MUST be re-sent with exactly the same attributes as before and
>
>    the BGP-BFD Attribute included.
>
>
>
>    If the x-PMSI A-D route is advertised with P-tunnel status tracked
> using
>
>    the p2mp BFD session and it is desired to stop tracking P-tunnel
>
>    status using BFD, then:
>
>
> GIM>> Agree


> zzh> BTW, the same applies to 3.1.7 as well.
>
GIM>> Agree

>
>
>    When such a procedure is used, in the context where fast restoration
>
>    mechanisms are used for the P-tunnels, leaf PEs should be configured
>
>    to wait before updating the UMH, to let the P-tunnel restoration
>
>    mechanism happen.  A configurable timer MUST be provided for this
>
>    purpose, and it is recommended to provide a reasonable default value
>
>    for this timer.
>
>
>
> What does =E2=80=9Csuch a procedure=E2=80=9D refers to?
>
> GIM>> Would s/When such a procedure is used/In such a scenario/
>
>
>
> Zzh> I looked at the surrounding (new) text:
>
>
>
>    If the Downstream PE's P-tunnel is already up, its state being
>
>    monitored by the p2mp BFD session, and the Downstream PE receives the
>
>    new x-PMSI A-D Route without the BGP-BFD Attribute, the Downstream
>
>    PE:
>
>
>
>    o  MUST accept the x-PMSI A-D Route;
>
>
>
>    o  MUST stop receiving BFD control packets for this p2mp BFD session;
>
>
>
>    o  SHOULD delete the p2mp BFD session associated with the P-tunnel;
>
>
>
>    o  SHOULD NOT switch the traffic to the Standby Upstream PE.
>
>
>
>    In such a scenario, in the context where fast restoration mechanisms
>
>    are used for the P-tunnels, leaf PEs should be configured to wait
>
>    before updating the UMH, to let the P-tunnel restoration mechanism
>
>    happen.
>
GIM>> Remove the last paragraph?

>
>
> Zzh> Now I have the following two questions:
>
> Zzh> a) Should the =E2=80=9CMUST stop receiving BFD control packets for t=
his p2mp
> BFD session=E2=80=9D be removed? How would you =E2=80=9Cstop receiving BF=
D control
> packets=E2=80=9D? Isn=E2=80=99t it implied by the next bullet point alrea=
dy?
>
> Zzh> b) What does the last clause =E2=80=9Cto let the P-tunnel restoratio=
n
> mechanism happen=E2=80=9D mean? The scenario is that an x-PMSI route upda=
te is
> received w/o the BGP-BFD attribute =E2=80=93 where does the tunnel restor=
ation come
> from?
>
>
>
> 3.1.7.  Per PE-CE link BFD Discriminator
>
>
>
>    The following approach is defined for the fast failover in response
>
>    to the detection of PE-CE link failures, in which UMH selection for a
>
>    given C-multicast route takes into account the state of the BFD
>
>    session associated with the state of the upstream PE-CE link.
>
>
>
> 3.1.7.1.  Upstream PE Procedures
>
>
>
>    For each protected PE-CE link, the upstream PE initiates a multipoint
>
>    BFD session [I-D.ietf-bfd-multipoint] as MultipointHead toward
>
>    downstream PEs.  A downstream PE monitors the state of the p2mp
>
>    session as MultipointTail and MAY interpret transition of the BFD
>
>    session into Down state as the indication of the associated PE-CE
>
>    link being down.
>
>
>
> Since the BFD packets are sent over the P2MP tunnel not the PE-CE link, m=
y
> understanding is that the BFD discriminator is still for the tunnel and n=
ot
> tied to the PE-CE link; but different from the previous case, the root wi=
ll
> stop sending BFD messages when it detects the PE-CE link failure. As far =
as
> the egress PEs are concerned, they don=E2=80=99t know if it is the tunnel=
 failure
> or PE-CE link failure.
>
>
>
> If my understanding is correct, the wording should be changed.
>
> GIM>> There are other than stopping transmission of BFD control packets
> ways to distinguish two conditions for the egress PE. For example, the
> MultipointHead MAY set the State to AdminDown and continue sending BFD
> control packets. If and when PE-CE link restored to Up, the MultipointHea=
d
> can set the state to Up in the BFD control packet.
>
>
>
>    =E2=80=A6  If the route to the
>
>    src/RP changes such that the RPF interface is changed to be a new PE-
>
>    CE interface, then the upstream PE will update the S-PMSI A-D route
>
>    with included BGP-BFD Attribute so that value of the BFD
>
>    Discriminator is associated with the new RPF link.
>
>
>
> If the RPF interface changes on the upstream PE, why should it update the
> route to send a new discriminator? As long as there is a new RPF interfac=
e
> couldn=E2=80=99t the upstream PE do nothing but start tracking the new RP=
F
> interface?
>
> GIM>> I'll defer this one to Thomas and Rob.
>
>
>
> Zzh> I re-read section 3.1.6 and 3.1.7 and have more questions =F0=9F=98=
=8A
>
> Zzh> 3.1.6 seems to be about tracking tunnel itself while 3.1.7 is about
> tracking PE-CE interfaces. From an egress point of view, (how) does it kn=
ow
> if the discriminator is for the tunnel or for PE-CE interface 1 or PE-CE
> interface 2? Does it even care? It seems to me that an egress PE would no=
t
> need to care. If so, why are there different procedures for 3.1.6/3.1.7 (=
at
> least for the egress PE behavior)? Even for the upstream PE behavior,
> shouldn=E2=80=99t 3.1.6.1 apply to 3.1.7 as well?
>
GIM>> Added the following text to the first paragraph of section 3.1.7:
NEW TEXT:
The mechanism to communicate the mapping between the PE-CE link
and the associated BFD session is outside the scope of this document.

>
>
> Regardless which way (the currently described way and my imagined way),
> some text should be added to discuss how the downstream would not switch =
to
> another upstream PE when the primary PE is just going through a RPF chang=
e.
>
> GIM>>  Would appending the following text be acceptable to address your
> concern:
>
> NEW TEXT:
>
>    To avoid unwarranted switchover a downstream PE MUST gracefully handle
> the
>
>    updated S-PMSI A-D route and switch to the use of the associated BFD
>
>    Discriminator value.
>
>
>
> 4.  Standby C-multicast route
>
>
>
>    The procedures described below are limited to the case where the site
>
>    that contains C-S is connected to exactly two PEs. The procedures
>
>    require all the PEs of that MVPN to follow the single forwarder PE
>
>    selection, as specified in [RFC6513].
>
>
>
>
>
> Why would it not work with more than two upstream PEs?
>
> Why is it limited to single forwarder selection? What about unicast based
> selection?
>
> GIM>> Again, asking for Thomas and Rob to help.
>
>
>
>    If at some later point the local PE determines that C-S is no longer
>
>    reachable through the Primary Upstream PE, the Standby Upstream PE
>
>    becomes the Upstream PE, and the local PE re-sends the C-multicast
>
>    route with RT that identifies the Standby Upstream PE, except that
>
>    now the route does not carry the Standby PE BGP Community (which
>
>    results in replacing the old route with a new route, with the only
>
>    difference between these routes being the presence/absence of the
>
>    Standby PE BGP Community).
>
>
>
> Additionally the LOCAL_PREF should also change?
>
> GIM>> Like normative SHOULD?
>
>
>
> Zzh> I meant that there should also be text talking about changing
> LOCAL_PREF.
>
GIM>> Added to the paragraph:
NEW TEXT:
Also, a LOCAL_PREF attribute MUST be set to zero.

> 5.  Hot leaf standby
>
>
>
>    The mechanisms defined in sections Section 4 and Section 3 can be
>
>    used together as follows.
>
>
>
> This section is a little confusing to me. It seems that it really should
> be how a leaf should behave when hot root standby is used, not that there
> is a =E2=80=9Chot leaf=E2=80=9D mode. A leaf is just a leaf, not a
> cold/warm/hot/primary/standby leaf.
>
> GIM>> Would re-naming the section to "Use of Standby C-multicast Route" b=
etter
> reflect the content of the section?
>
>
>
> Zzh> It seems to me that the title should really be changed to =E2=80=9CH=
ot Root
> Standby=E2=80=9D. Bob/Thomas?
>
GIM>> Agree

>
>
> Zzh> Thanks!
>
> Zzh> Jeffrey
>
>
>
> Thanks.
>
>
>
> Jeffrey
>
>
>
> *From:* BESS <bess-bounces@ietf.org> *On Behalf Of *
> stephane.litkowski@orange.com
> *Sent:* Thursday, November 22, 2018 2:54 AM
> *To:* bess@ietf.org
> *Cc:* bess-chairs@ietf.org
> *Subject:* [bess] WGLC, IPR and implementation poll for
> draft-ietf-bess-mvpn-fast-failover
>
>
>
> Hello Working Group,
>
>
>
> This email starts a two-week Working Group Last Call on
> draft-ietf-bess-mvpn-fast-failover-04  [1]
>
>
>
> This poll runs until *the 6th of December*.
>
>
>
> We are also polling for knowledge of any undisclosed IPR that applies to
> this Document, to ensure that IPR has been disclosed in compliance with
> IETF IPR rules (see RFCs 3979, 4879, 3669 and 5378 for more details).
>
> If you are listed as an Author or a Contributor of this Document please
> respond to this email and indicate whether or not you are aware of any
> relevant undisclosed IPR. The Document won't progress without answers fro=
m
> all the Authors and Contributors.
>
>
>
> Currently two IPRs have been disclosed against this Document.
>
>
>
> If you are not listed as an Author or a Contributor, then please
> explicitly respond only if you are aware of any IPR that has not yet been
> disclosed in conformance with IETF rules.
>
>
>
> We are also polling for any existing implementation as per [2].
>
>
>
>     Thank you,
>
>     Stephane & Matthew
>
>
>
>     [1]
> https://datatracker.ietf.org/doc/draft-ietf-bess-mvpn-fast-failover/
> <https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__datatracker.ietf.=
org_doc_draft-2Dietf-2Dbess-2Dmvpn-2Dfast-2Dfailover_&d=3DDwMFAg&c=3DHAkYuh=
63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=3Df7wsLGcfzAWDNS6XNTBZwj_OLAOsZZqdr=
R2IDAzeZqE&m=3D21UeMvv2ofELpScacCIlRV64tml5G3zQ3NN5NqhC90s&s=3DZKwzFkFZdTKG=
HJdgRZ6PExBQcl1Ck5CGjhXDxYQYvvI&e=3D>
>
>
>
>     [2]
> https://mailarchive.ietf.org/arch/msg/bess/cG3X1tTqb_vPC4rg56SEdkjqDpw
> <https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__mailarchive.ietf.=
org_arch_msg_bess_cG3X1tTqb-5FvPC4rg56SEdkjqDpw&d=3DDwMFAg&c=3DHAkYuh63rsuh=
r6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=3Df7wsLGcfzAWDNS6XNTBZwj_OLAOsZZqdrR2IDAz=
eZqE&m=3D21UeMvv2ofELpScacCIlRV64tml5G3zQ3NN5NqhC90s&s=3DfR1eK_EmnRha7QRf37=
WKaJmt1F5OLq7ynG7afcmPhM0&e=3D>
>
>
>
>
>
> _________________________________________________________________________=
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<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div>Hi Jeffrey,</div><d=
iv>many thanks to you and Sandy for taking the time to review the remaining=
 questions in Prague. Attached please find the updated version -06 and its =
diff to highlight the latest changes.</div><div><br></div><div>Regards,</di=
v><div>Greg</div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"g=
mail_attr">On Thu, Mar 14, 2019 at 3:04 AM Jeffrey (Zhaohui) Zhang &lt;<a h=
ref=3D"mailto:zzhang@juniper.net" target=3D"_blank">zzhang@juniper.net</a>&=
gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0=
px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">







<div lang=3D"EN-US">
<div class=3D"gmail-m_-7076389122595309638gmail-m_-3405373157246802274WordS=
ection1">
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
Thomas, Bob,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
Some questions below for you. Some old, and some new.<u></u><u></u></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
Greg,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
Sorry for the late response.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
Please see <span class=3D"gmail-m_-7076389122595309638gmail-m_-340537315724=
6802274SpellE">zzh</span>&gt; below. I trimmed some points that we agree on=
.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<div style=3D"border-top:none;border-right:none;border-bottom:none;border-l=
eft:1.5pt solid blue;padding:0in 0in 0in 4pt">
<div>
<div style=3D"border-right:none;border-bottom:none;border-left:none;border-=
top:1pt solid rgb(225,225,225);padding:3pt 0in 0in">
<p class=3D"MsoNormal"><b><span>From:</span></b><span> Greg Mirsky &lt;<a h=
ref=3D"mailto:gregimirsky@gmail.com" target=3D"_blank">gregimirsky@gmail.co=
m</a>&gt; <br>
<b>Sent:</b> Wednesday, December 5, 2018 1:38 PM<br>
<b>To:</b> Jeffrey (Zhaohui) Zhang &lt;<a href=3D"mailto:zzhang@juniper.net=
" target=3D"_blank">zzhang@juniper.net</a>&gt;<br>
<b>Cc:</b> EXT - <a href=3D"mailto:thomas.morin@orange.com" target=3D"_blan=
k">thomas.morin@orange.com</a> &lt;<a href=3D"mailto:thomas.morin@orange.co=
m" target=3D"_blank">thomas.morin@orange.com</a>&gt;; Robert Kebler &lt;<a =
href=3D"mailto:rkebler@juniper.net" target=3D"_blank">rkebler@juniper.net</=
a>&gt;; <a href=3D"mailto:bess-chairs@ietf.org" target=3D"_blank">bess-chai=
rs@ietf.org</a>; BESS &lt;<a href=3D"mailto:bess@ietf.org" target=3D"_blank=
">bess@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: [bess] WGLC, IPR and implementation poll for draft-ietf=
-bess-mvpn-fast-failover<u></u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div>
<div>
<div>
<div>
<div>
<p class=3D"MsoNormal">Hi Jeffrey,<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">thank you for the review, detailed questions=C2=A0an=
d helpful comments. Please find my notes, answers in-line tagged GIM&gt;&gt=
;.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Regards,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Greg<u></u><u></u></p>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal">On Fri, Nov 30, 2018 at 5:14 PM Jeffrey (Zhaohui) Zh=
ang &lt;<a href=3D"mailto:zzhang@juniper.net" target=3D"_blank">zzhang@juni=
per.net</a>&gt; wrote:<u></u><u></u></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
Hi,</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
I have the following questions/comments:</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 The procedure described here is an =
OPTIONAL procedure that consists</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 of having a downstream PE take into=
 account the status of P-tunnels</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 rooted at each possible upstream PE=
s, for including or not including</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 each given PE in the list of candid=
ate UMHs for a given (C-S,C-G)</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 state.=C2=A0 The result is that, if=
 a P-tunnel is &quot;down&quot; (see</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 Section 3.1), the PE that is the ro=
ot of the P-tunnel will not be</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 considered for UMH selection, which=
 will result in the downstream PE</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 to failover to the upstream PE whic=
h is next in the list of</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 candidates.</span><u></u><u></u></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
Is it possible that a p2mp tunnel is considered up by some leaves but down =
by some other leaves, leaving to them choosing different UMH? In that case,=
 procedures described in Section 9.1.1 (&quot;Discarding Packets from Wrong=
 PE&quot;) of RFC 6513 must be used. I see that this is actually pointed ou=
t later in section 6 =E2=80=93 good to have a pointer to it right here.</sp=
an><u></u><u></u></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal">GIM&gt;&gt; Would the following new text that follow=
s the quoted text address your concern:<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">NEW TEXT:=C2=A0<u></u><u></u></p>
</div>
<div>
<div>
<p class=3D"MsoNormal">=C2=A0 =C2=A0If rules to determine the state of the =
P-tunnel are not<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0 =C2=A0consistent across all PEs, then some ma=
y arrive at a different<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0 =C2=A0conclusion regarding the state of the t=
unnel, In such a scenario,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0 =C2=A0procedures described in Section 9.1.1 o=
f [RFC 6513] MUST be used</p></div></div></div></div></div></div></div></di=
v></div></div></div></div></blockquote><div>=C2=A0</div><blockquote class=
=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rg=
b(204,204,204);padding-left:1ex"><div lang=3D"EN-US"><div class=3D"gmail-m_=
-7076389122595309638gmail-m_-3405373157246802274WordSection1"><div style=3D=
"border-top:none;border-right:none;border-bottom:none;border-left:1.5pt sol=
id blue;padding:0in 0in 0in 4pt"><div><div><div><div><div><div><div><div><d=
iv><p class=3D"MsoNormal">GIM&gt;&gt; Accepted</p></div></div></div></div><=
/div></div></div></div></div></div></div></div></blockquote><div><br></div>=
<div>=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px =
0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div lan=
g=3D"EN-US"><div class=3D"gmail-m_-7076389122595309638gmail-m_-340537315724=
6802274WordSection1"><div style=3D"border-top:none;border-right:none;border=
-bottom:none;border-left:1.5pt solid blue;padding:0in 0in 0in 4pt"><div><di=
v><div><div><div><div><div><div><div>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-7076389122595309638gmail-m_-=
3405373157246802274SpellE"><span style=3D"font-size:12pt;color:rgb(31,73,12=
5)">Zzh</span></span><span style=3D"font-size:12pt;color:rgb(31,73,125)">&g=
t; It=E2=80=99s not that the =E2=80=9Crules =E2=80=A6 are not consistent=E2=
=80=9D. It=E2=80=99s that by nature some PEs may think the tunnel is down w=
hile the others may think the tunnel is still up (because they=E2=80=99re o=
n different tunnel branches), even when they follow the same rules. Traffic=
 duplication in this case is also only with inclusive tunnels =E2=80=93 so =
how about the following?<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal">=C2=A0 =C2=A0Because all PEs may arrive at a differe=
nt<u></u><u></u></p>
<p class=3D"MsoNormal">=C2=A0 =C2=A0conclusion regarding the state of the t=
unnel,<u></u><u></u></p>
<p class=3D"MsoNormal">=C2=A0 =C2=A0procedures described in Section 9.1.1 o=
f [RFC 6513] MUST be used<u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<span>=C2=A0 </span><span>=C2=A0</span></span><span style=3D"font-size:12pt=
">when using inclusive tunnels.<u></u><u></u></span></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:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
Additionally, the text in section 3 seems to be more biased on Single Forwa=
rder Election choosing the UMH with the highest IP address. Section 5 of RF=
C6513 also describes two other options, hashing or based on =E2=80=9Cinstal=
led UMH route=E2=80=9D (aka unicast-based). It is not clear how the text in=
 this document applies to hashing based selection, and I don=E2=80=99t see =
how the text applies to unicast-based selection. Some rewording/clarificati=
on are needed here.</span><u></u><u></u></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal">GIM&gt;&gt; How would the use of an alternative UMH =
selection algorithm change documented use of p2mp BFD? Do you think that if=
 the Upstream PE selected using, for example, hashing then defined use of B=
GP-BFD and p2mp BFD itself no longer applicable?<u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-7076389122595309638gmail-m_-=
3405373157246802274SpellE"><span style=3D"font-size:12pt;color:rgb(31,73,12=
5)">Zzh</span></span><span style=3D"font-size:12pt;color:rgb(31,73,125)">&g=
t; It=E2=80=99s not that the alternative UMH selection algorithm change doc=
umented use of p2mp BFD. It=E2=80=99s the other way around =E2=80=93 tunnel=
 state changes the selection result. I guess hashing can still be used (thi=
s document only controls what goes into the candidate pool). For unicast ba=
sed selection I thought it=E2=80=99d no longer work, but then I noticed the=
 following:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>o<span>=C2=A0 </span>second, the UMH candidat=
es that advertise a PMSI bound to a tunnel<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 </span>that is &quot;down&quot; --=
 these will thus be used as a last resort to<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 </span>ensure a graceful fallback =
to the basic MVPN UMH selection<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 </span>procedures in the hypotheti=
cal case where a false negative would<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 </span>occur when determining the =
status of all tunnels<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-7076389122595309638gmail-m_-=
3405373157246802274SpellE"><span style=3D"font-size:12pt;color:rgb(31,73,12=
5)">Zzh</span></span><span style=3D"font-size:12pt;color:rgb(31,73,125)">&g=
t; So this should still work, although Ideally, the PE advertising the next=
 best route should be considered before going to the last resort (of using =
the PE advertising the best route but whose tunnel is down).<u></u><u></u><=
/span></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 For P-tunnels of type P2MP MPLS-TE,=
 the status of the P-tunnel is</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 considered up if one or more of the=
 P2MP RSVP-TE LSPs, identified by</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 the P-tunnel Attribute, are in Up s=
tate. </span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
Why is =E2=80=9Cone or more of =E2=80=A6=E2=80=9D used in the above text?</=
span></p></div></div></blockquote></div></div></div></div></div></div></div=
></div></div></div></blockquote><div>GIM&gt;&gt; Clariy &quot;to the same P=
E&quot;=C2=A0</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 l=
ang=3D"EN-US"><div class=3D"gmail-m_-7076389122595309638gmail-m_-3405373157=
246802274WordSection1"><div style=3D"border-top:none;border-right:none;bord=
er-bottom:none;border-left:1.5pt solid blue;padding:0in 0in 0in 4pt"><div><=
div><div><div><div><div><div><blockquote style=3D"border-top:none;border-ri=
ght:none;border-bottom:none;border-left:1pt solid rgb(204,204,204);padding:=
0in 0in 0in 6pt;margin-left:4.8pt;margin-right:0in"><div><div><p class=3D"M=
soNormal"><u></u><u></u></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal">GIM&gt;&gt; Would s/one or more of/at least one of/ =
address your concern?=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-7076389122595309638gmail-m_-=
3405373157246802274SpellE"><span style=3D"font-size:12pt;color:rgb(31,73,12=
5)">Zzh</span></span><span style=3D"font-size:12pt;color:rgb(31,73,125)">&g=
t; Still confused. From the tunnel head, indeed it could send setup multipl=
e (sub-)LSPs, one for each leaf. From the egress point of view, there is on=
ly one LSP for an egress PE, right?<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 If tracking of the P-tunnel by usin=
g a p2mp BFD session is to be</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 enabled after the P-tunnel has been=
 already signaled, the the</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 procedure described above MUST be f=
ollowed.</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,78,121)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,78,121)">=
What if the tracking is to be enabled before the P-tunnel has been signaled=
? The text implies different behavior?</span><u></u><u></u></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal">GIM&gt;&gt; Not really, I guess. I think that the se=
cond sentence is important:<u></u><u></u></p>
</div>
<div>
<div>
<p class=3D"MsoNormal">=C2=A0 =C2=A0Note that x-PMSI A-D Route MUST be re-s=
ent with exactly the same attributes as before and<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0 =C2=A0the BGP-BFD Attribute included.<u></u><=
u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-7076389122595309638gmail-m_-=
3405373157246802274SpellE"><span style=3D"font-size:12pt;color:rgb(31,73,12=
5)">Zzh</span></span><span style=3D"font-size:12pt;color:rgb(31,73,125)">&g=
t; In that case, how about changing the paragraph and the next one to the f=
ollowing:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>If tracking of the P-tunnel by using a p2mp B=
FD session is<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:4.8pt">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0 </span>enabled after the x-PMSI A-D route has been already=
 advertised,<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>the x-PMSI A-D<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>Route MUST be re-sent with exactly the same a=
ttributes as before and<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>the BGP-BFD Attribute included.<u></u><u></u>=
</span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>If the x-PMSI A-D route is advertised with P-=
tunnel status tracked using<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>the p2mp BFD session and it is desired to sto=
p tracking P-tunnel<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>status using BFD, then:<u></u><u></u></span><=
/p>
<p class=3D"MsoNormal"><br></p></div></div></div></div></div></div></div></=
div></div></div></div></div></blockquote><div>GIM&gt;&gt; Agree</div><div>=
=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0=
.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang=3D"=
EN-US"><div class=3D"gmail-m_-7076389122595309638gmail-m_-34053731572468022=
74WordSection1"><div style=3D"border-top:none;border-right:none;border-bott=
om:none;border-left:1.5pt solid blue;padding:0in 0in 0in 4pt"><div><div><di=
v><div><div><div><div><div><div><p class=3D"MsoNormal"></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-7076389122595309638gmail-m_-=
3405373157246802274SpellE"><span style=3D"font-size:12pt;color:rgb(31,73,12=
5)">zzh</span></span><span style=3D"font-size:12pt;color:rgb(31,73,125)">&g=
t; BTW, the same applies to 3.1.7 as well.</span></p></div></div></div></di=
v></div></div></div></div></div></div></div></div></blockquote><div>GIM&gt;=
&gt; Agree=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 lang=3D"EN-US"><div class=3D"gmail-m_-7076389122595309638gmail-m_-3405373=
157246802274WordSection1"><div style=3D"border-top:none;border-right:none;b=
order-bottom:none;border-left:1.5pt solid blue;padding:0in 0in 0in 4pt"><di=
v><div><div><div><div><div><div><div><div><p class=3D"MsoNormal"><span styl=
e=3D"font-size:12pt;color:rgb(31,73,125)"><u></u><u></u></span></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:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 When such a procedure is used, in t=
he context where fast restoration</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 mechanisms are used for the P-tunne=
ls, leaf PEs should be configured</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 to wait before updating the UMH, to=
 let the P-tunnel restoration</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 mechanism happen.=C2=A0 A configura=
ble timer MUST be provided for this</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 purpose, and it is recommended to p=
rovide a reasonable default value</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 for this timer.</span><u></u><u></u=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
What does =E2=80=9Csuch a procedure=E2=80=9D refers to?</span><u></u><u></u=
></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal">GIM&gt;&gt; Would s/When such a procedure is used/In=
 such a scenario/<u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-7076389122595309638gmail-m_-=
3405373157246802274SpellE"><span style=3D"font-size:12pt;color:rgb(31,73,12=
5)">Zzh</span></span><span style=3D"font-size:12pt;color:rgb(31,73,125)">&g=
t; I looked at the surrounding (new) text:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>If the Downstream PE&#39;s P-tunnel is alread=
y up, its state being<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>monitored by the p2mp BFD session, and the Do=
wnstream PE receives the<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>new x-PMSI A-D Route without the BGP-BFD Attr=
ibute, the Downstream<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>PE:<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>o<span>=C2=A0 </span>MUST accept the x-PMSI A=
-D Route;<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>o<span>=C2=A0 </span></span><span style=3D"fo=
nt-size:10pt;font-family:&quot;Courier New&quot;;color:red">MUST stop recei=
ving BFD control packets for this p2mp BFD session;<u></u><u></u></span></p=
>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>o<span>=C2=A0 </span>SHOULD delete the p2mp B=
FD session associated with the P-tunnel;<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>o<span>=C2=A0 </span>SHOULD NOT switch the tr=
affic to the Standby Upstream PE.<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>In such a scenario, in the context where fast=
 restoration mechanisms<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>are used for the P-tunnels, leaf PEs should b=
e configured to wait<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>before updating the UMH, </span><span style=
=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:red">to let th=
e P-tunnel restoration mechanism<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:red=
"><span>=C2=A0=C2=A0 </span>happen.<span>=C2=A0</span></span></p></div></di=
v></div></div></div></div></div></div></div></div></div></blockquote><div>G=
IM&gt;&gt; Remove the last paragraph?=C2=A0</div><blockquote class=3D"gmail=
_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204=
,204);padding-left:1ex"><div lang=3D"EN-US"><div class=3D"gmail-m_-70763891=
22595309638gmail-m_-3405373157246802274WordSection1"><div style=3D"border-t=
op:none;border-right:none;border-bottom:none;border-left:1.5pt solid blue;p=
adding:0in 0in 0in 4pt"><div><div><div><div><div><div><div><div><p class=3D=
"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Courier New&quo=
t;;color:red"><span> </span><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-7076389122595309638gmail-m_-=
3405373157246802274SpellE"><span style=3D"font-size:12pt;color:rgb(31,73,12=
5)">Zzh</span></span><span style=3D"font-size:12pt;color:rgb(31,73,125)">&g=
t; Now I have the following two questions:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-7076389122595309638gmail-m_-=
3405373157246802274SpellE"><span style=3D"font-size:12pt;color:rgb(31,73,12=
5)">Zzh</span></span><span style=3D"font-size:12pt;color:rgb(31,73,125)">&g=
t; a) Should the =E2=80=9C</span><span style=3D"font-size:10pt;font-family:=
&quot;Courier New&quot;;color:black">MUST stop receiving BFD control packet=
s for this p2mp BFD session=E2=80=9D</span><span style=3D"font-size:12pt;co=
lor:rgb(32,56,100)"> be removed? How would you =E2=80=9Cstop receiving BFD =
control packets=E2=80=9D? Isn=E2=80=99t it implied by the next bullet point=
 already?<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-7076389122595309638gmail-m_-=
3405373157246802274SpellE"><span style=3D"font-size:12pt;color:rgb(32,56,10=
0)">Zzh</span></span><span style=3D"font-size:12pt;color:rgb(32,56,100)">&g=
t; b) What does the last clause =E2=80=9Cto let the P-tunnel restoration me=
chanism happen=E2=80=9D mean? The scenario is that an x-PMSI route update i=
s received w/o the BGP-BFD attribute =E2=80=93 where does the tunnel restor=
ation come from?</span><span style=3D"font-size:12pt;color:rgb(32,56,100)">=
<u></u><u></u></span></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">3.1.7.=C2=A0 Per PE-CE link BFD Discriminator</s=
pan><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 The following approach is defined f=
or the fast failover in response</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 to the detection of PE-CE link fail=
ures, in which UMH selection for a</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 given C-multicast route takes into =
account the state of the BFD</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 session associated with the state o=
f the upstream PE-CE link.</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">3.1.7.1.=C2=A0 Upstream PE Procedures</span><u><=
/u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 For each protected PE-CE link, the =
upstream PE initiates a multipoint</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 BFD session [I-D.ietf-bfd-multipoin=
t] as MultipointHead toward</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 downstream PEs.=C2=A0 A downstream =
PE monitors the state of the p2mp</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 session as MultipointTail and MAY i=
nterpret transition of the BFD</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 session into Down state as the indi=
cation of the associated PE-CE</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 link being down.</span><u></u><u></=
u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,78,121)">=
Since the BFD packets are sent over the P2MP tunnel not the PE-CE link, my =
understanding is that the BFD discriminator is still for the tunnel and not=
 tied to the PE-CE link; but different from the previous case, the root wil=
l stop sending BFD messages when it detects the PE-CE link failure. As far =
as the egress PEs are concerned, they don=E2=80=99t know if it is the tunne=
l failure or PE-CE link failure.</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,78,121)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,78,121)">=
If my understanding is correct, the wording should be changed.</span><u></u=
><u></u></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal">GIM&gt;&gt; There are other than stopping transmissi=
on of BFD control packets ways to distinguish two conditions for the egress=
 PE. For example, the MultipointHead MAY set the State to AdminDown and con=
tinue sending BFD control packets. If and when PE-CE link restored to Up, t=
he MultipointHead can set the state to Up in the BFD control packet.<u></u>=
<u></u></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,78,121)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 =E2=80=A6=C2=A0 If the route to the=
</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 src/RP changes such that the RPF in=
terface is changed to be a new PE-</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 CE interface, then the upstream PE =
will update the S-PMSI A-D route</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 with included BGP-BFD Attribute so =
that value of the BFD</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 Discriminator is associated with th=
e new RPF link.</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
If the RPF interface changes on the upstream PE, why should it update the r=
oute to send a new discriminator? As long as there is a new RPF interface c=
ouldn=E2=80=99t the upstream PE do nothing but start tracking the new RPF i=
nterface?</span><u></u><u></u></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal">GIM&gt;&gt; I&#39;ll defer this one to Thomas and Ro=
b.<u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-7076389122595309638gmail-m_-=
3405373157246802274SpellE"><span style=3D"font-size:12pt;color:rgb(31,73,12=
5)">Zzh</span></span><span style=3D"font-size:12pt;color:rgb(31,73,125)">&g=
t; I re-read section 3.1.6 and 3.1.7 and have more questions </span><span s=
tyle=3D"font-size:12pt;font-family:&quot;Segoe UI Emoji&quot;,sans-serif;co=
lor:rgb(31,73,125)">=F0=9F=98=8A</span><span style=3D"font-size:12pt;color:=
rgb(31,73,125)"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-7076389122595309638gmail-m_-=
3405373157246802274SpellE"><span style=3D"font-size:12pt;color:rgb(31,73,12=
5)">Zzh</span></span><span style=3D"font-size:12pt;color:rgb(31,73,125)">&g=
t; 3.1.6 seems to be about tracking tunnel itself while 3.1.7 is about trac=
king PE-CE interfaces. From an egress point of view, (how) does it know if =
the discriminator is for the tunnel or for PE-CE interface 1 or PE-CE inter=
face 2? Does it even care? It seems to me that an egress PE would not need =
to care. If so, why are there different procedures for 3.1.6/3.1.7 (at leas=
t for the egress PE behavior)? Even for the upstream PE behavior, shouldn=
=E2=80=99t 3.1.6.1 apply to 3.1.7 as well?</span></p></div></div></div></di=
v></div></div></div></div></div></div></div></blockquote><div>GIM&gt;&gt; A=
dded the following text to the first paragraph of section 3.1.7:</div><div>=
NEW TEXT:</div><div><div>The mechanism to communicate the mapping between t=
he PE-CE link</div><div>and the associated BFD session is outside the scope=
 of this document.</div></div><blockquote class=3D"gmail_quote" style=3D"ma=
rgin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:=
1ex"><div lang=3D"EN-US"><div class=3D"gmail-m_-7076389122595309638gmail-m_=
-3405373157246802274WordSection1"><div style=3D"border-top:none;border-righ=
t:none;border-bottom:none;border-left:1.5pt solid blue;padding:0in 0in 0in =
4pt"><div><div><div><div><div><div><div><div><p class=3D"MsoNormal"><span s=
tyle=3D"font-size:12pt;color:rgb(31,73,125)"><u></u><u></u></span></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
Regardless which way (the currently described way and my imagined way), som=
e text should be added to discuss how the downstream would not switch to an=
other upstream PE when the primary PE is just going through a RPF change.</=
span><u></u><u></u></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal">GIM&gt;&gt;=C2=A0 Would appending the following text=
 be acceptable to address your concern:<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">NEW TEXT:<u></u><u></u></p>
</div>
<div>
<div>
<p class=3D"MsoNormal">=C2=A0 =C2=A0To avoid unwarranted switchover a downs=
tream PE MUST gracefully handle the<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0 =C2=A0updated S-PMSI A-D route and switch to =
the use of the associated BFD<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0 =C2=A0Discriminator value.<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:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">4.=C2=A0 Standby C-multicast route</span><u></u>=
<u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 The procedures described below are =
limited to the case where the site</span><u></u><u></u></p>
<pre><span style=3D"color:black">=C2=A0=C2=A0 that contains C-S is connecte=
d to exactly two PEs. The procedures</span><u></u><u></u></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 require all the PEs of that MVPN to=
 follow the single forwarder PE</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 selection, as specified in [RFC6513=
].=C2=A0 </span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
Why would it not work with more than two upstream PEs?</span><u></u><u></u>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
Why is it limited to single forwarder selection? What about unicast based s=
election?</span><u></u><u></u></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal">GIM&gt;&gt; Again, asking for Thomas and Rob to help=
.=C2=A0<u></u><u></u></p>
</div>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 If at some later point the local PE=
 determines that C-S is no longer</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 reachable through the Primary Upstr=
eam PE, the Standby Upstream PE</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 becomes the Upstream PE, and the lo=
cal PE re-sends the C-multicast</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 route with RT that identifies the S=
tandby Upstream PE, except that</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 now the route does not carry the St=
andby PE BGP Community (which</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 results in replacing the old route =
with a new route, with the only</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 difference between these routes bei=
ng the presence/absence of the</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 Standby PE BGP Community).</span><u=
></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
Additionally the LOCAL_PREF should also change?</span><u></u><u></u></p>
</div>
</div>
</div>
<div>
<p class=3D"MsoNormal">GIM&gt;&gt; Like normative SHOULD?=C2=A0<u></u><u></=
u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-7076389122595309638gmail-m_-=
3405373157246802274SpellE"><span style=3D"font-size:12pt;color:rgb(31,73,12=
5)">Zzh</span></span><span style=3D"font-size:12pt;color:rgb(31,73,125)">&g=
t; I meant that there should also be text talking about changing LOCAL_PREF=
.</span></p></div></div></div></div></div></div></div></div></blockquote><d=
iv>GIM&gt;&gt; Added to the paragraph:</div><div>NEW TEXT:</div><div>Also, =
a LOCAL_PREF attribute MUST be set to zero.<br></div><blockquote class=3D"g=
mail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204=
,204,204);padding-left:1ex"><div lang=3D"EN-US"><div class=3D"gmail-m_-7076=
389122595309638gmail-m_-3405373157246802274WordSection1"><div style=3D"bord=
er-top:none;border-right:none;border-bottom:none;border-left:1.5pt solid bl=
ue;padding:0in 0in 0in 4pt"><div><div><div><div><div><p class=3D"MsoNormal"=
><span style=3D"font-size:12pt;color:rgb(31,73,125)"><u></u><u></u></span><=
/p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">5.=C2=A0 Hot leaf standby</span><u></u><u></u></=
p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 The mechanisms defined in sections =
Section 4 and Section 3 can be</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 used together as follows.</span><u>=
</u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
This section is a little confusing to me. It seems that it really should be=
 how a leaf should behave when hot root standby is used, not that there is =
a =E2=80=9Chot leaf=E2=80=9D mode. A leaf is just a leaf, not a cold/warm/h=
ot/primary/standby leaf.</span><u></u><u></u></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal">GIM&gt;&gt; Would re-naming the section to &quot;Use=
 of=C2=A0<span style=3D"font-size:10pt;color:black">Standby C-multicast Rou=
te&quot;</span>=C2=A0better reflect the content of the section?<u></u><u></=
u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-7076389122595309638gmail-m_-=
3405373157246802274SpellE"><span style=3D"font-size:12pt;color:rgb(31,73,12=
5)">Zzh</span></span><span style=3D"font-size:12pt;color:rgb(31,73,125)">&g=
t; It seems to me that the title should really be changed to =E2=80=9CHot R=
oot Standby=E2=80=9D. Bob/Thomas?</span></p></div></div></div></div></div><=
/div></div></div></blockquote><div>GIM&gt;&gt; Agree=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 lang=3D"EN-US"><div class=3D"gm=
ail-m_-7076389122595309638gmail-m_-3405373157246802274WordSection1"><div st=
yle=3D"border-top:none;border-right:none;border-bottom:none;border-left:1.5=
pt solid blue;padding:0in 0in 0in 4pt"><div><div><div><div><div><p class=3D=
"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)"><u></u><u><=
/u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-7076389122595309638gmail-m_-=
3405373157246802274SpellE"><span style=3D"font-size:12pt;color:rgb(31,73,12=
5)">Zzh</span></span><span style=3D"font-size:12pt;color:rgb(31,73,125)">&g=
t; Thanks!<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-7076389122595309638gmail-m_-=
3405373157246802274SpellE"><span style=3D"font-size:12pt;color:rgb(31,73,12=
5)">Zzh</span></span><span style=3D"font-size:12pt;color:rgb(31,73,125)">&g=
t; Jeffrey<u></u><u></u></span></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
Thanks.</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
Jeffrey</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<div style=3D"border-top:none;border-right:none;border-bottom:none;border-l=
eft:1.5pt solid blue;padding:0in 0in 0in 4pt">
<div>
<div style=3D"border-right:none;border-bottom:none;border-left:none;border-=
top:1pt solid rgb(225,225,225);padding:3pt 0in 0in">
<p class=3D"MsoNormal">
<b>From:</b> BESS &lt;<a href=3D"mailto:bess-bounces@ietf.org" target=3D"_b=
lank">bess-bounces@ietf.org</a>&gt; <b>On Behalf Of </b><a href=3D"mailto:s=
tephane.litkowski@orange.com" target=3D"_blank">stephane.litkowski@orange.c=
om</a><br>
<b>Sent:</b> Thursday, November 22, 2018 2:54 AM<br>
<b>To:</b> <a href=3D"mailto:bess@ietf.org" target=3D"_blank">bess@ietf.org=
</a><br>
<b>Cc:</b> <a href=3D"mailto:bess-chairs@ietf.org" target=3D"_blank">bess-c=
hairs@ietf.org</a><br>
<b>Subject:</b> [bess] WGLC, IPR and implementation poll for draft-ietf-bes=
s-mvpn-fast-failover<u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p class=3D"gmail-m_-7076389122595309638gmail-m_-3405373157246802274gmail-m=
-3308390041763979650gmail-m-8796632855555630134msoplaintext">Hello Working =
Group,<u></u><u></u></p>
<p class=3D"gmail-m_-7076389122595309638gmail-m_-3405373157246802274gmail-m=
-3308390041763979650gmail-m-8796632855555630134msoplaintext">=C2=A0=C2=A0=
=C2=A0 <u></u><u></u></p>
<p class=3D"gmail-m_-7076389122595309638gmail-m_-3405373157246802274gmail-m=
-3308390041763979650gmail-m-8796632855555630134msoplaintext">This email sta=
rts a two-week Working Group Last Call on draft-ietf-bess-mvpn-fast-failove=
r-04 =C2=A0[1]<u></u><u></u></p>
<p class=3D"gmail-m_-7076389122595309638gmail-m_-3405373157246802274gmail-m=
-3308390041763979650gmail-m-8796632855555630134msoplaintext">=C2=A0<u></u><=
u></u></p>
<p class=3D"gmail-m_-7076389122595309638gmail-m_-3405373157246802274gmail-m=
-3308390041763979650gmail-m-8796632855555630134msoplaintext">This poll runs=
 until *the 6th of December*.<u></u><u></u></p>
<p class=3D"gmail-m_-7076389122595309638gmail-m_-3405373157246802274gmail-m=
-3308390041763979650gmail-m-8796632855555630134msoplaintext">=C2=A0<u></u><=
u></u></p>
<p class=3D"gmail-m_-7076389122595309638gmail-m_-3405373157246802274gmail-m=
-3308390041763979650gmail-m-8796632855555630134msoplaintext">We are also po=
lling for knowledge of any undisclosed IPR that applies to this Document, t=
o ensure that IPR has been disclosed in compliance with IETF IPR rules (see=
 RFCs 3979, 4879, 3669 and 5378 for more details).<u></u><u></u></p>
<p class=3D"gmail-m_-7076389122595309638gmail-m_-3405373157246802274gmail-m=
-3308390041763979650gmail-m-8796632855555630134msoplaintext">If you are lis=
ted as an Author or a Contributor of this Document please respond to this e=
mail and indicate whether or not you are aware of any relevant undisclosed =
IPR. The Document won&#39;t progress without answers from all the Authors a=
nd Contributors.<u></u><u></u></p>
<p class=3D"gmail-m_-7076389122595309638gmail-m_-3405373157246802274gmail-m=
-3308390041763979650gmail-m-8796632855555630134msoplaintext">=C2=A0<u></u><=
u></u></p>
<p class=3D"gmail-m_-7076389122595309638gmail-m_-3405373157246802274gmail-m=
-3308390041763979650gmail-m-8796632855555630134msoplaintext">Currently two =
IPRs have been disclosed against this Document.<u></u><u></u></p>
<p class=3D"gmail-m_-7076389122595309638gmail-m_-3405373157246802274gmail-m=
-3308390041763979650gmail-m-8796632855555630134msoplaintext">=C2=A0<u></u><=
u></u></p>
<p class=3D"gmail-m_-7076389122595309638gmail-m_-3405373157246802274gmail-m=
-3308390041763979650gmail-m-8796632855555630134msoplaintext">If you are not=
 listed as an Author or a Contributor, then please explicitly respond only =
if you are aware of any IPR that has not yet been disclosed in conformance =
with IETF rules.<u></u><u></u></p>
<p class=3D"gmail-m_-7076389122595309638gmail-m_-3405373157246802274gmail-m=
-3308390041763979650gmail-m-8796632855555630134msoplaintext">=C2=A0<u></u><=
u></u></p>
<p class=3D"gmail-m_-7076389122595309638gmail-m_-3405373157246802274gmail-m=
-3308390041763979650gmail-m-8796632855555630134msoplaintext">We are also po=
lling for any existing implementation as per [2].<u></u><u></u></p>
<p class=3D"gmail-m_-7076389122595309638gmail-m_-3405373157246802274gmail-m=
-3308390041763979650gmail-m-8796632855555630134msoplaintext">=C2=A0=C2=A0=
=C2=A0 <u></u><u></u></p>
<p class=3D"gmail-m_-7076389122595309638gmail-m_-3405373157246802274gmail-m=
-3308390041763979650gmail-m-8796632855555630134msoplaintext">=C2=A0=C2=A0=
=C2=A0=C2=A0Thank you,<u></u><u></u></p>
<p class=3D"gmail-m_-7076389122595309638gmail-m_-3405373157246802274gmail-m=
-3308390041763979650gmail-m-8796632855555630134msoplaintext">=C2=A0=C2=A0=
=C2=A0 Stephane &amp; Matthew<u></u><u></u></p>
<p class=3D"gmail-m_-7076389122595309638gmail-m_-3405373157246802274gmail-m=
-3308390041763979650gmail-m-8796632855555630134msoplaintext">=C2=A0<u></u><=
u></u></p>
<p class=3D"gmail-m_-7076389122595309638gmail-m_-3405373157246802274gmail-m=
-3308390041763979650gmail-m-8796632855555630134msoplaintext">=C2=A0=C2=A0=
=C2=A0=C2=A0[1] <a href=3D"https://urldefense.proofpoint.com/v2/url?u=3Dhtt=
ps-3A__datatracker.ietf.org_doc_draft-2Dietf-2Dbess-2Dmvpn-2Dfast-2Dfailove=
r_&amp;d=3DDwMFAg&amp;c=3DHAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&amp;r=
=3Df7wsLGcfzAWDNS6XNTBZwj_OLAOsZZqdrR2IDAzeZqE&amp;m=3D21UeMvv2ofELpScacCIl=
RV64tml5G3zQ3NN5NqhC90s&amp;s=3DZKwzFkFZdTKGHJdgRZ6PExBQcl1Ck5CGjhXDxYQYvvI=
&amp;e=3D" target=3D"_blank"> https://datatracker.ietf.org/doc/draft-ietf-b=
ess-mvpn-fast-failover/</a><u></u><u></u></p>
<p class=3D"gmail-m_-7076389122595309638gmail-m_-3405373157246802274gmail-m=
-3308390041763979650gmail-m-8796632855555630134msoplaintext">=C2=A0<u></u><=
u></u></p>
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-3308390041763979650gmail-m-8796632855555630134msoplaintext">=C2=A0=C2=A0=
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</blockquote></div></div></div></div>

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From: Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com>
To: "bess@ietf.org" <bess@ietf.org>
CC: P Muthu Arul Mozhi <p.muthu.arul.mozhi@ericsson.com>
Thread-Topic: DF election rule in EVPN MH, for untagged interface - reg
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Subject: [bess] DF election rule in EVPN MH, for untagged interface - reg
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Hi All,

RFC7432, section 8.5, talks about DF election algorithm (service carving al=
gorithm)

only for <ES, VLAN> for VLAN-based service or <ES, VLAN bundle> for VLAN-(a=
ware)
bundle service.

But there wont be any vlan id for untagged interface and so I wonder
how the service carving algorithm can be applied to elect the DF.
Also, should I use the lower VLAN ID even in the case of VLAN-bundle
service, for electing the DF?

Could some one help me to understand this please?

=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<snip from RFC 7432, section 8.5>=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
8.5<https://tools.ietf.org/html/rfc7432#section-8.5>.  Designated Forwarder=
 Election

...

   The default procedure for DF election at the granularity of <ES,

   VLAN> for VLAN-based service or <ES, VLAN bundle> for VLAN-(aware)

   bundle service is referred to as "service carving".
...

      Assuming a redundancy group of N PE nodes, for VLAN-based service,

      the PE with ordinal i is the DF for an <ES, VLAN V> when (V mod N)

      =3D i.  In the case of VLAN-(aware) bundle service, then the

      numerically lowest VLAN value in that bundle on that ES MUST be

      used in the modulo function.
...
=3D=3D=3D=3D=3D=3D=3D=3D=3D<snip end>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D

Thanks & Regards
Jaikumar S


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<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:Consolas=
">Hi All,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:Consolas=
"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:Consolas=
">RFC7432, section 8.5, talks about DF election algorithm (service carving =
algorithm)<o:p></o:p></span></p>
<pre><span style=3D"font-family:Consolas">only for </span><span style=3D"co=
lor:black">&lt;ES, VLAN&gt; for VLAN-based service or &lt;ES, VLAN bundle&g=
t; for VLAN-(aware)<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black">bundle service</span><span style=3D"font-size:=
10.0pt;font-family:Consolas">.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:Consolas=
"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:Consolas=
">But there wont be any vlan id for untagged interface and so I wonder<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:Consolas=
">how the service carving algorithm can be applied to elect the DF.<o:p></o=
:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:Consolas=
">Also, should I use the lower VLAN ID even in the case of VLAN-bundle<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:Consolas=
">service, for electing the DF?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:Consolas=
"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:Consolas=
">Could some one help me to understand this please?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:Consolas=
"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:Consolas=
">=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D&lt;snip from RFC 7432, section 8.5&gt;=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<o:p></o:p></span></p>
<h3 style=3D"mso-line-height-alt:0pt"><a name=3D"section-8.5"></a><a href=
=3D"https://tools.ietf.org/html/rfc7432#section-8.5"><span style=3D"mso-boo=
kmark:&quot;section-8\.5&quot;"><span style=3D"font-size:10.0pt;font-family=
:&quot;Courier New&quot;;color:black">8.5</span></span><span style=3D"mso-b=
ookmark:&quot;section-8\.5&quot;"></span></a><span style=3D"mso-bookmark:&q=
uot;section-8\.5&quot;"></span><span style=3D"font-size:10.0pt;font-family:=
&quot;Courier New&quot;;color:black">.&nbsp;
 Designated Forwarder Election<o:p></o:p></span></h3>
<pre><span style=3D"color:black">&#8230;<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; The default procedure for DF =
election at the granularity of &lt;ES,<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; VLAN&gt; for VLAN-based servi=
ce or &lt;ES, VLAN bundle&gt; for VLAN-(aware)<o:p></o:p></span></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp; bundle service is referred to=
 as &quot;service carving&quot;. <o:p></o:p></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:Consolas=
">&#8230;<o:p></o:p></span></p>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; Assuming a =
redundancy group of N PE nodes, for VLAN-based service,<o:p></o:p></span></=
pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; the PE with=
 ordinal i is the DF for an &lt;ES, VLAN V&gt; when (V mod N)<o:p></o:p></s=
pan></pre>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; =3D i.&nbsp=
; In the case of VLAN-(aware) bundle service, then the<o:p></o:p></span></p=
re>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; numerically=
 lowest VLAN value in that bundle on that ES MUST be<o:p></o:p></span></pre=
>
<pre><span style=3D"color:black">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; used in the=
 modulo function.<o:p></o:p></span></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:Consolas=
">&#8230;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:Consolas=
">=3D=3D=3D=3D=3D=3D=3D=3D=3D&lt;snip end&gt;=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:Consolas=
"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ve=
rdana&quot;,sans-serif">Thanks &amp; Regards<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ve=
rdana&quot;,sans-serif">Jaikumar S<o:p></o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
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From: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>
To: Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com>, "bess@ietf.org" <bess@ietf.org>
CC: P Muthu Arul Mozhi <p.muthu.arul.mozhi@ericsson.com>
Thread-Topic: [bess] DF election rule in EVPN MH, for untagged interface - reg
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Date: Fri, 5 Apr 2019 05:41:23 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/Df8N7-k5pg_QtxoljVT61uXmsgk>
Subject: Re: [bess] DF election rule in EVPN MH, for untagged interface - reg
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From: Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com>
To: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>, "bess@ietf.org" <bess@ietf.org>
CC: P Muthu Arul Mozhi <p.muthu.arul.mozhi@ericsson.com>
Thread-Topic: [bess] DF election rule in EVPN MH, for untagged interface - reg
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Date: Fri, 5 Apr 2019 09:40:54 +0000
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Subject: Re: [bess] DF election rule in EVPN MH, for untagged interface - reg
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From: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
Date: Fri, 5 Apr 2019 20:40:37 +0530
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To: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>
Cc: Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com>, "bess@ietf.org" <bess@ietf.org>,  P Muthu Arul Mozhi <p.muthu.arul.mozhi@ericsson.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/7MGP6ccB-CEue7PhvvO8VAZ2DLA>
Subject: Re: [bess] DF election rule in EVPN MH, for untagged interface - reg
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Thanks, Jorge. It is clear that the Ethernet Tag needs to be different from
0 for the purpose of DF election..

One of the options a provider has for supporting untagged frames in EVPN
VPLS multihoming in VID translation...a rule to match untagged frames and
impose a VID at the ingress and another rule to match that VID and dispose
it at the egress.

Are there any other options that can interop well?

Regards,
Muthu

On Fri, Apr 5, 2019 at 11:11 AM Rabadan, Jorge (Nokia - US/Mountain View) <
jorge.rabadan@nokia.com> wrote:

> Hi,
>
>
>
> I think you should check out
> https://tools.ietf.org/html/draft-ietf-bess-evpn-df-election-framework-09
>
>
>
> This draft updates RFC7432 in certain aspects of the DF Election, and it
> is already at the RFC editor.
>
>
>
> Check out the use of Ethernet Tag in the document.
>
>
>
>    o Ethernet Tag - used to represent a Broadcast Domain that is
>
>      configured on a given ES for the purpose of DF election. Note that
>
>      any of the following may be used to represent a Broadcast Domain:
>
>      VIDs (including Q-in-Q tags), configured IDs, VNI (VXLAN Network
>
>      Identifiers), normalized VID, I-SIDs (Service Instance
>
>      Identifiers), etc., as long as the representation of the broadcast
>
>      domains is configured consistently across the multi-homed PEs
>
>      attached to that ES. The Ethernet Tag value MUST be different from
>
>      zero.
>
>
>
> Thanks.
>
> Jorge
>
>
>
> *From: *BESS <bess-bounces@ietf.org> on behalf of Jaikumar Somasundaram <
> jaikumar.somasundaram@ericsson.com>
> *Date: *Friday, April 5, 2019 at 6:15 AM
> *To: *"bess@ietf.org" <bess@ietf.org>
> *Cc: *P Muthu Arul Mozhi <p.muthu.arul.mozhi@ericsson.com>
> *Subject: *[bess] DF election rule in EVPN MH, for untagged interface -
> reg
>
>
>
> Hi All,
>
>
>
> RFC7432, section 8.5, talks about DF election algorithm (service carving
> algorithm)
>
> only for <ES, VLAN> for VLAN-based service or <ES, VLAN bundle> for VLAN-=
(aware)
>
> bundle service.
>
>
>
> But there wont be any vlan id for untagged interface and so I wonder
>
> how the service carving algorithm can be applied to elect the DF.
>
> Also, should I use the lower VLAN ID even in the case of VLAN-bundle
>
> service, for electing the DF?
>
>
>
> Could some one help me to understand this please?
>
>
>
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<snip from RFC 7432, section 8.5>=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> 8.5 <https://tools.ietf.org/html/rfc7432#section-8.5>.  Designated
> Forwarder Election
>
> =E2=80=A6
>
>    The default procedure for DF election at the granularity of <ES,
>
>    VLAN> for VLAN-based service or <ES, VLAN bundle> for VLAN-(aware)
>
>    bundle service is referred to as "service carving".
>
> =E2=80=A6
>
>       Assuming a redundancy group of N PE nodes, for VLAN-based service,
>
>       the PE with ordinal i is the DF for an <ES, VLAN V> when (V mod N)
>
>       =3D i.  In the case of VLAN-(aware) bundle service, then the
>
>       numerically lowest VLAN value in that bundle on that ES MUST be
>
>       used in the modulo function.
>
> =E2=80=A6
>
> =3D=3D=3D=3D=3D=3D=3D=3D=3D<snip end>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D
>
>
>
> Thanks & Regards
>
> Jaikumar S
>
>
> _______________________________________________
> BESS mailing list
> BESS@ietf.org
> https://www.ietf.org/mailman/listinfo/bess
>

--000000000000745e720585c9e435
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr"><div class=3D"gmail_default" style=3D"fon=
t-family:arial,helvetica,sans-serif;font-size:small">Thanks, Jorge. It is c=
lear that the Ethernet Tag needs to be different from 0 for the purpose of =
DF election..=C2=A0</div><div class=3D"gmail_default" style=3D"font-family:=
arial,helvetica,sans-serif;font-size:small"><br></div><div class=3D"gmail_d=
efault" style=3D"font-family:arial,helvetica,sans-serif;font-size:small">On=
e of the options a provider has for supporting untagged frames in EVPN VPLS=
 multihoming in VID translation...a rule to match untagged frames and impos=
e a VID at the ingress and another rule to match that VID and dispose it at=
 the egress.</div><div class=3D"gmail_default" style=3D"font-family:arial,h=
elvetica,sans-serif;font-size:small"><br></div><div class=3D"gmail_default"=
 style=3D"font-family:arial,helvetica,sans-serif;font-size:small">Are there=
 any other options that can interop well?</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-ser=
if;font-size:small">Regards,</div><div class=3D"gmail_default" style=3D"fon=
t-family:arial,helvetica,sans-serif;font-size:small">Muthu</div></div><br><=
div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, Apr=
 5, 2019 at 11:11 AM Rabadan, Jorge (Nokia - US/Mountain View) &lt;<a href=
=3D"mailto:jorge.rabadan@nokia.com">jorge.rabadan@nokia.com</a>&gt; wrote:<=
br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8e=
x;border-left:1px solid rgb(204,204,204);padding-left:1ex">





<div lang=3D"EN-US">
<div class=3D"gmail-m_5949779205721859240WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">Hi,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">I think you should check out
<a href=3D"https://tools.ietf.org/html/draft-ietf-bess-evpn-df-election-fra=
mework-09" target=3D"_blank">
https://tools.ietf.org/html/draft-ietf-bess-evpn-df-election-framework-09</=
a> <u></u>
<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">This draft updates RFC7432 in certain aspects of the DF Election, and it =
is already at the RFC editor.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">Check out the use of Ethernet Tag in the document.<u></u><u></u></span></=
p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 o Ethernet Tag - used to represent =
a Broadcast Domain that is<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0=C2=A0=C2=A0 configured on a given E=
S for the purpose of DF election. Note that<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0=C2=A0=C2=A0 any of the following ma=
y be used to represent a Broadcast Domain:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0=C2=A0=C2=A0 VIDs (including Q-in-Q =
tags), configured IDs, VNI (VXLAN Network<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0=C2=A0=C2=A0 Identifiers), normalize=
d VID, I-SIDs (Service Instance<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0=C2=A0=C2=A0 Identifiers), etc., as =
long as the representation of the broadcast<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0=C2=A0=C2=A0 domains is configured c=
onsistently across the multi-homed PEs<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0=C2=A0=C2=A0 attached to that ES. Th=
e Ethernet Tag value MUST be different from<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0=C2=A0=C2=A0 zero.<u></u><u></u></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">Thanks.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">Jorge<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
"><u></u>=C2=A0<u></u></span></p>
<div style=3D"border-right:none;border-bottom:none;border-left:none;border-=
top:1pt solid rgb(181,196,223);padding:3pt 0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><b><span style=3D"font-si=
ze:12pt;color:black">From:
</span></b><span style=3D"font-size:12pt;color:black">BESS &lt;<a href=3D"m=
ailto:bess-bounces@ietf.org" target=3D"_blank">bess-bounces@ietf.org</a>&gt=
; on behalf of Jaikumar Somasundaram &lt;<a href=3D"mailto:jaikumar.somasun=
daram@ericsson.com" target=3D"_blank">jaikumar.somasundaram@ericsson.com</a=
>&gt;<br>
<b>Date: </b>Friday, April 5, 2019 at 6:15 AM<br>
<b>To: </b>&quot;<a href=3D"mailto:bess@ietf.org" target=3D"_blank">bess@ie=
tf.org</a>&quot; &lt;<a href=3D"mailto:bess@ietf.org" target=3D"_blank">bes=
s@ietf.org</a>&gt;<br>
<b>Cc: </b>P Muthu Arul Mozhi &lt;<a href=3D"mailto:p.muthu.arul.mozhi@eric=
sson.com" target=3D"_blank">p.muthu.arul.mozhi@ericsson.com</a>&gt;<br>
<b>Subject: </b>[bess] DF election rule in EVPN MH, for untagged interface =
- reg<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
10pt;font-family:Consolas">Hi All,</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
10pt;font-family:Consolas">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
10pt;font-family:Consolas">RFC7432, section 8.5, talks about DF election al=
gorithm (service carving algorithm)</span><u></u><u></u></p>
<pre style=3D"margin-left:36pt"><span style=3D"font-family:Consolas">only f=
or </span><span style=3D"color:black">&lt;ES, VLAN&gt; for VLAN-based servi=
ce or &lt;ES, VLAN bundle&gt; for VLAN-(aware)</span><u></u><u></u></pre>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
10pt;font-family:&quot;Courier New&quot;;color:black">bundle service</span>=
<span style=3D"font-size:10pt;font-family:Consolas">.</span><u></u><u></u><=
/p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
10pt;font-family:Consolas">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
10pt;font-family:Consolas">But there wont be any vlan id for untagged inter=
face and so I wonder</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
10pt;font-family:Consolas">how the service carving algorithm can be applied=
 to elect the DF.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
10pt;font-family:Consolas">Also, should I use the lower VLAN ID even in the=
 case of VLAN-bundle</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
10pt;font-family:Consolas">service, for electing the DF?</span><u></u><u></=
u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
10pt;font-family:Consolas">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
10pt;font-family:Consolas">Could some one help me to understand this please=
?</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
10pt;font-family:Consolas">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
10pt;font-family:Consolas">=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D&lt;snip from RFC =
7432, section 8.5&gt;=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D</span><u=
></u><u></u></p>
<h3 style=3D"margin-left:36pt"><a href=3D"https://tools.ietf.org/html/rfc74=
32#section-8.5" target=3D"_blank"><span style=3D"font-size:10pt;font-family=
:&quot;Courier New&quot;;color:black">8.5</span></a><a name=3D"m_5949779205=
721859240_section-8.5"></a><span style=3D"font-size:10pt;font-family:&quot;=
Courier New&quot;;color:black">.=C2=A0
 Designated Forwarder Election</span><u></u><u></u></h3>
<pre style=3D"margin-left:36pt"><span style=3D"color:black">=E2=80=A6</span=
><u></u><u></u></pre>
<pre style=3D"margin-left:36pt"><span style=3D"color:black">=C2=A0=C2=A0 Th=
e default procedure for DF election at the granularity of &lt;ES,</span><u>=
</u><u></u></pre>
<pre style=3D"margin-left:36pt"><span style=3D"color:black">=C2=A0=C2=A0 VL=
AN&gt; for VLAN-based service or &lt;ES, VLAN bundle&gt; for VLAN-(aware)</=
span><u></u><u></u></pre>
<pre style=3D"margin-left:36pt"><span style=3D"color:black">=C2=A0=C2=A0 bu=
ndle service is referred to as &quot;service carving&quot;. </span><u></u><=
u></u></pre>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
10pt;font-family:Consolas">=E2=80=A6</span><u></u><u></u></p>
<pre style=3D"margin-left:36pt"><span style=3D"color:black">=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 Assuming a redundancy group of N PE nodes, for VLAN-based s=
ervice,</span><u></u><u></u></pre>
<pre style=3D"margin-left:36pt"><span style=3D"color:black">=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 the PE with ordinal i is the DF for an &lt;ES, VLAN V&gt; w=
hen (V mod N)</span><u></u><u></u></pre>
<pre style=3D"margin-left:36pt"><span style=3D"color:black">=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 =3D i.=C2=A0 In the case of VLAN-(aware) bundle service, th=
en the</span><u></u><u></u></pre>
<pre style=3D"margin-left:36pt"><span style=3D"color:black">=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 numerically lowest VLAN value in that bundle on that ES MUS=
T be</span><u></u><u></u></pre>
<pre style=3D"margin-left:36pt"><span style=3D"color:black">=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 used in the modulo function.</span><u></u><u></u></pre>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
10pt;font-family:Consolas">=E2=80=A6</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
10pt;font-family:Consolas">=3D=3D=3D=3D=3D=3D=3D=3D=3D&lt;snip end&gt;=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
10pt;font-family:Consolas">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
10pt;font-family:Verdana,serif">Thanks &amp; Regards</span><u></u><u></u></=
p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
10pt;font-family:Verdana,serif">Jaikumar S</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">=C2=A0<u></u><u></u></p>
</div>
</div>

_______________________________________________<br>
BESS mailing list<br>
<a href=3D"mailto:BESS@ietf.org" target=3D"_blank">BESS@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/bess" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/listinfo/bess</a><br>
</blockquote></div></div>

--000000000000745e720585c9e435--


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From: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>
To: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
CC: Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com>, "bess@ietf.org" <bess@ietf.org>, P Muthu Arul Mozhi <p.muthu.arul.mozhi@ericsson.com>
Thread-Topic: [bess] DF election rule in EVPN MH, for untagged interface - reg
Thread-Index: AQHU63I0j0hKXYAZcUSX1MLBOHGklaYtrI6AgAA0x4A=
Date: Fri, 5 Apr 2019 16:19:31 +0000
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Subject: Re: [bess] DF election rule in EVPN MH, for untagged interface - reg
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From nobody Fri Apr  5 09:52:57 2019
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To: stephane.litkowski@orange.com, "bess@ietf.org" <bess@ietf.org>
References: <6232_1554379102_5CA5F15E_6232_163_1_9E32478DFA9976438E7A22F69B08FF924C1E3E58@OPEXCAUBMA3.corporate.adroot.infra.ftgroup>
From: "Joel M. Halpern" <jmh@joelhalpern.com>
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Date: Fri, 5 Apr 2019 12:52:50 -0400
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Subject: Re: [bess] Poll to progress draft-ietf-bess-nsh-bgp-controlplane without implementation
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I think is a useful complement to the work in RFC 8300.  It appears 
ready for publication.  Given the evolution in SFC usage, I think 
getting this out there now serves the community better than waiting for 
the implementations.  Please do progress this.

Thank you,
Joel

On 4/4/19 1:58 PM, stephane.litkowski@orange.com wrote:
> Hi WG,
> 
> draft-ietf-bess-nsh-bgp-controlplane has passed WGLC and its finishing 
> the shepherd’s review phasis (I-D update required).. It is in a good 
> shape to progress further. However we are not aware of any 
> implementation. As per our Implementation Requirement Policy, we need to 
> poll the WG to know if WG agrees to progress the document without 
> implementation.
> 
> This email starts a 2 weeks poll closing on 04/18/2019.
> 
> Please raise your support or any concern regarding the progress of this 
> document without implementation.
> 
> If you are aware of any implementation, please also state it.
> 
> https://datatracker.ietf.org/doc/draft-ietf-bess-nsh-bgp-control-plane/
> 
> Brgds,
> 
> Stephane & Matthew
> 
> _________________________________________________________________________________________________________________________
> 
> 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.
> 
> 
> _______________________________________________
> BESS mailing list
> BESS@ietf.org
> https://www.ietf.org/mailman/listinfo/bess
> 


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From: "Andrew G. Malis" <agmalis@gmail.com>
Date: Fri, 5 Apr 2019 13:02:52 -0400
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Subject: Re: [bess] Poll to progress draft-ietf-bess-nsh-bgp-controlplane without implementation
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I agree with Joel. I think a reason that we don't yet have implementations
is that this draft has three normative references that are also still
drafts (although
two of them recently joined the RFC Editor's queue and the third has passed
WG LC), so as they get implemented and we get more SFC implementations in
general, I would expect to see activity with this draft as well. It would
be a disservice to wait.

Cheers,
Andy


On Fri, Apr 5, 2019 at 12:53 PM Joel M. Halpern <jmh@joelhalpern.com> wrote=
:

> I think is a useful complement to the work in RFC 8300.  It appears
> ready for publication.  Given the evolution in SFC usage, I think
> getting this out there now serves the community better than waiting for
> the implementations.  Please do progress this.
>
> Thank you,
> Joel
>
> On 4/4/19 1:58 PM, stephane.litkowski@orange.com wrote:
> > Hi WG,
> >
> > draft-ietf-bess-nsh-bgp-controlplane has passed WGLC and its finishing
> > the shepherd=E2=80=99s review phasis (I-D update required).. It is in a=
 good
> > shape to progress further. However we are not aware of any
> > implementation. As per our Implementation Requirement Policy, we need t=
o
> > poll the WG to know if WG agrees to progress the document without
> > implementation.
> >
> > This email starts a 2 weeks poll closing on 04/18/2019.
> >
> > Please raise your support or any concern regarding the progress of this
> > document without implementation.
> >
> > If you are aware of any implementation, please also state it.
> >
> > https://datatracker.ietf.org/doc/draft-ietf-bess-nsh-bgp-control-plane/
> >
> > Brgds,
> >
> > Stephane & Matthew
> >
> >
> _________________________________________________________________________=
________________________________________________
> >
> > 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 message=
s
> 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.
> >
> >
> > _______________________________________________
> > BESS mailing list
> > BESS@ietf.org
> > https://www.ietf.org/mailman/listinfo/bess
> >
>
> _______________________________________________
> BESS mailing list
> BESS@ietf.org
> https://www.ietf.org/mailman/listinfo/bess
>

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<div dir=3D"ltr">I agree with Joel. I think a reason that we don&#39;t yet =
have implementations is that this draft has three normative references that=
=C2=A0<span class=3D"gmail-gr_ gmail-gr_348 gmail-gr-alert gmail-gr_gramm g=
mail-gr_hide gmail-gr_inline_cards gmail-gr_run_anim gmail-Grammar gmail-mu=
ltiReplace gmail-replaceWithoutSep" id=3D"gmail-348" style=3D"font-size:inh=
erit;color:inherit;display:inline;border-bottom:2px solid transparent;backg=
round-repeat:no-repeat">are also still=C2=A0</span><span class=3D"gmail-gr_=
 gmail-gr_348 gmail-gr-alert gmail-gr_gramm gmail-gr_hide gmail-gr_inline_c=
ards gmail-gr_disable_anim_appear gmail-Grammar gmail-multiReplace gmail-re=
placeWithoutSep" id=3D"gmail-348" style=3D"font-size:inherit;color:inherit;=
display:inline;border-bottom:2px solid transparent;background-repeat:no-rep=
eat">drafts=C2=A0(although two of them recently joined the RFC Editor&#39;s=
 queue and the third=C2=A0has passed WG LC)</span>, so as they get implemen=
ted and we get more SFC implementations in general, I would expect to see a=
ctivity with this draft as well. It would be a disservice to wait.<div><br>=
</div><div>Cheers,</div><div>Andy</div><div><br></div></div><br><div class=
=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Fri, Apr 5, 2019 =
at 12:53 PM Joel M. Halpern &lt;<a href=3D"mailto:jmh@joelhalpern.com">jmh@=
joelhalpern.com</a>&gt; wrote:<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">I think is a useful complement to the work in RFC 8300.=C2=
=A0 It appears <br>
ready for publication.=C2=A0 Given the evolution in SFC usage, I think <br>
getting this out there now serves the community better than waiting for <br=
>
the implementations.=C2=A0 Please do progress this.<br>
<br>
Thank you,<br>
Joel<br>
<br>
On 4/4/19 1:58 PM, <a href=3D"mailto:stephane.litkowski@orange.com" target=
=3D"_blank">stephane.litkowski@orange.com</a> wrote:<br>
&gt; Hi WG,<br>
&gt; <br>
&gt; draft-ietf-bess-nsh-bgp-controlplane has passed WGLC and its finishing=
 <br>
&gt; the shepherd=E2=80=99s review phasis (I-D update required).. It is in =
a good <br>
&gt; shape to progress further. However we are not aware of any <br>
&gt; implementation. As per our Implementation Requirement Policy, we need =
to <br>
&gt; poll the WG to know if WG agrees to progress the document without <br>
&gt; implementation.<br>
&gt; <br>
&gt; This email starts a 2 weeks poll closing on 04/18/2019.<br>
&gt; <br>
&gt; Please raise your support or any concern regarding the progress of thi=
s <br>
&gt; document without implementation.<br>
&gt; <br>
&gt; If you are aware of any implementation, please also state it.<br>
&gt; <br>
&gt; <a href=3D"https://datatracker.ietf.org/doc/draft-ietf-bess-nsh-bgp-co=
ntrol-plane/" rel=3D"noreferrer" target=3D"_blank">https://datatracker.ietf=
.org/doc/draft-ietf-bess-nsh-bgp-control-plane/</a><br>
&gt; <br>
&gt; Brgds,<br>
&gt; <br>
&gt; Stephane &amp; Matthew<br>
&gt; <br>
&gt; ______________________________________________________________________=
___________________________________________________<br>
&gt; <br>
&gt; Ce message et ses pieces jointes peuvent contenir des informations con=
fidentielles ou privilegiees et ne doivent donc<br>
&gt; pas etre diffuses, exploites ou copies sans autorisation. Si vous avez=
 recu ce message par erreur, veuillez le signaler<br>
&gt; a l&#39;expediteur et le detruire ainsi que les pieces jointes. Les me=
ssages electroniques etant susceptibles d&#39;alteration,<br>
&gt; Orange decline toute responsabilite si ce message a ete altere, deform=
e ou falsifie. Merci.<br>
&gt; <br>
&gt; This message and its attachments may contain confidential or privilege=
d information that may be protected by law;<br>
&gt; they should not be distributed, used or copied without authorisation.<=
br>
&gt; If you have received this email in error, please notify the sender and=
 delete this message and its attachments.<br>
&gt; As emails may be altered, Orange is not liable for messages that have =
been modified, changed or falsified.<br>
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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Fri, 5 Apr 2019 10:51:56 -0700
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To: Stephane Litkowski <stephane.litkowski@orange.com>
Cc: "bess@ietf.org" <bess@ietf.org>
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Subject: Re: [bess] Poll to progress draft-ietf-bess-nsh-bgp-controlplane without implementation
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Dear WG Chairs, et al.,
I support going forward with the publication
of draft-ietf-bess-nsh-bgp-control-plane despite the absence of a readily
available implementation. As Andy had noted, three other documents, that
this document refers to, had reached the state of the assured technical
stability thus minimizing the risk for the implementor. I strongly believe
that the publication of this document is in the best interest of everyone
working on aspects of SFC as it provides SFC with the comprehensive dynamic
distributed control plane solution.

Regards,
Greg.

On Thu, Apr 4, 2019 at 4:58 AM <stephane.litkowski@orange.com> wrote:

> Hi WG,
>
>
>
> draft-ietf-bess-nsh-bgp-controlplane has passed WGLC and its finishing th=
e
> shepherd=E2=80=99s review phasis (I-D update required).. It is in a good =
shape to
> progress further. However we are not aware of any implementation. As per
> our Implementation Requirement Policy, we need to poll the WG to know if =
WG
> agrees to progress the document without implementation.
>
>
>
> This email starts a 2 weeks poll closing on 04/18/2019.
>
>
>
> Please raise your support or any concern regarding the progress of this
> document without implementation.
>
> If you are aware of any implementation, please also state it.
>
>
>
>
>
> https://datatracker.ietf.org/doc/draft-ietf-bess-nsh-bgp-control-plane/
>
>
>
> Brgds,
>
>
>
> Stephane & Matthew
>
> _________________________________________________________________________=
________________________________________________
>
> Ce message et ses pieces jointes peuvent contenir des informations confid=
entielles ou privilegiees et ne doivent donc
> pas etre diffuses, exploites ou copies sans autorisation. Si vous avez re=
cu ce message par erreur, veuillez le signaler
> a l'expediteur et le detruire ainsi que les pieces jointes. Les messages =
electroniques etant susceptibles d'alteration,
> Orange decline toute responsabilite si ce message a ete altere, deforme o=
u falsifie. Merci.
>
> This message and its attachments may contain confidential or privileged i=
nformation that may be protected by law;
> they should not be distributed, used or copied without authorisation.
> If you have received this email in error, please notify the sender and de=
lete this message and its attachments.
> As emails may be altered, Orange is not liable for messages that have bee=
n modified, changed or falsified.
> Thank you.
>
> _______________________________________________
> BESS mailing list
> BESS@ietf.org
> https://www.ietf.org/mailman/listinfo/bess
>

--0000000000003617550585cc259e
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<div dir=3D"ltr"><div dir=3D"ltr">Dear WG Chairs, et al.,<div>I support goi=
ng forward with the publication of=C2=A0draft-ietf-bess-nsh-bgp-control-pla=
ne despite the absence of a readily available implementation. As Andy had n=
oted, three other documents, that this document refers to, had reached the =
state of the assured technical stability thus minimizing the risk for the i=
mplementor. I strongly believe that the publication of this document is in =
the best interest of everyone working on aspects of SFC as it provides SFC =
with the comprehensive dynamic distributed control plane solution.</div><di=
v><br></div><div>Regards,</div><div>Greg.</div></div></div><br><div class=
=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, Apr 4, 2019 =
at 4:58 AM &lt;<a href=3D"mailto:stephane.litkowski@orange.com">stephane.li=
tkowski@orange.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote=
" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);=
padding-left:1ex">





<div lang=3D"EN-US">
<div class=3D"gmail-m_6817811390951364992WordSection1">
<p class=3D"MsoNormal">Hi WG,<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">draft-ietf-bess-nsh-bgp-controlplane has passed WGLC=
 and its finishing the shepherd=E2=80=99s review phasis (I-D update require=
d).. It is in a good shape to progress further. However we are not aware of=
 any implementation. As per our Implementation
 Requirement Policy, we need to poll the WG to know if WG agrees to progres=
s the document without implementation.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">This email starts a 2 weeks poll closing on 04/18/20=
19.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Please raise your support or any concern regarding t=
he progress of this document without implementation.<u></u><u></u></p>
<p class=3D"MsoNormal">If you are aware of any implementation, please also =
state it.<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><a href=3D"https://datatracker.ietf.org/doc/draft-ie=
tf-bess-nsh-bgp-control-plane/" target=3D"_blank">https://datatracker.ietf.=
org/doc/draft-ietf-bess-nsh-bgp-control-plane/</a><u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Brgds,<u></u><u></u></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal">Stephane &amp; Matthew<u></u><u></u></p>
</div>
<pre>______________________________________________________________________=
___________________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l&#39;expediteur et le detruire ainsi que les pieces jointes. Les message=
s electroniques etant susceptibles d&#39;alteration,
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.
Thank you.
</pre></div>

_______________________________________________<br>
BESS mailing list<br>
<a href=3D"mailto:BESS@ietf.org" target=3D"_blank">BESS@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/bess" rel=3D"noreferrer" t=
arget=3D"_blank">https://www.ietf.org/mailman/listinfo/bess</a><br>
</blockquote></div>

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Subject: Re: [bess] Poll to progress draft-ietf-bess-nsh-bgp-controlplane without implementation
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Date: Fri, 5 Apr 2019 10:55:16 -0700
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: "=?utf-8?Q?stephane.litkowski=40orange.com?=" <stephane.litkowski@orange.com>, Sami Boutros <boutross=40vmware.com@dmarc.ietf.org>
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Subject: Re: [bess] Poll to progress draft-ietf-bess-nsh-bgp-controlplane without implementation
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yes/support

Cheers,
Jeff
On Apr 5, 2019, 10:53 AM -0700, Sami Boutros <boutross=40vmware.com@dmarc.ietf.org>, wrote:
> Support, Please progress the document.
> Thanks,
> Sami
> Hi WG,
> draft-ietf-bess-nsh-bgp-controlplane has passed WGLC and its finishing the shepherd's review phasis (I-D update required). It is in a good shape to progress further. However we are not aware of any implementation. As per our Implementation Requirement Policy, we need to poll the WG to know if WG agrees to progress the document without implementation.
> This email starts a 2 weeks poll closing on 04/18/2019.
> Please raise your support or any concern regarding the progress of this document without implementation.
> If you are aware of any implementation, please also state it.
> https://datatracker.ietf.org/doc/draft-ietf-bess-nsh-bgp-control-plane/
> Brgds,
> Stephane & Matthew
>
> _______________________________________________
> BESS mailing list
> BESS@ietf.org
> https://www.ietf.org/mailman/listinfo/bess

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<html xmlns=3D=22http://www.w3.org/1999/xhtml=22>
<head>
<title></title>
</head>
<body>
<div name=3D=22messageBodySection=22 style=3D=22font-size: 14px; font-fam=
ily: -apple-system, BlinkMacSystem=46ont, sans-serif;=22>yes/support</div=
>
<div name=3D=22messageSignatureSection=22><br />
<div class=3D=22match=46ont=22>Cheers,
<div style=3D=22font-size: 14px; font-family: -apple-system, BlinkMacSyst=
em=46ont, sans-serif;=22>Jeff</div>
</div>
</div>
<div name=3D=22messageReplySection=22 style=3D=22font-size: 14px; font-fa=
mily: -apple-system, BlinkMacSystem=46ont, sans-serif;=22>On Apr 5, 2019,=
 10:53 AM -0700, Sami Boutros &lt;boutross=3D40vmware.com=40dmarc.ietf.or=
g&gt;, wrote:<br />
<blockquote type=3D=22cite=22 style=3D=22margin: 5px 5px; padding-left: 1=
0px; border-left: thin solid =231abc9c;=22>
<div class=3D=22WordSection1=22>
<pre>Support, Please progress the document.</pre>
<pre> </pre>
<pre>Thanks,</pre>
<pre> </pre>
<pre>Sami</pre>
<pre> </pre>
<pre>Hi WG,</pre>
<pre> </pre>
<pre>draft-ietf-bess-nsh-bgp-controlplane has passed WGLC and its finishi=
ng the shepherd's review phasis (I-D update required). It is in a good sh=
ape to progress further. However we are not aware of any implementation. =
As per our Implementation Requirement Policy, we need to poll the WG to k=
now if WG agrees to progress the document without implementation.</pre>
<pre> </pre>
<pre>This email starts a 2 weeks poll closing on 04/18/2019.</pre>
<pre> </pre>
<pre>Please raise your support or any concern regarding the progress of t=
his document without implementation.</pre>
<pre>If you are aware of any implementation, please also state it.</pre>
<pre> </pre>
<pre> </pre>
<pre><a href=3D=22https://datatracker.ietf.org/doc/draft-ietf-bess-nsh-bg=
p-control-plane/=22>https://datatracker.ietf.org/doc/draft-ietf-bess-nsh-=
bgp-control-plane/</a></pre>
<pre> </pre>
<pre>Brgds,</pre>
<pre> </pre>
<pre>Stephane &amp; Matthew</pre>
<p class=3D=22MsoNormal=22><span style=3D=22font-size:11.0pt=22>&=23160;<=
/span></p>
</div>
=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=5F=
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BESS mailing list<br />
BESS=40ietf.org<br />
https://www.ietf.org/mailman/listinfo/bess<br /></blockquote>
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Éric Vyncke has entered the following ballot position for
draft-ietf-bess-bgp-vpls-control-flags-07: No Objection

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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

Minor comment: sections 3.1 and 3.2 have different ways of describing a
mismatch between the 2 PE. Text is clear and non ambiguous but I prefer section
3.2 "If the PEs at both ends of the PW do not agree" which is concise.



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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

— Section 3.1 —

   but the PW MUST
   NOT be prevented from coming up due to this mismatch. So, the PW MUST
   still come up but not use control word in either direction.

The second MUST seems wrong to me: the normative behaviour is already stated by
the MUST NOT, but there could be other factors that legitimately prevent the PW
from coming up, no?  Likely, this should say, “So, the PW will still come up,
...”

— Section 3.2 —

   If the PEs at both ends of the PW do not agree on the
   setting of the S-bit, the PW SHOULD NOT come up.

Why SHOULD NOT?  Why might it be allowed to come up anyway, and what would the
consequences of that be (which would need to be understood in order to not obey
the SHOULD NOT)?



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From: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
Date: Tue, 9 Apr 2019 06:23:43 +0530
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To: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>
Cc: Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com>, "bess@ietf.org" <bess@ietf.org>,  P Muthu Arul Mozhi <p.muthu.arul.mozhi@ericsson.com>
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Subject: Re: [bess] DF election rule in EVPN MH, for untagged interface - reg
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Hi Jorge,

For EVPN VPWS, I understand that service instance identifies are used as
Ethernet Tags in the DF election. However, for EVPN VPLS is it common to
configure anything other than the VLAN ID (VID) as the Ethernet Tag? Do we
have vendor implementations providing such an Ethernet Tag configuration
different from the VID for EVPN VPLS?

Regards,
Muthu

On Fri, Apr 5, 2019 at 9:49 PM Rabadan, Jorge (Nokia - US/Mountain View) <
jorge.rabadan@nokia.com> wrote:

> The Ethernet Tag that you use for DF Election does not even need to match
> what you have in the data path.
>
> Note that the definition says even =E2=80=9Cconfigured IDs=E2=80=9D.
>
>
>
> As long as you use the same ID for the BD on all the PEs attached to the
> ES, you are fine.
>
>
>
> Thx
>
> Jorge
>
>
>
> *From: *Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
> *Date: *Friday, April 5, 2019 at 5:10 PM
> *To: *"Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.co=
m
> >
> *Cc: *Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com>, "
> bess@ietf.org" <bess@ietf.org>, P Muthu Arul Mozhi <
> p.muthu.arul.mozhi@ericsson.com>
> *Subject: *Re: [bess] DF election rule in EVPN MH, for untagged interface
> - reg
>
>
>
> Thanks, Jorge. It is clear that the Ethernet Tag needs to be different
> from 0 for the purpose of DF election..
>
>
>
> One of the options a provider has for supporting untagged frames in EVPN
> VPLS multihoming in VID translation...a rule to match untagged frames and
> impose a VID at the ingress and another rule to match that VID and dispos=
e
> it at the egress.
>
>
>
> Are there any other options that can interop well?
>
>
>
> Regards,
>
> Muthu
>
>
>
> On Fri, Apr 5, 2019 at 11:11 AM Rabadan, Jorge (Nokia - US/Mountain View)=
 <
> jorge.rabadan@nokia.com> wrote:
>
> Hi,
>
>
>
> I think you should check out
> https://tools.ietf.org/html/draft-ietf-bess-evpn-df-election-framework-09
>
>
>
> This draft updates RFC7432 in certain aspects of the DF Election, and it
> is already at the RFC editor.
>
>
>
> Check out the use of Ethernet Tag in the document.
>
>
>
>    o Ethernet Tag - used to represent a Broadcast Domain that is
>
>      configured on a given ES for the purpose of DF election. Note that
>
>      any of the following may be used to represent a Broadcast Domain:
>
>      VIDs (including Q-in-Q tags), configured IDs, VNI (VXLAN Network
>
>      Identifiers), normalized VID, I-SIDs (Service Instance
>
>      Identifiers), etc., as long as the representation of the broadcast
>
>      domains is configured consistently across the multi-homed PEs
>
>      attached to that ES. The Ethernet Tag value MUST be different from
>
>      zero.
>
>
>
> Thanks.
>
> Jorge
>
>
>
> *From: *BESS <bess-bounces@ietf.org> on behalf of Jaikumar Somasundaram <
> jaikumar.somasundaram@ericsson.com>
> *Date: *Friday, April 5, 2019 at 6:15 AM
> *To: *"bess@ietf.org" <bess@ietf.org>
> *Cc: *P Muthu Arul Mozhi <p.muthu.arul.mozhi@ericsson.com>
> *Subject: *[bess] DF election rule in EVPN MH, for untagged interface -
> reg
>
>
>
> Hi All,
>
>
>
> RFC7432, section 8.5, talks about DF election algorithm (service carving
> algorithm)
>
> only for <ES, VLAN> for VLAN-based service or <ES, VLAN bundle> for VLAN-=
(aware)
>
> bundle service.
>
>
>
> But there wont be any vlan id for untagged interface and so I wonder
>
> how the service carving algorithm can be applied to elect the DF.
>
> Also, should I use the lower VLAN ID even in the case of VLAN-bundle
>
> service, for electing the DF?
>
>
>
> Could some one help me to understand this please?
>
>
>
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<snip from RFC 7432, section 8.5>=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> 8.5 <https://tools.ietf.org/html/rfc7432#section-8.5>.  Designated
> Forwarder Election
>
> =E2=80=A6
>
>    The default procedure for DF election at the granularity of <ES,
>
>    VLAN> for VLAN-based service or <ES, VLAN bundle> for VLAN-(aware)
>
>    bundle service is referred to as "service carving".
>
> =E2=80=A6
>
>       Assuming a redundancy group of N PE nodes, for VLAN-based service,
>
>       the PE with ordinal i is the DF for an <ES, VLAN V> when (V mod N)
>
>       =3D i.  In the case of VLAN-(aware) bundle service, then the
>
>       numerically lowest VLAN value in that bundle on that ES MUST be
>
>       used in the modulo function.
>
> =E2=80=A6
>
> =3D=3D=3D=3D=3D=3D=3D=3D=3D<snip end>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D
>
>
>
> Thanks & Regards
>
> Jaikumar S
>
>
>
> _______________________________________________
> BESS mailing list
> BESS@ietf.org
> https://www.ietf.org/mailman/listinfo/bess
>
>

--00000000000065d3d305860e639c
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr"><div class=3D"gmail_default" style=3D"fon=
t-family:arial,helvetica,sans-serif;font-size:small">Hi=C2=A0Jorge,</div><d=
iv 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-famil=
y:arial,helvetica,sans-serif;font-size:small">For EVPN VPWS, I understand t=
hat service instance identifies are used as Ethernet Tags in the DF electio=
n. However, for EVPN VPLS is it common to configure anything other than the=
 VLAN ID (VID) as the Ethernet Tag? Do we have vendor implementations provi=
ding such an Ethernet Tag configuration different from the VID for EVPN VPL=
S?</div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,s=
ans-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" style=3D"font-family:arial,helvetica,sans-serif;fon=
t-size:small">Muthu</div></div><br><div class=3D"gmail_quote"><div dir=3D"l=
tr" class=3D"gmail_attr">On Fri, Apr 5, 2019 at 9:49 PM Rabadan, Jorge (Nok=
ia - US/Mountain View) &lt;<a href=3D"mailto:jorge.rabadan@nokia.com">jorge=
.rabadan@nokia.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote=
" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);=
padding-left:1ex">





<div lang=3D"EN-US">
<div class=3D"gmail-m_4234931300413341097WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">The Ethernet Tag that you use for DF Election does not even need to match=
 what you have in the data path.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">Note that the definition says even =E2=80=9Cconfigured IDs=E2=80=9D.<u></=
u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">As long as you use the same ID for the BD on all the PEs attached to the =
ES, you are fine.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">Thx<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">Jorge<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
"><u></u>=C2=A0<u></u></span></p>
<div style=3D"border-right:none;border-bottom:none;border-left:none;border-=
top:1pt solid rgb(181,196,223);padding:3pt 0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><b><span style=3D"font-si=
ze:12pt;color:black">From:
</span></b><span style=3D"font-size:12pt;color:black">Muthu Arul Mozhi Peru=
mal &lt;<a href=3D"mailto:muthu.arul@gmail.com" target=3D"_blank">muthu.aru=
l@gmail.com</a>&gt;<br>
<b>Date: </b>Friday, April 5, 2019 at 5:10 PM<br>
<b>To: </b>&quot;Rabadan, Jorge (Nokia - US/Mountain View)&quot; &lt;<a hre=
f=3D"mailto:jorge.rabadan@nokia.com" target=3D"_blank">jorge.rabadan@nokia.=
com</a>&gt;<br>
<b>Cc: </b>Jaikumar Somasundaram &lt;<a href=3D"mailto:jaikumar.somasundara=
m@ericsson.com" target=3D"_blank">jaikumar.somasundaram@ericsson.com</a>&gt=
;, &quot;<a href=3D"mailto:bess@ietf.org" target=3D"_blank">bess@ietf.org</=
a>&quot; &lt;<a href=3D"mailto:bess@ietf.org" target=3D"_blank">bess@ietf.o=
rg</a>&gt;, P Muthu Arul Mozhi &lt;<a href=3D"mailto:p.muthu.arul.mozhi@eri=
csson.com" target=3D"_blank">p.muthu.arul.mozhi@ericsson.com</a>&gt;<br>
<b>Subject: </b>Re: [bess] DF election rule in EVPN MH, for untagged interf=
ace - reg<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
12pt;font-family:Arial,sans-serif">Thanks, Jorge. It is clear that the Ethe=
rnet Tag needs to be different from 0 for the purpose of DF election..=C2=
=A0<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
12pt;font-family:Arial,sans-serif"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
12pt;font-family:Arial,sans-serif">One of the options a provider has for su=
pporting untagged frames in EVPN VPLS multihoming in VID translation...a ru=
le to match untagged frames and
 impose a VID at the ingress and another rule to match that VID and dispose=
 it at the egress.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
12pt;font-family:Arial,sans-serif"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
12pt;font-family:Arial,sans-serif">Are there any other options that can int=
erop well?<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
12pt;font-family:Arial,sans-serif"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
12pt;font-family:Arial,sans-serif">Regards,<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
12pt;font-family:Arial,sans-serif">Muthu<u></u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">On Fri, Apr 5, 2019 at 11=
:11 AM Rabadan, Jorge (Nokia - US/Mountain View) &lt;<a href=3D"mailto:jorg=
e.rabadan@nokia.com" target=3D"_blank">jorge.rabadan@nokia.com</a>&gt; wrot=
e:<u></u><u></u></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin-left:4=
.8pt;margin-right:0cm">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">Hi,</span><u></u><u><=
/u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">=C2=A0</span><u></u><=
u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">I think you should ch=
eck out <a href=3D"https://tools.ietf.org/html/draft-ietf-bess-evpn-df-elec=
tion-framework-09" target=3D"_blank">
https://tools.ietf.org/html/draft-ietf-bess-evpn-df-election-framework-09</=
a> </span>
<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">=C2=A0</span><u></u><=
u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">This draft updates RF=
C7432 in certain aspects of the DF Election, and it is already at the RFC e=
ditor.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">=C2=A0</span><u></u><=
u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">Check out the use of =
Ethernet Tag in the document.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">=C2=A0</span><u></u><=
u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck">=C2=A0=C2=A0 o Ethernet Tag - used to represent a Broadcast Domain that=
 is</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck">=C2=A0=C2=A0=C2=A0=C2=A0 configured on a given ES for the purpose of DF=
 election. Note that</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck">=C2=A0=C2=A0=C2=A0=C2=A0 any of the following may be used to represent =
a Broadcast Domain:</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck">=C2=A0=C2=A0=C2=A0=C2=A0 VIDs (including Q-in-Q tags), configured IDs, =
VNI (VXLAN Network</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck">=C2=A0=C2=A0=C2=A0=C2=A0 Identifiers), normalized VID, I-SIDs (Service =
Instance</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck">=C2=A0=C2=A0=C2=A0=C2=A0 Identifiers), etc., as long as the representat=
ion of the broadcast</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck">=C2=A0=C2=A0=C2=A0=C2=A0 domains is configured consistently across the =
multi-homed PEs</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck">=C2=A0=C2=A0=C2=A0=C2=A0 attached to that ES. The Ethernet Tag value MU=
ST be different from</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck">=C2=A0=C2=A0=C2=A0=C2=A0 zero.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">=C2=A0</span><u></u><=
u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">Thanks.</span><u></u>=
<u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">Jorge</span><u></u><u=
></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">=C2=A0</span><u></u><=
u></u></p>
<div style=3D"border-right:none;border-bottom:none;border-left:none;border-=
top:1pt solid rgb(181,196,223);padding:3pt 0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<b><span style=3D"font-size:12pt;color:black">From: </span></b><span style=
=3D"font-size:12pt;color:black">BESS &lt;<a href=3D"mailto:bess-bounces@iet=
f.org" target=3D"_blank">bess-bounces@ietf.org</a>&gt; on behalf of Jaikuma=
r Somasundaram &lt;<a href=3D"mailto:jaikumar.somasundaram@ericsson.com" ta=
rget=3D"_blank">jaikumar.somasundaram@ericsson.com</a>&gt;<br>
<b>Date: </b>Friday, April 5, 2019 at 6:15 AM<br>
<b>To: </b>&quot;<a href=3D"mailto:bess@ietf.org" target=3D"_blank">bess@ie=
tf.org</a>&quot; &lt;<a href=3D"mailto:bess@ietf.org" target=3D"_blank">bes=
s@ietf.org</a>&gt;<br>
<b>Cc: </b>P Muthu Arul Mozhi &lt;<a href=3D"mailto:p.muthu.arul.mozhi@eric=
sson.com" target=3D"_blank">p.muthu.arul.mozhi@ericsson.com</a>&gt;<br>
<b>Subject: </b>[bess] DF election rule in EVPN MH, for untagged interface =
- reg</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
=C2=A0<u></u><u></u></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10pt;font-family:Consolas">Hi All,</span><u></u><u=
></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10pt;font-family:Consolas">=C2=A0</span><u></u><u>=
</u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10pt;font-family:Consolas">RFC7432, section 8.5, t=
alks about DF election algorithm (service carving algorithm)</span><u></u><=
u></u></p>
<pre style=3D"margin-left:72pt"><span style=3D"font-family:Consolas">only f=
or </span><span style=3D"color:black">&lt;ES, VLAN&gt; for VLAN-based servi=
ce or &lt;ES, VLAN bundle&gt; for VLAN-(aware)</span><u></u><u></u></pre>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck">bundle service</span><span style=3D"font-size:10pt;font-family:Consolas=
">.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10pt;font-family:Consolas">=C2=A0</span><u></u><u>=
</u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10pt;font-family:Consolas">But there wont be any v=
lan id for untagged interface and so I wonder</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10pt;font-family:Consolas">how the service carving=
 algorithm can be applied to elect the DF.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10pt;font-family:Consolas">Also, should I use the =
lower VLAN ID even in the case of VLAN-bundle</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10pt;font-family:Consolas">service, for electing t=
he DF?</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10pt;font-family:Consolas">=C2=A0</span><u></u><u>=
</u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10pt;font-family:Consolas">Could some one help me =
to understand this please?</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10pt;font-family:Consolas">=C2=A0</span><u></u><u>=
</u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10pt;font-family:Consolas">=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D&lt;snip from RFC 7432, section 8.5&gt;=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D</span><u></u><u></u></p>
<h3 style=3D"margin-left:72pt"><a href=3D"https://tools.ietf.org/html/rfc74=
32#section-8.5" target=3D"_blank"><span style=3D"font-size:10pt;font-family=
:&quot;Courier New&quot;;color:black">8.5</span></a><a name=3D"m_4234931300=
413341097_m_5949779205721859240_section-8.5"></a><span style=3D"font-size:1=
0pt;font-family:&quot;Courier New&quot;;color:black">.=C2=A0
 Designated Forwarder Election</span><u></u><u></u></h3>
<pre style=3D"margin-left:72pt"><span style=3D"color:black">=E2=80=A6</span=
><u></u><u></u></pre>
<pre style=3D"margin-left:72pt"><span style=3D"color:black">=C2=A0=C2=A0 Th=
e default procedure for DF election at the granularity of &lt;ES,</span><u>=
</u><u></u></pre>
<pre style=3D"margin-left:72pt"><span style=3D"color:black">=C2=A0=C2=A0 VL=
AN&gt; for VLAN-based service or &lt;ES, VLAN bundle&gt; for VLAN-(aware)</=
span><u></u><u></u></pre>
<pre style=3D"margin-left:72pt"><span style=3D"color:black">=C2=A0=C2=A0 bu=
ndle service is referred to as &quot;service carving&quot;. </span><u></u><=
u></u></pre>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10pt;font-family:Consolas">=E2=80=A6</span><u></u>=
<u></u></p>
<pre style=3D"margin-left:72pt"><span style=3D"color:black">=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 Assuming a redundancy group of N PE nodes, for VLAN-based s=
ervice,</span><u></u><u></u></pre>
<pre style=3D"margin-left:72pt"><span style=3D"color:black">=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 the PE with ordinal i is the DF for an &lt;ES, VLAN V&gt; w=
hen (V mod N)</span><u></u><u></u></pre>
<pre style=3D"margin-left:72pt"><span style=3D"color:black">=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 =3D i.=C2=A0 In the case of VLAN-(aware) bundle service, th=
en the</span><u></u><u></u></pre>
<pre style=3D"margin-left:72pt"><span style=3D"color:black">=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 numerically lowest VLAN value in that bundle on that ES MUS=
T be</span><u></u><u></u></pre>
<pre style=3D"margin-left:72pt"><span style=3D"color:black">=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 used in the modulo function.</span><u></u><u></u></pre>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10pt;font-family:Consolas">=E2=80=A6</span><u></u>=
<u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10pt;font-family:Consolas">=3D=3D=3D=3D=3D=3D=3D=
=3D=3D&lt;snip end&gt;=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D</span><u></=
u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10pt;font-family:Consolas">=C2=A0</span><u></u><u>=
</u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10pt;font-family:Verdana,serif">Thanks &amp; Regar=
ds</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10pt;font-family:Verdana,serif">Jaikumar S</span><=
u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
=C2=A0<u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">_________________________=
______________________<br>
BESS mailing list<br>
<a href=3D"mailto:BESS@ietf.org" target=3D"_blank">BESS@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/bess" target=3D"_blank">ht=
tps://www.ietf.org/mailman/listinfo/bess</a><u></u><u></u></p>
</blockquote>
</div>
</div>
</div>
</div>

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

--00000000000065d3d305860e639c--


From nobody Mon Apr  8 18:32:33 2019
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Subject: [bess] Roman Danyliw's No Objection on draft-ietf-bess-bgp-vpls-control-flags-07: (with COMMENT)
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Roman Danyliw has entered the following ballot position for
draft-ietf-bess-bgp-vpls-control-flags-07: No Objection

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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

A few nits:

(1) In Section 3.1.  Typo.  s/seqence/sequence/

(2) Section 4.  Typo. s/VPLS,there/VPLS, there/

(3) Section 5.1.  Editorial.  s/the below specified network topology/the
network topology specified in Section 6/



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From: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>
To: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
CC: Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com>, "bess@ietf.org" <bess@ietf.org>, P Muthu Arul Mozhi <p.muthu.arul.mozhi@ericsson.com>
Thread-Topic: [bess] DF election rule in EVPN MH, for untagged interface - reg
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Date: Tue, 9 Apr 2019 05:47:08 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/mgx_3-j7rnyQ5mRwP6zS6uq_LDc>
Subject: Re: [bess] DF election rule in EVPN MH, for untagged interface - reg
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From: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
Date: Tue, 9 Apr 2019 11:40:45 +0530
Message-ID: <CAKz0y8yGbSWBMqrY9Zk-wC7oTRWOgyWRzdkNFGhgAv8GRwSDWw@mail.gmail.com>
To: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>
Cc: Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com>, "bess@ietf.org" <bess@ietf.org>,  P Muthu Arul Mozhi <p.muthu.arul.mozhi@ericsson.com>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/hlhTYAih5gAwuFj38upn2tsFnfs>
Subject: Re: [bess] DF election rule in EVPN MH, for untagged interface - reg
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Hi Jorge,

Okay, thanks for the clarification..

Regards,
Muthu

On Tue, Apr 9, 2019 at 11:17 AM Rabadan, Jorge (Nokia - US/Mountain View) <
jorge.rabadan@nokia.com> wrote:

> Hi,
>
>
>
> I think the definition of Ethernet Tag in the framework draft should be
> clear enough.
>
> There are implementations using configured IDs.
>
> Jorge
>
>
>
>
>
> *From: *Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
> *Date: *Tuesday, April 9, 2019 at 2:54 AM
> *To: *"Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.co=
m
> >
> *Cc: *Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com>, "
> bess@ietf.org" <bess@ietf.org>, P Muthu Arul Mozhi <
> p.muthu.arul.mozhi@ericsson.com>
> *Subject: *Re: [bess] DF election rule in EVPN MH, for untagged interface
> - reg
>
>
>
> Hi Jorge,
>
>
>
> For EVPN VPWS, I understand that service instance identifies are used as
> Ethernet Tags in the DF election. However, for EVPN VPLS is it common to
> configure anything other than the VLAN ID (VID) as the Ethernet Tag? Do w=
e
> have vendor implementations providing such an Ethernet Tag configuration
> different from the VID for EVPN VPLS?
>
>
>
> Regards,
>
> Muthu
>
>
>
> On Fri, Apr 5, 2019 at 9:49 PM Rabadan, Jorge (Nokia - US/Mountain View) =
<
> jorge.rabadan@nokia.com> wrote:
>
> The Ethernet Tag that you use for DF Election does not even need to match
> what you have in the data path.
>
> Note that the definition says even =E2=80=9Cconfigured IDs=E2=80=9D.
>
>
>
> As long as you use the same ID for the BD on all the PEs attached to the
> ES, you are fine.
>
>
>
> Thx
>
> Jorge
>
>
>
> *From: *Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
> *Date: *Friday, April 5, 2019 at 5:10 PM
> *To: *"Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.co=
m
> >
> *Cc: *Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com>, "
> bess@ietf.org" <bess@ietf.org>, P Muthu Arul Mozhi <
> p.muthu.arul.mozhi@ericsson.com>
> *Subject: *Re: [bess] DF election rule in EVPN MH, for untagged interface
> - reg
>
>
>
> Thanks, Jorge. It is clear that the Ethernet Tag needs to be different
> from 0 for the purpose of DF election..
>
>
>
> One of the options a provider has for supporting untagged frames in EVPN
> VPLS multihoming in VID translation...a rule to match untagged frames and
> impose a VID at the ingress and another rule to match that VID and dispos=
e
> it at the egress.
>
>
>
> Are there any other options that can interop well?
>
>
>
> Regards,
>
> Muthu
>
>
>
> On Fri, Apr 5, 2019 at 11:11 AM Rabadan, Jorge (Nokia - US/Mountain View)=
 <
> jorge.rabadan@nokia.com> wrote:
>
> Hi,
>
>
>
> I think you should check out
> https://tools.ietf.org/html/draft-ietf-bess-evpn-df-election-framework-09
>
>
>
> This draft updates RFC7432 in certain aspects of the DF Election, and it
> is already at the RFC editor.
>
>
>
> Check out the use of Ethernet Tag in the document.
>
>
>
>    o Ethernet Tag - used to represent a Broadcast Domain that is
>
>      configured on a given ES for the purpose of DF election. Note that
>
>      any of the following may be used to represent a Broadcast Domain:
>
>      VIDs (including Q-in-Q tags), configured IDs, VNI (VXLAN Network
>
>      Identifiers), normalized VID, I-SIDs (Service Instance
>
>      Identifiers), etc., as long as the representation of the broadcast
>
>      domains is configured consistently across the multi-homed PEs
>
>      attached to that ES. The Ethernet Tag value MUST be different from
>
>      zero.
>
>
>
> Thanks.
>
> Jorge
>
>
>
> *From: *BESS <bess-bounces@ietf.org> on behalf of Jaikumar Somasundaram <
> jaikumar.somasundaram@ericsson.com>
> *Date: *Friday, April 5, 2019 at 6:15 AM
> *To: *"bess@ietf.org" <bess@ietf.org>
> *Cc: *P Muthu Arul Mozhi <p.muthu.arul.mozhi@ericsson.com>
> *Subject: *[bess] DF election rule in EVPN MH, for untagged interface -
> reg
>
>
>
> Hi All,
>
>
>
> RFC7432, section 8.5, talks about DF election algorithm (service carving
> algorithm)
>
> only for <ES, VLAN> for VLAN-based service or <ES, VLAN bundle> for VLAN-=
(aware)
>
> bundle service.
>
>
>
> But there wont be any vlan id for untagged interface and so I wonder
>
> how the service carving algorithm can be applied to elect the DF.
>
> Also, should I use the lower VLAN ID even in the case of VLAN-bundle
>
> service, for electing the DF?
>
>
>
> Could some one help me to understand this please?
>
>
>
> =3D=3D=3D=3D=3D=3D=3D=3D=3D=3D<snip from RFC 7432, section 8.5>=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D
> 8.5 <https://tools.ietf.org/html/rfc7432#section-8.5>.  Designated
> Forwarder Election
>
> =E2=80=A6
>
>    The default procedure for DF election at the granularity of <ES,
>
>    VLAN> for VLAN-based service or <ES, VLAN bundle> for VLAN-(aware)
>
>    bundle service is referred to as "service carving".
>
> =E2=80=A6
>
>       Assuming a redundancy group of N PE nodes, for VLAN-based service,
>
>       the PE with ordinal i is the DF for an <ES, VLAN V> when (V mod N)
>
>       =3D i.  In the case of VLAN-(aware) bundle service, then the
>
>       numerically lowest VLAN value in that bundle on that ES MUST be
>
>       used in the modulo function.
>
> =E2=80=A6
>
> =3D=3D=3D=3D=3D=3D=3D=3D=3D<snip end>=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D
>
>
>
> Thanks & Regards
>
> Jaikumar S
>
>
>
> _______________________________________________
> BESS mailing list
> BESS@ietf.org
> https://www.ietf.org/mailman/listinfo/bess
>
>

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<div dir=3D"ltr"><div dir=3D"ltr"><div class=3D"gmail_default" style=3D"fon=
t-family:arial,helvetica,sans-serif;font-size:small">Hi=C2=A0Jorge,</div><d=
iv 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-famil=
y:arial,helvetica,sans-serif;font-size:small">Okay, thanks for the clarific=
ation..</div><div class=3D"gmail_default" style=3D"font-family:arial,helvet=
ica,sans-serif;font-size:small"><br></div><div class=3D"gmail_default" styl=
e=3D"font-family:arial,helvetica,sans-serif;font-size:small">Regards,</div>=
<div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-seri=
f;font-size:small">Muthu</div></div><br><div class=3D"gmail_quote"><div dir=
=3D"ltr" class=3D"gmail_attr">On Tue, Apr 9, 2019 at 11:17 AM Rabadan, Jorg=
e (Nokia - US/Mountain View) &lt;<a href=3D"mailto:jorge.rabadan@nokia.com"=
>jorge.rabadan@nokia.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail=
_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204=
,204);padding-left:1ex">





<div lang=3D"EN-US">
<div class=3D"gmail-m_5336892221052856809WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">Hi,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">I think the definition of Ethernet Tag in the framework draft should be c=
lear enough.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">There are implementations using configured IDs.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">Jorge<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
"><u></u>=C2=A0<u></u></span></p>
<div style=3D"border-right:none;border-bottom:none;border-left:none;border-=
top:1pt solid rgb(181,196,223);padding:3pt 0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><b><span style=3D"font-si=
ze:12pt;color:black">From:
</span></b><span style=3D"font-size:12pt;color:black">Muthu Arul Mozhi Peru=
mal &lt;<a href=3D"mailto:muthu.arul@gmail.com" target=3D"_blank">muthu.aru=
l@gmail.com</a>&gt;<br>
<b>Date: </b>Tuesday, April 9, 2019 at 2:54 AM<br>
<b>To: </b>&quot;Rabadan, Jorge (Nokia - US/Mountain View)&quot; &lt;<a hre=
f=3D"mailto:jorge.rabadan@nokia.com" target=3D"_blank">jorge.rabadan@nokia.=
com</a>&gt;<br>
<b>Cc: </b>Jaikumar Somasundaram &lt;<a href=3D"mailto:jaikumar.somasundara=
m@ericsson.com" target=3D"_blank">jaikumar.somasundaram@ericsson.com</a>&gt=
;, &quot;<a href=3D"mailto:bess@ietf.org" target=3D"_blank">bess@ietf.org</=
a>&quot; &lt;<a href=3D"mailto:bess@ietf.org" target=3D"_blank">bess@ietf.o=
rg</a>&gt;, P Muthu Arul Mozhi &lt;<a href=3D"mailto:p.muthu.arul.mozhi@eri=
csson.com" target=3D"_blank">p.muthu.arul.mozhi@ericsson.com</a>&gt;<br>
<b>Subject: </b>Re: [bess] DF election rule in EVPN MH, for untagged interf=
ace - reg<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
12pt;font-family:Arial,sans-serif">Hi=C2=A0Jorge,<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
12pt;font-family:Arial,sans-serif"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
12pt;font-family:Arial,sans-serif">For EVPN VPWS, I understand that service=
 instance identifies are used as Ethernet Tags in the DF election. However,=
 for EVPN VPLS is it common to configure
 anything other than the VLAN ID (VID) as the Ethernet Tag? Do we have vend=
or implementations providing such an Ethernet Tag configuration different f=
rom the VID for EVPN VPLS?<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
12pt;font-family:Arial,sans-serif"><u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
12pt;font-family:Arial,sans-serif">Regards,<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><span style=3D"font-size:=
12pt;font-family:Arial,sans-serif">Muthu<u></u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">On Fri, Apr 5, 2019 at 9:=
49 PM Rabadan, Jorge (Nokia - US/Mountain View) &lt;<a href=3D"mailto:jorge=
.rabadan@nokia.com" target=3D"_blank">jorge.rabadan@nokia.com</a>&gt; wrote=
:<u></u><u></u></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin-left:4=
.8pt;margin-right:0cm">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">The Ethernet Tag that=
 you use for DF Election does not even need to match what you have in the d=
ata path.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">Note that the definit=
ion says even =E2=80=9Cconfigured IDs=E2=80=9D.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">=C2=A0</span><u></u><=
u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">As long as you use th=
e same ID for the BD on all the PEs attached to the ES, you are fine.</span=
><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">=C2=A0</span><u></u><=
u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">Thx</span><u></u><u><=
/u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">Jorge</span><u></u><u=
></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">=C2=A0</span><u></u><=
u></u></p>
<div style=3D"border-right:none;border-bottom:none;border-left:none;border-=
top:1pt solid rgb(181,196,223);padding:3pt 0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<b><span style=3D"font-size:12pt;color:black">From: </span></b><span style=
=3D"font-size:12pt;color:black">Muthu Arul Mozhi Perumal &lt;<a href=3D"mai=
lto:muthu.arul@gmail.com" target=3D"_blank">muthu.arul@gmail.com</a>&gt;<br=
>
<b>Date: </b>Friday, April 5, 2019 at 5:10 PM<br>
<b>To: </b>&quot;Rabadan, Jorge (Nokia - US/Mountain View)&quot; &lt;<a hre=
f=3D"mailto:jorge.rabadan@nokia.com" target=3D"_blank">jorge.rabadan@nokia.=
com</a>&gt;<br>
<b>Cc: </b>Jaikumar Somasundaram &lt;<a href=3D"mailto:jaikumar.somasundara=
m@ericsson.com" target=3D"_blank">jaikumar.somasundaram@ericsson.com</a>&gt=
;, &quot;<a href=3D"mailto:bess@ietf.org" target=3D"_blank">bess@ietf.org</=
a>&quot; &lt;<a href=3D"mailto:bess@ietf.org" target=3D"_blank">bess@ietf.o=
rg</a>&gt;,
 P Muthu Arul Mozhi &lt;<a href=3D"mailto:p.muthu.arul.mozhi@ericsson.com" =
target=3D"_blank">p.muthu.arul.mozhi@ericsson.com</a>&gt;<br>
<b>Subject: </b>Re: [bess] DF election rule in EVPN MH, for untagged interf=
ace - reg</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
=C2=A0<u></u><u></u></p>
</div>
<div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:12pt;font-family:Arial,sans-serif">Thanks, Jorge. =
It is clear that the Ethernet Tag needs to be different from 0 for the purp=
ose of DF election..=C2=A0</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:12pt;font-family:Arial,sans-serif">=C2=A0</span><u=
></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:12pt;font-family:Arial,sans-serif">One of the opti=
ons a provider has for supporting untagged frames in EVPN VPLS multihoming =
in VID translation...a rule to match untagged frames and impose a VID at th=
e ingress and another rule to
 match that VID and dispose it at the egress.</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:12pt;font-family:Arial,sans-serif">=C2=A0</span><u=
></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:12pt;font-family:Arial,sans-serif">Are there any o=
ther options that can interop well?</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:12pt;font-family:Arial,sans-serif">=C2=A0</span><u=
></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:12pt;font-family:Arial,sans-serif">Regards,</span>=
<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:12pt;font-family:Arial,sans-serif">Muthu</span><u>=
</u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
=C2=A0<u></u><u></u></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
On Fri, Apr 5, 2019 at 11:11 AM Rabadan, Jorge (Nokia - US/Mountain View) &=
lt;<a href=3D"mailto:jorge.rabadan@nokia.com" target=3D"_blank">jorge.rabad=
an@nokia.com</a>&gt; wrote:<u></u><u></u></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0cm 0cm 0cm 6pt;margin:5pt 0c=
m 5pt 4.8pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">Hi,</span><u></u><u><=
/u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">=C2=A0</span><u></u><=
u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">I think you should ch=
eck out <a href=3D"https://tools.ietf.org/html/draft-ietf-bess-evpn-df-elec=
tion-framework-09" target=3D"_blank">
https://tools.ietf.org/html/draft-ietf-bess-evpn-df-election-framework-09</=
a> </span>
<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">=C2=A0</span><u></u><=
u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">This draft updates RF=
C7432 in certain aspects of the DF Election, and it is already at the RFC e=
ditor.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">=C2=A0</span><u></u><=
u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">Check out the use of =
Ethernet Tag in the document.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">=C2=A0</span><u></u><=
u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck">=C2=A0=C2=A0 o Ethernet Tag - used to represent a Broadcast Domain that=
 is</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck">=C2=A0=C2=A0=C2=A0=C2=A0 configured on a given ES for the purpose of DF=
 election. Note that</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck">=C2=A0=C2=A0=C2=A0=C2=A0 any of the following may be used to represent =
a Broadcast Domain:</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck">=C2=A0=C2=A0=C2=A0=C2=A0 VIDs (including Q-in-Q tags), configured IDs, =
VNI (VXLAN Network</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck">=C2=A0=C2=A0=C2=A0=C2=A0 Identifiers), normalized VID, I-SIDs (Service =
Instance</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck">=C2=A0=C2=A0=C2=A0=C2=A0 Identifiers), etc., as long as the representat=
ion of the broadcast</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck">=C2=A0=C2=A0=C2=A0=C2=A0 domains is configured consistently across the =
multi-homed PEs</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck">=C2=A0=C2=A0=C2=A0=C2=A0 attached to that ES. The Ethernet Tag value MU=
ST be different from</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck">=C2=A0=C2=A0=C2=A0=C2=A0 zero.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">=C2=A0</span><u></u><=
u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">Thanks.</span><u></u>=
<u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">Jorge</span><u></u><u=
></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">=C2=A0</span><u></u><=
u></u></p>
<div style=3D"border-right:none;border-bottom:none;border-left:none;border-=
top:1pt solid rgb(181,196,223);padding:3pt 0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:108pt">
<b><span style=3D"font-size:12pt;color:black">From: </span></b><span style=
=3D"font-size:12pt;color:black">BESS &lt;<a href=3D"mailto:bess-bounces@iet=
f.org" target=3D"_blank">bess-bounces@ietf.org</a>&gt; on behalf of Jaikuma=
r Somasundaram &lt;<a href=3D"mailto:jaikumar.somasundaram@ericsson.com" ta=
rget=3D"_blank">jaikumar.somasundaram@ericsson.com</a>&gt;<br>
<b>Date: </b>Friday, April 5, 2019 at 6:15 AM<br>
<b>To: </b>&quot;<a href=3D"mailto:bess@ietf.org" target=3D"_blank">bess@ie=
tf.org</a>&quot; &lt;<a href=3D"mailto:bess@ietf.org" target=3D"_blank">bes=
s@ietf.org</a>&gt;<br>
<b>Cc: </b>P Muthu Arul Mozhi &lt;<a href=3D"mailto:p.muthu.arul.mozhi@eric=
sson.com" target=3D"_blank">p.muthu.arul.mozhi@ericsson.com</a>&gt;<br>
<b>Subject: </b>[bess] DF election rule in EVPN MH, for untagged interface =
- reg</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:108pt">
=C2=A0<u></u><u></u></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:108pt">
<span style=3D"font-size:10pt;font-family:Consolas">Hi All,</span><u></u><u=
></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:108pt">
<span style=3D"font-size:10pt;font-family:Consolas">=C2=A0</span><u></u><u>=
</u></p>
<p class=3D"MsoNormal" style=3D"margin-left:108pt">
<span style=3D"font-size:10pt;font-family:Consolas">RFC7432, section 8.5, t=
alks about DF election algorithm (service carving algorithm)</span><u></u><=
u></u></p>
<pre style=3D"margin-left:108pt"><span style=3D"font-family:Consolas">only =
for </span><span style=3D"color:black">&lt;ES, VLAN&gt; for VLAN-based serv=
ice or &lt;ES, VLAN bundle&gt; for VLAN-(aware)</span><u></u><u></u></pre>
<p class=3D"MsoNormal" style=3D"margin-left:108pt">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck">bundle service</span><span style=3D"font-size:10pt;font-family:Consolas=
">.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:108pt">
<span style=3D"font-size:10pt;font-family:Consolas">=C2=A0</span><u></u><u>=
</u></p>
<p class=3D"MsoNormal" style=3D"margin-left:108pt">
<span style=3D"font-size:10pt;font-family:Consolas">But there wont be any v=
lan id for untagged interface and so I wonder</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:108pt">
<span style=3D"font-size:10pt;font-family:Consolas">how the service carving=
 algorithm can be applied to elect the DF.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:108pt">
<span style=3D"font-size:10pt;font-family:Consolas">Also, should I use the =
lower VLAN ID even in the case of VLAN-bundle</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:108pt">
<span style=3D"font-size:10pt;font-family:Consolas">service, for electing t=
he DF?</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:108pt">
<span style=3D"font-size:10pt;font-family:Consolas">=C2=A0</span><u></u><u>=
</u></p>
<p class=3D"MsoNormal" style=3D"margin-left:108pt">
<span style=3D"font-size:10pt;font-family:Consolas">Could some one help me =
to understand this please?</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:108pt">
<span style=3D"font-size:10pt;font-family:Consolas">=C2=A0</span><u></u><u>=
</u></p>
<p class=3D"MsoNormal" style=3D"margin-left:108pt">
<span style=3D"font-size:10pt;font-family:Consolas">=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D&lt;snip from RFC 7432, section 8.5&gt;=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D</span><u></u><u></u></p>
<h3 style=3D"margin-left:108pt"><a href=3D"https://tools.ietf.org/html/rfc7=
432#section-8.5" target=3D"_blank"><span style=3D"font-size:10pt;font-famil=
y:&quot;Courier New&quot;;color:black">8.5</span></a><a name=3D"m_533689222=
1052856809_m_4234931300413341097_m_5949779205721859"></a><span style=3D"fon=
t-size:10pt;font-family:&quot;Courier New&quot;;color:black">.=C2=A0
 Designated Forwarder Election</span><u></u><u></u></h3>
<pre style=3D"margin-left:108pt"><span style=3D"color:black">=E2=80=A6</spa=
n><u></u><u></u></pre>
<pre style=3D"margin-left:108pt"><span style=3D"color:black">=C2=A0=C2=A0 T=
he default procedure for DF election at the granularity of &lt;ES,</span><u=
></u><u></u></pre>
<pre style=3D"margin-left:108pt"><span style=3D"color:black">=C2=A0=C2=A0 V=
LAN&gt; for VLAN-based service or &lt;ES, VLAN bundle&gt; for VLAN-(aware)<=
/span><u></u><u></u></pre>
<pre style=3D"margin-left:108pt"><span style=3D"color:black">=C2=A0=C2=A0 b=
undle service is referred to as &quot;service carving&quot;. </span><u></u>=
<u></u></pre>
<p class=3D"MsoNormal" style=3D"margin-left:108pt">
<span style=3D"font-size:10pt;font-family:Consolas">=E2=80=A6</span><u></u>=
<u></u></p>
<pre style=3D"margin-left:108pt"><span style=3D"color:black">=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 Assuming a redundancy group of N PE nodes, for VLAN-base=
d service,</span><u></u><u></u></pre>
<pre style=3D"margin-left:108pt"><span style=3D"color:black">=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 the PE with ordinal i is the DF for an &lt;ES, VLAN V&gt=
; when (V mod N)</span><u></u><u></u></pre>
<pre style=3D"margin-left:108pt"><span style=3D"color:black">=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 =3D i.=C2=A0 In the case of VLAN-(aware) bundle service,=
 then the</span><u></u><u></u></pre>
<pre style=3D"margin-left:108pt"><span style=3D"color:black">=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 numerically lowest VLAN value in that bundle on that ES =
MUST be</span><u></u><u></u></pre>
<pre style=3D"margin-left:108pt"><span style=3D"color:black">=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 used in the modulo function.</span><u></u><u></u></pre>
<p class=3D"MsoNormal" style=3D"margin-left:108pt">
<span style=3D"font-size:10pt;font-family:Consolas">=E2=80=A6</span><u></u>=
<u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:108pt">
<span style=3D"font-size:10pt;font-family:Consolas">=3D=3D=3D=3D=3D=3D=3D=
=3D=3D&lt;snip end&gt;=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=
=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D=3D</span><u></=
u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:108pt">
<span style=3D"font-size:10pt;font-family:Consolas">=C2=A0</span><u></u><u>=
</u></p>
<p class=3D"MsoNormal" style=3D"margin-left:108pt">
<span style=3D"font-size:10pt;font-family:Verdana,serif">Thanks &amp; Regar=
ds</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:108pt">
<span style=3D"font-size:10pt;font-family:Verdana,serif">Jaikumar S</span><=
u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:108pt">
=C2=A0<u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:72pt">
_______________________________________________<br>
BESS mailing list<br>
<a href=3D"mailto:BESS@ietf.org" target=3D"_blank">BESS@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/bess" target=3D"_blank">ht=
tps://www.ietf.org/mailman/listinfo/bess</a><u></u><u></u></p>
</blockquote>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</div>

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

--000000000000fc6441058612d076--


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From: Benjamin Kaduk via Datatracker <noreply@ietf.org>
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Cc: draft-ietf-bess-bgp-vpls-control-flags@ietf.org, Mach Chen <mach.chen@huawei.com>, bess-chairs@ietf.org, mach.chen@huawei.com,  bess@ietf.org
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Subject: [bess] Benjamin Kaduk's No Objection on draft-ietf-bess-bgp-vpls-control-flags-07: (with COMMENT)
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Benjamin Kaduk has entered the following ballot position for
draft-ietf-bess-bgp-vpls-control-flags-07: No Objection

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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

Thanks for this document; it's good to get this behavior clarified and made
more usable.

Unfortunately, I cannot agree with the "no new security considerations"
statement in Section 7.  I wavered for a while on whether to make this a
DISCUSS-level point, but decided not to since I don't think the material
consequences are especially severe.  Please take it under consideration,
though.

It seems to me that we are changing the expected tradeoff
between availability and functionality, and that change should be
documented as a new consideration.  Specifically, the state prior to
this document (in practice) seems to be that when a PE advertises the
C-bit in its NLRI, all PWs in both directions that use that NLRI will
use the CW, or will fail.  Any transient error, random bit flip,
attacker-induced bit flip, etc., would cause a PW failure which is
presumably highly visible.  Using the recommendations in this document,
we prioritize availability over using the CW feature, so those
errors/bit-flips now cause the PW to be established but not use the CW,
which may be a less visible event and have second-order effects for the
traffic therein.  The operator deploying this technology should make an
informed decision about its usage.

(We are also changing the behavior of the S bit so there would be
some considerations there, too, though failure to agree on the S bit
still results in a highly visible outage, so the considerations are a
little different.)

Some other, more minor, section-by-section comments follow.

Section 1

["PE" is not listed as "well-known" at
https://www.rfc-editor.org/materials/abbrev.expansion.txt and thus would
normally be a candidate for expansion on first use]

   The use of the Control Word (CW) helps prevent mis-ordering of IPv4
   or IPv6 Psuedo-Wire (PW) traffic over Equal Cost Multi-Path (ECMP)
   paths or Link Aggregation Group (LAG) bundles. [RFC4385] describes
   the format for CW that may be used over Point-to-Point PWs and over a
   VPLS. Along with [RFC3985], the document also describes sequence
   number usage for VPLS frames.

RFC 4385 seems to be carrying fairly generic disucssion, to me, without
a clear statement that that CW format should be used for p2p PWs and
VPLS usage.  (Though, I cannot dispute the "that may be used" statement,
since the intent of 4385 seems to be quite generic.)  Perhaps it is more
accurate to say "a format" than "the format", though, absent some other
specification that mandates this particular one?

Section 3.1

This new behavior means that any fault (or attacker influence) causes
the PW to degrade to not using the CW, and possibly to do so "silently".
In other contexts this sort of fallback would get harsh review from the
security community, though it's unclear that the risk/reward here merits
a harsh response.

Section 3.2

   send outgoing frames with sequence numbers as well.  This memo
   further specifies the expected behavior. [...]

I would prefer to see an explicit statement of the semantics of (not)
setting the S-bit, as given by this specification.  (That is, the
previous section says "If a PE sets the C-bit in its NLRI, [...]" but we
don't have a similarly declarative statement for the S bit.)
Note, however, that this is the non-blocking COMMENT portion of the
ballot and I am not trying to impose my preference on you.

Do we need to say that if both PEs send a S-bit of 0, sequence numbers
MUST NOT be used?

I a little bit expected to see some text about why CW usage and
sequencing are sufficiently different so as to get differential
treatment for mismatched advertisement, but perhaps it is not really
necessary for a document of this nature.

Section 5

[VPLS-MULTIHOMING] is not yet in IESG processing; would it make sense to
move this content into that document?

Section 5.2

     The PW behavior is similar to the CW scenario so that the insertion
     of S-bit evaluation SHOULD be independent per PW.  However, because

nit: I think this would be a lot clearer if it was "The PW behavior with
respect to sequencing is similar to the CW scenario".  (But maybe that's
just because my brain is still parsing PW and CW as visually similar and
trying to make them be semantically similar, even though they are not.)

     one PW would be established, between PE1 and PE2.  Thus, even
     though CE5 is physically multi-homed, due to PE4's lack of support
     for S-bit, and no PW between PE1 and PE4, CE5 would not be multi-
     homed.

nit: I think the relevant attribute is the lack of support for
*sequencing* (which is indicated via the S-bit), rather than "lack of
support for S-bit" itself.

Section 6

   Let PE2 and PE3 also be CW enabled. Let PE4 not be CW enabled. PE1
   will advertise a VPLS BGP NLRI, containing the C/S bits marked as 1.
   PE2 and PE3 on learning of NLRI from PE1, will include the CW in VPLS
   frames being forwarded to PE1. However, PE4 which does not have the
   ability to include CW, will not.

This text seems to be written to the letter of RFC 4761 excluding the
modifications made by this document (i.e., advertising NLRI leads to
peers setting those bits for traffic to the indicated PE, without any
negotiation).

Do we want any discussion of the sequencing behaviors and S-bit settings
for this example?



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--=====_003_next=====--

--=====_002_next=====--

--=====_001_next=====--


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Suresh Krishnan has entered the following ballot position for
draft-ietf-bess-bgp-vpls-control-flags-07: No Objection

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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------

* Section 6

I think this network diagram would be useful in understanding Section 5 and
should be moved before the discussions in Section 5.

* Section 5.2

"and no PW between PE1 and PE4"

Shouldn't this be

"and no PW between PE2 and PE4"

as the draft was discussing multihomed connectivity from PE2 towards A5.



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From: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>
To: "wang.yubao2@zte.com.cn" <wang.yubao2@zte.com.cn>
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Thread-Topic: [bess] [ALU]  Some questions about PBB EVPN (RFC7623)
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Subject: Re: [bess] [ALU]  Some questions about PBB EVPN (RFC7623)
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From: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>
To: "wang.yubao2@zte.com.cn" <wang.yubao2@zte.com.cn>
CC: "bess@ietf.org" <bess@ietf.org>, "sajassi@cisco.com" <sajassi@cisco.com>,  "jdrake@juniper.net" <jdrake@juniper.net>
Thread-Topic: [BESS] Discussions about DF-election FSM.
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Date: Sat, 13 Apr 2019 21:58:30 +0000
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Subject: Re: [bess] [BESS] Discussions about DF-election FSM.
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From: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
Date: Wed, 17 Apr 2019 11:39:23 +0530
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Subject: [bess] =?utf-8?q?=E2=80=8BQuestion_on_EVPN_Default_Gateway_MAC_A?= =?utf-8?q?ddress_Aliasing?=
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--000000000000c3b5b20586b3ba10
Content-Type: text/plain; charset="UTF-8"

Section 10.1 of RFC7432 describes the MAC address aliasing procedure. It
describes how a PE that acts as a default gateway advertises the default
gateway MAC address using the MAC/IP route together with the Default
Gateway EC. It says that:

   - The IP Address field of the MAC/IP route is set to the default gateway
   IP address.
   - The ESI field is set to 0.
   - MPLS label is set to a downstream assigned label.

It however does not say anything about MPLS Label2 (neither
does draft-ietf-bess-evpn-inter-subnet-forwarding). I think MPLS Label2
does not serve any purpose here since the receiver is not expected to
import the IP address into its IP-VRF as it is the default gateway
anycast IP address.

However, I think the MAC/IP route should be advertised with both the
MAC-VRF and IP-VRF RTs to enable the receiving PE to check its configured
default gateway IP address against the one received in the MAC/IP route and
log an should there be a discrepancy.

Is my understanding correct?

Does this clarification belong to RFC7432bis or
bess-evpn-inter-subnet-forwarding?

Regards,
Muthu

--000000000000c3b5b20586b3ba10
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div cl=
ass=3D"gmail_default">Section 10.1 of RFC7432 describes the MAC address ali=
asing procedure. It describes how a PE that acts as a default gateway adver=
tises the default gateway MAC address using the MAC/IP route together with =
the Default Gateway EC. It says that:</div><div class=3D"gmail_default"><ul=
><li>The IP Address field of the MAC/IP route is set to the default gateway=
 IP address.</li><li>The ESI field is set to 0.</li><li>MPLS label is set t=
o a downstream assigned label.</li></ul></div><div class=3D"gmail_default">=
It however does not say anything about MPLS Label2 (neither does=C2=A0draft=
-ietf-bess-evpn-inter-subnet-forwarding). I think MPLS Label2 does not serv=
e any purpose here since the receiver is not expected to import the IP addr=
ess into its IP-VRF as it is the default gateway anycast=C2=A0IP address.=
=C2=A0<br></div><div class=3D"gmail_default"><br></div><div class=3D"gmail_=
default">However, I think the MAC/IP route should be advertised with both t=
he MAC-VRF and IP-VRF RTs to enable the receiving PE to check its configure=
d default gateway IP address against the one received in the MAC/IP route a=
nd log an should there be a discrepancy.</div><div class=3D"gmail_default">=
<br></div><div class=3D"gmail_default">Is my understanding correct?</div><d=
iv class=3D"gmail_default"><br></div><div class=3D"gmail_default">Does this=
 clarification belong to RFC7432bis or bess-evpn-inter-subnet-forwarding?</=
div><div class=3D"gmail_default"><br></div><div class=3D"gmail_default">Reg=
ards,</div><div class=3D"gmail_default">Muthu</div><div class=3D"gmail_defa=
ult"><br></div><div class=3D"gmail_default"><br></div></div></div></div></d=
iv>

--000000000000c3b5b20586b3ba10--


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Subject: [bess] I-D Action: draft-ietf-bess-bgp-vpls-control-flags-08.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the BGP Enabled ServiceS WG of the IETF.

        Title           : Updated processing of Control Flags for BGP VPLS
        Authors         : Ravi Singh
                          Kireeti Kompella
                          Senad Palislamovic
	Filename        : draft-ietf-bess-bgp-vpls-control-flags-08.txt
	Pages           : 9
	Date            : 2019-04-19

Abstract:
   This document updates the meaning of the Control Flags field in the
   Layer2 Info Extended Community used for BGP-VPLS NLRI as defined in
   RFC4761. This document updates RFC4761.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-bess-bgp-vpls-control-flags/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-bess-bgp-vpls-control-flags-08
https://datatracker.ietf.org/doc/html/draft-ietf-bess-bgp-vpls-control-flags-08

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-bess-bgp-vpls-control-flags-08


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

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


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From: Ravi Singh <ravis@juniper.net>
To: Benjamin Kaduk <kaduk@mit.edu>, The IESG <iesg@ietf.org>
CC: "draft-ietf-bess-bgp-vpls-control-flags@ietf.org" <draft-ietf-bess-bgp-vpls-control-flags@ietf.org>, Mach Chen <mach.chen@huawei.com>, "bess-chairs@ietf.org" <bess-chairs@ietf.org>, "bess@ietf.org" <bess@ietf.org>
Thread-Topic: Benjamin Kaduk's No Objection on draft-ietf-bess-bgp-vpls-control-flags-07: (with COMMENT)
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Subject: Re: [bess] Benjamin Kaduk's No Objection on draft-ietf-bess-bgp-vpls-control-flags-07: (with COMMENT)
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To: Jouni Korhonen <jouni.nospam@gmail.com>, "ops-dir@ietf.org" <ops-dir@ietf.org>
CC: "ietf@ietf.org" <ietf@ietf.org>, "draft-ietf-bess-bgp-vpls-control-flags.all@ietf.org" <draft-ietf-bess-bgp-vpls-control-flags.all@ietf.org>, "bess@ietf.org" <bess@ietf.org>
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From: Ravi Singh <ravis@juniper.net>
To: =?utf-8?B?TWlyamEgS8O8aGxld2luZA==?= <ietf@kuehlewind.net>, The IESG <iesg@ietf.org>
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From: Ravi Singh <ravis@juniper.net>
To: Roman Danyliw <rdd@cert.org>, The IESG <iesg@ietf.org>
CC: "draft-ietf-bess-bgp-vpls-control-flags@ietf.org" <draft-ietf-bess-bgp-vpls-control-flags@ietf.org>, Mach Chen <mach.chen@huawei.com>, "bess-chairs@ietf.org" <bess-chairs@ietf.org>, "bess@ietf.org" <bess@ietf.org>
Thread-Topic: Roman Danyliw's No Objection on draft-ietf-bess-bgp-vpls-control-flags-07: (with COMMENT)
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/KG-cuTqfrT-FW2wAXYqMrN5LK7Q>
Subject: Re: [bess] Roman Danyliw's No Objection on draft-ietf-bess-bgp-vpls-control-flags-07: (with COMMENT)
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From: Ravi Singh <ravis@juniper.net>
To: Barry Leiba <barryleiba@computer.org>, The IESG <iesg@ietf.org>
CC: "draft-ietf-bess-bgp-vpls-control-flags@ietf.org" <draft-ietf-bess-bgp-vpls-control-flags@ietf.org>, Mach Chen <mach.chen@huawei.com>, "bess@ietf.org" <bess@ietf.org>
Thread-Topic: Barry Leiba's No Objection on draft-ietf-bess-bgp-vpls-control-flags-07: (with COMMENT)
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/BoW3vuYkFLxtIsf9NryZ4-meWD4>
Subject: Re: [bess] Barry Leiba's No Objection on draft-ietf-bess-bgp-vpls-control-flags-07: (with COMMENT)
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From: Ravi Singh <ravis@juniper.net>
To: =?utf-8?B?w4lyaWMgVnluY2tl?= <evyncke@cisco.com>, The IESG <iesg@ietf.org>
CC: "draft-ietf-bess-bgp-vpls-control-flags@ietf.org" <draft-ietf-bess-bgp-vpls-control-flags@ietf.org>, Mach Chen <mach.chen@huawei.com>, "bess-chairs@ietf.org" <bess-chairs@ietf.org>, "bess@ietf.org" <bess@ietf.org>
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From: Ravi Singh <ravis@juniper.net>
To: Suresh Krishnan <suresh@kaloom.com>, The IESG <iesg@ietf.org>
CC: "draft-ietf-bess-bgp-vpls-control-flags@ietf.org" <draft-ietf-bess-bgp-vpls-control-flags@ietf.org>, Mach Chen <mach.chen@huawei.com>, "bess-chairs@ietf.org" <bess-chairs@ietf.org>, "bess@ietf.org" <bess@ietf.org>
Thread-Topic: Suresh Krishnan's No Objection on draft-ietf-bess-bgp-vpls-control-flags-07: (with COMMENT)
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Subject: Re: [bess] Suresh Krishnan's No Objection on draft-ietf-bess-bgp-vpls-control-flags-07: (with COMMENT)
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From: Krzysztof Szarkowicz <kszarkowicz@gmail.com>
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Hi,

Would like to add as well one comment, regarding section 4, which says:

For Modulo calculation, byte 10 of the ESI is used.

This is too restrictive, since in essence it means, to achieve the =
desired diversity, operator would need to use ESI byte 10 for ESI =
differentiation. Given the fact, ES-Import RT community inherits from =
ESI only byte 1-7, many deployments differentiate ESI within these bytes =
only. So, byte 10 stays the same in many deployments (typically =
=E2=80=9900=E2=80=99).=20

Therefore, modulo calculation should take into account entire ESI (bytes =
2-10, omitting byte 1, which defines ESI type). Or, some sort of =
hash/CRC function should be calculated over ESI bytes 2-10, quasi =
compressing 9 bytes to 1 byte (=3D result of hash/CRC), and this 1 byte =
should be taken as input for modulo calculations.

Thanks,
Krzysztof




> On 2018-Nov-05, at 10:44, Rabadan, Jorge (Nokia - US/Mountain View) =
<jorge.rabadan@nokia.com> wrote:
>=20
> Hi all,
>=20
> I think I already made similar comments when the first revision of the =
draft in the subject was presented, but since I see no changes in the =
last revision, please let me throw the comments to the list for =
discussion:
>=20
> 1) section 3
> "Peering PEs MAY exchange only Ethernet-Segment route (Route Type-4)"
> Note that the AD per-ES route is REQUIRED in RFC7432. Please don't =
make this solution non-backwards compatible. Besides, mass withdrawal is =
important in this solution.
>=20
> 2) section 4
> The document only talks about the default Alg and HRW Alg, but other =
Algs such as Preference make a lot of sense here too.
> Also, shouldn't you request a new capability in the DF Election EC =
capability registry? If so, IMO this could be done:
> - the ES routes are advertised with existing DF Algs, e.g., default, =
HRW, Pref
> - when the new capability "port-based" is signaled, the Alg should be =
modified to consider the port only and not the Ethernet Tags.
> - the "port-based" capability should be compatible with the 'DP' =
capability (for non-revertive) and you should make sure that the AC-DF =
bit is zero so that an AC going down does not influence the DF Election.
>=20
> 3) I assume the ES associated to the port is defined as single-active =
mode. Also, as in RFC7432, the ESI-label based split-horizon procedures =
should be used to avoid transient echo'ed packets.
>=20
> 4) section 5 - Port-active over Integrated Routing-Bridging Interface
> In this section you assume that the entire port belongs to a single =
BD, and there are no other ACs in the BD. Without this assumption you =
cannot drive the IRB state out of the ES state. Please let me know if I =
am missing something, otherwise please, make this explicit.
>=20
> Thank you.
> Jorge
>=20
> _______________________________________________
> BESS mailing list
> BESS@ietf.org
> https://www.ietf.org/mailman/listinfo/bess


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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" =
class=3D"">Hi,<div class=3D""><br class=3D""></div><div class=3D"">Would =
like to add as well one comment, regarding section 4, which =
says:</div><div class=3D""><br class=3D""></div><div class=3D""><div =
class=3D""><i class=3D"">For Modulo calculation, byte 10 of the ESI is =
used.</i></div></div><div class=3D""><br class=3D""></div><div =
class=3D"">This is too restrictive, since in essence it means, to =
achieve the desired diversity, operator would need to use ESI byte 10 =
for ESI differentiation. Given the fact,&nbsp;ES-Import RT community =
inherits from ESI only byte 1-7, many deployments differentiate ESI =
within these bytes only. So, byte 10 stays the same in many deployments =
(typically =E2=80=9900=E2=80=99).&nbsp;</div><div class=3D""><br =
class=3D""></div><div class=3D"">Therefore, modulo calculation should =
take into account entire ESI (bytes 2-10, omitting byte 1, which defines =
ESI type). Or, some sort of hash/CRC function should be calculated over =
ESI bytes 2-10, quasi compressing 9 bytes to 1 byte (=3D result of =
hash/CRC), and this 1 byte should be taken as input for modulo =
calculations.</div><div class=3D""><br class=3D""></div><div =
class=3D"">Thanks,</div><div class=3D"">Krzysztof</div><div class=3D""><br=
 class=3D""></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"">On 2018-Nov-05, at 10:44, Rabadan, Jorge (Nokia - US/Mountain =
View) &lt;<a href=3D"mailto:jorge.rabadan@nokia.com" =
class=3D"">jorge.rabadan@nokia.com</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div class=3D"">Hi =
all,<br class=3D""><br class=3D"">I think I already made similar =
comments when the first revision of the draft in the subject was =
presented, but since I see no changes in the last revision, please let =
me throw the comments to the list for discussion:<br class=3D""><br =
class=3D"">1) section 3<br class=3D"">"Peering PEs MAY exchange only =
Ethernet-Segment route (Route Type-4)"<br class=3D"">Note that the AD =
per-ES route is REQUIRED in RFC7432. Please don't make this solution =
non-backwards compatible. Besides, mass withdrawal is important in this =
solution.<br class=3D""><br class=3D"">2) section 4<br class=3D"">The =
document only talks about the default Alg and HRW Alg, but other Algs =
such as Preference make a lot of sense here too.<br class=3D"">Also, =
shouldn't you request a new capability in the DF Election EC capability =
registry? If so, IMO this could be done:<br class=3D"">- the ES routes =
are advertised with existing DF Algs, e.g., default, HRW, Pref<br =
class=3D"">- when the new capability "port-based" is signaled, the Alg =
should be modified to consider the port only and not the Ethernet =
Tags.<br class=3D"">- the "port-based" capability should be compatible =
with the 'DP' capability (for non-revertive) and you should make sure =
that the AC-DF bit is zero so that an AC going down does not influence =
the DF Election.<br class=3D""><br class=3D"">3) I assume the ES =
associated to the port is defined as single-active mode. Also, as in =
RFC7432, the ESI-label based split-horizon procedures should be used to =
avoid transient echo'ed packets.<br class=3D""><br class=3D"">4) section =
5 - Port-active over Integrated Routing-Bridging Interface<br =
class=3D"">In this section you assume that the entire port belongs to a =
single BD, and there are no other ACs in the BD. Without this assumption =
you cannot drive the IRB state out of the ES state. Please let me know =
if I am missing something, otherwise please, make this explicit.<br =
class=3D""><br class=3D"">Thank you.<br class=3D"">Jorge<br class=3D""><br=
 class=3D"">_______________________________________________<br =
class=3D"">BESS mailing list<br class=3D""><a =
href=3D"mailto:BESS@ietf.org" class=3D"">BESS@ietf.org</a><br =
class=3D"">https://www.ietf.org/mailman/listinfo/bess<br =
class=3D""></div></div></blockquote></div><br =
class=3D""></div></body></html>=

--Apple-Mail=_2085CE70-74DF-43AC-8BFA-866873C09A0F--


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CC: The IESG <iesg@ietf.org>, "draft-ietf-bess-bgp-vpls-control-flags@ietf.org" <draft-ietf-bess-bgp-vpls-control-flags@ietf.org>, Mach Chen <mach.chen@huawei.com>, "bess-chairs@ietf.org" <bess-chairs@ietf.org>, "bess@ietf.org" <bess@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/1hVWo47b5XikjrXHjBIuVRi2F-o>
Subject: Re: [bess] Suresh Krishnan's No Objection on draft-ietf-bess-bgp-vpls-control-flags-07: (with COMMENT)
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> On Apr 19, 2019, at 10:09 PM, Ravi Singh <ravis@juniper.net> wrote:
>=20
> Hi Suresh
> I've incorporated your suggestions.
> Good catch with the PE#.

Thanks Ravi.

Regards
Suresh


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Subject: Re: [bess] About draft-brissette-bess-evpn-mh-pa-02
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Hi,

I agree w/ both Jorge and Krzysztof.  All we need is a new DF Election capa=
bility, port active load balancing, and a description of how each of the de=
fined DF elections is modified.  For HRW, RFC 8584 already describes comput=
ing a 32 bit CRC over the concatenation of Ethernet Tag and ESI so we would=
 simply remove the Ethernet Tag from the CRC computation.

Yours Irrespectively,

John



Juniper Internal
From: BESS <bess-bounces@ietf.org> On Behalf Of Krzysztof Szarkowicz
Sent: Saturday, April 20, 2019 4:35 AM
To: draft-brissette-bess-evpn-mh-pa.authors@ietf.org
Cc: bess@ietf.org
Subject: Re: [bess] About draft-brissette-bess-evpn-mh-pa-02

Hi,

Would like to add as well one comment, regarding section 4, which says:

For Modulo calculation, byte 10 of the ESI is used.

This is too restrictive, since in essence it means, to achieve the desired =
diversity, operator would need to use ESI byte 10 for ESI differentiation. =
Given the fact, ES-Import RT community inherits from ESI only byte 1-7, man=
y deployments differentiate ESI within these bytes only. So, byte 10 stays =
the same in many deployments (typically '00').

Therefore, modulo calculation should take into account entire ESI (bytes 2-=
10, omitting byte 1, which defines ESI type). Or, some sort of hash/CRC fun=
ction should be calculated over ESI bytes 2-10, quasi compressing 9 bytes t=
o 1 byte (=3D result of hash/CRC), and this 1 byte should be taken as input=
 for modulo calculations.

Thanks,
Krzysztof




On 2018-Nov-05, at 10:44, Rabadan, Jorge (Nokia - US/Mountain View) <jorge.=
rabadan@nokia.com<mailto:jorge.rabadan@nokia.com>> wrote:

Hi all,

I think I already made similar comments when the first revision of the draf=
t in the subject was presented, but since I see no changes in the last revi=
sion, please let me throw the comments to the list for discussion:

1) section 3
"Peering PEs MAY exchange only Ethernet-Segment route (Route Type-4)"
Note that the AD per-ES route is REQUIRED in RFC7432. Please don't make thi=
s solution non-backwards compatible. Besides, mass withdrawal is important =
in this solution.

2) section 4
The document only talks about the default Alg and HRW Alg, but other Algs s=
uch as Preference make a lot of sense here too.
Also, shouldn't you request a new capability in the DF Election EC capabili=
ty registry? If so, IMO this could be done:
- the ES routes are advertised with existing DF Algs, e.g., default, HRW, P=
ref
- when the new capability "port-based" is signaled, the Alg should be modif=
ied to consider the port only and not the Ethernet Tags.
- the "port-based" capability should be compatible with the 'DP' capability=
 (for non-revertive) and you should make sure that the AC-DF bit is zero so=
 that an AC going down does not influence the DF Election.

3) I assume the ES associated to the port is defined as single-active mode.=
 Also, as in RFC7432, the ESI-label based split-horizon procedures should b=
e used to avoid transient echo'ed packets.

4) section 5 - Port-active over Integrated Routing-Bridging Interface
In this section you assume that the entire port belongs to a single BD, and=
 there are no other ACs in the BD. Without this assumption you cannot drive=
 the IRB state out of the ES state. Please let me know if I am missing some=
thing, otherwise please, make this explicit.

Thank you.
Jorge

_______________________________________________
BESS mailing list
BESS@ietf.org<mailto:BESS@ietf.org>
https://www.ietf.org/mailman/listinfo/bess


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<p class=3D"MsoNormal">Hi,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I agree w/ both Jorge and Krzysztof.&nbsp; All we ne=
ed is a new DF Election capability, port active load balancing, and a descr=
iption of how each of the defined DF elections is modified.&nbsp; For HRW, =
RFC 8584 already describes computing a 32 bit
 CRC over the concatenation of Ethernet Tag and ESI so we would simply remo=
ve the Ethernet Tag from the CRC computation.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal">Yours Irrespectively,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">John<o:p></o:p></p>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
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<span style=3D"font-size:10.0pt;color:#737373">Juniper Internal</span><o:p>=
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<p class=3D"MsoNormal"><b>From:</b> BESS &lt;bess-bounces@ietf.org&gt; <b>O=
n Behalf Of </b>
Krzysztof Szarkowicz<br>
<b>Sent:</b> Saturday, April 20, 2019 4:35 AM<br>
<b>To:</b> draft-brissette-bess-evpn-mh-pa.authors@ietf.org<br>
<b>Cc:</b> bess@ietf.org<br>
<b>Subject:</b> Re: [bess] About draft-brissette-bess-evpn-mh-pa-02<o:p></o=
:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Hi,<o:p></o:p></p>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Would like to add as well one comment, regarding sec=
tion 4, which says:<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<div>
<p class=3D"MsoNormal"><i>For Modulo calculation, byte 10 of the ESI is use=
d.</i><o:p></o:p></p>
</div>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">This is too restrictive, since in essence it means, =
to achieve the desired diversity, operator would need to use ESI byte 10 fo=
r ESI differentiation. Given the fact,&nbsp;ES-Import RT community inherits=
 from ESI only byte 1-7, many deployments
 differentiate ESI within these bytes only. So, byte 10 stays the same in m=
any deployments (typically &#8217;00&#8217;).&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Therefore, modulo calculation should take into accou=
nt entire ESI (bytes 2-10, omitting byte 1, which defines ESI type). Or, so=
me sort of hash/CRC function should be calculated over ESI bytes 2-10, quas=
i compressing 9 bytes to 1 byte (=3D
 result of hash/CRC), and this 1 byte should be taken as input for modulo c=
alculations.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Thanks,<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Krzysztof<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><o:p>&nbsp;</o:p></p>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal">On 2018-Nov-05, at 10:44, Rabadan, Jorge (Nokia - US=
/Mountain View) &lt;<a href=3D"mailto:jorge.rabadan@nokia.com">jorge.rabada=
n@nokia.com</a>&gt; wrote:<o:p></o:p></p>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div>
<p class=3D"MsoNormal">Hi all,<br>
<br>
I think I already made similar comments when the first revision of the draf=
t in the subject was presented, but since I see no changes in the last revi=
sion, please let me throw the comments to the list for discussion:<br>
<br>
1) section 3<br>
&quot;Peering PEs MAY exchange only Ethernet-Segment route (Route Type-4)&q=
uot;<br>
Note that the AD per-ES route is REQUIRED in RFC7432. Please don't make thi=
s solution non-backwards compatible. Besides, mass withdrawal is important =
in this solution.<br>
<br>
2) section 4<br>
The document only talks about the default Alg and HRW Alg, but other Algs s=
uch as Preference make a lot of sense here too.<br>
Also, shouldn't you request a new capability in the DF Election EC capabili=
ty registry? If so, IMO this could be done:<br>
- the ES routes are advertised with existing DF Algs, e.g., default, HRW, P=
ref<br>
- when the new capability &quot;port-based&quot; is signaled, the Alg shoul=
d be modified to consider the port only and not the Ethernet Tags.<br>
- the &quot;port-based&quot; capability should be compatible with the 'DP' =
capability (for non-revertive) and you should make sure that the AC-DF bit =
is zero so that an AC going down does not influence the DF Election.<br>
<br>
3) I assume the ES associated to the port is defined as single-active mode.=
 Also, as in RFC7432, the ESI-label based split-horizon procedures should b=
e used to avoid transient echo'ed packets.<br>
<br>
4) section 5 - Port-active over Integrated Routing-Bridging Interface<br>
In this section you assume that the entire port belongs to a single BD, and=
 there are no other ACs in the BD. Without this assumption you cannot drive=
 the IRB state out of the ES state. Please let me know if I am missing some=
thing, otherwise please, make this
 explicit.<br>
<br>
Thank you.<br>
Jorge<br>
<br>
_______________________________________________<br>
BESS mailing list<br>
<a href=3D"mailto:BESS@ietf.org">BESS@ietf.org</a><br>
<a href=3D"https://www.ietf.org/mailman/listinfo/bess">https://www.ietf.org=
/mailman/listinfo/bess</a><o:p></o:p></p>
</div>
</div>
</blockquote>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
</div>
</div>
</body>
</html>

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From: <stephane.litkowski@orange.com>
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Thread-Topic: [bess] Poll to progress draft-ietf-bess-nsh-bgp-controlplane without implementation
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From: Sudhin Jacob <sjacob@juniper.net>
To: "bmwg@ietf.org" <bmwg@ietf.org>, "bess@ietf.org" <bess@ietf.org>
Thread-Topic: bmwg Digest, Vol 175, Issue 1 (for draft-ietf-bmwg-evpntest )
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/nGIfP9dpwbA6H5_QHyE5dRrDIV0>
Subject: Re: [bess] bmwg Digest, Vol 175, Issue 1 (for draft-ietf-bmwg-evpntest )
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Hi All,

Could you please let me know if you have any comments for our draft. Kindly=
 share before WGLC  window expires before 30th April 2019. Kindly  share yo=
ur inputs.

Regards,
Sudhin

-----Original Message-----
From: bmwg <bmwg-bounces@ietf.org> On Behalf Of bmwg-request@ietf.org
Sent: Tuesday, April 16, 2019 10:46 PM
To: bmwg@ietf.org
Subject: bmwg Digest, Vol 175, Issue 1

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Today's Topics:

   1. Minutes and Action Items from IETF104 in Prague (Sarah B)
   2. 2nd WGLC for
      https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__datatracker.ie=
tf.org_doc_draft-2Dietf-2Dbmwg-2Devpntest&d=3DDwICAg&c=3DHAkYuh63rsuhr6Scbf=
h0UjBXeMK-ndb3voDTXcWzoCI&r=3D6467957JFOdmNjfKujkufIeAE-AdkLRewB-QhIU_Srw&m=
=3DWqezXoMX37n7yEmaVY8pe5Fnt2TybgTxK5uHg2oQzEA&s=3DbV9x2nxv2laPCxWR8IvbmIu4=
Ro0z6bcKG3MmQRJXgRw&e=3D (Sarah B)
   3. Re: 2nd WGLC for
      https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__datatracker.ie=
tf.org_doc_draft-2Dietf-2Dbmwg-2Devpntest&d=3DDwICAg&c=3DHAkYuh63rsuhr6Scbf=
h0UjBXeMK-ndb3voDTXcWzoCI&r=3D6467957JFOdmNjfKujkufIeAE-AdkLRewB-QhIU_Srw&m=
=3DWqezXoMX37n7yEmaVY8pe5Fnt2TybgTxK5uHg2oQzEA&s=3DbV9x2nxv2laPCxWR8IvbmIu4=
Ro0z6bcKG3MmQRJXgRw&e=3D (Sarah B)
   4. Re: Call for Adoption: Benchmarking Methodology for Network
      Security Device Performance (Sarah Banks)


----------------------------------------------------------------------

Message: 1
Date: Mon, 15 Apr 2019 12:26:49 -0700
From: Sarah B <sbanks@encrypted.net>
To: bmwg@ietf.org
Subject: [bmwg] Minutes and Action Items from IETF104 in Prague
Message-ID: <46F83EC2-E8AF-42D3-BC56-96CE60F49854@encrypted.net>
Content-Type: text/plain; charset=3D"us-ascii"

Hello BMWG,
     Below is the link to the IETF104 minutes from Prague. There are action=
 items for several of the drafts, including those of us who raised our hand=
s to read the drafts. Please read the drafts!

https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__datatracker.ietf.org=
_meeting_104_materials_minutes-2D104-2Dbmwg-2D00&d=3DDwICAg&c=3DHAkYuh63rsu=
hr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=3D6467957JFOdmNjfKujkufIeAE-AdkLRewB-QhI=
U_Srw&m=3DWqezXoMX37n7yEmaVY8pe5Fnt2TybgTxK5uHg2oQzEA&s=3DKeaXc8LVnNgEv_I7Y=
ekJCcJ01m65YpHlumDGS6SlcXs&e=3D <https://urldefense.proofpoint.com/v2/url?u=
=3Dhttps-3A__datatracker.ietf.org_meeting_104_materials_minutes-2D104-2Dbmw=
g-2D00&d=3DDwICAg&c=3DHAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=3D64679=
57JFOdmNjfKujkufIeAE-AdkLRewB-QhIU_Srw&m=3DWqezXoMX37n7yEmaVY8pe5Fnt2TybgTx=
K5uHg2oQzEA&s=3DKeaXc8LVnNgEv_I7YekJCcJ01m65YpHlumDGS6SlcXs&e=3D>


Thanks
Sarah

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------------------------------

Message: 2
Date: Mon, 15 Apr 2019 12:35:13 -0700
From: Sarah B <sbanks@encrypted.net>
To: bmwg@ietf.org
Subject: [bmwg] 2nd WGLC for
	https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__datatracker.ietf.or=
g_doc_draft-2Dietf-2Dbmwg-2Devpntest&d=3DDwICAg&c=3DHAkYuh63rsuhr6Scbfh0UjB=
XeMK-ndb3voDTXcWzoCI&r=3D6467957JFOdmNjfKujkufIeAE-AdkLRewB-QhIU_Srw&m=3DWq=
ezXoMX37n7yEmaVY8pe5Fnt2TybgTxK5uHg2oQzEA&s=3DbV9x2nxv2laPCxWR8IvbmIu4Ro0z6=
bcKG3MmQRJXgRw&e=3D
Message-ID: <E643E569-0239-4D06-8B0D-0943E51795A0@encrypted.net>
Content-Type: text/plain; charset=3D"us-ascii"

Hello,
	I'd sent this first wGLC for draft-ietf-bmwg-evpntest before Christmas, an=
d while I gave it a longer period of time for comments, we've received none=
. So, I'd like to send it through WGLC again, ending Tuesday, April 30. Ple=
ase share your comments and feedback here on the list.

Thanks
Sarah


> On Dec 7, 2018, at 9:59 AM, Sarah B <sbanks@encrypted.net> wrote:
>=20
> Hi BMWG,
> 	A quick clarification. The WGLC is for the Internet-Draft describing a b=
enchmarking methodology for EVPN and PBB-EVPN, NOT BGP Basic Convergence. M=
y apologies for the incorrect cut/paste. The draft link below is incorrect =
as well; data tracker no longer references full links with versions, so ple=
ase use:
>=20
> =09
> https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__datatracker.ietf.
> org_doc_draft-2Dietf-2Dbmwg-2Devpntest&d=3DDwICAg&c=3DHAkYuh63rsuhr6Scbfh=
0
> UjBXeMK-ndb3voDTXcWzoCI&r=3D6467957JFOdmNjfKujkufIeAE-AdkLRewB-QhIU_Srw&
> m=3DWqezXoMX37n7yEmaVY8pe5Fnt2TybgTxK5uHg2oQzEA&s=3DbV9x2nxv2laPCxWR8Ivbm=
I
> u4Ro0z6bcKG3MmQRJXgRw&e=3D=20
> <https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__datatracker.ietf
> .org_doc_draft-2Dietf-2Dbmwg-2Devpntest&d=3DDwICAg&c=3DHAkYuh63rsuhr6Scbf=
h
> 0UjBXeMK-ndb3voDTXcWzoCI&r=3D6467957JFOdmNjfKujkufIeAE-AdkLRewB-QhIU_Srw
> &m=3DWqezXoMX37n7yEmaVY8pe5Fnt2TybgTxK5uHg2oQzEA&s=3DbV9x2nxv2laPCxWR8Ivb=
m
> Iu4Ro0z6bcKG3MmQRJXgRw&e=3D>
>=20
> 	And note that the current version as of this email/time of writing is -0=
1.
>=20
> Thanks,
> Sarah
>=20
>> On Dec 7, 2018, at 9:45 AM, Sarah B <sbanks@encrypted.net <mailto:sbanks=
@encrypted.net>> wrote:
>>=20
>> Hello BMWG,
>> =09
>> 	A Working Group Last Call (WGLC) period for the Internet-Draft describi=
ng BGP Basic convergence:
>>=20
>> https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__datatracker.ietf
>> .org_doc_draft-2Dietf-2Dbmwg-2Devpntest-2D01&d=3DDwICAg&c=3DHAkYuh63rsuh=
r
>> 6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=3D6467957JFOdmNjfKujkufIeAE-AdkLRewB-Q
>> hIU_Srw&m=3DWqezXoMX37n7yEmaVY8pe5Fnt2TybgTxK5uHg2oQzEA&s=3DnfeWPM8c7Bow=
E
>> lTvG5Xekus4MecFwvNP6wCSpgInIHw&e=3D=20
>> <https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__datatracker.iet
>> f.org_doc_draft-2Dietf-2Dbmwg-2Devpntest-2D01&d=3DDwICAg&c=3DHAkYuh63rsu=
h
>> r6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=3D6467957JFOdmNjfKujkufIeAE-AdkLRewB-
>> QhIU_Srw&m=3DWqezXoMX37n7yEmaVY8pe5Fnt2TybgTxK5uHg2oQzEA&s=3DnfeWPM8c7Bo=
w
>> ElTvG5Xekus4MecFwvNP6wCSpgInIHw&e=3D>
>>=20
>> will be open for 6 weeks from today, and close on January 18, 2019. This=
 is a bit longer of a WGLC window, but accommodates the end of year interru=
ptions some members might experience.  Please weigh in on whether or not yo=
u feel that this Internet-Draft should be given to the Area Directors for c=
onsideration to progressing as an Informational RFC. Send your comments to =
this list. Your timely and prompt review and feedback is greatly appreciate=
d!
>>=20
>> Kind regards,
>> Sarah/Al
>> BMWG co-chairs
>> _______________________________________________
>> bmwg mailing list
>> bmwg@ietf.org
>> https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__www.ietf.org_mai
>> lman_listinfo_bmwg&d=3DDwICAg&c=3DHAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXc=
W
>> zoCI&r=3D6467957JFOdmNjfKujkufIeAE-AdkLRewB-QhIU_Srw&m=3DWqezXoMX37n7yEm=
a
>> VY8pe5Fnt2TybgTxK5uHg2oQzEA&s=3DIddAo-k1s8K5UPuVP-_Mm3KDrTJg4AwAYS3O_-A
>> jiyE&e=3D
>=20
> _______________________________________________
> bmwg mailing list
> bmwg@ietf.org
> https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__www.ietf.org_mail
> man_listinfo_bmwg&d=3DDwICAg&c=3DHAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWz=
o
> CI&r=3D6467957JFOdmNjfKujkufIeAE-AdkLRewB-QhIU_Srw&m=3DWqezXoMX37n7yEmaVY=
8
> pe5Fnt2TybgTxK5uHg2oQzEA&s=3DIddAo-k1s8K5UPuVP-_Mm3KDrTJg4AwAYS3O_-AjiyE
> &e=3D

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------------------------------

Message: 3
Date: Mon, 15 Apr 2019 12:38:23 -0700
From: Sarah B <sbanks@encrypted.net>
To: bmwg@ietf.org
Subject: Re: [bmwg] 2nd WGLC for
	https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__datatracker.ietf.or=
g_doc_draft-2Dietf-2Dbmwg-2Devpntest&d=3DDwICAg&c=3DHAkYuh63rsuhr6Scbfh0UjB=
XeMK-ndb3voDTXcWzoCI&r=3D6467957JFOdmNjfKujkufIeAE-AdkLRewB-QhIU_Srw&m=3DWq=
ezXoMX37n7yEmaVY8pe5Fnt2TybgTxK5uHg2oQzEA&s=3DbV9x2nxv2laPCxWR8IvbmIu4Ro0z6=
bcKG3MmQRJXgRw&e=3D
Message-ID: <BACC8C2D-2733-4D33-9B87-31D344D2EFD7@encrypted.net>
Content-Type: text/plain; charset=3D"us-ascii"

Hi,
	(with my participant hat on)
=09
	Authors, I have a concern with this draft moving forward, in light of 2 ot=
her proposals coming in. It's not that I object to the content of the draft=
 per se, but rather, I think some consolidation could happen.
	First, it appears that you, the authors, have a second, separate draft, co=
vering Multicast. I'm wondering if that can fit in here. Also, a few folks =
from AT&T submitted what appears to be a complementary (to this one) draft =
that makes me think that we'd be better served with consolidation here. I'd=
 like to ask both the authors of this draft, and Al/Jim, to discuss and see=
 if unification makes sense.

Thanks
Sarah (with participant hat on!!)

> On Apr 15, 2019, at 12:35 PM, Sarah B <sbanks@encrypted.net> wrote:
>=20
> Hello,
> 	I'd sent this first wGLC for draft-ietf-bmwg-evpntest before Christmas, =
and while I gave it a longer period of time for comments, we've received no=
ne. So, I'd like to send it through WGLC again, ending Tuesday, April 30. P=
lease share your comments and feedback here on the list.
>=20
> Thanks
> Sarah
>=20
>=20
>> On Dec 7, 2018, at 9:59 AM, Sarah B <sbanks@encrypted.net <mailto:sbanks=
@encrypted.net>> wrote:
>>=20
>> Hi BMWG,
>> 	A quick clarification. The WGLC is for the Internet-Draft describing a =
benchmarking methodology for EVPN and PBB-EVPN, NOT BGP Basic Convergence. =
My apologies for the incorrect cut/paste. The draft link below is incorrect=
 as well; data tracker no longer references full links with versions, so pl=
ease use:
>>=20
>> =09
>> https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__datatracker.ietf
>> .org_doc_draft-2Dietf-2Dbmwg-2Devpntest&d=3DDwICAg&c=3DHAkYuh63rsuhr6Scb=
f
>> h0UjBXeMK-ndb3voDTXcWzoCI&r=3D6467957JFOdmNjfKujkufIeAE-AdkLRewB-QhIU_S
>> rw&m=3DWqezXoMX37n7yEmaVY8pe5Fnt2TybgTxK5uHg2oQzEA&s=3DbV9x2nxv2laPCxWR8=
I
>> vbmIu4Ro0z6bcKG3MmQRJXgRw&e=3D=20
>> <https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__datatracker.iet
>> f.org_doc_draft-2Dietf-2Dbmwg-2Devpntest&d=3DDwICAg&c=3DHAkYuh63rsuhr6Sc=
b
>> fh0UjBXeMK-ndb3voDTXcWzoCI&r=3D6467957JFOdmNjfKujkufIeAE-AdkLRewB-QhIU_
>> Srw&m=3DWqezXoMX37n7yEmaVY8pe5Fnt2TybgTxK5uHg2oQzEA&s=3DbV9x2nxv2laPCxWR=
8
>> IvbmIu4Ro0z6bcKG3MmQRJXgRw&e=3D>
>>=20
>> 	And note that the current version as of this email/time of writing is -=
01.
>>=20
>> Thanks,
>> Sarah
>>=20
>>> On Dec 7, 2018, at 9:45 AM, Sarah B <sbanks@encrypted.net <mailto:sbank=
s@encrypted.net>> wrote:
>>>=20
>>> Hello BMWG,
>>> =09
>>> 	A Working Group Last Call (WGLC) period for the Internet-Draft describ=
ing BGP Basic convergence:
>>>=20
>>> https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__datatracker.iet
>>> f.org_doc_draft-2Dietf-2Dbmwg-2Devpntest-2D01&d=3DDwICAg&c=3DHAkYuh63rs=
u
>>> hr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=3D6467957JFOdmNjfKujkufIeAE-AdkLRew
>>> B-QhIU_Srw&m=3DWqezXoMX37n7yEmaVY8pe5Fnt2TybgTxK5uHg2oQzEA&s=3DnfeWPM8c=
7
>>> BowElTvG5Xekus4MecFwvNP6wCSpgInIHw&e=3D=20
>>> <https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__datatracker.ie
>>> tf.org_doc_draft-2Dietf-2Dbmwg-2Devpntest-2D01&d=3DDwICAg&c=3DHAkYuh63r=
s
>>> uhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=3D6467957JFOdmNjfKujkufIeAE-AdkLRe
>>> wB-QhIU_Srw&m=3DWqezXoMX37n7yEmaVY8pe5Fnt2TybgTxK5uHg2oQzEA&s=3DnfeWPM8=
c
>>> 7BowElTvG5Xekus4MecFwvNP6wCSpgInIHw&e=3D>
>>>=20
>>> will be open for 6 weeks from today, and close on January 18, 2019. Thi=
s is a bit longer of a WGLC window, but accommodates the end of year interr=
uptions some members might experience.  Please weigh in on whether or not y=
ou feel that this Internet-Draft should be given to the Area Directors for =
consideration to progressing as an Informational RFC. Send your comments to=
 this list. Your timely and prompt review and feedback is greatly appreciat=
ed!
>>>=20
>>> Kind regards,
>>> Sarah/Al
>>> BMWG co-chairs
>>> _______________________________________________
>>> bmwg mailing list
>>> bmwg@ietf.org <mailto:bmwg@ietf.org>=20
>>> https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__www.ietf.org_ma
>>> ilman_listinfo_bmwg&d=3DDwICAg&c=3DHAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDT=
X
>>> cWzoCI&r=3D6467957JFOdmNjfKujkufIeAE-AdkLRewB-QhIU_Srw&m=3DWqezXoMX37n7=
y
>>> EmaVY8pe5Fnt2TybgTxK5uHg2oQzEA&s=3DIddAo-k1s8K5UPuVP-_Mm3KDrTJg4AwAYS3
>>> O_-AjiyE&e=3D
>>=20
>> _______________________________________________
>> bmwg mailing list
>> bmwg@ietf.org <mailto:bmwg@ietf.org>
>> https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__www.ietf.org_mai
>> lman_listinfo_bmwg&d=3DDwICAg&c=3DHAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXc=
W
>> zoCI&r=3D6467957JFOdmNjfKujkufIeAE-AdkLRewB-QhIU_Srw&m=3DWqezXoMX37n7yEm=
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>> VY8pe5Fnt2TybgTxK5uHg2oQzEA&s=3DIddAo-k1s8K5UPuVP-_Mm3KDrTJg4AwAYS3O_-A
>> jiyE&e=3D
>=20
> _______________________________________________
> bmwg mailing list
> bmwg@ietf.org
> https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__www.ietf.org_mail
> man_listinfo_bmwg&d=3DDwICAg&c=3DHAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWz=
o
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------------------------------

Message: 4
Date: Tue, 16 Apr 2019 10:15:23 -0700
From: Sarah Banks <sbanks@encrypted.net>
To: bmwg@ietf.org
Subject: Re: [bmwg] Call for Adoption: Benchmarking Methodology for
	Network Security Device Performance
Message-ID: <11406412-B50F-4880-9B4E-A9294D0B503E@encrypted.net>
Content-Type: text/plain; charset=3D"utf-8"

Hello BMWG,

As co-chair, I?m calling Consensus on the call for WG adoption for the B2B =
Frame draft.

Thanks to the author (my co-chair!) and everyone else who indicated support=
 both on the list, and in the previous IETF sessions. The original call for=
 adoption ended at IETF104, and there was an action item for me to call con=
sensus on list, which this email completes.

I would expect to see the draft replaced with draft-ietf-<text> shortly, an=
d we?ll continue our discussions on list and most likely Montreal. Please r=
ead the draft, and submit your feedback/questions/comments to bmwg@ietf.org=
.=20

Kind regards,
Sarah
BMWG Co-Chair
=20
> On Dec 7, 2018, at 10:05 AM, Sarah B <sbanks@encrypted.net> wrote:
>=20
> Hello BMWG,
> 	Another presentation of the NG Firewall draft at IETF103 in Bangkok was =
well received. Thank you for your reviews and feedback. The draft can be fo=
und here:
> =09
> =09
> https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__datatracker.ietf.
> org_doc_draft-2Dbalarajah-2Dbmwg-2Dngfw-2Dperformance_&d=3DDwICAg&c=3DHAk=
Y
> uh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=3D6467957JFOdmNjfKujkufIeAE-Ad
> kLRewB-QhIU_Srw&m=3DWqezXoMX37n7yEmaVY8pe5Fnt2TybgTxK5uHg2oQzEA&s=3DPjSU9=
G
> Py-eqeCGqlk2T8gtfAXQno5wxB_6huAAVgKPI&e=3D
> =09
> 	There has been a lot of discussion, interest, review, and comments on th=
e draft, and I'd like to call for adoption of this draft by the WG. Please =
reply to this email before December 21, 2018 and indicate:
>=20
> (1) whether you support addition of the following milestone to=20
>   the BMWG charter:
>=20
> date TBD: Benchmarking Methodology for Network Security Device=20
> Performance
>=20
>=20
> (2) whether you support the adoption of=20
> draft-balarajah-bmwg-ngfw-performance-05
>=20
>       as the basis document for this milestone
>=20
> (3) whether you commit to reviewing the WG document if adopted
>=20
>=20
>=20
> Thanks for your consideration of the draft!
>=20
> Kind regards,
> Sarah
> bmwg co-chair
> _______________________________________________
> bmwg mailing list
> bmwg@ietf.org
> https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__www.ietf.org_mail
> man_listinfo_bmwg&d=3DDwICAg&c=3DHAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWz=
o
> CI&r=3D6467957JFOdmNjfKujkufIeAE-AdkLRewB-QhIU_Srw&m=3DWqezXoMX37n7yEmaVY=
8
> pe5Fnt2TybgTxK5uHg2oQzEA&s=3DIddAo-k1s8K5UPuVP-_Mm3KDrTJg4AwAYS3O_-AjiyE
> &e=3D
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------------------------------

Subject: Digest Footer

_______________________________________________
bmwg mailing list
bmwg@ietf.org
https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__www.ietf.org_mailman=
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t2TybgTxK5uHg2oQzEA&s=3DIddAo-k1s8K5UPuVP-_Mm3KDrTJg4AwAYS3O_-AjiyE&e=3D


------------------------------

End of bmwg Digest, Vol 175, Issue 1
************************************


From nobody Tue Apr 23 07:24:45 2019
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Subject: [bess] Protocol Action: 'Updated processing of Control Flags for BGP VPLS' to Proposed Standard (draft-ietf-bess-bgp-vpls-control-flags-08.txt)
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The IESG has approved the following document:
- 'Updated processing of Control Flags for BGP VPLS'
  (draft-ietf-bess-bgp-vpls-control-flags-08.txt) as Proposed Standard

This document is the product of the BGP Enabled ServiceS Working Group.

The IESG contact persons are Alvaro Retana, Deborah Brungard and Martin
Vigoureux.

A URL of this Internet Draft is:
https://datatracker.ietf.org/doc/draft-ietf-bess-bgp-vpls-control-flags/




Technical Summary
  This document updates the meaning of the "control flags" fields
  inside the "layer2 info extended community" used for BGP-VPLS NLRI as
  defined in RFC4761. If approved, this document updates RFC4761.

Working Group Summary
  There is good consensus from the WG, and there is no controversy.

Document Quality
  There were active discussions in the WG, many valuable 
  comments received and addressed. A number of iterations 
  reflecting that.

Personnel
  Document Shepherd: Mach Chen
  Responsible Area Director: Martin Vigoureux


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From: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
Date: Wed, 24 Apr 2019 09:57:51 +0530
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Subject: [bess] EVPN Multihoming and Symmetric IRB
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--000000000000950ed705873f2091
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Hi Everyone,

draft-ietf-bess-evpn-inter-subnet-forwarding does not explicitly describe
the implications of EVPN multihoming on IRB. It seems to assume that the
IRB procedures can be easily extrapolated to multihoming following RFC 7432
and it says so at least for the mobility procedures described in section 4.

However, I think there are key implications of multihoming for symmetric
IRB.

Fast Convergence:
Section 8.2 of RFC 7432 says the following:
<snip>
   Upon a failure in connectivity to the attached segment, the PE
   withdraws the corresponding set of Ethernet A-D per ES routes.  This
   triggers all PEs that receive the withdrawal to update their next-hop
   adjacencies for all *MAC addresses* associated with the Ethernet
   segment in question.  If no other PE had advertised an Ethernet A-D
   route for the same segment, then the PE that received the withdrawal
   simply invalidates the *MAC entries *for that segment.  Otherwise, the
   PE updates its next-hop adjacencies accordingly.
</snip>

Clearly, it describes fast convergence only for the MAC addresses of TSs
(and not for their IP addresses). In symmetric IRB, the ingress PE performs
a route lookup for the destination TS prefix in IP-VRF and forwards the
packet to the egress PE. Hence, the above fast convergence is not
applicable. It however is applicable for asymmetric IRB where the
destination subnet is configured in the ingress PE and it performs a lookup
in the BT corresponding to the destination subnet and forwards the frame.

Aliasing and Backup Path:
With symmetric IRB, the ingress PE cannot use alias label (i.e. label
advertised in AD per EVI route) to load balance traffic sent to egress PEs
multihomed to the same CE, since the egress PE needs to first perform a
route lookup for the destination prefix in the IP-VRF to forward the
packet. The ingress PE instead needs to rely on multipath techniques
applicable to L3VPN (such as BGP multipath).

Now, coming to the backup path, section 8.4 of RFC 7432 says the following:
<snip>
   The backup path is a closely related function, but it is used in
   Single-Active redundancy mode.  In this case, a PE also advertises
   that it has reachability to a given EVI/ES using the same combination
   of Ethernet A-D per EVI route and Ethernet A-D per ES route as
   discussed above, but with the "Single-Active" bit in the flags of the
   ESI Label extended community set to 1.  A remote PE that receives a
   MAC/IP Advertisement route with a non-reserved ESI SHOULD consider
   the *advertised MAC address* to be reachable via any PE that has
   advertised this combination of Ethernet A-D routes, and it SHOULD
   install a backup path for that MAC address.
</snip>

Clearly, it describes the backup path only for the MAC address of the TS
(and not for their IP address). Hence, it is not applicable to symmetric
IRB. It however is applicable to asymmetric IRB.

Is my understanding correct? Shouldn't the implications of multihoming on
symmetric IRB be explicitly captured
in draft-ietf-bess-evpn-inter-subnet-forwarding?

Regards,
Muthu

--000000000000950ed705873f2091
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div di=
r=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div class=3D"gmail_default"><s=
pan style=3D"font-family:arial,helvetica,sans-serif">Hi Everyone,</span></d=
iv><div class=3D"gmail_default"><span style=3D"font-family:arial,helvetica,=
sans-serif"><br></span></div><div class=3D"gmail_default"><span style=3D"fo=
nt-family:arial,helvetica,sans-serif">draft-ietf-bess-evpn-inter-subnet-for=
warding does not explicitly describe the implications of EVPN multihoming o=
n IRB. It seems to assume that the IRB procedures can be easily extrapolate=
d to multihoming following RFC 7432 and it says so at least for the mobilit=
y procedures described in section 4.</span><br></div><div class=3D"gmail_de=
fault"><font face=3D"arial, helvetica, sans-serif"><br></font></div><div cl=
ass=3D"gmail_default"><font face=3D"arial, helvetica, sans-serif">However, =
I think there are key implications of multihoming for symmetric IRB.</font>=
</div><div class=3D"gmail_default"><font face=3D"arial, helvetica, sans-ser=
if"><br></font></div><div class=3D"gmail_default"><font face=3D"arial, helv=
etica, sans-serif">Fast Convergence:</font></div><div class=3D"gmail_defaul=
t"><span style=3D"font-family:arial,helvetica,sans-serif">Section 8.2 of RF=
C 7432 says the following:</span><br></div><div class=3D"gmail_default"><fo=
nt face=3D"arial, helvetica, sans-serif">&lt;snip&gt;</font></div><div clas=
s=3D"gmail_default">=C2=A0 =C2=A0Upon a failure in connectivity to the atta=
ched segment, the PE</div><div class=3D"gmail_default">=C2=A0 =C2=A0withdra=
ws the corresponding set of Ethernet A-D per ES routes.=C2=A0 This</div><di=
v class=3D"gmail_default">=C2=A0 =C2=A0triggers all PEs that receive the wi=
thdrawal to update their next-hop</div><div class=3D"gmail_default">=C2=A0 =
=C2=A0adjacencies for all <b>MAC addresses</b> associated with the Ethernet=
</div><div class=3D"gmail_default">=C2=A0 =C2=A0segment in question.=C2=A0 =
If no other PE had advertised an Ethernet A-D</div><div class=3D"gmail_defa=
ult">=C2=A0 =C2=A0route for the same segment, then the PE that received the=
 withdrawal</div><div class=3D"gmail_default">=C2=A0 =C2=A0simply invalidat=
es the <b>MAC entries </b>for that segment.=C2=A0 Otherwise, the</div><div =
class=3D"gmail_default">=C2=A0 =C2=A0PE updates its next-hop adjacencies ac=
cordingly.</div><div class=3D"gmail_default"><font face=3D"arial, helvetica=
, sans-serif">&lt;/snip&gt;</font></div><div class=3D"gmail_default"><font =
face=3D"arial, helvetica, sans-serif">=C2=A0</font><br></div><div class=3D"=
gmail_default"><font face=3D"arial, helvetica, sans-serif">Clearly, it desc=
ribes fast convergence only for the MAC addresses of TSs (and not for their=
 IP addresses). In symmetric IRB, the ingress PE performs a route lookup fo=
r the destination TS prefix in IP-VRF and forwards the packet to the egress=
 PE. Hence, the above fast convergence is not applicable. It however is app=
licable for asymmetric IRB where the destination subnet is configured in th=
e ingress PE and it performs a lookup in the BT corresponding to the destin=
ation subnet and forwards the frame.</font></div><div class=3D"gmail_defaul=
t"><font face=3D"arial, helvetica, sans-serif"><br></font></div><div class=
=3D"gmail_default"><font face=3D"arial, helvetica, sans-serif"><div class=
=3D"gmail_default">Aliasing and Backup Path:<br></div><div class=3D"gmail_d=
efault">With symmetric IRB, the ingress PE cannot use alias label (i.e. lab=
el advertised in AD per EVI route) to load balance traffic sent to egress P=
Es multihomed to the same CE, since the egress PE needs to first perform a =
route lookup for the destination prefix in the IP-VRF to forward the packet=
. The ingress PE instead needs to rely on multipath techniques applicable t=
o L3VPN (such as BGP multipath).<br></div><div class=3D"gmail_default"><br>=
</div><div class=3D"gmail_default">Now, coming to the backup path, section =
8.4 of RFC 7432 says the following:</div><div class=3D"gmail_default">&lt;s=
nip&gt;</div><div class=3D"gmail_default"><div class=3D"gmail_default">=C2=
=A0 =C2=A0The backup path is a closely related function, but it is used in<=
/div><div class=3D"gmail_default">=C2=A0 =C2=A0Single-Active redundancy mod=
e.=C2=A0 In this case, a PE also advertises</div><div class=3D"gmail_defaul=
t">=C2=A0 =C2=A0that it has reachability to a given EVI/ES using the same c=
ombination</div><div class=3D"gmail_default">=C2=A0 =C2=A0of Ethernet A-D p=
er EVI route and Ethernet A-D per ES route as</div><div class=3D"gmail_defa=
ult">=C2=A0 =C2=A0discussed above, but with the &quot;Single-Active&quot; b=
it in the flags of the</div><div class=3D"gmail_default">=C2=A0 =C2=A0ESI L=
abel extended community set to 1.=C2=A0 A remote PE that receives a</div><d=
iv class=3D"gmail_default">=C2=A0 =C2=A0MAC/IP Advertisement route with a n=
on-reserved ESI SHOULD consider</div><div class=3D"gmail_default">=C2=A0 =
=C2=A0the <b>advertised MAC address</b> to be reachable via any PE that has=
</div><div class=3D"gmail_default">=C2=A0 =C2=A0advertised this combination=
 of Ethernet A-D routes, and it SHOULD</div><div class=3D"gmail_default">=
=C2=A0 =C2=A0install a backup path for that MAC address.</div></div><div cl=
ass=3D"gmail_default">&lt;/snip&gt;</div><div class=3D"gmail_default"><br><=
/div><div class=3D"gmail_default">Clearly, it describes the backup path onl=
y for the MAC address of the TS (and not for their IP address). Hence, it i=
s not applicable to symmetric IRB. It however is applicable to asymmetric I=
RB.</div><div class=3D"gmail_default"><br></div><div class=3D"gmail_default=
">Is my understanding correct? Shouldn&#39;t the implications of multihomin=
g on symmetric IRB be explicitly captured in=C2=A0draft-ietf-bess-evpn-inte=
r-subnet-forwarding?</div><div class=3D"gmail_default"><br></div><div class=
=3D"gmail_default">Regards,</div><div class=3D"gmail_default">Muthu</div></=
font></div></div></div></div></div></div></div></div>

--000000000000950ed705873f2091--


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Subject: Re: [bess] Shepherd's review of draft-ietf-bess-nsh-bgp-control-plane-06
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Hi Stephane,

I finally carved some time...

* NEXTHOP encoding:
>>> How is the nexthop encoded in the NLRI ?
>>
>> A bit confused about this question.
>
> [SLI] I'm talking about the nexthop field of the MP_REACH_NLRI =
attribute,=20
> you must set a nexthop field even if it is not used for forwarding and =
you
> need to set how it is encoded.
>
> Ah, that!
> Yes, it's just a loopback address of the advertising SFF.
> Added a paragraph for that.
>[SLI2] Thanks for the new text, I'm just wondering if it is enough =
detailed or not,
> especially as IPv4 or IPv6 NH could be involved.
> Looking at mvpn RFCs, they are using similar wording, so I suppose we =
could=20
> let it this way.

OK, I'm leaving this without further changes.

* BGP ERROR HANDLING:
>>> I don=E2=80=99t see the =E2=80=9Cerror handling=E2=80=9D behavior =
associated with this attribute
>>> (discard, treat-as-withdraw=E2=80=A6)
>>
>> I think the errors are covered by section 6 of RFC 4271, but we need =
to
>> point to it.
>
> [SLI] You have added " Malformed SFP attributes, or those that in =
error in
> some way, MUST be handled as described in Section 6 of [RFC4271]"
> This is not enough ad RFC7606 allows for a more "graceful" process of=20
> errors and it's up to each new attribute to have its own behavior in =
term
> of error processing. RFC7606 has some guidelines.
>
> This one will take a little more time to work up some text.
> We'll get back to you.
>
> [SLI2] This is an important thing to address, and the IESG or Routing =
Directorate
> may catch that as well.

OK, a chunk more text. Does this work for you?

   Section 6 of [RFC4271] describes the handling of malformed BGP
   attributes, or those that are in error in some way.  [RFC7606]
   revises BGP error handling specifically for the for UPDATE message,
   provides guidelines for the authors of documents defining new
   attributes, and revises the error handling procedures for a number of
   existing attributes.  This document introduces the SFP attribute and
   so defines error handling as follows:

   o  When parsing a message, an unknown Attribute Type code or a length
      that suggests that the attribute is longer than the remaining
      message is treated as a malformed message and the "treat-as-
      withdraw" approach used as per [RFC7606].

   o  When parsing a message that contains an SFP attribute, the
      following cases constitute errors:

      1.  Optional bit is set to 0 in SFP attribute.

      2.  Transitive bit is set to 0 in SFP attribute.

      3.  Unknown TLV type field found in SFP attribute.

      4.  TLV length that suggests the TLV extends beyond the end of the
          SFP attribute.

      5.  Association TLV contains an unknown SFPR-RD.

      6.  No Hop TLV found in the SFP attribute.

      7.  No SFT TLV found in a Hop TLV.

      8.  Unknown SFIR-RD found in a Hop TLV.

   o  The errors listed above are treated as follows:

      1., 2., 6., 7.:  The attribute MUST be treated as malformed and
         the "treat-as-withdraw" approach used as per [RFC7606].

      3.:  Unknown TLVs SHOULD be ignored, and message processing SHOULD
         continue.

      4.:  Treated as a malformed message and the "treat-as-withdraw"
         approach used as per [RFC7606]

      5., 8.:  The absence of an RD with which to corollate is nothing
         more than a soft error.  The receiver SHOULD store the
         information from the SFP attribute until a corresponding
         advertisement is received.  An implementation MAY time-out such
         stored SFP attributes to avoid becoming over-loaded.


* FLOWSPEC traffic steering:
>>> NEW COMMENT:
>>> Section 5:
>>> "Note that each FlowSpec update MUST be tagged with the route target
>>>  of the overlay or VPN network for which it is intended."
>> [SLI] You should be more clear that VPN-IPv4 and VPN-IPv6 Flowspec
>> families must be used, it's not just a matter of RTs.
>
> A couple of the authors have discussed this a bit and we are puzzled.
>
> RFC 5575 section 8 discusses the applicability of Flowspecs to VPNs.
> https://www.iana.org/assignments/flow-spec/flow-spec.xhtml#flow-spec-2 =

> does not list any VPN Flowspecs.
> draft-ietf-pce-pcep-flowspec makes observations about VPN =
identification
> and applicability to Flowspecs.
> draft-ietf-idr-flowspec-l2vpn has a redefinition of SAFI 134 to apply =
to=20
> Flowspecs to an L2VPN environment.
>
> [SLI2] I see various cases:
> - traffic is coming from an IPVPNv4 and should be steered on an SFC, =
in such
>   a case RFC5575 Section 8 (AFI/SAFI 1/134) must be used, an RT is =
attached.
> - traffic is coming from the global routing table and should be =
steered on an
>   SFC, in such a case  the base RFC5575 using AFI/SAFI 1/133 must be =
used
>   and there is no RT attached. The trick here is that you need to set =
in the
>   action: - the SFC you want the traffic to be steered on as well as =
the VPN
>   to look the SFC for (Like a redirect RT + SFC steering). If there is =
no VPN
>   redirection, the SFC is considered to be available in the global =
routing table.
> - traffic is coming from an L2VPN, this is similar to the L3VPN case.
> - same considerations applies to IPv6 and VPNv6.

OK, I think we need to separate two things.
Section 5 is concerned with how to select among possible next hops on an =
SFP. That is, the packet is already classified and assigned to an SFP, =
but some load-balancing choices have to be made. So I don't think =
Section 5 is the place for this discussion.
However, Section 7.4 is about classifying traffic onto SFPs. =
Specifically, it is about how to indicate, using BGP, which traffic =
flows should be assigned to which SPF at the Classifier component of the =
SFC system. This section seems to be relevant to the question you are =
asking.

But this second section seems to have it all covered by modelling =
exactly the flowspec function used in BGP flow specification and adding =
an extended community for SFC.

So, I think nothing else is needed for this issue.

Thanks,
Adrian


-----Original Message-----
From: Adrian Farrel [mailto:adrian@olddog.co.uk]=20
Sent: Wednesday, March 06, 2019 16:06
To: LITKOWSKI Stephane OBS/OINIS; =
draft-ietf-bess-nsh-bgp-control-plane@ietf.org
Cc: bess@ietf.org
Subject: RE: Shepherd's review of =
draft-ietf-bess-nsh-bgp-control-plane-06

Thanks again Stephane,

I think we have closure on most (but not all) of your points. I'll post =
another revision now because it makes the incremental changes easier to =
process. But we can have another go round if any of the unresolved =
issues merit it.

One thing to push back on from before was the use of "portal" or =
"gateway". We were using "portal" and you asked us to change to =
"gateway". I initially thought that would be OK, but on reflection we =
think that "gateway" has specific connotations in networking where it =
means an interworking function between two different protocols and this =
is most definitely not what is intended. So, because "portal" is a =
synonym, we prefer to go back to using that.

   Thus the SFF can be seen as a portal in the underlay network through
   which a particular SFI is reached.

Cheers,
Adrian

> New comment:
>
> " When the SFF receives the packet and the NSH back from the SFI it
>   MUST select the next SFI"
>
> [SLI] Even if I agree that this is the intended behavior, it is not =
the
> purpose of this document to set the dataplane behavior of NSH. I
> think keeping the "MUST" as lower case is fine.

Ah yes.
I got carried away.

>>> The Figure 1 is not really used in this section as part of the =
existing
>>> text. I would be better to have a companion text that explains the
>>> figure.
>>
>> Wow! Yes. That's embarrassing.
>
> [SLI] The provided text is good. Just few comments:
>
> - the figure wraps on two pages, I missed the SFa in the figure as it =
is
>   located on the other page. It would be great if you could make it =
fit
>   on one page.

Hmmm, yes.
I will make the figure small enough to fit on one page, but I won't =
handle pagination at this stage: the RFC Editor will resolve that in the =
final formatting.

> - don't you need tunnels between SFF2 and SFF3 and between SFF1=20
>   and SFF4 (full mesh). I agree that tunnel may be established on =
demand
>   if an SFC is using two SFFs, but here we don't have this =
information.

You *could* certainly have a those tunnels. But in practice there is =
unlikely to be a full mesh. This is a bit like a content distribution =
problem: a multi-layer network engineering solution is needed to place =
the SFs and decide which SFFs need to be connected with tunnels. =
Furthermore, if an SFC will never need to take SFs in a particular =
order, then tunnels wouldn't be needed.

> As the figure is already complex, adding tunnels may overload it. =
Maybe
> we could add a text telling that to simplify the figure only some =
tunnels
> between SFFs are represented.

Right, no need to complicate the figure.
I'll add...
      <t>Note that, for convenience and clarity, <xref =
target=3D"SFCarch" /> shows only a few tunnels between
         SFFs.  There could be a full mesh of such tunnels, or more =
likely, a selection of tunnels connecting
         key SFFs to enable the construction of SFPs and to balance load =
and traffic in the network.</t>

> - the example of SFC looks strange to me as SFd may be used twice
>   in the chain why not using " SFa, an SF of type SFTx, and SFe" ?

Bad text, well caught.
Text should read...

      Suppose an SFC needs to include SFa,
      an SF of type SFTx, and SFc.

> - There is a sentence telling that the figure illustrates =
loadbalancing,
>   however I think that the sentence " A number of SFPs can be
>   constructed using any instance of SFb or using SFd." is not enough
>   to describe the loadbalancing. Who is doing the loadbalancing ?

OK. Now reads...

      <t>This figure demonstrates how load balancing can be achieved by =
creating several SFPs that satisfy
         the same SFC.  Suppose an SFC needs to include SFa, an SF of =
type SFTx, and SFc.  A number of SFPs
         can be constructed using any instance of SFb or using SFd.  =
Load balancing may be applied at two
         places:
         <list style=3D"symbols">
           <t>The Classifier may distribute different flows onto =
different SFPs to share the load in the
              network and across SFIs.</t>
           <t>SFF-2 may distribute different flows (on the same SFP) to =
different instances of SFb to share
              the processing load.</t>
         </list></t>

>>> =E2=80=9CThe Service Function Type identifies a service =
function=E2=80=9D. I don=E2=80=99t
>>> think we can really say that, it identifies the type of service the =
SF
>>> is providing but not the SF itself.
>>
>> Yes
>
> [SLI] The new text sounds strange.  Even if it is correct, it sounds =
as a repetition:
> " The Service Function Type identifies a service function type".
> Could we use something like : "The Service Function Type identifies =
the
> functions/features of service function can offer".

OK

>>> How is the nexthop encoded in the NLRI ?
>>
>> A bit confused about this question.
>
> [SLI] I'm talking about the nexthop field of the MP_REACH_NLRI =
attribute,=20
> you must set a nexthop field even if it is not used for forwarding and =
you
> need to set how it is encoded.

Ah, that!
Yes, it's just a loopback address of the advertising SFF.
Added a paragraph for that.

>>> I don=E2=80=99t see the =E2=80=9Cerror handling=E2=80=9D behavior =
associated with this attribute
>>> (discard, treat-as-withdraw=E2=80=A6)
>>
>> I think the errors are covered by section 6 of RFC 4271, but we need =
to
>> point to it.
>
> [SLI] You have added " Malformed SFP attributes, or those that in =
error in
> some way, MUST be handled as described in Section 6 of [RFC4271]"
> This is not enough ad RFC7606 allows for a more "graceful" process of=20
> errors and it's up to each new attribute to have its own behavior in =
term
> of error processing. RFC7606 has some guidelines.

This one will take a little more time to work up some text.
We'll get back to you.

>>> Section 4.1
>
> [SLI] I have read it again, I think the last sentence was causing me
> some trouble:
> "An SFF
>   that has a presence in multiple service function overlay networks
>   (i.e., imports more than one RT) may find it helpful to maintain
>   separate forwarding state for each overlay network.".
>
> The isolation of the controlplane and forwarding information between
> tenants is a mandatory thing for security reason. The "may find it
> helpful" makes this something nice to have making the multitenancy
> case not widely deployed.

OK, I see the problem.
Of course, each SFP is separate routing state (like a signalled TE-LSP), =
so it is not technically necessary to keep separate routing state for =
each overlay network. The tenants would have no visibility into the =
state at SFFs.
And from a black box point of view, no one can tell the difference, so =
we don't need to instruct implementations.
But we can agree that it would be highly likely to maintain separate =
forwarding state for each overlay network.
So I will strengthen this to s/may find it helpful/will usually/

> NEW COMMENT:
> Section 5:
> "Note that each FlowSpec update MUST be tagged with the route target
>  of the overlay or VPN network for which it is intended."
> [SLI] You should be more clear that VPN-IPv4 and VPN-IPv6 Flowspec
> families must be used, it's not just a matter of RTs.

A couple of the authors have discussed this a bit and we are puzzled.

RFC 5575 section 8 discusses the applicability of Flowspecs to VPNs.
https://www.iana.org/assignments/flow-spec/flow-spec.xhtml#flow-spec-2 =
does not list any VPN Flowspecs.
draft-ietf-pce-pcep-flowspec makes observations about VPN identification =
and applicability to Flowspecs.
draft-ietf-idr-flowspec-l2vpn has a redefinition of SAFI 134 to apply to =
Flowspecs to an L2VPN environment.

I suspect that you are referring to the last of these four references.

Maybe you could suggest some text that would cover your concern.

>>> Section 7.1
>>>
>>> While I understand that the node doing the classification can =
perform a deep
>>> packet inspection to get an entropy indicator, any intermediate node =
cannot
>>> set it again as the NSH header will be there.
>>=20
>> *If* you want entropy for the underlay network, you have to get
>> it from somewhere. And an entropy label is going to be a lot more
>> practical that hoping that each hope in the underlay can do some
>> form of hash.
>>
>> I don't propose any changes to the document for this point, but=20
>> do feel free to negotiate.
>
> [SLI] I don't think that the current text actually solves the =
loadbalancing
> issue in the underlay. However I'm also wondering if it's the job of =
this
> draft (which defines a controlplane) to define where to set the =
entropy
> indicator and what are the requirements in term of hashing. It's more =
a
> dataplane issue, out of scope of this draft. I don't know if there is =
already
> other document in SFC or other WGs dealing with entropy issues when
> NSH is there.
> So I see two options:
> - you address fully the problem in your draft
> - or you make it out of scope, so some text should be=20
>   removed. You can still say that there is a problem to solve.

I like your second option =F0=9F=98=8A

And the problem is made more complex when you consider that there may be =
different underlays between successive SFFs meaning that entropy has to =
be mapped between tunnel types.

Actually, this is a good change. This is a control plane document, not a =
full system specification. We have deleted the whole entropy section, =
and strengthened the text in 2.2 to note that "something must be done".

> I don=E2=80=99t like the representation of RD using =
=E2=80=9C192.0.2.1,1=E2=80=9D as the =E2=80=9C,=E2=80=9D can
> be confusing with a regular separator. Why not using =
:=E2=80=9D192.0.2.1:1=E2=80=9D
> notation which is well known ?
>
> [SLI] I don't see the change in v08

Snafu
Made the change in the XML and didn't regenerate the TXT.
Yes, "idiot" is an appropriate word.

>>> Section 8.9.1:
>>>
>>> How does an SFF know that an attached SFI is stateful ? I =
don=E2=80=99t
>>> think it can know that.
>>
>> Well, how does the SFF know which SFIs are attached and what
>> their types are?
>> The registration of SFIs to their SFFs is out of scope of this =
document=20
>> (I think it was raised as a separate function in =
draft-ietf-sfc-control-plane).
>
> [SLI] Fine, could you tell that it is out of scope ?

Certainly.

>>> I don=E2=80=99t think that the fact that SFF2 is used in both =
direction is safe
>>> from a load balancing perspective.
>>> If the hashing algorithm used by SFF2 is sensible to the order of =
the
>>> keys (like source vs dest address, or source vs dest port), it may=20
>>> provide a different SFI as a result of the hashing between the
>>> forward and the reverse flow.
>>
>> It's unclear what hashing might be used, but it seems to me that the
>> primary choice will be based on the SPI.
>> Of course, if the hash goes further (i.e.., payload) and the SFF is =
aware=20
>> of forward/reverse traffic it is capable of hashing the right fields.
>>
>> But does this smells of an implementation detail?
>
> [SLI] Of course that will be implementation dependent, but the fact =
that
>  it is implementation dependent makes the behavior unpredictable and
> does not ensure that you will get symmetry.

OK. I went to add some text, looked for the right place and found =
section 7.3 where we have...

   For bidirectional SFPs where the same instance of a stateful SF must
   be traversed in both directions, it is not enough to leave the choice
   of service function instance as a local choice even if the load
   balancing is stable because coordination would be required between
   the decision points in the forward and reverse directions and this
   may be hard to achieve in all cases except where it is the same SFF
   that makes the choice in both directions.

   Note that this approach necessarily increases the amount of SFP state
   in the network (i.e., there are more SFPs).  It is possible to
   mitigate this effect by careful construction of SFPs built from a
   concatenation of other SFPs.

I think that covers it.
I'll put in a back pointer from 8.9.1 to 7.3.
Will also add a note to 8.9.1 to the effect that the problem can be =
resolved by a combination of detailed (choice-free) SFPs, and suitable =
programming of Classifiers.

>>> Section 9:
>>>
>>> Do we have to set limits on receiving nodes in term of number of
>>> states received from the controller to mitigate some attack ?
>>
>> I'm not sure, but probably not. But anyway, that would be out of =
scope.
>
> [SLI] I'm challenging, as the SecDir may challenge you on that point=20
> or a similar one.

So the attack would rely on the controller being subverted, or the =
communications between controller and SFF being spoofed.

In the former case we have a complete disaster (similar to a route =
reflector being subverted), and the things that go wrong will be far =
worse than an overload attack on an SFF. And, not only is this problem =
out of scope, but it is not defendable in open systems. I think we rely =
on regulated software upgrades.

The communications between controller and SFF do not form part of this =
specification. So, I will add a paragraph to highlight the risk.

>>> The text talks about security of BGP, what kind of mechanism
>>> should be put in place ?
>>
>> This has similar security behaviour to a L3VPN, so I guess the same =
rules apply.
>
> [SLI] That would be good to tell this in the sec considerations. As =
you use
> similar distribution mechanism as RFC4364, the same sec considerations =
applies.

OK

>>> Do we have any interdomain considerations ?
>>
>> 8300 says that the intended scope is for use within a single =
provider's operational
>> domain.
>
> [SLI] That would be good to remind it as well.

OK. Added.

>>> References:
>>>
>>> I think that the mpls-sfc and mpls-sfc-encaps should also be
>>> normative as you are defining a controlplane to use them.
>>
>>I don't mind doing that.
>
> [SLI] These two are more debatable. Let's keep them as info, and=20
> we will see if IESG raises any concern.

Well, actually, since those two docs are on the Standards Track and are =
well ahead in the pipe, let's make them Normative.


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cj48L3A+PC9kaXY+


--=====_003_next=====--

--=====_002_next=====--

--=====_001_next=====--


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A new Request for Comments is now available in online RFC libraries.

        
        RFC 8584

        Title:      Framework for Ethernet VPN Designated 
                    Forwarder Election Extensibility 
        Author:     J. Rabadan, Ed.,
                    S. Mohanty, Ed.,
                    A. Sajassi, 
                    J. Drake,
                    K. Nagaraj, 
                    S. Sathappan
        Status:     Standards Track
        Stream:     IETF
        Date:       April 2019
        Mailbox:    jorge.rabadan@nokia.com, 
                    satyamoh@cisco.com, 
                    sajassi@cisco.com,  
                    jdrake@juniper.net, 
                    kiran.nagaraj@nokia.com,  
                    senthil.sathappan@nokia.com
        Pages:      32
        Characters: 69774
        Updates:    RFC 7432

        I-D Tag:    draft-ietf-bess-evpn-df-election-framework-09.txt

        URL:        https://www.rfc-editor.org/info/rfc8584

        DOI:        10.17487/RFC8584

An alternative to the default Designated Forwarder (DF) selection
algorithm in Ethernet VPNs (EVPNs) is defined.  The DF is the
Provider Edge (PE) router responsible for sending Broadcast, Unknown
Unicast, and Multicast (BUM) traffic to a multihomed Customer Edge
(CE) device on a given VLAN on a particular Ethernet Segment (ES).
In addition, the ability to influence the DF election result for a
VLAN based on the state of the associated Attachment Circuit (AC) is
specified.  This document clarifies the DF election Finite State
Machine in EVPN services.  Therefore, it updates the EVPN
specification (RFC 7432).

This document is a product of the BGP Enabled Services Working Group of the IETF.

This is now a Proposed Standard.

STANDARDS TRACK: This document specifies an Internet Standards Track
protocol for the Internet community, and requests discussion and suggestions
for improvements.  Please refer to the current edition of the Official
Internet Protocol Standards (https://www.rfc-editor.org/standards) for the 
standardization state and status of this protocol.  Distribution of this 
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From: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
Date: Thu, 25 Apr 2019 11:38:07 +0530
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Subject: Re: [bess] EVPN Multihoming and Symmetric IRB
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--000000000000095a0c058754a516
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Hi Bob,

Thanks for your response. Please see inline..

On Thu, Apr 25, 2019 at 6:28 AM <wang.yubao2@zte.com.cn> wrote:

> Hi Muthu and everyone else,
>
>
> The IP Aliasing in Symmetric IRB is described in draft-sajassi-bess-evpn-ip-aliasing-00
> .
>
> It works well for each local host<IP,MAC> learned on the IRB interface.
>
Glad to know that my understand that fast convergence, aliasing and backup
path as described in RFC 7432 is applicable only for host MAC addresses and
not for their IP addresses is correct :) I think it is important to capture
this implication for symmetric IRB
in draft-ietf-bess-evpn-inter-subnet-forwarding and probably add a
reference to draft-sajassi-bess-evpn-ip-aliasing to indicate how those
functionalities can be realized in the symmetric IRB case.

On a different note, when IP aliasing is used, I think it slightly modifies
the definition of symmetric IRB because the egress PE is no longer doing a
lookup in the IP-VRF, rather forwarding the packet on the ES after doing a
LFIB lookup. This should perhaps be captured in
draft-sajassi-bess-evpn-ip-aliasing.

>
> I think when the IRB interface itself is configured with an anycast
> Gateway IP-address for its corresponding subnet,
>
> the IP address of the IRB interface itself doesn't have an explicit ESI to
> be announced together with its own MAC/IP address in current documents,
>
Why do we need a non-zero ES for the anycast gateway IP address? My
understanding is that you include the gateway IP address in the MAC/IP
advertisement route for MAC address aliasing so that the receiver can check
if the received IP address matches with the locally configured anycast
gateway IP address. Does it serve any other purpose?

Regards,
Muthu

> Can we use an vESI for IRB interface itself or its corresponding MAC-VRF
> (which is similar ot the I-ESI concept)?
>
> This issue exists in both symmetric IRB and asymmetric IRB.
>
>
> Thanks
>
> Bob
>
>
> On Wed, 24 Apr 2019 09:57:51 +0530
>
> Muthu Arul Mozhi Perumal <muthu.arul@gmail.com> wrote:
>
>
> > Hi Everyone,
>
> >
>
> > draft-ietf-bess-evpn-inter-subnet-forwarding does not explicitly describe
>
> > the implications of EVPN multihoming on IRB. It seems to assume that the
>
> > IRB procedures can be easily extrapolated to multihoming following RFC
> 7432
>
> > and it says so at least for the mobility procedures described in section
> 4.
>
> >
>
> > However, I think there are key implications of multihoming for symmetric
>
> > IRB.
>
> >
>
> > Fast Convergence:
>
> > Section 8.2 of RFC 7432 says the following:
>
> > <snip>
>
> >    Upon a failure in connectivity to the attached segment, the PE
>
> >    withdraws the corresponding set of Ethernet A-D per ES routes.  This
>
> >    triggers all PEs that receive the withdrawal to update their next-hop
>
> >    adjacencies for all *MAC addresses* associated with the Ethernet
>
> >    segment in question.  If no other PE had advertised an Ethernet A-D
>
> >    route for the same segment, then the PE that received the withdrawal
>
> >    simply invalidates the *MAC entries *for that segment.  Otherwise, the
>
> >    PE updates its next-hop adjacencies accordingly.
>
> > </snip>
>
> >
>
> > Clearly, it describes fast convergence only for the MAC addresses of TSs
>
> > (and not for their IP addresses). In symmetric IRB, the ingress PE
> performs
>
> > a route lookup for the destination TS prefix in IP-VRF and forwards the
>
> > packet to the egress PE. Hence, the above fast convergence is not
>
> > applicable. It however is applicable for asymmetric IRB where the
>
> > destination subnet is configured in the ingress PE and it performs a
> lookup
>
> > in the BT corresponding to the destination subnet and forwards the frame.
>
> >
>
> > Aliasing and Backup Path:
>
> > With symmetric IRB, the ingress PE cannot use alias label (i.e. label
>
> > advertised in AD per EVI route) to load balance traffic sent to egress
> PEs
>
> > multihomed to the same CE, since the egress PE needs to first perform a
>
> > route lookup for the destination prefix in the IP-VRF to forward the
>
> > packet. The ingress PE instead needs to rely on multipath techniques
>
> > applicable to L3VPN (such as BGP multipath).
>
> >
>
> > Now, coming to the backup path, section 8.4 of RFC 7432 says the
> following:
>
> > <snip>
>
> >    The backup path is a closely related function, but it is used in
>
> >    Single-Active redundancy mode.  In this case, a PE also advertises
>
> >    that it has reachability to a given EVI/ES using the same combination
>
> >    of Ethernet A-D per EVI route and Ethernet A-D per ES route as
>
> >    discussed above, but with the "Single-Active" bit in the flags of the
>
> >    ESI Label extended community set to 1.  A remote PE that receives a
>
> >    MAC/IP Advertisement route with a non-reserved ESI SHOULD consider
>
> >    the *advertised MAC address* to be reachable via any PE that has
>
> >    advertised this combination of Ethernet A-D routes, and it SHOULD
>
> >    install a backup path for that MAC address.
>
> > </snip>
>
> >
>
> > Clearly, it describes the backup path only for the MAC address of the TS
>
> > (and not for their IP address). Hence, it is not applicable to symmetric
>
> > IRB. It however is applicable to asymmetric IRB.
>
> >
>
> > Is my understanding correct? Shouldn't the implications of multihoming on
>
> > symmetric IRB be explicitly captured
>
> > in draft-ietf-bess-evpn-inter-subnet-forwarding?
>
> >
>
> > Regards,
>
> > Muthu
>
>
>
>
>
>
>

--000000000000095a0c058754a516
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div di=
r=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,helvetica=
,sans-serif;font-size:small">Hi Bob,</div><div class=3D"gmail_default" styl=
e=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;fo=
nt-size:small">Thanks for your response. Please see inline..</div></div><br=
><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, A=
pr 25, 2019 at 6:28 AM &lt;<a href=3D"mailto:wang.yubao2@zte.com.cn">wang.y=
ubao2@zte.com.cn</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" =
style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);pa=
dding-left:1ex"><div class=3D"gmail-m_-8426915168820807911zcontentRow"><p s=
tyle=3D"font-size:14px;font-family:=E5=AE=8B=E4=BD=93,SimSun">Hi Muthu and =
everyone else,</p><p style=3D"font-size:14px;font-family:=E5=AE=8B=E4=BD=93=
,SimSun"><br></p><p style=3D"font-size:14px;font-family:=E5=AE=8B=E4=BD=93,=
SimSun">The IP Aliasing in Symmetric IRB is described in=C2=A0<span style=
=3D"font-family:=E5=AE=8B=E4=BD=93,SimSun;line-height:21px">draft-sajassi-b=
ess-evpn-ip-aliasing-00 .</span></p><p style=3D"font-size:14px;font-family:=
=E5=AE=8B=E4=BD=93,SimSun">It works well for each local host&lt;IP,MAC&gt; =
learned on the IRB interface.</p></div></blockquote><div class=3D"gmail_def=
ault" style=3D"font-family:arial,helvetica,sans-serif;font-size:small">Glad=
 to know that my understand that fast convergence, aliasing and backup path=
 as described in RFC 7432 is applicable only for host MAC addresses and not=
 for their IP addresses is correct :) I think it is important to capture th=
is implication for symmetric IRB in=C2=A0draft-ietf-bess-evpn-inter-subnet-=
forwarding and probably add a reference to=C2=A0draft-sajassi-bess-evpn-ip-=
aliasing to indicate how those functionalities can be realized in the symme=
tric IRB case.</div><div class=3D"gmail_default" style=3D"font-family:arial=
,helvetica,sans-serif;font-size:small"><br></div><div class=3D"gmail_defaul=
t" style=3D"font-family:arial,helvetica,sans-serif;font-size:small">On a di=
fferent note, when IP aliasing is used, I think it slightly modifies the de=
finition of symmetric IRB because the egress PE is no longer doing a lookup=
 in the IP-VRF, rather forwarding the packet on the ES after doing a LFIB l=
ookup. This should perhaps be captured in draft-sajassi-bess-evpn-ip-aliasi=
ng.</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8e=
x;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class=3D"gm=
ail-m_-8426915168820807911zcontentRow"><p style=3D"font-size:14px;font-fami=
ly:=E5=AE=8B=E4=BD=93,SimSun"><br></p><p style=3D"font-size:14px;font-famil=
y:=E5=AE=8B=E4=BD=93,SimSun">I think when the IRB interface itself is confi=
gured with an anycast Gateway IP-address for its corresponding subnet,</p><=
p style=3D"font-size:14px;font-family:=E5=AE=8B=E4=BD=93,SimSun">the IP add=
ress of the IRB interface itself doesn&#39;t have an explicit ESI to be ann=
ounced together with its own MAC/IP address in current documents,</p></div>=
</blockquote><div><span class=3D"gmail_default" style=3D"font-family:arial,=
helvetica,sans-serif;font-size:small">Why do we need a non-zero ES for the =
anycast gateway IP address? My understanding is that you include the gatewa=
y IP address in the MAC/IP advertisement route for MAC address aliasing so =
that the receiver can check if the received IP address matches with the loc=
ally configured anycast gateway IP address. Does it serve any other purpose=
?</span></div><div><span class=3D"gmail_default" style=3D"font-family:arial=
,helvetica,sans-serif;font-size:small"><br></span></div><div><span class=3D=
"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;font-size:s=
mall">Regards,</span></div><div><span class=3D"gmail_default" style=3D"font=
-family:arial,helvetica,sans-serif;font-size:small">Muthu=C2=A0</span>=C2=
=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8e=
x;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class=3D"gm=
ail-m_-8426915168820807911zcontentRow"><p style=3D"font-size:14px;font-fami=
ly:=E5=AE=8B=E4=BD=93,SimSun">Can we use an vESI for IRB interface itself o=
r its corresponding MAC-VRF (which is similar ot the I-ESI concept)?=C2=A0<=
/p><p style=3D"font-size:14px;font-family:=E5=AE=8B=E4=BD=93,SimSun">This i=
ssue exists in both symmetric IRB and asymmetric IRB.=C2=A0</p><p style=3D"=
font-size:14px;font-family:=E5=AE=8B=E4=BD=93,SimSun"><br></p><p style=3D"f=
ont-size:14px;font-family:=E5=AE=8B=E4=BD=93,SimSun">Thanks</p><p style=3D"=
font-size:14px;font-family:=E5=AE=8B=E4=BD=93,SimSun">Bob</p><p><br></p><p>=
On Wed, 24 Apr 2019 09:57:51 +0530</p><p>Muthu Arul Mozhi Perumal &lt;<a hr=
ef=3D"mailto:muthu.arul@gmail.com" target=3D"_blank">muthu.arul@gmail.com</=
a>&gt; wrote:</p><p><br></p><p>&gt; Hi Everyone,</p><p>&gt;=C2=A0</p><p>&gt=
; draft-ietf-bess-evpn-inter-subnet-forwarding does not explicitly describe=
</p><p>&gt; the implications of EVPN multihoming on IRB. It seems to assume=
 that the</p><p>&gt; IRB procedures can be easily extrapolated to multihomi=
ng following RFC 7432</p><p>&gt; and it says so at least for the mobility p=
rocedures described in section 4.</p><p>&gt;=C2=A0</p><p>&gt; However, I th=
ink there are key implications of multihoming for symmetric</p><p>&gt; IRB.=
</p><p>&gt;=C2=A0</p><p>&gt; Fast Convergence:</p><p>&gt; Section 8.2 of RF=
C 7432 says the following:</p><p>&gt; &lt;snip&gt;</p><p>&gt; =C2=A0 =C2=A0=
Upon a failure in connectivity to the attached segment, the PE</p><p>&gt; =
=C2=A0 =C2=A0withdraws the corresponding set of Ethernet A-D per ES routes.=
=C2=A0 This</p><p>&gt; =C2=A0 =C2=A0triggers all PEs that receive the withd=
rawal to update their next-hop</p><p>&gt; =C2=A0 =C2=A0adjacencies for all =
*MAC addresses* associated with the Ethernet</p><p>&gt; =C2=A0 =C2=A0segmen=
t in question.=C2=A0 If no other PE had advertised an Ethernet A-D</p><p>&g=
t; =C2=A0 =C2=A0route for the same segment, then the PE that received the w=
ithdrawal</p><p>&gt; =C2=A0 =C2=A0simply invalidates the *MAC entries *for =
that segment.=C2=A0 Otherwise, the</p><p>&gt; =C2=A0 =C2=A0PE updates its n=
ext-hop adjacencies accordingly.</p><p>&gt; &lt;/snip&gt;</p><p>&gt;=C2=A0<=
/p><p>&gt; Clearly, it describes fast convergence only for the MAC addresse=
s of TSs</p><p>&gt; (and not for their IP addresses). In symmetric IRB, the=
 ingress PE performs</p><p>&gt; a route lookup for the destination TS prefi=
x in IP-VRF and forwards the</p><p>&gt; packet to the egress PE. Hence, the=
 above fast convergence is not</p><p>&gt; applicable. It however is applica=
ble for asymmetric IRB where the</p><p>&gt; destination subnet is configure=
d in the ingress PE and it performs a lookup</p><p>&gt; in the BT correspon=
ding to the destination subnet and forwards the frame.</p><p>&gt;=C2=A0</p>=
<p>&gt; Aliasing and Backup Path:</p><p>&gt; With symmetric IRB, the ingres=
s PE cannot use alias label (i.e. label</p><p>&gt; advertised in AD per EVI=
 route) to load balance traffic sent to egress PEs</p><p>&gt; multihomed to=
 the same CE, since the egress PE needs to first perform a</p><p>&gt; route=
 lookup for the destination prefix in the IP-VRF to forward the</p><p>&gt; =
packet. The ingress PE instead needs to rely on multipath techniques</p><p>=
&gt; applicable to L3VPN (such as BGP multipath).</p><p>&gt;=C2=A0</p><p>&g=
t; Now, coming to the backup path, section 8.4 of RFC 7432 says the followi=
ng:</p><p>&gt; &lt;snip&gt;</p><p>&gt; =C2=A0 =C2=A0The backup path is a cl=
osely related function, but it is used in</p><p>&gt; =C2=A0 =C2=A0Single-Ac=
tive redundancy mode.=C2=A0 In this case, a PE also advertises</p><p>&gt; =
=C2=A0 =C2=A0that it has reachability to a given EVI/ES using the same comb=
ination</p><p>&gt; =C2=A0 =C2=A0of Ethernet A-D per EVI route and Ethernet =
A-D per ES route as</p><p>&gt; =C2=A0 =C2=A0discussed above, but with the &=
quot;Single-Active&quot; bit in the flags of the</p><p>&gt; =C2=A0 =C2=A0ES=
I Label extended community set to 1.=C2=A0 A remote PE that receives a</p><=
p>&gt; =C2=A0 =C2=A0MAC/IP Advertisement route with a non-reserved ESI SHOU=
LD consider</p><p>&gt; =C2=A0 =C2=A0the *advertised MAC address* to be reac=
hable via any PE that has</p><p>&gt; =C2=A0 =C2=A0advertised this combinati=
on of Ethernet A-D routes, and it SHOULD</p><p>&gt; =C2=A0 =C2=A0install a =
backup path for that MAC address.</p><p>&gt; &lt;/snip&gt;</p><p>&gt;=C2=A0=
</p><p>&gt; Clearly, it describes the backup path only for the MAC address =
of the TS</p><p>&gt; (and not for their IP address). Hence, it is not appli=
cable to symmetric</p><p>&gt; IRB. It however is applicable to asymmetric I=
RB.</p><p>&gt;=C2=A0</p><p>&gt; Is my understanding correct? Shouldn&#39;t =
the implications of multihoming on</p><p>&gt; symmetric IRB be explicitly c=
aptured</p><p>&gt; in draft-ietf-bess-evpn-inter-subnet-forwarding?</p><p>&=
gt;=C2=A0</p><p>&gt; Regards,</p><p>&gt; Muthu</p><p style=3D"font-size:14p=
x;font-family:=E5=AE=8B=E4=BD=93,SimSun"><br></p><p style=3D"font-size:14px=
;font-family:=E5=AE=8B=E4=BD=93,SimSun"><br></p><p style=3D"font-size:14px;=
font-family:=E5=AE=8B=E4=BD=93,SimSun"><br></p><p style=3D"font-size:14px;f=
ont-family:=E5=AE=8B=E4=BD=93,SimSun"><br></p><p style=3D"font-size:14px;fo=
nt-family:=E5=AE=8B=E4=BD=93,SimSun"><br></p></div></blockquote></div></div=
></div></div></div>

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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Thu, 25 Apr 2019 09:07:20 -0700
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To: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
Cc: "EXT - thomas.morin@orange.com" <thomas.morin@orange.com>, Robert Kebler <rkebler@juniper.net>,  "bess-chairs@ietf.org" <bess-chairs@ietf.org>, BESS <bess@ietf.org>
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Subject: Re: [bess] WGLC, IPR and implementation poll for draft-ietf-bess-mvpn-fast-failover
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Hi Jeffrey,
much appreciate your review and the feedback on the proposed changes based
on our discussion in Prague.

Regards,
Greg

On Thu, Apr 4, 2019 at 4:04 PM Greg Mirsky <gregimirsky@gmail.com> wrote:

> Hi Jeffrey,
> many thanks to you and Sandy for taking the time to review the remaining
> questions in Prague. Attached please find the updated version -06 and its
> diff to highlight the latest changes.
>
> Regards,
> Greg
>
> On Thu, Mar 14, 2019 at 3:04 AM Jeffrey (Zhaohui) Zhang <
> zzhang@juniper.net> wrote:
>
>> Thomas, Bob,
>>
>>
>>
>> Some questions below for you. Some old, and some new.
>>
>>
>>
>> Greg,
>>
>>
>>
>> Sorry for the late response.
>>
>> Please see zzh> below. I trimmed some points that we agree on.
>>
>>
>>
>> *From:* Greg Mirsky <gregimirsky@gmail.com>
>> *Sent:* Wednesday, December 5, 2018 1:38 PM
>> *To:* Jeffrey (Zhaohui) Zhang <zzhang@juniper.net>
>> *Cc:* EXT - thomas.morin@orange.com <thomas.morin@orange.com>; Robert
>> Kebler <rkebler@juniper.net>; bess-chairs@ietf.org; BESS <bess@ietf.org>
>> *Subject:* Re: [bess] WGLC, IPR and implementation poll for
>> draft-ietf-bess-mvpn-fast-failover
>>
>>
>>
>> Hi Jeffrey,
>>
>> thank you for the review, detailed questions and helpful comments. Pleas=
e
>> find my notes, answers in-line tagged GIM>>.
>>
>>
>>
>> Regards,
>>
>> Greg
>>
>>
>>
>> On Fri, Nov 30, 2018 at 5:14 PM Jeffrey (Zhaohui) Zhang <
>> zzhang@juniper.net> wrote:
>>
>> Hi,
>>
>>
>>
>> I have the following questions/comments:
>>
>>
>>
>>    The procedure described here is an OPTIONAL procedure that consists
>>
>>    of having a downstream PE take into account the status of P-tunnels
>>
>>    rooted at each possible upstream PEs, for including or not including
>>
>>    each given PE in the list of candidate UMHs for a given (C-S,C-G)
>>
>>    state.  The result is that, if a P-tunnel is "down" (see
>>
>>    Section 3.1), the PE that is the root of the P-tunnel will not be
>>
>>    considered for UMH selection, which will result in the downstream PE
>>
>>    to failover to the upstream PE which is next in the list of
>>
>>    candidates.
>>
>>
>>
>> Is it possible that a p2mp tunnel is considered up by some leaves but
>> down by some other leaves, leaving to them choosing different UMH? In th=
at
>> case, procedures described in Section 9.1.1 ("Discarding Packets from Wr=
ong
>> PE") of RFC 6513 must be used. I see that this is actually pointed out
>> later in section 6 =E2=80=93 good to have a pointer to it right here.
>>
>> GIM>> Would the following new text that follows the quoted text address
>> your concern:
>>
>> NEW TEXT:
>>
>>    If rules to determine the state of the P-tunnel are not
>>
>>    consistent across all PEs, then some may arrive at a different
>>
>>    conclusion regarding the state of the tunnel, In such a scenario,
>>
>>    procedures described in Section 9.1.1 of [RFC 6513] MUST be used
>>
>
>
>> GIM>> Accepted
>>
>
>
>
>> Zzh> It=E2=80=99s not that the =E2=80=9Crules =E2=80=A6 are not consiste=
nt=E2=80=9D. It=E2=80=99s that by nature
>> some PEs may think the tunnel is down while the others may think the tun=
nel
>> is still up (because they=E2=80=99re on different tunnel branches), even=
 when they
>> follow the same rules. Traffic duplication in this case is also only wit=
h
>> inclusive tunnels =E2=80=93 so how about the following?
>>
>>
>>
>>    Because all PEs may arrive at a different
>>
>>    conclusion regarding the state of the tunnel,
>>
>>    procedures described in Section 9.1.1 of [RFC 6513] MUST be used
>>
>>    when using inclusive tunnels.
>>
>>
>>
>> Additionally, the text in section 3 seems to be more biased on Single
>> Forwarder Election choosing the UMH with the highest IP address. Section=
 5
>> of RFC6513 also describes two other options, hashing or based on =E2=80=
=9Cinstalled
>> UMH route=E2=80=9D (aka unicast-based). It is not clear how the text in =
this
>> document applies to hashing based selection, and I don=E2=80=99t see how=
 the text
>> applies to unicast-based selection. Some rewording/clarification are nee=
ded
>> here.
>>
>> GIM>> How would the use of an alternative UMH selection algorithm change
>> documented use of p2mp BFD? Do you think that if the Upstream PE selecte=
d
>> using, for example, hashing then defined use of BGP-BFD and p2mp BFD its=
elf
>> no longer applicable?
>>
>>
>>
>> Zzh> It=E2=80=99s not that the alternative UMH selection algorithm chang=
e
>> documented use of p2mp BFD. It=E2=80=99s the other way around =E2=80=93 =
tunnel state
>> changes the selection result. I guess hashing can still be used (this
>> document only controls what goes into the candidate pool). For unicast
>> based selection I thought it=E2=80=99d no longer work, but then I notice=
d the
>> following:
>>
>>
>>
>>    o  second, the UMH candidates that advertise a PMSI bound to a tunnel
>>
>>       that is "down" -- these will thus be used as a last resort to
>>
>>       ensure a graceful fallback to the basic MVPN UMH selection
>>
>>       procedures in the hypothetical case where a false negative would
>>
>>       occur when determining the status of all tunnels
>>
>>
>>
>> Zzh> So this should still work, although Ideally, the PE advertising the
>> next best route should be considered before going to the last resort (of
>> using the PE advertising the best route but whose tunnel is down).
>>
>>
>>
>>    For P-tunnels of type P2MP MPLS-TE, the status of the P-tunnel is
>>
>>    considered up if one or more of the P2MP RSVP-TE LSPs, identified by
>>
>>    the P-tunnel Attribute, are in Up state.
>>
>>
>>
>> Why is =E2=80=9Cone or more of =E2=80=A6=E2=80=9D used in the above text=
?
>>
>> GIM>> Clariy "to the same PE"
>
>> GIM>> Would s/one or more of/at least one of/ address your concern?
>>
>>
>>
>> Zzh> Still confused. From the tunnel head, indeed it could send setup
>> multiple (sub-)LSPs, one for each leaf. From the egress point of view,
>> there is only one LSP for an egress PE, right?
>>
>>
>>
>>    If tracking of the P-tunnel by using a p2mp BFD session is to be
>>
>>    enabled after the P-tunnel has been already signaled, the the
>>
>>    procedure described above MUST be followed.
>>
>>
>>
>> What if the tracking is to be enabled before the P-tunnel has been
>> signaled? The text implies different behavior?
>>
>> GIM>> Not really, I guess. I think that the second sentence is important=
:
>>
>>    Note that x-PMSI A-D Route MUST be re-sent with exactly the same
>> attributes as before and
>>
>>    the BGP-BFD Attribute included.
>>
>>
>>
>> Zzh> In that case, how about changing the paragraph and the next one to
>> the following:
>>
>>
>>
>>    If tracking of the P-tunnel by using a p2mp BFD session is
>>
>>   enabled after the x-PMSI A-D route has been already advertised,
>>
>>    the x-PMSI A-D
>>
>>    Route MUST be re-sent with exactly the same attributes as before and
>>
>>    the BGP-BFD Attribute included.
>>
>>
>>
>>    If the x-PMSI A-D route is advertised with P-tunnel status tracked
>> using
>>
>>    the p2mp BFD session and it is desired to stop tracking P-tunnel
>>
>>    status using BFD, then:
>>
>>
>> GIM>> Agree
>
>
>> zzh> BTW, the same applies to 3.1.7 as well.
>>
> GIM>> Agree
>
>>
>>
>>    When such a procedure is used, in the context where fast restoration
>>
>>    mechanisms are used for the P-tunnels, leaf PEs should be configured
>>
>>    to wait before updating the UMH, to let the P-tunnel restoration
>>
>>    mechanism happen.  A configurable timer MUST be provided for this
>>
>>    purpose, and it is recommended to provide a reasonable default value
>>
>>    for this timer.
>>
>>
>>
>> What does =E2=80=9Csuch a procedure=E2=80=9D refers to?
>>
>> GIM>> Would s/When such a procedure is used/In such a scenario/
>>
>>
>>
>> Zzh> I looked at the surrounding (new) text:
>>
>>
>>
>>    If the Downstream PE's P-tunnel is already up, its state being
>>
>>    monitored by the p2mp BFD session, and the Downstream PE receives the
>>
>>    new x-PMSI A-D Route without the BGP-BFD Attribute, the Downstream
>>
>>    PE:
>>
>>
>>
>>    o  MUST accept the x-PMSI A-D Route;
>>
>>
>>
>>    o  MUST stop receiving BFD control packets for this p2mp BFD session;
>>
>>
>>
>>    o  SHOULD delete the p2mp BFD session associated with the P-tunnel;
>>
>>
>>
>>    o  SHOULD NOT switch the traffic to the Standby Upstream PE.
>>
>>
>>
>>    In such a scenario, in the context where fast restoration mechanisms
>>
>>    are used for the P-tunnels, leaf PEs should be configured to wait
>>
>>    before updating the UMH, to let the P-tunnel restoration mechanism
>>
>>    happen.
>>
> GIM>> Remove the last paragraph?
>
>>
>>
>> Zzh> Now I have the following two questions:
>>
>> Zzh> a) Should the =E2=80=9CMUST stop receiving BFD control packets for =
this
>> p2mp BFD session=E2=80=9D be removed? How would you =E2=80=9Cstop receiv=
ing BFD control
>> packets=E2=80=9D? Isn=E2=80=99t it implied by the next bullet point alre=
ady?
>>
>> Zzh> b) What does the last clause =E2=80=9Cto let the P-tunnel restorati=
on
>> mechanism happen=E2=80=9D mean? The scenario is that an x-PMSI route upd=
ate is
>> received w/o the BGP-BFD attribute =E2=80=93 where does the tunnel resto=
ration come
>> from?
>>
>>
>>
>> 3.1.7.  Per PE-CE link BFD Discriminator
>>
>>
>>
>>    The following approach is defined for the fast failover in response
>>
>>    to the detection of PE-CE link failures, in which UMH selection for a
>>
>>    given C-multicast route takes into account the state of the BFD
>>
>>    session associated with the state of the upstream PE-CE link.
>>
>>
>>
>> 3.1.7.1.  Upstream PE Procedures
>>
>>
>>
>>    For each protected PE-CE link, the upstream PE initiates a multipoint
>>
>>    BFD session [I-D.ietf-bfd-multipoint] as MultipointHead toward
>>
>>    downstream PEs.  A downstream PE monitors the state of the p2mp
>>
>>    session as MultipointTail and MAY interpret transition of the BFD
>>
>>    session into Down state as the indication of the associated PE-CE
>>
>>    link being down.
>>
>>
>>
>> Since the BFD packets are sent over the P2MP tunnel not the PE-CE link,
>> my understanding is that the BFD discriminator is still for the tunnel a=
nd
>> not tied to the PE-CE link; but different from the previous case, the ro=
ot
>> will stop sending BFD messages when it detects the PE-CE link failure. A=
s
>> far as the egress PEs are concerned, they don=E2=80=99t know if it is th=
e tunnel
>> failure or PE-CE link failure.
>>
>>
>>
>> If my understanding is correct, the wording should be changed.
>>
>> GIM>> There are other than stopping transmission of BFD control packets
>> ways to distinguish two conditions for the egress PE. For example, the
>> MultipointHead MAY set the State to AdminDown and continue sending BFD
>> control packets. If and when PE-CE link restored to Up, the MultipointHe=
ad
>> can set the state to Up in the BFD control packet.
>>
>>
>>
>>    =E2=80=A6  If the route to the
>>
>>    src/RP changes such that the RPF interface is changed to be a new PE-
>>
>>    CE interface, then the upstream PE will update the S-PMSI A-D route
>>
>>    with included BGP-BFD Attribute so that value of the BFD
>>
>>    Discriminator is associated with the new RPF link.
>>
>>
>>
>> If the RPF interface changes on the upstream PE, why should it update th=
e
>> route to send a new discriminator? As long as there is a new RPF interfa=
ce
>> couldn=E2=80=99t the upstream PE do nothing but start tracking the new R=
PF
>> interface?
>>
>> GIM>> I'll defer this one to Thomas and Rob.
>>
>>
>>
>> Zzh> I re-read section 3.1.6 and 3.1.7 and have more questions =F0=9F=98=
=8A
>>
>> Zzh> 3.1.6 seems to be about tracking tunnel itself while 3.1.7 is about
>> tracking PE-CE interfaces. From an egress point of view, (how) does it k=
now
>> if the discriminator is for the tunnel or for PE-CE interface 1 or PE-CE
>> interface 2? Does it even care? It seems to me that an egress PE would n=
ot
>> need to care. If so, why are there different procedures for 3.1.6/3.1.7 =
(at
>> least for the egress PE behavior)? Even for the upstream PE behavior,
>> shouldn=E2=80=99t 3.1.6.1 apply to 3.1.7 as well?
>>
> GIM>> Added the following text to the first paragraph of section 3.1.7:
> NEW TEXT:
> The mechanism to communicate the mapping between the PE-CE link
> and the associated BFD session is outside the scope of this document.
>
>>
>>
>> Regardless which way (the currently described way and my imagined way),
>> some text should be added to discuss how the downstream would not switch=
 to
>> another upstream PE when the primary PE is just going through a RPF chan=
ge.
>>
>> GIM>>  Would appending the following text be acceptable to address your
>> concern:
>>
>> NEW TEXT:
>>
>>    To avoid unwarranted switchover a downstream PE MUST gracefully handl=
e
>> the
>>
>>    updated S-PMSI A-D route and switch to the use of the associated BFD
>>
>>    Discriminator value.
>>
>>
>>
>> 4.  Standby C-multicast route
>>
>>
>>
>>    The procedures described below are limited to the case where the site
>>
>>    that contains C-S is connected to exactly two PEs. The procedures
>>
>>    require all the PEs of that MVPN to follow the single forwarder PE
>>
>>    selection, as specified in [RFC6513].
>>
>>
>>
>>
>>
>> Why would it not work with more than two upstream PEs?
>>
>> Why is it limited to single forwarder selection? What about unicast base=
d
>> selection?
>>
>> GIM>> Again, asking for Thomas and Rob to help.
>>
>>
>>
>>    If at some later point the local PE determines that C-S is no longer
>>
>>    reachable through the Primary Upstream PE, the Standby Upstream PE
>>
>>    becomes the Upstream PE, and the local PE re-sends the C-multicast
>>
>>    route with RT that identifies the Standby Upstream PE, except that
>>
>>    now the route does not carry the Standby PE BGP Community (which
>>
>>    results in replacing the old route with a new route, with the only
>>
>>    difference between these routes being the presence/absence of the
>>
>>    Standby PE BGP Community).
>>
>>
>>
>> Additionally the LOCAL_PREF should also change?
>>
>> GIM>> Like normative SHOULD?
>>
>>
>>
>> Zzh> I meant that there should also be text talking about changing
>> LOCAL_PREF.
>>
> GIM>> Added to the paragraph:
> NEW TEXT:
> Also, a LOCAL_PREF attribute MUST be set to zero.
>
>> 5.  Hot leaf standby
>>
>>
>>
>>    The mechanisms defined in sections Section 4 and Section 3 can be
>>
>>    used together as follows.
>>
>>
>>
>> This section is a little confusing to me. It seems that it really should
>> be how a leaf should behave when hot root standby is used, not that ther=
e
>> is a =E2=80=9Chot leaf=E2=80=9D mode. A leaf is just a leaf, not a
>> cold/warm/hot/primary/standby leaf.
>>
>> GIM>> Would re-naming the section to "Use of Standby C-multicast Route" =
better
>> reflect the content of the section?
>>
>>
>>
>> Zzh> It seems to me that the title should really be changed to =E2=80=9C=
Hot Root
>> Standby=E2=80=9D. Bob/Thomas?
>>
> GIM>> Agree
>
>>
>>
>> Zzh> Thanks!
>>
>> Zzh> Jeffrey
>>
>>
>>
>> Thanks.
>>
>>
>>
>> Jeffrey
>>
>>
>>
>> *From:* BESS <bess-bounces@ietf.org> *On Behalf Of *
>> stephane.litkowski@orange.com
>> *Sent:* Thursday, November 22, 2018 2:54 AM
>> *To:* bess@ietf.org
>> *Cc:* bess-chairs@ietf.org
>> *Subject:* [bess] WGLC, IPR and implementation poll for
>> draft-ietf-bess-mvpn-fast-failover
>>
>>
>>
>> Hello Working Group,
>>
>>
>>
>> This email starts a two-week Working Group Last Call on
>> draft-ietf-bess-mvpn-fast-failover-04  [1]
>>
>>
>>
>> This poll runs until *the 6th of December*.
>>
>>
>>
>> We are also polling for knowledge of any undisclosed IPR that applies to
>> this Document, to ensure that IPR has been disclosed in compliance with
>> IETF IPR rules (see RFCs 3979, 4879, 3669 and 5378 for more details).
>>
>> If you are listed as an Author or a Contributor of this Document please
>> respond to this email and indicate whether or not you are aware of any
>> relevant undisclosed IPR. The Document won't progress without answers fr=
om
>> all the Authors and Contributors.
>>
>>
>>
>> Currently two IPRs have been disclosed against this Document.
>>
>>
>>
>> If you are not listed as an Author or a Contributor, then please
>> explicitly respond only if you are aware of any IPR that has not yet bee=
n
>> disclosed in conformance with IETF rules.
>>
>>
>>
>> We are also polling for any existing implementation as per [2].
>>
>>
>>
>>     Thank you,
>>
>>     Stephane & Matthew
>>
>>
>>
>>     [1]
>> https://datatracker.ietf.org/doc/draft-ietf-bess-mvpn-fast-failover/
>> <https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__datatracker.ietf=
.org_doc_draft-2Dietf-2Dbess-2Dmvpn-2Dfast-2Dfailover_&d=3DDwMFAg&c=3DHAkYu=
h63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=3Df7wsLGcfzAWDNS6XNTBZwj_OLAOsZZqd=
rR2IDAzeZqE&m=3D21UeMvv2ofELpScacCIlRV64tml5G3zQ3NN5NqhC90s&s=3DZKwzFkFZdTK=
GHJdgRZ6PExBQcl1Ck5CGjhXDxYQYvvI&e=3D>
>>
>>
>>
>>     [2]
>> https://mailarchive.ietf.org/arch/msg/bess/cG3X1tTqb_vPC4rg56SEdkjqDpw
>> <https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__mailarchive.ietf=
.org_arch_msg_bess_cG3X1tTqb-5FvPC4rg56SEdkjqDpw&d=3DDwMFAg&c=3DHAkYuh63rsu=
hr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=3Df7wsLGcfzAWDNS6XNTBZwj_OLAOsZZqdrR2IDA=
zeZqE&m=3D21UeMvv2ofELpScacCIlRV64tml5G3zQ3NN5NqhC90s&s=3DfR1eK_EmnRha7QRf3=
7WKaJmt1F5OLq7ynG7afcmPhM0&e=3D>
>>
>>
>>
>>
>>
>> ________________________________________________________________________=
_________________________________________________
>>
>>
>>
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--000000000000f5017705875d0334
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Jeffrey,<div>much appreciate your review and the feedba=
ck on the proposed changes based on our discussion in Prague.</div><div><br=
></div><div>Regards,</div><div>Greg</div></div><br><div class=3D"gmail_quot=
e"><div dir=3D"ltr" class=3D"gmail_attr">On Thu, Apr 4, 2019 at 4:04 PM Gre=
g Mirsky &lt;<a href=3D"mailto:gregimirsky@gmail.com">gregimirsky@gmail.com=
</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:=
0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">=
<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div>Hi Jeffrey,</div><d=
iv>many thanks to you and Sandy for taking the time to review the remaining=
 questions in Prague. Attached please find the updated version -06 and its =
diff to highlight the latest changes.</div><div><br></div><div>Regards,</di=
v><div>Greg</div><br><div class=3D"gmail_quote"><div dir=3D"ltr" class=3D"g=
mail_attr">On Thu, Mar 14, 2019 at 3:04 AM Jeffrey (Zhaohui) Zhang &lt;<a h=
ref=3D"mailto:zzhang@juniper.net" target=3D"_blank">zzhang@juniper.net</a>&=
gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0=
px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">







<div lang=3D"EN-US">
<div class=3D"gmail-m_-5999670062401018701gmail-m_-7076389122595309638gmail=
-m_-3405373157246802274WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
Thomas, Bob,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
Some questions below for you. Some old, and some new.<u></u><u></u></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
Greg,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
Sorry for the late response.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
Please see <span class=3D"gmail-m_-5999670062401018701gmail-m_-707638912259=
5309638gmail-m_-3405373157246802274SpellE">zzh</span>&gt; below. I trimmed =
some points that we agree on.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<div style=3D"border-top:none;border-right:none;border-bottom:none;border-l=
eft:1.5pt solid blue;padding:0in 0in 0in 4pt">
<div>
<div style=3D"border-right:none;border-bottom:none;border-left:none;border-=
top:1pt solid rgb(225,225,225);padding:3pt 0in 0in">
<p class=3D"MsoNormal"><b><span>From:</span></b><span> Greg Mirsky &lt;<a h=
ref=3D"mailto:gregimirsky@gmail.com" target=3D"_blank">gregimirsky@gmail.co=
m</a>&gt; <br>
<b>Sent:</b> Wednesday, December 5, 2018 1:38 PM<br>
<b>To:</b> Jeffrey (Zhaohui) Zhang &lt;<a href=3D"mailto:zzhang@juniper.net=
" target=3D"_blank">zzhang@juniper.net</a>&gt;<br>
<b>Cc:</b> EXT - <a href=3D"mailto:thomas.morin@orange.com" target=3D"_blan=
k">thomas.morin@orange.com</a> &lt;<a href=3D"mailto:thomas.morin@orange.co=
m" target=3D"_blank">thomas.morin@orange.com</a>&gt;; Robert Kebler &lt;<a =
href=3D"mailto:rkebler@juniper.net" target=3D"_blank">rkebler@juniper.net</=
a>&gt;; <a href=3D"mailto:bess-chairs@ietf.org" target=3D"_blank">bess-chai=
rs@ietf.org</a>; BESS &lt;<a href=3D"mailto:bess@ietf.org" target=3D"_blank=
">bess@ietf.org</a>&gt;<br>
<b>Subject:</b> Re: [bess] WGLC, IPR and implementation poll for draft-ietf=
-bess-mvpn-fast-failover<u></u><u></u></span></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div>
<div>
<div>
<div>
<div>
<p class=3D"MsoNormal">Hi Jeffrey,<u></u><u></u></p>
<div>
<p class=3D"MsoNormal">thank you for the review, detailed questions=C2=A0an=
d helpful comments. Please find my notes, answers in-line tagged GIM&gt;&gt=
;.<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Regards,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">Greg<u></u><u></u></p>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal">On Fri, Nov 30, 2018 at 5:14 PM Jeffrey (Zhaohui) Zh=
ang &lt;<a href=3D"mailto:zzhang@juniper.net" target=3D"_blank">zzhang@juni=
per.net</a>&gt; wrote:<u></u><u></u></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
Hi,</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
I have the following questions/comments:</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 The procedure described here is an =
OPTIONAL procedure that consists</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 of having a downstream PE take into=
 account the status of P-tunnels</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 rooted at each possible upstream PE=
s, for including or not including</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 each given PE in the list of candid=
ate UMHs for a given (C-S,C-G)</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 state.=C2=A0 The result is that, if=
 a P-tunnel is &quot;down&quot; (see</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 Section 3.1), the PE that is the ro=
ot of the P-tunnel will not be</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 considered for UMH selection, which=
 will result in the downstream PE</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 to failover to the upstream PE whic=
h is next in the list of</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 candidates.</span><u></u><u></u></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
Is it possible that a p2mp tunnel is considered up by some leaves but down =
by some other leaves, leaving to them choosing different UMH? In that case,=
 procedures described in Section 9.1.1 (&quot;Discarding Packets from Wrong=
 PE&quot;) of RFC 6513 must be used. I see that this is actually pointed ou=
t later in section 6 =E2=80=93 good to have a pointer to it right here.</sp=
an><u></u><u></u></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal">GIM&gt;&gt; Would the following new text that follow=
s the quoted text address your concern:<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">NEW TEXT:=C2=A0<u></u><u></u></p>
</div>
<div>
<div>
<p class=3D"MsoNormal">=C2=A0 =C2=A0If rules to determine the state of the =
P-tunnel are not<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0 =C2=A0consistent across all PEs, then some ma=
y arrive at a different<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0 =C2=A0conclusion regarding the state of the t=
unnel, In such a scenario,<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0 =C2=A0procedures described in Section 9.1.1 o=
f [RFC 6513] MUST be used</p></div></div></div></div></div></div></div></di=
v></div></div></div></div></blockquote><div>=C2=A0</div><blockquote class=
=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rg=
b(204,204,204);padding-left:1ex"><div lang=3D"EN-US"><div class=3D"gmail-m_=
-5999670062401018701gmail-m_-7076389122595309638gmail-m_-340537315724680227=
4WordSection1"><div style=3D"border-top:none;border-right:none;border-botto=
m:none;border-left:1.5pt solid blue;padding:0in 0in 0in 4pt"><div><div><div=
><div><div><div><div><div><div><p class=3D"MsoNormal">GIM&gt;&gt; Accepted<=
/p></div></div></div></div></div></div></div></div></div></div></div></div>=
</blockquote><div><br></div><div>=C2=A0</div><blockquote class=3D"gmail_quo=
te" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204=
);padding-left:1ex"><div lang=3D"EN-US"><div class=3D"gmail-m_-599967006240=
1018701gmail-m_-7076389122595309638gmail-m_-3405373157246802274WordSection1=
"><div style=3D"border-top:none;border-right:none;border-bottom:none;border=
-left:1.5pt solid blue;padding:0in 0in 0in 4pt"><div><div><div><div><div><d=
iv><div><div><div>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-5999670062401018701gmail-m_-=
7076389122595309638gmail-m_-3405373157246802274SpellE"><span style=3D"font-=
size:12pt;color:rgb(31,73,125)">Zzh</span></span><span style=3D"font-size:1=
2pt;color:rgb(31,73,125)">&gt; It=E2=80=99s not that the =E2=80=9Crules =E2=
=80=A6 are not consistent=E2=80=9D. It=E2=80=99s that by nature some PEs ma=
y think the tunnel is down while the others may think the tunnel is still u=
p (because they=E2=80=99re on different tunnel branches), even when they fo=
llow the same rules. Traffic duplication in this case is also only with inc=
lusive tunnels =E2=80=93 so how about the following?<u></u><u></u></span></=
p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal">=C2=A0 =C2=A0Because all PEs may arrive at a differe=
nt<u></u><u></u></p>
<p class=3D"MsoNormal">=C2=A0 =C2=A0conclusion regarding the state of the t=
unnel,<u></u><u></u></p>
<p class=3D"MsoNormal">=C2=A0 =C2=A0procedures described in Section 9.1.1 o=
f [RFC 6513] MUST be used<u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<span>=C2=A0 </span><span>=C2=A0</span></span><span style=3D"font-size:12pt=
">when using inclusive tunnels.<u></u><u></u></span></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:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
Additionally, the text in section 3 seems to be more biased on Single Forwa=
rder Election choosing the UMH with the highest IP address. Section 5 of RF=
C6513 also describes two other options, hashing or based on =E2=80=9Cinstal=
led UMH route=E2=80=9D (aka unicast-based). It is not clear how the text in=
 this document applies to hashing based selection, and I don=E2=80=99t see =
how the text applies to unicast-based selection. Some rewording/clarificati=
on are needed here.</span><u></u><u></u></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal">GIM&gt;&gt; How would the use of an alternative UMH =
selection algorithm change documented use of p2mp BFD? Do you think that if=
 the Upstream PE selected using, for example, hashing then defined use of B=
GP-BFD and p2mp BFD itself no longer applicable?<u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-5999670062401018701gmail-m_-=
7076389122595309638gmail-m_-3405373157246802274SpellE"><span style=3D"font-=
size:12pt;color:rgb(31,73,125)">Zzh</span></span><span style=3D"font-size:1=
2pt;color:rgb(31,73,125)">&gt; It=E2=80=99s not that the alternative UMH se=
lection algorithm change documented use of p2mp BFD. It=E2=80=99s the other=
 way around =E2=80=93 tunnel state changes the selection result. I guess ha=
shing can still be used (this document only controls what goes into the can=
didate pool). For unicast based selection I thought it=E2=80=99d no longer =
work, but then I noticed the following:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>o<span>=C2=A0 </span>second, the UMH candidat=
es that advertise a PMSI bound to a tunnel<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 </span>that is &quot;down&quot; --=
 these will thus be used as a last resort to<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 </span>ensure a graceful fallback =
to the basic MVPN UMH selection<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 </span>procedures in the hypotheti=
cal case where a false negative would<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 </span>occur when determining the =
status of all tunnels<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-5999670062401018701gmail-m_-=
7076389122595309638gmail-m_-3405373157246802274SpellE"><span style=3D"font-=
size:12pt;color:rgb(31,73,125)">Zzh</span></span><span style=3D"font-size:1=
2pt;color:rgb(31,73,125)">&gt; So this should still work, although Ideally,=
 the PE advertising the next best route should be considered before going t=
o the last resort (of using the PE advertising the best route but whose tun=
nel is down).<u></u><u></u></span></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 For P-tunnels of type P2MP MPLS-TE,=
 the status of the P-tunnel is</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 considered up if one or more of the=
 P2MP RSVP-TE LSPs, identified by</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 the P-tunnel Attribute, are in Up s=
tate. </span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
Why is =E2=80=9Cone or more of =E2=80=A6=E2=80=9D used in the above text?</=
span></p></div></div></blockquote></div></div></div></div></div></div></div=
></div></div></div></blockquote><div>GIM&gt;&gt; Clariy &quot;to the same P=
E&quot;=C2=A0</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 l=
ang=3D"EN-US"><div class=3D"gmail-m_-5999670062401018701gmail-m_-7076389122=
595309638gmail-m_-3405373157246802274WordSection1"><div style=3D"border-top=
:none;border-right:none;border-bottom:none;border-left:1.5pt solid blue;pad=
ding:0in 0in 0in 4pt"><div><div><div><div><div><div><div><blockquote style=
=3D"border-top:none;border-right:none;border-bottom:none;border-left:1pt so=
lid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4.8pt;margin-right=
:0in"><div><div><p class=3D"MsoNormal"><u></u><u></u></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal">GIM&gt;&gt; Would s/one or more of/at least one of/ =
address your concern?=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-5999670062401018701gmail-m_-=
7076389122595309638gmail-m_-3405373157246802274SpellE"><span style=3D"font-=
size:12pt;color:rgb(31,73,125)">Zzh</span></span><span style=3D"font-size:1=
2pt;color:rgb(31,73,125)">&gt; Still confused. From the tunnel head, indeed=
 it could send setup multiple (sub-)LSPs, one for each leaf. From the egres=
s point of view, there is only one LSP for an egress PE, right?<u></u><u></=
u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 If tracking of the P-tunnel by usin=
g a p2mp BFD session is to be</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 enabled after the P-tunnel has been=
 already signaled, the the</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 procedure described above MUST be f=
ollowed.</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,78,121)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,78,121)">=
What if the tracking is to be enabled before the P-tunnel has been signaled=
? The text implies different behavior?</span><u></u><u></u></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal">GIM&gt;&gt; Not really, I guess. I think that the se=
cond sentence is important:<u></u><u></u></p>
</div>
<div>
<div>
<p class=3D"MsoNormal">=C2=A0 =C2=A0Note that x-PMSI A-D Route MUST be re-s=
ent with exactly the same attributes as before and<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0 =C2=A0the BGP-BFD Attribute included.<u></u><=
u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-5999670062401018701gmail-m_-=
7076389122595309638gmail-m_-3405373157246802274SpellE"><span style=3D"font-=
size:12pt;color:rgb(31,73,125)">Zzh</span></span><span style=3D"font-size:1=
2pt;color:rgb(31,73,125)">&gt; In that case, how about changing the paragra=
ph and the next one to the following:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>If tracking of the P-tunnel by using a p2mp B=
FD session is<u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:4.8pt">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0 </span>enabled after the x-PMSI A-D route has been already=
 advertised,<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>the x-PMSI A-D<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>Route MUST be re-sent with exactly the same a=
ttributes as before and<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>the BGP-BFD Attribute included.<u></u><u></u>=
</span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>If the x-PMSI A-D route is advertised with P-=
tunnel status tracked using<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>the p2mp BFD session and it is desired to sto=
p tracking P-tunnel<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>status using BFD, then:<u></u><u></u></span><=
/p>
<p class=3D"MsoNormal"><br></p></div></div></div></div></div></div></div></=
div></div></div></div></div></blockquote><div>GIM&gt;&gt; Agree</div><div>=
=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0=
.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang=3D"=
EN-US"><div class=3D"gmail-m_-5999670062401018701gmail-m_-70763891225953096=
38gmail-m_-3405373157246802274WordSection1"><div style=3D"border-top:none;b=
order-right:none;border-bottom:none;border-left:1.5pt solid blue;padding:0i=
n 0in 0in 4pt"><div><div><div><div><div><div><div><div><div><p class=3D"Mso=
Normal"></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-5999670062401018701gmail-m_-=
7076389122595309638gmail-m_-3405373157246802274SpellE"><span style=3D"font-=
size:12pt;color:rgb(31,73,125)">zzh</span></span><span style=3D"font-size:1=
2pt;color:rgb(31,73,125)">&gt; BTW, the same applies to 3.1.7 as well.</spa=
n></p></div></div></div></div></div></div></div></div></div></div></div></d=
iv></blockquote><div>GIM&gt;&gt; Agree=C2=A0</div><blockquote class=3D"gmai=
l_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,20=
4,204);padding-left:1ex"><div lang=3D"EN-US"><div class=3D"gmail-m_-5999670=
062401018701gmail-m_-7076389122595309638gmail-m_-3405373157246802274WordSec=
tion1"><div style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1.5pt solid blue;padding:0in 0in 0in 4pt"><div><div><div><div><d=
iv><div><div><div><div><p class=3D"MsoNormal"><span style=3D"font-size:12pt=
;color:rgb(31,73,125)"><u></u><u></u></span></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:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 When such a procedure is used, in t=
he context where fast restoration</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 mechanisms are used for the P-tunne=
ls, leaf PEs should be configured</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 to wait before updating the UMH, to=
 let the P-tunnel restoration</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 mechanism happen.=C2=A0 A configura=
ble timer MUST be provided for this</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 purpose, and it is recommended to p=
rovide a reasonable default value</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 for this timer.</span><u></u><u></u=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
What does =E2=80=9Csuch a procedure=E2=80=9D refers to?</span><u></u><u></u=
></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal">GIM&gt;&gt; Would s/When such a procedure is used/In=
 such a scenario/<u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-5999670062401018701gmail-m_-=
7076389122595309638gmail-m_-3405373157246802274SpellE"><span style=3D"font-=
size:12pt;color:rgb(31,73,125)">Zzh</span></span><span style=3D"font-size:1=
2pt;color:rgb(31,73,125)">&gt; I looked at the surrounding (new) text:<u></=
u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>If the Downstream PE&#39;s P-tunnel is alread=
y up, its state being<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>monitored by the p2mp BFD session, and the Do=
wnstream PE receives the<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>new x-PMSI A-D Route without the BGP-BFD Attr=
ibute, the Downstream<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>PE:<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>o<span>=C2=A0 </span>MUST accept the x-PMSI A=
-D Route;<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>o<span>=C2=A0 </span></span><span style=3D"fo=
nt-size:10pt;font-family:&quot;Courier New&quot;;color:red">MUST stop recei=
ving BFD control packets for this p2mp BFD session;<u></u><u></u></span></p=
>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>o<span>=C2=A0 </span>SHOULD delete the p2mp B=
FD session associated with the P-tunnel;<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>o<span>=C2=A0 </span>SHOULD NOT switch the tr=
affic to the Standby Upstream PE.<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>In such a scenario, in the context where fast=
 restoration mechanisms<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>are used for the P-tunnels, leaf PEs should b=
e configured to wait<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:bla=
ck"><span>=C2=A0=C2=A0 </span>before updating the UMH, </span><span style=
=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:red">to let th=
e P-tunnel restoration mechanism<u></u><u></u></span></p>
<p class=3D"MsoNormal">
<span style=3D"font-size:10pt;font-family:&quot;Courier New&quot;;color:red=
"><span>=C2=A0=C2=A0 </span>happen.<span>=C2=A0</span></span></p></div></di=
v></div></div></div></div></div></div></div></div></div></blockquote><div>G=
IM&gt;&gt; Remove the last paragraph?=C2=A0</div><blockquote class=3D"gmail=
_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204=
,204);padding-left:1ex"><div lang=3D"EN-US"><div class=3D"gmail-m_-59996700=
62401018701gmail-m_-7076389122595309638gmail-m_-3405373157246802274WordSect=
ion1"><div style=3D"border-top:none;border-right:none;border-bottom:none;bo=
rder-left:1.5pt solid blue;padding:0in 0in 0in 4pt"><div><div><div><div><di=
v><div><div><div><p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-=
family:&quot;Courier New&quot;;color:red"><span> </span><u></u><u></u></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-5999670062401018701gmail-m_-=
7076389122595309638gmail-m_-3405373157246802274SpellE"><span style=3D"font-=
size:12pt;color:rgb(31,73,125)">Zzh</span></span><span style=3D"font-size:1=
2pt;color:rgb(31,73,125)">&gt; Now I have the following two questions:<u></=
u><u></u></span></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-5999670062401018701gmail-m_-=
7076389122595309638gmail-m_-3405373157246802274SpellE"><span style=3D"font-=
size:12pt;color:rgb(31,73,125)">Zzh</span></span><span style=3D"font-size:1=
2pt;color:rgb(31,73,125)">&gt; a) Should the =E2=80=9C</span><span style=3D=
"font-size:10pt;font-family:&quot;Courier New&quot;;color:black">MUST stop =
receiving BFD control packets for this p2mp BFD session=E2=80=9D</span><spa=
n style=3D"font-size:12pt;color:rgb(32,56,100)"> be removed? How would you =
=E2=80=9Cstop receiving BFD control packets=E2=80=9D? Isn=E2=80=99t it impl=
ied by the next bullet point already?<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-5999670062401018701gmail-m_-=
7076389122595309638gmail-m_-3405373157246802274SpellE"><span style=3D"font-=
size:12pt;color:rgb(32,56,100)">Zzh</span></span><span style=3D"font-size:1=
2pt;color:rgb(32,56,100)">&gt; b) What does the last clause =E2=80=9Cto let=
 the P-tunnel restoration mechanism happen=E2=80=9D mean? The scenario is t=
hat an x-PMSI route update is received w/o the BGP-BFD attribute =E2=80=93 =
where does the tunnel restoration come from?</span><span style=3D"font-size=
:12pt;color:rgb(32,56,100)"><u></u><u></u></span></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">3.1.7.=C2=A0 Per PE-CE link BFD Discriminator</s=
pan><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 The following approach is defined f=
or the fast failover in response</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 to the detection of PE-CE link fail=
ures, in which UMH selection for a</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 given C-multicast route takes into =
account the state of the BFD</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 session associated with the state o=
f the upstream PE-CE link.</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">3.1.7.1.=C2=A0 Upstream PE Procedures</span><u><=
/u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 For each protected PE-CE link, the =
upstream PE initiates a multipoint</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 BFD session [I-D.ietf-bfd-multipoin=
t] as MultipointHead toward</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 downstream PEs.=C2=A0 A downstream =
PE monitors the state of the p2mp</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 session as MultipointTail and MAY i=
nterpret transition of the BFD</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 session into Down state as the indi=
cation of the associated PE-CE</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 link being down.</span><u></u><u></=
u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,78,121)">=
Since the BFD packets are sent over the P2MP tunnel not the PE-CE link, my =
understanding is that the BFD discriminator is still for the tunnel and not=
 tied to the PE-CE link; but different from the previous case, the root wil=
l stop sending BFD messages when it detects the PE-CE link failure. As far =
as the egress PEs are concerned, they don=E2=80=99t know if it is the tunne=
l failure or PE-CE link failure.</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,78,121)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,78,121)">=
If my understanding is correct, the wording should be changed.</span><u></u=
><u></u></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal">GIM&gt;&gt; There are other than stopping transmissi=
on of BFD control packets ways to distinguish two conditions for the egress=
 PE. For example, the MultipointHead MAY set the State to AdminDown and con=
tinue sending BFD control packets. If and when PE-CE link restored to Up, t=
he MultipointHead can set the state to Up in the BFD control packet.<u></u>=
<u></u></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,78,121)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 =E2=80=A6=C2=A0 If the route to the=
</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 src/RP changes such that the RPF in=
terface is changed to be a new PE-</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 CE interface, then the upstream PE =
will update the S-PMSI A-D route</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 with included BGP-BFD Attribute so =
that value of the BFD</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 Discriminator is associated with th=
e new RPF link.</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
If the RPF interface changes on the upstream PE, why should it update the r=
oute to send a new discriminator? As long as there is a new RPF interface c=
ouldn=E2=80=99t the upstream PE do nothing but start tracking the new RPF i=
nterface?</span><u></u><u></u></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal">GIM&gt;&gt; I&#39;ll defer this one to Thomas and Ro=
b.<u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-5999670062401018701gmail-m_-=
7076389122595309638gmail-m_-3405373157246802274SpellE"><span style=3D"font-=
size:12pt;color:rgb(31,73,125)">Zzh</span></span><span style=3D"font-size:1=
2pt;color:rgb(31,73,125)">&gt; I re-read section 3.1.6 and 3.1.7 and have m=
ore questions </span><span style=3D"font-size:12pt;font-family:&quot;Segoe =
UI Emoji&quot;,sans-serif;color:rgb(31,73,125)">=F0=9F=98=8A</span><span st=
yle=3D"font-size:12pt;color:rgb(31,73,125)"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-5999670062401018701gmail-m_-=
7076389122595309638gmail-m_-3405373157246802274SpellE"><span style=3D"font-=
size:12pt;color:rgb(31,73,125)">Zzh</span></span><span style=3D"font-size:1=
2pt;color:rgb(31,73,125)">&gt; 3.1.6 seems to be about tracking tunnel itse=
lf while 3.1.7 is about tracking PE-CE interfaces. From an egress point of =
view, (how) does it know if the discriminator is for the tunnel or for PE-C=
E interface 1 or PE-CE interface 2? Does it even care? It seems to me that =
an egress PE would not need to care. If so, why are there different procedu=
res for 3.1.6/3.1.7 (at least for the egress PE behavior)? Even for the ups=
tream PE behavior, shouldn=E2=80=99t 3.1.6.1 apply to 3.1.7 as well?</span>=
</p></div></div></div></div></div></div></div></div></div></div></div></blo=
ckquote><div>GIM&gt;&gt; Added the following text to the first paragraph of=
 section 3.1.7:</div><div>NEW TEXT:</div><div><div>The mechanism to communi=
cate the mapping between the PE-CE link</div><div>and the associated BFD se=
ssion is outside the scope of this document.</div></div><blockquote class=
=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid rg=
b(204,204,204);padding-left:1ex"><div lang=3D"EN-US"><div class=3D"gmail-m_=
-5999670062401018701gmail-m_-7076389122595309638gmail-m_-340537315724680227=
4WordSection1"><div style=3D"border-top:none;border-right:none;border-botto=
m:none;border-left:1.5pt solid blue;padding:0in 0in 0in 4pt"><div><div><div=
><div><div><div><div><div><p class=3D"MsoNormal"><span style=3D"font-size:1=
2pt;color:rgb(31,73,125)"><u></u><u></u></span></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
Regardless which way (the currently described way and my imagined way), som=
e text should be added to discuss how the downstream would not switch to an=
other upstream PE when the primary PE is just going through a RPF change.</=
span><u></u><u></u></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal">GIM&gt;&gt;=C2=A0 Would appending the following text=
 be acceptable to address your concern:<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">NEW TEXT:<u></u><u></u></p>
</div>
<div>
<div>
<p class=3D"MsoNormal">=C2=A0 =C2=A0To avoid unwarranted switchover a downs=
tream PE MUST gracefully handle the<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0 =C2=A0updated S-PMSI A-D route and switch to =
the use of the associated BFD<u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal">=C2=A0 =C2=A0Discriminator value.<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:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">4.=C2=A0 Standby C-multicast route</span><u></u>=
<u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 The procedures described below are =
limited to the case where the site</span><u></u><u></u></p>
<pre><span style=3D"color:black">=C2=A0=C2=A0 that contains C-S is connecte=
d to exactly two PEs. The procedures</span><u></u><u></u></pre>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 require all the PEs of that MVPN to=
 follow the single forwarder PE</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 selection, as specified in [RFC6513=
].=C2=A0 </span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
Why would it not work with more than two upstream PEs?</span><u></u><u></u>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
Why is it limited to single forwarder selection? What about unicast based s=
election?</span><u></u><u></u></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal">GIM&gt;&gt; Again, asking for Thomas and Rob to help=
.=C2=A0<u></u><u></u></p>
</div>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 If at some later point the local PE=
 determines that C-S is no longer</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 reachable through the Primary Upstr=
eam PE, the Standby Upstream PE</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 becomes the Upstream PE, and the lo=
cal PE re-sends the C-multicast</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 route with RT that identifies the S=
tandby Upstream PE, except that</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 now the route does not carry the St=
andby PE BGP Community (which</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 results in replacing the old route =
with a new route, with the only</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 difference between these routes bei=
ng the presence/absence of the</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 Standby PE BGP Community).</span><u=
></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
Additionally the LOCAL_PREF should also change?</span><u></u><u></u></p>
</div>
</div>
</div>
<div>
<p class=3D"MsoNormal">GIM&gt;&gt; Like normative SHOULD?=C2=A0<u></u><u></=
u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-5999670062401018701gmail-m_-=
7076389122595309638gmail-m_-3405373157246802274SpellE"><span style=3D"font-=
size:12pt;color:rgb(31,73,125)">Zzh</span></span><span style=3D"font-size:1=
2pt;color:rgb(31,73,125)">&gt; I meant that there should also be text talki=
ng about changing LOCAL_PREF.</span></p></div></div></div></div></div></div=
></div></div></blockquote><div>GIM&gt;&gt; Added to the paragraph:</div><di=
v>NEW TEXT:</div><div>Also, a LOCAL_PREF attribute MUST be set to zero.<br>=
</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;b=
order-left:1px solid rgb(204,204,204);padding-left:1ex"><div lang=3D"EN-US"=
><div class=3D"gmail-m_-5999670062401018701gmail-m_-7076389122595309638gmai=
l-m_-3405373157246802274WordSection1"><div style=3D"border-top:none;border-=
right:none;border-bottom:none;border-left:1.5pt solid blue;padding:0in 0in =
0in 4pt"><div><div><div><div><div><p class=3D"MsoNormal"><span style=3D"fon=
t-size:12pt;color:rgb(31,73,125)"><u></u><u></u></span></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">5.=C2=A0 Hot leaf standby</span><u></u><u></u></=
p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 The mechanisms defined in sections =
Section 4 and Section 3 can be</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10pt;font-family:&quot;Cour=
ier New&quot;;color:black">=C2=A0=C2=A0 used together as follows.</span><u>=
</u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
This section is a little confusing to me. It seems that it really should be=
 how a leaf should behave when hot root standby is used, not that there is =
a =E2=80=9Chot leaf=E2=80=9D mode. A leaf is just a leaf, not a cold/warm/h=
ot/primary/standby leaf.</span><u></u><u></u></p>
</div>
</div>
</blockquote>
<div>
<p class=3D"MsoNormal">GIM&gt;&gt; Would re-naming the section to &quot;Use=
 of=C2=A0<span style=3D"font-size:10pt;color:black">Standby C-multicast Rou=
te&quot;</span>=C2=A0better reflect the content of the section?<u></u><u></=
u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-5999670062401018701gmail-m_-=
7076389122595309638gmail-m_-3405373157246802274SpellE"><span style=3D"font-=
size:12pt;color:rgb(31,73,125)">Zzh</span></span><span style=3D"font-size:1=
2pt;color:rgb(31,73,125)">&gt; It seems to me that the title should really =
be changed to =E2=80=9CHot Root Standby=E2=80=9D. Bob/Thomas?</span></p></d=
iv></div></div></div></div></div></div></div></blockquote><div>GIM&gt;&gt; =
Agree=C2=A0</div><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px =
0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div lan=
g=3D"EN-US"><div class=3D"gmail-m_-5999670062401018701gmail-m_-707638912259=
5309638gmail-m_-3405373157246802274WordSection1"><div style=3D"border-top:n=
one;border-right:none;border-bottom:none;border-left:1.5pt solid blue;paddi=
ng:0in 0in 0in 4pt"><div><div><div><div><div><p class=3D"MsoNormal"><span s=
tyle=3D"font-size:12pt;color:rgb(31,73,125)"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
<u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-5999670062401018701gmail-m_-=
7076389122595309638gmail-m_-3405373157246802274SpellE"><span style=3D"font-=
size:12pt;color:rgb(31,73,125)">Zzh</span></span><span style=3D"font-size:1=
2pt;color:rgb(31,73,125)">&gt; Thanks!<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span class=3D"gmail-m_-5999670062401018701gmail-m_-=
7076389122595309638gmail-m_-3405373157246802274SpellE"><span style=3D"font-=
size:12pt;color:rgb(31,73,125)">Zzh</span></span><span style=3D"font-size:1=
2pt;color:rgb(31,73,125)">&gt; Jeffrey<u></u><u></u></span></p>
</div>
<blockquote style=3D"border-top:none;border-right:none;border-bottom:none;b=
order-left:1pt solid rgb(204,204,204);padding:0in 0in 0in 6pt;margin-left:4=
.8pt;margin-right:0in">
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
Thanks.</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
Jeffrey</span><u></u><u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12pt;color:rgb(31,73,125)">=
=C2=A0</span><u></u><u></u></p>
<div style=3D"border-top:none;border-right:none;border-bottom:none;border-l=
eft:1.5pt solid blue;padding:0in 0in 0in 4pt">
<div>
<div style=3D"border-right:none;border-bottom:none;border-left:none;border-=
top:1pt solid rgb(225,225,225);padding:3pt 0in 0in">
<p class=3D"MsoNormal">
<b>From:</b> BESS &lt;<a href=3D"mailto:bess-bounces@ietf.org" target=3D"_b=
lank">bess-bounces@ietf.org</a>&gt; <b>On Behalf Of </b><a href=3D"mailto:s=
tephane.litkowski@orange.com" target=3D"_blank">stephane.litkowski@orange.c=
om</a><br>
<b>Sent:</b> Thursday, November 22, 2018 2:54 AM<br>
<b>To:</b> <a href=3D"mailto:bess@ietf.org" target=3D"_blank">bess@ietf.org=
</a><br>
<b>Cc:</b> <a href=3D"mailto:bess-chairs@ietf.org" target=3D"_blank">bess-c=
hairs@ietf.org</a><br>
<b>Subject:</b> [bess] WGLC, IPR and implementation poll for draft-ietf-bes=
s-mvpn-fast-failover<u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<p class=3D"gmail-m_-5999670062401018701gmail-m_-7076389122595309638gmail-m=
_-3405373157246802274gmail-m-3308390041763979650gmail-m-8796632855555630134=
msoplaintext">Hello Working Group,<u></u><u></u></p>
<p class=3D"gmail-m_-5999670062401018701gmail-m_-7076389122595309638gmail-m=
_-3405373157246802274gmail-m-3308390041763979650gmail-m-8796632855555630134=
msoplaintext">=C2=A0=C2=A0=C2=A0 <u></u><u></u></p>
<p class=3D"gmail-m_-5999670062401018701gmail-m_-7076389122595309638gmail-m=
_-3405373157246802274gmail-m-3308390041763979650gmail-m-8796632855555630134=
msoplaintext">This email starts a two-week Working Group Last Call on draft=
-ietf-bess-mvpn-fast-failover-04 =C2=A0[1]<u></u><u></u></p>
<p class=3D"gmail-m_-5999670062401018701gmail-m_-7076389122595309638gmail-m=
_-3405373157246802274gmail-m-3308390041763979650gmail-m-8796632855555630134=
msoplaintext">=C2=A0<u></u><u></u></p>
<p class=3D"gmail-m_-5999670062401018701gmail-m_-7076389122595309638gmail-m=
_-3405373157246802274gmail-m-3308390041763979650gmail-m-8796632855555630134=
msoplaintext">This poll runs until *the 6th of December*.<u></u><u></u></p>
<p class=3D"gmail-m_-5999670062401018701gmail-m_-7076389122595309638gmail-m=
_-3405373157246802274gmail-m-3308390041763979650gmail-m-8796632855555630134=
msoplaintext">=C2=A0<u></u><u></u></p>
<p class=3D"gmail-m_-5999670062401018701gmail-m_-7076389122595309638gmail-m=
_-3405373157246802274gmail-m-3308390041763979650gmail-m-8796632855555630134=
msoplaintext">We are also polling for knowledge of any undisclosed IPR that=
 applies to this Document, to ensure that IPR has been disclosed in complia=
nce with IETF IPR rules (see RFCs 3979, 4879, 3669 and 5378 for more detail=
s).<u></u><u></u></p>
<p class=3D"gmail-m_-5999670062401018701gmail-m_-7076389122595309638gmail-m=
_-3405373157246802274gmail-m-3308390041763979650gmail-m-8796632855555630134=
msoplaintext">If you are listed as an Author or a Contributor of this Docum=
ent please respond to this email and indicate whether or not you are aware =
of any relevant undisclosed IPR. The Document won&#39;t progress without an=
swers from all the Authors and Contributors.<u></u><u></u></p>
<p class=3D"gmail-m_-5999670062401018701gmail-m_-7076389122595309638gmail-m=
_-3405373157246802274gmail-m-3308390041763979650gmail-m-8796632855555630134=
msoplaintext">=C2=A0<u></u><u></u></p>
<p class=3D"gmail-m_-5999670062401018701gmail-m_-7076389122595309638gmail-m=
_-3405373157246802274gmail-m-3308390041763979650gmail-m-8796632855555630134=
msoplaintext">Currently two IPRs have been disclosed against this Document.=
<u></u><u></u></p>
<p class=3D"gmail-m_-5999670062401018701gmail-m_-7076389122595309638gmail-m=
_-3405373157246802274gmail-m-3308390041763979650gmail-m-8796632855555630134=
msoplaintext">=C2=A0<u></u><u></u></p>
<p class=3D"gmail-m_-5999670062401018701gmail-m_-7076389122595309638gmail-m=
_-3405373157246802274gmail-m-3308390041763979650gmail-m-8796632855555630134=
msoplaintext">If you are not listed as an Author or a Contributor, then ple=
ase explicitly respond only if you are aware of any IPR that has not yet be=
en disclosed in conformance with IETF rules.<u></u><u></u></p>
<p class=3D"gmail-m_-5999670062401018701gmail-m_-7076389122595309638gmail-m=
_-3405373157246802274gmail-m-3308390041763979650gmail-m-8796632855555630134=
msoplaintext">=C2=A0<u></u><u></u></p>
<p class=3D"gmail-m_-5999670062401018701gmail-m_-7076389122595309638gmail-m=
_-3405373157246802274gmail-m-3308390041763979650gmail-m-8796632855555630134=
msoplaintext">We are also polling for any existing implementation as per [2=
].<u></u><u></u></p>
<p class=3D"gmail-m_-5999670062401018701gmail-m_-7076389122595309638gmail-m=
_-3405373157246802274gmail-m-3308390041763979650gmail-m-8796632855555630134=
msoplaintext">=C2=A0=C2=A0=C2=A0 <u></u><u></u></p>
<p class=3D"gmail-m_-5999670062401018701gmail-m_-7076389122595309638gmail-m=
_-3405373157246802274gmail-m-3308390041763979650gmail-m-8796632855555630134=
msoplaintext">=C2=A0=C2=A0=C2=A0=C2=A0Thank you,<u></u><u></u></p>
<p class=3D"gmail-m_-5999670062401018701gmail-m_-7076389122595309638gmail-m=
_-3405373157246802274gmail-m-3308390041763979650gmail-m-8796632855555630134=
msoplaintext">=C2=A0=C2=A0=C2=A0 Stephane &amp; Matthew<u></u><u></u></p>
<p class=3D"gmail-m_-5999670062401018701gmail-m_-7076389122595309638gmail-m=
_-3405373157246802274gmail-m-3308390041763979650gmail-m-8796632855555630134=
msoplaintext">=C2=A0<u></u><u></u></p>
<p class=3D"gmail-m_-5999670062401018701gmail-m_-7076389122595309638gmail-m=
_-3405373157246802274gmail-m-3308390041763979650gmail-m-8796632855555630134=
msoplaintext">=C2=A0=C2=A0=C2=A0=C2=A0[1] <a href=3D"https://urldefense.pro=
ofpoint.com/v2/url?u=3Dhttps-3A__datatracker.ietf.org_doc_draft-2Dietf-2Dbe=
ss-2Dmvpn-2Dfast-2Dfailover_&amp;d=3DDwMFAg&amp;c=3DHAkYuh63rsuhr6Scbfh0UjB=
XeMK-ndb3voDTXcWzoCI&amp;r=3Df7wsLGcfzAWDNS6XNTBZwj_OLAOsZZqdrR2IDAzeZqE&am=
p;m=3D21UeMvv2ofELpScacCIlRV64tml5G3zQ3NN5NqhC90s&amp;s=3DZKwzFkFZdTKGHJdgR=
Z6PExBQcl1Ck5CGjhXDxYQYvvI&amp;e=3D" target=3D"_blank"> https://datatracker=
.ietf.org/doc/draft-ietf-bess-mvpn-fast-failover/</a><u></u><u></u></p>
<p class=3D"gmail-m_-5999670062401018701gmail-m_-7076389122595309638gmail-m=
_-3405373157246802274gmail-m-3308390041763979650gmail-m-8796632855555630134=
msoplaintext">=C2=A0<u></u><u></u></p>
<p class=3D"gmail-m_-5999670062401018701gmail-m_-7076389122595309638gmail-m=
_-3405373157246802274gmail-m-3308390041763979650gmail-m-8796632855555630134=
msoplaintext">=C2=A0=C2=A0=C2=A0 [2] <a href=3D"https://urldefense.proofpoi=
nt.com/v2/url?u=3Dhttps-3A__mailarchive.ietf.org_arch_msg_bess_cG3X1tTqb-5F=
vPC4rg56SEdkjqDpw&amp;d=3DDwMFAg&amp;c=3DHAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3vo=
DTXcWzoCI&amp;r=3Df7wsLGcfzAWDNS6XNTBZwj_OLAOsZZqdrR2IDAzeZqE&amp;m=3D21UeM=
vv2ofELpScacCIlRV64tml5G3zQ3NN5NqhC90s&amp;s=3DfR1eK_EmnRha7QRf37WKaJmt1F5O=
Lq7ynG7afcmPhM0&amp;e=3D" target=3D"_blank"> https://mailarchive.ietf.org/a=
rch/msg/bess/cG3X1tTqb_vPC4rg56SEdkjqDpw</a><u></u><u></u></p>
<p class=3D"MsoNormal">=C2=A0<u></u><u></u></p>
<pre>=C2=A0<u></u><u></u></pre> <pre>______________________________________=
___________________________________________________________________________=
________<u></u><u></u></pre> <pre>=C2=A0<u></u><u></u></pre> <pre>Ce messag=
e et ses pieces jointes peuvent contenir des informations confidentielles o=
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s attachments may contain confidential or privileged information that may b=
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</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</div>
</div>
</div>
</div>

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

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From nobody Thu Apr 25 17:25:42 2019
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Subject: [bess] I-D Action: draft-ietf-bess-evpn-na-flags-03.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 BGP Enabled ServiceS WG of the IETF.

        Title           : Propagation of ARP/ND Flags in EVPN
        Authors         : Jorge Rabadan
                          Senthil Sathappan
                          Kiran Nagaraj
                          Wen Lin
	Filename        : draft-ietf-bess-evpn-na-flags-03.txt
	Pages           : 8
	Date            : 2019-04-25

Abstract:
   An EVPN MAC/IP Advertisement route can optionally carry an IPv4 or
   IPv6 addresses associated with a MAC address. Remote PEs can use this
   information to reply locally (act as proxy) to IPv4 ARP requests and
   IPv6 Neighbor Solicitation messages and reduce/suppress the flooding
   produced by the Address Resolution procedure. The information
   conveyed in the MAC/IP route may not be enough for the remote PE to
   reply to local ARP or ND requests. For example, if a PE learns an
   IPv6->MAC ND entry via EVPN, the PE would not know if that particular
   IPv6->MAC pair belongs to a host, a router or a host with an anycast
   address, as this information is not carried in the MAC/IP route
   advertisements. Similarly, other information relevant to the IP->MAC
   ARP/ND entries may be needed. This document proposes an OPTIONAL
   extended community that is advertised along with an EVPN MAC/IP
   Advertisement route and carries information relevant to the ARP/ND
   resolution, so that an EVPN PE implementing a proxy-ARP/ND function
   can reply to ARP Requests or Neighbor Solicitations with the correct
   information.




The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-bess-evpn-na-flags/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-bess-evpn-na-flags-03
https://datatracker.ietf.org/doc/html/draft-ietf-bess-evpn-na-flags-03

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-bess-evpn-na-flags-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/bess/X_H9KL9vQVDJlZa1F3Qs6VLzdkU>
Subject: Re: [bess] I-D Action: draft-ietf-bess-evpn-na-flags-03.txt
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From nobody Thu Apr 25 18:04:08 2019
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Subject: [bess] I-D Action: draft-ietf-bess-evpn-proxy-arp-nd-06.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 BGP Enabled ServiceS WG of the IETF.

        Title           : Operational Aspects of Proxy-ARP/ND in EVPN Networks
        Authors         : Jorge Rabadan
                          Senthil Sathappan
                          Kiran Nagaraj
                          Wim Henderickx
                          Greg Hankins
                          Thomas King
                          Daniel Melzer
                          Erik Nordmark
	Filename        : draft-ietf-bess-evpn-proxy-arp-nd-06.txt
	Pages           : 23
	Date            : 2019-04-25

Abstract:
   The EVPN MAC/IP Advertisement route can optionally carry IPv4 and
   IPv6 addresses associated with a MAC address. Remote PEs can use this
   information to reply locally (act as proxy) to IPv4 ARP requests and
   IPv6 Neighbor Solicitation messages (or 'unicast-forward' them to the
   owner of the MAC) and reduce/suppress the flooding produced by the
   Address Resolution procedure. This EVPN capability is extremely
   useful in Internet Exchange Points (IXPs) and Data Centers (DCs) with
   large broadcast domains, where the amount of ARP/ND flooded traffic
   causes issues on routers and CEs. This document describes how the
   EVPN Proxy-ARP/ND function may be implemented to help IXPs and other
   operators deal with the issues derived from Address Resolution in
   large broadcast domains.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-bess-evpn-proxy-arp-nd/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-bess-evpn-proxy-arp-nd-06
https://datatracker.ietf.org/doc/html/draft-ietf-bess-evpn-proxy-arp-nd-06

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-bess-evpn-proxy-arp-nd-06


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

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


From nobody Thu Apr 25 18:11:40 2019
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Subject: [bess] I-D Action: draft-ietf-bess-nsh-bgp-control-plane-10.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 BGP Enabled ServiceS WG of the IETF.

        Title           : BGP Control Plane for NSH SFC
        Authors         : Adrian Farrel
                          John Drake
                          Eric Rosen
                          Jim Uttaro
                          Luay Jalil
	Filename        : draft-ietf-bess-nsh-bgp-control-plane-10.txt
	Pages           : 58
	Date            : 2019-04-26

Abstract:
   This document describes the use of BGP as a control plane for
   networks that support Service Function Chaining (SFC).  The document
   introduces a new BGP address family called the SFC AFI/SAFI with two
   route types.  One route type is originated by a node to advertise
   that it hosts a particular instance of a specified service function.
   This route type also provides "instructions" on how to send a packet
   to the hosting node in a way that indicates that the service function
   has to be applied to the packet.  The other route type is used by a
   Controller to advertise the paths of "chains" of service functions,
   and to give a unique designator to each such path so that they can be
   used in conjunction with the Network Service Header defined in RFC
   8300.

   This document adopts the SFC architecture described in RFC 7665.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-bess-nsh-bgp-control-plane/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-bess-nsh-bgp-control-plane-10
https://datatracker.ietf.org/doc/html/draft-ietf-bess-nsh-bgp-control-plane-10

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-bess-nsh-bgp-control-plane-10


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

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


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From: "Adrian Farrel" <adrian@olddog.co.uk>
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Subject: Re: [bess] Shepherd's review of draft-ietf-bess-nsh-bgp-control-plane-06
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Well, since it's Upload Friday, I posted the new revision, but let me =
know if you think more changes are needed.

Adrian

-----Original Message-----
From: BESS <bess-bounces@ietf.org> On Behalf Of Adrian Farrel
Sent: 24 April 2019 18:38
To: stephane.litkowski@orange.com; =
draft-ietf-bess-nsh-bgp-control-plane@ietf.org
Cc: bess@ietf.org
Subject: Re: [bess] Shepherd's review of =
draft-ietf-bess-nsh-bgp-control-plane-06

Hi Stephane,

I finally carved some time...

* NEXTHOP encoding:
>>> How is the nexthop encoded in the NLRI ?
>>
>> A bit confused about this question.
>
> [SLI] I'm talking about the nexthop field of the MP_REACH_NLRI =
attribute,=20
> you must set a nexthop field even if it is not used for forwarding and =
you
> need to set how it is encoded.
>
> Ah, that!
> Yes, it's just a loopback address of the advertising SFF.
> Added a paragraph for that.
>[SLI2] Thanks for the new text, I'm just wondering if it is enough =
detailed or not,
> especially as IPv4 or IPv6 NH could be involved.
> Looking at mvpn RFCs, they are using similar wording, so I suppose we =
could=20
> let it this way.

OK, I'm leaving this without further changes.

* BGP ERROR HANDLING:
>>> I don=E2=80=99t see the =E2=80=9Cerror handling=E2=80=9D behavior =
associated with this attribute
>>> (discard, treat-as-withdraw=E2=80=A6)
>>
>> I think the errors are covered by section 6 of RFC 4271, but we need =
to
>> point to it.
>
> [SLI] You have added " Malformed SFP attributes, or those that in =
error in
> some way, MUST be handled as described in Section 6 of [RFC4271]"
> This is not enough ad RFC7606 allows for a more "graceful" process of=20
> errors and it's up to each new attribute to have its own behavior in =
term
> of error processing. RFC7606 has some guidelines.
>
> This one will take a little more time to work up some text.
> We'll get back to you.
>
> [SLI2] This is an important thing to address, and the IESG or Routing =
Directorate
> may catch that as well.

OK, a chunk more text. Does this work for you?

   Section 6 of [RFC4271] describes the handling of malformed BGP
   attributes, or those that are in error in some way.  [RFC7606]
   revises BGP error handling specifically for the for UPDATE message,
   provides guidelines for the authors of documents defining new
   attributes, and revises the error handling procedures for a number of
   existing attributes.  This document introduces the SFP attribute and
   so defines error handling as follows:

   o  When parsing a message, an unknown Attribute Type code or a length
      that suggests that the attribute is longer than the remaining
      message is treated as a malformed message and the "treat-as-
      withdraw" approach used as per [RFC7606].

   o  When parsing a message that contains an SFP attribute, the
      following cases constitute errors:

      1.  Optional bit is set to 0 in SFP attribute.

      2.  Transitive bit is set to 0 in SFP attribute.

      3.  Unknown TLV type field found in SFP attribute.

      4.  TLV length that suggests the TLV extends beyond the end of the
          SFP attribute.

      5.  Association TLV contains an unknown SFPR-RD.

      6.  No Hop TLV found in the SFP attribute.

      7.  No SFT TLV found in a Hop TLV.

      8.  Unknown SFIR-RD found in a Hop TLV.

   o  The errors listed above are treated as follows:

      1., 2., 6., 7.:  The attribute MUST be treated as malformed and
         the "treat-as-withdraw" approach used as per [RFC7606].

      3.:  Unknown TLVs SHOULD be ignored, and message processing SHOULD
         continue.

      4.:  Treated as a malformed message and the "treat-as-withdraw"
         approach used as per [RFC7606]

      5., 8.:  The absence of an RD with which to corollate is nothing
         more than a soft error.  The receiver SHOULD store the
         information from the SFP attribute until a corresponding
         advertisement is received.  An implementation MAY time-out such
         stored SFP attributes to avoid becoming over-loaded.


* FLOWSPEC traffic steering:
>>> NEW COMMENT:
>>> Section 5:
>>> "Note that each FlowSpec update MUST be tagged with the route target
>>>  of the overlay or VPN network for which it is intended."
>> [SLI] You should be more clear that VPN-IPv4 and VPN-IPv6 Flowspec
>> families must be used, it's not just a matter of RTs.
>
> A couple of the authors have discussed this a bit and we are puzzled.
>
> RFC 5575 section 8 discusses the applicability of Flowspecs to VPNs.
> https://www.iana.org/assignments/flow-spec/flow-spec.xhtml#flow-spec-2 =

> does not list any VPN Flowspecs.
> draft-ietf-pce-pcep-flowspec makes observations about VPN =
identification
> and applicability to Flowspecs.
> draft-ietf-idr-flowspec-l2vpn has a redefinition of SAFI 134 to apply =
to=20
> Flowspecs to an L2VPN environment.
>
> [SLI2] I see various cases:
> - traffic is coming from an IPVPNv4 and should be steered on an SFC, =
in such
>   a case RFC5575 Section 8 (AFI/SAFI 1/134) must be used, an RT is =
attached.
> - traffic is coming from the global routing table and should be =
steered on an
>   SFC, in such a case  the base RFC5575 using AFI/SAFI 1/133 must be =
used
>   and there is no RT attached. The trick here is that you need to set =
in the
>   action: - the SFC you want the traffic to be steered on as well as =
the VPN
>   to look the SFC for (Like a redirect RT + SFC steering). If there is =
no VPN
>   redirection, the SFC is considered to be available in the global =
routing table.
> - traffic is coming from an L2VPN, this is similar to the L3VPN case.
> - same considerations applies to IPv6 and VPNv6.

OK, I think we need to separate two things.
Section 5 is concerned with how to select among possible next hops on an =
SFP. That is, the packet is already classified and assigned to an SFP, =
but some load-balancing choices have to be made. So I don't think =
Section 5 is the place for this discussion.
However, Section 7.4 is about classifying traffic onto SFPs. =
Specifically, it is about how to indicate, using BGP, which traffic =
flows should be assigned to which SPF at the Classifier component of the =
SFC system. This section seems to be relevant to the question you are =
asking.

But this second section seems to have it all covered by modelling =
exactly the flowspec function used in BGP flow specification and adding =
an extended community for SFC.

So, I think nothing else is needed for this issue.

Thanks,
Adrian


-----Original Message-----
From: Adrian Farrel [mailto:adrian@olddog.co.uk]=20
Sent: Wednesday, March 06, 2019 16:06
To: LITKOWSKI Stephane OBS/OINIS; =
draft-ietf-bess-nsh-bgp-control-plane@ietf.org
Cc: bess@ietf.org
Subject: RE: Shepherd's review of =
draft-ietf-bess-nsh-bgp-control-plane-06

Thanks again Stephane,

I think we have closure on most (but not all) of your points. I'll post =
another revision now because it makes the incremental changes easier to =
process. But we can have another go round if any of the unresolved =
issues merit it.

One thing to push back on from before was the use of "portal" or =
"gateway". We were using "portal" and you asked us to change to =
"gateway". I initially thought that would be OK, but on reflection we =
think that "gateway" has specific connotations in networking where it =
means an interworking function between two different protocols and this =
is most definitely not what is intended. So, because "portal" is a =
synonym, we prefer to go back to using that.

   Thus the SFF can be seen as a portal in the underlay network through
   which a particular SFI is reached.

Cheers,
Adrian

> New comment:
>
> " When the SFF receives the packet and the NSH back from the SFI it
>   MUST select the next SFI"
>
> [SLI] Even if I agree that this is the intended behavior, it is not =
the
> purpose of this document to set the dataplane behavior of NSH. I
> think keeping the "MUST" as lower case is fine.

Ah yes.
I got carried away.

>>> The Figure 1 is not really used in this section as part of the =
existing
>>> text. I would be better to have a companion text that explains the
>>> figure.
>>
>> Wow! Yes. That's embarrassing.
>
> [SLI] The provided text is good. Just few comments:
>
> - the figure wraps on two pages, I missed the SFa in the figure as it =
is
>   located on the other page. It would be great if you could make it =
fit
>   on one page.

Hmmm, yes.
I will make the figure small enough to fit on one page, but I won't =
handle pagination at this stage: the RFC Editor will resolve that in the =
final formatting.

> - don't you need tunnels between SFF2 and SFF3 and between SFF1=20
>   and SFF4 (full mesh). I agree that tunnel may be established on =
demand
>   if an SFC is using two SFFs, but here we don't have this =
information.

You *could* certainly have a those tunnels. But in practice there is =
unlikely to be a full mesh. This is a bit like a content distribution =
problem: a multi-layer network engineering solution is needed to place =
the SFs and decide which SFFs need to be connected with tunnels. =
Furthermore, if an SFC will never need to take SFs in a particular =
order, then tunnels wouldn't be needed.

> As the figure is already complex, adding tunnels may overload it. =
Maybe
> we could add a text telling that to simplify the figure only some =
tunnels
> between SFFs are represented.

Right, no need to complicate the figure.
I'll add...
      <t>Note that, for convenience and clarity, <xref =
target=3D"SFCarch" /> shows only a few tunnels between
         SFFs.  There could be a full mesh of such tunnels, or more =
likely, a selection of tunnels connecting
         key SFFs to enable the construction of SFPs and to balance load =
and traffic in the network.</t>

> - the example of SFC looks strange to me as SFd may be used twice
>   in the chain why not using " SFa, an SF of type SFTx, and SFe" ?

Bad text, well caught.
Text should read...

      Suppose an SFC needs to include SFa,
      an SF of type SFTx, and SFc.

> - There is a sentence telling that the figure illustrates =
loadbalancing,
>   however I think that the sentence " A number of SFPs can be
>   constructed using any instance of SFb or using SFd." is not enough
>   to describe the loadbalancing. Who is doing the loadbalancing ?

OK. Now reads...

      <t>This figure demonstrates how load balancing can be achieved by =
creating several SFPs that satisfy
         the same SFC.  Suppose an SFC needs to include SFa, an SF of =
type SFTx, and SFc.  A number of SFPs
         can be constructed using any instance of SFb or using SFd.  =
Load balancing may be applied at two
         places:
         <list style=3D"symbols">
           <t>The Classifier may distribute different flows onto =
different SFPs to share the load in the
              network and across SFIs.</t>
           <t>SFF-2 may distribute different flows (on the same SFP) to =
different instances of SFb to share
              the processing load.</t>
         </list></t>

>>> =E2=80=9CThe Service Function Type identifies a service =
function=E2=80=9D. I don=E2=80=99t
>>> think we can really say that, it identifies the type of service the =
SF
>>> is providing but not the SF itself.
>>
>> Yes
>
> [SLI] The new text sounds strange.  Even if it is correct, it sounds =
as a repetition:
> " The Service Function Type identifies a service function type".
> Could we use something like : "The Service Function Type identifies =
the
> functions/features of service function can offer".

OK

>>> How is the nexthop encoded in the NLRI ?
>>
>> A bit confused about this question.
>
> [SLI] I'm talking about the nexthop field of the MP_REACH_NLRI =
attribute,=20
> you must set a nexthop field even if it is not used for forwarding and =
you
> need to set how it is encoded.

Ah, that!
Yes, it's just a loopback address of the advertising SFF.
Added a paragraph for that.

>>> I don=E2=80=99t see the =E2=80=9Cerror handling=E2=80=9D behavior =
associated with this attribute
>>> (discard, treat-as-withdraw=E2=80=A6)
>>
>> I think the errors are covered by section 6 of RFC 4271, but we need =
to
>> point to it.
>
> [SLI] You have added " Malformed SFP attributes, or those that in =
error in
> some way, MUST be handled as described in Section 6 of [RFC4271]"
> This is not enough ad RFC7606 allows for a more "graceful" process of=20
> errors and it's up to each new attribute to have its own behavior in =
term
> of error processing. RFC7606 has some guidelines.

This one will take a little more time to work up some text.
We'll get back to you.

>>> Section 4.1
>
> [SLI] I have read it again, I think the last sentence was causing me
> some trouble:
> "An SFF
>   that has a presence in multiple service function overlay networks
>   (i.e., imports more than one RT) may find it helpful to maintain
>   separate forwarding state for each overlay network.".
>
> The isolation of the controlplane and forwarding information between
> tenants is a mandatory thing for security reason. The "may find it
> helpful" makes this something nice to have making the multitenancy
> case not widely deployed.

OK, I see the problem.
Of course, each SFP is separate routing state (like a signalled TE-LSP), =
so it is not technically necessary to keep separate routing state for =
each overlay network. The tenants would have no visibility into the =
state at SFFs.
And from a black box point of view, no one can tell the difference, so =
we don't need to instruct implementations.
But we can agree that it would be highly likely to maintain separate =
forwarding state for each overlay network.
So I will strengthen this to s/may find it helpful/will usually/

> NEW COMMENT:
> Section 5:
> "Note that each FlowSpec update MUST be tagged with the route target
>  of the overlay or VPN network for which it is intended."
> [SLI] You should be more clear that VPN-IPv4 and VPN-IPv6 Flowspec
> families must be used, it's not just a matter of RTs.

A couple of the authors have discussed this a bit and we are puzzled.

RFC 5575 section 8 discusses the applicability of Flowspecs to VPNs.
https://www.iana.org/assignments/flow-spec/flow-spec.xhtml#flow-spec-2 =
does not list any VPN Flowspecs.
draft-ietf-pce-pcep-flowspec makes observations about VPN identification =
and applicability to Flowspecs.
draft-ietf-idr-flowspec-l2vpn has a redefinition of SAFI 134 to apply to =
Flowspecs to an L2VPN environment.

I suspect that you are referring to the last of these four references.

Maybe you could suggest some text that would cover your concern.

>>> Section 7.1
>>>
>>> While I understand that the node doing the classification can =
perform a deep
>>> packet inspection to get an entropy indicator, any intermediate node =
cannot
>>> set it again as the NSH header will be there.
>>=20
>> *If* you want entropy for the underlay network, you have to get
>> it from somewhere. And an entropy label is going to be a lot more
>> practical that hoping that each hope in the underlay can do some
>> form of hash.
>>
>> I don't propose any changes to the document for this point, but=20
>> do feel free to negotiate.
>
> [SLI] I don't think that the current text actually solves the =
loadbalancing
> issue in the underlay. However I'm also wondering if it's the job of =
this
> draft (which defines a controlplane) to define where to set the =
entropy
> indicator and what are the requirements in term of hashing. It's more =
a
> dataplane issue, out of scope of this draft. I don't know if there is =
already
> other document in SFC or other WGs dealing with entropy issues when
> NSH is there.
> So I see two options:
> - you address fully the problem in your draft
> - or you make it out of scope, so some text should be=20
>   removed. You can still say that there is a problem to solve.

I like your second option =F0=9F=98=8A

And the problem is made more complex when you consider that there may be =
different underlays between successive SFFs meaning that entropy has to =
be mapped between tunnel types.

Actually, this is a good change. This is a control plane document, not a =
full system specification. We have deleted the whole entropy section, =
and strengthened the text in 2.2 to note that "something must be done".

> I don=E2=80=99t like the representation of RD using =
=E2=80=9C192.0.2.1,1=E2=80=9D as the =E2=80=9C,=E2=80=9D can
> be confusing with a regular separator. Why not using =
:=E2=80=9D192.0.2.1:1=E2=80=9D
> notation which is well known ?
>
> [SLI] I don't see the change in v08

Snafu
Made the change in the XML and didn't regenerate the TXT.
Yes, "idiot" is an appropriate word.

>>> Section 8.9.1:
>>>
>>> How does an SFF know that an attached SFI is stateful ? I =
don=E2=80=99t
>>> think it can know that.
>>
>> Well, how does the SFF know which SFIs are attached and what
>> their types are?
>> The registration of SFIs to their SFFs is out of scope of this =
document=20
>> (I think it was raised as a separate function in =
draft-ietf-sfc-control-plane).
>
> [SLI] Fine, could you tell that it is out of scope ?

Certainly.

>>> I don=E2=80=99t think that the fact that SFF2 is used in both =
direction is safe
>>> from a load balancing perspective.
>>> If the hashing algorithm used by SFF2 is sensible to the order of =
the
>>> keys (like source vs dest address, or source vs dest port), it may=20
>>> provide a different SFI as a result of the hashing between the
>>> forward and the reverse flow.
>>
>> It's unclear what hashing might be used, but it seems to me that the
>> primary choice will be based on the SPI.
>> Of course, if the hash goes further (i.e.., payload) and the SFF is =
aware=20
>> of forward/reverse traffic it is capable of hashing the right fields.
>>
>> But does this smells of an implementation detail?
>
> [SLI] Of course that will be implementation dependent, but the fact =
that
>  it is implementation dependent makes the behavior unpredictable and
> does not ensure that you will get symmetry.

OK. I went to add some text, looked for the right place and found =
section 7.3 where we have...

   For bidirectional SFPs where the same instance of a stateful SF must
   be traversed in both directions, it is not enough to leave the choice
   of service function instance as a local choice even if the load
   balancing is stable because coordination would be required between
   the decision points in the forward and reverse directions and this
   may be hard to achieve in all cases except where it is the same SFF
   that makes the choice in both directions.

   Note that this approach necessarily increases the amount of SFP state
   in the network (i.e., there are more SFPs).  It is possible to
   mitigate this effect by careful construction of SFPs built from a
   concatenation of other SFPs.

I think that covers it.
I'll put in a back pointer from 8.9.1 to 7.3.
Will also add a note to 8.9.1 to the effect that the problem can be =
resolved by a combination of detailed (choice-free) SFPs, and suitable =
programming of Classifiers.

>>> Section 9:
>>>
>>> Do we have to set limits on receiving nodes in term of number of
>>> states received from the controller to mitigate some attack ?
>>
>> I'm not sure, but probably not. But anyway, that would be out of =
scope.
>
> [SLI] I'm challenging, as the SecDir may challenge you on that point=20
> or a similar one.

So the attack would rely on the controller being subverted, or the =
communications between controller and SFF being spoofed.

In the former case we have a complete disaster (similar to a route =
reflector being subverted), and the things that go wrong will be far =
worse than an overload attack on an SFF. And, not only is this problem =
out of scope, but it is not defendable in open systems. I think we rely =
on regulated software upgrades.

The communications between controller and SFF do not form part of this =
specification. So, I will add a paragraph to highlight the risk.

>>> The text talks about security of BGP, what kind of mechanism
>>> should be put in place ?
>>
>> This has similar security behaviour to a L3VPN, so I guess the same =
rules apply.
>
> [SLI] That would be good to tell this in the sec considerations. As =
you use
> similar distribution mechanism as RFC4364, the same sec considerations =
applies.

OK

>>> Do we have any interdomain considerations ?
>>
>> 8300 says that the intended scope is for use within a single =
provider's operational
>> domain.
>
> [SLI] That would be good to remind it as well.

OK. Added.

>>> References:
>>>
>>> I think that the mpls-sfc and mpls-sfc-encaps should also be
>>> normative as you are defining a controlplane to use them.
>>
>>I don't mind doing that.
>
> [SLI] These two are more debatable. Let's keep them as info, and=20
> we will see if IESG raises any concern.

Well, actually, since those two docs are on the Standards Track and are =
well ahead in the pipe, let's make them Normative.


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From nobody Mon Apr 29 01:17:42 2019
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From: <stephane.litkowski@orange.com>
To: "adrian@olddog.co.uk" <adrian@olddog.co.uk>, "draft-ietf-bess-nsh-bgp-control-plane@ietf.org" <draft-ietf-bess-nsh-bgp-control-plane@ietf.org>
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Thread-Topic: Shepherd's review of draft-ietf-bess-nsh-bgp-control-plane-06
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Date: Mon, 29 Apr 2019 08:17:34 +0000
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From nobody Mon Apr 29 08:51:34 2019
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From: IETF Meeting Session Request Tool <session-request@ietf.org>
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Subject: [bess] bess - New Meeting Session Request for IETF 105
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A new meeting session request has just been submitted by mankamana prasad mishra, a Secretary of the bess working group.


---------------------------------------------------------
Working Group Name: BGP Enabled ServiceS
Area Name: Routing Area
Session Requester: mankamana mishra

Number of Sessions: 2
Length of Session(s):  1.5 Hours, 1.5 Hours
Number of Attendees: 90
Conflicts to Avoid: 
 First Priority:  idr nvo3
 Second Priority:  spring sfc mpls pim bier pals
 Third Priority:  i2rs


People who must be present:
  Matthew Bocci
  Martin Vigoureux
  Stephane Litkowski
  mankamana prasad mishra

Resources Requested:

Special Requests:
  
---------------------------------------------------------


From nobody Mon Apr 29 19:39:30 2019
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--0000000000001ab5a10587b64f1f
Content-Type: text/plain; charset="UTF-8"

Hi Everyone,

draft-ietf-bess-evpn-inter-subnet-forwarding describes the mobility
procedure to be followed when a TS moves from a source NVE to a target NVE
and starts sending data traffic without first initiating an ARP request. It
says the following in section 4.2:

<snip>
   - The source NVE upon receiving this MAC/IP advertisement, realizes
   that the MAC has moved to the new NVE. It updates its MAC-VRF table
   accordingly by updating the adjacency information for that MAC
   address to point to the target NVE and withdraws its EVPN MAC/IP
   route that has only the MAC address (if it has advertised such route
   previously). Furthermore, *it searches its ARP table for this MAC and*
   *sends an ARP probe for this <MAC,IP> pair*. The ARP request message is
   sent both locally to all attached TSes in that subnet as well as it
   is sent to other NVEs participating in that subnet including the
   target NVE.
</snip>

The question I have is, the MAC/IP Advertisement route the source NVE
receives from the target NVE in the above case has only the MAC address of
the TS and the RT corresponding to the MAC-VRF. How can the source NVE
deduce the IP-VRF to search the corresponding ARP table and send an ARP
probe?

Regards,
Muthu

--0000000000001ab5a10587b64f1f
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<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div cl=
ass=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;font-=
size:small">Hi Everyone,</div><div class=3D"gmail_default" style=3D"font-fa=
mily:arial,helvetica,sans-serif;font-size:small"><br></div><div class=3D"gm=
ail_default"><font face=3D"arial, helvetica, sans-serif">draft-ietf-bess-ev=
pn-inter-subnet-forwarding describes the mobility procedure to be followed =
when a TS moves from a source NVE to a target NVE and starts sending data t=
raffic without first initiating an ARP request. It says the following in se=
ction 4.2:</font><br></div><div class=3D"gmail_default"><font face=3D"arial=
, helvetica, sans-serif"><br></font></div><div class=3D"gmail_default"><fon=
t face=3D"arial, helvetica, sans-serif">&lt;snip&gt;</font></div><div class=
=3D"gmail_default"><font face=3D"arial, helvetica, sans-serif"><div class=
=3D"gmail_default">=C2=A0 =C2=A0- The source NVE upon receiving this MAC/IP=
 advertisement, realizes</div><div class=3D"gmail_default">=C2=A0 =C2=A0tha=
t the MAC has moved to the new NVE. It updates its MAC-VRF table</div><div =
class=3D"gmail_default">=C2=A0 =C2=A0accordingly by updating the adjacency =
information for that MAC</div><div class=3D"gmail_default">=C2=A0 =C2=A0add=
ress to point to the target NVE and withdraws its EVPN MAC/IP</div><div cla=
ss=3D"gmail_default">=C2=A0 =C2=A0route that has only the MAC address (if i=
t has advertised such route</div><div class=3D"gmail_default">=C2=A0 =C2=A0=
previously). Furthermore, <b>it searches its ARP table for this MAC and</b>=
</div><div class=3D"gmail_default">=C2=A0 =C2=A0<b>sends an ARP probe for t=
his &lt;MAC,IP&gt; pair</b>. The ARP request message is</div><div class=3D"=
gmail_default">=C2=A0 =C2=A0sent both locally to all attached TSes in that =
subnet as well as it</div><div class=3D"gmail_default">=C2=A0 =C2=A0is sent=
 to other NVEs participating in that subnet including the</div><div class=
=3D"gmail_default">=C2=A0 =C2=A0target NVE.</div></font></div><div class=3D=
"gmail_default"><font face=3D"arial, helvetica, sans-serif">&lt;/snip&gt;</=
font></div><div class=3D"gmail_default"><font face=3D"arial, helvetica, san=
s-serif"><br></font></div><div class=3D"gmail_default"><font face=3D"arial,=
 helvetica, sans-serif">The question I have is, the MAC/IP Advertisement ro=
ute the source NVE receives from the target NVE in the above case has only =
the MAC address of the TS and the RT corresponding to the MAC-VRF. How can =
the source NVE deduce the IP-VRF to search the corresponding ARP table and =
send an ARP probe?</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">Regards,</font></div><div class=
=3D"gmail_default"><font face=3D"arial, helvetica, sans-serif">Muthu</font>=
</div></div></div></div></div>

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From: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>
To: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>, "bess@ietf.org" <bess@ietf.org>
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From: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>
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From: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>
To: "Ali Sajassi (sajassi)" <sajassi@cisco.com>, "bess@ietf.org" <bess@ietf.org>
Thread-Topic: [bess] I-D Action: draft-ietf-bess-evpn-na-flags-03.txt
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Subject: Re: [bess] I-D Action: draft-ietf-bess-evpn-na-flags-03.txt
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