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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>
CC: Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>, Alexander Ferdman <Alexander.Ferdman@ecitele.com>, Shell Nakash <Shell.Nakash@ecitele.com>, "bess@ietf.org" <bess@ietf.org>, "draft-sajassi-bess-evpn-virtual-eth-segment.authors@ietf.org" <draft-sajassi-bess-evpn-virtual-eth-segment.authors@ietf.org>, "pals@ietf.org" <pals@ietf.org>, "Luc Andre Burdet (lburdet)" <lburdet@cisco.com>, "Ali Sajassi (sajassi)" <sajassi@cisco.com>
Thread-Topic: [bess] All-Active Multi-homing and Virtual Ethernet Segments: A Question
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Date: Tue, 2 Oct 2018 08:24:18 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/GrCDWT2CVjwnF7EYqTyz-c7fK-8>
Subject: Re: [bess] All-Active Multi-homing and Virtual Ethernet Segments: A Question
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "Parag Jain (paragj)" <paragj@cisco.com>
CC: "draft-salam-bess-evpn-oam-req-frmwk@ietf.org" <draft-salam-bess-evpn-oam-req-frmwk@ietf.org>, Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>, Ron Sdayoor <Ron.Sdayoor@ecitele.com>, "bess@ietf.org" <bess@ietf.org>, Rotem Cohen <Rotem.Cohen@ecitele.com>, Donald Eastlake <d3e3e3@gmail.com>
Thread-Topic: [bess] EVPN FECs in LSP Ping
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Subject: Re: [bess] EVPN FECs in LSP Ping
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From: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
CC: Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>, Alexander Ferdman <Alexander.Ferdman@ecitele.com>, Shell Nakash <Shell.Nakash@ecitele.com>, "bess@ietf.org" <bess@ietf.org>, "draft-sajassi-bess-evpn-virtual-eth-segment.authors@ietf.org" <draft-sajassi-bess-evpn-virtual-eth-segment.authors@ietf.org>, "pals@ietf.org" <pals@ietf.org>, "Luc Andre Burdet (lburdet)" <lburdet@cisco.com>, "Ali Sajassi (sajassi)" <sajassi@cisco.com>
Thread-Topic: [bess] All-Active Multi-homing and Virtual Ethernet Segments: A Question
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Subject: Re: [bess] All-Active Multi-homing and Virtual Ethernet Segments: A Question
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From nobody Tue Oct  2 21:11:41 2018
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From: Brian Carpenter <brian.e.carpenter@gmail.com>
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Subject: [bess] Genart last call review of draft-ietf-bess-mvpn-expl-track-10
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Reviewer: Brian Carpenter
Review result: Ready with Issues

Gen-ART Last Call review of draft-ietf-bess-mvpn-expl-track-10

I am the assigned Gen-ART reviewer for this draft. The General Area
Review Team (Gen-ART) reviews all IETF documents being processed
by the IESG for the IETF Chair.  Please treat these comments just
like any other last call comments.

For more information, please see the FAQ at
<http://wiki.tools.ietf.org/area/gen/trac/wiki/GenArtfaq>.

Document: draft-ietf-bess-mvpn-expl-track-10.txt
Reviewer: Brian Carpenter
Review Date: 2018-10-02
IETF LC End Date: 2018-10-09
IESG Telechat date: 

Summary: Ready with issues
--------

Comments: 
---------

I agree with the point raised in the Routing Area review
(be explicit about the updated sections of RFC 6514, 6625,
and 7524).

Minor issues:
-------------

As I understand it, if a network only partially supports the new
(LIR-pF) flag, it doesn't work properly. So we find at the end of
section 2:

...the ingress node can conclude
   that the egress node originating that Leaf A-D route does not support
   the LIR-pF flag.

   The software at the ingress node SHOULD detect this, and should have
   a way of alerting the operator that the deployment is not properly
   configured.

I don't see why this is only a SHOULD, and I don't see why the operator
alert is not a MUST too. Surely the operator always needs to be alerted?



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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>
CC: Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>, Alexander Ferdman <Alexander.Ferdman@ecitele.com>, Shell Nakash <Shell.Nakash@ecitele.com>, "bess@ietf.org" <bess@ietf.org>, "draft-sajassi-bess-evpn-virtual-eth-segment.authors@ietf.org" <draft-sajassi-bess-evpn-virtual-eth-segment.authors@ietf.org>, "pals@ietf.org" <pals@ietf.org>, "Luc Andre Burdet (lburdet)" <lburdet@cisco.com>, "Ali Sajassi (sajassi)" <sajassi@cisco.com>
Thread-Topic: [bess] All-Active Multi-homing and Virtual Ethernet Segments: A Question
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Subject: Re: [bess] All-Active Multi-homing and Virtual Ethernet Segments: A Question
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CC: P Muthu Arul Mozhi <p.muthu.arul.mozhi@ericsson.com>, Jiang He <jiang.he@ericsson.com>
Thread-Topic: EVPN MH: Backup node behavior in Primary Path Failure
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Subject: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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Hello Everyone,



I have a question on Primary PE encountering a failure in EVPN multihoming

in single active mode.



RFC7432, section 14.1.1:

<snip>

   If there is more than one backup PE for a given ES, the remote PE

   MUST use the primary PE's withdrawal of its set of Ethernet A-D per

   ES routes as a trigger to start flooding traffic for the associated

   MAC addresses (as long as flooding of unknown unicast packets is

   administratively allowed), as it is not possible to select a single

   backup PE.

</snip>



Questions:

1. Will the node in backup mode forward the packet to CE?

2. Will all the nodes in backup mode forward the packet before DF election?

3. If they forward, how is duplicate packets handled, in this case?



Please help me anwere these questions.



Thanks & Regards

Jaikumar S



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<p class=3D"MsoPlainText">Hello Everyone,<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">I have a question on Primary PE encountering a fa=
ilure in EVPN multihoming<o:p></o:p></p>
<p class=3D"MsoPlainText">in single active mode.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">RFC7432, section 14.1.1:<o:p></o:p></p>
<p class=3D"MsoPlainText"><span style=3D"font-family:&quot;Courier New&quot=
;">&lt;snip&gt;<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-family:&quot;Courier New&quot=
;">&nbsp;&nbsp; If there is more than one backup PE for a given ES, the rem=
ote PE<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-family:&quot;Courier New&quot=
;">&nbsp;&nbsp; MUST use the primary PE's withdrawal of its set of Ethernet=
 A-D per<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-family:&quot;Courier New&quot=
;">&nbsp;&nbsp; ES routes as a trigger to start flooding traffic for the as=
sociated<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-family:&quot;Courier New&quot=
;">&nbsp;&nbsp; MAC addresses (as long as flooding of unknown unicast packe=
ts is<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-family:&quot;Courier New&quot=
;">&nbsp;&nbsp; administratively allowed), as it is not possible to select =
a single<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-family:&quot;Courier New&quot=
;">&nbsp;&nbsp; backup PE.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-family:&quot;Courier New&quot=
;">&lt;/snip&gt;<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Questions:<o:p></o:p></p>
<p class=3D"MsoPlainText">1. Will the node in backup mode forward the packe=
t to CE?<o:p></o:p></p>
<p class=3D"MsoPlainText">2. Will all the nodes in backup mode forward the =
packet before DF election?<o:p></o:p></p>
<p class=3D"MsoPlainText">3. If they forward, how is duplicate packets hand=
led, in this case?<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Please help me anwere these questions.<o:p></o:p>=
</p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Thanks &amp; Regards<o:p></o:p></p>
<p class=3D"MsoPlainText">Jaikumar S<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
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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>, Jiang He <jiang.he@ericsson.com>
Thread-Topic: EVPN MH: Backup node behavior in Primary Path Failure
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Date: Wed, 3 Oct 2018 10:15:27 +0000
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Subject: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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Hello Everyone,

Sorry if it is a duplicate. I repost this query as I did not receive any re=
sponse yet.
(I was wondering if this mail already reached the group or not)


I have a question on Primary PE encountering a failure in EVPN multihoming

in single active mode.



RFC7432, section 14.1.1:

<snip>

   If there is more than one backup PE for a given ES, the remote PE

   MUST use the primary PE's withdrawal of its set of Ethernet A-D per

   ES routes as a trigger to start flooding traffic for the associated

   MAC addresses (as long as flooding of unknown unicast packets is

   administratively allowed), as it is not possible to select a single

   backup PE.

</snip>



Questions:

1. Will the node in backup mode forward the packet to CE?

2. Will all the nodes in backup mode forward the packet before DF election?

3. If they forward, how is duplicate packets handled, in this case?



Please help me anwere these questions.



Thanks & Regards

Jaikumar S



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<p class=3D"MsoPlainText">Hello Everyone,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Sorry if it is a duplicate. I repost this query as I=
 did not receive any response yet.<o:p></o:p></p>
<p class=3D"MsoNormal">(I was wondering if this mail already reached the gr=
oup or not)<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">I have a question on Primary PE encountering a fa=
ilure in EVPN multihoming<o:p></o:p></p>
<p class=3D"MsoPlainText">in single active mode.<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">RFC7432, section 14.1.1:<o:p></o:p></p>
<p class=3D"MsoPlainText"><span style=3D"font-family:&quot;Courier New&quot=
;">&lt;snip&gt;<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-family:&quot;Courier New&quot=
;">&nbsp;&nbsp; If there is more than one backup PE for a given ES, the rem=
ote PE<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-family:&quot;Courier New&quot=
;">&nbsp;&nbsp; MUST use the primary PE's withdrawal of its set of Ethernet=
 A-D per<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-family:&quot;Courier New&quot=
;">&nbsp;&nbsp; ES routes as a trigger to start flooding traffic for the as=
sociated<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-family:&quot;Courier New&quot=
;">&nbsp;&nbsp; MAC addresses (as long as flooding of unknown unicast packe=
ts is<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-family:&quot;Courier New&quot=
;">&nbsp;&nbsp; administratively allowed), as it is not possible to select =
a single<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-family:&quot;Courier New&quot=
;">&nbsp;&nbsp; backup PE.<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><span style=3D"font-family:&quot;Courier New&quot=
;">&lt;/snip&gt;<o:p></o:p></span></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Questions:<o:p></o:p></p>
<p class=3D"MsoPlainText">1. Will the node in backup mode forward the packe=
t to CE?<o:p></o:p></p>
<p class=3D"MsoPlainText">2. Will all the nodes in backup mode forward the =
packet before DF election?<o:p></o:p></p>
<p class=3D"MsoPlainText">3. If they forward, how is duplicate packets hand=
led, in this case?<o:p></o:p></p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Please help me anwere these questions.<o:p></o:p>=
</p>
<p class=3D"MsoPlainText"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoPlainText">Thanks &amp; Regards<o:p></o:p></p>
<p class=3D"MsoPlainText">Jaikumar S<o:p></o:p></p>
<p class=3D"MsoPlainText"><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: Jiang He <jiang.he@ericsson.com>, P Muthu Arul Mozhi <p.muthu.arul.mozhi@ericsson.com>
Thread-Topic: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/Hys860GYbwueSOlj6RbNqbMbLg4>
Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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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: Jiang He <jiang.he@ericsson.com>, P Muthu Arul Mozhi <p.muthu.arul.mozhi@ericsson.com>
Thread-Topic: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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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: Jiang He <jiang.he@ericsson.com>, P Muthu Arul Mozhi <p.muthu.arul.mozhi@ericsson.com>
Thread-Topic: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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Date: Thu, 4 Oct 2018 09:28:13 +0000
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Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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From: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
Date: Thu, 4 Oct 2018 16:44:11 +0530
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Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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Content-Type: text/plain; charset="UTF-8"

Please see inline..

On Thu, Oct 4, 2018 at 3:33 PM Rabadan, Jorge (Nokia - US/Mountain View) <
jorge.rabadan@nokia.com> wrote:

> In-line.
>
>
>
> Thx
>
> Jorge
>
>
>
> *From: *Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com>
> *Date: *Thursday, October 4, 2018 at 11:28 AM
> *To: *"Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>,
> "bess@ietf.org" <bess@ietf.org>
> *Cc: *Jiang He <jiang.he@ericsson.com>, P Muthu Arul Mozhi <
> p.muthu.arul.mozhi@ericsson.com>
> *Subject: *RE: [bess] EVPN MH: Backup node behavior in Primary Path
> Failure
>
>
>
> Thanks Jorge for the quick reply.
>
> Please find further question below.
>
>
>
> *From:* Rabadan, Jorge (Nokia - US/Mountain View) <jorge.rabadan@nokia.com>
>
> *Sent:* Thursday, October 4, 2018 1:52 PM
> *To:* Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com>;
> bess@ietf.org
> *Cc:* Jiang He <jiang.he@ericsson.com>; P Muthu Arul Mozhi <
> p.muthu.arul.mozhi@ericsson.com>
> *Subject:* Re: [bess] EVPN MH: Backup node behavior in Primary Path
> Failure
>
>
>
> Hi,
>
>
>
> Questions:
>
> 1.       Will the node in backup mode forward the packet to CE?
>
> [JORGE] as soon as it becomes DF it can forward packets to the CE. The
> backup node will have to run DF election upon the ES route withdrawal from
> the primary. If AC-DF is enabled, it can also react to the withdrawal of AD
> routes from the primary PE.
>
> *[Jai] Does that mean if any packet comes to a node that is still in the
> backup mode will get dropped, before the new DF election is complete? Why
> cant this be used as FRR? Or what is the use case of having backup node(s)?*
>
> *[JORGE2] when the primary node fails, ES and AD routes are withdrawn. *
>
Suppose we have a full mesh of iBGP sessions b/w the PEs, then who would
withdraw the routes if the primary PE / DF itself fails? Instead, the BGP
session would timeout causing the primary PE's neighbors to flush out the
A-D routes received from the primary PE, right? This can take several
seconds, isn't it?

Regards,
Muthu

> *The AD route withdrawal is an indication for remote nodes that they have
> to send traffic to the backup (for a given MAC) or to flush the MACs if
> there are more than 2 PEs in the ES. Around the same time or maybe earlier,
> the ES route withdrawal will make the backup PE take over as DF. So the
> overall convergence time will depend on how/when those two things happen in
> time. Only the DF PE can forward traffic. A non-DF can never forward
> traffic or there will be risk of duplicate packets.*
>
>
>
> 2.       Will all the nodes in backup mode forward the packet before DF
> election?
>
> [JORGE] Only the new DF can forward.
>
>
>
> 3. If they forward, how is duplicate packets handled, in this case?
>
> [JORGE] see above.
>
>
>
> My two cents..
>
>
>
> Thanks.
>
> Jorge
>
>
>
>
>
>
>
> *From: *BESS <bess-bounces@ietf.org> on behalf of Jaikumar Somasundaram <
> jaikumar.somasundaram@ericsson.com>
> *Date: *Thursday, October 4, 2018 at 10:03 AM
> *To: *"bess@ietf.org" <bess@ietf.org>
> *Cc: *Jiang He <jiang.he@ericsson.com>, P Muthu Arul Mozhi <
> p.muthu.arul.mozhi@ericsson.com>
> *Subject: *[bess] EVPN MH: Backup node behavior in Primary Path Failure
>
>
>
> Hello Everyone,
>
>
>
> Sorry if it is a duplicate. I repost this query as I did not receive any
> response yet.
>
> (I was wondering if this mail already reached the group or not)
>
>
>
> I have a question on Primary PE encountering a failure in EVPN multihoming
>
> in single active mode.
>
>
>
> RFC7432, section 14.1.1:
>
> <snip>
>
>    If there is more than one backup PE for a given ES, the remote PE
>
>    MUST use the primary PE's withdrawal of its set of Ethernet A-D per
>
>    ES routes as a trigger to start flooding traffic for the associated
>
>    MAC addresses (as long as flooding of unknown unicast packets is
>
>    administratively allowed), as it is not possible to select a single
>
>    backup PE.
>
> </snip>
>
>
>
> Questions:
>
> 1. Will the node in backup mode forward the packet to CE?
>
> 2. Will all the nodes in backup mode forward the packet before DF election?
>
> 3. If they forward, how is duplicate packets handled, in this case?
>
>
>
> Please help me anwere these questions.
>
>
>
> Thanks & Regards
>
> Jaikumar S
>
>
> _______________________________________________
> BESS mailing list
> BESS@ietf.org
> https://www.ietf.org/mailman/listinfo/bess
>

--000000000000dd2747057765413f
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif;font-size:small">Please see inline..</div><br><div class=
=3D"gmail_quote"><div dir=3D"ltr">On Thu, Oct 4, 2018 at 3:33 PM Rabadan, J=
orge (Nokia - US/Mountain View) &lt;<a href=3D"mailto:jorge.rabadan@nokia.c=
om">jorge.rabadan@nokia.com</a>&gt; wrote:<br></div><blockquote class=3D"gm=
ail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-le=
ft:1ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"m_-2386179909272137706WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">In-line.<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:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><b><span style=3D"font-=
size:12.0pt;color:black">From:
</span></b><span style=3D"font-size:12.0pt;color:black">Jaikumar Somasundar=
am &lt;<a href=3D"mailto:jaikumar.somasundaram@ericsson.com" target=3D"_bla=
nk">jaikumar.somasundaram@ericsson.com</a>&gt;<br>
<b>Date: </b>Thursday, October 4, 2018 at 11:28 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;, &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">b=
ess@ietf.org</a>&gt;<br>
<b>Cc: </b>Jiang He &lt;<a href=3D"mailto:jiang.he@ericsson.com" target=3D"=
_blank">jiang.he@ericsson.com</a>&gt;, P Muthu Arul Mozhi &lt;<a href=3D"ma=
ilto:p.muthu.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@=
ericsson.com</a>&gt;<br>
<b>Subject: </b>RE: [bess] EVPN MH: Backup node behavior in Primary Path Fa=
ilure<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><u></u>=C2=A0<u></u></p=
>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#0=
070c0">Thanks Jorge for the quick reply.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"color:#0=
070c0">Please find further question below.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">=C2=A0<u></u><u></u></p=
>
<div>
<div style=3D"border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><b>From:</b> Rabadan, J=
orge (Nokia - US/Mountain View) &lt;<a href=3D"mailto:jorge.rabadan@nokia.c=
om" target=3D"_blank">jorge.rabadan@nokia.com</a>&gt;
<br>
<b>Sent:</b> Thursday, October 4, 2018 1:52 PM<br>
<b>To:</b> Jaikumar Somasundaram &lt;<a href=3D"mailto:jaikumar.somasundara=
m@ericsson.com" target=3D"_blank">jaikumar.somasundaram@ericsson.com</a>&gt=
;; <a href=3D"mailto:bess@ietf.org" target=3D"_blank">bess@ietf.org</a><br>
<b>Cc:</b> Jiang He &lt;<a href=3D"mailto:jiang.he@ericsson.com" target=3D"=
_blank">jiang.he@ericsson.com</a>&gt;; P Muthu Arul Mozhi &lt;<a href=3D"ma=
ilto:p.muthu.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@=
ericsson.com</a>&gt;<br>
<b>Subject:</b> Re: [bess] EVPN MH: Backup node behavior in Primary Path Fa=
ilure<u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">=C2=A0<u></u><u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:10.5pt;font-family:Consolas">Hi,</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:10.5pt;font-family:Consolas">=C2=A0</span><u></u><u></u></p>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:72.0pt=
">Questions:<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:90.0pt">
<u></u><span>1.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span><u></u>Will the node in backup mode forward the packet to CE?=
<u></u><u></u></p>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:36.0pt=
">[JORGE] as soon as it becomes DF it can forward packets to the CE. The ba=
ckup node will have to run DF election upon the ES route withdrawal from th=
e primary. If AC-DF is enabled, it can also react to the withdrawal
 of AD routes from the primary PE.<u></u><u></u></p>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:36.0pt=
"><b><i>[Jai] Does that mean if any packet comes to a node that is still in=
 the backup mode will get dropped, before the new DF election is complete? =
Why cant this be used as FRR? Or what is the use case of having
 backup node(s)?<u></u><u></u></i></b></p>
<p class=3D"m_-2386179909272137706MsoPlainText"><b><span style=3D"font-size=
:10.5pt;font-family:Consolas">[JORGE2] when the primary node fails, ES and =
AD routes are withdrawn. </span></b></p></div></div></blockquote><div><div =
class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;fon=
t-size:small">Suppose we have a full mesh of iBGP sessions b/w the PEs, the=
n who would withdraw the routes if the primary PE / DF itself fails? Instea=
d, the BGP session would timeout causing the primary PE&#39;s neighbors to =
flush out the A-D routes received from the primary PE, right? This can take=
 several seconds, isn&#39;t it?</div><div class=3D"gmail_default" style=3D"=
font-family:arial,helvetica,sans-serif;font-size:small"><br></div><div clas=
s=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif;font-si=
ze:small">Regards,</div><div class=3D"gmail_default" style=3D"font-family:a=
rial,helvetica,sans-serif;font-size:small">Muthu</div></div><blockquote cla=
ss=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;pa=
dding-left:1ex"><div lang=3D"EN-US" link=3D"blue" vlink=3D"purple"><div cla=
ss=3D"m_-2386179909272137706WordSection1"><p class=3D"m_-238617990927213770=
6MsoPlainText"><b><span style=3D"font-size:10.5pt;font-family:Consolas">The=
 AD route withdrawal is an indication for remote nodes that they have to se=
nd traffic to the backup (for
 a given MAC) or to flush the MACs if there are more than 2 PEs in the ES. =
Around the same time or maybe earlier, the ES route withdrawal will make th=
e backup PE take over as DF. So the overall convergence time will depend on=
 how/when those two things happen
 in time. Only the DF PE can forward traffic. A non-DF can never forward tr=
affic or there will be risk of duplicate packets.<u></u><u></u></span></b><=
/p>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:36.0pt=
">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:90.0pt">
<u></u><span>2.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span><u></u>Will all the nodes in backup mode forward the packet b=
efore DF election?<u></u><u></u></p>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:36.0pt=
">[JORGE] Only the new DF can forward.<u></u><u></u></p>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:36.0pt=
">=C2=A0<u></u><u></u></p>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:72.0pt=
">3. If they forward, how is duplicate packets handled, in this case?<u></u=
><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:10.5pt;font-family:Consolas">[JORGE] see above.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:10.5pt;font-family:Consolas">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:10.5pt;font-family:Consolas">My two cents..</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:10.5pt;font-family:Consolas">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:10.5pt;font-family:Consolas">Thanks.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:10.5pt;font-family:Consolas">Jorge</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:10.5pt;font-family:Consolas">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:10.5pt;font-family:Consolas">=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:10.5pt;font-family:Consolas">=C2=A0</span><u></u><u></u></p>
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><b><span style=3D"font-=
size:12.0pt;color:black">From:
</span></b><span style=3D"font-size:12.0pt;color:black">BESS &lt;<a href=3D=
"mailto:bess-bounces@ietf.org" target=3D"_blank">bess-bounces@ietf.org</a>&=
gt; on behalf of Jaikumar Somasundaram &lt;<a href=3D"mailto:jaikumar.somas=
undaram@ericsson.com" target=3D"_blank">jaikumar.somasundaram@ericsson.com<=
/a>&gt;<br>
<b>Date: </b>Thursday, October 4, 2018 at 10:03 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>Jiang He &lt;<a href=3D"mailto:jiang.he@ericsson.com" target=3D"=
_blank">jiang.he@ericsson.com</a>&gt;, P Muthu Arul Mozhi &lt;<a href=3D"ma=
ilto:p.muthu.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@=
ericsson.com</a>&gt;<br>
<b>Subject: </b>[bess] EVPN MH: Backup node behavior in Primary Path Failur=
e</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">=C2=A0<u></u><u></u></p=
>
</div>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:72.0pt=
">Hello Everyone,<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">=C2=A0<u></u><u></u></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">Sorry if it is a duplic=
ate. I repost this query as I did not receive any response yet.<u></u><u></=
u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">(I was wondering if thi=
s mail already reached the group or not)<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">=C2=A0<u></u><u></u></p=
>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:72.0pt=
">I have a question on Primary PE encountering a failure in EVPN multihomin=
g<u></u><u></u></p>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:72.0pt=
">in single active mode.<u></u><u></u></p>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:72.0pt=
">=C2=A0<u></u><u></u></p>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:72.0pt=
">RFC7432, section 14.1.1:<u></u><u></u></p>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:72.0pt=
"><span style=3D"font-family:&quot;Courier New&quot;">&lt;snip&gt;</span><u=
></u><u></u></p>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:72.0pt=
"><span style=3D"font-family:&quot;Courier New&quot;">=C2=A0=C2=A0 If there=
 is more than one backup PE for a given ES, the remote PE</span><u></u><u><=
/u></p>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:72.0pt=
"><span style=3D"font-family:&quot;Courier New&quot;">=C2=A0=C2=A0 MUST use=
 the primary PE&#39;s withdrawal of its set of Ethernet A-D per</span><u></=
u><u></u></p>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:72.0pt=
"><span style=3D"font-family:&quot;Courier New&quot;">=C2=A0=C2=A0 ES route=
s as a trigger to start flooding traffic for the associated</span><u></u><u=
></u></p>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:72.0pt=
"><span style=3D"font-family:&quot;Courier New&quot;">=C2=A0=C2=A0 MAC addr=
esses (as long as flooding of unknown unicast packets is</span><u></u><u></=
u></p>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:72.0pt=
"><span style=3D"font-family:&quot;Courier New&quot;">=C2=A0=C2=A0 administ=
ratively allowed), as it is not possible to select a single</span><u></u><u=
></u></p>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:72.0pt=
"><span style=3D"font-family:&quot;Courier New&quot;">=C2=A0=C2=A0 backup P=
E.</span><u></u><u></u></p>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:72.0pt=
"><span style=3D"font-family:&quot;Courier New&quot;">&lt;/snip&gt;</span><=
u></u><u></u></p>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:72.0pt=
">=C2=A0<u></u><u></u></p>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:72.0pt=
">Questions:<u></u><u></u></p>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:72.0pt=
">1. Will the node in backup mode forward the packet to CE?<u></u><u></u></=
p>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:72.0pt=
">2. Will all the nodes in backup mode forward the packet before DF electio=
n?<u></u><u></u></p>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:72.0pt=
">3. If they forward, how is duplicate packets handled, in this case?<u></u=
><u></u></p>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:72.0pt=
">=C2=A0<u></u><u></u></p>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:72.0pt=
">Please help me anwere these questions.<u></u><u></u></p>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:72.0pt=
">=C2=A0<u></u><u></u></p>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:72.0pt=
">Thanks &amp; Regards<u></u><u></u></p>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:72.0pt=
">Jaikumar S<u></u><u></u></p>
<p class=3D"m_-2386179909272137706MsoPlainText" style=3D"margin-left:72.0pt=
">=C2=A0<u></u><u></u></p>
</div>
</div>

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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: Jiang He <jiang.he@ericsson.com>, P Muthu Arul Mozhi <p.muthu.arul.mozhi@ericsson.com>
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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@ericsson.com" <jaikumar.somasundaram@ericsson.com>,  "bess@ietf.org" <bess@ietf.org>, "jiang.he@ericsson.com" <jiang.he@ericsson.com>, "p.muthu.arul.mozhi@ericsson.com" <p.muthu.arul.mozhi@ericsson.com>
Thread-Topic: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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From: Eric Rosen <erosen@juniper.net>
To: Brian Carpenter <brian.e.carpenter@gmail.com>, "gen-art@ietf.org" <gen-art@ietf.org>
CC: "draft-ietf-bess-mvpn-expl-track.all@ietf.org" <draft-ietf-bess-mvpn-expl-track.all@ietf.org>, "bess@ietf.org" <bess@ietf.org>
Thread-Topic: Genart last call review of draft-ietf-bess-mvpn-expl-track-10
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Date: Thu, 4 Oct 2018 15:15:13 +0000
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Subject: Re: [bess] Genart last call review of draft-ietf-bess-mvpn-expl-track-10
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References: <067ED9A1-F8D0-4C53-97A0-3E6FA7E063EC@nokia.com> <VI1PR07MB4302D68B2828F10E49C834A486EA0@VI1PR07MB4302.eurprd07.prod.outlook.com> <D4979895-D9D9-434D-A247-62682E678853@nokia.com> <CAKz0y8zP+h+=tvEiiM=5MZxzdtk43_jOJ8BxtgENs5D-Orx98Q@mail.gmail.com> <19D6CCFE-183E-4BF7-A7D2-7D5F9DA96D7A@nokia.com>
In-Reply-To: <19D6CCFE-183E-4BF7-A7D2-7D5F9DA96D7A@nokia.com>
From: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
Date: Thu, 4 Oct 2018 21:07:08 +0530
Message-ID: <CAKz0y8xzxNv2EBuCmUC2r5=tDozc1th41Ao0dbdVXcAbEQLJRw@mail.gmail.com>
To: jorge.rabadan@nokia.com
Cc: jaikumar.somasundaram@ericsson.com, bess@ietf.org, jiang.he@ericsson.com,  p.muthu.arul.mozhi@ericsson.com
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/b-qNFbjihMKzEYq3C4n8LKhQNxQ>
Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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Thanks, Jorge. This is inline with my thinking. So, in single-active
multihoming, once the primary is dead we don't need to wait for the DF
election to happen for the backup (or some other PE in the ES) to become
active and start forwarding traffic over the ES, instead it only requires
the remote PEs and backup to realize that the primary is dead (thru' NH
tracking / BFD) and start forwarding over the ES, right?

Regards,
Muthu

On Thu, Oct 4, 2018 at 8:10 PM Rabadan, Jorge (Nokia - US/Mountain View) <
jorge.rabadan@nokia.com> wrote:

> Muthu,
>
>
>
> About this:
>
>
>
> Suppose we have a full mesh of iBGP sessions b/w the PEs, then who would
> withdraw the routes if the primary PE / DF itself fails? Instead, the BGP
> session would timeout causing the primary PE's neighbors to flush out the
> A-D routes received from the primary PE, right? This can take several
> seconds, isn't it?
>
>
>
> No, not in the implementations I know of. Next Hop tracking will
> immediately detect that the PE is not in the network anymore and the rout=
es
> will be invalidated. You can also bootstrap the BGP sessions to BFD.
>
> But that has nothing to do with EVPN!.. it=E2=80=99s regular BGP.
>
>
>
> Thx
>
> Jorge
>
>
>
> *From: *Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
> *Date: *Thursday, October 4, 2018 at 1:14 PM
> *To: *"Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.co=
m
> >
> *Cc: *"jaikumar.somasundaram@ericsson.com" <
> jaikumar.somasundaram@ericsson.com>, "bess@ietf.org" <bess@ietf.org>, "
> jiang.he@ericsson.com" <jiang.he@ericsson.com>, "
> p.muthu.arul.mozhi@ericsson.com" <p.muthu.arul.mozhi@ericsson.com>
> *Subject: *Re: [bess] EVPN MH: Backup node behavior in Primary Path
> Failure
>
>
>
> Please see inline..
>
>
>
> On Thu, Oct 4, 2018 at 3:33 PM Rabadan, Jorge (Nokia - US/Mountain View) =
<
> jorge.rabadan@nokia.com> wrote:
>
> In-line.
>
>
>
> Thx
>
> Jorge
>
>
>
> *From: *Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com>
> *Date: *Thursday, October 4, 2018 at 11:28 AM
> *To: *"Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.co=
m>,
> "bess@ietf.org" <bess@ietf.org>
> *Cc: *Jiang He <jiang.he@ericsson.com>, P Muthu Arul Mozhi <
> p.muthu.arul.mozhi@ericsson.com>
> *Subject: *RE: [bess] EVPN MH: Backup node behavior in Primary Path
> Failure
>
>
>
> Thanks Jorge for the quick reply.
>
> Please find further question below.
>
>
>
> *From:* Rabadan, Jorge (Nokia - US/Mountain View) <jorge.rabadan@nokia.co=
m>
>
> *Sent:* Thursday, October 4, 2018 1:52 PM
> *To:* Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com>;
> bess@ietf.org
> *Cc:* Jiang He <jiang.he@ericsson.com>; P Muthu Arul Mozhi <
> p.muthu.arul.mozhi@ericsson.com>
> *Subject:* Re: [bess] EVPN MH: Backup node behavior in Primary Path
> Failure
>
>
>
> Hi,
>
>
>
> Questions:
>
> 1.       Will the node in backup mode forward the packet to CE?
>
> [JORGE] as soon as it becomes DF it can forward packets to the CE. The
> backup node will have to run DF election upon the ES route withdrawal fro=
m
> the primary. If AC-DF is enabled, it can also react to the withdrawal of =
AD
> routes from the primary PE.
>
> *[Jai] Does that mean if any packet comes to a node that is still in the
> backup mode will get dropped, before the new DF election is complete? Why
> cant this be used as FRR? Or what is the use case of having backup node(s=
)?*
>
> *[JORGE2] when the primary node fails, ES and AD routes are withdrawn. *
>
> Suppose we have a full mesh of iBGP sessions b/w the PEs, then who would
> withdraw the routes if the primary PE / DF itself fails? Instead, the BGP
> session would timeout causing the primary PE's neighbors to flush out the
> A-D routes received from the primary PE, right? This can take several
> seconds, isn't it?
>
>
>
> Regards,
>
> Muthu
>
> *The AD route withdrawal is an indication for remote nodes that they have
> to send traffic to the backup (for a given MAC) or to flush the MACs if
> there are more than 2 PEs in the ES. Around the same time or maybe earlie=
r,
> the ES route withdrawal will make the backup PE take over as DF. So the
> overall convergence time will depend on how/when those two things happen =
in
> time. Only the DF PE can forward traffic. A non-DF can never forward
> traffic or there will be risk of duplicate packets.*
>
>
>
> 2.       Will all the nodes in backup mode forward the packet before DF
> election?
>
> [JORGE] Only the new DF can forward.
>
>
>
> 3. If they forward, how is duplicate packets handled, in this case?
>
> [JORGE] see above.
>
>
>
> My two cents..
>
>
>
> Thanks.
>
> Jorge
>
>
>
>
>
>
>
> *From: *BESS <bess-bounces@ietf.org> on behalf of Jaikumar Somasundaram <
> jaikumar.somasundaram@ericsson.com>
> *Date: *Thursday, October 4, 2018 at 10:03 AM
> *To: *"bess@ietf.org" <bess@ietf.org>
> *Cc: *Jiang He <jiang.he@ericsson.com>, P Muthu Arul Mozhi <
> p.muthu.arul.mozhi@ericsson.com>
> *Subject: *[bess] EVPN MH: Backup node behavior in Primary Path Failure
>
>
>
> Hello Everyone,
>
>
>
> Sorry if it is a duplicate. I repost this query as I did not receive any
> response yet.
>
> (I was wondering if this mail already reached the group or not)
>
>
>
> I have a question on Primary PE encountering a failure in EVPN multihomin=
g
>
> in single active mode.
>
>
>
> RFC7432, section 14.1.1:
>
> <snip>
>
>    If there is more than one backup PE for a given ES, the remote PE
>
>    MUST use the primary PE's withdrawal of its set of Ethernet A-D per
>
>    ES routes as a trigger to start flooding traffic for the associated
>
>    MAC addresses (as long as flooding of unknown unicast packets is
>
>    administratively allowed), as it is not possible to select a single
>
>    backup PE.
>
> </snip>
>
>
>
> Questions:
>
> 1. Will the node in backup mode forward the packet to CE?
>
> 2. Will all the nodes in backup mode forward the packet before DF electio=
n?
>
> 3. If they forward, how is duplicate packets handled, in this case?
>
>
>
> Please help me anwere these questions.
>
>
>
> 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 class=3D"gmail_default" style=3D"font-family:arial,he=
lvetica,sans-serif;font-size:small">Thanks, Jorge. This is inline with my t=
hinking. So, in single-active multihoming, once the primary is dead we don&=
#39;t need to wait for the DF election to happen for the backup (or some ot=
her PE in the ES) to become active and start forwarding traffic over the ES=
, instead it only requires the remote PEs and backup to realize that the pr=
imary is dead (thru&#39; NH tracking / BFD) and start forwarding over the E=
S, right?</div><div class=3D"gmail_default" style=3D"font-family:arial,helv=
etica,sans-serif;font-size:small"><br></div><div class=3D"gmail_default" st=
yle=3D"font-family:arial,helvetica,sans-serif;font-size:small">Regards,</di=
v><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-se=
rif;font-size:small">Muthu</div><div class=3D"gmail_default" style=3D"font-=
family:arial,helvetica,sans-serif;font-size:small"><br></div><div class=3D"=
gmail_quote"><div dir=3D"ltr">On Thu, Oct 4, 2018 at 8:10 PM 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:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1=
ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"m_-409024311180145859WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">Muthu,<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=
">About this:<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" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:12.0pt;font-family:&quot;Arial&quot;,sans-serif">Suppose we have a full m=
esh of iBGP sessions b/w the PEs, then who would withdraw the routes if the=
 primary PE / DF itself fails? Instead, the BGP
 session would timeout causing the primary PE&#39;s neighbors to flush out =
the A-D routes received from the primary PE, right? This can take several s=
econds, isn&#39;t it?<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ar=
ial&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">No, not in the implementations I know of. Next Hop tracking will immediat=
ely detect that the PE is not in the network anymore and the routes will be=
 invalidated. You can also bootstrap
 the BGP sessions to BFD. <u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">But that has nothing to do with EVPN!.. it=E2=80=99s regular BGP.<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:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><b><span style=3D"font-=
size:12.0pt;color:black">From:
</span></b><span style=3D"font-size:12.0pt;color:black">Muthu Arul Mozhi Pe=
rumal &lt;<a href=3D"mailto:muthu.arul@gmail.com" target=3D"_blank">muthu.a=
rul@gmail.com</a>&gt;<br>
<b>Date: </b>Thursday, October 4, 2018 at 1:14 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>&quot;<a href=3D"mailto:jaikumar.somasundaram@ericsson.com" targ=
et=3D"_blank">jaikumar.somasundaram@ericsson.com</a>&quot; &lt;<a href=3D"m=
ailto:jaikumar.somasundaram@ericsson.com" target=3D"_blank">jaikumar.somasu=
ndaram@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" ta=
rget=3D"_blank">bess@ietf.org</a>&gt;, &quot;<a href=3D"mailto:jiang.he@eri=
csson.com" target=3D"_blank">jiang.he@ericsson.com</a>&quot; &lt;<a href=3D=
"mailto:jiang.he@ericsson.com" target=3D"_blank">jiang.he@ericsson.com</a>&=
gt;, &quot;<a href=3D"mailto:p.muthu.arul.mozhi@ericsson.com" target=3D"_bl=
ank">p.muthu.arul.mozhi@ericsson.com</a>&quot; &lt;<a href=3D"mailto:p.muth=
u.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@ericsson.co=
m</a>&gt;<br>
<b>Subject: </b>Re: [bess] EVPN MH: Backup node behavior in Primary Path Fa=
ilure<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><u></u>=C2=A0<u></u></p=
>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:12.0pt;font-family:&quot;Arial&quot;,sans-serif">Please see inline..<u></=
u><u></u></span></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><u></u>=C2=A0<u></u></p=
>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">On Thu, Oct 4, 2018 at =
3:33 PM Rabadan, Jorge (Nokia - US/Mountain View) &lt;<a href=3D"mailto:jor=
ge.rabadan@nokia.com" target=3D"_blank">jorge.rabadan@nokia.com</a>&gt; wro=
te:<u></u><u></u></p>
</div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">In-line.</span><u></u=
><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<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:36.0pt">
<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:36.0pt">
<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:36.0pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">=C2=A0</span><u></u><=
u></u></p>
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<b><span style=3D"font-size:12.0pt;color:black">From: </span></b><span styl=
e=3D"font-size:12.0pt;color:black">Jaikumar Somasundaram &lt;<a href=3D"mai=
lto:jaikumar.somasundaram@ericsson.com" target=3D"_blank">jaikumar.somasund=
aram@ericsson.com</a>&gt;<br>
<b>Date: </b>Thursday, October 4, 2018 at 11:28 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;, &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">b=
ess@ietf.org</a>&gt;<br>
<b>Cc: </b>Jiang He &lt;<a href=3D"mailto:jiang.he@ericsson.com" target=3D"=
_blank">jiang.he@ericsson.com</a>&gt;, P Muthu Arul Mozhi &lt;<a href=3D"ma=
ilto:p.muthu.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@=
ericsson.com</a>&gt;<br>
<b>Subject: </b>RE: [bess] EVPN MH: Backup node behavior in Primary Path Fa=
ilure</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
=C2=A0<u></u><u></u></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"color:#0070c0">Thanks Jorge for the quick reply.</span><u></=
u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"color:#0070c0">Please find further question below.</span><u>=
</u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
=C2=A0<u></u><u></u></p>
<div>
<div style=3D"border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<b>From:</b> Rabadan, Jorge (Nokia - US/Mountain View) &lt;<a href=3D"mailt=
o:jorge.rabadan@nokia.com" target=3D"_blank">jorge.rabadan@nokia.com</a>&gt=
;
<br>
<b>Sent:</b> Thursday, October 4, 2018 1:52 PM<br>
<b>To:</b> Jaikumar Somasundaram &lt;<a href=3D"mailto:jaikumar.somasundara=
m@ericsson.com" target=3D"_blank">jaikumar.somasundaram@ericsson.com</a>&gt=
;;
<a href=3D"mailto:bess@ietf.org" target=3D"_blank">bess@ietf.org</a><br>
<b>Cc:</b> Jiang He &lt;<a href=3D"mailto:jiang.he@ericsson.com" target=3D"=
_blank">jiang.he@ericsson.com</a>&gt;; P Muthu Arul Mozhi &lt;<a href=3D"ma=
ilto:p.muthu.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@=
ericsson.com</a>&gt;<br>
<b>Subject:</b> Re: [bess] EVPN MH: Backup node behavior in Primary Path Fa=
ilure<u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<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:72.0pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">=C2=A0</span><u></u><=
u></u></p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">Questions:<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:126.0pt">
1.<span style=3D"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,se=
rif">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 </span>
Will the node in backup mode forward the packet to CE?<u></u><u></u></p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:72.0pt">[JORGE] as soon as it becomes DF it can forward pac=
kets to the CE. The backup node will have to run DF election upon the ES ro=
ute withdrawal from the primary. If AC-DF is enabled, it can
 also react to the withdrawal of AD routes from the primary PE.<u></u><u></=
u></p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:72.0pt"><b><i>[Jai] Does that mean if any packet comes to a=
 node that is still in the backup mode will get dropped, before the new DF =
election is complete? Why cant this be used as FRR? Or what
 is the use case of having backup node(s)?</i></b><u></u><u></u></p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:36.0pt"><b><span style=3D"font-size:10.5pt;font-family:Cons=
olas">[JORGE2] when the primary node fails, ES and AD routes are withdrawn.
</span></b><u></u><u></u></p>
</div>
</div>
</blockquote>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:12.0pt;font-family:&quot;Arial&quot;,sans-serif">Suppose we have a full m=
esh of iBGP sessions b/w the PEs, then who would withdraw the routes if the=
 primary PE / DF itself fails? Instead, the BGP
 session would timeout causing the primary PE&#39;s neighbors to flush out =
the A-D routes received from the primary PE, right? This can take several s=
econds, isn&#39;t it?<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:12.0pt;font-family:&quot;Arial&quot;,sans-serif"><u></u>=C2=A0<u></u></sp=
an></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:12.0pt;font-family:&quot;Arial&quot;,sans-serif">Regards,<u></u><u></u></=
span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:12.0pt;font-family:&quot;Arial&quot;,sans-serif">Muthu<u></u><u></u></spa=
n></p>
</div>
</div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:36.0pt"><b><span style=3D"font-size:10.5pt;font-family:Cons=
olas">The AD route withdrawal is an indication for remote nodes that they h=
ave to send traffic to the backup (for a given MAC) or to flush
 the MACs if there are more than 2 PEs in the ES. Around the same time or m=
aybe earlier, the ES route withdrawal will make the backup PE take over as =
DF. So the overall convergence time will depend on how/when those two thing=
s happen in time. Only the DF PE
 can forward traffic. A non-DF can never forward traffic or there will be r=
isk of duplicate packets.</span></b><u></u><u></u></p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:72.0pt">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:126.0pt">
2.<span style=3D"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,se=
rif">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 </span>
Will all the nodes in backup mode forward the packet before DF election?<u>=
</u><u></u></p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:72.0pt">[JORGE] Only the new DF can forward.<u></u><u></u><=
/p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:72.0pt">=C2=A0<u></u><u></u></p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">3. If they forward, how is duplicate packets handl=
ed, in this case?<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">[JORGE] see above.</s=
pan><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<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:72.0pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">My two cents..</span>=
<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<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:72.0pt">
<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:72.0pt">
<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:72.0pt">
<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:72.0pt">
<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:72.0pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">=C2=A0</span><u></u><=
u></u></p>
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt">
<b><span style=3D"font-size:12.0pt;color:black">From: </span></b><span styl=
e=3D"font-size:12.0pt;color:black">BESS &lt;<a href=3D"mailto:bess-bounces@=
ietf.org" target=3D"_blank">bess-bounces@ietf.org</a>&gt; on behalf of Jaik=
umar Somasundaram &lt;<a href=3D"mailto:jaikumar.somasundaram@ericsson.com"=
 target=3D"_blank">jaikumar.somasundaram@ericsson.com</a>&gt;<br>
<b>Date: </b>Thursday, October 4, 2018 at 10:03 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>Jiang He &lt;<a href=3D"mailto:jiang.he@ericsson.com" target=3D"=
_blank">jiang.he@ericsson.com</a>&gt;, P Muthu Arul Mozhi &lt;<a href=3D"ma=
ilto:p.muthu.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@=
ericsson.com</a>&gt;<br>
<b>Subject: </b>[bess] EVPN MH: Backup node behavior in Primary Path Failur=
e</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt">
=C2=A0<u></u><u></u></p>
</div>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">Hello Everyone,<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt">
=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt">
Sorry if it is a duplicate. I repost this query as I did not receive any re=
sponse yet.<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt">
(I was wondering if this mail already reached the group or not)<u></u><u></=
u></p>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt">
=C2=A0<u></u><u></u></p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">I have a question on Primary PE encountering a fai=
lure in EVPN multihoming<u></u><u></u></p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">in single active mode.<u></u><u></u></p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">=C2=A0<u></u><u></u></p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">RFC7432, section 14.1.1:<u></u><u></u></p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt"><span style=3D"font-family:&quot;Courier New&quot;=
">&lt;snip&gt;</span><u></u><u></u></p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt"><span style=3D"font-family:&quot;Courier New&quot;=
">=C2=A0=C2=A0 If there is more than one backup PE for a given ES, the remo=
te PE</span><u></u><u></u></p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt"><span style=3D"font-family:&quot;Courier New&quot;=
">=C2=A0=C2=A0 MUST use the primary PE&#39;s withdrawal of its set of Ether=
net A-D per</span><u></u><u></u></p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt"><span style=3D"font-family:&quot;Courier New&quot;=
">=C2=A0=C2=A0 ES routes as a trigger to start flooding traffic for the ass=
ociated</span><u></u><u></u></p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt"><span style=3D"font-family:&quot;Courier New&quot;=
">=C2=A0=C2=A0 MAC addresses (as long as flooding of unknown unicast packet=
s is</span><u></u><u></u></p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt"><span style=3D"font-family:&quot;Courier New&quot;=
">=C2=A0=C2=A0 administratively allowed), as it is not possible to select a=
 single</span><u></u><u></u></p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt"><span style=3D"font-family:&quot;Courier New&quot;=
">=C2=A0=C2=A0 backup PE.</span><u></u><u></u></p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt"><span style=3D"font-family:&quot;Courier New&quot;=
">&lt;/snip&gt;</span><u></u><u></u></p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">=C2=A0<u></u><u></u></p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">Questions:<u></u><u></u></p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">1. Will the node in backup mode forward the packet=
 to CE?<u></u><u></u></p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">2. Will all the nodes in backup mode forward the p=
acket before DF election?<u></u><u></u></p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">3. If they forward, how is duplicate packets handl=
ed, in this case?<u></u><u></u></p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">=C2=A0<u></u><u></u></p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">Please help me anwere these questions.<u></u><u></=
u></p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">=C2=A0<u></u><u></u></p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">Thanks &amp; Regards<u></u><u></u></p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">Jaikumar S<u></u><u></u></p>
<p class=3D"m_-409024311180145859m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">=C2=A0<u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">_______________________=
________________________<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>

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References: <067ED9A1-F8D0-4C53-97A0-3E6FA7E063EC@nokia.com> <VI1PR07MB4302D68B2828F10E49C834A486EA0@VI1PR07MB4302.eurprd07.prod.outlook.com> <D4979895-D9D9-434D-A247-62682E678853@nokia.com> <CAKz0y8zP+h+=tvEiiM=5MZxzdtk43_jOJ8BxtgENs5D-Orx98Q@mail.gmail.com> <19D6CCFE-183E-4BF7-A7D2-7D5F9DA96D7A@nokia.com>
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From: Anush Mohan <anush.iitm@gmail.com>
Date: Thu, 4 Oct 2018 21:17:30 +0530
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To: jorge.rabadan@nokia.com
Cc: muthu.arul@gmail.com, jiang.he@ericsson.com,  p.muthu.arul.mozhi@ericsson.com, bess@ietf.org,  jaikumar.somasundaram@ericsson.com
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/nYrCCWfyHmT6U1t-lQC-vOuFicg>
Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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Hi Jorge,

      Related to this topic, I had couple of queries as well. Could you
please clarify.

1.  I hope the section of RFC pasted by Jai is superceded by the particular
DF algorithm used. If all PEs can decide one particular backup PE for
Ethernet-segment based on HRW (for e.g),
     only that particular backup-PE can be used for unicasting traffic. We
can avoid flushing mac-entry in this case.

2.  If 'all-active' multihoming is used and a particular MAC is learnt from
multiple PEs on an Ethernet-segment, should we use 'mac-ip' route label for
load-balancing traffic or alias-label from
     'EAD/ESI' route. Or it doesn't matter.

Regards
Anush


On Thu, Oct 4, 2018 at 8:10 PM Rabadan, Jorge (Nokia - US/Mountain View) <
jorge.rabadan@nokia.com> wrote:

> Muthu,
>
>
>
> About this:
>
>
>
> Suppose we have a full mesh of iBGP sessions b/w the PEs, then who would
> withdraw the routes if the primary PE / DF itself fails? Instead, the BGP
> session would timeout causing the primary PE's neighbors to flush out the
> A-D routes received from the primary PE, right? This can take several
> seconds, isn't it?
>
>
>
> No, not in the implementations I know of. Next Hop tracking will
> immediately detect that the PE is not in the network anymore and the rout=
es
> will be invalidated. You can also bootstrap the BGP sessions to BFD.
>
> But that has nothing to do with EVPN!.. it=E2=80=99s regular BGP.
>
>
>
> Thx
>
> Jorge
>
>
>
> *From: *Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
> *Date: *Thursday, October 4, 2018 at 1:14 PM
> *To: *"Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.co=
m
> >
> *Cc: *"jaikumar.somasundaram@ericsson.com" <
> jaikumar.somasundaram@ericsson.com>, "bess@ietf.org" <bess@ietf.org>, "
> jiang.he@ericsson.com" <jiang.he@ericsson.com>, "
> p.muthu.arul.mozhi@ericsson.com" <p.muthu.arul.mozhi@ericsson.com>
> *Subject: *Re: [bess] EVPN MH: Backup node behavior in Primary Path
> Failure
>
>
>
> Please see inline..
>
>
>
> On Thu, Oct 4, 2018 at 3:33 PM Rabadan, Jorge (Nokia - US/Mountain View) =
<
> jorge.rabadan@nokia.com> wrote:
>
> In-line.
>
>
>
> Thx
>
> Jorge
>
>
>
> *From: *Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com>
> *Date: *Thursday, October 4, 2018 at 11:28 AM
> *To: *"Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.co=
m>,
> "bess@ietf.org" <bess@ietf.org>
> *Cc: *Jiang He <jiang.he@ericsson.com>, P Muthu Arul Mozhi <
> p.muthu.arul.mozhi@ericsson.com>
> *Subject: *RE: [bess] EVPN MH: Backup node behavior in Primary Path
> Failure
>
>
>
> Thanks Jorge for the quick reply.
>
> Please find further question below.
>
>
>
> *From:* Rabadan, Jorge (Nokia - US/Mountain View) <jorge.rabadan@nokia.co=
m>
>
> *Sent:* Thursday, October 4, 2018 1:52 PM
> *To:* Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com>;
> bess@ietf.org
> *Cc:* Jiang He <jiang.he@ericsson.com>; P Muthu Arul Mozhi <
> p.muthu.arul.mozhi@ericsson.com>
> *Subject:* Re: [bess] EVPN MH: Backup node behavior in Primary Path
> Failure
>
>
>
> Hi,
>
>
>
> Questions:
>
> 1.       Will the node in backup mode forward the packet to CE?
>
> [JORGE] as soon as it becomes DF it can forward packets to the CE. The
> backup node will have to run DF election upon the ES route withdrawal fro=
m
> the primary. If AC-DF is enabled, it can also react to the withdrawal of =
AD
> routes from the primary PE.
>
> *[Jai] Does that mean if any packet comes to a node that is still in the
> backup mode will get dropped, before the new DF election is complete? Why
> cant this be used as FRR? Or what is the use case of having backup node(s=
)?*
>
> *[JORGE2] when the primary node fails, ES and AD routes are withdrawn. *
>
> Suppose we have a full mesh of iBGP sessions b/w the PEs, then who would
> withdraw the routes if the primary PE / DF itself fails? Instead, the BGP
> session would timeout causing the primary PE's neighbors to flush out the
> A-D routes received from the primary PE, right? This can take several
> seconds, isn't it?
>
>
>
> Regards,
>
> Muthu
>
> *The AD route withdrawal is an indication for remote nodes that they have
> to send traffic to the backup (for a given MAC) or to flush the MACs if
> there are more than 2 PEs in the ES. Around the same time or maybe earlie=
r,
> the ES route withdrawal will make the backup PE take over as DF. So the
> overall convergence time will depend on how/when those two things happen =
in
> time. Only the DF PE can forward traffic. A non-DF can never forward
> traffic or there will be risk of duplicate packets.*
>
>
>
> 2.       Will all the nodes in backup mode forward the packet before DF
> election?
>
> [JORGE] Only the new DF can forward.
>
>
>
> 3. If they forward, how is duplicate packets handled, in this case?
>
> [JORGE] see above.
>
>
>
> My two cents..
>
>
>
> Thanks.
>
> Jorge
>
>
>
>
>
>
>
> *From: *BESS <bess-bounces@ietf.org> on behalf of Jaikumar Somasundaram <
> jaikumar.somasundaram@ericsson.com>
> *Date: *Thursday, October 4, 2018 at 10:03 AM
> *To: *"bess@ietf.org" <bess@ietf.org>
> *Cc: *Jiang He <jiang.he@ericsson.com>, P Muthu Arul Mozhi <
> p.muthu.arul.mozhi@ericsson.com>
> *Subject: *[bess] EVPN MH: Backup node behavior in Primary Path Failure
>
>
>
> Hello Everyone,
>
>
>
> Sorry if it is a duplicate. I repost this query as I did not receive any
> response yet.
>
> (I was wondering if this mail already reached the group or not)
>
>
>
> I have a question on Primary PE encountering a failure in EVPN multihomin=
g
>
> in single active mode.
>
>
>
> RFC7432, section 14.1.1:
>
> <snip>
>
>    If there is more than one backup PE for a given ES, the remote PE
>
>    MUST use the primary PE's withdrawal of its set of Ethernet A-D per
>
>    ES routes as a trigger to start flooding traffic for the associated
>
>    MAC addresses (as long as flooding of unknown unicast packets is
>
>    administratively allowed), as it is not possible to select a single
>
>    backup PE.
>
> </snip>
>
>
>
> Questions:
>
> 1. Will the node in backup mode forward the packet to CE?
>
> 2. Will all the nodes in backup mode forward the packet before DF electio=
n?
>
> 3. If they forward, how is duplicate packets handled, in this case?
>
>
>
> Please help me anwere these questions.
>
>
>
> Thanks & Regards
>
> Jaikumar S
>
>
>
> _______________________________________________
> 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
>

--00000000000049aa7e05776913d8
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Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div>Hi Jorge,</div><div><br></div><div>=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 Related to this topic, I had couple of queries as well. Could =
you please clarify.<br></div><div><br></div><div>1.=C2=A0 I hope the sectio=
n of RFC pasted by Jai is superceded by the particular DF algorithm used. I=
f all PEs can decide one particular backup PE for Ethernet-segment based on=
 HRW (for e.g),</div><div>=C2=A0=C2=A0=C2=A0=C2=A0 only that particular bac=
kup-PE can be used for unicasting traffic. We can avoid flushing mac-entry =
in this case.</div><div><br></div><div></div><div>2.=C2=A0 If &#39;all-acti=
ve&#39; multihoming is used and a particular MAC is learnt from multiple PE=
s on an Ethernet-segment, should we use &#39;mac-ip&#39; route label for lo=
ad-balancing traffic or alias-label from <br></div><div>=C2=A0=C2=A0=C2=A0=
=C2=A0 &#39;EAD/ESI&#39; route. Or it doesn&#39;t matter.<br></div><div><di=
v><div><div dir=3D"ltr" class=3D"gmail_signature" data-smartmail=3D"gmail_s=
ignature"><div dir=3D"ltr"><br></div><div dir=3D"ltr"></div><div dir=3D"ltr=
">Regards <br>Anush</div></div></div><br><br><div class=3D"gmail_quote"><di=
v dir=3D"ltr">On Thu, Oct 4, 2018 at 8:10 PM Rabadan, Jorge (Nokia - US/Mou=
ntain View) &lt;<a href=3D"mailto:jorge.rabadan@nokia.com">jorge.rabadan@no=
kia.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"=
margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">





<div link=3D"blue" vlink=3D"purple" lang=3D"EN-US">
<div class=3D"m_-3613534404875679190WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">Muthu,<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=
">About this:<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" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:12.0pt;font-family:&quot;Arial&quot;,sans-serif">Suppose we have a full m=
esh of iBGP sessions b/w the PEs, then who would withdraw the routes if the=
 primary PE / DF itself fails? Instead, the BGP
 session would timeout causing the primary PE&#39;s neighbors to flush out =
the A-D routes received from the primary PE, right? This can take several s=
econds, isn&#39;t it?<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ar=
ial&quot;,sans-serif"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">No, not in the implementations I know of. Next Hop tracking will immediat=
ely detect that the PE is not in the network anymore and the routes will be=
 invalidated. You can also bootstrap
 the BGP sessions to BFD. <u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">But that has nothing to do with EVPN!.. it=E2=80=99s regular BGP.<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:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><b><span style=3D"font-=
size:12.0pt;color:black">From:
</span></b><span style=3D"font-size:12.0pt;color:black">Muthu Arul Mozhi Pe=
rumal &lt;<a href=3D"mailto:muthu.arul@gmail.com" target=3D"_blank">muthu.a=
rul@gmail.com</a>&gt;<br>
<b>Date: </b>Thursday, October 4, 2018 at 1:14 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>&quot;<a href=3D"mailto:jaikumar.somasundaram@ericsson.com" targ=
et=3D"_blank">jaikumar.somasundaram@ericsson.com</a>&quot; &lt;<a href=3D"m=
ailto:jaikumar.somasundaram@ericsson.com" target=3D"_blank">jaikumar.somasu=
ndaram@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" ta=
rget=3D"_blank">bess@ietf.org</a>&gt;, &quot;<a href=3D"mailto:jiang.he@eri=
csson.com" target=3D"_blank">jiang.he@ericsson.com</a>&quot; &lt;<a href=3D=
"mailto:jiang.he@ericsson.com" target=3D"_blank">jiang.he@ericsson.com</a>&=
gt;, &quot;<a href=3D"mailto:p.muthu.arul.mozhi@ericsson.com" target=3D"_bl=
ank">p.muthu.arul.mozhi@ericsson.com</a>&quot; &lt;<a href=3D"mailto:p.muth=
u.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@ericsson.co=
m</a>&gt;<br>
<b>Subject: </b>Re: [bess] EVPN MH: Backup node behavior in Primary Path Fa=
ilure<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><u></u>=C2=A0<u></u></p=
>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:12.0pt;font-family:&quot;Arial&quot;,sans-serif">Please see inline..<u></=
u><u></u></span></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><u></u>=C2=A0<u></u></p=
>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">On Thu, Oct 4, 2018 at =
3:33 PM Rabadan, Jorge (Nokia - US/Mountain View) &lt;<a href=3D"mailto:jor=
ge.rabadan@nokia.com" target=3D"_blank">jorge.rabadan@nokia.com</a>&gt; wro=
te:<u></u><u></u></p>
</div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">In-line.</span><u></u=
><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<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:36.0pt">
<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:36.0pt">
<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:36.0pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">=C2=A0</span><u></u><=
u></u></p>
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<b><span style=3D"font-size:12.0pt;color:black">From: </span></b><span styl=
e=3D"font-size:12.0pt;color:black">Jaikumar Somasundaram &lt;<a href=3D"mai=
lto:jaikumar.somasundaram@ericsson.com" target=3D"_blank">jaikumar.somasund=
aram@ericsson.com</a>&gt;<br>
<b>Date: </b>Thursday, October 4, 2018 at 11:28 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;, &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">b=
ess@ietf.org</a>&gt;<br>
<b>Cc: </b>Jiang He &lt;<a href=3D"mailto:jiang.he@ericsson.com" target=3D"=
_blank">jiang.he@ericsson.com</a>&gt;, P Muthu Arul Mozhi &lt;<a href=3D"ma=
ilto:p.muthu.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@=
ericsson.com</a>&gt;<br>
<b>Subject: </b>RE: [bess] EVPN MH: Backup node behavior in Primary Path Fa=
ilure</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
=C2=A0<u></u><u></u></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"color:#0070c0">Thanks Jorge for the quick reply.</span><u></=
u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"color:#0070c0">Please find further question below.</span><u>=
</u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
=C2=A0<u></u><u></u></p>
<div>
<div style=3D"border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<b>From:</b> Rabadan, Jorge (Nokia - US/Mountain View) &lt;<a href=3D"mailt=
o:jorge.rabadan@nokia.com" target=3D"_blank">jorge.rabadan@nokia.com</a>&gt=
;
<br>
<b>Sent:</b> Thursday, October 4, 2018 1:52 PM<br>
<b>To:</b> Jaikumar Somasundaram &lt;<a href=3D"mailto:jaikumar.somasundara=
m@ericsson.com" target=3D"_blank">jaikumar.somasundaram@ericsson.com</a>&gt=
;;
<a href=3D"mailto:bess@ietf.org" target=3D"_blank">bess@ietf.org</a><br>
<b>Cc:</b> Jiang He &lt;<a href=3D"mailto:jiang.he@ericsson.com" target=3D"=
_blank">jiang.he@ericsson.com</a>&gt;; P Muthu Arul Mozhi &lt;<a href=3D"ma=
ilto:p.muthu.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@=
ericsson.com</a>&gt;<br>
<b>Subject:</b> Re: [bess] EVPN MH: Backup node behavior in Primary Path Fa=
ilure<u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<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:72.0pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">=C2=A0</span><u></u><=
u></u></p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">Questions:<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:126.0pt">
1.<span style=3D"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,se=
rif">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 </span>
Will the node in backup mode forward the packet to CE?<u></u><u></u></p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:72.0pt">[JORGE] as soon as it becomes DF it can forward pac=
kets to the CE. The backup node will have to run DF election upon the ES ro=
ute withdrawal from the primary. If AC-DF is enabled, it can
 also react to the withdrawal of AD routes from the primary PE.<u></u><u></=
u></p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:72.0pt"><b><i>[Jai] Does that mean if any packet comes to a=
 node that is still in the backup mode will get dropped, before the new DF =
election is complete? Why cant this be used as FRR? Or what
 is the use case of having backup node(s)?</i></b><u></u><u></u></p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:36.0pt"><b><span style=3D"font-size:10.5pt;font-family:Cons=
olas">[JORGE2] when the primary node fails, ES and AD routes are withdrawn.
</span></b><u></u><u></u></p>
</div>
</div>
</blockquote>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:12.0pt;font-family:&quot;Arial&quot;,sans-serif">Suppose we have a full m=
esh of iBGP sessions b/w the PEs, then who would withdraw the routes if the=
 primary PE / DF itself fails? Instead, the BGP
 session would timeout causing the primary PE&#39;s neighbors to flush out =
the A-D routes received from the primary PE, right? This can take several s=
econds, isn&#39;t it?<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:12.0pt;font-family:&quot;Arial&quot;,sans-serif"><u></u>=C2=A0<u></u></sp=
an></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:12.0pt;font-family:&quot;Arial&quot;,sans-serif">Regards,<u></u><u></u></=
span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:12.0pt;font-family:&quot;Arial&quot;,sans-serif">Muthu<u></u><u></u></spa=
n></p>
</div>
</div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:36.0pt"><b><span style=3D"font-size:10.5pt;font-family:Cons=
olas">The AD route withdrawal is an indication for remote nodes that they h=
ave to send traffic to the backup (for a given MAC) or to flush
 the MACs if there are more than 2 PEs in the ES. Around the same time or m=
aybe earlier, the ES route withdrawal will make the backup PE take over as =
DF. So the overall convergence time will depend on how/when those two thing=
s happen in time. Only the DF PE
 can forward traffic. A non-DF can never forward traffic or there will be r=
isk of duplicate packets.</span></b><u></u><u></u></p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:72.0pt">=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:126.0pt">
2.<span style=3D"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,se=
rif">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 </span>
Will all the nodes in backup mode forward the packet before DF election?<u>=
</u><u></u></p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:72.0pt">[JORGE] Only the new DF can forward.<u></u><u></u><=
/p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:72.0pt">=C2=A0<u></u><u></u></p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">3. If they forward, how is duplicate packets handl=
ed, in this case?<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">[JORGE] see above.</s=
pan><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<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:72.0pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">My two cents..</span>=
<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<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:72.0pt">
<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:72.0pt">
<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:72.0pt">
<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:72.0pt">
<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:72.0pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">=C2=A0</span><u></u><=
u></u></p>
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt">
<b><span style=3D"font-size:12.0pt;color:black">From: </span></b><span styl=
e=3D"font-size:12.0pt;color:black">BESS &lt;<a href=3D"mailto:bess-bounces@=
ietf.org" target=3D"_blank">bess-bounces@ietf.org</a>&gt; on behalf of Jaik=
umar Somasundaram &lt;<a href=3D"mailto:jaikumar.somasundaram@ericsson.com"=
 target=3D"_blank">jaikumar.somasundaram@ericsson.com</a>&gt;<br>
<b>Date: </b>Thursday, October 4, 2018 at 10:03 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>Jiang He &lt;<a href=3D"mailto:jiang.he@ericsson.com" target=3D"=
_blank">jiang.he@ericsson.com</a>&gt;, P Muthu Arul Mozhi &lt;<a href=3D"ma=
ilto:p.muthu.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@=
ericsson.com</a>&gt;<br>
<b>Subject: </b>[bess] EVPN MH: Backup node behavior in Primary Path Failur=
e</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt">
=C2=A0<u></u><u></u></p>
</div>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">Hello Everyone,<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt">
=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt">
Sorry if it is a duplicate. I repost this query as I did not receive any re=
sponse yet.<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt">
(I was wondering if this mail already reached the group or not)<u></u><u></=
u></p>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt">
=C2=A0<u></u><u></u></p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">I have a question on Primary PE encountering a fai=
lure in EVPN multihoming<u></u><u></u></p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">in single active mode.<u></u><u></u></p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">=C2=A0<u></u><u></u></p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">RFC7432, section 14.1.1:<u></u><u></u></p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt"><span style=3D"font-family:&quot;Courier New&quot;=
">&lt;snip&gt;</span><u></u><u></u></p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt"><span style=3D"font-family:&quot;Courier New&quot;=
">=C2=A0=C2=A0 If there is more than one backup PE for a given ES, the remo=
te PE</span><u></u><u></u></p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt"><span style=3D"font-family:&quot;Courier New&quot;=
">=C2=A0=C2=A0 MUST use the primary PE&#39;s withdrawal of its set of Ether=
net A-D per</span><u></u><u></u></p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt"><span style=3D"font-family:&quot;Courier New&quot;=
">=C2=A0=C2=A0 ES routes as a trigger to start flooding traffic for the ass=
ociated</span><u></u><u></u></p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt"><span style=3D"font-family:&quot;Courier New&quot;=
">=C2=A0=C2=A0 MAC addresses (as long as flooding of unknown unicast packet=
s is</span><u></u><u></u></p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt"><span style=3D"font-family:&quot;Courier New&quot;=
">=C2=A0=C2=A0 administratively allowed), as it is not possible to select a=
 single</span><u></u><u></u></p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt"><span style=3D"font-family:&quot;Courier New&quot;=
">=C2=A0=C2=A0 backup PE.</span><u></u><u></u></p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt"><span style=3D"font-family:&quot;Courier New&quot;=
">&lt;/snip&gt;</span><u></u><u></u></p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">=C2=A0<u></u><u></u></p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">Questions:<u></u><u></u></p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">1. Will the node in backup mode forward the packet=
 to CE?<u></u><u></u></p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">2. Will all the nodes in backup mode forward the p=
acket before DF election?<u></u><u></u></p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">3. If they forward, how is duplicate packets handl=
ed, in this case?<u></u><u></u></p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">=C2=A0<u></u><u></u></p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">Please help me anwere these questions.<u></u><u></=
u></p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">=C2=A0<u></u><u></u></p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">Thanks &amp; Regards<u></u><u></u></p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">Jaikumar S<u></u><u></u></p>
<p class=3D"m_-3613534404875679190m-2386179909272137706msoplaintext" style=
=3D"margin-left:108.0pt">=C2=A0<u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">_______________________=
________________________<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>

_______________________________________________<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></div></div>

--00000000000049aa7e05776913d8--


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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: Jiang He <jiang.he@ericsson.com>, P Muthu Arul Mozhi <p.muthu.arul.mozhi@ericsson.com>
Thread-Topic: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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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: Jiang He <jiang.he@ericsson.com>, P Muthu Arul Mozhi <p.muthu.arul.mozhi@ericsson.com>
Thread-Topic: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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Subject: [bess] I-D Action: draft-ietf-bess-mvpn-expl-track-11.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           : Explicit Tracking with Wild Card Routes in Multicast VPN
        Authors         : Andrew Dolganow
                          Jayant Kotalwar
                          Eric C. Rosen
                          Zhaohui Zhang
	Filename        : draft-ietf-bess-mvpn-expl-track-11.txt
	Pages           : 18
	Date            : 2018-10-04

Abstract:
   The MVPN specifications provide procedures to allow a multicast
   ingress node to invoke "explicit tracking" for a multicast flow or
   set of flows, thus learning the egress nodes for that flow or set of
   flows.  However, the specifications are not completely clear about
   how the explicit tracking procedures work in certain scenarios.  This
   document provides the necessary clarifications.  It also specifies a
   new, optimized explicit tracking procedure.  This new procedure
   allows an ingress node, by sending a single message, to request
   explicit tracking of each of a set of flows, where the set of flows
   is specified using a wildcard mechanism.  This document updates RFCs
   6514, 6625, and 7524.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-bess-mvpn-expl-track/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-bess-mvpn-expl-track-11
https://datatracker.ietf.org/doc/html/draft-ietf-bess-mvpn-expl-track-11

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-bess-mvpn-expl-track-11


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 Oct  4 09:30:56 2018
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From: Linda Dunbar <linda.dunbar@huawei.com>
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Thread-Topic: Last call comment to draft-ietf-bess-evpn-inter-subnet-forwarding-05
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--_000_4A95BA014132FF49AE685FAB4B9F17F66B14EDD0sjceml521mbschi_
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Ali, et al:

Sorry for the late comments. I remember reviewing/contributing to this draf=
t many years ago. Happy to see it is finally moving to IESG Last Call.

The draft describes the mechanism to allow TSs belonging to different subne=
ts attached to same PE to be communicated by the PE (instead hair pinned to=
 the L3GW). Very good optimization.

However, not every PE has the needed policies for any two subnet communicat=
ion (that is why the traffic was to be sent to L3GW). Therefore, the draft =
needs a section to describe how the PEs determine if it has the needed poli=
cies for specific inter subnets communication.
In addition, when subnets are scatted among many different PEs, it requires=
 the L3GW to maintain all the mappings. In Data center when there are many =
VMs or Containers, the number of mappings for L3GW to maintain is huge (it =
practically becomes host routing for tens of thousands of VMs or Containers=
). It doesn't scale well. Therefore, the mechanism should allow some PEs to=
 maintain some of the mappings, i.e. becoming a designated L3GW for some su=
bnets.

If you are willing to accept this comment, I can provide the text on "Inter=
-subnet communication Policy on PE".

Thank you.

Linda Dunbar




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<p class=3D"MsoNormal">Ali, et al: <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Sorry for the late comments. I remember reviewing/co=
ntributing to this draft many years ago. Happy to see it is finally moving =
to IESG Last Call.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The draft describes the mechanism to allow TSs belon=
ging to different subnets attached to same PE to be communicated by the PE =
(instead hair pinned to the L3GW). Very good optimization.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">However, not every PE has the needed policies for an=
y two subnet communication (that is why the traffic was to be sent to L3GW)=
. Therefore, the draft needs a section to describe how the PEs determine if=
 it has the needed policies for specific
 inter subnets communication.<o:p></o:p></p>
<p class=3D"MsoNormal">In addition, when subnets are scatted among many dif=
ferent PEs, it requires the L3GW to maintain all the mappings. In Data cent=
er when there are many VMs or Containers, the number of mappings for L3GW t=
o maintain is huge (it practically
 becomes host routing for tens of thousands of VMs or Containers). It doesn=
&#8217;t scale well. Therefore, the mechanism should allow some PEs to main=
tain some of the mappings, i.e. becoming a designated L3GW for some subnets=
.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">If you are willing to accept this comment, I can pro=
vide the text on &#8220;Inter-subnet communication Policy on PE&#8221;.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Thank you. <o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Linda Dunbar<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
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From: "Mrinmoy Ghosh (mrghosh)" <mrghosh@cisco.com>
To: Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com>, "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>, "bess@ietf.org" <bess@ietf.org>
CC: Jiang He <jiang.he@ericsson.com>, P Muthu Arul Mozhi <p.muthu.arul.mozhi@ericsson.com>
Thread-Topic: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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To: Eric Rosen <erosen@juniper.net>, "gen-art@ietf.org" <gen-art@ietf.org>
Cc: "draft-ietf-bess-mvpn-expl-track.all@ietf.org" <draft-ietf-bess-mvpn-expl-track.all@ietf.org>, "bess@ietf.org" <bess@ietf.org>
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From: Brian E Carpenter <brian.e.carpenter@gmail.com>
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Subject: Re: [bess] Genart last call review of draft-ietf-bess-mvpn-expl-track-10
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Hi Eric,

On 2018-10-05 04:15, Eric Rosen wrote:
>> Minor issues:
>> -------------
>>
>> As I understand it, if a network only partially supports the new
>> (LIR-pF) flag, it doesn't work properly. So we find at the end of
>> section 2:
>>
>> ...the ingress node can conclude
>>     that the egress node originating that Leaf A-D route does not supp=
ort
>>     the LIR-pF flag.
>>
>>     The software at the ingress node SHOULD detect this, and should ha=
ve
>>     a way of alerting the operator that the deployment is not properly=

>>     configured.
>>
>> I don't see why this is only a SHOULD, and I don't see why the operato=
r
>> alert is not a MUST too. Surely the operator always needs to be alerte=
d?
>=20
> Good point, I have changed this to:
>=20
>  =C2=A0=C2=A0 The software at the ingress node MUST detect this, and MU=
ST have a=20
> way of alerting the operator that the deployment is not properly config=
ured.

Thanks.
=20
>> I agree with the point raised in the Routing Area review
>> (be explicit about the updated sections of RFC 6514, 6625,
>> and 7524).
>=20
> The clarifications and extensions may affect the procedures for=20
> originating and receiving/processing S-PMSI A-D routes and Leaf A-D=20
> routes.=C2=A0 These procedures are discussed in many different places i=
n the=20
> updated drafts.=C2=A0=20

Fair enough. I suggest adding a version of those two sentences in the
Introduction. Otherwise you can bet on this point being raised by the
IESG anyway.

Regards
    Brian

> I don't believe there is any value in having the=20
> authors of mvpn-expl-track go through those drafts to try to make a lis=
t=20
> of all the places where S-PMSI A-D routes and/or Leaf A-D routes are=20
> discussed.=C2=A0 If we attempted to do so, we'd surely miss a few place=
s and=20
> thereby introduce bugs into the spec.=C2=A0 The information currently i=
n the=20
> document is sufficient to enable anyone who understands the updated=20
> references to figure out what needs to be done.





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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@ericsson.com" <jaikumar.somasundaram@ericsson.com>,  "bess@ietf.org" <bess@ietf.org>, "jiang.he@ericsson.com" <jiang.he@ericsson.com>, "p.muthu.arul.mozhi@ericsson.com" <p.muthu.arul.mozhi@ericsson.com>
Thread-Topic: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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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: Jiang He <jiang.he@ericsson.com>, P Muthu Arul Mozhi <p.muthu.arul.mozhi@ericsson.com>
Thread-Topic: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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From: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>
To: Anush Mohan <anush.iitm@gmail.com>
CC: "muthu.arul@gmail.com" <muthu.arul@gmail.com>, "jiang.he@ericsson.com" <jiang.he@ericsson.com>, "p.muthu.arul.mozhi@ericsson.com" <p.muthu.arul.mozhi@ericsson.com>, "bess@ietf.org" <bess@ietf.org>, "jaikumar.somasundaram@ericsson.com" <jaikumar.somasundaram@ericsson.com>
Thread-Topic: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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Date: Thu, 4 Oct 2018 16:53:03 +0000
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References: <067ED9A1-F8D0-4C53-97A0-3E6FA7E063EC@nokia.com> <VI1PR07MB4302D68B2828F10E49C834A486EA0@VI1PR07MB4302.eurprd07.prod.outlook.com> <D4979895-D9D9-434D-A247-62682E678853@nokia.com> <CAKz0y8zP+h+=tvEiiM=5MZxzdtk43_jOJ8BxtgENs5D-Orx98Q@mail.gmail.com> <19D6CCFE-183E-4BF7-A7D2-7D5F9DA96D7A@nokia.com> <CAKz0y8xzxNv2EBuCmUC2r5=tDozc1th41Ao0dbdVXcAbEQLJRw@mail.gmail.com> <9B51E983-4E46-4E7B-9F28-F161A6CB362F@nokia.com>
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From: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
Date: Fri, 5 Oct 2018 09:17:14 +0530
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To: jorge.rabadan@nokia.com
Cc: jaikumar.somasundaram@ericsson.com, bess@ietf.org, jiang.he@ericsson.com,  p.muthu.arul.mozhi@ericsson.com
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Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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Thanks, Jorge.

In EVPN single-active dual-homing or EVPN VPWS single-active multi-homing,
when other PEs realize that the DF is dead, they all need to re-run the DF
election for sure. However, traffic recovery need not wait until the DF
election gets over electing a new DF..it only requires the other PEs and
the backup to realize the primary/DF is dead and start forward. That's my
point..

Regards,
Muthu

On Fri, Oct 5, 2018 at 1:30 AM Rabadan, Jorge (Nokia - US/Mountain View) <
jorge.rabadan@nokia.com> wrote:

> Muthu,
>
>
>
>
>
> *From: *Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
> *Date: *Thursday, October 4, 2018 at 5:37 PM
> *To: *"Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.co=
m
> >
> *Cc: *"jaikumar.somasundaram@ericsson.com" <
> jaikumar.somasundaram@ericsson.com>, "bess@ietf.org" <bess@ietf.org>, "
> jiang.he@ericsson.com" <jiang.he@ericsson.com>, "
> p.muthu.arul.mozhi@ericsson.com" <p.muthu.arul.mozhi@ericsson.com>
> *Subject: *Re: [bess] EVPN MH: Backup node behavior in Primary Path
> Failure
>
>
>
> Thanks, Jorge. This is inline with my thinking. So, in single-active
> multihoming, once the primary is dead we don't need to wait for the DF
> election to happen for the backup (or some other PE in the ES) to become
> active and start forwarding traffic over the ES, instead it only requires
> the remote PEs and backup to realize that the primary is dead (thru' NH
> tracking / BFD) and start forwarding over the ES, right?
>
> [JORGE] When the other PEs in the ES realize the DF is dead, they need to
> remove the dead PE from the candidate list and run DF Election. You may
> optimize things if you only have two PEs in the ES (such as skip the time=
r)
> but if you have more than 2 PEs in the ES, there is really no concept of
> backup PE in RFC7432, but simply the other PEs are non-DF. However, the
> concept of backup PE in an ES with more than two PEs is specified in
> RFC8214, where all the PEs in the ES not only elect a DF but also a backu=
p
> DF, and signal this backup condition in the AD per-EVI routes. Note this =
is
> not there in RFC7432.
>
>
>
> Regards,
>
> Muthu
>
>
>
> On Thu, Oct 4, 2018 at 8:10 PM Rabadan, Jorge (Nokia - US/Mountain View) =
<
> jorge.rabadan@nokia.com> wrote:
>
> Muthu,
>
>
>
> About this:
>
>
>
> Suppose we have a full mesh of iBGP sessions b/w the PEs, then who would
> withdraw the routes if the primary PE / DF itself fails? Instead, the BGP
> session would timeout causing the primary PE's neighbors to flush out the
> A-D routes received from the primary PE, right? This can take several
> seconds, isn't it?
>
>
>
> No, not in the implementations I know of. Next Hop tracking will
> immediately detect that the PE is not in the network anymore and the rout=
es
> will be invalidated. You can also bootstrap the BGP sessions to BFD.
>
> But that has nothing to do with EVPN!.. it=E2=80=99s regular BGP.
>
>
>
> Thx
>
> Jorge
>
>
>
> *From: *Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
> *Date: *Thursday, October 4, 2018 at 1:14 PM
> *To: *"Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.co=
m
> >
> *Cc: *"jaikumar.somasundaram@ericsson.com" <
> jaikumar.somasundaram@ericsson.com>, "bess@ietf.org" <bess@ietf.org>, "
> jiang.he@ericsson.com" <jiang.he@ericsson.com>, "
> p.muthu.arul.mozhi@ericsson.com" <p.muthu.arul.mozhi@ericsson.com>
> *Subject: *Re: [bess] EVPN MH: Backup node behavior in Primary Path
> Failure
>
>
>
> Please see inline..
>
>
>
> On Thu, Oct 4, 2018 at 3:33 PM Rabadan, Jorge (Nokia - US/Mountain View) =
<
> jorge.rabadan@nokia.com> wrote:
>
> In-line.
>
>
>
> Thx
>
> Jorge
>
>
>
> *From: *Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com>
> *Date: *Thursday, October 4, 2018 at 11:28 AM
> *To: *"Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.co=
m>,
> "bess@ietf.org" <bess@ietf.org>
> *Cc: *Jiang He <jiang.he@ericsson.com>, P Muthu Arul Mozhi <
> p.muthu.arul.mozhi@ericsson.com>
> *Subject: *RE: [bess] EVPN MH: Backup node behavior in Primary Path
> Failure
>
>
>
> Thanks Jorge for the quick reply.
>
> Please find further question below.
>
>
>
> *From:* Rabadan, Jorge (Nokia - US/Mountain View) <jorge.rabadan@nokia.co=
m>
>
> *Sent:* Thursday, October 4, 2018 1:52 PM
> *To:* Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com>;
> bess@ietf.org
> *Cc:* Jiang He <jiang.he@ericsson.com>; P Muthu Arul Mozhi <
> p.muthu.arul.mozhi@ericsson.com>
> *Subject:* Re: [bess] EVPN MH: Backup node behavior in Primary Path
> Failure
>
>
>
> Hi,
>
>
>
> Questions:
>
> 1.       Will the node in backup mode forward the packet to CE?
>
> [JORGE] as soon as it becomes DF it can forward packets to the CE. The
> backup node will have to run DF election upon the ES route withdrawal fro=
m
> the primary. If AC-DF is enabled, it can also react to the withdrawal of =
AD
> routes from the primary PE.
>
> *[Jai] Does that mean if any packet comes to a node that is still in the
> backup mode will get dropped, before the new DF election is complete? Why
> cant this be used as FRR? Or what is the use case of having backup node(s=
)?*
>
> *[JORGE2] when the primary node fails, ES and AD routes are withdrawn. *
>
> Suppose we have a full mesh of iBGP sessions b/w the PEs, then who would
> withdraw the routes if the primary PE / DF itself fails? Instead, the BGP
> session would timeout causing the primary PE's neighbors to flush out the
> A-D routes received from the primary PE, right? This can take several
> seconds, isn't it?
>
>
>
> Regards,
>
> Muthu
>
> *The AD route withdrawal is an indication for remote nodes that they have
> to send traffic to the backup (for a given MAC) or to flush the MACs if
> there are more than 2 PEs in the ES. Around the same time or maybe earlie=
r,
> the ES route withdrawal will make the backup PE take over as DF. So the
> overall convergence time will depend on how/when those two things happen =
in
> time. Only the DF PE can forward traffic. A non-DF can never forward
> traffic or there will be risk of duplicate packets.*
>
>
>
> 2.       Will all the nodes in backup mode forward the packet before DF
> election?
>
> [JORGE] Only the new DF can forward.
>
>
>
> 3. If they forward, how is duplicate packets handled, in this case?
>
> [JORGE] see above.
>
>
>
> My two cents..
>
>
>
> Thanks.
>
> Jorge
>
>
>
>
>
>
>
> *From: *BESS <bess-bounces@ietf.org> on behalf of Jaikumar Somasundaram <
> jaikumar.somasundaram@ericsson.com>
> *Date: *Thursday, October 4, 2018 at 10:03 AM
> *To: *"bess@ietf.org" <bess@ietf.org>
> *Cc: *Jiang He <jiang.he@ericsson.com>, P Muthu Arul Mozhi <
> p.muthu.arul.mozhi@ericsson.com>
> *Subject: *[bess] EVPN MH: Backup node behavior in Primary Path Failure
>
>
>
> Hello Everyone,
>
>
>
> Sorry if it is a duplicate. I repost this query as I did not receive any
> response yet.
>
> (I was wondering if this mail already reached the group or not)
>
>
>
> I have a question on Primary PE encountering a failure in EVPN multihomin=
g
>
> in single active mode.
>
>
>
> RFC7432, section 14.1.1:
>
> <snip>
>
>    If there is more than one backup PE for a given ES, the remote PE
>
>    MUST use the primary PE's withdrawal of its set of Ethernet A-D per
>
>    ES routes as a trigger to start flooding traffic for the associated
>
>    MAC addresses (as long as flooding of unknown unicast packets is
>
>    administratively allowed), as it is not possible to select a single
>
>    backup PE.
>
> </snip>
>
>
>
> Questions:
>
> 1. Will the node in backup mode forward the packet to CE?
>
> 2. Will all the nodes in backup mode forward the packet before DF electio=
n?
>
> 3. If they forward, how is duplicate packets handled, in this case?
>
>
>
> Please help me anwere these questions.
>
>
>
> Thanks & Regards
>
> Jaikumar S
>
>
>
> _______________________________________________
> BESS mailing list
> BESS@ietf.org
> https://www.ietf.org/mailman/listinfo/bess
>
>

--0000000000005091cd05777321e6
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div class=3D"gmail_default" style=3D""><font face=3D"mono=
space, monospace">Thanks, Jorge.</font></div><div class=3D"gmail_default" s=
tyle=3D""><font face=3D"monospace, monospace"><br></font></div><div class=
=3D"gmail_default" style=3D""><font face=3D"monospace, monospace">In EVPN s=
ingle-active dual-homing or EVPN VPWS single-active multi-homing, when othe=
r PEs realize that the DF is dead, they all need to re-run the DF election =
for sure. However, traffic recovery need not wait until the DF election get=
s over electing a new DF..it only requires the other PEs and the backup to =
realize the primary/DF is dead and start forward. That&#39;s my point..</fo=
nt></div><div class=3D"gmail_default" style=3D""><font face=3D"monospace, m=
onospace"><br></font></div><div class=3D"gmail_default" style=3D""><font fa=
ce=3D"monospace, monospace">Regards,</font></div><div class=3D"gmail_defaul=
t" style=3D""><font face=3D"monospace, monospace">Muthu</font></div><div cl=
ass=3D"gmail_default" style=3D""><font face=3D"monospace, monospace"><br></=
font></div><div class=3D"gmail_quote"><div dir=3D"ltr">On Fri, Oct 5, 2018 =
at 1:30 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><b=
lockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px =
#ccc solid;padding-left:1ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"m_897134620352651982WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">Muthu,<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:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><b><span style=3D"font-=
size:12.0pt;color:black">From:
</span></b><span style=3D"font-size:12.0pt;color:black">Muthu Arul Mozhi Pe=
rumal &lt;<a href=3D"mailto:muthu.arul@gmail.com" target=3D"_blank">muthu.a=
rul@gmail.com</a>&gt;<br>
<b>Date: </b>Thursday, October 4, 2018 at 5:37 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>&quot;<a href=3D"mailto:jaikumar.somasundaram@ericsson.com" targ=
et=3D"_blank">jaikumar.somasundaram@ericsson.com</a>&quot; &lt;<a href=3D"m=
ailto:jaikumar.somasundaram@ericsson.com" target=3D"_blank">jaikumar.somasu=
ndaram@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" ta=
rget=3D"_blank">bess@ietf.org</a>&gt;, &quot;<a href=3D"mailto:jiang.he@eri=
csson.com" target=3D"_blank">jiang.he@ericsson.com</a>&quot; &lt;<a href=3D=
"mailto:jiang.he@ericsson.com" target=3D"_blank">jiang.he@ericsson.com</a>&=
gt;, &quot;<a href=3D"mailto:p.muthu.arul.mozhi@ericsson.com" target=3D"_bl=
ank">p.muthu.arul.mozhi@ericsson.com</a>&quot; &lt;<a href=3D"mailto:p.muth=
u.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@ericsson.co=
m</a>&gt;<br>
<b>Subject: </b>Re: [bess] EVPN MH: Backup node behavior in Primary Path Fa=
ilure<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><u></u>=C2=A0<u></u></p=
>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:12.0pt;font-family:&quot;Arial&quot;,sans-serif">Thanks, Jorge. This is i=
nline with my thinking. So, in single-active multihoming, once the primary =
is dead we don&#39;t need to wait for the DF election
 to happen for the backup (or some other PE in the ES) to become active and=
 start forwarding traffic over the ES, instead it only requires the remote =
PEs and backup to realize that the primary is dead (thru&#39; NH tracking /=
 BFD) and start forwarding over the
 ES, right?<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:Consolas=
">[JORGE] When the other PEs in the ES realize the DF is dead, they need to=
 remove the dead PE from the candidate list and run DF Election. You may op=
timize things if you only have two PEs
 in the ES (such as skip the timer) but if you have more than 2 PEs in the =
ES, there is really no concept of backup PE in RFC7432, but simply the othe=
r PEs are non-DF. However, the concept of backup PE in an ES with more than=
 two PEs is specified in RFC8214,
 where all the PEs in the ES not only elect a DF but also a backup DF, and =
signal this backup condition in the AD per-EVI routes. Note this is not the=
re in RFC7432.<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:12.0pt;font-family:&quot;Arial&quot;,sans-serif"><u></u>=C2=A0<u></u></sp=
an></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:12.0pt;font-family:&quot;Arial&quot;,sans-serif">Regards,<u></u><u></u></=
span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:12.0pt;font-family:&quot;Arial&quot;,sans-serif">Muthu<u></u><u></u></spa=
n></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:12.0pt;font-family:&quot;Arial&quot;,sans-serif"><u></u>=C2=A0<u></u></sp=
an></p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">On Thu, Oct 4, 2018 at =
8:10 PM Rabadan, Jorge (Nokia - US/Mountain View) &lt;<a href=3D"mailto:jor=
ge.rabadan@nokia.com" target=3D"_blank">jorge.rabadan@nokia.com</a>&gt; wro=
te:<u></u><u></u></p>
</div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">Muthu,</span><u></u><=
u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<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:36.0pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">About this:</span><u>=
</u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<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:72.0pt">
<span style=3D"font-size:12.0pt;font-family:&quot;Arial&quot;,sans-serif">S=
uppose we have a full mesh of iBGP sessions b/w the PEs, then who would wit=
hdraw the routes if the primary PE / DF itself fails? Instead, the BGP sess=
ion would timeout causing the primary PE&#39;s neighbors
 to flush out the A-D routes received from the primary PE, right? This can =
take several seconds, isn&#39;t it?</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span style=3D"font-size:12.0pt;font-family:&quot;Arial&quot;,sans-serif">=
=C2=A0</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">No, not in the implem=
entations I know of. Next Hop tracking will immediately detect that the PE =
is not in the network anymore and the routes will be invalidated. You can a=
lso bootstrap the BGP sessions to
 BFD. </span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">But that has nothing =
to do with EVPN!.. it=E2=80=99s regular BGP.</span><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">
<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:36.0pt">
<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:36.0pt">
<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:36.0pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">=C2=A0</span><u></u><=
u></u></p>
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<b><span style=3D"font-size:12.0pt;color:black">From: </span></b><span styl=
e=3D"font-size:12.0pt;color:black">Muthu Arul Mozhi Perumal &lt;<a href=3D"=
mailto:muthu.arul@gmail.com" target=3D"_blank">muthu.arul@gmail.com</a>&gt;=
<br>
<b>Date: </b>Thursday, October 4, 2018 at 1:14 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>&quot;<a href=3D"mailto:jaikumar.somasundaram@ericsson.com" targ=
et=3D"_blank">jaikumar.somasundaram@ericsson.com</a>&quot; &lt;<a href=3D"m=
ailto:jaikumar.somasundaram@ericsson.com" target=3D"_blank">jaikumar.somasu=
ndaram@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.org</a>&g=
t;, &quot;<a href=3D"mailto:jiang.he@ericsson.com" target=3D"_blank">jiang.=
he@ericsson.com</a>&quot; &lt;<a href=3D"mailto:jiang.he@ericsson.com" targ=
et=3D"_blank">jiang.he@ericsson.com</a>&gt;, &quot;<a href=3D"mailto:p.muth=
u.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@ericsson.co=
m</a>&quot;
 &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] EVPN MH: Backup node behavior in Primary Path Fa=
ilure</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
=C2=A0<u></u><u></u></p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-size:12.0pt;font-family:&quot;Arial&quot;,sans-serif">P=
lease see inline..</span><u></u><u></u></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
=C2=A0<u></u><u></u></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
On Thu, Oct 4, 2018 at 3:33 PM Rabadan, Jorge (Nokia - US/Mountain View) &l=
t;<a href=3D"mailto:jorge.rabadan@nokia.com" target=3D"_blank">jorge.rabada=
n@nokia.com</a>&gt; wrote:<u></u><u></u></p>
</div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">In-line.</span><u></u=
><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<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:72.0pt">
<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:72.0pt">
<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:72.0pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">=C2=A0</span><u></u><=
u></u></p>
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt">
<b><span style=3D"font-size:12.0pt;color:black">From: </span></b><span styl=
e=3D"font-size:12.0pt;color:black">Jaikumar Somasundaram &lt;<a href=3D"mai=
lto:jaikumar.somasundaram@ericsson.com" target=3D"_blank">jaikumar.somasund=
aram@ericsson.com</a>&gt;<br>
<b>Date: </b>Thursday, October 4, 2018 at 11:28 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;, &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">b=
ess@ietf.org</a>&gt;<br>
<b>Cc: </b>Jiang He &lt;<a href=3D"mailto:jiang.he@ericsson.com" target=3D"=
_blank">jiang.he@ericsson.com</a>&gt;, P Muthu Arul Mozhi &lt;<a href=3D"ma=
ilto:p.muthu.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@=
ericsson.com</a>&gt;<br>
<b>Subject: </b>RE: [bess] EVPN MH: Backup node behavior in Primary Path Fa=
ilure</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt">
=C2=A0<u></u><u></u></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt">
<span style=3D"color:#0070c0">Thanks Jorge for the quick reply.</span><u></=
u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt">
<span style=3D"color:#0070c0">Please find further question below.</span><u>=
</u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt">
=C2=A0<u></u><u></u></p>
<div>
<div style=3D"border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt">
<b>From:</b> Rabadan, Jorge (Nokia - US/Mountain View) &lt;<a href=3D"mailt=
o:jorge.rabadan@nokia.com" target=3D"_blank">jorge.rabadan@nokia.com</a>&gt=
;
<br>
<b>Sent:</b> Thursday, October 4, 2018 1:52 PM<br>
<b>To:</b> Jaikumar Somasundaram &lt;<a href=3D"mailto:jaikumar.somasundara=
m@ericsson.com" target=3D"_blank">jaikumar.somasundaram@ericsson.com</a>&gt=
;;
<a href=3D"mailto:bess@ietf.org" target=3D"_blank">bess@ietf.org</a><br>
<b>Cc:</b> Jiang He &lt;<a href=3D"mailto:jiang.he@ericsson.com" target=3D"=
_blank">jiang.he@ericsson.com</a>&gt;; P Muthu Arul Mozhi &lt;<a href=3D"ma=
ilto:p.muthu.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@=
ericsson.com</a>&gt;<br>
<b>Subject:</b> Re: [bess] EVPN MH: Backup node behavior in Primary Path Fa=
ilure<u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt">
=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt">
<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:108.0pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">=C2=A0</span><u></u><=
u></u></p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:144.0pt">
Questions:<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:162.0pt">
1.<span style=3D"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,se=
rif">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 </span>
Will the node in backup mode forward the packet to CE?<u></u><u></u></p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:108.0pt">
[JORGE] as soon as it becomes DF it can forward packets to the CE. The back=
up node will have to run DF election upon the ES route withdrawal from the =
primary. If AC-DF is enabled, it can also react to the withdrawal of AD rou=
tes from the primary PE.<u></u><u></u></p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:108.0pt">
<b><i>[Jai] Does that mean if any packet comes to a node that is still in t=
he backup mode will get dropped, before the new DF election is complete? Wh=
y cant this be used as FRR? Or what is the use case of having backup node(s=
)?</i></b><u></u><u></u></p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:72.0pt">
<b><span style=3D"font-size:10.5pt;font-family:Consolas">[JORGE2] when the =
primary node fails, ES and AD routes are withdrawn.
</span></b><u></u><u></u></p>
</div>
</div>
</blockquote>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-size:12.0pt;font-family:&quot;Arial&quot;,sans-serif">S=
uppose we have a full mesh of iBGP sessions b/w the PEs, then who would wit=
hdraw the routes if the primary PE / DF itself fails? Instead, the BGP sess=
ion would timeout causing the primary PE&#39;s neighbors
 to flush out the A-D routes received from the primary PE, right? This can =
take several seconds, isn&#39;t it?</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-size:12.0pt;font-family:&quot;Arial&quot;,sans-serif">=
=C2=A0</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-size:12.0pt;font-family:&quot;Arial&quot;,sans-serif">R=
egards,</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
<span style=3D"font-size:12.0pt;font-family:&quot;Arial&quot;,sans-serif">M=
uthu</span><u></u><u></u></p>
</div>
</div>
<blockquote style=3D"border:none;border-left:solid #cccccc 1.0pt;padding:0c=
m 0cm 0cm 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0cm;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:72.0pt">
<b><span style=3D"font-size:10.5pt;font-family:Consolas">The AD route withd=
rawal is an indication for remote nodes that they have to send traffic to t=
he backup (for a given MAC) or to flush the MACs if there are more than 2 P=
Es in the ES. Around the same time
 or maybe earlier, the ES route withdrawal will make the backup PE take ove=
r as DF. So the overall convergence time will depend on how/when those two =
things happen in time. Only the DF PE can forward traffic. A non-DF can nev=
er forward traffic or there will
 be risk of duplicate packets.</span></b><u></u><u></u></p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:108.0pt">
=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:162.0pt">
2.<span style=3D"font-size:7.0pt;font-family:&quot;Times New Roman&quot;,se=
rif">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 </span>
Will all the nodes in backup mode forward the packet before DF election?<u>=
</u><u></u></p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:108.0pt">
[JORGE] Only the new DF can forward.<u></u><u></u></p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:108.0pt">
=C2=A0<u></u><u></u></p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:144.0pt">
3. If they forward, how is duplicate packets handled, in this case?<u></u><=
u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">[JORGE] see above.</s=
pan><u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt">
<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:108.0pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">My two cents..</span>=
<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt">
<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:108.0pt">
<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:108.0pt">
<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:108.0pt">
<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:108.0pt">
<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:108.0pt">
<span style=3D"font-size:10.5pt;font-family:Consolas">=C2=A0</span><u></u><=
u></u></p>
<div style=3D"border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:144.0pt">
<b><span style=3D"font-size:12.0pt;color:black">From: </span></b><span styl=
e=3D"font-size:12.0pt;color:black">BESS &lt;<a href=3D"mailto:bess-bounces@=
ietf.org" target=3D"_blank">bess-bounces@ietf.org</a>&gt; on behalf of Jaik=
umar Somasundaram &lt;<a href=3D"mailto:jaikumar.somasundaram@ericsson.com"=
 target=3D"_blank">jaikumar.somasundaram@ericsson.com</a>&gt;<br>
<b>Date: </b>Thursday, October 4, 2018 at 10:03 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>Jiang He &lt;<a href=3D"mailto:jiang.he@ericsson.com" target=3D"=
_blank">jiang.he@ericsson.com</a>&gt;, P Muthu Arul Mozhi &lt;<a href=3D"ma=
ilto:p.muthu.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@=
ericsson.com</a>&gt;<br>
<b>Subject: </b>[bess] EVPN MH: Backup node behavior in Primary Path Failur=
e</span><u></u><u></u></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:144.0pt">
=C2=A0<u></u><u></u></p>
</div>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:144.0pt">
Hello Everyone,<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:144.0pt">
=C2=A0<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:144.0pt">
Sorry if it is a duplicate. I repost this query as I did not receive any re=
sponse yet.<u></u><u></u></p>
<p class=3D"MsoNormal" style=3D"margin-left:144.0pt">
(I was wondering if this mail already reached the group or not)<u></u><u></=
u></p>
<p class=3D"MsoNormal" style=3D"margin-left:144.0pt">
=C2=A0<u></u><u></u></p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:144.0pt">
I have a question on Primary PE encountering a failure in EVPN multihoming<=
u></u><u></u></p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:144.0pt">
in single active mode.<u></u><u></u></p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:144.0pt">
=C2=A0<u></u><u></u></p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:144.0pt">
RFC7432, section 14.1.1:<u></u><u></u></p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:144.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">&lt;snip&gt;</span><u><=
/u><u></u></p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:144.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">=C2=A0=C2=A0 If there i=
s more than one backup PE for a given ES, the remote PE</span><u></u><u></u=
></p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:144.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">=C2=A0=C2=A0 MUST use t=
he primary PE&#39;s withdrawal of its set of Ethernet A-D per</span><u></u>=
<u></u></p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:144.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">=C2=A0=C2=A0 ES routes =
as a trigger to start flooding traffic for the associated</span><u></u><u><=
/u></p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:144.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">=C2=A0=C2=A0 MAC addres=
ses (as long as flooding of unknown unicast packets is</span><u></u><u></u>=
</p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:144.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">=C2=A0=C2=A0 administra=
tively allowed), as it is not possible to select a single</span><u></u><u><=
/u></p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:144.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">=C2=A0=C2=A0 backup PE.=
</span><u></u><u></u></p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:144.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">&lt;/snip&gt;</span><u>=
</u><u></u></p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:144.0pt">
=C2=A0<u></u><u></u></p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:144.0pt">
Questions:<u></u><u></u></p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:144.0pt">
1. Will the node in backup mode forward the packet to CE?<u></u><u></u></p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:144.0pt">
2. Will all the nodes in backup mode forward the packet before DF election?=
<u></u><u></u></p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:144.0pt">
3. If they forward, how is duplicate packets handled, in this case?<u></u><=
u></u></p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:144.0pt">
=C2=A0<u></u><u></u></p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:144.0pt">
Please help me anwere these questions.<u></u><u></u></p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:144.0pt">
=C2=A0<u></u><u></u></p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:144.0pt">
Thanks &amp; Regards<u></u><u></u></p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:144.0pt">
Jaikumar S<u></u><u></u></p>
<p class=3D"m_897134620352651982m-409024311180145859m-2386179909272137706ms=
oplaintext" style=3D"margin-left:144.0pt">
=C2=A0<u></u><u></u></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">
_______________________________________________<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>

--0000000000005091cd05777321e6--


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Date: Fri, 5 Oct 2018 09:44:32 +0530
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Subject: [bess] Signaling Control Word in EVPN
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RFC 8214 (EVPN VPWS) introduces a new EVPN Layer 2 Attributes extended
community for signaling the L2 MTU and other control flags, including the
one to signal that the control word needs to be included when sending
packets to this PE. It further describes how MTU checking is to be
performed when signaled using this extended community.

RFC 7432 however is completely silent about it. Is the extended community
described in RFC 8214 expected to used in EVPN (VPLS) as well to signal
things like the usage of control word?

Regards,
Muthu

--000000000000e9e77d0577738279
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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-family:monospac=
e,monospace;font-size:small">RFC 8214 (EVPN VPWS) introduces a new EVPN Lay=
er 2 Attributes extended community for signaling the L2 MTU and other contr=
ol flags, including the one to signal that the control word needs to be inc=
luded when sending packets to this PE. It further describes how MTU checkin=
g is to be performed when signaled using this extended community.</div><div=
 class=3D"gmail_default" style=3D"font-family:monospace,monospace;font-size=
:small"><br></div><div class=3D"gmail_default" style=3D"font-family:monospa=
ce,monospace;font-size:small">RFC 7432 however is completely silent about i=
t. Is the extended community described in RFC 8214 expected to used in EVPN=
 (VPLS) as well to signal things like the usage of control word?</div><div =
class=3D"gmail_default" style=3D"font-family:monospace,monospace;font-size:=
small"><br></div><div class=3D"gmail_default" style=3D"font-family:monospac=
e,monospace;font-size:small">Regards,</div><div class=3D"gmail_default" sty=
le=3D"font-family:monospace,monospace;font-size:small">Muthu=C2=A0</div></d=
iv>

--000000000000e9e77d0577738279--


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From: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>
To: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
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Thread-Topic: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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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: Jiang He <jiang.he@ericsson.com>, P Muthu Arul Mozhi <p.muthu.arul.mozhi@ericsson.com>
Thread-Topic: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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From nobody Fri Oct  5 21:40:37 2018
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From: Christian Huitema <huitema@huitema.net>
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Cc: draft-ietf-bess-mvpn-expl-track.all@ietf.org, ietf@ietf.org, bess@ietf.org
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Subject: [bess] Secdir last call review of draft-ietf-bess-mvpn-expl-track-11
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Reviewer: Christian Huitema
Review result: Has Nits

I have reviewed this document as part of the security directorate's
ongoing effort to review all IETF documents being processed by the
IESG.  These comments were written primarily for the benefit of the
security area directors.  Document editors and WG chairs should treat
these comments just like any other last call comments.

I have reviewed version 11 of draft-ietf-bess-mvpn-expl-track. From a security
point of view this draft is almost ready, except for the small issue that no
mitigation is proposed for the one vulnerability discussed in the security
section.

Multicast VPN (MVPN) operates by setting a routing tree between the ingress
site and the egress sites. In MVPN, that tree is built by the network provider,
and includes multicast nodes inside the network as well as the customer facing
"provider edge" routers. Ingress nodes do not necessarily know how many egress
nodes have joined the multicast tree at a given time. The purpose of Explicit
Tracking is to provide that information.

Explicit tracking procedures are defined by RFC 6513, RFC 6514, and RFC 6625.
They rely on MVPN tunnel attributes to trigger the setup of Selective Provider
Multicast Service Interface Auto-Discovery routes. The current draft
complements these procedures to cover a number of cases not yet covered, in
particular when the multicast groups for which information is desired are
indentified by wild cards instead of the full combination of source and group
identifiers. This is done by defining an additional flag (LIR-pF) in the tunnel
attributes.

The security considerations list only one issue: that abuse of wild card
definitions in large networks could trigger a large amount of explicit tracking
traffic, which might affect the performance of the control plane. Otherwise,
this draft does not change the security properties of MVPN discussed in RFC
6513 and RFC 6514. That seems fair, but the draft then says that studying
mitigations for the potential abuse is out of scope, which leaves me a bit
puzzled. I can think of a variety of techniques to either spread the explicit
tracking traffic over time, rate limit it, or aggregate it in intermediate
nodes. Some of those techniques could probably be proposed as a basic
mitigation.


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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
CC: "bess@ietf.org" <bess@ietf.org>, Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>, Yechiel Rosengarten <Yechiel.Rosengarten@ecitele.com>, Ron Sdayoor <Ron.Sdayoor@ecitele.com>, Shell Nakash <Shell.Nakash@ecitele.com>, Rotem Cohen <Rotem.Cohen@ecitele.com>, Dmitry Valdman <Dmitry.Valdman@ecitele.com>
Thread-Topic: [bess] Signaling Control Word in EVPN
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Subject: [bess] FW:  Signaling Control Word in EVPN
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
CC: "bess@ietf.org" <bess@ietf.org>, Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>, Yechiel Rosengarten <Yechiel.Rosengarten@ecitele.com>, Ron Sdayoor <Ron.Sdayoor@ecitele.com>, Shell Nakash <Shell.Nakash@ecitele.com>, Rotem Cohen <Rotem.Cohen@ecitele.com>, Dmitry Valdman <Dmitry.Valdman@ecitele.com>
Thread-Topic: [bess] Signaling Control Word in EVPN
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Subject: Re: [bess] Signaling Control Word in EVPN
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From: "Andrew G. Malis" <agmalis@gmail.com>
Date: Mon, 8 Oct 2018 12:33:25 -0400
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To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Cc: muthu.arul@gmail.com, Shell.Nakash@ecitele.com,  Yechiel.Rosengarten@ecitele.com, Michael.Gorokhovsky@ecitele.com,  Dmitry.Valdman@ecitele.com, Ron.Sdayoor@ecitele.com, bess@ietf.org,  Rotem.Cohen@ecitele.com
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Subject: Re: [bess] Signaling Control Word in EVPN
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Sasha,

In the light of draft-ietf-pals-ethernet-cw (very soon to be published as
an RFC), we might want to take a second look at the recommendations in
7432. I think 8214 has it right, where it recommends the control word in
the absence of an entropy label to prevent ECMP reordering. 7432 does
recommend the control word be used for MP2P LSPs, but I would certainly
recommend it whenever Ethernet frames are being sent without an entropy
label, whether MP2P, P2P, or P2MP, unless it is known that ECMP is not in
use in the network. As you know, ECMP reordering of Ethernet frames isn't
just theoretical, it's actually happening in the field.

Cheers,
Andy


On Mon, Oct 8, 2018 at 11:00 AM Alexander Vainshtein <
Alexander.Vainshtein@ecitele.com> wrote:

> Muthu and all,
>
> Please note also that RFC 7432 explicitly states that the CW SHOULD NOT b=
e
> used in the EVPN encapsulation of Ethernet frames that are delivered acro=
ss
> P2P or P2MP LSPs.
>
>
>
> Regards,
>
> Sasha
>
>
>
> Office: +972-39266302
>
> Cell:      +972-549266302
>
> Email:   Alexander.Vainshtein@ecitele.com
>
>
>
> *From:* Alexander Vainshtein
> *Sent:* Sunday, October 7, 2018 5:28 PM
> *To:* Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
> *Cc:* bess@ietf.org; Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com=
>;
> Yechiel Rosengarten (Yechiel.Rosengarten@ecitele.com) <
> Yechiel.Rosengarten@ecitele.com>; Ron Sdayoor (Ron.Sdayoor@ecitele.com) <
> Ron.Sdayoor@ecitele.com>; Shell Nakash <Shell.Nakash@ecitele.com>; Rotem
> Cohen (Rotem.Cohen@ecitele.com) <Rotem.Cohen@ecitele.com>; Dmitry Valdman
> <Dmitry.Valdman@ecitele.com>
> *Subject:* FW: [bess] Signaling Control Word in EVPN
>
>
>
> Resending because the previous message is has gone to the BESS list
> moderator
>
>
>
> Regards,
>
> Sasha
>
>
>
> Office: +972-39266302
>
> Cell:      +972-549266302
>
> Email:   Alexander.Vainshtein@ecitele.com
>
>
>
> *From:* Alexander Vainshtein
> *Sent:* Sunday, October 7, 2018 5:25 PM
> *To:* 'Muthu Arul Mozhi Perumal' <muthu.arul@gmail.com>; '
> sboutros@vmware.com' <sboutros@vmware.com>; 'ssalam@cisco.com' <
> ssalam@cisco.com>; 'jdrake@juniper.net' <jdrake@juniper.net>; '
> sajassi@cisco.com' <sajassi@cisco.com>; 'jorge.rabadan@nokia.com' <
> jorge.rabadan@nokia.com>
> *Cc:* bess@ietf.org; Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com=
>;
> Yechiel Rosengarten (Yechiel.Rosengarten@ecitele.com) <
> Yechiel.Rosengarten@ecitele.com>; Ron Sdayoor (Ron.Sdayoor@ecitele.com) <
> Ron.Sdayoor@ecitele.com>; Shell Nakash <Shell.Nakash@ecitele.com>; Rotem
> Cohen (Rotem.Cohen@ecitele.com) <Rotem.Cohen@ecitele.com>; Dmitry Valdman
> <Dmitry.Valdman@ecitele.com>
> *Subject:* RE: [bess] Signaling Control Word in EVPN
>
>
>
> Muthu, authors of 8214, and all,
>
> I fully agree that RFC 7432 does not define any way to exchange
> information about usage or non-usage of the Control Word (CW) in the EVPN
> encapsulation of Ethernet frames via the EVPN Control Plane (CP). It only
> RECOMMDNDS its usage or non-usage in specific deployment scenarios.
>
>
>
> I also think that a generic (not limited to VPWS) EVPN-CP mechanism for
> exchanging information about usage (or non-usage) of CW must handle sever=
al
> issues that are not relevant for VPWS services:
>
>
>
> 1.      Usage or non-usage of CW in EVPN encapsulation of BUM packets:
>
> a.      If ingress replication is used as the P-tunneling technology,
> usage of CW can be requested by each egress MAC-VRF of a given EVI.
>
> b.      If P2MP MPLS LSPs are used as the P-tunneling technology, all
> egress MAC-VRFs of the given  EVI will receive BUM packets either with or
> without the CW =E2=80=93 the decision would be taken by the ingress MAC-V=
RF, and
> egress MAC-VRFs would have to cope with whatever they get
>
> c.       One possible way to address these  two scenarios could be by
> using the EVPN Layer 2 Extended Community with EVPN Inclusive Multicast
> Ethernet Tag Routes (Type 3 EVPN routes):
>
>                                                               i.      Sin=
ce
> RFRC 7432 explicitly states in Section 12.2 that in this case BUM traffic
> may experience reordering when sent over P2MP LSPs, by default the CW
> SHOULD NOT be included in EVPN encapsulation of BUM traffic (since its on=
ly
> purpose is to prevent reordering)
>
>                                                              ii.      In
> the case of ingress replication, the C flag in this extended community
> would represent a request to include the CW in the EVPN encapsulation of
> the copies of BUM frames sent to the egress MAC-VRF that has advertised
> this route. However, even this may be superfluous, and we may agree not t=
o
> use the CW in EVPN encapsulation of BUM traffic
>
> 2.      Usage or non-usage of CW in EVPN encapsulation of =E2=80=9Cknown =
unicast=E2=80=9D
> packets:
>
> a.      In the case of VPWS each MAC-VRF is attached to just one ES, so
> advertising usage or non-usage of the CW in per-EVI Ethernet A-D route
> makes sense
>
> b.      In the case of a generic MP2MP EVI, each MAC-VRF can be attached
> to multiple ES. In this case, implementations SHOULD advertise the same C
> flag in all per-EVI Ethernet A-D routes they advertise. Alternatively,
> implementations may use this extended community with per-EVI Ethernet A-D
> Route with MAX-ESI representing all attached Ethernet Segments
>
> 3.      In any case, all implementations MUST be able:
>
> a.      To send and receive BUM packets without the CW
>
> b.      To send =E2=80=9Cknown unicast=E2=80=9D traffic with the CW if so=
 requested.
>
>
>
> I am not sure I=E2=80=99ve covered all aspects of signaling usage or non-=
usage of
> the CW in generic EVPN services, but, IMHO,  the above-mentioned points
> must be addressed in any solution.
>
>
>
> My 2c,
>
> Sasha
>
>
>
> Office: +972-39266302
>
> Cell:      +972-549266302
>
> Email:   Alexander.Vainshtein@ecitele.com
>
>
>
> *From:* BESS [mailto:bess-bounces@ietf.org <bess-bounces@ietf.org>] *On
> Behalf Of *Muthu Arul Mozhi Perumal
> *Sent:* Friday, October 5, 2018 7:15 AM
> *To:* bess@ietf.org
> *Subject:* [bess] Signaling Control Word in EVPN
>
>
>
> RFC 8214 (EVPN VPWS) introduces a new EVPN Layer 2 Attributes extended
> community for signaling the L2 MTU and other control flags, including the
> one to signal that the control word needs to be included when sending
> packets to this PE. It further describes how MTU checking is to be
> performed when signaled using this extended community.
>
>
>
> RFC 7432 however is completely silent about it. Is the extended community
> described in RFC 8214 expected to be used in EVPN (VPLS) as well to signa=
l
> things like the usage of control word?
>
>
>
> Regards,
>
> Muthu
>
> _________________________________________________________________________=
__
>
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--000000000000d0b09e0577ba2e77
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr">Sasha,<div><br></div><div>In the light of=
 draft-ietf-pals-ethernet-cw (very soon to be published as an RFC), we migh=
t want to take a second look at the recommendations in 7432. I think 8214 h=
as it right, where it recommends the control word in the absence of an entr=
opy label to prevent ECMP reordering. 7432 does recommend the control word =
be used for MP2P LSPs, but I would certainly recommend it whenever Ethernet=
 frames are being sent without an entropy label, whether MP2P, P2P, or P2MP=
, unless it is known that ECMP is not in use in the network. As you know, E=
CMP reordering of Ethernet frames isn&#39;t just theoretical, it&#39;s actu=
ally happening in the field.</div><div><br></div><div>Cheers,</div><div>And=
y</div><div><br></div></div></div><br><div class=3D"gmail_quote"><div dir=
=3D"ltr">On Mon, Oct 8, 2018 at 11:00 AM Alexander Vainshtein &lt;<a href=
=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ecitele.c=
om</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"margi=
n:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">





<div lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"m_-3912765359139372396WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Muthu and all,<u></u><u></u></span></=
p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Please note also that RFC 7432 explic=
itly states that the CW SHOULD NOT be used in the EVPN encapsulation of Eth=
ernet frames that are delivered across P2P or
 P2MP LSPs.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Regards,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Sasha<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Office: +972-39266302<u></u><u></u></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Cell:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +=
972-549266302<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Email:=C2=A0=C2=A0 <a href=3D"mailto:=
Alexander.Vainshtein@ecitele.com" target=3D"_blank">Alexander.Vainshtein@ec=
itele.com</a><u></u><u></u></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<div>
<div style=3D"border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,sans-serif">From:</span></b><span style=3D"font-size:11.0pt;=
font-family:&quot;Calibri&quot;,sans-serif"> Alexander Vainshtein
<br>
<b>Sent:</b> Sunday, October 7, 2018 5:28 PM<br>
<b>To:</b> Muthu Arul Mozhi Perumal &lt;<a href=3D"mailto:muthu.arul@gmail.=
com" target=3D"_blank">muthu.arul@gmail.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org" target=3D"_blank">bess@ietf.org=
</a>; Michael Gorokhovsky &lt;<a href=3D"mailto:Michael.Gorokhovsky@ecitele=
.com" target=3D"_blank">Michael.Gorokhovsky@ecitele.com</a>&gt;; Yechiel Ro=
sengarten (<a href=3D"mailto:Yechiel.Rosengarten@ecitele.com" target=3D"_bl=
ank">Yechiel.Rosengarten@ecitele.com</a>) &lt;<a href=3D"mailto:Yechiel.Ros=
engarten@ecitele.com" target=3D"_blank">Yechiel.Rosengarten@ecitele.com</a>=
&gt;; Ron Sdayoor (<a href=3D"mailto:Ron.Sdayoor@ecitele.com" target=3D"_bl=
ank">Ron.Sdayoor@ecitele.com</a>) &lt;<a href=3D"mailto:Ron.Sdayoor@ecitele=
.com" target=3D"_blank">Ron.Sdayoor@ecitele.com</a>&gt;; Shell Nakash &lt;<=
a href=3D"mailto:Shell.Nakash@ecitele.com" target=3D"_blank">Shell.Nakash@e=
citele.com</a>&gt;;
 Rotem Cohen (<a href=3D"mailto:Rotem.Cohen@ecitele.com" target=3D"_blank">=
Rotem.Cohen@ecitele.com</a>) &lt;<a href=3D"mailto:Rotem.Cohen@ecitele.com"=
 target=3D"_blank">Rotem.Cohen@ecitele.com</a>&gt;; Dmitry Valdman &lt;<a h=
ref=3D"mailto:Dmitry.Valdman@ecitele.com" target=3D"_blank">Dmitry.Valdman@=
ecitele.com</a>&gt;<br>
<b>Subject:</b> FW: [bess] Signaling Control Word in EVPN<u></u><u></u></sp=
an></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Resending because the previous messag=
e is has gone to the BESS list moderator<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Regards,<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Sasha<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Office: +972-39266302<u></u><u></u></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Cell:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +=
972-549266302<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Email:=C2=A0=C2=A0
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com" target=3D"_blank">Alexa=
nder.Vainshtein@ecitele.com</a><u></u><u></u></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<div>
<div style=3D"border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,sans-serif">From:</span></b><span style=3D"font-size:11.0pt;=
font-family:&quot;Calibri&quot;,sans-serif"> Alexander Vainshtein
<br>
<b>Sent:</b> Sunday, October 7, 2018 5:25 PM<br>
<b>To:</b> &#39;Muthu Arul Mozhi Perumal&#39; &lt;<a href=3D"mailto:muthu.a=
rul@gmail.com" target=3D"_blank">muthu.arul@gmail.com</a>&gt;; &#39;<a href=
=3D"mailto:sboutros@vmware.com" target=3D"_blank">sboutros@vmware.com</a>&#=
39; &lt;<a href=3D"mailto:sboutros@vmware.com" target=3D"_blank">sboutros@v=
mware.com</a>&gt;; &#39;<a href=3D"mailto:ssalam@cisco.com" target=3D"_blan=
k">ssalam@cisco.com</a>&#39; &lt;<a href=3D"mailto:ssalam@cisco.com" target=
=3D"_blank">ssalam@cisco.com</a>&gt;;
 &#39;<a href=3D"mailto:jdrake@juniper.net" target=3D"_blank">jdrake@junipe=
r.net</a>&#39; &lt;<a href=3D"mailto:jdrake@juniper.net" target=3D"_blank">=
jdrake@juniper.net</a>&gt;; &#39;<a href=3D"mailto:sajassi@cisco.com" targe=
t=3D"_blank">sajassi@cisco.com</a>&#39; &lt;<a href=3D"mailto:sajassi@cisco=
.com" target=3D"_blank">sajassi@cisco.com</a>&gt;; &#39;<a href=3D"mailto:j=
orge.rabadan@nokia.com" target=3D"_blank">jorge.rabadan@nokia.com</a>&#39; =
&lt;<a href=3D"mailto:jorge.rabadan@nokia.com" target=3D"_blank">jorge.raba=
dan@nokia.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org" target=3D"_blank">bess@ietf.org=
</a>; Michael Gorokhovsky &lt;<a href=3D"mailto:Michael.Gorokhovsky@ecitele=
.com" target=3D"_blank">Michael.Gorokhovsky@ecitele.com</a>&gt;; Yechiel Ro=
sengarten (<a href=3D"mailto:Yechiel.Rosengarten@ecitele.com" target=3D"_bl=
ank">Yechiel.Rosengarten@ecitele.com</a>)
 &lt;<a href=3D"mailto:Yechiel.Rosengarten@ecitele.com" target=3D"_blank">Y=
echiel.Rosengarten@ecitele.com</a>&gt;; Ron Sdayoor (<a href=3D"mailto:Ron.=
Sdayoor@ecitele.com" target=3D"_blank">Ron.Sdayoor@ecitele.com</a>) &lt;<a =
href=3D"mailto:Ron.Sdayoor@ecitele.com" target=3D"_blank">Ron.Sdayoor@ecite=
le.com</a>&gt;; Shell Nakash
 &lt;<a href=3D"mailto:Shell.Nakash@ecitele.com" target=3D"_blank">Shell.Na=
kash@ecitele.com</a>&gt;; Rotem Cohen (<a href=3D"mailto:Rotem.Cohen@ecitel=
e.com" target=3D"_blank">Rotem.Cohen@ecitele.com</a>) &lt;<a href=3D"mailto=
:Rotem.Cohen@ecitele.com" target=3D"_blank">Rotem.Cohen@ecitele.com</a>&gt;=
; Dmitry Valdman &lt;<a href=3D"mailto:Dmitry.Valdman@ecitele.com" target=
=3D"_blank">Dmitry.Valdman@ecitele.com</a>&gt;<br>
<b>Subject:</b> RE: [bess] Signaling Control Word in EVPN<u></u><u></u></sp=
an></p>
</div>
</div>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Calibri&quot;,sans-=
serif;color:#1f497d">Muthu, authors of 8214, and all,<u></u><u></u></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Calibri&quot;,sans-=
serif;color:#1f497d">I fully agree that RFC 7432 does not define any way to=
 exchange information about usage or non-usage of the Control Word (CW) in =
the EVPN encapsulation of Ethernet frames via
 the EVPN Control Plane (CP). It only RECOMMDNDS its usage or non-usage in =
specific deployment scenarios.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Calibri&quot;,sans-=
serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Calibri&quot;,sans-=
serif;color:#1f497d">I also think that a generic (not limited to VPWS) EVPN=
-CP mechanism for exchanging information about usage (or non-usage) of CW m=
ust handle several issues that are not relevant
 for VPWS services:<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Calibri&quot;,sans-=
serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"m_-3912765359139372396MsoListParagraph"><u></u><span style=3D"f=
ont-family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><span>1.<span styl=
e=3D"font:7.0pt &quot;Times New Roman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span dir=3D"LTR"></span><span style=3D"font-fa=
mily:&quot;Calibri&quot;,sans-serif;color:#1f497d">Usage or non-usage of CW=
 in EVPN encapsulation of BUM packets:<u></u><u></u></span></p>
<p class=3D"m_-3912765359139372396MsoListParagraph" style=3D"margin-left:72=
.0pt">
<u></u><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:#1f4=
97d"><span>a.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span dir=3D"LTR"></span><span style=3D"font-fa=
mily:&quot;Calibri&quot;,sans-serif;color:#1f497d">If ingress replication i=
s used as the P-tunneling technology, usage of CW can be requested by each =
egress MAC-VRF of a given EVI.
<u></u><u></u></span></p>
<p class=3D"m_-3912765359139372396MsoListParagraph" style=3D"margin-left:72=
.0pt">
<u></u><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:#1f4=
97d"><span>b.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span dir=3D"LTR"></span><span style=3D"font-fa=
mily:&quot;Calibri&quot;,sans-serif;color:#1f497d">If P2MP MPLS LSPs are us=
ed as the P-tunneling technology, all egress MAC-VRFs of the given =C2=A0EV=
I will receive BUM packets either with or without
 the CW =E2=80=93 the decision would be taken by the ingress MAC-VRF, and e=
gress MAC-VRFs would have to cope with whatever they get<u></u><u></u></spa=
n></p>
<p class=3D"m_-3912765359139372396MsoListParagraph" style=3D"margin-left:72=
.0pt">
<u></u><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:#1f4=
97d"><span>c.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span dir=3D"LTR"></span><span style=3D"font-fa=
mily:&quot;Calibri&quot;,sans-serif;color:#1f497d">One possible way to addr=
ess these =C2=A0two scenarios could be by using the EVPN Layer 2 Extended C=
ommunity with EVPN Inclusive Multicast Ethernet
 Tag Routes (Type 3 EVPN routes):<u></u><u></u></span></p>
<p class=3D"m_-3912765359139372396MsoListParagraph" style=3D"margin-left:10=
8.0pt">
<u></u><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:#1f4=
97d"><span><span style=3D"font:7.0pt &quot;Times New Roman&quot;">=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span>i.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 </span></span></span><u></u><span dir=3D"LTR"></span>=
<span style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">Si=
nce RFRC 7432 explicitly states in Section 12.2 that in this case BUM traff=
ic may
 experience reordering when sent over P2MP LSPs, by default the CW SHOULD N=
OT be included in EVPN encapsulation of BUM traffic (since its only purpose=
 is to prevent reordering)<u></u><u></u></span></p>
<p class=3D"m_-3912765359139372396MsoListParagraph" style=3D"margin-left:10=
8.0pt">
<u></u><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:#1f4=
97d"><span><span style=3D"font:7.0pt &quot;Times New Roman&quot;">=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span>ii.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 </span></span></span><u></u><span dir=3D"LTR"></span>=
<span style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:#1f497d">In=
 the case of ingress replication, the C flag in this extended community wou=
ld represent
 a request to include the CW in the EVPN encapsulation of the copies of BUM=
 frames sent to the egress MAC-VRF that has advertised this route. However,=
 even this may be superfluous, and we may agree not to use the CW in EVPN e=
ncapsulation of BUM traffic<u></u><u></u></span></p>
<p class=3D"m_-3912765359139372396MsoListParagraph"><u></u><span style=3D"f=
ont-family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><span>2.<span styl=
e=3D"font:7.0pt &quot;Times New Roman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span dir=3D"LTR"></span><span style=3D"font-fa=
mily:&quot;Calibri&quot;,sans-serif;color:#1f497d">Usage or non-usage of CW=
 in EVPN encapsulation of =E2=80=9Cknown unicast=E2=80=9D packets:<u></u><u=
></u></span></p>
<p class=3D"m_-3912765359139372396MsoListParagraph" style=3D"margin-left:72=
.0pt">
<u></u><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:#1f4=
97d"><span>a.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span dir=3D"LTR"></span><span style=3D"font-fa=
mily:&quot;Calibri&quot;,sans-serif;color:#1f497d">In the case of VPWS each=
 MAC-VRF is attached to just one ES, so advertising usage or non-usage of t=
he CW in per-EVI Ethernet A-D route makes sense<u></u><u></u></span></p>
<p class=3D"m_-3912765359139372396MsoListParagraph" style=3D"margin-left:72=
.0pt">
<u></u><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:#1f4=
97d"><span>b.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span dir=3D"LTR"></span><span style=3D"font-fa=
mily:&quot;Calibri&quot;,sans-serif;color:#1f497d">In the case of a generic=
 MP2MP EVI, each MAC-VRF can be attached to multiple ES. In this case, impl=
ementations SHOULD advertise the same C flag
 in all per-EVI Ethernet A-D routes they advertise. Alternatively, implemen=
tations may use this extended community with per-EVI Ethernet A-D Route wit=
h MAX-ESI representing all attached Ethernet Segments<u></u><u></u></span><=
/p>
<p class=3D"m_-3912765359139372396MsoListParagraph"><u></u><span style=3D"f=
ont-family:&quot;Calibri&quot;,sans-serif;color:#1f497d"><span>3.<span styl=
e=3D"font:7.0pt &quot;Times New Roman&quot;">=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span dir=3D"LTR"></span><span style=3D"font-fa=
mily:&quot;Calibri&quot;,sans-serif;color:#1f497d">In any case, all impleme=
ntations MUST be able:<u></u><u></u></span></p>
<p class=3D"m_-3912765359139372396MsoListParagraph" style=3D"margin-left:72=
.0pt">
<u></u><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:#1f4=
97d"><span>a.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span dir=3D"LTR"></span><span style=3D"font-fa=
mily:&quot;Calibri&quot;,sans-serif;color:#1f497d">To send and receive BUM =
packets without the CW<u></u><u></u></span></p>
<p class=3D"m_-3912765359139372396MsoListParagraph" style=3D"margin-left:72=
.0pt">
<u></u><span style=3D"font-family:&quot;Calibri&quot;,sans-serif;color:#1f4=
97d"><span>b.<span style=3D"font:7.0pt &quot;Times New Roman&quot;">=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0
</span></span></span><u></u><span dir=3D"LTR"></span><span style=3D"font-fa=
mily:&quot;Calibri&quot;,sans-serif;color:#1f497d">To send =E2=80=9Cknown u=
nicast=E2=80=9D traffic with the CW if so requested.<u></u><u></u></span></=
p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Calibri&quot;,sans-=
serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Calibri&quot;,sans-=
serif;color:#1f497d">I am not sure I=E2=80=99ve covered all aspects of sign=
aling usage or non-usage of the CW in generic EVPN services, but, IMHO, =C2=
=A0the above-mentioned points must be addressed in any solution.<u></u><u><=
/u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Calibri&quot;,sans-=
serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">My 2c,
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Sasha<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Office: +972-39266302<u></u><u></u></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Cell:=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 +=
972-549266302<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d">Email:=C2=A0=C2=A0
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com" target=3D"_blank">Alexa=
nder.Vainshtein@ecitele.com</a><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Ca=
libri&quot;,sans-serif;color:#1f497d"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:&quot=
;Calibri&quot;,sans-serif">From:</span></b><span style=3D"font-size:11.0pt;=
font-family:&quot;Calibri&quot;,sans-serif"> BESS [<a href=3D"mailto:bess-b=
ounces@ietf.org" target=3D"_blank">mailto:bess-bounces@ietf.org</a>]
<b>On Behalf Of </b>Muthu Arul Mozhi Perumal<br>
<b>Sent:</b> Friday, October 5, 2018 7:15 AM<br>
<b>To:</b> <a href=3D"mailto:bess@ietf.org" target=3D"_blank">bess@ietf.org=
</a><br>
<b>Subject:</b> [bess] Signaling Control Word in EVPN<u></u><u></u></span><=
/p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;">=
RFC 8214 (EVPN VPWS) introduces a new EVPN Layer 2 Attributes extended comm=
unity for signaling the L2 MTU and other control flags, including the one t=
o signal that the control word needs to be included
 when sending packets to this PE. It further describes how MTU checking is =
to be performed when signaled using this extended community.<u></u><u></u><=
/span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;">=
<u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;">=
RFC 7432 however is completely silent about it. Is the extended community d=
escribed in RFC 8214 expected to be used in EVPN (VPLS) as well to signal t=
hings like the usage of control word?<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;">=
<u></u>=C2=A0<u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;">=
Regards,<u></u><u></u></span></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Courier New&quot;">=
Muthu=C2=A0<u></u><u></u></span></p>
</div>
</div>
</div>
<br clear=3D"both">
___________________________________________________________________________=
<br>
<br>
This e-mail message is intended for the recipient only and contains informa=
tion which is <br>
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have recei=
ved this <br>
transmission in error, please inform us by e-mail, phone or fax, and then d=
elete the original <br>
and all copies thereof.<br>
___________________________________________________________________________=
<br>
</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>

--000000000000d0b09e0577ba2e77--


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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "Andrew G. Malis" <agmalis@gmail.com>
CC: "muthu.arul@gmail.com" <muthu.arul@gmail.com>, Shell Nakash <Shell.Nakash@ecitele.com>, Yechiel Rosengarten <Yechiel.Rosengarten@ecitele.com>, Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>, Dmitry Valdman <Dmitry.Valdman@ecitele.com>, Ron Sdayoor <Ron.Sdayoor@ecitele.com>, "bess@ietf.org" <bess@ietf.org>, Rotem Cohen <Rotem.Cohen@ecitele.com>
Thread-Topic: [bess] Signaling Control Word in EVPN
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Subject: Re: [bess] Signaling Control Word in EVPN
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From: Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com>
To: "Mrinmoy Ghosh (mrghosh)" <mrghosh@cisco.com>, "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>, "bess@ietf.org" <bess@ietf.org>
CC: Jiang He <jiang.he@ericsson.com>, P Muthu Arul Mozhi <p.muthu.arul.mozhi@ericsson.com>
Thread-Topic: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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Date: Fri, 5 Oct 2018 04:59:15 +0000
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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: Jiang He <jiang.he@ericsson.com>, P Muthu Arul Mozhi <p.muthu.arul.mozhi@ericsson.com>
Thread-Topic: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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From: James Bensley <jwbensley@gmail.com>
Date: Tue, 9 Oct 2018 13:48:55 +0100
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To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Cc: "Andrew G. Malis" <agmalis@gmail.com>, muthu.arul@gmail.com, Shell.Nakash@ecitele.com,  Yechiel.Rosengarten@ecitele.com, Michael.Gorokhovsky@ecitele.com,  Dmitry.Valdman@ecitele.com, Ron.Sdayoor@ecitele.com, bess@ietf.org,  Rotem.Cohen@ecitele.com
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Subject: Re: [bess] Signaling Control Word in EVPN
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On Tue, 9 Oct 2018 at 11:29, Alexander Vainshtein
<Alexander.Vainshtein@ecitele.com> wrote:
> I fully agree that reordering due to lack of the CW happens, and that usa=
ge of the CW is the right way to eliminate that.

Hi Sasha,

If I may rudely interject here. You have to be careful with your
wording. The PWMCW doesn't eliminate reordering.

https://tools.ietf.org/html/draft-ietf-pals-ethernet-cw-07#section-4:

4.  Recommendation

   The ambiguity between an MPLS payload that is an Ethernet PW and one
   that is an IP packet is resolved when the Ethernet PW control word is
   used.  This document updates [RFC4448] to state that where both the
   ingress PE and the egress PE support the Ethernet pseudowire control
   word, then the CW MUST be used.

The CW doesn't fix the problem in every case, but it does fix it in most ca=
ses.

The only way to truly fix this problem is to use entropy labels. The
problem with the CW draft is that it only recommends entropy labels or
FAT labels when ECMP is required, not when it isn't require *but*
exists anyway within the packet switched core:

   Where the application of ECMP to an Ethernet PW traffic is required,
   and where both the ingress and the egress PEs support [RFC6790]
   (Entropy Label Indicator/Entropy Label (ELI/EL)) or both the ingress
   and the egress PEs support [RFC6391] (FAT PW), then either method may
   be used.

For this reason my personal opinion is that only EL should be
recommended by the EVPN draft. I don't think a solution that doesn't
completely fix the problem (PWMCW) should be recommend when we have
one that does fully fix the problem (El/ELI or ELC/RLD in SR).

> Or should we agree that consistent usage of the CW in the EVPN encapsulat=
ion has to be delegated to some network-wide management mechanism/LSO? For =
the reference, the latest (expired) version of the EVPN YANG data model doe=
s not include any attributes that indicate usage or non-usage of the CW in =
the encapsulation...

This is perhaps the more difficult question ^ what to recommend in the
case that EL isn't supported? You could recommend that all devices
should be configured to *not* hash on the VPN payload and only the
label stack, then there can be no mistaking what the VPN contents are
(Ethernet/IPv4/IPv6/other) but, some devices might not support that.
Alternatively, you could recommend that the CW is used only when EL
isn't available but, some devices might not support that. I'll leave
this up to you guys as you're the experts here, I just wanted to point
out the wording issue above regarding CW and EL and "fixing"
reordering.

Cheers,
James.


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From: "Andrew G. Malis" <agmalis@gmail.com>
Date: Tue, 9 Oct 2018 10:16:06 -0400
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Cc: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>, muthu.arul@gmail.com,  Shell.Nakash@ecitele.com, Yechiel.Rosengarten@ecitele.com,  Michael.Gorokhovsky@ecitele.com, Dmitry.Valdman@ecitele.com,  Ron.Sdayoor@ecitele.com, bess@ietf.org, Rotem.Cohen@ecitele.com
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Subject: Re: [bess] Signaling Control Word in EVPN
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James,

It's much harder to mandate use of EL than the CW for several reasons:
- CW implementation is much more common than EL implementation
- PWs and/or EVPN are rarely the only traffic in an MPLS traffic tunnel,
rather, they will be multiplexed with other MPLS-based applications that
are using the traffic tunnel to reach a common destination. Thus, by using
the CW, you can disable ECMP only for those MPLS packets that cannot
tolerate reordering.

That said, I'm also concerned that because of the existing text in 7432,
implementations may not be using the CW even for P2P EVPN.

And we still don't have a good answer for Muthu's original question. :-)

Cheers,
Andy


On Tue, Oct 9, 2018 at 8:49 AM James Bensley <jwbensley@gmail.com> wrote:

> On Tue, 9 Oct 2018 at 11:29, Alexander Vainshtein
> <Alexander.Vainshtein@ecitele.com> wrote:
> > I fully agree that reordering due to lack of the CW happens, and that
> usage of the CW is the right way to eliminate that.
>
> Hi Sasha,
>
> If I may rudely interject here. You have to be careful with your
> wording. The PWMCW doesn't eliminate reordering.
>
> https://tools.ietf.org/html/draft-ietf-pals-ethernet-cw-07#section-4:
>
> 4.  Recommendation
>
>    The ambiguity between an MPLS payload that is an Ethernet PW and one
>    that is an IP packet is resolved when the Ethernet PW control word is
>    used.  This document updates [RFC4448] to state that where both the
>    ingress PE and the egress PE support the Ethernet pseudowire control
>    word, then the CW MUST be used.
>
> The CW doesn't fix the problem in every case, but it does fix it in most
> cases.
>
> The only way to truly fix this problem is to use entropy labels. The
> problem with the CW draft is that it only recommends entropy labels or
> FAT labels when ECMP is required, not when it isn't require *but*
> exists anyway within the packet switched core:
>
>    Where the application of ECMP to an Ethernet PW traffic is required,
>    and where both the ingress and the egress PEs support [RFC6790]
>    (Entropy Label Indicator/Entropy Label (ELI/EL)) or both the ingress
>    and the egress PEs support [RFC6391] (FAT PW), then either method may
>    be used.
>
> For this reason my personal opinion is that only EL should be
> recommended by the EVPN draft. I don't think a solution that doesn't
> completely fix the problem (PWMCW) should be recommend when we have
> one that does fully fix the problem (El/ELI or ELC/RLD in SR).
>
> > Or should we agree that consistent usage of the CW in the EVPN
> encapsulation has to be delegated to some network-wide management
> mechanism/LSO? For the reference, the latest (expired) version of the EVPN
> YANG data model does not include any attributes that indicate usage or
> non-usage of the CW in the encapsulation...
>
> This is perhaps the more difficult question ^ what to recommend in the
> case that EL isn't supported? You could recommend that all devices
> should be configured to *not* hash on the VPN payload and only the
> label stack, then there can be no mistaking what the VPN contents are
> (Ethernet/IPv4/IPv6/other) but, some devices might not support that.
> Alternatively, you could recommend that the CW is used only when EL
> isn't available but, some devices might not support that. I'll leave
> this up to you guys as you're the experts here, I just wanted to point
> out the wording issue above regarding CW and EL and "fixing"
> reordering.
>
> Cheers,
> James.
>

--0000000000008be16f0577cc61c6
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">James,<div><br></div><div>It&#39;s much harder to mandate =
use of EL than the CW for several reasons:</div><div>- CW implementation is=
 much more common than EL implementation</div><div>- PWs and/or EVPN are ra=
rely the only traffic in an MPLS traffic tunnel, rather, they will be multi=
plexed with other MPLS-based applications that are using the traffic tunnel=
 to reach a common destination. Thus, by using the CW, you can disable ECMP=
 only for those MPLS packets that cannot tolerate reordering.</div><div><br=
></div><div>That said, I&#39;m also concerned that because of the existing =
text in 7432, implementations may not be using the CW even for P2P EVPN.<br=
></div><div><div><br></div><div>And we still don&#39;t have a good answer f=
or Muthu&#39;s original question. :-)</div><div><br></div><div>Cheers,</div=
><div>Andy</div><br class=3D"gmail-Apple-interchange-newline"></div></div><=
br><div class=3D"gmail_quote"><div dir=3D"ltr">On Tue, Oct 9, 2018 at 8:49 =
AM James Bensley &lt;<a href=3D"mailto:jwbensley@gmail.com">jwbensley@gmail=
.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"mar=
gin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">On Tue, 9 Oct 2=
018 at 11:29, Alexander Vainshtein<br>
&lt;<a href=3D"mailto:Alexander.Vainshtein@ecitele.com" target=3D"_blank">A=
lexander.Vainshtein@ecitele.com</a>&gt; wrote:<br>
&gt; I fully agree that reordering due to lack of the CW happens, and that =
usage of the CW is the right way to eliminate that.<br>
<br>
Hi Sasha,<br>
<br>
If I may rudely interject here. You have to be careful with your<br>
wording. The PWMCW doesn&#39;t eliminate reordering.<br>
<br>
<a href=3D"https://tools.ietf.org/html/draft-ietf-pals-ethernet-cw-07#secti=
on-4" rel=3D"noreferrer" target=3D"_blank">https://tools.ietf.org/html/draf=
t-ietf-pals-ethernet-cw-07#section-4</a>:<br>
<br>
4.=C2=A0 Recommendation<br>
<br>
=C2=A0 =C2=A0The ambiguity between an MPLS payload that is an Ethernet PW a=
nd one<br>
=C2=A0 =C2=A0that is an IP packet is resolved when the Ethernet PW control =
word is<br>
=C2=A0 =C2=A0used.=C2=A0 This document updates [RFC4448] to state that wher=
e both the<br>
=C2=A0 =C2=A0ingress PE and the egress PE support the Ethernet pseudowire c=
ontrol<br>
=C2=A0 =C2=A0word, then the CW MUST be used.<br>
<br>
The CW doesn&#39;t fix the problem in every case, but it does fix it in mos=
t cases.<br>
<br>
The only way to truly fix this problem is to use entropy labels. The<br>
problem with the CW draft is that it only recommends entropy labels or<br>
FAT labels when ECMP is required, not when it isn&#39;t require *but*<br>
exists anyway within the packet switched core:<br>
<br>
=C2=A0 =C2=A0Where the application of ECMP to an Ethernet PW traffic is req=
uired,<br>
=C2=A0 =C2=A0and where both the ingress and the egress PEs support [RFC6790=
]<br>
=C2=A0 =C2=A0(Entropy Label Indicator/Entropy Label (ELI/EL)) or both the i=
ngress<br>
=C2=A0 =C2=A0and the egress PEs support [RFC6391] (FAT PW), then either met=
hod may<br>
=C2=A0 =C2=A0be used.<br>
<br>
For this reason my personal opinion is that only EL should be<br>
recommended by the EVPN draft. I don&#39;t think a solution that doesn&#39;=
t<br>
completely fix the problem (PWMCW) should be recommend when we have<br>
one that does fully fix the problem (El/ELI or ELC/RLD in SR).<br>
<br>
&gt; Or should we agree that consistent usage of the CW in the EVPN encapsu=
lation has to be delegated to some network-wide management mechanism/LSO? F=
or the reference, the latest (expired) version of the EVPN YANG data model =
does not include any attributes that indicate usage or non-usage of the CW =
in the encapsulation...<br>
<br>
This is perhaps the more difficult question ^ what to recommend in the<br>
case that EL isn&#39;t supported? You could recommend that all devices<br>
should be configured to *not* hash on the VPN payload and only the<br>
label stack, then there can be no mistaking what the VPN contents are<br>
(Ethernet/IPv4/IPv6/other) but, some devices might not support that.<br>
Alternatively, you could recommend that the CW is used only when EL<br>
isn&#39;t available but, some devices might not support that. I&#39;ll leav=
e<br>
this up to you guys as you&#39;re the experts here, I just wanted to point<=
br>
out the wording issue above regarding CW and EL and &quot;fixing&quot;<br>
reordering.<br>
<br>
Cheers,<br>
James.<br>
</blockquote></div>

--0000000000008be16f0577cc61c6--


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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "Andrew G. Malis" <agmalis@gmail.com>, "jwbensley@gmail.com" <jwbensley@gmail.com>
CC: "muthu.arul@gmail.com" <muthu.arul@gmail.com>, Shell Nakash <Shell.Nakash@ecitele.com>, Yechiel Rosengarten <Yechiel.Rosengarten@ecitele.com>, Michael Gorokhovsky <Michael.Gorokhovsky@ecitele.com>, Dmitry Valdman <Dmitry.Valdman@ecitele.com>, Ron Sdayoor <Ron.Sdayoor@ecitele.com>, "bess@ietf.org" <bess@ietf.org>, Rotem Cohen <Rotem.Cohen@ecitele.com>
Thread-Topic: [bess] Signaling Control Word in EVPN
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From: James Bensley <jwbensley@gmail.com>
Date: Tue, 9 Oct 2018 15:34:52 +0100
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To: "Andrew G. Malis" <agmalis@gmail.com>
Cc: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>,  Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>, Shell.Nakash@ecitele.com,  Yechiel.Rosengarten@ecitele.com, Michael.Gorokhovsky@ecitele.com,  Dmitry.Valdman@ecitele.com, Ron.Sdayoor@ecitele.com, bess@ietf.org,  Rotem Cohen <Rotem.Cohen@ecitele.com>
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Subject: Re: [bess] Signaling Control Word in EVPN
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On Tue, 9 Oct 2018 at 15:16, Andrew G. Malis <agmalis@gmail.com> wrote:
>
> James,

Hi Andy,

> It's much harder to mandate use of EL than the CW for several reasons:

I didn't say it should be mandated, but recommended.

> - CW implementation is much more common than EL implementation
> - PWs and/or EVPN are rarely the only traffic in an MPLS traffic tunnel, =
rather, they will be multiplexed with other MPLS-based applications that ar=
e using the traffic tunnel to reach a common destination. Thus, by using th=
e CW, you can disable ECMP only for those MPLS packets that cannot tolerate=
 reordering.

The CW does not disable ECMP. Any LSR on the path between ingress and
egress LER is free to look beyond the MPLS label stack and
misinterpret the 0x00 0x00 at the start of a control-word as a valid
MAC that starts 00:00:XX:XX:XX:XX and try to hash on Ethernet headers
starting directly after the MPLS label stack, and not label stack + 4
bytes. This is my point. The PWMCW doesn't stop re-ording in all
cases, but it does in most. So yes, not all devices support EL, but CW
doesn't stop re-ordering in all cases, so?

> That said, I'm also concerned that because of the existing text in 7432, =
implementations may not be using the CW even for P2P EVPN.
>
> And we still don't have a good answer for Muthu's original question. :-)

Sorry my intention is not to send this thread off-topic.

Cheers,
James.


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From: "Andrew G. Malis" <agmalis@gmail.com>
Date: Tue, 9 Oct 2018 10:54:17 -0400
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To: jwbensley@gmail.com
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Subject: Re: [bess] Signaling Control Word in EVPN
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--00000000000024718c0577ccea54
Content-Type: text/plain; charset="UTF-8"

James,

Agreed. We touched on that in section 7 of draft-ietf-pals-ethernet-cw,
where we advised operators that enabling post-CW DPI for ECMP calculations
could cause misordering.

Cheers,
Andy


On Tue, Oct 9, 2018 at 10:35 AM James Bensley <jwbensley@gmail.com> wrote:

> On Tue, 9 Oct 2018 at 15:16, Andrew G. Malis <agmalis@gmail.com> wrote:
> >
> > James,
>
> Hi Andy,
>
> > It's much harder to mandate use of EL than the CW for several reasons:
>
> I didn't say it should be mandated, but recommended.
>
> > - CW implementation is much more common than EL implementation
> > - PWs and/or EVPN are rarely the only traffic in an MPLS traffic tunnel,
> rather, they will be multiplexed with other MPLS-based applications that
> are using the traffic tunnel to reach a common destination. Thus, by using
> the CW, you can disable ECMP only for those MPLS packets that cannot
> tolerate reordering.
>
> The CW does not disable ECMP. Any LSR on the path between ingress and
> egress LER is free to look beyond the MPLS label stack and
> misinterpret the 0x00 0x00 at the start of a control-word as a valid
> MAC that starts 00:00:XX:XX:XX:XX and try to hash on Ethernet headers
> starting directly after the MPLS label stack, and not label stack + 4
> bytes. This is my point. The PWMCW doesn't stop re-ording in all
> cases, but it does in most. So yes, not all devices support EL, but CW
> doesn't stop re-ordering in all cases, so?
>
> > That said, I'm also concerned that because of the existing text in 7432,
> implementations may not be using the CW even for P2P EVPN.
> >
> > And we still don't have a good answer for Muthu's original question. :-)
>
> Sorry my intention is not to send this thread off-topic.
>
> Cheers,
> James.
>

--00000000000024718c0577ccea54
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr">James,<div><br></div><di=
v>Agreed. We touched on that in section 7 of draft-ietf-pals-ethernet-cw, w=
here we advised operators that enabling post-CW DPI for ECMP calculations c=
ould cause misordering.</div><div><br></div><div>Cheers,</div><div>Andy</di=
v><div><br></div></div></div></div><br><div class=3D"gmail_quote"><div dir=
=3D"ltr">On Tue, Oct 9, 2018 at 10:35 AM James Bensley &lt;<a href=3D"mailt=
o:jwbensley@gmail.com">jwbensley@gmail.com</a>&gt; wrote:<br></div><blockqu=
ote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc s=
olid;padding-left:1ex">On Tue, 9 Oct 2018 at 15:16, Andrew G. Malis &lt;<a =
href=3D"mailto:agmalis@gmail.com" target=3D"_blank">agmalis@gmail.com</a>&g=
t; wrote:<br>
&gt;<br>
&gt; James,<br>
<br>
Hi Andy,<br>
<br>
&gt; It&#39;s much harder to mandate use of EL than the CW for several reas=
ons:<br>
<br>
I didn&#39;t say it should be mandated, but recommended.<br>
<br>
&gt; - CW implementation is much more common than EL implementation<br>
&gt; - PWs and/or EVPN are rarely the only traffic in an MPLS traffic tunne=
l, rather, they will be multiplexed with other MPLS-based applications that=
 are using the traffic tunnel to reach a common destination. Thus, by using=
 the CW, you can disable ECMP only for those MPLS packets that cannot toler=
ate reordering.<br>
<br>
The CW does not disable ECMP. Any LSR on the path between ingress and<br>
egress LER is free to look beyond the MPLS label stack and<br>
misinterpret the 0x00 0x00 at the start of a control-word as a valid<br>
MAC that starts 00:00:XX:XX:XX:XX and try to hash on Ethernet headers<br>
starting directly after the MPLS label stack, and not label stack + 4<br>
bytes. This is my point. The PWMCW doesn&#39;t stop re-ording in all<br>
cases, but it does in most. So yes, not all devices support EL, but CW<br>
doesn&#39;t stop re-ordering in all cases, so?<br>
<br>
&gt; That said, I&#39;m also concerned that because of the existing text in=
 7432, implementations may not be using the CW even for P2P EVPN.<br>
&gt;<br>
&gt; And we still don&#39;t have a good answer for Muthu&#39;s original que=
stion. :-)<br>
<br>
Sorry my intention is not to send this thread off-topic.<br>
<br>
Cheers,<br>
James.<br>
</blockquote></div>

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From: "Yutianpeng (Tim)" <yutianpeng@huawei.com>
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Thread-Topic: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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Subject: [bess] I-D Action: draft-ietf-bess-mvpn-expl-track-12.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           : Explicit Tracking with Wild Card Routes in Multicast VPN
        Authors         : Andrew Dolganow
                          Jayant Kotalwar
                          Eric C. Rosen
                          Zhaohui Zhang
	Filename        : draft-ietf-bess-mvpn-expl-track-12.txt
	Pages           : 18
	Date            : 2018-10-09

Abstract:
   The MVPN specifications provide procedures to allow a multicast
   ingress node to invoke "explicit tracking" for a multicast flow or
   set of flows, thus learning the egress nodes for that flow or set of
   flows.  However, the specifications are not completely clear about
   how the explicit tracking procedures work in certain scenarios.  This
   document provides the necessary clarifications.  It also specifies a
   new, optimized explicit tracking procedure.  This new procedure
   allows an ingress node, by sending a single message, to request
   explicit tracking of each of a set of flows, where the set of flows
   is specified using a wildcard mechanism.  This document updates RFCs
   6514, 6625, and 7524.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-bess-mvpn-expl-track/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-bess-mvpn-expl-track-12
https://datatracker.ietf.org/doc/html/draft-ietf-bess-mvpn-expl-track-12

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-bess-mvpn-expl-track-12


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

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


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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
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Subject: [bess] draft-ietf-bess-mvpn-msdp-sa-interoperation
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Hi,

The draft had some good discussions prior to its adoption and we believe we=
 have resolved issues/comments raised at that time.
A few months ago Hejia did a RtgDir Early review, and a -01 revision was po=
sted to address the comments (https://mailarchive.ietf.org/arch/msg/bess/sZ=
myDbMVznyH1vFxEAw2FIyNOHk).

This is a relatively simple and straightforward feature but important to si=
mplify practical deployments. There is at least one commercial implementati=
on already.
If you have further comments/suggestions, please bring them forward so that=
 we as a WG can actively discuss and progress the work.

Thanks!
Jeffrey


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From: "Bocci, Matthew (Nokia - GB)" <matthew.bocci@nokia.com>
To: "bess@ietf.org" <bess@ietf.org>
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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: Ashutosh Gupta <ashutoshgupta.ietf@gmail.com>
CC: Ali Sajassi <sajassi@cisco.com>, "bess@ietf.org" <bess@ietf.org>
Thread-Topic: [bess] Comments on draft-sajassi-bess-evpn-mvpn-seamless-interop
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/qWDwxi9H0CVDpnt3Efoj-shb_5U>
Subject: Re: [bess] Comments on draft-sajassi-bess-evpn-mvpn-seamless-interop
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From: "Bocci, Matthew (Nokia - GB)" <matthew.bocci@nokia.com>
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--_000_D7FA0E6452E44664B10F5330454EA5D6nokiacom_--


From nobody Thu Oct 11 22:10:36 2018
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From: Brian Carpenter <brian.e.carpenter@gmail.com>
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Subject: [bess] Genart telechat review of draft-ietf-bess-mvpn-expl-track-12
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Reviewer: Brian Carpenter
Review result: Ready

Gen-ART telechat review of draft-ietf-bess-mvpn-expl-track-12

I am the assigned Gen-ART reviewer for this draft. The General Area
Review Team (Gen-ART) reviews all IETF documents being processed
by the IESG for the IETF Chair. Please wait for direction from your
document shepherd or AD before posting a new version of the draft.

For more information, please see the FAQ at
<http://wiki.tools.ietf.org/area/gen/trac/wiki/GenArtfaq>.

Document: draft-ietf-bess-mvpn-expl-track-12.txt
Reviewer: Brian Carpenter
Review Date: 2018-10-12
IETF LC End Date: 2018-10-09
IESG Telechat date: 2018-10-25 

Summary: Ready
--------

Comments: 
---------
Thank you for handling my Last Call comments.


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From: Qin Wu <bill.wu@huawei.com>
To: "bess@ietf.org" <bess@ietf.org>
Thread-Topic: VPN service performance monitoring draft
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Date: Sat, 13 Oct 2018 02:06:07 +0000
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Subject: [bess] VPN service performance monitoring draft
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Hi, Folks:
We have proposed a new YANG data model for VPN Service Performance Monitori=
ng.
This model can establish the relationship between underlay network topo and=
 VPN service topo built on top of it
and provide VPN service performance information between any two point in th=
e VPN service topology.
https://tools.ietf.org/html/draft-www-bess-yang-vpn-service-pm-00

Your review and comments are welcome.

-Qin

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<h1><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Calibr=
i&quot;,&quot;sans-serif&quot;;font-weight:normal">Hi, Folks:<o:p></o:p></s=
pan></h1>
<h1><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Calibr=
i&quot;,&quot;sans-serif&quot;;font-weight:normal">We have proposed a new Y=
ANG data model for VPN Service Performance Monitoring.
<o:p></o:p></span></h1>
<h1><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Calibr=
i&quot;,&quot;sans-serif&quot;;font-weight:normal">This model can establish=
 the relationship between underlay network topo and VPN service topo built =
on top of it<o:p></o:p></span></h1>
<h1><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-family:&quot;Calibr=
i&quot;,&quot;sans-serif&quot;;font-weight:normal">and provide VPN service =
performance information between any two point in the VPN service topology.<=
o:p></o:p></span></h1>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"https://tools.ietf.o=
rg/html/draft-www-bess-yang-vpn-service-pm-00">https://tools.ietf.org/html/=
draft-www-bess-yang-vpn-service-pm-00</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Your review and comments are we=
lcome.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">-Qin<o:p></o:p></span></p>
</div>
</body>
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From: "Jakob Heitz (jheitz)" <jheitz@cisco.com>
To: BESS <bess@ietf.org>
Thread-Topic: Encoding a 20 bit label in a 24 bit field.
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Subject: [bess] Encoding a 20 bit label in a 24 bit field.
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From: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>
To: "Jakob Heitz (jheitz)" <jheitz@cisco.com>, BESS <bess@ietf.org>
Thread-Topic: [bess] Encoding a 20 bit label in a 24 bit field.
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Subject: Re: [bess] Encoding a 20 bit label in a 24 bit field.
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Date: Mon, 15 Oct 2018 16:55:15 -0700
From: Jeff Tantsura <jefftant.ietf@gmail.com>
To: "Jakob Heitz (jheitz)" <jheitz@cisco.com>, BESS <bess@ietf.org>,  "=?utf-8?Q?Rabadan=2C_Jorge_(Nokia_-_US/Mountain_View)?=" <jorge.rabadan@nokia.com>
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Subject: Re: [bess] Encoding a 20 bit label in a 24 bit field.
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+1

Cheers,
Jeff
On Oct 15, 2018, 4:41 PM -0700, Rabadan, Jorge (Nokia - US/Mountain View) <jorge.rabadan@nokia.com>, wrote:
> I personally agree that it is good to make this explicit (although many implementations already interpreted it this way).
> Thanks,
> Jorge
>
>
> -----Original Message-----
> From: BESS <bess-bounces@ietf.org> on behalf of "Jakob Heitz (jheitz)" <jheitz@cisco.com>
> Date: Monday, October 15, 2018 at 3:22 PM
> To: BESS <bess@ietf.org>
> Subject: [bess] Encoding a 20 bit label in a 24 bit field.
>
> We have proposed the following erratum for RFC 7432.
>
> Opinions?
>
> Regards,
> Jakob.
>
>
> -----Original Message-----
> From: RFC Errata System <rfc-editor@rfc-editor.org>
> Sent: Friday, October 12, 2018 12:37 PM
> To: Ali Sajassi (sajassi) <sajassi@cisco.com>; raggarwa_1@yahoo.com; nabil.n.bitar@verizon.com; aisaac71@bloomberg.net; uttaro@att.com; jdrake@juniper.net; wim.henderickx@alcatel-lucent.com; db3546@att.com; aretana.ietf@gmail.com; martin.vigoureux@nokia.com; Giles Heron (giheron) <giheron@cisco.com>; nabil.n.bitar@verizon.com
> Cc: Krishnamoorthy Arumugham (karumugh) <karumugh@cisco.com>; l2vpn@ietf.org; rfc-editor@rfc-editor.org
> Subject: [Technical Errata Reported] RFC7432 (5523)
>
> The following errata report has been submitted for RFC7432,
> "BGP MPLS-Based Ethernet VPN".
>
> --------------------------------------
> You may review the report below and at:
> http://www.rfc-editor.org/errata/eid5523
>
> --------------------------------------
> Type: Technical
> Reported by: Krishnamoorthy Arumugham <karumugh@cisco.com>
>
> Section: 7
>
> Original Text
> -------------
> Clarifications to following sub-sections:
> Section 7.1
> Section 7.2
> Section 7.5
>
>
> Corrected Text
> --------------
> Section 7.1:
> Add below text to the section 7.1 regarding the encoding
> of MPLS label:
>
> "The value of the 20-bit MPLS label is encoded in the
> high-order 20 bits of the 3 bytes MPLS Label field."
>
> Section 7.2:
> Add below text to the section 7.2 regarding the encoding
> of both the MPLS label fields:
>
> "The value of the 20-bit MPLS label is encoded in the
> high-order 20 bits of the 3 bytes MPLS Label field for
> both MPLS Label1 and MPLS Label2."
>
> Section 7.5:
> Add below text to the section 7.5 regarding the encoding
> of ESI Label fields:
>
> "The value of the 20-bit MPLS label is encoded in the
> high-order 20 bits of the ESI Label field."
>
>
> Notes
> -----
> MPLS label is a 20-bit value and is stored in a 3 bytes field in a packet. The 20-bit MPLS label value is generally stored in higher order 20 bits of the 3 byte label field. The exact encoding to be followed for storing MPLS label values are not explicitly mentioned in the RFC 7432 under section 7.1, 7.2 and 7.5 for different types of EVPN routes. This lead to ambiguity in different implementations. Hence a clarification is required.
>
> Instructions:
> -------------
> This erratum is currently posted as "Reported". If necessary, please
> use "Reply All" to discuss whether it should be verified or
> rejected. When a decision is reached, the verifying party
> can log in to change the status and edit the report, if necessary.
>
> --------------------------------------
> RFC7432 (draft-ietf-l2vpn-evpn-11)
> --------------------------------------
> Title : BGP MPLS-Based Ethernet VPN
> Publication Date : February 2015
> Author(s) : A. Sajassi, Ed., R. Aggarwal, N. Bitar, A. Isaac, J. Uttaro, J. Drake, W. Henderickx
> Category : PROPOSED STANDARD
> Source : Layer 2 Virtual Private Networks
> Area : Routing
> Stream : IETF
> Verifying Party : IESG
>
> _______________________________________________
> 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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<body>
<div name=3D=22messageBodySection=22 style=3D=22font-size: 14px; font-fam=
ily: -apple-system, BlinkMacSystem=46ont, sans-serif;=22>+1</div>
<div name=3D=22messageSignatureSection=22 style=3D=22font-size: 14px; fon=
t-family: -apple-system, BlinkMacSystem=46ont, sans-serif;=22><br />
Cheers,
<div>Jeff</div>
</div>
<div name=3D=22messageReplySection=22 style=3D=22font-size: 14px; font-fa=
mily: -apple-system, BlinkMacSystem=46ont, sans-serif;=22>On Oct 15, 2018=
, 4:41 PM -0700, Rabadan, Jorge (Nokia - US/Mountain View) &lt;jorge.raba=
dan=40nokia.com&gt;, wrote:<br />
<blockquote type=3D=22cite=22 style=3D=22margin: 5px 5px; padding-left: 1=
0px; border-left: thin solid =231abc9c;=22>I personally agree that it is =
good to make this explicit (although many implementations already interpr=
eted it this way).<br />
Thanks,<br />
Jorge<br />
<br />
<br />
=EF=BB=BF-----Original Message-----<br />
=46rom: BESS &lt;bess-bounces=40ietf.org&gt; on behalf of =22Jakob Heitz =
(jheitz)=22 &lt;jheitz=40cisco.com&gt;<br />
Date: Monday, October 15, 2018 at 3:22 PM<br />
To: BESS &lt;bess=40ietf.org&gt;<br />
Subject: =5Bbess=5D Encoding a 20 bit label in a 24 bit field.<br />
<br />
We have proposed the following erratum for R=46C 7432.<br />
<br />
Opinions=3F<br />
<br />
Regards,<br />
Jakob.<br />
<br />
<br />
-----Original Message-----<br />
=46rom: R=46C Errata System &lt;rfc-editor=40rfc-editor.org&gt;<br />
Sent: =46riday, October 12, 2018 12:37 PM<br />
To: Ali Sajassi (sajassi) &lt;sajassi=40cisco.com&gt;; raggarwa=5F1=40yah=
oo.com; nabil.n.bitar=40verizon.com; aisaac71=40bloomberg.net; uttaro=40a=
tt.com; jdrake=40juniper.net; wim.henderickx=40alcatel-lucent.com; db3546=
=40att.com; aretana.ietf=40gmail.com; martin.vigoureux=40nokia.com; Giles=
 Heron (giheron) &lt;giheron=40cisco.com&gt;; nabil.n.bitar=40verizon.com=
<br />
Cc: Krishnamoorthy Arumugham (karumugh) &lt;karumugh=40cisco.com&gt;; l2v=
pn=40ietf.org; rfc-editor=40rfc-editor.org<br />
Subject: =5BTechnical Errata Reported=5D R=46C7432 (5523)<br />
<br />
The following errata report has been submitted for R=46C7432,<br />
=22BGP MPLS-Based Ethernet VPN=22.<br />
<br />
--------------------------------------<br />
You may review the report below and at:<br />
http://www.rfc-editor.org/errata/eid5523<br />
<br />
--------------------------------------<br />
Type: Technical<br />
Reported by: Krishnamoorthy Arumugham &lt;karumugh=40cisco.com&gt;<br />
<br />
Section: 7<br />
<br />
Original Text<br />
-------------<br />
Clarifications to following sub-sections:<br />
Section 7.1<br />
Section 7.2<br />
Section 7.5<br />
<br />
<br />
Corrected Text<br />
--------------<br />
Section 7.1:<br />
Add below text to the section 7.1 regarding the encoding<br />
of MPLS label:<br />
<br />
=22The value of the 20-bit MPLS label is encoded in the<br />
high-order 20 bits of the 3 bytes MPLS Label field.=22<br />
<br />
Section 7.2:<br />
Add below text to the section 7.2 regarding the encoding<br />
of both the MPLS label fields:<br />
<br />
=22The value of the 20-bit MPLS label is encoded in the<br />
high-order 20 bits of the 3 bytes MPLS Label field for<br />
both MPLS Label1 and MPLS Label2.=22<br />
<br />
Section 7.5:<br />
Add below text to the section 7.5 regarding the encoding<br />
of ESI Label fields:<br />
<br />
=22The value of the 20-bit MPLS label is encoded in the<br />
high-order 20 bits of the ESI Label field.=22<br />
<br />
<br />
Notes<br />
-----<br />
MPLS label is a 20-bit value and is stored in a 3 bytes field in a packet=
. The 20-bit MPLS label value is generally stored in higher order 20 bits=
 of the 3 byte label field. The exact encoding to be followed for storing=
 MPLS label values are not explicitly mentioned in the R=46C 7432 under s=
ection 7.1, 7.2 and 7.5 for different types of EVPN routes. This lead to =
ambiguity in different implementations. Hence a clarification is required=
.<br />
<br />
Instructions:<br />
-------------<br />
This erratum is currently posted as =22Reported=22. If necessary, please<=
br />
use =22Reply All=22 to discuss whether it should be verified or<br />
rejected. When a decision is reached, the verifying party<br />
can log in to change the status and edit the report, if necessary.<br />
<br />
--------------------------------------<br />
R=46C7432 (draft-ietf-l2vpn-evpn-11)<br />
--------------------------------------<br />
Title : BGP MPLS-Based Ethernet VPN<br />
Publication Date : =46ebruary 2015<br />
Author(s) : A. Sajassi, Ed., R. Aggarwal, N. Bitar, A. Isaac, J. Uttaro, =
J. Drake, W. Henderickx<br />
Category : PROPOSED STANDARD<br />
Source : Layer 2 Virtual Private Networks<br />
Area : Routing<br />
Stream : IET=46<br />
Verifying Party : IESG<br />
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From nobody Mon Oct 15 18:02:09 2018
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From: Zhuangshunwan <zhuangshunwan@huawei.com>
To: "Jakob Heitz (jheitz)" <jheitz@cisco.com>, BESS <bess@ietf.org>
Thread-Topic: Encoding a 20 bit label in a 24 bit field.
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Date: Tue, 16 Oct 2018 01:01:50 +0000
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Subject: Re: [bess] Encoding a 20 bit label in a 24 bit field.
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It is good to make this explicit. This ambiguity has led to some unnecessar=
y interworking problems.

Should we also need to explicitly define the "bottom of stack" bit in the l=
ow-order bit of the 3-octet label field?

Thanks,
Shunwan

-----Original Message-----
From: BESS [mailto:bess-bounces@ietf.org] On Behalf Of Jakob Heitz (jheitz)
Sent: Tuesday, October 16, 2018 4:21 AM
To: BESS <bess@ietf.org>
Subject: [bess] Encoding a 20 bit label in a 24 bit field.

We have proposed the following erratum for RFC 7432.

Opinions?

Regards,
Jakob.


-----Original Message-----
From: RFC Errata System <rfc-editor@rfc-editor.org>
Sent: Friday, October 12, 2018 12:37 PM
To: Ali Sajassi (sajassi) <sajassi@cisco.com>; raggarwa_1@yahoo.com; nabil.=
n.bitar@verizon.com; aisaac71@bloomberg.net; uttaro@att.com; jdrake@juniper=
.net; wim.henderickx@alcatel-lucent.com; db3546@att.com; aretana.ietf@gmail=
.com; martin.vigoureux@nokia.com; Giles Heron (giheron) <giheron@cisco.com>=
; nabil.n.bitar@verizon.com
Cc: Krishnamoorthy Arumugham (karumugh) <karumugh@cisco.com>; l2vpn@ietf.or=
g; rfc-editor@rfc-editor.org
Subject: [Technical Errata Reported] RFC7432 (5523)

The following errata report has been submitted for RFC7432, "BGP MPLS-Based=
 Ethernet VPN".

--------------------------------------
You may review the report below and at:
http://www.rfc-editor.org/errata/eid5523

--------------------------------------
Type: Technical
Reported by: Krishnamoorthy Arumugham <karumugh@cisco.com>

Section: 7

Original Text
-------------
Clarifications to following sub-sections:
Section 7.1
Section 7.2
Section 7.5


Corrected Text
--------------
Section 7.1:
Add below text to the section 7.1 regarding the encoding of MPLS label:

"The value of the 20-bit MPLS label is encoded in the high-order 20 bits of=
 the 3 bytes MPLS Label field."

Section 7.2:
Add below text to the section 7.2 regarding the encoding of both the MPLS l=
abel fields:

"The value of the 20-bit MPLS label is encoded in the high-order 20 bits of=
 the 3 bytes MPLS Label field for both MPLS Label1 and MPLS Label2."

Section 7.5:
Add below text to the section 7.5 regarding the encoding of ESI Label field=
s:

"The value of the 20-bit MPLS label is encoded in the high-order 20 bits of=
 the ESI Label field."


Notes
-----
MPLS label is a 20-bit value and is stored in a 3 bytes field in a packet. =
The 20-bit MPLS label value is generally stored in higher order 20 bits of =
the 3 byte label field. The exact encoding to be followed for storing MPLS =
label values are not explicitly mentioned in the RFC 7432 under section 7.1=
, 7.2 and 7.5 for different types of EVPN routes. This lead to ambiguity in=
 different implementations. Hence a clarification is required.

Instructions:
-------------
This erratum is currently posted as "Reported". If necessary, please
use "Reply All" to discuss whether it should be verified or
rejected. When a decision is reached, the verifying party =20
can log in to change the status and edit the report, if necessary.=20

--------------------------------------
RFC7432 (draft-ietf-l2vpn-evpn-11)
--------------------------------------
Title               : BGP MPLS-Based Ethernet VPN
Publication Date    : February 2015
Author(s)           : A. Sajassi, Ed., R. Aggarwal, N. Bitar, A. Isaac, J. =
Uttaro, J. Drake, W. Henderickx
Category            : PROPOSED STANDARD
Source              : Layer 2 Virtual Private Networks
Area                : Routing
Stream              : IETF
Verifying Party     : IESG

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


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From: "Jakob Heitz (jheitz)" <jheitz@cisco.com>
To: Zhuangshunwan <zhuangshunwan@huawei.com>, BESS <bess@ietf.org>
Thread-Topic: Encoding a 20 bit label in a 24 bit field.
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References: <3bca2ecfacc3489b92f451e34a99d20f@XCH-ALN-014.cisco.com> <19AB2A007F56DB4E8257F949A2FB9858DC48BE2E@NKGEML515-MBX.china.huawei.com>
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Subject: Re: [bess] Encoding a 20 bit label in a 24 bit field.
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How about:
The lower order 4 bits SHOULD be sent as 0 and ignored on receipt.

Regards,
Jakob.


-----Original Message-----
From: Zhuangshunwan <zhuangshunwan@huawei.com>=20
Sent: Monday, October 15, 2018 6:02 PM
To: Jakob Heitz (jheitz) <jheitz@cisco.com>; BESS <bess@ietf.org>
Subject: RE: Encoding a 20 bit label in a 24 bit field.

It is good to make this explicit. This ambiguity has led to some unnecessar=
y interworking problems.

Should we also need to explicitly define the "bottom of stack" bit in the l=
ow-order bit of the 3-octet label field?

Thanks,
Shunwan

-----Original Message-----
From: BESS [mailto:bess-bounces@ietf.org] On Behalf Of Jakob Heitz (jheitz)
Sent: Tuesday, October 16, 2018 4:21 AM
To: BESS <bess@ietf.org>
Subject: [bess] Encoding a 20 bit label in a 24 bit field.

We have proposed the following erratum for RFC 7432.

Opinions?

Regards,
Jakob.


-----Original Message-----
From: RFC Errata System <rfc-editor@rfc-editor.org>
Sent: Friday, October 12, 2018 12:37 PM
To: Ali Sajassi (sajassi) <sajassi@cisco.com>; raggarwa_1@yahoo.com; nabil.=
n.bitar@verizon.com; aisaac71@bloomberg.net; uttaro@att.com; jdrake@juniper=
.net; wim.henderickx@alcatel-lucent.com; db3546@att.com; aretana.ietf@gmail=
.com; martin.vigoureux@nokia.com; Giles Heron (giheron) <giheron@cisco.com>=
; nabil.n.bitar@verizon.com
Cc: Krishnamoorthy Arumugham (karumugh) <karumugh@cisco.com>; l2vpn@ietf.or=
g; rfc-editor@rfc-editor.org
Subject: [Technical Errata Reported] RFC7432 (5523)

The following errata report has been submitted for RFC7432, "BGP MPLS-Based=
 Ethernet VPN".

--------------------------------------
You may review the report below and at:
http://www.rfc-editor.org/errata/eid5523

--------------------------------------
Type: Technical
Reported by: Krishnamoorthy Arumugham <karumugh@cisco.com>

Section: 7

Original Text
-------------
Clarifications to following sub-sections:
Section 7.1
Section 7.2
Section 7.5


Corrected Text
--------------
Section 7.1:
Add below text to the section 7.1 regarding the encoding of MPLS label:

"The value of the 20-bit MPLS label is encoded in the high-order 20 bits of=
 the 3 bytes MPLS Label field."

Section 7.2:
Add below text to the section 7.2 regarding the encoding of both the MPLS l=
abel fields:

"The value of the 20-bit MPLS label is encoded in the high-order 20 bits of=
 the 3 bytes MPLS Label field for both MPLS Label1 and MPLS Label2."

Section 7.5:
Add below text to the section 7.5 regarding the encoding of ESI Label field=
s:

"The value of the 20-bit MPLS label is encoded in the high-order 20 bits of=
 the ESI Label field."


Notes
-----
MPLS label is a 20-bit value and is stored in a 3 bytes field in a packet. =
The 20-bit MPLS label value is generally stored in higher order 20 bits of =
the 3 byte label field. The exact encoding to be followed for storing MPLS =
label values are not explicitly mentioned in the RFC 7432 under section 7.1=
, 7.2 and 7.5 for different types of EVPN routes. This lead to ambiguity in=
 different implementations. Hence a clarification is required.

Instructions:
-------------
This erratum is currently posted as "Reported". If necessary, please
use "Reply All" to discuss whether it should be verified or
rejected. When a decision is reached, the verifying party =20
can log in to change the status and edit the report, if necessary.=20

--------------------------------------
RFC7432 (draft-ietf-l2vpn-evpn-11)
--------------------------------------
Title               : BGP MPLS-Based Ethernet VPN
Publication Date    : February 2015
Author(s)           : A. Sajassi, Ed., R. Aggarwal, N. Bitar, A. Isaac, J. =
Uttaro, J. Drake, W. Henderickx
Category            : PROPOSED STANDARD
Source              : Layer 2 Virtual Private Networks
Area                : Routing
Stream              : IETF
Verifying Party     : IESG

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


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From: Zhuangshunwan <zhuangshunwan@huawei.com>
To: "Jakob Heitz (jheitz)" <jheitz@cisco.com>, BESS <bess@ietf.org>
Thread-Topic: Encoding a 20 bit label in a 24 bit field.
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Subject: Re: [bess] Encoding a 20 bit label in a 24 bit field.
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It looks good to me. I have not found any specific purposes of these bits i=
n RFC7432. Maybe I missed something.

Thanks,=20
Shunwan

-----Original Message-----
From: Jakob Heitz (jheitz) [mailto:jheitz@cisco.com]=20
Sent: Tuesday, October 16, 2018 9:24 AM
To: Zhuangshunwan <zhuangshunwan@huawei.com>; BESS <bess@ietf.org>
Subject: RE: Encoding a 20 bit label in a 24 bit field.

How about:
The lower order 4 bits SHOULD be sent as 0 and ignored on receipt.

Regards,
Jakob.


-----Original Message-----
From: Zhuangshunwan <zhuangshunwan@huawei.com>
Sent: Monday, October 15, 2018 6:02 PM
To: Jakob Heitz (jheitz) <jheitz@cisco.com>; BESS <bess@ietf.org>
Subject: RE: Encoding a 20 bit label in a 24 bit field.

It is good to make this explicit. This ambiguity has led to some unnecessar=
y interworking problems.

Should we also need to explicitly define the "bottom of stack" bit in the l=
ow-order bit of the 3-octet label field?

Thanks,
Shunwan

-----Original Message-----
From: BESS [mailto:bess-bounces@ietf.org] On Behalf Of Jakob Heitz (jheitz)
Sent: Tuesday, October 16, 2018 4:21 AM
To: BESS <bess@ietf.org>
Subject: [bess] Encoding a 20 bit label in a 24 bit field.

We have proposed the following erratum for RFC 7432.

Opinions?

Regards,
Jakob.


-----Original Message-----
From: RFC Errata System <rfc-editor@rfc-editor.org>
Sent: Friday, October 12, 2018 12:37 PM
To: Ali Sajassi (sajassi) <sajassi@cisco.com>; raggarwa_1@yahoo.com; nabil.=
n.bitar@verizon.com; aisaac71@bloomberg.net; uttaro@att.com; jdrake@juniper=
.net; wim.henderickx@alcatel-lucent.com; db3546@att.com; aretana.ietf@gmail=
.com; martin.vigoureux@nokia.com; Giles Heron (giheron) <giheron@cisco.com>=
; nabil.n.bitar@verizon.com
Cc: Krishnamoorthy Arumugham (karumugh) <karumugh@cisco.com>; l2vpn@ietf.or=
g; rfc-editor@rfc-editor.org
Subject: [Technical Errata Reported] RFC7432 (5523)

The following errata report has been submitted for RFC7432, "BGP MPLS-Based=
 Ethernet VPN".

--------------------------------------
You may review the report below and at:
http://www.rfc-editor.org/errata/eid5523

--------------------------------------
Type: Technical
Reported by: Krishnamoorthy Arumugham <karumugh@cisco.com>

Section: 7

Original Text
-------------
Clarifications to following sub-sections:
Section 7.1
Section 7.2
Section 7.5


Corrected Text
--------------
Section 7.1:
Add below text to the section 7.1 regarding the encoding of MPLS label:

"The value of the 20-bit MPLS label is encoded in the high-order 20 bits of=
 the 3 bytes MPLS Label field."

Section 7.2:
Add below text to the section 7.2 regarding the encoding of both the MPLS l=
abel fields:

"The value of the 20-bit MPLS label is encoded in the high-order 20 bits of=
 the 3 bytes MPLS Label field for both MPLS Label1 and MPLS Label2."

Section 7.5:
Add below text to the section 7.5 regarding the encoding of ESI Label field=
s:

"The value of the 20-bit MPLS label is encoded in the high-order 20 bits of=
 the ESI Label field."


Notes
-----
MPLS label is a 20-bit value and is stored in a 3 bytes field in a packet. =
The 20-bit MPLS label value is generally stored in higher order 20 bits of =
the 3 byte label field. The exact encoding to be followed for storing MPLS =
label values are not explicitly mentioned in the RFC 7432 under section 7.1=
, 7.2 and 7.5 for different types of EVPN routes. This lead to ambiguity in=
 different implementations. Hence a clarification is required.

Instructions:
-------------
This erratum is currently posted as "Reported". If necessary, please use "R=
eply All" to discuss whether it should be verified or rejected. When a deci=
sion is reached, the verifying party can log in to change the status and ed=
it the report, if necessary.=20

--------------------------------------
RFC7432 (draft-ietf-l2vpn-evpn-11)
--------------------------------------
Title               : BGP MPLS-Based Ethernet VPN
Publication Date    : February 2015
Author(s)           : A. Sajassi, Ed., R. Aggarwal, N. Bitar, A. Isaac, J. =
Uttaro, J. Drake, W. Henderickx
Category            : PROPOSED STANDARD
Source              : Layer 2 Virtual Private Networks
Area                : Routing
Stream              : IETF
Verifying Party     : IESG

_______________________________________________
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From: Xiejingrong <xiejingrong@huawei.com>
To: "bess@ietf.org" <bess@ietf.org>
Thread-Topic: [bess] I-D Action: draft-ietf-bess-mvpn-expl-track-12.txt
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BESS WG:

Had the IANA ack'ed the request of adding the value 2 (Name LIR-PF) ?

I have not seen it in https://www.iana.org/assignments/bgp-parameters/bgp-p=
arameters.xhtml#pmsi-tunnel-attributes

Thanks.
Jingrong

-----Original Message-----
From: BESS [mailto:bess-bounces@ietf.org] On Behalf Of internet-drafts@ietf=
.org
Sent: Wednesday, October 10, 2018 12:53 AM
To: i-d-announce@ietf.org
Cc: bess@ietf.org
Subject: [bess] I-D Action: draft-ietf-bess-mvpn-expl-track-12.txt


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

        Title           : Explicit Tracking with Wild Card Routes in Multic=
ast VPN
        Authors         : Andrew Dolganow
                          Jayant Kotalwar
                          Eric C. Rosen
                          Zhaohui Zhang
	Filename        : draft-ietf-bess-mvpn-expl-track-12.txt
	Pages           : 18
	Date            : 2018-10-09

Abstract:
   The MVPN specifications provide procedures to allow a multicast
   ingress node to invoke "explicit tracking" for a multicast flow or
   set of flows, thus learning the egress nodes for that flow or set of
   flows.  However, the specifications are not completely clear about
   how the explicit tracking procedures work in certain scenarios.  This
   document provides the necessary clarifications.  It also specifies a
   new, optimized explicit tracking procedure.  This new procedure
   allows an ingress node, by sending a single message, to request
   explicit tracking of each of a set of flows, where the set of flows
   is specified using a wildcard mechanism.  This document updates RFCs
   6514, 6625, and 7524.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-bess-mvpn-expl-track/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-bess-mvpn-expl-track-12
https://datatracker.ietf.org/doc/html/draft-ietf-bess-mvpn-expl-track-12

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=3Ddraft-ietf-bess-mvpn-expl-track-12


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

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

_______________________________________________
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From nobody Mon Oct 15 22:19:20 2018
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From: Zhuangshunwan <zhuangshunwan@huawei.com>
To: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>, Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
CC: "jiang.he@ericsson.com" <jiang.he@ericsson.com>, "p.muthu.arul.mozhi@ericsson.com" <p.muthu.arul.mozhi@ericsson.com>, "bess@ietf.org" <bess@ietf.org>, "jaikumar.somasundaram@ericsson.com" <jaikumar.somasundaram@ericsson.com>
Thread-Topic: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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From nobody Tue Oct 16 01:55:59 2018
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From: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>
To: Zhuangshunwan <zhuangshunwan@huawei.com>, Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
CC: "jiang.he@ericsson.com" <jiang.he@ericsson.com>, "p.muthu.arul.mozhi@ericsson.com" <p.muthu.arul.mozhi@ericsson.com>, "bess@ietf.org" <bess@ietf.org>, "jaikumar.somasundaram@ericsson.com" <jaikumar.somasundaram@ericsson.com>
Thread-Topic: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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Date: Tue, 16 Oct 2018 08:55:49 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/0EUct5zOX6LPee4fRMAWXsHsT3M>
Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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Hi,

RFC7432 explains that if there are more than 2 PEs in the ES, then, upon re=
ceiving the AD route withdrawals, the remote PE will flood. That is, it=92l=
l flush the MACs and flood since it does not know who the new DF is, and th=
ere is no backup for a given MAC.

So yes, with more than 2 PEs, there is no backup per se. Note that, even if=
 we had the BDF indication, upon an ES failure the remote PE will start rec=
eiving MAC/IP route withdrawals. Hence unless the re advertisements of the =
MACs start coming immediately, the BDF indication may not avoid flooding an=
yway. We can add the P and B bits here too, but they may not be as useful a=
s in RFC8214.

Thanks,
Jorge


________________________________
From: Zhuangshunwan <zhuangshunwan@huawei.com>
Sent: Tuesday, October 16, 2018 00:19
To: Rabadan, Jorge (Nokia - US/Mountain View); Muthu Arul Mozhi Perumal
Cc: jiang.he@ericsson.com; p.muthu.arul.mozhi@ericsson.com; bess@ietf.org; =
jaikumar.somasundaram@ericsson.com
Subject: RE: [bess] EVPN MH: Backup node behavior in Primary Path Failure

Hi Jorge,

8.4.  Aliasing and Backup Path of RFC7432 says:

<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>

Actually, do we think that the function described in this section only work=
s when there are only 2 PEs in one ES?
When there are more than 2 PEs in one ES, it cannot work unless RFC7432 als=
o introduce the BDF election function defined in RFC8214.

Regards,
Shunwan

From: BESS [mailto:bess-bounces@ietf.org] On Behalf OfRabadan, Jorge (Nokia=
 - US/Mountain View)
Sent: Friday, October 05, 2018 2:01 PM
To: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
Cc: jiang.he@ericsson.com; p.muthu.arul.mozhi@ericsson.com; bess@ietf.org; =
jaikumar.somasundaram@ericsson.com
Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure

That should be true only in RFC8214. That=92s my point=85

From:Muthu Arul Mozhi Perumal <muthu.arul@gmail.com<mailto:muthu.arul@gmail=
.com>>
Date: Friday, October 5, 2018 at 5:47 AM
To: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com<ma=
ilto:jorge.rabadan@nokia.com>>
Cc: "jaikumar.somasundaram@ericsson.com<mailto:jaikumar.somasundaram@ericss=
on.com>" <jaikumar.somasundaram@ericsson.com<mailto:jaikumar.somasundaram@e=
ricsson.com>>, "bess@ietf.org<mailto:bess@ietf.org>" <bess@ietf.org<mailto:=
bess@ietf.org>>, "jiang.he@ericsson.com<mailto:jiang.he@ericsson.com>" <jia=
ng.he@ericsson.com<mailto:jiang.he@ericsson.com>>, "p.muthu.arul.mozhi@eric=
sson.com<mailto:p.muthu.arul.mozhi@ericsson.com>" <p.muthu.arul.mozhi@erics=
son.com<mailto:p.muthu.arul.mozhi@ericsson.com>>
Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure

Thanks, Jorge.

In EVPN single-active dual-homing or EVPN VPWS single-active multi-homing, =
when other PEs realize that the DF is dead, they all need to re-run the DF =
election for sure. However, traffic recovery need not wait until the DF ele=
ction gets over electing a new DF..it only requires the other PEs and the b=
ackup to realize the primary/DF is dead and start forward. That's my point.=
.

Regards,
Muthu

On Fri, Oct 5, 2018 at 1:30 AM Rabadan, Jorge (Nokia - US/Mountain View) <j=
orge.rabadan@nokia.com<mailto:jorge.rabadan@nokia.com>> wrote:
Muthu,


From:Muthu Arul Mozhi Perumal <muthu.arul@gmail.com<mailto:muthu.arul@gmail=
.com>>
Date: Thursday, October 4, 2018 at 5:37 PM
To: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com<ma=
ilto:jorge.rabadan@nokia.com>>
Cc: "jaikumar.somasundaram@ericsson.com<mailto:jaikumar.somasundaram@ericss=
on.com>" <jaikumar.somasundaram@ericsson.com<mailto:jaikumar.somasundaram@e=
ricsson.com>>, "bess@ietf.org<mailto:bess@ietf.org>" <bess@ietf.org<mailto:=
bess@ietf.org>>, "jiang.he@ericsson.com<mailto:jiang.he@ericsson.com>" <jia=
ng.he@ericsson.com<mailto:jiang.he@ericsson.com>>, "p.muthu.arul.mozhi@eric=
sson.com<mailto:p.muthu.arul.mozhi@ericsson.com>" <p.muthu.arul.mozhi@erics=
son.com<mailto:p.muthu.arul.mozhi@ericsson.com>>
Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure

Thanks, Jorge. This is inline with my thinking. So, in single-active multih=
oming, once the primary is dead we don't need to wait for the DF election t=
o happen for the backup (or some other PE in the ES) to become active and s=
tart forwarding traffic over the ES, instead it only requires the remote PE=
s and backup to realize that the primary is dead (thru' NH tracking / BFD) =
and start forwarding over the ES, right?
[JORGE] When the other PEs in the ES realize the DF is dead, they need to r=
emove the dead PE from the candidate list and run DF Election. You may opti=
mize things if you only have two PEs in the ES (such as skip the timer) but=
 if you have more than 2 PEs in the ES, there is really no concept of backu=
p PE in RFC7432, but simply the other PEs are non-DF. However, the concept =
of backup PE in an ES with more than two PEs is specified in RFC8214, where=
 all the PEs in the ES not only elect a DF but also a backup DF, and signal=
 this backup condition in the AD per-EVI routes. Note this is not there in =
RFC7432.

Regards,
Muthu

On Thu, Oct 4, 2018 at 8:10 PM Rabadan, Jorge (Nokia - US/Mountain View) <j=
orge.rabadan@nokia.com<mailto:jorge.rabadan@nokia.com>> wrote:
Muthu,

About this:

Suppose we have a full mesh of iBGP sessions b/w the PEs, then who would wi=
thdraw the routes if the primary PE / DF itself fails? Instead, the BGP ses=
sion would timeout causing the primary PE's neighbors to flush out the A-D =
routes received from the primary PE, right? This can take several seconds, =
isn't it?

No, not in the implementations I know of. Next Hop tracking will immediatel=
y detect that the PE is not in the network anymore and the routes will be i=
nvalidated. You can also bootstrap the BGP sessions to BFD.
But that has nothing to do with EVPN!.. it=92s regular BGP.

Thx
Jorge

From:Muthu Arul Mozhi Perumal <muthu.arul@gmail.com<mailto:muthu.arul@gmail=
.com>>
Date: Thursday, October 4, 2018 at 1:14 PM
To: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com<ma=
ilto:jorge.rabadan@nokia.com>>
Cc: "jaikumar.somasundaram@ericsson.com<mailto:jaikumar.somasundaram@ericss=
on.com>" <jaikumar.somasundaram@ericsson.com<mailto:jaikumar.somasundaram@e=
ricsson.com>>, "bess@ietf.org<mailto:bess@ietf.org>" <bess@ietf.org<mailto:=
bess@ietf.org>>, "jiang.he@ericsson.com<mailto:jiang.he@ericsson.com>" <jia=
ng.he@ericsson.com<mailto:jiang.he@ericsson.com>>, "p.muthu.arul.mozhi@eric=
sson.com<mailto:p.muthu.arul.mozhi@ericsson.com>" <p.muthu.arul.mozhi@erics=
son.com<mailto:p.muthu.arul.mozhi@ericsson.com>>
Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure

Please see inline..

On Thu, Oct 4, 2018 at 3:33 PM Rabadan, Jorge (Nokia - US/Mountain View) <j=
orge.rabadan@nokia.com<mailto:jorge.rabadan@nokia.com>> wrote:
In-line.

Thx
Jorge

From:Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com<mailto:jaiku=
mar.somasundaram@ericsson.com>>
Date: Thursday, October 4, 2018 at 11:28 AM
To: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com<ma=
ilto:jorge.rabadan@nokia.com>>, "bess@ietf.org<mailto:bess@ietf.org>" <bess=
@ietf.org<mailto:bess@ietf.org>>
Cc: Jiang He <jiang.he@ericsson.com<mailto:jiang.he@ericsson.com>>, P Muthu=
 Arul Mozhi <p.muthu.arul.mozhi@ericsson.com<mailto:p.muthu.arul.mozhi@eric=
sson.com>>
Subject: RE: [bess] EVPN MH: Backup node behavior in Primary Path Failure

Thanks Jorge for the quick reply.
Please find further question below.

From: Rabadan, Jorge (Nokia - US/Mountain View) <jorge.rabadan@nokia.com<ma=
ilto:jorge.rabadan@nokia.com>>
Sent: Thursday, October 4, 2018 1:52 PM
To: Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com<mailto:jaikum=
ar.somasundaram@ericsson.com>>;bess@ietf.org<mailto:bess@ietf.org>
Cc: Jiang He <jiang.he@ericsson.com<mailto:jiang.he@ericsson.com>>; P Muthu=
 Arul Mozhi <p.muthu.arul.mozhi@ericsson.com<mailto:p.muthu.arul.mozhi@eric=
sson.com>>
Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure

Hi,


Questions:
1.      Will the node in backup mode forward the packet to CE?

[JORGE] as soon as it becomes DF it can forward packets to the CE. The back=
up node will have to run DF election upon the ES route withdrawal from the =
primary. If AC-DF is enabled, it can also react to the withdrawal of AD rou=
tes from the primary PE.

[Jai] Does that mean if any packet comes to a node that is still in the bac=
kup mode will get dropped, before the new DF election is complete? Why cant=
 this be used as FRR? Or what is the use case of having backup node(s)?

[JORGE2] when the primary node fails, ES and AD routes are withdrawn.
Suppose we have a full mesh of iBGP sessions b/w the PEs, then who would wi=
thdraw the routes if the primary PE / DF itself fails? Instead, the BGP ses=
sion would timeout causing the primary PE's neighbors to flush out the A-D =
routes received from the primary PE, right? This can take several seconds, =
isn't it?

Regards,
Muthu

The AD route withdrawal is an indication for remote nodes that they have to=
 send traffic to the backup (for a given MAC) or to flush the MACs if there=
 are more than 2 PEs in the ES. Around the same time or maybe earlier, the =
ES route withdrawal will make the backup PE take over as DF. So the overall=
 convergence time will depend on how/when those two things happen in time. =
Only the DF PE can forward traffic. A non-DF can never forward traffic or t=
here will be risk of duplicate packets.


2.      Will all the nodes in backup mode forward the packet before DF elec=
tion?

[JORGE] Only the new DF can forward.



3. If they forward, how is duplicate packets handled, in this case?
[JORGE] see above.

My two cents..

Thanks.
Jorge



From:BESS <bess-bounces@ietf.org<mailto:bess-bounces@ietf.org>> on behalf o=
f Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com<mailto:jaikumar=
.somasundaram@ericsson.com>>
Date: Thursday, October 4, 2018 at 10:03 AM
To: "bess@ietf.org<mailto:bess@ietf.org>" <bess@ietf.org<mailto:bess@ietf.o=
rg>>
Cc: Jiang He <jiang.he@ericsson.com<mailto:jiang.he@ericsson.com>>, P Muthu=
 Arul Mozhi <p.muthu.arul.mozhi@ericsson.com<mailto:p.muthu.arul.mozhi@eric=
sson.com>>
Subject: [bess] EVPN MH: Backup node behavior in Primary Path Failure


Hello Everyone,

Sorry if it is a duplicate. I repost this query as I did not receive any re=
sponse yet.
(I was wondering if this mail already reached the group or not)


I have a question on Primary PE encountering a failure in EVPN multihoming

in single active mode.



RFC7432, section 14.1.1:

<snip>

   If there is more than one backup PE for a given ES, the remote PE

   MUST use the primary PE's withdrawal of its set of Ethernet A-D per

   ES routes as a trigger to start flooding traffic for the associated

   MAC addresses (as long as flooding of unknown unicast packets is

   administratively allowed), as it is not possible to select a single

   backup PE.

</snip>



Questions:

1. Will the node in backup mode forward the packet to CE?

2. Will all the nodes in backup mode forward the packet before DF election?

3. If they forward, how is duplicate packets handled, in this case?



Please help me anwere these questions.



Thanks & Regards

Jaikumar S


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

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<!-- This file has been automatically generated. See web/README.md -->
<div style=3D"direction: ltr;">
<div>Hi,</div>
<div style=3D"direction: ltr;"><br>
</div>
<div style=3D"direction: ltr;">RFC7432 explains that if there are more than=
 2 PEs in the ES, then, upon receiving the AD route withdrawals, the remote=
 PE will flood. That is, it=92ll flush the MACs and flood since it does not=
 know who the new DF is, and there is
 no backup for a given MAC.</div>
<div style=3D"direction: ltr;"><br>
</div>
<div style=3D"direction: ltr;">So yes, with more than 2 PEs, there is no ba=
ckup per se. Note that, even if we had the BDF indication, upon an ES failu=
re the remote PE will start receiving MAC/IP route withdrawals. Hence unles=
s the re advertisements of the MACs
 start coming immediately, the BDF indication may not avoid flooding anyway=
. We can add the P and B bits here too, but they may not be as useful as in=
 RFC8214.</div>
<div style=3D"direction: ltr;"><br>
</div>
<div style=3D"direction: ltr;">Thanks,</div>
<div style=3D"direction: ltr;">Jorge</div>
<div style=3D"direction: ltr;"><br>
</div>
<div><br>
</div>
<div class=3D"ms-outlook-ios-signature"></div>
</div>
<div>
<hr style=3D"display:inline-block;width:98%" tabindex=3D"-1">
<div id=3D"divRplyFwdMsg" dir=3D"dir=3D&quot;ltr&quot;"><font face=3D"Calib=
ri, sans-serif" style=3D"font-size:11pt" color=3D"#000000"><b>From:</b> Zhu=
angshunwan &lt;zhuangshunwan@huawei.com&gt;<br>
<b>Sent:</b> Tuesday, October 16, 2018 00:19<br>
<b>To:</b> Rabadan, Jorge (Nokia - US/Mountain View); Muthu Arul Mozhi Peru=
mal<br>
<b>Cc:</b> jiang.he@ericsson.com; p.muthu.arul.mozhi@ericsson.com; bess@iet=
f.org; jaikumar.somasundaram@ericsson.com<br>
<b>Subject:</b> RE: [bess] EVPN MH: Backup node behavior in Primary Path Fa=
ilure
<div>&nbsp;</div>
</font></div>
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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi Jorge,</span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">8.4.&nbsp; Aliasing an=
d Backup Path of RFC7432 says:</span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&lt;snip&gt;</span></p=
>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">.&nbsp;&nbsp; The back=
up path is a closely related function, but it is used in</span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">.&nbsp;&nbsp; Single-A=
ctive redundancy mode.&nbsp; In this case, a PE also advertises</span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">.&nbsp;&nbsp; that it =
has reachability to a given EVI/ES using the same combination</span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">.&nbsp;&nbsp; of Ether=
net A-D per EVI route and Ethernet A-D per ES route as</span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">.&nbsp;&nbsp; discusse=
d above, but with the &quot;Single-Active&quot; bit in the flags of the</sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">.&nbsp;&nbsp; ESI Labe=
l extended community set to 1.&nbsp; A remote PE that receives a</span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">.&nbsp;&nbsp; MAC/IP A=
dvertisement route with a non-reserved ESI SHOULD consider</span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">.&nbsp;&nbsp; the adve=
rtised MAC address to be reachable via any PE that has</span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">.&nbsp;&nbsp; advertis=
ed this combination of Ethernet A-D routes, and it SHOULD</span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">.&nbsp;&nbsp; install =
a backup path for that MAC address.</span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&lt;snip&gt;&nbsp;&nbs=
p; </span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Actually, do we think =
that the function described in this section only works when there are only =
2 PEs in one ES?</span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">When there are more th=
an 2 PEs in one ES, it cannot work unless RFC7432 also introduce the BDF el=
ection function defined in RFC8214.</span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Regards,</span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Shunwan</span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span></p>
<div>
<div style=3D"border:none; border-top:solid #E1E1E1 1.0pt; padding:3.0pt 0c=
m 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> BESS [mailto:bess-bounces@ietf.org] <b>=
On Behalf Of</b>Rabadan, Jorge (Nokia - US/Mountain View)<br>
<b>Sent:</b> Friday, October 05, 2018 2:01 PM<br>
<b>To:</b> Muthu Arul Mozhi Perumal &lt;muthu.arul@gmail.com&gt;<br>
<b>Cc:</b> jiang.he@ericsson.com; p.muthu.arul.mozhi@ericsson.com; bess@iet=
f.org; jaikumar.somasundaram@ericsson.com<br>
<b>Subject:</b> Re: [bess] EVPN MH: Backup node behavior in Primary Path Fa=
ilure</p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt; font-family:Consola=
s">That should be true only in RFC8214. That=92s my point=85</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt; font-family:Consola=
s">&nbsp;</span></p>
<div style=3D"border:none; border-top:solid #B5C4DF 1.0pt; padding:3.0pt 0c=
m 0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><b><span style=3D"font-=
size:12.0pt; color:black">From:</span></b><span style=3D"font-size:12.0pt; =
color:black">Muthu Arul Mozhi Perumal &lt;<a href=3D"mailto:muthu.arul@gmai=
l.com">muthu.arul@gmail.com</a>&gt;<br>
<b>Date: </b>Friday, October 5, 2018 at 5:47 AM<br>
<b>To: </b>&quot;Rabadan, Jorge (Nokia - US/Mountain View)&quot; &lt;<a hre=
f=3D"mailto:jorge.rabadan@nokia.com">jorge.rabadan@nokia.com</a>&gt;<br>
<b>Cc: </b>&quot;<a href=3D"mailto:jaikumar.somasundaram@ericsson.com">jaik=
umar.somasundaram@ericsson.com</a>&quot; &lt;<a href=3D"mailto:jaikumar.som=
asundaram@ericsson.com">jaikumar.somasundaram@ericsson.com</a>&gt;, &quot;<=
a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>&quot; &lt;<a href=3D"mail=
to:bess@ietf.org">bess@ietf.org</a>&gt;,
 &quot;<a href=3D"mailto:jiang.he@ericsson.com">jiang.he@ericsson.com</a>&q=
uot; &lt;<a href=3D"mailto:jiang.he@ericsson.com">jiang.he@ericsson.com</a>=
&gt;, &quot;<a href=3D"mailto:p.muthu.arul.mozhi@ericsson.com">p.muthu.arul=
.mozhi@ericsson.com</a>&quot; &lt;<a href=3D"mailto:p.muthu.arul.mozhi@eric=
sson.com">p.muthu.arul.mozhi@ericsson.com</a>&gt;<br>
<b>Subject: </b>Re: [bess] EVPN MH: Backup node behavior in Primary Path Fa=
ilure</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;</p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-fam=
ily:&quot;Courier New&quot;">Thanks, Jorge.</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-fam=
ily:&quot;Courier New&quot;">In EVPN single-active dual-homing or EVPN VPWS=
 single-active multi-homing, when other PEs realize that the DF is dead, th=
ey all need to re-run the DF election for sure.
 However, traffic recovery need not wait until the DF election gets over el=
ecting a new DF..it only requires the other PEs and the backup to realize t=
he primary/DF is dead and start forward. That's my point..</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;</p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-fam=
ily:&quot;Courier New&quot;">Regards,</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-fam=
ily:&quot;Courier New&quot;">Muthu</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;</p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">On Fri, Oct 5, 2018 at =
1:30 AM Rabadan, Jorge (Nokia - US/Mountain View) &lt;<a href=3D"mailto:jor=
ge.rabadan@nokia.com">jorge.rabadan@nokia.com</a>&gt; wrote:</p>
</div>
<blockquote style=3D"border:none; border-left:solid #CCCCCC 1.0pt; padding:=
0cm 0cm 0cm 6.0pt; margin-left:4.8pt; margin-top:5.0pt; margin-right:0cm; m=
argin-bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:10.5pt; font-family:Consolas">Muthu,</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:10.5pt; font-family:Consolas">&nbsp;</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:10.5pt; font-family:Consolas">&nbsp;</span></p>
<div style=3D"border:none; border-top:solid #B5C4DF 1.0pt; padding:3.0pt 0c=
m 0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><b><span style=3D"font-=
size:12.0pt; color:black">From:</span></b><span style=3D"font-size:12.0pt; =
color:black">Muthu Arul Mozhi Perumal &lt;<a href=3D"mailto:muthu.arul@gmai=
l.com" target=3D"_blank">muthu.arul@gmail.com</a>&gt;<br>
<b>Date: </b>Thursday, October 4, 2018 at 5:37 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>&quot;<a href=3D"mailto:jaikumar.somasundaram@ericsson.com" targ=
et=3D"_blank">jaikumar.somasundaram@ericsson.com</a>&quot; &lt;<a href=3D"m=
ailto:jaikumar.somasundaram@ericsson.com" target=3D"_blank">jaikumar.somasu=
ndaram@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.org</a>&g=
t;, &quot;<a href=3D"mailto:jiang.he@ericsson.com" target=3D"_blank">jiang.=
he@ericsson.com</a>&quot; &lt;<a href=3D"mailto:jiang.he@ericsson.com" targ=
et=3D"_blank">jiang.he@ericsson.com</a>&gt;, &quot;<a href=3D"mailto:p.muth=
u.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@ericsson.co=
m</a>&quot;
 &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] EVPN MH: Backup node behavior in Primary Path Fa=
ilure</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">&nbsp;</p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span style=3D"font-siz=
e:12.0pt; font-family:&quot;Arial&quot;,sans-serif">Thanks, Jorge. This is =
inline with my thinking. So, in single-active multihoming, once the primary=
 is dead we don't need to wait for the DF election
 to happen for the backup (or some other PE in the ES) to become active and=
 start forwarding traffic over the ES, instead it only requires the remote =
PEs and backup to realize that the primary is dead (thru' NH tracking / BFD=
) and start forwarding over the
 ES, right?</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><span style=3D"font-siz=
e:10.5pt; font-family:Consolas">[JORGE] When the other PEs in the ES realiz=
e the DF is dead, they need to remove the dead PE from the candidate list a=
nd run DF Election. You may optimize things
 if you only have two PEs in the ES (such as skip the timer) but if you hav=
e more than 2 PEs in the ES, there is really no concept of backup PE in RFC=
7432, but simply the other PEs are non-DF. However, the concept of backup P=
E in an ES with more than two PEs
 is specified in RFC8214, where all the PEs in the ES not only elect a DF b=
ut also a backup DF, and signal this backup condition in the AD per-EVI rou=
tes. Note this is not there in RFC7432.</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span style=3D"font-siz=
e:12.0pt; font-family:&quot;Arial&quot;,sans-serif">&nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span style=3D"font-siz=
e:12.0pt; font-family:&quot;Arial&quot;,sans-serif">Regards,</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span style=3D"font-siz=
e:12.0pt; font-family:&quot;Arial&quot;,sans-serif">Muthu</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span style=3D"font-siz=
e:12.0pt; font-family:&quot;Arial&quot;,sans-serif">&nbsp;</span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">On Thu, Oct 4, 2018 at =
8:10 PM Rabadan, Jorge (Nokia - US/Mountain View) &lt;<a href=3D"mailto:jor=
ge.rabadan@nokia.com" target=3D"_blank">jorge.rabadan@nokia.com</a>&gt; wro=
te:</p>
</div>
<blockquote style=3D"border:none; border-left:solid #CCCCCC 1.0pt; padding:=
0cm 0cm 0cm 6.0pt; margin-left:4.8pt; margin-top:5.0pt; margin-right:0cm; m=
argin-bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span style=3D"font-siz=
e:10.5pt; font-family:Consolas">Muthu,</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span style=3D"font-siz=
e:10.5pt; font-family:Consolas">&nbsp;</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span style=3D"font-siz=
e:10.5pt; font-family:Consolas">About this:</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span style=3D"font-siz=
e:10.5pt; font-family:Consolas">&nbsp;</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt"><span style=3D"font-si=
ze:12.0pt; font-family:&quot;Arial&quot;,sans-serif">Suppose we have a full=
 mesh of iBGP sessions b/w the PEs, then who would withdraw the routes if t=
he primary PE / DF itself fails? Instead, the BGP
 session would timeout causing the primary PE's neighbors to flush out the =
A-D routes received from the primary PE, right? This can take several secon=
ds, isn't it?</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span style=3D"font-siz=
e:12.0pt; font-family:&quot;Arial&quot;,sans-serif">&nbsp;</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span style=3D"font-siz=
e:10.5pt; font-family:Consolas">No, not in the implementations I know of. N=
ext Hop tracking will immediately detect that the PE is not in the network =
anymore and the routes will be invalidated.
 You can also bootstrap the BGP sessions to BFD. </span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span style=3D"font-siz=
e:10.5pt; font-family:Consolas">But that has nothing to do with EVPN!.. it=
=92s regular BGP.</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span style=3D"font-siz=
e:10.5pt; font-family:Consolas">&nbsp;</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span style=3D"font-siz=
e:10.5pt; font-family:Consolas">Thx</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span style=3D"font-siz=
e:10.5pt; font-family:Consolas">Jorge</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt"><span style=3D"font-siz=
e:10.5pt; font-family:Consolas">&nbsp;</span></p>
<div style=3D"border:none; border-top:solid #B5C4DF 1.0pt; padding:3.0pt 0c=
m 0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt"><b><span style=3D"font=
-size:12.0pt; color:black">From:</span></b><span style=3D"font-size:12.0pt;=
 color:black">Muthu Arul Mozhi Perumal &lt;<a href=3D"mailto:muthu.arul@gma=
il.com" target=3D"_blank">muthu.arul@gmail.com</a>&gt;<br>
<b>Date: </b>Thursday, October 4, 2018 at 1:14 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>&quot;<a href=3D"mailto:jaikumar.somasundaram@ericsson.com" targ=
et=3D"_blank">jaikumar.somasundaram@ericsson.com</a>&quot; &lt;<a href=3D"m=
ailto:jaikumar.somasundaram@ericsson.com" target=3D"_blank">jaikumar.somasu=
ndaram@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.org</a>&g=
t;, &quot;<a href=3D"mailto:jiang.he@ericsson.com" target=3D"_blank">jiang.=
he@ericsson.com</a>&quot; &lt;<a href=3D"mailto:jiang.he@ericsson.com" targ=
et=3D"_blank">jiang.he@ericsson.com</a>&gt;, &quot;<a href=3D"mailto:p.muth=
u.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@ericsson.co=
m</a>&quot;
 &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] EVPN MH: Backup node behavior in Primary Path Fa=
ilure</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt">&nbsp;</p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt"><span style=3D"font-si=
ze:12.0pt; font-family:&quot;Arial&quot;,sans-serif">Please see inline..</s=
pan></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt">&nbsp;</p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt">On Thu, Oct 4, 2018 at=
 3:33 PM Rabadan, Jorge (Nokia - US/Mountain View) &lt;<a href=3D"mailto:jo=
rge.rabadan@nokia.com" target=3D"_blank">jorge.rabadan@nokia.com</a>&gt; wr=
ote:</p>
</div>
<blockquote style=3D"border:none; border-left:solid #CCCCCC 1.0pt; padding:=
0cm 0cm 0cm 6.0pt; margin-left:4.8pt; margin-top:5.0pt; margin-right:0cm; m=
argin-bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt"><span style=3D"font-si=
ze:10.5pt; font-family:Consolas">In-line.</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt"><span style=3D"font-si=
ze:10.5pt; font-family:Consolas">&nbsp;</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt"><span style=3D"font-si=
ze:10.5pt; font-family:Consolas">Thx</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt"><span style=3D"font-si=
ze:10.5pt; font-family:Consolas">Jorge</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt"><span style=3D"font-si=
ze:10.5pt; font-family:Consolas">&nbsp;</span></p>
<div style=3D"border:none; border-top:solid #B5C4DF 1.0pt; padding:3.0pt 0c=
m 0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:144.0pt"><b><span style=3D"font=
-size:12.0pt; color:black">From:</span></b><span style=3D"font-size:12.0pt;=
 color:black">Jaikumar Somasundaram &lt;<a href=3D"mailto:jaikumar.somasund=
aram@ericsson.com" target=3D"_blank">jaikumar.somasundaram@ericsson.com</a>=
&gt;<br>
<b>Date: </b>Thursday, October 4, 2018 at 11:28 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;, &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">b=
ess@ietf.org</a>&gt;<br>
<b>Cc: </b>Jiang He &lt;<a href=3D"mailto:jiang.he@ericsson.com" target=3D"=
_blank">jiang.he@ericsson.com</a>&gt;, P Muthu Arul Mozhi &lt;<a href=3D"ma=
ilto:p.muthu.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@=
ericsson.com</a>&gt;<br>
<b>Subject: </b>RE: [bess] EVPN MH: Backup node behavior in Primary Path Fa=
ilure</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:144.0pt">&nbsp;</p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:144.0pt"><span style=3D"color:#=
0070C0">Thanks Jorge for the quick reply.</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:144.0pt"><span style=3D"color:#=
0070C0">Please find further question below.</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:144.0pt">&nbsp;</p>
<div>
<div style=3D"border:none; border-top:solid #E1E1E1 1.0pt; padding:3.0pt 0c=
m 0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:144.0pt"><b>From:</b> Rabadan, =
Jorge (Nokia - US/Mountain View) &lt;<a href=3D"mailto:jorge.rabadan@nokia.=
com" target=3D"_blank">jorge.rabadan@nokia.com</a>&gt;<br>
<b>Sent:</b> Thursday, October 4, 2018 1:52 PM<br>
<b>To:</b> Jaikumar Somasundaram &lt;<a href=3D"mailto:jaikumar.somasundara=
m@ericsson.com" target=3D"_blank">jaikumar.somasundaram@ericsson.com</a>&gt=
;;<a href=3D"mailto:bess@ietf.org" target=3D"_blank">bess@ietf.org</a><br>
<b>Cc:</b> Jiang He &lt;<a href=3D"mailto:jiang.he@ericsson.com" target=3D"=
_blank">jiang.he@ericsson.com</a>&gt;; P Muthu Arul Mozhi &lt;<a href=3D"ma=
ilto:p.muthu.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@=
ericsson.com</a>&gt;<br>
<b>Subject:</b> Re: [bess] EVPN MH: Backup node behavior in Primary Path Fa=
ilure</p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:144.0pt">&nbsp;</p>
<p class=3D"MsoNormal" style=3D"margin-left:144.0pt"><span style=3D"font-si=
ze:10.5pt; font-family:Consolas">Hi,</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:144.0pt"><span style=3D"font-si=
ze:10.5pt; font-family:Consolas">&nbsp;</span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:180.0pt">
Questions:</p>
<p class=3D"MsoNormal" style=3D"margin-left:198.0pt">1.<span style=3D"font-=
size:7.0pt; font-family:&quot;Times New Roman&quot;,serif">&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;</span>Will the node in backup mode forward the packet =
to CE?</p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:144.0pt">
[JORGE] as soon as it becomes DF it can forward packets to the CE. The back=
up node will have to run DF election upon the ES route withdrawal from the =
primary. If AC-DF is enabled, it can also react to the withdrawal of AD rou=
tes from the primary PE.</p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:144.0pt">
<b><i>[Jai] Does that mean if any packet comes to a node that is still in t=
he backup mode will get dropped, before the new DF election is complete? Wh=
y cant this be used as FRR? Or what is the use case of having backup node(s=
)?</i></b></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:108.0pt">
<b><span style=3D"font-size:10.5pt; font-family:Consolas">[JORGE2] when the=
 primary node fails, ES and AD routes are withdrawn.</span></b></p>
</div>
</div>
</blockquote>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt"><span style=3D"font-si=
ze:12.0pt; font-family:&quot;Arial&quot;,sans-serif">Suppose we have a full=
 mesh of iBGP sessions b/w the PEs, then who would withdraw the routes if t=
he primary PE / DF itself fails? Instead, the BGP
 session would timeout causing the primary PE's neighbors to flush out the =
A-D routes received from the primary PE, right? This can take several secon=
ds, isn't it?</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt"><span style=3D"font-si=
ze:12.0pt; font-family:&quot;Arial&quot;,sans-serif">&nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt"><span style=3D"font-si=
ze:12.0pt; font-family:&quot;Arial&quot;,sans-serif">Regards,</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt"><span style=3D"font-si=
ze:12.0pt; font-family:&quot;Arial&quot;,sans-serif">Muthu</span></p>
</div>
</div>
<blockquote style=3D"border:none; border-left:solid #CCCCCC 1.0pt; padding:=
0cm 0cm 0cm 6.0pt; margin-left:4.8pt; margin-top:5.0pt; margin-right:0cm; m=
argin-bottom:5.0pt">
<div>
<div>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:108.0pt">
<b><span style=3D"font-size:10.5pt; font-family:Consolas">The AD route with=
drawal is an indication for remote nodes that they have to send traffic to =
the backup (for a given MAC) or to flush the MACs if there are more than 2 =
PEs in the ES. Around the same time
 or maybe earlier, the ES route withdrawal will make the backup PE take ove=
r as DF. So the overall convergence time will depend on how/when those two =
things happen in time. Only the DF PE can forward traffic. A non-DF can nev=
er forward traffic or there will
 be risk of duplicate packets.</span></b></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:144.0pt">
&nbsp;</p>
<p class=3D"MsoNormal" style=3D"margin-left:198.0pt">2.<span style=3D"font-=
size:7.0pt; font-family:&quot;Times New Roman&quot;,serif">&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;</span>Will all the nodes in backup mode forward the pa=
cket before DF election?</p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:144.0pt">
[JORGE] Only the new DF can forward.</p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:144.0pt">
&nbsp;</p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:180.0pt">
3. If they forward, how is duplicate packets handled, in this case?</p>
<p class=3D"MsoNormal" style=3D"margin-left:144.0pt"><span style=3D"font-si=
ze:10.5pt; font-family:Consolas">[JORGE] see above.</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:144.0pt"><span style=3D"font-si=
ze:10.5pt; font-family:Consolas">&nbsp;</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:144.0pt"><span style=3D"font-si=
ze:10.5pt; font-family:Consolas">My two cents..</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:144.0pt"><span style=3D"font-si=
ze:10.5pt; font-family:Consolas">&nbsp;</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:144.0pt"><span style=3D"font-si=
ze:10.5pt; font-family:Consolas">Thanks.</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:144.0pt"><span style=3D"font-si=
ze:10.5pt; font-family:Consolas">Jorge</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:144.0pt"><span style=3D"font-si=
ze:10.5pt; font-family:Consolas">&nbsp;</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:144.0pt"><span style=3D"font-si=
ze:10.5pt; font-family:Consolas">&nbsp;</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:144.0pt"><span style=3D"font-si=
ze:10.5pt; font-family:Consolas">&nbsp;</span></p>
<div style=3D"border:none; border-top:solid #B5C4DF 1.0pt; padding:3.0pt 0c=
m 0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:144.0pt"><b><span style=3D"font=
-size:12.0pt; color:black">From:</span></b><span style=3D"font-size:12.0pt;=
 color:black">BESS &lt;<a href=3D"mailto:bess-bounces@ietf.org" target=3D"_=
blank">bess-bounces@ietf.org</a>&gt; on behalf of
 Jaikumar Somasundaram &lt;<a href=3D"mailto:jaikumar.somasundaram@ericsson=
.com" target=3D"_blank">jaikumar.somasundaram@ericsson.com</a>&gt;<br>
<b>Date: </b>Thursday, October 4, 2018 at 10:03 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>Jiang He &lt;<a href=3D"mailto:jiang.he@ericsson.com" target=3D"=
_blank">jiang.he@ericsson.com</a>&gt;, P Muthu Arul Mozhi &lt;<a href=3D"ma=
ilto:p.muthu.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@=
ericsson.com</a>&gt;<br>
<b>Subject: </b>[bess] EVPN MH: Backup node behavior in Primary Path Failur=
e</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:144.0pt">&nbsp;</p>
</div>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:144.0pt">
Hello Everyone,</p>
<p class=3D"MsoNormal" style=3D"margin-left:144.0pt">&nbsp;</p>
<p class=3D"MsoNormal" style=3D"margin-left:144.0pt">Sorry if it is a dupli=
cate. I repost this query as I did not receive any response yet.</p>
<p class=3D"MsoNormal" style=3D"margin-left:144.0pt">(I was wondering if th=
is mail already reached the group or not)</p>
<p class=3D"MsoNormal" style=3D"margin-left:144.0pt">&nbsp;</p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:144.0pt">
I have a question on Primary PE encountering a failure in EVPN multihoming<=
/p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:144.0pt">
in single active mode.</p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:144.0pt">
&nbsp;</p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:144.0pt">
RFC7432, section 14.1.1:</p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:144.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">&lt;snip&gt;</span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:144.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">&nbsp;&nbsp; If there i=
s more than one backup PE for a given ES, the remote PE</span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:144.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">&nbsp;&nbsp; MUST use t=
he primary PE's withdrawal of its set of Ethernet A-D per</span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:144.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">&nbsp;&nbsp; ES routes =
as a trigger to start flooding traffic for the associated</span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:144.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">&nbsp;&nbsp; MAC addres=
ses (as long as flooding of unknown unicast packets is</span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:144.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">&nbsp;&nbsp; administra=
tively allowed), as it is not possible to select a single</span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:144.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">&nbsp;&nbsp; backup PE.=
</span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:144.0pt">
<span style=3D"font-family:&quot;Courier New&quot;">&lt;/snip&gt;</span></p=
>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:144.0pt">
&nbsp;</p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:144.0pt">
Questions:</p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:144.0pt">
1. Will the node in backup mode forward the packet to CE?</p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:144.0pt">
2. Will all the nodes in backup mode forward the packet before DF election?=
</p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:144.0pt">
3. If they forward, how is duplicate packets handled, in this case?</p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:144.0pt">
&nbsp;</p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:144.0pt">
Please help me anwere these questions.</p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:144.0pt">
&nbsp;</p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:144.0pt">
Thanks &amp; Regards</p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:144.0pt">
Jaikumar S</p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:144.0pt">
&nbsp;</p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:108.0pt">______________________=
_________________________<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></p>
</blockquote>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</div>
</body>
</html>

--_000_AM0PR07MB384409BA9BB5DD71AECE4B8EF7FE0AM0PR07MB3844eurp_--


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From: John E Drake <jdrake@juniper.net>
To: Zhuangshunwan <zhuangshunwan@huawei.com>, "Jakob Heitz (jheitz)" <jheitz@cisco.com>, BESS <bess@ietf.org>
Thread-Topic: Encoding a 20 bit label in a 24 bit field.
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/y20QlJUzP3xbqox1eQeVNffCtvY>
Subject: Re: [bess] Encoding a 20 bit label in a 24 bit field.
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I don't think that's a good idea because depending upon their position in t=
he stack, these labels may not be at the bottom of the stack.

Yours Irrespectively,

John

> -----Original Message-----
> From: BESS <bess-bounces@ietf.org> On Behalf Of Zhuangshunwan
> Sent: Monday, October 15, 2018 9:02 PM
> To: Jakob Heitz (jheitz) <jheitz@cisco.com>; BESS <bess@ietf.org>
> Subject: Re: [bess] Encoding a 20 bit label in a 24 bit field.
>=20
> It is good to make this explicit. This ambiguity has led to some unnecess=
ary
> interworking problems.
>=20
> Should we also need to explicitly define the "bottom of stack" bit in the=
 low-
> order bit of the 3-octet label field?
>=20
> Thanks,
> Shunwan
>=20
> -----Original Message-----
> From: BESS [mailto:bess-bounces@ietf.org] On Behalf Of Jakob Heitz (jheit=
z)
> Sent: Tuesday, October 16, 2018 4:21 AM
> To: BESS <bess@ietf.org>
> Subject: [bess] Encoding a 20 bit label in a 24 bit field.
>=20
> We have proposed the following erratum for RFC 7432.
>=20
> Opinions?
>=20
> Regards,
> Jakob.
>=20
>=20
> -----Original Message-----
> From: RFC Errata System <rfc-editor@rfc-editor.org>
> Sent: Friday, October 12, 2018 12:37 PM
> To: Ali Sajassi (sajassi) <sajassi@cisco.com>; raggarwa_1@yahoo.com;
> nabil.n.bitar@verizon.com; aisaac71@bloomberg.net; uttaro@att.com;
> jdrake@juniper.net; wim.henderickx@alcatel-lucent.com; db3546@att.com;
> aretana.ietf@gmail.com; martin.vigoureux@nokia.com; Giles Heron
> (giheron) <giheron@cisco.com>; nabil.n.bitar@verizon.com
> Cc: Krishnamoorthy Arumugham (karumugh) <karumugh@cisco.com>;
> l2vpn@ietf.org; rfc-editor@rfc-editor.org
> Subject: [Technical Errata Reported] RFC7432 (5523)
>=20
> The following errata report has been submitted for RFC7432, "BGP MPLS-
> Based Ethernet VPN".
>=20
> --------------------------------------
> You may review the report below and at:
> https://urldefense.proofpoint.com/v2/url?u=3Dhttp-3A__www.rfc-
> 2Deditor.org_errata_eid5523&d=3DDwICAg&c=3DHAkYuh63rsuhr6Scbfh0UjBXeM
> K-ndb3voDTXcWzoCI&r=3DCRB2tJiQePk0cT-h5LGhEWH-
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> BdsY&s=3Dn_iX5KAK2InG-bgMnZHO3o4PH9UZmYKVtes9H7-vA1E&e=3D
>=20
> --------------------------------------
> Type: Technical
> Reported by: Krishnamoorthy Arumugham <karumugh@cisco.com>
>=20
> Section: 7
>=20
> Original Text
> -------------
> Clarifications to following sub-sections:
> Section 7.1
> Section 7.2
> Section 7.5
>=20
>=20
> Corrected Text
> --------------
> Section 7.1:
> Add below text to the section 7.1 regarding the encoding of MPLS label:
>=20
> "The value of the 20-bit MPLS label is encoded in the high-order 20 bits =
of the
> 3 bytes MPLS Label field."
>=20
> Section 7.2:
> Add below text to the section 7.2 regarding the encoding of both the MPLS
> label fields:
>=20
> "The value of the 20-bit MPLS label is encoded in the high-order 20 bits =
of the
> 3 bytes MPLS Label field for both MPLS Label1 and MPLS Label2."
>=20
> Section 7.5:
> Add below text to the section 7.5 regarding the encoding of ESI Label fie=
lds:
>=20
> "The value of the 20-bit MPLS label is encoded in the high-order 20 bits =
of the
> ESI Label field."
>=20
>=20
> Notes
> -----
> MPLS label is a 20-bit value and is stored in a 3 bytes field in a packet=
. The 20-
> bit MPLS label value is generally stored in higher order 20 bits of the 3=
 byte
> label field. The exact encoding to be followed for storing MPLS label val=
ues
> are not explicitly mentioned in the RFC 7432 under section 7.1, 7.2 and 7=
.5
> for different types of EVPN routes. This lead to ambiguity in different
> implementations. Hence a clarification is required.
>=20
> Instructions:
> -------------
> This erratum is currently posted as "Reported". If necessary, please use
> "Reply All" to discuss whether it should be verified or rejected. When a
> decision is reached, the verifying party can log in to change the status =
and
> edit the report, if necessary.
>=20
> --------------------------------------
> RFC7432 (draft-ietf-l2vpn-evpn-11)
> --------------------------------------
> Title               : BGP MPLS-Based Ethernet VPN
> Publication Date    : February 2015
> Author(s)           : A. Sajassi, Ed., R. Aggarwal, N. Bitar, A. Isaac, J=
. Uttaro, J.
> Drake, W. Henderickx
> Category            : PROPOSED STANDARD
> Source              : Layer 2 Virtual Private Networks
> Area                : Routing
> Stream              : IETF
> Verifying Party     : IESG
>=20
> _______________________________________________
> BESS mailing list
> BESS@ietf.org
> https://urldefense.proofpoint.com/v2/url?u=3Dhttps-
> 3A__www.ietf.org_mailman_listinfo_bess&d=3DDwICAg&c=3DHAkYuh63rsuhr6Sc
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> BdsY&s=3DxbhjuaPYmhE7YZHdrs0qRQmpbqzoxbsm12LoU1YI5O8&e=3D
>=20
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From: John E Drake <jdrake@juniper.net>
To: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>, Zhuangshunwan <zhuangshunwan@huawei.com>, Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
CC: "jiang.he@ericsson.com" <jiang.he@ericsson.com>, "p.muthu.arul.mozhi@ericsson.com" <p.muthu.arul.mozhi@ericsson.com>, "jaikumar.somasundaram@ericsson.com" <jaikumar.somasundaram@ericsson.com>, "bess@ietf.org" <bess@ietf.org>
Thread-Topic: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/TIAj5esD_DeZJvaelUxsGnLTGBI>
Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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--_000_BN7PR05MB4354814E7D525E350098B967C7FE0BN7PR05MB4354namp_
Content-Type: text/plain; charset="us-ascii"
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Jorge,

The other possibility for this case is for each PE to advertise a Per EVI E=
thernet A-D route for only those EVIs for which it would become DF if the c=
urrent DF were to fail.

Yours Irrespectively,

John

From: BESS <bess-bounces@ietf.org> On Behalf Of Rabadan, Jorge (Nokia - US/=
Mountain View)
Sent: Tuesday, October 16, 2018 4:56 AM
To: Zhuangshunwan <zhuangshunwan@huawei.com>; Muthu Arul Mozhi Perumal <mut=
hu.arul@gmail.com>
Cc: jiang.he@ericsson.com; p.muthu.arul.mozhi@ericsson.com; jaikumar.somasu=
ndaram@ericsson.com; bess@ietf.org
Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure

Hi,

RFC7432 explains that if there are more than 2 PEs in the ES, then, upon re=
ceiving the AD route withdrawals, the remote PE will flood. That is, it'll =
flush the MACs and flood since it does not know who the new DF is, and ther=
e is no backup for a given MAC.

So yes, with more than 2 PEs, there is no backup per se. Note that, even if=
 we had the BDF indication, upon an ES failure the remote PE will start rec=
eiving MAC/IP route withdrawals. Hence unless the re advertisements of the =
MACs start coming immediately, the BDF indication may not avoid flooding an=
yway.. We can add the P and B bits here too, but they may not be as useful =
as in RFC8214.

Thanks,
Jorge


________________________________
From: Zhuangshunwan <zhuangshunwan@huawei.com<mailto:zhuangshunwan@huawei.c=
om>>
Sent: Tuesday, October 16, 2018 00:19
To: Rabadan, Jorge (Nokia - US/Mountain View); Muthu Arul Mozhi Perumal
Cc: jiang.he@ericsson.com<mailto:jiang.he@ericsson.com>; p.muthu.arul.mozhi=
@ericsson.com<mailto:p.muthu.arul.mozhi@ericsson.com>; bess@ietf.org<mailto=
:bess@ietf.org>; jaikumar.somasundaram@ericsson.com<mailto:jaikumar.somasun=
daram@ericsson.com>
Subject: RE: [bess] EVPN MH: Backup node behavior in Primary Path Failure

Hi Jorge,

8.4.  Aliasing and Backup Path of RFC7432 says:

<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>

Actually, do we think that the function described in this section only work=
s when there are only 2 PEs in one ES?
When there are more than 2 PEs in one ES, it cannot work unless RFC7432 als=
o introduce the BDF election function defined in RFC8214.

Regards,
Shunwan

From: BESS [mailto:bess-bounces@ietf.org] On Behalf OfRabadan, Jorge (Nokia=
 - US/Mountain View)
Sent: Friday, October 05, 2018 2:01 PM
To: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com<mailto:muthu.arul@gmail.=
com>>
Cc: jiang.he@ericsson.com<mailto:jiang.he@ericsson.com>; p.muthu.arul.mozhi=
@ericsson.com<mailto:p.muthu.arul.mozhi@ericsson.com>; bess@ietf.org<mailto=
:bess@ietf.org>; jaikumar.somasundaram@ericsson.com<mailto:jaikumar.somasun=
daram@ericsson.com>
Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure

That should be true only in RFC8214. That's my point...

From:Muthu Arul Mozhi Perumal <muthu.arul@gmail.com<mailto:muthu.arul@gmail=
.com>>
Date: Friday, October 5, 2018 at 5:47 AM
To: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com<ma=
ilto:jorge.rabadan@nokia.com>>
Cc: "jaikumar.somasundaram@ericsson.com<mailto:jaikumar.somasundaram@ericss=
on.com>" <jaikumar.somasundaram@ericsson.com<mailto:jaikumar.somasundaram@e=
ricsson.com>>, "bess@ietf.org<mailto:bess@ietf.org>" <bess@ietf.org<mailto:=
bess@ietf.org>>, "jiang.he@ericsson.com<mailto:jiang.he@ericsson.com>" <jia=
ng.he@ericsson.com<mailto:jiang.he@ericsson.com>>, "p.muthu.arul..mozhi@eri=
csson.com<mailto:p.muthu.arul.mozhi@ericsson.com>" <p.muthu.arul.mozhi@eric=
sson.com<mailto:p.muthu.arul.mozhi@ericsson.com>>
Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure

Thanks, Jorge.

In EVPN single-active dual-homing or EVPN VPWS single-active multi-homing, =
when other PEs realize that the DF is dead, they all need to re-run the DF =
election for sure. However, traffic recovery need not wait until the DF ele=
ction gets over electing a new DF..it only requires the other PEs and the b=
ackup to realize the primary/DF is dead and start forward. That's my point.=
.

Regards,
Muthu

On Fri, Oct 5, 2018 at 1:30 AM Rabadan, Jorge (Nokia - US/Mountain View) <j=
orge.rabadan@nokia.com<mailto:jorge.rabadan@nokia.com>> wrote:
Muthu,


From:Muthu Arul Mozhi Perumal <muthu.arul@gmail.com<mailto:muthu.arul@gmail=
.com>>
Date: Thursday, October 4, 2018 at 5:37 PM
To: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com<ma=
ilto:jorge.rabadan@nokia.com>>
Cc: "jaikumar.somasundaram@ericsson.com<mailto:jaikumar.somasundaram@ericss=
on.com>" <jaikumar.somasundaram@ericsson.com<mailto:jaikumar.somasundaram@e=
ricsson.com>>, "bess@ietf.org<mailto:bess@ietf.org>" <bess@ietf.org<mailto:=
bess@ietf.org>>, "jiang.he@ericsson.com<mailto:jiang.he@ericsson.com>" <jia=
ng.he@ericsson.com<mailto:jiang.he@ericsson.com>>, "p.muthu.arul.mozhi@eric=
sson.com<mailto:p.muthu.arul.mozhi@ericsson.com>" <p..muthu.arul.mozhi@eric=
sson.com<mailto:p.muthu.arul.mozhi@ericsson.com>>
Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure

Thanks, Jorge. This is inline with my thinking. So, in single-active multih=
oming, once the primary is dead we don't need to wait for the DF election t=
o happen for the backup (or some other PE in the ES) to become active and s=
tart forwarding traffic over the ES, instead it only requires the remote PE=
s and backup to realize that the primary is dead (thru' NH tracking / BFD) =
and start forwarding over the ES, right?
[JORGE] When the other PEs in the ES realize the DF is dead, they need to r=
emove the dead PE from the candidate list and run DF Election. You may opti=
mize things if you only have two PEs in the ES (such as skip the timer) but=
 if you have more than 2 PEs in the ES, there is really no concept of backu=
p PE in RFC7432, but simply the other PEs are non-DF. However, the concept =
of backup PE in an ES with more than two PEs is specified in RFC8214, where=
 all the PEs in the ES not only elect a DF but also a backup DF, and signal=
 this backup condition in the AD per-EVI routes. Note this is not there in =
RFC7432.

Regards,
Muthu

On Thu, Oct 4, 2018 at 8:10 PM Rabadan, Jorge (Nokia - US/Mountain View) <j=
orge.rabadan@nokia.com<mailto:jorge.rabadan@nokia.com>> wrote:
Muthu,

About this:

Suppose we have a full mesh of iBGP sessions b/w the PEs, then who would wi=
thdraw the routes if the primary PE / DF itself fails? Instead, the BGP ses=
sion would timeout causing the primary PE's neighbors to flush out the A-D =
routes received from the primary PE, right? This can take several seconds, =
isn't it?

No, not in the implementations I know of. Next Hop tracking will immediatel=
y detect that the PE is not in the network anymore and the routes will be i=
nvalidated. You can also bootstrap the BGP sessions to BFD.
But that has nothing to do with EVPN!.. it's regular BGP.

Thx
Jorge

From:Muthu Arul Mozhi Perumal <muthu.arul@gmail.com<mailto:muthu.arul@gmail=
.com>>
Date: Thursday, October 4, 2018 at 1:14 PM
To: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com<ma=
ilto:jorge.rabadan@nokia.com>>
Cc: "jaikumar.somasundaram@ericsson.com<mailto:jaikumar.somasundaram@ericss=
on.com>" <jaikumar.somasundaram@ericsson.com<mailto:jaikumar.somasundaram@e=
ricsson.com>>, "bess@ietf.org<mailto:bess@ietf.org>" <bess@ietf.org<mailto:=
bess@ietf.org>>, "jiang.he@ericsson.com<mailto:jiang.he@ericsson.com>" <jia=
ng.he@ericsson.com<mailto:jiang.he@ericsson.com>>, "p.muthu.arul.mozhi@eric=
sson.com<mailto:p.muthu.arul.mozhi@ericsson.com>" <p..muthu.arul.mozhi@eric=
sson.com<mailto:p.muthu.arul.mozhi@ericsson.com>>
Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure

Please see inline..

On Thu, Oct 4, 2018 at 3:33 PM Rabadan, Jorge (Nokia - US/Mountain View) <j=
orge.rabadan@nokia.com<mailto:jorge.rabadan@nokia.com>> wrote:
In-line.

Thx
Jorge

From:Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com<mailto:jaiku=
mar.somasundaram@ericsson.com>>
Date: Thursday, October 4, 2018 at 11:28 AM
To: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com<ma=
ilto:jorge.rabadan@nokia.com>>, "bess@ietf.org<mailto:bess@ietf.org>" <bess=
@ietf.org<mailto:bess@ietf.org>>
Cc: Jiang He <jiang.he@ericsson.com<mailto:jiang.he@ericsson.com>>, P Muthu=
 Arul Mozhi <p.muthu.arul.mozhi@ericsson.com<mailto:p.muthu.arul.mozhi@eric=
sson.com>>
Subject: RE: [bess] EVPN MH: Backup node behavior in Primary Path Failure

Thanks Jorge for the quick reply.
Please find further question below.

From: Rabadan, Jorge (Nokia - US/Mountain View) <jorge.rabadan@nokia.com<ma=
ilto:jorge.rabadan@nokia.com>>
Sent: Thursday, October 4, 2018 1:52 PM
To: Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com<mailto:jaikum=
ar.somasundaram@ericsson.com>>;bess@ietf.org<mailto:bess@ietf.org>
Cc: Jiang He <jiang.he@ericsson.com<mailto:jiang.he@ericsson.com>>; P Muthu=
 Arul Mozhi <p.muthu.arul.mozhi@ericsson.com<mailto:p.muthu.arul.mozhi@eric=
sson.com>>
Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure

Hi,


Questions:
1.      Will the node in backup mode forward the packet to CE?

[JORGE] as soon as it becomes DF it can forward packets to the CE. The back=
up node will have to run DF election upon the ES route withdrawal from the =
primary. If AC-DF is enabled, it can also react to the withdrawal of AD rou=
tes from the primary PE.

[Jai] Does that mean if any packet comes to a node that is still in the bac=
kup mode will get dropped, before the new DF election is complete? Why cant=
 this be used as FRR? Or what is the use case of having backup node(s)?

[JORGE2] when the primary node fails, ES and AD routes are withdrawn.
Suppose we have a full mesh of iBGP sessions b/w the PEs, then who would wi=
thdraw the routes if the primary PE / DF itself fails? Instead, the BGP ses=
sion would timeout causing the primary PE's neighbors to flush out the A-D =
routes received from the primary PE, right? This can take several seconds, =
isn't it?

Regards,
Muthu

The AD route withdrawal is an indication for remote nodes that they have to=
 send traffic to the backup (for a given MAC) or to flush the MACs if there=
 are more than 2 PEs in the ES. Around the same time or maybe earlier, the =
ES route withdrawal will make the backup PE take over as DF. So the overall=
 convergence time will depend on how/when those two things happen in time. =
Only the DF PE can forward traffic. A non-DF can never forward traffic or t=
here will be risk of duplicate packets.


2.      Will all the nodes in backup mode forward the packet before DF elec=
tion?

[JORGE] Only the new DF can forward.



3. If they forward, how is duplicate packets handled, in this case?
[JORGE] see above.

My two cents..

Thanks.
Jorge



From:BESS <bess-bounces@ietf.org<mailto:bess-bounces@ietf.org>> on behalf o=
f Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com<mailto:jaikumar=
.somasundaram@ericsson..com>>
Date: Thursday, October 4, 2018 at 10:03 AM
To: "bess@ietf.org<mailto:bess@ietf.org>" <bess@ietf.org<mailto:bess@ietf.o=
rg>>
Cc: Jiang He <jiang.he@ericsson.com<mailto:jiang.he@ericsson.com>>, P Muthu=
 Arul Mozhi <p.muthu.arul.mozhi@ericsson.com<mailto:p.muthu.arul.mozhi@eric=
sson.com>>
Subject: [bess] EVPN MH: Backup node behavior in Primary Path Failure


Hello Everyone,

Sorry if it is a duplicate. I repost this query as I did not receive any re=
sponse yet.
(I was wondering if this mail already reached the group or not)


I have a question on Primary PE encountering a failure in EVPN multihoming

in single active mode.



RFC7432, section 14.1.1:

<snip>

   If there is more than one backup PE for a given ES, the remote PE

   MUST use the primary PE's withdrawal of its set of Ethernet A-D per

   ES routes as a trigger to start flooding traffic for the associated

   MAC addresses (as long as flooding of unknown unicast packets is

   administratively allowed), as it is not possible to select a single

   backup PE.

</snip>



Questions:

1. Will the node in backup mode forward the packet to CE?

2. Will all the nodes in backup mode forward the packet before DF election?

3. If they forward, how is duplicate packets handled, in this case?



Please help me anwere these questions.



Thanks & Regards

Jaikumar S


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</head>
<body lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Jorge,<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">The other possibility =
for this case is for each PE to advertise a Per EVI Ethernet A-D route for =
only those EVIs for which it would become DF if the current DF were to fail=
.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Yours Irrespectively,<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">John<o:p></o:p></span>=
</p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> BESS &lt;bess-bounces@ietf.org&gt; <b>O=
n Behalf Of </b>
Rabadan, Jorge (Nokia - US/Mountain View)<br>
<b>Sent:</b> Tuesday, October 16, 2018 4:56 AM<br>
<b>To:</b> Zhuangshunwan &lt;zhuangshunwan@huawei.com&gt;; Muthu Arul Mozhi=
 Perumal &lt;muthu.arul@gmail.com&gt;<br>
<b>Cc:</b> jiang.he@ericsson.com; p.muthu.arul.mozhi@ericsson.com; jaikumar=
.somasundaram@ericsson.com; bess@ietf.org<br>
<b>Subject:</b> Re: [bess] EVPN MH: Backup node behavior in Primary Path Fa=
ilure<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"font-famil=
y:&quot;HelveticaNeue&quot;,serif;color:#333333">Hi,</span><span style=3D"f=
ont-size:12.0pt;line-height:150%;font-family:&quot;HelveticaNeue&quot;,seri=
f;color:#333333"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"font-famil=
y:&quot;HelveticaNeue&quot;,serif;color:#333333"><o:p>&nbsp;</o:p></span></=
p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"font-famil=
y:&quot;HelveticaNeue&quot;,serif;color:#333333">RFC7432 explains that if t=
here are more than 2 PEs in the ES, then, upon receiving the AD route withd=
rawals, the remote PE will flood. That is, it&#8217;ll
 flush the MACs and flood since it does not know who the new DF is, and the=
re is no backup for a given MAC.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"font-famil=
y:&quot;HelveticaNeue&quot;,serif;color:#333333"><o:p>&nbsp;</o:p></span></=
p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"font-famil=
y:&quot;HelveticaNeue&quot;,serif;color:#333333">So yes, with more than 2 P=
Es, there is no backup per se. Note that, even if we had the BDF indication=
, upon an ES failure the remote PE will start receiving
 MAC/IP route withdrawals. Hence unless the re advertisements of the MACs s=
tart coming immediately, the BDF indication may not avoid flooding anyway..=
 We can add the P and B bits here too, but they may not be as useful as in =
RFC8214.<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"font-famil=
y:&quot;HelveticaNeue&quot;,serif;color:#333333"><o:p>&nbsp;</o:p></span></=
p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"font-famil=
y:&quot;HelveticaNeue&quot;,serif;color:#333333">Thanks,<o:p></o:p></span><=
/p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"font-famil=
y:&quot;HelveticaNeue&quot;,serif;color:#333333">Jorge<o:p></o:p></span></p=
>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"font-famil=
y:&quot;HelveticaNeue&quot;,serif;color:#333333"><o:p>&nbsp;</o:p></span></=
p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"font-famil=
y:&quot;HelveticaNeue&quot;,serif;color:#333333"><o:p>&nbsp;</o:p></span></=
p>
</div>
</div>
<div>
<div class=3D"MsoNormal" align=3D"center" style=3D"text-align:center;line-h=
eight:150%">
<span style=3D"font-family:&quot;HelveticaNeue&quot;,serif;color:#333333">
<hr size=3D"3" width=3D"98%" align=3D"center">
</span></div>
<div id=3D"divRplyFwdMsg">
<p class=3D"MsoNormal" style=3D"line-height:150%"><b><span style=3D"color:b=
lack">From:</span></b><span style=3D"color:black"> Zhuangshunwan &lt;<a hre=
f=3D"mailto:zhuangshunwan@huawei.com">zhuangshunwan@huawei.com</a>&gt;<br>
<b>Sent:</b> Tuesday, October 16, 2018 00:19<br>
<b>To:</b> Rabadan, Jorge (Nokia - US/Mountain View); Muthu Arul Mozhi Peru=
mal<br>
<b>Cc:</b> <a href=3D"mailto:jiang.he@ericsson.com">jiang.he@ericsson.com</=
a>; <a href=3D"mailto:p.muthu.arul.mozhi@ericsson.com">
p.muthu.arul.mozhi@ericsson.com</a>; <a href=3D"mailto:bess@ietf.org">bess@=
ietf.org</a>;
<a href=3D"mailto:jaikumar.somasundaram@ericsson.com">jaikumar.somasundaram=
@ericsson.com</a><br>
<b>Subject:</b> RE: [bess] EVPN MH: Backup node behavior in Primary Path Fa=
ilure <o:p>
</o:p></span></p>
<div>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:blac=
k">&nbsp;<o:p></o:p></span></p>
</div>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">Hi Jorge,</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">&nbsp;</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">8.4.&nbsp; Aliasing and Backup Path of RFC7432 says:</span><span style=
=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">&nbsp;</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">&lt;snip&gt;</span><span style=3D"color:#333333"><o:p></o:p></span></p=
>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">.&nbsp;&nbsp; The backup path is a closely related function, but it is=
 used in</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">.&nbsp;&nbsp; Single-Active redundancy mode.&nbsp; In this case, a PE =
also advertises</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">.&nbsp;&nbsp; that it has reachability to a given EVI/ES using the sam=
e combination</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">.&nbsp;&nbsp; of Ethernet A-D per EVI route and Ethernet A-D per ES ro=
ute as</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">.&nbsp;&nbsp; discussed above, but with the &quot;Single-Active&quot; =
bit in the flags of the</span><span style=3D"color:#333333"><o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">.&nbsp;&nbsp; ESI Label extended community set to 1.&nbsp; A remote PE=
 that receives a</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">.&nbsp;&nbsp; MAC/IP Advertisement route with a non-reserved ESI SHOUL=
D consider</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">.&nbsp;&nbsp; the advertised MAC address to be reachable via any PE th=
at has</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">.&nbsp;&nbsp; advertised this combination of Ethernet A-D routes, and =
it SHOULD</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">.&nbsp;&nbsp; install a backup path for that MAC address.</span><span =
style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">&lt;snip&gt;&nbsp;&nbsp;
</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">&nbsp;</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">Actually, do we think that the function described in this section only=
 works when there are only 2 PEs in one ES?</span><span style=3D"color:#333=
333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">When there are more than 2 PEs in one ES, it cannot work unless RFC743=
2 also introduce the BDF election function defined in RFC8214.</span><span =
style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">&nbsp;</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">Regards,</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">Shunwan</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">&nbsp;</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"line-height:150%"><b><span style=3D"color:#=
333333">From:</span></b><span style=3D"color:#333333"> BESS [<a href=3D"mai=
lto:bess-bounces@ietf.org">mailto:bess-bounces@ietf.org</a>]
<b>On Behalf Of</b>Rabadan, Jorge (Nokia - US/Mountain View)<br>
<b>Sent:</b> Friday, October 05, 2018 2:01 PM<br>
<b>To:</b> Muthu Arul Mozhi Perumal &lt;<a href=3D"mailto:muthu.arul@gmail.=
com">muthu.arul@gmail.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:jiang.he@ericsson.com">jiang.he@ericsson.com</=
a>; <a href=3D"mailto:p.muthu.arul.mozhi@ericsson.com">
p.muthu.arul.mozhi@ericsson.com</a>; <a href=3D"mailto:bess@ietf.org">bess@=
ietf.org</a>;
<a href=3D"mailto:jaikumar.somasundaram@ericsson.com">jaikumar.somasundaram=
@ericsson.com</a><br>
<b>Subject:</b> Re: [bess] EVPN MH: Backup node behavior in Primary Path Fa=
ilure<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#333=
333">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"font-size:=
10.5pt;line-height:150%;font-family:Consolas;color:#333333">That should be =
true only in RFC8214. That&#8217;s my point&#8230;</span><span style=3D"col=
or:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"font-size:=
10.5pt;line-height:150%;font-family:Consolas;color:#333333">&nbsp;</span><s=
pan style=3D"color:#333333"><o:p></o:p></span></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:.5in;line-height:150%"><b><span=
 style=3D"font-size:12.0pt;line-height:150%;color:black">From:</span></b><s=
pan style=3D"font-size:12.0pt;line-height:150%;color:black">Muthu Arul Mozh=
i Perumal &lt;<a href=3D"mailto:muthu.arul@gmail.com">muthu.arul@gmail.com<=
/a>&gt;<br>
<b>Date: </b>Friday, October 5, 2018 at 5:47 AM<br>
<b>To: </b>&quot;Rabadan, Jorge (Nokia - US/Mountain View)&quot; &lt;<a hre=
f=3D"mailto:jorge.rabadan@nokia.com">jorge.rabadan@nokia.com</a>&gt;<br>
<b>Cc: </b>&quot;<a href=3D"mailto:jaikumar.somasundaram@ericsson.com">jaik=
umar.somasundaram@ericsson.com</a>&quot; &lt;<a href=3D"mailto:jaikumar.som=
asundaram@ericsson.com">jaikumar.somasundaram@ericsson.com</a>&gt;, &quot;<=
a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>&quot; &lt;<a href=3D"mail=
to:bess@ietf.org">bess@ietf.org</a>&gt;,
 &quot;<a href=3D"mailto:jiang.he@ericsson.com">jiang.he@ericsson.com</a>&q=
uot; &lt;<a href=3D"mailto:jiang.he@ericsson.com">jiang.he@ericsson.com</a>=
&gt;, &quot;<a href=3D"mailto:p.muthu.arul.mozhi@ericsson.com">p.muthu.arul=
..mozhi@ericsson.com</a>&quot; &lt;<a href=3D"mailto:p.muthu.arul.mozhi@eri=
csson.com">p.muthu.arul.mozhi@ericsson.com</a>&gt;<br>
<b>Subject: </b>Re: [bess] EVPN MH: Backup node behavior in Primary Path Fa=
ilure</span><span style=3D"color:#333333"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in;line-height:150%"><span st=
yle=3D"color:#333333">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in;line-height:150%"><span st=
yle=3D"font-family:&quot;Courier New&quot;;color:#333333">Thanks, Jorge.</s=
pan><span style=3D"color:#333333"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in;line-height:150%"><span st=
yle=3D"color:#333333">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in;line-height:150%"><span st=
yle=3D"font-family:&quot;Courier New&quot;;color:#333333">In EVPN single-ac=
tive dual-homing or EVPN VPWS single-active multi-homing, when other PEs re=
alize that the DF is dead, they all need to re-run
 the DF election for sure. However, traffic recovery need not wait until th=
e DF election gets over electing a new DF..it only requires the other PEs a=
nd the backup to realize the primary/DF is dead and start forward. That's m=
y point..</span><span style=3D"color:#333333"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in;line-height:150%"><span st=
yle=3D"color:#333333">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in;line-height:150%"><span st=
yle=3D"font-family:&quot;Courier New&quot;;color:#333333">Regards,</span><s=
pan style=3D"color:#333333"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in;line-height:150%"><span st=
yle=3D"font-family:&quot;Courier New&quot;;color:#333333">Muthu</span><span=
 style=3D"color:#333333"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in;line-height:150%"><span st=
yle=3D"color:#333333">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in;line-height:150%"><span st=
yle=3D"color:#333333">On Fri, Oct 5, 2018 at 1:30 AM Rabadan, Jorge (Nokia =
- US/Mountain View) &lt;<a href=3D"mailto:jorge.rabadan@nokia.com">jorge.ra=
badan@nokia.com</a>&gt; wrote:<o:p></o:p></span></p>
</div>
<blockquote style=3D"border:none;border-left:solid #CCCCCC 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in;line-height:150%"><span st=
yle=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;color:#333333=
">Muthu,</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in;line-height:150%"><span st=
yle=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;color:#333333=
">&nbsp;</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in;line-height:150%"><span st=
yle=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;color:#333333=
">&nbsp;</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:1.0in;line-height:150%"><b><spa=
n style=3D"font-size:12.0pt;line-height:150%;color:black">From:</span></b><=
span style=3D"font-size:12.0pt;line-height:150%;color:black">Muthu Arul Moz=
hi Perumal &lt;<a href=3D"mailto:muthu.arul@gmail.com" target=3D"_blank">mu=
thu.arul@gmail.com</a>&gt;<br>
<b>Date: </b>Thursday, October 4, 2018 at 5:37 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>&quot;<a href=3D"mailto:jaikumar.somasundaram@ericsson.com" targ=
et=3D"_blank">jaikumar.somasundaram@ericsson.com</a>&quot; &lt;<a href=3D"m=
ailto:jaikumar.somasundaram@ericsson.com" target=3D"_blank">jaikumar.somasu=
ndaram@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.org</a>&g=
t;, &quot;<a href=3D"mailto:jiang.he@ericsson.com" target=3D"_blank">jiang.=
he@ericsson.com</a>&quot; &lt;<a href=3D"mailto:jiang.he@ericsson.com" targ=
et=3D"_blank">jiang.he@ericsson.com</a>&gt;, &quot;<a href=3D"mailto:p.muth=
u.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@ericsson.co=
m</a>&quot;
 &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] EVPN MH: Backup node behavior in Primary Path Fa=
ilure</span><span style=3D"color:#333333"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in;line-height:150%"><span s=
tyle=3D"color:#333333">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in;line-height:150%"><span s=
tyle=3D"font-size:12.0pt;line-height:150%;font-family:&quot;Arial&quot;,san=
s-serif;color:#333333">Thanks, Jorge. This is inline with my thinking. So, =
in single-active multihoming, once the primary is
 dead we don't need to wait for the DF election to happen for the backup (o=
r some other PE in the ES) to become active and start forwarding traffic ov=
er the ES, instead it only requires the remote PEs and backup to realize th=
at the primary is dead (thru' NH
 tracking / BFD) and start forwarding over the ES, right?</span><span style=
=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in;line-height:150%"><span st=
yle=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;color:#333333=
">[JORGE] When the other PEs in the ES realize the DF is dead, they need to=
 remove the dead PE from the candidate
 list and run DF Election. You may optimize things if you only have two PEs=
 in the ES (such as skip the timer) but if you have more than 2 PEs in the =
ES, there is really no concept of backup PE in RFC7432, but simply the othe=
r PEs are non-DF. However, the concept
 of backup PE in an ES with more than two PEs is specified in RFC8214, wher=
e all the PEs in the ES not only elect a DF but also a backup DF, and signa=
l this backup condition in the AD per-EVI routes. Note this is not there in=
 RFC7432.</span><span style=3D"color:#333333"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in;line-height:150%"><span s=
tyle=3D"font-size:12.0pt;line-height:150%;font-family:&quot;Arial&quot;,san=
s-serif;color:#333333">&nbsp;</span><span style=3D"color:#333333"><o:p></o:=
p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in;line-height:150%"><span s=
tyle=3D"font-size:12.0pt;line-height:150%;font-family:&quot;Arial&quot;,san=
s-serif;color:#333333">Regards,</span><span style=3D"color:#333333"><o:p></=
o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in;line-height:150%"><span s=
tyle=3D"font-size:12.0pt;line-height:150%;font-family:&quot;Arial&quot;,san=
s-serif;color:#333333">Muthu</span><span style=3D"color:#333333"><o:p></o:p=
></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in;line-height:150%"><span s=
tyle=3D"font-size:12.0pt;line-height:150%;font-family:&quot;Arial&quot;,san=
s-serif;color:#333333">&nbsp;</span><span style=3D"color:#333333"><o:p></o:=
p></span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in;line-height:150%"><span s=
tyle=3D"color:#333333">On Thu, Oct 4, 2018 at 8:10 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:<o:p></o:p></span></p>
</div>
<blockquote style=3D"border:none;border-left:solid #CCCCCC 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in;line-height:150%"><span s=
tyle=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;color:#33333=
3">Muthu,</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in;line-height:150%"><span s=
tyle=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;color:#33333=
3">&nbsp;</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in;line-height:150%"><span s=
tyle=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;color:#33333=
3">About this:</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in;line-height:150%"><span s=
tyle=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;color:#33333=
3">&nbsp;</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.5in;line-height:150%"><span s=
tyle=3D"font-size:12.0pt;line-height:150%;font-family:&quot;Arial&quot;,san=
s-serif;color:#333333">Suppose we have a full mesh of iBGP sessions b/w the=
 PEs, then who would withdraw the routes if the
 primary PE / DF itself fails? Instead, the BGP session would timeout causi=
ng the primary PE's neighbors to flush out the A-D routes received from the=
 primary PE, right? This can take several seconds, isn't it?</span><span st=
yle=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in;line-height:150%"><span s=
tyle=3D"font-size:12.0pt;line-height:150%;font-family:&quot;Arial&quot;,san=
s-serif;color:#333333">&nbsp;</span><span style=3D"color:#333333"><o:p></o:=
p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in;line-height:150%"><span s=
tyle=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;color:#33333=
3">No, not in the implementations I know of. Next Hop tracking will immedia=
tely detect that the PE is not in the
 network anymore and the routes will be invalidated. You can also bootstrap=
 the BGP sessions to BFD.
</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in;line-height:150%"><span s=
tyle=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;color:#33333=
3">But that has nothing to do with EVPN!.. it&#8217;s regular BGP.</span><s=
pan style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in;line-height:150%"><span s=
tyle=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;color:#33333=
3">&nbsp;</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in;line-height:150%"><span s=
tyle=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;color:#33333=
3">Thx</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in;line-height:150%"><span s=
tyle=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;color:#33333=
3">Jorge</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in;line-height:150%"><span s=
tyle=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;color:#33333=
3">&nbsp;</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:1.5in;line-height:150%"><b><spa=
n style=3D"font-size:12.0pt;line-height:150%;color:black">From:</span></b><=
span style=3D"font-size:12.0pt;line-height:150%;color:black">Muthu Arul Moz=
hi Perumal &lt;<a href=3D"mailto:muthu.arul@gmail.com" target=3D"_blank">mu=
thu.arul@gmail.com</a>&gt;<br>
<b>Date: </b>Thursday, October 4, 2018 at 1:14 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>&quot;<a href=3D"mailto:jaikumar.somasundaram@ericsson.com" targ=
et=3D"_blank">jaikumar.somasundaram@ericsson.com</a>&quot; &lt;<a href=3D"m=
ailto:jaikumar.somasundaram@ericsson.com" target=3D"_blank">jaikumar.somasu=
ndaram@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.org</a>&g=
t;, &quot;<a href=3D"mailto:jiang.he@ericsson.com" target=3D"_blank">jiang.=
he@ericsson.com</a>&quot; &lt;<a href=3D"mailto:jiang.he@ericsson.com" targ=
et=3D"_blank">jiang.he@ericsson.com</a>&gt;, &quot;<a href=3D"mailto:p.muth=
u.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@ericsson.co=
m</a>&quot;
 &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] EVPN MH: Backup node behavior in Primary Path Fa=
ilure</span><span style=3D"color:#333333"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.5in;line-height:150%"><span s=
tyle=3D"color:#333333">&nbsp;<o:p></o:p></span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.5in;line-height:150%"><span s=
tyle=3D"font-size:12.0pt;line-height:150%;font-family:&quot;Arial&quot;,san=
s-serif;color:#333333">Please see inline..</span><span style=3D"color:#3333=
33"><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:1.5in;line-height:150%"><span s=
tyle=3D"color:#333333">&nbsp;<o:p></o:p></span></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.5in;line-height:150%"><span s=
tyle=3D"color:#333333">On Thu, Oct 4, 2018 at 3:33 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:<o:p></o:p></span></p>
</div>
<blockquote style=3D"border:none;border-left:solid #CCCCCC 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.5in;line-height:150%"><span s=
tyle=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;color:#33333=
3">In-line.</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.5in;line-height:150%"><span s=
tyle=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;color:#33333=
3">&nbsp;</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.5in;line-height:150%"><span s=
tyle=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;color:#33333=
3">Thx</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.5in;line-height:150%"><span s=
tyle=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;color:#33333=
3">Jorge</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.5in;line-height:150%"><span s=
tyle=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;color:#33333=
3">&nbsp;</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:2.0in;line-height:150%"><b><spa=
n style=3D"font-size:12.0pt;line-height:150%;color:black">From:</span></b><=
span style=3D"font-size:12.0pt;line-height:150%;color:black">Jaikumar Somas=
undaram &lt;<a href=3D"mailto:jaikumar.somasundaram@ericsson.com" target=3D=
"_blank">jaikumar.somasundaram@ericsson.com</a>&gt;<br>
<b>Date: </b>Thursday, October 4, 2018 at 11:28 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;, &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">b=
ess@ietf.org</a>&gt;<br>
<b>Cc: </b>Jiang He &lt;<a href=3D"mailto:jiang.he@ericsson.com" target=3D"=
_blank">jiang.he@ericsson.com</a>&gt;, P Muthu Arul Mozhi &lt;<a href=3D"ma=
ilto:p.muthu.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@=
ericsson.com</a>&gt;<br>
<b>Subject: </b>RE: [bess] EVPN MH: Backup node behavior in Primary Path Fa=
ilure</span><span style=3D"color:#333333"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in;line-height:150%"><span s=
tyle=3D"color:#333333">&nbsp;<o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in;line-height:150%"><span s=
tyle=3D"color:#0070C0">Thanks Jorge for the quick reply.</span><span style=
=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in;line-height:150%"><span s=
tyle=3D"color:#0070C0">Please find further question below.</span><span styl=
e=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in;line-height:150%"><span s=
tyle=3D"color:#333333">&nbsp;<o:p></o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:2.0in;line-height:150%"><b><spa=
n style=3D"color:#333333">From:</span></b><span style=3D"color:#333333"> Ra=
badan, Jorge (Nokia - US/Mountain View) &lt;<a href=3D"mailto:jorge.rabadan=
@nokia.com" target=3D"_blank">jorge.rabadan@nokia.com</a>&gt;<br>
<b>Sent:</b> Thursday, October 4, 2018 1:52 PM<br>
<b>To:</b> Jaikumar Somasundaram &lt;<a href=3D"mailto:jaikumar.somasundara=
m@ericsson.com" target=3D"_blank">jaikumar.somasundaram@ericsson.com</a>&gt=
;;<a href=3D"mailto:bess@ietf.org" target=3D"_blank">bess@ietf.org</a><br>
<b>Cc:</b> Jiang He &lt;<a href=3D"mailto:jiang.he@ericsson.com" target=3D"=
_blank">jiang.he@ericsson.com</a>&gt;; P Muthu Arul Mozhi &lt;<a href=3D"ma=
ilto:p.muthu.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@=
ericsson.com</a>&gt;<br>
<b>Subject:</b> Re: [bess] EVPN MH: Backup node behavior in Primary Path Fa=
ilure<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in;line-height:150%"><span s=
tyle=3D"color:#333333">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in;line-height:150%"><span s=
tyle=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;color:#33333=
3">Hi,</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in;line-height:150%"><span s=
tyle=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;color:#33333=
3">&nbsp;</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.5in;line-height:150%">
<span style=3D"color:#333333">Questions:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.75in;line-height:150%"><span =
style=3D"color:#333333">1.</span><span style=3D"font-size:7.0pt;line-height=
:150%;font-family:&quot;Times New Roman&quot;,serif;color:#333333">&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style=3D"color:#333333">Will the n=
ode in
 backup mode forward the packet to CE?<o:p></o:p></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in;line-height:150%">
<span style=3D"color:#333333">[JORGE] as soon as it becomes DF it can forwa=
rd packets to the CE. The backup node will have to run DF election upon the=
 ES route withdrawal from the primary. If AC-DF is enabled, it can also rea=
ct to the withdrawal of AD routes
 from the primary PE.<o:p></o:p></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in;line-height:150%">
<b><i><span style=3D"color:#333333">[Jai] Does that mean if any packet come=
s to a node that is still in the backup mode will get dropped, before the n=
ew DF election is complete? Why cant this be used as FRR? Or what is the us=
e case of having backup node(s)?</span></i></b><span style=3D"color:#333333=
"><o:p></o:p></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:1.5in;line-height:150%">
<b><span style=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;co=
lor:#333333">[JORGE2] when the primary node fails, ES and AD routes are wit=
hdrawn.</span></b><span style=3D"color:#333333"><o:p></o:p></span></p>
</div>
</div>
</blockquote>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.5in;line-height:150%"><span s=
tyle=3D"font-size:12.0pt;line-height:150%;font-family:&quot;Arial&quot;,san=
s-serif;color:#333333">Suppose we have a full mesh of iBGP sessions b/w the=
 PEs, then who would withdraw the routes if the
 primary PE / DF itself fails? Instead, the BGP session would timeout causi=
ng the primary PE's neighbors to flush out the A-D routes received from the=
 primary PE, right? This can take several seconds, isn't it?</span><span st=
yle=3D"color:#333333"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.5in;line-height:150%"><span s=
tyle=3D"font-size:12.0pt;line-height:150%;font-family:&quot;Arial&quot;,san=
s-serif;color:#333333">&nbsp;</span><span style=3D"color:#333333"><o:p></o:=
p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.5in;line-height:150%"><span s=
tyle=3D"font-size:12.0pt;line-height:150%;font-family:&quot;Arial&quot;,san=
s-serif;color:#333333">Regards,</span><span style=3D"color:#333333"><o:p></=
o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.5in;line-height:150%"><span s=
tyle=3D"font-size:12.0pt;line-height:150%;font-family:&quot;Arial&quot;,san=
s-serif;color:#333333">Muthu</span><span style=3D"color:#333333"><o:p></o:p=
></span></p>
</div>
</div>
<blockquote style=3D"border:none;border-left:solid #CCCCCC 1.0pt;padding:0i=
n 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-=
bottom:5.0pt">
<div>
<div>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:1.5in;line-height:150%">
<b><span style=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;co=
lor:#333333">The AD route withdrawal is an indication for remote nodes that=
 they have to send traffic to the backup (for a given MAC) or to flush the =
MACs if there are more than 2 PEs
 in the ES. Around the same time or maybe earlier, the ES route withdrawal =
will make the backup PE take over as DF. So the overall convergence time wi=
ll depend on how/when those two things happen in time. Only the DF PE can f=
orward traffic. A non-DF can never
 forward traffic or there will be risk of duplicate packets.</span></b><spa=
n style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in;line-height:150%">
<span style=3D"color:#333333">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.75in;line-height:150%"><span =
style=3D"color:#333333">2.</span><span style=3D"font-size:7.0pt;line-height=
:150%;font-family:&quot;Times New Roman&quot;,serif;color:#333333">&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style=3D"color:#333333">Will all t=
he nodes
 in backup mode forward the packet before DF election?<o:p></o:p></span></p=
>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in;line-height:150%">
<span style=3D"color:#333333">[JORGE] Only the new DF can forward.<o:p></o:=
p></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in;line-height:150%">
<span style=3D"color:#333333">&nbsp;<o:p></o:p></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.5in;line-height:150%">
<span style=3D"color:#333333">3. If they forward, how is duplicate packets =
handled, in this case?<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in;line-height:150%"><span s=
tyle=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;color:#33333=
3">[JORGE] see above.</span><span style=3D"color:#333333"><o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in;line-height:150%"><span s=
tyle=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;color:#33333=
3">&nbsp;</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in;line-height:150%"><span s=
tyle=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;color:#33333=
3">My two cents..</span><span style=3D"color:#333333"><o:p></o:p></span></p=
>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in;line-height:150%"><span s=
tyle=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;color:#33333=
3">&nbsp;</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in;line-height:150%"><span s=
tyle=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;color:#33333=
3">Thanks.</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in;line-height:150%"><span s=
tyle=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;color:#33333=
3">Jorge</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in;line-height:150%"><span s=
tyle=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;color:#33333=
3">&nbsp;</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in;line-height:150%"><span s=
tyle=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;color:#33333=
3">&nbsp;</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in;line-height:150%"><span s=
tyle=3D"font-size:10.5pt;line-height:150%;font-family:Consolas;color:#33333=
3">&nbsp;</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:2.0in;line-height:150%"><b><spa=
n style=3D"font-size:12.0pt;line-height:150%;color:black">From:</span></b><=
span style=3D"font-size:12.0pt;line-height:150%;color:black">BESS &lt;<a hr=
ef=3D"mailto:bess-bounces@ietf.org" target=3D"_blank">bess-bounces@ietf.org=
</a>&gt;
 on behalf of Jaikumar Somasundaram &lt;<a href=3D"mailto:jaikumar.somasund=
aram@ericsson..com" target=3D"_blank">jaikumar.somasundaram@ericsson.com</a=
>&gt;<br>
<b>Date: </b>Thursday, October 4, 2018 at 10:03 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>Jiang He &lt;<a href=3D"mailto:jiang.he@ericsson.com" target=3D"=
_blank">jiang.he@ericsson.com</a>&gt;, P Muthu Arul Mozhi &lt;<a href=3D"ma=
ilto:p.muthu.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@=
ericsson.com</a>&gt;<br>
<b>Subject: </b>[bess] EVPN MH: Backup node behavior in Primary Path Failur=
e</span><span style=3D"color:#333333"><o:p></o:p></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in;line-height:150%"><span s=
tyle=3D"color:#333333">&nbsp;<o:p></o:p></span></p>
</div>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in;line-height:150%">
<span style=3D"color:#333333">Hello Everyone,<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in;line-height:150%"><span s=
tyle=3D"color:#333333">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in;line-height:150%"><span s=
tyle=3D"color:#333333">Sorry if it is a duplicate. I repost this query as I=
 did not receive any response yet.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in;line-height:150%"><span s=
tyle=3D"color:#333333">(I was wondering if this mail already reached the gr=
oup or not)<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in;line-height:150%"><span s=
tyle=3D"color:#333333">&nbsp;<o:p></o:p></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in;line-height:150%">
<span style=3D"color:#333333">I have a question on Primary PE encountering =
a failure in EVPN multihoming<o:p></o:p></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in;line-height:150%">
<span style=3D"color:#333333">in single active mode.<o:p></o:p></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in;line-height:150%">
<span style=3D"color:#333333">&nbsp;<o:p></o:p></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in;line-height:150%">
<span style=3D"color:#333333">RFC7432, section 14.1.1:<o:p></o:p></span></p=
>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in;line-height:150%">
<span style=3D"font-family:&quot;Courier New&quot;;color:#333333">&lt;snip&=
gt;</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in;line-height:150%">
<span style=3D"font-family:&quot;Courier New&quot;;color:#333333">&nbsp;&nb=
sp; If there is more than one backup PE for a given ES, the remote PE</span=
><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in;line-height:150%">
<span style=3D"font-family:&quot;Courier New&quot;;color:#333333">&nbsp;&nb=
sp; MUST use the primary PE's withdrawal of its set of Ethernet A-D per</sp=
an><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in;line-height:150%">
<span style=3D"font-family:&quot;Courier New&quot;;color:#333333">&nbsp;&nb=
sp; ES routes as a trigger to start flooding traffic for the associated</sp=
an><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in;line-height:150%">
<span style=3D"font-family:&quot;Courier New&quot;;color:#333333">&nbsp;&nb=
sp; MAC addresses (as long as flooding of unknown unicast packets is</span>=
<span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in;line-height:150%">
<span style=3D"font-family:&quot;Courier New&quot;;color:#333333">&nbsp;&nb=
sp; administratively allowed), as it is not possible to select a single</sp=
an><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in;line-height:150%">
<span style=3D"font-family:&quot;Courier New&quot;;color:#333333">&nbsp;&nb=
sp; backup PE.</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in;line-height:150%">
<span style=3D"font-family:&quot;Courier New&quot;;color:#333333">&lt;/snip=
&gt;</span><span style=3D"color:#333333"><o:p></o:p></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in;line-height:150%">
<span style=3D"color:#333333">&nbsp;<o:p></o:p></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in;line-height:150%">
<span style=3D"color:#333333">Questions:<o:p></o:p></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in;line-height:150%">
<span style=3D"color:#333333">1. Will the node in backup mode forward the p=
acket to CE?<o:p></o:p></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in;line-height:150%">
<span style=3D"color:#333333">2. Will all the nodes in backup mode forward =
the packet before DF election?<o:p></o:p></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in;line-height:150%">
<span style=3D"color:#333333">3. If they forward, how is duplicate packets =
handled, in this case?<o:p></o:p></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in;line-height:150%">
<span style=3D"color:#333333">&nbsp;<o:p></o:p></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in;line-height:150%">
<span style=3D"color:#333333">Please help me anwere these questions.<o:p></=
o:p></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in;line-height:150%">
<span style=3D"color:#333333">&nbsp;<o:p></o:p></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in;line-height:150%">
<span style=3D"color:#333333">Thanks &amp; Regards<o:p></o:p></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in;line-height:150%">
<span style=3D"color:#333333">Jaikumar S<o:p></o:p></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in;line-height:150%">
<span style=3D"color:#333333">&nbsp;<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:1.5in;line-height:150%"><span s=
tyle=3D"color:#333333">_______________________________________________<br>
BESS mailing list<br>
<a href=3D"mailto:BESS@ietf.org" target=3D"_blank">BESS@ietf.org</a><br>
<a href=3D"https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__www.ietf.=
org_mailman_listinfo_bess&amp;d=3DDwMF-g&amp;c=3DHAkYuh63rsuhr6Scbfh0UjBXeM=
K-ndb3voDTXcWzoCI&amp;r=3DCRB2tJiQePk0cT-h5LGhEWH-s_xXXup3HzvBSMRj5VE&amp;m=
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ajbDMQbGlP8jcMoIyVNdt6A&amp;e=3D" target=3D"_blank">https://www.ietf.org/ma=
ilman/listinfo/bess</a><o:p></o:p></span></p>
</blockquote>
</div>
</div>
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</div>
</blockquote>
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</div>
</blockquote>
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From: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>
To: John E Drake <jdrake@juniper.net>, Zhuangshunwan <zhuangshunwan@huawei.com>, Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
CC: "jiang.he@ericsson.com" <jiang.he@ericsson.com>, "p.muthu.arul.mozhi@ericsson.com" <p.muthu.arul.mozhi@ericsson.com>, "jaikumar.somasundaram@ericsson.com" <jaikumar.somasundaram@ericsson.com>, "bess@ietf.org" <bess@ietf.org>
Thread-Topic: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/4I7YbqLvxNPYYsDcYtH3hkIhRls>
Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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Content-Type: text/plain; charset="Windows-1252"
Content-Transfer-Encoding: quoted-printable

I agree John.
Thanks,
Jorge

________________________________
From: John E Drake <jdrake@juniper.net>
Sent: Tuesday, October 16, 2018 07:43
To: Rabadan, Jorge (Nokia - US/Mountain View); Zhuangshunwan; Muthu Arul Mo=
zhi Perumal
Cc: jiang.he@ericsson.com; p.muthu.arul.mozhi@ericsson.com; jaikumar.somasu=
ndaram@ericsson.com; bess@ietf.org
Subject: RE: [bess] EVPN MH: Backup node behavior in Primary Path Failure

Jorge,

The other possibility for this case is for each PE to advertise a Per EVI E=
thernet A-D route for only those EVIs for which it would become DF if the c=
urrent DF were to fail.

Yours Irrespectively,

John

From: BESS <bess-bounces@ietf.org> On Behalf Of Rabadan, Jorge (Nokia - US/=
Mountain View)
Sent: Tuesday, October 16, 2018 4:56 AM
To: Zhuangshunwan <zhuangshunwan@huawei.com>; Muthu Arul Mozhi Perumal <mut=
hu.arul@gmail.com>
Cc: jiang.he@ericsson.com; p.muthu.arul.mozhi@ericsson.com; jaikumar.somasu=
ndaram@ericsson.com; bess@ietf.org
Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure

Hi,

RFC7432 explains that if there are more than 2 PEs in the ES, then, upon re=
ceiving the AD route withdrawals, the remote PE will flood. That is, it=92l=
l flush the MACs and flood since it does not know who the new DF is, and th=
ere is no backup for a given MAC.

So yes, with more than 2 PEs, there is no backup per se. Note that, even if=
 we had the BDF indication, upon an ES failure the remote PE will start rec=
eiving MAC/IP route withdrawals. Hence unless the re advertisements of the =
MACs start coming immediately, the BDF indication may not avoid flooding an=
yway.. We can add the P and B bits here too, but they may not be as useful =
as in RFC8214.

Thanks,
Jorge


________________________________
From: Zhuangshunwan <zhuangshunwan@huawei.com<mailto:zhuangshunwan@huawei.c=
om>>
Sent: Tuesday, October 16, 2018 00:19
To: Rabadan, Jorge (Nokia - US/Mountain View); Muthu Arul Mozhi Perumal
Cc: jiang.he@ericsson.com<mailto:jiang.he@ericsson.com>; p.muthu.arul.mozhi=
@ericsson.com<mailto:p.muthu.arul.mozhi@ericsson.com>; bess@ietf.org<mailto=
:bess@ietf.org>;jaikumar.somasundaram@ericsson.com<mailto:jaikumar.somasund=
aram@ericsson.com>
Subject: RE: [bess] EVPN MH: Backup node behavior in Primary Path Failure

Hi Jorge,

8.4.  Aliasing and Backup Path of RFC7432 says:

<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>

Actually, do we think that the function described in this section only work=
s when there are only 2 PEs in one ES?
When there are more than 2 PEs in one ES, it cannot work unless RFC7432 als=
o introduce the BDF election function defined in RFC8214.

Regards,
Shunwan

From: BESS [mailto:bess-bounces@ietf.org]On Behalf OfRabadan, Jorge (Nokia =
- US/Mountain View)
Sent: Friday, October 05, 2018 2:01 PM
To: Muthu Arul Mozhi Perumal <muthu.arul@gmail.com<mailto:muthu.arul@gmail.=
com>>
Cc: jiang.he@ericsson.com<mailto:jiang.he@ericsson.com>; p.muthu.arul.mozhi=
@ericsson.com<mailto:p.muthu.arul.mozhi@ericsson.com>; bess@ietf.org<mailto=
:bess@ietf.org>;jaikumar.somasundaram@ericsson.com<mailto:jaikumar.somasund=
aram@ericsson.com>
Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure

That should be true only in RFC8214. That=92s my point=85

From:Muthu Arul Mozhi Perumal <muthu.arul@gmail.com<mailto:muthu.arul@gmail=
.com>>
Date: Friday, October 5, 2018 at 5:47 AM
To: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com<ma=
ilto:jorge.rabadan@nokia.com>>
Cc: "jaikumar.somasundaram@ericsson.com<mailto:jaikumar.somasundaram@ericss=
on.com>" <jaikumar.somasundaram@ericsson.com<mailto:jaikumar.somasundaram@e=
ricsson.com>>, "bess@ietf.org<mailto:bess@ietf.org>" <bess@ietf.org<mailto:=
bess@ietf.org>>, "jiang.he@ericsson.com<mailto:jiang.he@ericsson.com>" <jia=
ng.he@ericsson.com<mailto:jiang.he@ericsson.com>>, "p.muthu.arul..mozhi@eri=
csson.com<mailto:p.muthu.arul.mozhi@ericsson.com>" <p.muthu.arul.mozhi@eric=
sson.com<mailto:p.muthu.arul.mozhi@ericsson.com>>
Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure

Thanks, Jorge.

In EVPN single-active dual-homing or EVPN VPWS single-active multi-homing, =
when other PEs realize that the DF is dead, they all need to re-run the DF =
election for sure. However, traffic recovery need not wait until the DF ele=
ction gets over electing a new DF..it only requires the other PEs and the b=
ackup to realize the primary/DF is dead and start forward. That's my point.=
.

Regards,
Muthu

On Fri, Oct 5, 2018 at 1:30 AM Rabadan, Jorge (Nokia - US/Mountain View) <j=
orge.rabadan@nokia.com<mailto:jorge.rabadan@nokia.com>> wrote:
Muthu,


From:Muthu Arul Mozhi Perumal <muthu.arul@gmail.com<mailto:muthu.arul@gmail=
.com>>
Date: Thursday, October 4, 2018 at 5:37 PM
To: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com<ma=
ilto:jorge.rabadan@nokia.com>>
Cc: "jaikumar.somasundaram@ericsson.com<mailto:jaikumar.somasundaram@ericss=
on.com>" <jaikumar.somasundaram@ericsson.com<mailto:jaikumar.somasundaram@e=
ricsson.com>>, "bess@ietf.org<mailto:bess@ietf.org>" <bess@ietf.org<mailto:=
bess@ietf.org>>, "jiang.he@ericsson.com<mailto:jiang.he@ericsson.com>" <jia=
ng.he@ericsson.com<mailto:jiang.he@ericsson.com>>, "p.muthu.arul.mozhi@eric=
sson.com<mailto:p.muthu.arul.mozhi@ericsson.com>" <p..muthu.arul.mozhi@eric=
sson.com<mailto:p.muthu.arul.mozhi@ericsson.com>>
Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure

Thanks, Jorge. This is inline with my thinking. So, in single-active multih=
oming, once the primary is dead we don't need to wait for the DF election t=
o happen for the backup (or some other PE in the ES) to become active and s=
tart forwarding traffic over the ES, instead it only requires the remote PE=
s and backup to realize that the primary is dead (thru' NH tracking / BFD) =
and start forwarding over the ES, right?
[JORGE] When the other PEs in the ES realize the DF is dead, they need to r=
emove the dead PE from the candidate list and run DF Election. You may opti=
mize things if you only have two PEs in the ES (such as skip the timer) but=
 if you have more than 2 PEs in the ES, there is really no concept of backu=
p PE in RFC7432, but simply the other PEs are non-DF. However, the concept =
of backup PE in an ES with more than two PEs is specified in RFC8214, where=
 all the PEs in the ES not only elect a DF but also a backup DF, and signal=
 this backup condition in the AD per-EVI routes. Note this is not there in =
RFC7432.

Regards,
Muthu

On Thu, Oct 4, 2018 at 8:10 PM Rabadan, Jorge (Nokia - US/Mountain View) <j=
orge.rabadan@nokia.com<mailto:jorge.rabadan@nokia.com>> wrote:
Muthu,

About this:

Suppose we have a full mesh of iBGP sessions b/w the PEs, then who would wi=
thdraw the routes if the primary PE / DF itself fails? Instead, the BGP ses=
sion would timeout causing the primary PE's neighbors to flush out the A-D =
routes received from the primary PE, right? This can take several seconds, =
isn't it?

No, not in the implementations I know of. Next Hop tracking will immediatel=
y detect that the PE is not in the network anymore and the routes will be i=
nvalidated. You can also bootstrap the BGP sessions to BFD.
But that has nothing to do with EVPN!.. it=92s regular BGP.

Thx
Jorge

From:Muthu Arul Mozhi Perumal <muthu.arul@gmail.com<mailto:muthu.arul@gmail=
.com>>
Date: Thursday, October 4, 2018 at 1:14 PM
To: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com<ma=
ilto:jorge.rabadan@nokia.com>>
Cc: "jaikumar.somasundaram@ericsson.com<mailto:jaikumar.somasundaram@ericss=
on.com>" <jaikumar.somasundaram@ericsson.com<mailto:jaikumar.somasundaram@e=
ricsson.com>>, "bess@ietf.org<mailto:bess@ietf.org>" <bess@ietf.org<mailto:=
bess@ietf.org>>, "jiang.he@ericsson.com<mailto:jiang.he@ericsson.com>" <jia=
ng.he@ericsson.com<mailto:jiang.he@ericsson.com>>, "p.muthu.arul.mozhi@eric=
sson.com<mailto:p.muthu.arul.mozhi@ericsson.com>" <p..muthu.arul.mozhi@eric=
sson.com<mailto:p.muthu.arul.mozhi@ericsson.com>>
Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure

Please see inline..

On Thu, Oct 4, 2018 at 3:33 PM Rabadan, Jorge (Nokia - US/Mountain View) <j=
orge.rabadan@nokia.com<mailto:jorge.rabadan@nokia.com>> wrote:
In-line.

Thx
Jorge

From:Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com<mailto:jaiku=
mar.somasundaram@ericsson.com>>
Date: Thursday, October 4, 2018 at 11:28 AM
To: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com<ma=
ilto:jorge.rabadan@nokia.com>>, "bess@ietf.org<mailto:bess@ietf.org>" <bess=
@ietf.org<mailto:bess@ietf.org>>
Cc: Jiang He <jiang.he@ericsson.com<mailto:jiang.he@ericsson.com>>, P Muthu=
 Arul Mozhi <p.muthu.arul.mozhi@ericsson.com<mailto:p.muthu.arul.mozhi@eric=
sson.com>>
Subject: RE: [bess] EVPN MH: Backup node behavior in Primary Path Failure

Thanks Jorge for the quick reply.
Please find further question below.

From: Rabadan, Jorge (Nokia - US/Mountain View) <jorge.rabadan@nokia.com<ma=
ilto:jorge.rabadan@nokia.com>>
Sent: Thursday, October 4, 2018 1:52 PM
To: Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com<mailto:jaikum=
ar.somasundaram@ericsson.com>>;bess@ietf.org<mailto:bess@ietf.org>
Cc: Jiang He <jiang.he@ericsson.com<mailto:jiang.he@ericsson.com>>; P Muthu=
 Arul Mozhi <p.muthu.arul.mozhi@ericsson.com<mailto:p.muthu.arul.mozhi@eric=
sson.com>>
Subject: Re: [bess] EVPN MH: Backup node behavior in Primary Path Failure

Hi,


Questions:
1.      Will the node in backup mode forward the packet to CE?

[JORGE] as soon as it becomes DF it can forward packets to the CE. The back=
up node will have to run DF election upon the ES route withdrawal from the =
primary. If AC-DF is enabled, it can also react to the withdrawal of AD rou=
tes from the primary PE.

[Jai] Does that mean if any packet comes to a node that is still in the bac=
kup mode will get dropped, before the new DF election is complete? Why cant=
 this be used as FRR? Or what is the use case of having backup node(s)?

[JORGE2] when the primary node fails, ES and AD routes are withdrawn.
Suppose we have a full mesh of iBGP sessions b/w the PEs, then who would wi=
thdraw the routes if the primary PE / DF itself fails? Instead, the BGP ses=
sion would timeout causing the primary PE's neighbors to flush out the A-D =
routes received from the primary PE, right? This can take several seconds, =
isn't it?

Regards,
Muthu

The AD route withdrawal is an indication for remote nodes that they have to=
 send traffic to the backup (for a given MAC) or to flush the MACs if there=
 are more than 2 PEs in the ES. Around the same time or maybe earlier, the =
ES route withdrawal will make the backup PE take over as DF. So the overall=
 convergence time will depend on how/when those two things happen in time. =
Only the DF PE can forward traffic. A non-DF can never forward traffic or t=
here will be risk of duplicate packets.


2.      Will all the nodes in backup mode forward the packet before DF elec=
tion?

[JORGE] Only the new DF can forward.



3. If they forward, how is duplicate packets handled, in this case?
[JORGE] see above.

My two cents..

Thanks.
Jorge



From:BESS <bess-bounces@ietf.org<mailto:bess-bounces@ietf.org>> on behalf o=
f Jaikumar Somasundaram <jaikumar.somasundaram@ericsson.com<mailto:jaikumar=
.somasundaram@ericsson..com>>
Date: Thursday, October 4, 2018 at 10:03 AM
To: "bess@ietf.org<mailto:bess@ietf.org>" <bess@ietf.org<mailto:bess@ietf.o=
rg>>
Cc: Jiang He <jiang.he@ericsson.com<mailto:jiang.he@ericsson.com>>, P Muthu=
 Arul Mozhi <p.muthu.arul.mozhi@ericsson.com<mailto:p.muthu.arul.mozhi@eric=
sson.com>>
Subject: [bess] EVPN MH: Backup node behavior in Primary Path Failure


Hello Everyone,

Sorry if it is a duplicate. I repost this query as I did not receive any re=
sponse yet.
(I was wondering if this mail already reached the group or not)


I have a question on Primary PE encountering a failure in EVPN multihoming

in single active mode.



RFC7432, section 14.1.1:

<snip>

   If there is more than one backup PE for a given ES, the remote PE

   MUST use the primary PE's withdrawal of its set of Ethernet A-D per

   ES routes as a trigger to start flooding traffic for the associated

   MAC addresses (as long as flooding of unknown unicast packets is

   administratively allowed), as it is not possible to select a single

   backup PE.

</snip>



Questions:

1. Will the node in backup mode forward the packet to CE?

2. Will all the nodes in backup mode forward the packet before DF election?

3. If they forward, how is duplicate packets handled, in this case?



Please help me anwere these questions.



Thanks & Regards

Jaikumar S


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<div style=3D"direction: ltr;">
<div>I agree John.</div>
<div style=3D"direction: ltr;">Thanks,</div>
<div style=3D"direction: ltr;">Jorge</div>
<div><br>
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ri, sans-serif" style=3D"font-size:11pt" color=3D"#000000"><b>From:</b> Joh=
n E Drake &lt;jdrake@juniper.net&gt;<br>
<b>Sent:</b> Tuesday, October 16, 2018 07:43<br>
<b>To:</b> Rabadan, Jorge (Nokia - US/Mountain View); Zhuangshunwan; Muthu =
Arul Mozhi Perumal<br>
<b>Cc:</b> jiang.he@ericsson.com; p.muthu.arul.mozhi@ericsson.com; jaikumar=
.somasundaram@ericsson.com; bess@ietf.org<br>
<b>Subject:</b> RE: [bess] EVPN MH: Backup node behavior in Primary Path Fa=
ilure
<div>&nbsp;</div>
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<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Jorge,</span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">The other possibility =
for this case is for each PE to advertise a Per EVI Ethernet A-D route for =
only those EVIs for which it would become DF if the current DF were to fail=
.</span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Yours Irrespectively,<=
/span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">John</span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">&nbsp;</span></p>
<div style=3D"border:none; border-left:solid blue 1.5pt; padding:0in 0in 0i=
n 4.0pt">
<div>
<div style=3D"border:none; border-top:solid #E1E1E1 1.0pt; padding:3.0pt 0i=
n 0in 0in">
<p class=3D"MsoNormal"><b>From:</b> BESS &lt;bess-bounces@ietf.org&gt; <b>O=
n Behalf Of </b>
Rabadan, Jorge (Nokia - US/Mountain View)<br>
<b>Sent:</b> Tuesday, October 16, 2018 4:56 AM<br>
<b>To:</b> Zhuangshunwan &lt;zhuangshunwan@huawei.com&gt;; Muthu Arul Mozhi=
 Perumal &lt;muthu.arul@gmail.com&gt;<br>
<b>Cc:</b> jiang.he@ericsson.com; p.muthu.arul.mozhi@ericsson.com; jaikumar=
.somasundaram@ericsson.com; bess@ietf.org<br>
<b>Subject:</b> Re: [bess] EVPN MH: Backup node behavior in Primary Path Fa=
ilure</p>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;</p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"font-famil=
y:&quot;HelveticaNeue&quot;,serif; color:#333333">Hi,</span><span style=3D"=
font-size:12.0pt; line-height:150%; font-family:&quot;HelveticaNeue&quot;,s=
erif; color:#333333"></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"font-famil=
y:&quot;HelveticaNeue&quot;,serif; color:#333333">&nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"font-famil=
y:&quot;HelveticaNeue&quot;,serif; color:#333333">RFC7432 explains that if =
there are more than 2 PEs in the ES, then, upon receiving the AD route with=
drawals, the remote PE will flood. That is, it=92ll
 flush the MACs and flood since it does not know who the new DF is, and the=
re is no backup for a given MAC.</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"font-famil=
y:&quot;HelveticaNeue&quot;,serif; color:#333333">&nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"font-famil=
y:&quot;HelveticaNeue&quot;,serif; color:#333333">So yes, with more than 2 =
PEs, there is no backup per se. Note that, even if we had the BDF indicatio=
n, upon an ES failure the remote PE will start receiving
 MAC/IP route withdrawals. Hence unless the re advertisements of the MACs s=
tart coming immediately, the BDF indication may not avoid flooding anyway..=
 We can add the P and B bits here too, but they may not be as useful as in =
RFC8214.</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"font-famil=
y:&quot;HelveticaNeue&quot;,serif; color:#333333">&nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"font-famil=
y:&quot;HelveticaNeue&quot;,serif; color:#333333">Thanks,</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"font-famil=
y:&quot;HelveticaNeue&quot;,serif; color:#333333">Jorge</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"font-famil=
y:&quot;HelveticaNeue&quot;,serif; color:#333333">&nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"font-famil=
y:&quot;HelveticaNeue&quot;,serif; color:#333333">&nbsp;</span></p>
</div>
</div>
<div>
<div class=3D"MsoNormal" align=3D"center" style=3D"text-align:center; line-=
height:150%">
<span style=3D"font-family:&quot;HelveticaNeue&quot;,serif; color:#333333">
<hr size=3D"3" width=3D"98%" align=3D"center">
</span></div>
<div id=3D"divRplyFwdMsg">
<p class=3D"MsoNormal" style=3D"line-height:150%"><b><span style=3D"color:b=
lack">From:</span></b><span style=3D"color:black"> Zhuangshunwan &lt;<a hre=
f=3D"mailto:zhuangshunwan@huawei.com">zhuangshunwan@huawei.com</a>&gt;<br>
<b>Sent:</b> Tuesday, October 16, 2018 00:19<br>
<b>To:</b> Rabadan, Jorge (Nokia - US/Mountain View); Muthu Arul Mozhi Peru=
mal<br>
<b>Cc:</b> <a href=3D"mailto:jiang.he@ericsson.com">jiang.he@ericsson.com</=
a>; <a href=3D"mailto:p.muthu.arul.mozhi@ericsson.com">
p.muthu.arul.mozhi@ericsson.com</a>; <a href=3D"mailto:bess@ietf.org">bess@=
ietf.org</a>;<a href=3D"mailto:jaikumar.somasundaram@ericsson.com">jaikumar=
.somasundaram@ericsson.com</a><br>
<b>Subject:</b> RE: [bess] EVPN MH: Backup node behavior in Primary Path Fa=
ilure </span>
</p>
<div>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:blac=
k">&nbsp;</span></p>
</div>
</div>
<div>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">Hi Jorge,</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">&nbsp;</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">8.4.&nbsp; Aliasing and Backup Path of RFC7432 says:</span><span style=
=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">&nbsp;</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">&lt;snip&gt;</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">.&nbsp;&nbsp; The backup path is a closely related function, but it is=
 used in</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">.&nbsp;&nbsp; Single-Active redundancy mode.&nbsp; In this case, a PE =
also advertises</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">.&nbsp;&nbsp; that it has reachability to a given EVI/ES using the sam=
e combination</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">.&nbsp;&nbsp; of Ethernet A-D per EVI route and Ethernet A-D per ES ro=
ute as</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">.&nbsp;&nbsp; discussed above, but with the &quot;Single-Active&quot; =
bit in the flags of the</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">.&nbsp;&nbsp; ESI Label extended community set to 1.&nbsp; A remote PE=
 that receives a</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">.&nbsp;&nbsp; MAC/IP Advertisement route with a non-reserved ESI SHOUL=
D consider</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">.&nbsp;&nbsp; the advertised MAC address to be reachable via any PE th=
at has</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">.&nbsp;&nbsp; advertised this combination of Ethernet A-D routes, and =
it SHOULD</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">.&nbsp;&nbsp; install a backup path for that MAC address.</span><span =
style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">&lt;snip&gt;&nbsp;&nbsp;</span><span style=3D"color:#333333"></span></=
p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">&nbsp;</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">Actually, do we think that the function described in this section only=
 works when there are only 2 PEs in one ES?</span><span style=3D"color:#333=
333"></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">When there are more than 2 PEs in one ES, it cannot work unless RFC743=
2 also introduce the BDF election function defined in RFC8214.</span><span =
style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">&nbsp;</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">Regards,</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">Shunwan</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#1F4=
97D">&nbsp;</span><span style=3D"color:#333333"></span></p>
<div>
<div style=3D"border:none; border-top:solid #E1E1E1 1.0pt; padding:3.0pt 0i=
n 0in 0in">
<p class=3D"MsoNormal" style=3D"line-height:150%"><b><span style=3D"color:#=
333333">From:</span></b><span style=3D"color:#333333"> BESS [<a href=3D"mai=
lto:bess-bounces@ietf.org">mailto:bess-bounces@ietf.org</a>]<b>On Behalf Of=
</b>Rabadan, Jorge (Nokia - US/Mountain View)<br>
<b>Sent:</b> Friday, October 05, 2018 2:01 PM<br>
<b>To:</b> Muthu Arul Mozhi Perumal &lt;<a href=3D"mailto:muthu.arul@gmail.=
com">muthu.arul@gmail.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:jiang.he@ericsson.com">jiang.he@ericsson.com</=
a>; <a href=3D"mailto:p.muthu.arul.mozhi@ericsson.com">
p.muthu.arul.mozhi@ericsson.com</a>; <a href=3D"mailto:bess@ietf.org">bess@=
ietf.org</a>;<a href=3D"mailto:jaikumar.somasundaram@ericsson.com">jaikumar=
.somasundaram@ericsson.com</a><br>
<b>Subject:</b> Re: [bess] EVPN MH: Backup node behavior in Primary Path Fa=
ilure</span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"color:#333=
333">&nbsp;</span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"font-size:=
10.5pt; line-height:150%; font-family:Consolas; color:#333333">That should =
be true only in RFC8214. That=92s my point=85</span><span style=3D"color:#3=
33333"></span></p>
<p class=3D"MsoNormal" style=3D"line-height:150%"><span style=3D"font-size:=
10.5pt; line-height:150%; font-family:Consolas; color:#333333">&nbsp;</span=
><span style=3D"color:#333333"></span></p>
<div style=3D"border:none; border-top:solid #B5C4DF 1.0pt; padding:3.0pt 0i=
n 0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:.5in; line-height:150%"><b><spa=
n style=3D"font-size:12.0pt; line-height:150%; color:black">From:</span></b=
><span style=3D"font-size:12.0pt; line-height:150%; color:black">Muthu Arul=
 Mozhi Perumal &lt;<a href=3D"mailto:muthu.arul@gmail.com">muthu.arul@gmail=
.com</a>&gt;<br>
<b>Date: </b>Friday, October 5, 2018 at 5:47 AM<br>
<b>To: </b>&quot;Rabadan, Jorge (Nokia - US/Mountain View)&quot; &lt;<a hre=
f=3D"mailto:jorge.rabadan@nokia.com">jorge.rabadan@nokia.com</a>&gt;<br>
<b>Cc: </b>&quot;<a href=3D"mailto:jaikumar.somasundaram@ericsson.com">jaik=
umar.somasundaram@ericsson.com</a>&quot; &lt;<a href=3D"mailto:jaikumar.som=
asundaram@ericsson.com">jaikumar.somasundaram@ericsson.com</a>&gt;, &quot;<=
a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>&quot; &lt;<a href=3D"mail=
to:bess@ietf.org">bess@ietf.org</a>&gt;,
 &quot;<a href=3D"mailto:jiang.he@ericsson.com">jiang.he@ericsson.com</a>&q=
uot; &lt;<a href=3D"mailto:jiang.he@ericsson.com">jiang.he@ericsson.com</a>=
&gt;, &quot;<a href=3D"mailto:p.muthu.arul.mozhi@ericsson.com">p.muthu.arul=
..mozhi@ericsson.com</a>&quot; &lt;<a href=3D"mailto:p.muthu.arul.mozhi@eri=
csson.com">p.muthu.arul.mozhi@ericsson.com</a>&gt;<br>
<b>Subject: </b>Re: [bess] EVPN MH: Backup node behavior in Primary Path Fa=
ilure</span><span style=3D"color:#333333"></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in; line-height:150%"><span s=
tyle=3D"color:#333333">&nbsp;</span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in; line-height:150%"><span s=
tyle=3D"font-family:&quot;Courier New&quot;; color:#333333">Thanks, Jorge.<=
/span><span style=3D"color:#333333"></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in; line-height:150%"><span s=
tyle=3D"color:#333333">&nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in; line-height:150%"><span s=
tyle=3D"font-family:&quot;Courier New&quot;; color:#333333">In EVPN single-=
active dual-homing or EVPN VPWS single-active multi-homing, when other PEs =
realize that the DF is dead, they all need to re-run
 the DF election for sure. However, traffic recovery need not wait until th=
e DF election gets over electing a new DF..it only requires the other PEs a=
nd the backup to realize the primary/DF is dead and start forward. That's m=
y point..</span><span style=3D"color:#333333"></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in; line-height:150%"><span s=
tyle=3D"color:#333333">&nbsp;</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in; line-height:150%"><span s=
tyle=3D"font-family:&quot;Courier New&quot;; color:#333333">Regards,</span>=
<span style=3D"color:#333333"></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in; line-height:150%"><span s=
tyle=3D"font-family:&quot;Courier New&quot;; color:#333333">Muthu</span><sp=
an style=3D"color:#333333"></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in; line-height:150%"><span s=
tyle=3D"color:#333333">&nbsp;</span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in; line-height:150%"><span s=
tyle=3D"color:#333333">On Fri, Oct 5, 2018 at 1:30 AM Rabadan, Jorge (Nokia=
 - US/Mountain View) &lt;<a href=3D"mailto:jorge.rabadan@nokia.com">jorge.r=
abadan@nokia.com</a>&gt; wrote:</span></p>
</div>
<blockquote style=3D"border:none; border-left:solid #CCCCCC 1.0pt; padding:=
0in 0in 0in 6.0pt; margin-left:4.8pt; margin-top:5.0pt; margin-right:0in; m=
argin-bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:.5in; line-height:150%"><span s=
tyle=3D"font-size:10.5pt; line-height:150%; font-family:Consolas; color:#33=
3333">Muthu,</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in; line-height:150%"><span s=
tyle=3D"font-size:10.5pt; line-height:150%; font-family:Consolas; color:#33=
3333">&nbsp;</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in; line-height:150%"><span s=
tyle=3D"font-size:10.5pt; line-height:150%; font-family:Consolas; color:#33=
3333">&nbsp;</span><span style=3D"color:#333333"></span></p>
<div style=3D"border:none; border-top:solid #B5C4DF 1.0pt; padding:3.0pt 0i=
n 0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:1.0in; line-height:150%"><b><sp=
an style=3D"font-size:12.0pt; line-height:150%; color:black">From:</span></=
b><span style=3D"font-size:12.0pt; line-height:150%; color:black">Muthu Aru=
l Mozhi Perumal &lt;<a href=3D"mailto:muthu.arul@gmail.com" target=3D"_blan=
k">muthu.arul@gmail.com</a>&gt;<br>
<b>Date: </b>Thursday, October 4, 2018 at 5:37 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>&quot;<a href=3D"mailto:jaikumar.somasundaram@ericsson.com" targ=
et=3D"_blank">jaikumar.somasundaram@ericsson.com</a>&quot; &lt;<a href=3D"m=
ailto:jaikumar.somasundaram@ericsson.com" target=3D"_blank">jaikumar.somasu=
ndaram@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.org</a>&g=
t;, &quot;<a href=3D"mailto:jiang.he@ericsson.com" target=3D"_blank">jiang.=
he@ericsson.com</a>&quot; &lt;<a href=3D"mailto:jiang.he@ericsson.com" targ=
et=3D"_blank">jiang.he@ericsson.com</a>&gt;, &quot;<a href=3D"mailto:p.muth=
u.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@ericsson.co=
m</a>&quot;
 &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] EVPN MH: Backup node behavior in Primary Path Fa=
ilure</span><span style=3D"color:#333333"></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in; line-height:150%"><span =
style=3D"color:#333333">&nbsp;</span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in; line-height:150%"><span =
style=3D"font-size:12.0pt; line-height:150%; font-family:&quot;Arial&quot;,=
sans-serif; color:#333333">Thanks, Jorge. This is inline with my thinking. =
So, in single-active multihoming, once the primary
 is dead we don't need to wait for the DF election to happen for the backup=
 (or some other PE in the ES) to become active and start forwarding traffic=
 over the ES, instead it only requires the remote PEs and backup to realize=
 that the primary is dead (thru'
 NH tracking / BFD) and start forwarding over the ES, right?</span><span st=
yle=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:.5in; line-height:150%"><span s=
tyle=3D"font-size:10.5pt; line-height:150%; font-family:Consolas; color:#33=
3333">[JORGE] When the other PEs in the ES realize the DF is dead, they nee=
d to remove the dead PE from the candidate
 list and run DF Election. You may optimize things if you only have two PEs=
 in the ES (such as skip the timer) but if you have more than 2 PEs in the =
ES, there is really no concept of backup PE in RFC7432, but simply the othe=
r PEs are non-DF. However, the concept
 of backup PE in an ES with more than two PEs is specified in RFC8214, wher=
e all the PEs in the ES not only elect a DF but also a backup DF, and signa=
l this backup condition in the AD per-EVI routes. Note this is not there in=
 RFC7432.</span><span style=3D"color:#333333"></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in; line-height:150%"><span =
style=3D"font-size:12.0pt; line-height:150%; font-family:&quot;Arial&quot;,=
sans-serif; color:#333333">&nbsp;</span><span style=3D"color:#333333"></spa=
n></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in; line-height:150%"><span =
style=3D"font-size:12.0pt; line-height:150%; font-family:&quot;Arial&quot;,=
sans-serif; color:#333333">Regards,</span><span style=3D"color:#333333"></s=
pan></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in; line-height:150%"><span =
style=3D"font-size:12.0pt; line-height:150%; font-family:&quot;Arial&quot;,=
sans-serif; color:#333333">Muthu</span><span style=3D"color:#333333"></span=
></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in; line-height:150%"><span =
style=3D"font-size:12.0pt; line-height:150%; font-family:&quot;Arial&quot;,=
sans-serif; color:#333333">&nbsp;</span><span style=3D"color:#333333"></spa=
n></p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in; line-height:150%"><span =
style=3D"color:#333333">On Thu, Oct 4, 2018 at 8:10 PM Rabadan, Jorge (Noki=
a - US/Mountain View) &lt;<a href=3D"mailto:jorge.rabadan@nokia.com" target=
=3D"_blank">jorge.rabadan@nokia.com</a>&gt; wrote:</span></p>
</div>
<blockquote style=3D"border:none; border-left:solid #CCCCCC 1.0pt; padding:=
0in 0in 0in 6.0pt; margin-left:4.8pt; margin-top:5.0pt; margin-right:0in; m=
argin-bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in; line-height:150%"><span =
style=3D"font-size:10.5pt; line-height:150%; font-family:Consolas; color:#3=
33333">Muthu,</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in; line-height:150%"><span =
style=3D"font-size:10.5pt; line-height:150%; font-family:Consolas; color:#3=
33333">&nbsp;</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in; line-height:150%"><span =
style=3D"font-size:10.5pt; line-height:150%; font-family:Consolas; color:#3=
33333">About this:</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in; line-height:150%"><span =
style=3D"font-size:10.5pt; line-height:150%; font-family:Consolas; color:#3=
33333">&nbsp;</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.5in; line-height:150%"><span =
style=3D"font-size:12.0pt; line-height:150%; font-family:&quot;Arial&quot;,=
sans-serif; color:#333333">Suppose we have a full mesh of iBGP sessions b/w=
 the PEs, then who would withdraw the routes if
 the primary PE / DF itself fails? Instead, the BGP session would timeout c=
ausing the primary PE's neighbors to flush out the A-D routes received from=
 the primary PE, right? This can take several seconds, isn't it?</span><spa=
n style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in; line-height:150%"><span =
style=3D"font-size:12.0pt; line-height:150%; font-family:&quot;Arial&quot;,=
sans-serif; color:#333333">&nbsp;</span><span style=3D"color:#333333"></spa=
n></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in; line-height:150%"><span =
style=3D"font-size:10.5pt; line-height:150%; font-family:Consolas; color:#3=
33333">No, not in the implementations I know of. Next Hop tracking will imm=
ediately detect that the PE is not in
 the network anymore and the routes will be invalidated. You can also boots=
trap the BGP sessions to BFD.</span><span style=3D"color:#333333"></span></=
p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in; line-height:150%"><span =
style=3D"font-size:10.5pt; line-height:150%; font-family:Consolas; color:#3=
33333">But that has nothing to do with EVPN!.. it=92s regular BGP.</span><s=
pan style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in; line-height:150%"><span =
style=3D"font-size:10.5pt; line-height:150%; font-family:Consolas; color:#3=
33333">&nbsp;</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in; line-height:150%"><span =
style=3D"font-size:10.5pt; line-height:150%; font-family:Consolas; color:#3=
33333">Thx</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in; line-height:150%"><span =
style=3D"font-size:10.5pt; line-height:150%; font-family:Consolas; color:#3=
33333">Jorge</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.0in; line-height:150%"><span =
style=3D"font-size:10.5pt; line-height:150%; font-family:Consolas; color:#3=
33333">&nbsp;</span><span style=3D"color:#333333"></span></p>
<div style=3D"border:none; border-top:solid #B5C4DF 1.0pt; padding:3.0pt 0i=
n 0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:1.5in; line-height:150%"><b><sp=
an style=3D"font-size:12.0pt; line-height:150%; color:black">From:</span></=
b><span style=3D"font-size:12.0pt; line-height:150%; color:black">Muthu Aru=
l Mozhi Perumal &lt;<a href=3D"mailto:muthu.arul@gmail.com" target=3D"_blan=
k">muthu.arul@gmail.com</a>&gt;<br>
<b>Date: </b>Thursday, October 4, 2018 at 1:14 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>&quot;<a href=3D"mailto:jaikumar.somasundaram@ericsson.com" targ=
et=3D"_blank">jaikumar.somasundaram@ericsson.com</a>&quot; &lt;<a href=3D"m=
ailto:jaikumar.somasundaram@ericsson.com" target=3D"_blank">jaikumar.somasu=
ndaram@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.org</a>&g=
t;, &quot;<a href=3D"mailto:jiang.he@ericsson.com" target=3D"_blank">jiang.=
he@ericsson.com</a>&quot; &lt;<a href=3D"mailto:jiang.he@ericsson.com" targ=
et=3D"_blank">jiang.he@ericsson.com</a>&gt;, &quot;<a href=3D"mailto:p.muth=
u.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@ericsson.co=
m</a>&quot;
 &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] EVPN MH: Backup node behavior in Primary Path Fa=
ilure</span><span style=3D"color:#333333"></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.5in; line-height:150%"><span =
style=3D"color:#333333">&nbsp;</span></p>
</div>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.5in; line-height:150%"><span =
style=3D"font-size:12.0pt; line-height:150%; font-family:&quot;Arial&quot;,=
sans-serif; color:#333333">Please see inline..</span><span style=3D"color:#=
333333"></span></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:1.5in; line-height:150%"><span =
style=3D"color:#333333">&nbsp;</span></p>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.5in; line-height:150%"><span =
style=3D"color:#333333">On Thu, Oct 4, 2018 at 3:33 PM Rabadan, Jorge (Noki=
a - US/Mountain View) &lt;<a href=3D"mailto:jorge.rabadan@nokia.com" target=
=3D"_blank">jorge.rabadan@nokia.com</a>&gt; wrote:</span></p>
</div>
<blockquote style=3D"border:none; border-left:solid #CCCCCC 1.0pt; padding:=
0in 0in 0in 6.0pt; margin-left:4.8pt; margin-top:5.0pt; margin-right:0in; m=
argin-bottom:5.0pt">
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.5in; line-height:150%"><span =
style=3D"font-size:10.5pt; line-height:150%; font-family:Consolas; color:#3=
33333">In-line.</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.5in; line-height:150%"><span =
style=3D"font-size:10.5pt; line-height:150%; font-family:Consolas; color:#3=
33333">&nbsp;</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.5in; line-height:150%"><span =
style=3D"font-size:10.5pt; line-height:150%; font-family:Consolas; color:#3=
33333">Thx</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.5in; line-height:150%"><span =
style=3D"font-size:10.5pt; line-height:150%; font-family:Consolas; color:#3=
33333">Jorge</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:1.5in; line-height:150%"><span =
style=3D"font-size:10.5pt; line-height:150%; font-family:Consolas; color:#3=
33333">&nbsp;</span><span style=3D"color:#333333"></span></p>
<div style=3D"border:none; border-top:solid #B5C4DF 1.0pt; padding:3.0pt 0i=
n 0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:2.0in; line-height:150%"><b><sp=
an style=3D"font-size:12.0pt; line-height:150%; color:black">From:</span></=
b><span style=3D"font-size:12.0pt; line-height:150%; color:black">Jaikumar =
Somasundaram &lt;<a href=3D"mailto:jaikumar.somasundaram@ericsson.com" targ=
et=3D"_blank">jaikumar.somasundaram@ericsson.com</a>&gt;<br>
<b>Date: </b>Thursday, October 4, 2018 at 11:28 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;, &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">b=
ess@ietf.org</a>&gt;<br>
<b>Cc: </b>Jiang He &lt;<a href=3D"mailto:jiang.he@ericsson.com" target=3D"=
_blank">jiang.he@ericsson.com</a>&gt;, P Muthu Arul Mozhi &lt;<a href=3D"ma=
ilto:p.muthu.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@=
ericsson.com</a>&gt;<br>
<b>Subject: </b>RE: [bess] EVPN MH: Backup node behavior in Primary Path Fa=
ilure</span><span style=3D"color:#333333"></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in; line-height:150%"><span =
style=3D"color:#333333">&nbsp;</span></p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in; line-height:150%"><span =
style=3D"color:#0070C0">Thanks Jorge for the quick reply.</span><span style=
=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in; line-height:150%"><span =
style=3D"color:#0070C0">Please find further question below.</span><span sty=
le=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in; line-height:150%"><span =
style=3D"color:#333333">&nbsp;</span></p>
<div>
<div style=3D"border:none; border-top:solid #E1E1E1 1.0pt; padding:3.0pt 0i=
n 0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:2.0in; line-height:150%"><b><sp=
an style=3D"color:#333333">From:</span></b><span style=3D"color:#333333"> R=
abadan, Jorge (Nokia - US/Mountain View) &lt;<a href=3D"mailto:jorge.rabada=
n@nokia.com" target=3D"_blank">jorge.rabadan@nokia.com</a>&gt;<br>
<b>Sent:</b> Thursday, October 4, 2018 1:52 PM<br>
<b>To:</b> Jaikumar Somasundaram &lt;<a href=3D"mailto:jaikumar.somasundara=
m@ericsson.com" target=3D"_blank">jaikumar.somasundaram@ericsson.com</a>&gt=
;;<a href=3D"mailto:bess@ietf.org" target=3D"_blank">bess@ietf.org</a><br>
<b>Cc:</b> Jiang He &lt;<a href=3D"mailto:jiang.he@ericsson.com" target=3D"=
_blank">jiang.he@ericsson.com</a>&gt;; P Muthu Arul Mozhi &lt;<a href=3D"ma=
ilto:p.muthu.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@=
ericsson.com</a>&gt;<br>
<b>Subject:</b> Re: [bess] EVPN MH: Backup node behavior in Primary Path Fa=
ilure</span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in; line-height:150%"><span =
style=3D"color:#333333">&nbsp;</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in; line-height:150%"><span =
style=3D"font-size:10.5pt; line-height:150%; font-family:Consolas; color:#3=
33333">Hi,</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in; line-height:150%"><span =
style=3D"font-size:10.5pt; line-height:150%; font-family:Consolas; color:#3=
33333">&nbsp;</span><span style=3D"color:#333333"></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.5in; line-height:150%">
<span style=3D"color:#333333">Questions:</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.75in; line-height:150%"><span=
 style=3D"color:#333333">1.</span><span style=3D"font-size:7.0pt; line-heig=
ht:150%; font-family:&quot;Times New Roman&quot;,serif; color:#333333">&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style=3D"color:#333333">Will t=
he node
 in backup mode forward the packet to CE?</span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in; line-height:150%">
<span style=3D"color:#333333">[JORGE] as soon as it becomes DF it can forwa=
rd packets to the CE. The backup node will have to run DF election upon the=
 ES route withdrawal from the primary. If AC-DF is enabled, it can also rea=
ct to the withdrawal of AD routes
 from the primary PE.</span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in; line-height:150%">
<b><i><span style=3D"color:#333333">[Jai] Does that mean if any packet come=
s to a node that is still in the backup mode will get dropped, before the n=
ew DF election is complete? Why cant this be used as FRR? Or what is the us=
e case of having backup node(s)?</span></i></b><span style=3D"color:#333333=
"></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:1.5in; line-height:150%">
<b><span style=3D"font-size:10.5pt; line-height:150%; font-family:Consolas;=
 color:#333333">[JORGE2] when the primary node fails, ES and AD routes are =
withdrawn.</span></b><span style=3D"color:#333333"></span></p>
</div>
</div>
</blockquote>
<div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.5in; line-height:150%"><span =
style=3D"font-size:12.0pt; line-height:150%; font-family:&quot;Arial&quot;,=
sans-serif; color:#333333">Suppose we have a full mesh of iBGP sessions b/w=
 the PEs, then who would withdraw the routes if
 the primary PE / DF itself fails? Instead, the BGP session would timeout c=
ausing the primary PE's neighbors to flush out the A-D routes received from=
 the primary PE, right? This can take several seconds, isn't it?</span><spa=
n style=3D"color:#333333"></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.5in; line-height:150%"><span =
style=3D"font-size:12.0pt; line-height:150%; font-family:&quot;Arial&quot;,=
sans-serif; color:#333333">&nbsp;</span><span style=3D"color:#333333"></spa=
n></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.5in; line-height:150%"><span =
style=3D"font-size:12.0pt; line-height:150%; font-family:&quot;Arial&quot;,=
sans-serif; color:#333333">Regards,</span><span style=3D"color:#333333"></s=
pan></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:1.5in; line-height:150%"><span =
style=3D"font-size:12.0pt; line-height:150%; font-family:&quot;Arial&quot;,=
sans-serif; color:#333333">Muthu</span><span style=3D"color:#333333"></span=
></p>
</div>
</div>
<blockquote style=3D"border:none; border-left:solid #CCCCCC 1.0pt; padding:=
0in 0in 0in 6.0pt; margin-left:4.8pt; margin-top:5.0pt; margin-right:0in; m=
argin-bottom:5.0pt">
<div>
<div>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:1.5in; line-height:150%">
<b><span style=3D"font-size:10.5pt; line-height:150%; font-family:Consolas;=
 color:#333333">The AD route withdrawal is an indication for remote nodes t=
hat they have to send traffic to the backup (for a given MAC) or to flush t=
he MACs if there are more than 2 PEs
 in the ES. Around the same time or maybe earlier, the ES route withdrawal =
will make the backup PE take over as DF. So the overall convergence time wi=
ll depend on how/when those two things happen in time. Only the DF PE can f=
orward traffic. A non-DF can never
 forward traffic or there will be risk of duplicate packets.</span></b><spa=
n style=3D"color:#333333"></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in; line-height:150%">
<span style=3D"color:#333333">&nbsp;</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.75in; line-height:150%"><span=
 style=3D"color:#333333">2.</span><span style=3D"font-size:7.0pt; line-heig=
ht:150%; font-family:&quot;Times New Roman&quot;,serif; color:#333333">&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span><span style=3D"color:#333333">Will a=
ll the
 nodes in backup mode forward the packet before DF election?</span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in; line-height:150%">
<span style=3D"color:#333333">[JORGE] Only the new DF can forward.</span></=
p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in; line-height:150%">
<span style=3D"color:#333333">&nbsp;</span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.5in; line-height:150%">
<span style=3D"color:#333333">3. If they forward, how is duplicate packets =
handled, in this case?</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in; line-height:150%"><span =
style=3D"font-size:10.5pt; line-height:150%; font-family:Consolas; color:#3=
33333">[JORGE] see above.</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in; line-height:150%"><span =
style=3D"font-size:10.5pt; line-height:150%; font-family:Consolas; color:#3=
33333">&nbsp;</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in; line-height:150%"><span =
style=3D"font-size:10.5pt; line-height:150%; font-family:Consolas; color:#3=
33333">My two cents..</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in; line-height:150%"><span =
style=3D"font-size:10.5pt; line-height:150%; font-family:Consolas; color:#3=
33333">&nbsp;</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in; line-height:150%"><span =
style=3D"font-size:10.5pt; line-height:150%; font-family:Consolas; color:#3=
33333">Thanks.</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in; line-height:150%"><span =
style=3D"font-size:10.5pt; line-height:150%; font-family:Consolas; color:#3=
33333">Jorge</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in; line-height:150%"><span =
style=3D"font-size:10.5pt; line-height:150%; font-family:Consolas; color:#3=
33333">&nbsp;</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in; line-height:150%"><span =
style=3D"font-size:10.5pt; line-height:150%; font-family:Consolas; color:#3=
33333">&nbsp;</span><span style=3D"color:#333333"></span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in; line-height:150%"><span =
style=3D"font-size:10.5pt; line-height:150%; font-family:Consolas; color:#3=
33333">&nbsp;</span><span style=3D"color:#333333"></span></p>
<div style=3D"border:none; border-top:solid #B5C4DF 1.0pt; padding:3.0pt 0i=
n 0in 0in">
<p class=3D"MsoNormal" style=3D"margin-left:2.0in; line-height:150%"><b><sp=
an style=3D"font-size:12.0pt; line-height:150%; color:black">From:</span></=
b><span style=3D"font-size:12.0pt; line-height:150%; color:black">BESS &lt;=
<a href=3D"mailto:bess-bounces@ietf.org" target=3D"_blank">bess-bounces@iet=
f.org</a>&gt;
 on behalf of Jaikumar Somasundaram &lt;<a href=3D"mailto:jaikumar.somasund=
aram@ericsson..com" target=3D"_blank">jaikumar.somasundaram@ericsson.com</a=
>&gt;<br>
<b>Date: </b>Thursday, October 4, 2018 at 10:03 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>Jiang He &lt;<a href=3D"mailto:jiang.he@ericsson.com" target=3D"=
_blank">jiang.he@ericsson.com</a>&gt;, P Muthu Arul Mozhi &lt;<a href=3D"ma=
ilto:p.muthu.arul.mozhi@ericsson.com" target=3D"_blank">p.muthu.arul.mozhi@=
ericsson.com</a>&gt;<br>
<b>Subject: </b>[bess] EVPN MH: Backup node behavior in Primary Path Failur=
e</span><span style=3D"color:#333333"></span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in; line-height:150%"><span =
style=3D"color:#333333">&nbsp;</span></p>
</div>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in; line-height:150%">
<span style=3D"color:#333333">Hello Everyone,</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in; line-height:150%"><span =
style=3D"color:#333333">&nbsp;</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in; line-height:150%"><span =
style=3D"color:#333333">Sorry if it is a duplicate. I repost this query as =
I did not receive any response yet.</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in; line-height:150%"><span =
style=3D"color:#333333">(I was wondering if this mail already reached the g=
roup or not)</span></p>
<p class=3D"MsoNormal" style=3D"margin-left:2.0in; line-height:150%"><span =
style=3D"color:#333333">&nbsp;</span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in; line-height:150%">
<span style=3D"color:#333333">I have a question on Primary PE encountering =
a failure in EVPN multihoming</span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in; line-height:150%">
<span style=3D"color:#333333">in single active mode.</span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in; line-height:150%">
<span style=3D"color:#333333">&nbsp;</span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in; line-height:150%">
<span style=3D"color:#333333">RFC7432, section 14.1.1:</span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in; line-height:150%">
<span style=3D"font-family:&quot;Courier New&quot;; color:#333333">&lt;snip=
&gt;</span><span style=3D"color:#333333"></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in; line-height:150%">
<span style=3D"font-family:&quot;Courier New&quot;; color:#333333">&nbsp;&n=
bsp; If there is more than one backup PE for a given ES, the remote PE</spa=
n><span style=3D"color:#333333"></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in; line-height:150%">
<span style=3D"font-family:&quot;Courier New&quot;; color:#333333">&nbsp;&n=
bsp; MUST use the primary PE's withdrawal of its set of Ethernet A-D per</s=
pan><span style=3D"color:#333333"></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in; line-height:150%">
<span style=3D"font-family:&quot;Courier New&quot;; color:#333333">&nbsp;&n=
bsp; ES routes as a trigger to start flooding traffic for the associated</s=
pan><span style=3D"color:#333333"></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in; line-height:150%">
<span style=3D"font-family:&quot;Courier New&quot;; color:#333333">&nbsp;&n=
bsp; MAC addresses (as long as flooding of unknown unicast packets is</span=
><span style=3D"color:#333333"></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in; line-height:150%">
<span style=3D"font-family:&quot;Courier New&quot;; color:#333333">&nbsp;&n=
bsp; administratively allowed), as it is not possible to select a single</s=
pan><span style=3D"color:#333333"></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in; line-height:150%">
<span style=3D"font-family:&quot;Courier New&quot;; color:#333333">&nbsp;&n=
bsp; backup PE.</span><span style=3D"color:#333333"></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in; line-height:150%">
<span style=3D"font-family:&quot;Courier New&quot;; color:#333333">&lt;/sni=
p&gt;</span><span style=3D"color:#333333"></span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in; line-height:150%">
<span style=3D"color:#333333">&nbsp;</span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in; line-height:150%">
<span style=3D"color:#333333">Questions:</span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in; line-height:150%">
<span style=3D"color:#333333">1. Will the node in backup mode forward the p=
acket to CE?</span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in; line-height:150%">
<span style=3D"color:#333333">2. Will all the nodes in backup mode forward =
the packet before DF election?</span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in; line-height:150%">
<span style=3D"color:#333333">3. If they forward, how is duplicate packets =
handled, in this case?</span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in; line-height:150%">
<span style=3D"color:#333333">&nbsp;</span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in; line-height:150%">
<span style=3D"color:#333333">Please help me anwere these questions.</span>=
</p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in; line-height:150%">
<span style=3D"color:#333333">&nbsp;</span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in; line-height:150%">
<span style=3D"color:#333333">Thanks &amp; Regards</span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in; line-height:150%">
<span style=3D"color:#333333">Jaikumar S</span></p>
<p class=3D"m897134620352651982m-409024311180145859m-2386179909272137706mso=
plaintext" style=3D"margin-left:2.0in; line-height:150%">
<span style=3D"color:#333333">&nbsp;</span></p>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:1.5in; line-height:150%"><span =
style=3D"color:#333333">_______________________________________________<br>
BESS mailing list<br>
<a href=3D"mailto:BESS@ietf.org" target=3D"_blank">BESS@ietf.org</a><br>
<a href=3D"https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__www.ietf.=
org_mailman_listinfo_bess&amp;d=3DDwMF-g&amp;c=3DHAkYuh63rsuhr6Scbfh0UjBXeM=
K-ndb3voDTXcWzoCI&amp;r=3DCRB2tJiQePk0cT-h5LGhEWH-s_xXXup3HzvBSMRj5VE&amp;m=
=3Dllt1h0ORtcdfSlkLb74jt9vVkGyLR7KhsJZdkWdoEgc&amp;s=3DoDroIh7x63kHwujqh4jO=
ajbDMQbGlP8jcMoIyVNdt6A&amp;e=3D" target=3D"_blank">https://www.ietf.org/ma=
ilman/listinfo/bess</a></span></p>
</blockquote>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</div>
</blockquote>
</div>
</div>
</div>
</div>
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From: "Tapraj Singh (tapsingh)" <tapsingh@cisco.com>
To: John E Drake <jdrake@juniper.net>, "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>, Zhuangshunwan <zhuangshunwan@huawei.com>, Muthu Arul Mozhi Perumal <muthu.arul@gmail.com>
CC: "jiang.he@ericsson.com" <jiang.he@ericsson.com>, "p.muthu.arul.mozhi@ericsson.com" <p.muthu.arul.mozhi@ericsson.com>, "bess@ietf.org" <bess@ietf.org>, "jaikumar.somasundaram@ericsson.com" <jaikumar.somasundaram@ericsson.com>
Thread-Topic: [bess] EVPN MH: Backup node behavior in Primary Path Failure
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From: "Tapraj Singh (tapsingh)" <tapsingh@cisco.com>
To: John E Drake <jdrake@juniper.net>, Zhuangshunwan <zhuangshunwan@huawei.com>, "Jakob Heitz (jheitz)" <jheitz@cisco.com>, BESS <bess@ietf.org>
Thread-Topic: [bess] Encoding a 20 bit label in a 24 bit field.
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Date: Tue, 16 Oct 2018 13:26:52 +0000
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Subject: Re: [bess] Encoding a 20 bit label in a 24 bit field.
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From: Eric Rosen <erosen@juniper.net>
To: Xiejingrong <xiejingrong@huawei.com>, "bess@ietf.org" <bess@ietf.org>
Thread-Topic: [bess] I-D Action: draft-ietf-bess-mvpn-expl-track-12.txt
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Date: Tue, 16 Oct 2018 14:01:33 +0000
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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: "bess@ietf.org" <bess@ietf.org>, "pim@ietf.org" <pim@ietf.org>
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Subject: [bess] draft-ietf-bess-mvpn-msdp-sa-interoperation
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Resend with PIM WG added.

We had good comments and discussions early on, and I believe all concerns h=
ave been addressed. Please see if you have more comments/concerns with this=
 - would like to progress the document.

Thanks!
Jeffrey

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

Hi,

The draft had some good discussions prior to its adoption and we believe we=
 have resolved issues/comments raised at that time.
A few months ago Hejia did a RtgDir Early review, and a -01 revision was po=
sted to address the comments (https://mailarchive.ietf.org/arch/msg/bess/sZ=
myDbMVznyH1vFxEAw2FIyNOHk).

This is a relatively simple and straightforward feature but important to si=
mplify practical deployments. There is at least one commercial implementati=
on already.
If you have further comments/suggestions, please bring them forward so that=
 we as a WG can actively discuss and progress the work.

Thanks!
Jeffrey


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From: "Ali Sajassi (sajassi)" <sajassi@cisco.com>
To: "Jakob Heitz (jheitz)" <jheitz@cisco.com>, Zhuangshunwan <zhuangshunwan@huawei.com>, BESS <bess@ietf.org>
Thread-Topic: [bess] Encoding a 20 bit label in a 24 bit field.
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Date: Tue, 16 Oct 2018 17:29:38 +0000
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Subject: Re: [bess] Encoding a 20 bit label in a 24 bit field.
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Subject: [bess] I-D Action: draft-ietf-bess-evpn-optimized-ir-05.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           : Optimized Ingress Replication solution for EVPN
        Authors         : Jorge Rabadan
                          Senthil Sathappan
                          Wen Lin
                          Mukul Katiyar
                          Ali Sajassi
	Filename        : draft-ietf-bess-evpn-optimized-ir-05.txt
	Pages           : 26
	Date            : 2018-10-18

Abstract:
   Network Virtualization Overlay (NVO) networks using EVPN as control
   plane may use Ingress Replication (IR) or PIM (Protocol Independent
   Multicast) based trees to convey the overlay BUM traffic. PIM
   provides an efficient solution to avoid sending multiple copies of
   the same packet over the same physical link, however it may not
   always be deployed in the NVO core network. IR avoids the dependency
   on PIM in the NVO network core. While IR provides a simple multicast
   transport, some NVO networks with demanding multicast applications
   require a more efficient solution without PIM in the core. This
   document describes a solution to optimize the efficiency of IR in NVO
   networks.


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

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-bess-evpn-optimized-ir-05
https://datatracker.ietf.org/doc/html/draft-ietf-bess-evpn-optimized-ir-05

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-bess-evpn-optimized-ir-05


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

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


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To: "Bocci, Matthew (Nokia - GB)" <matthew.bocci@nokia.com>, "draft-ietf-bess-evpn-optimized-ir@ietf.org" <draft-ietf-bess-evpn-optimized-ir@ietf.org>
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--_000_EABBA175007D483F99E9007D6A1990DEnokiacom_--


From nobody Fri Oct 19 10:43:58 2018
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Subject: [bess] I-D Action: draft-ietf-bess-l3vpn-yang-04.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the BGP Enabled ServiceS WG of the IETF.

        Title           : Yang Data Model for BGP/MPLS L3 VPNs
        Authors         : Dhanendra Jain
                          Keyur Patel
                          Patrice Brissette
                          Zhenbin Li
                          Shunwan Zhuang
                          Xufeng Liu
                          Jeffrey Haas
                          Santosh Esale
                          Bin Wen
	Filename        : draft-ietf-bess-l3vpn-yang-04.txt
	Pages           : 23
	Date            : 2018-10-19

Abstract:
   This document defines a YANG data model that can be used to configure
   and manage BGP Layer 3 VPNs.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-bess-l3vpn-yang/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-bess-l3vpn-yang-04
https://datatracker.ietf.org/doc/html/draft-ietf-bess-l3vpn-yang-04

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-bess-l3vpn-yang-04


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From nobody Fri Oct 19 11:23:13 2018
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Subject: [bess] I-D Action: draft-ietf-bess-evpn-optimized-ir-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           : Optimized Ingress Replication solution for EVPN
        Authors         : Jorge Rabadan
                          Senthil Sathappan
                          Wen Lin
                          Mukul Katiyar
                          Ali Sajassi
	Filename        : draft-ietf-bess-evpn-optimized-ir-06.txt
	Pages           : 26
	Date            : 2018-10-19

Abstract:
   Network Virtualization Overlay (NVO) networks using EVPN as control
   plane may use Ingress Replication (IR) or PIM (Protocol Independent
   Multicast) based trees to convey the overlay BUM traffic. PIM
   provides an efficient solution to avoid sending multiple copies of
   the same packet over the same physical link, however it may not
   always be deployed in the NVO core network. IR avoids the dependency
   on PIM in the NVO network core. While IR provides a simple multicast
   transport, some NVO networks with demanding multicast applications
   require a more efficient solution without PIM in the core. This
   document describes a solution to optimize the efficiency of IR in NVO
   networks.


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

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

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


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From nobody Fri Oct 19 12:04:30 2018
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Subject: [bess] bess - Requested session has been scheduled for IETF 103
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Dear Stephane Litkowski,

The session(s) that you have requested have been scheduled.
Below is the scheduled session information followed by
the original request. 


    bess Session 1 (2:00 requested)
    Monday, 5 November 2018, Afternoon Session I 1350-1550
    Room Name: Meeting 2 size: 150
    ---------------------------------------------


iCalendar: https://datatracker.ietf.org/meeting/103/sessions/bess.ics

Request Information:


---------------------------------------------------------
Working Group Name: BGP Enabled ServiceS
Area Name: Routing Area
Session Requester: Stephane Litkowski

Number of Sessions: 1
Length of Session(s):  2 Hours
Number of Attendees: 80
Conflicts to Avoid: 
 First Priority: idr nvo3
 Second Priority: spring sfc mpls pim bier pals
 Third Priority: i2rs l2sm


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

Resources Requested:

Special Requests:
  Our two last sessions had a very busy agenda, it would be great to get a 2h30 slot.

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


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Subject: [bess] I-D Action: draft-ietf-bess-evpn-df-election-framework-04.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the BGP Enabled ServiceS WG of the IETF.

        Title           : Framework for EVPN Designated Forwarder Election Extensibility
        Authors         : Jorge Rabadan
                          Satya Mohanty
                          Ali Sajassi
                          John Drake
                          Kiran Nagaraj
                          Senthil Sathappan
	Filename        : draft-ietf-bess-evpn-df-election-framework-04.txt
	Pages           : 27
	Date            : 2018-10-19

Abstract:
   The Designated Forwarder (DF) in EVPN networks is the Provider Edge
   (PE) router responsible for sending broadcast, unknown unicast and
   multicast (BUM) traffic to a multi-homed Customer Equipment (CE)
   device, on a given VLAN on a particular Ethernet Segment (ES). The DF
   is selected out of a list of candidate PEs that advertise the same
   Ethernet Segment Identifier (ESI) to the EVPN network. By default,
   EVPN uses a DF Election algorithm referred to as "Service Carving"
   and it is based on a modulus function (V mod N) that takes the number
   of PEs in the ES (N) and the VLAN value (V) as input. This default DF
   Election algorithm has some inefficiencies that this document
   addresses by defining a new DF Election algorithm and a capability to
   influence the DF Election result for a VLAN, depending on the state
   of the associated Attachment Circuit (AC). In addition, this document
   creates a registry with IANA, for future DF Election Algorithms and
   Capabilities. It also presents a formal definition and clarification
   of the DF Election Finite State Machine.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-bess-evpn-df-election-framework/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-bess-evpn-df-election-framework-04
https://datatracker.ietf.org/doc/html/draft-ietf-bess-evpn-df-election-framework-04

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-bess-evpn-df-election-framework-04


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 Fri Oct 19 15:58:23 2018
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Subject: [bess] I-D Action: draft-ietf-bess-evpn-na-flags-02.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 IPv6 Neighbor Advertisement Flags in EVPN
        Authors         : Jorge Rabadan
                          Senthil Sathappan
                          Kiran Nagaraj
	Filename        : draft-ietf-bess-evpn-na-flags-02.txt
	Pages           : 6
	Date            : 2018-10-19

Abstract:
   The MAC/IP Advertisement route specified in [RFC7432] 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 and
   reduce/suppress the flooding produced by the Address Resolution
   procedure. However, if the Neighbor information is learnt via EVPN,
   the PE would not know if a 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. This document
   proposes an OPTIONAL advertisement of the Flags defined in [RFC4861]
   along with the EVPN MAC/IP Advertisement routes, so that an EVPN PE
   implementing a proxy-ND function can reply to Neighbor Solicitations
   with the correct Flag information in Neighbor Advertisements.




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-02
https://datatracker.ietf.org/doc/html/draft-ietf-bess-evpn-na-flags-02

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https://www.ietf.org/rfcdiff?url2=draft-ietf-bess-evpn-na-flags-02


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From nobody Sat Oct 20 09:39:35 2018
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A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the BGP Enabled ServiceS WG of the IETF.

        Title           : Framework for EVPN Designated Forwarder Election Extensibility
        Authors         : Jorge Rabadan
                          Satya Mohanty
                          Ali Sajassi
                          John Drake
                          Kiran Nagaraj
                          Senthil Sathappan
	Filename        : draft-ietf-bess-evpn-df-election-framework-05.txt
	Pages           : 27
	Date            : 2018-10-20

Abstract:
   The Designated Forwarder (DF) in EVPN networks is the Provider Edge
   (PE) router responsible for sending broadcast, unknown unicast and
   multicast (BUM) traffic to a multi-homed Customer Equipment (CE)
   device, on a given VLAN on a particular Ethernet Segment (ES). The DF
   is selected out of a list of candidate PEs that advertise the same
   Ethernet Segment Identifier (ESI) to the EVPN network. By default,
   EVPN uses a DF Election algorithm referred to as "Service Carving"
   and it is based on a modulus function (V mod N) that takes the number
   of PEs in the ES (N) and the VLAN value (V) as input. This default DF
   Election algorithm has some inefficiencies that this document
   addresses by defining a new DF Election algorithm and a capability to
   influence the DF Election result for a VLAN, depending on the state
   of the associated Attachment Circuit (AC). In addition, this document
   creates a registry with IANA, for future DF Election Algorithms and
   Capabilities. It also presents a formal definition and clarification
   of the DF Election Finite State Machine.



The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-bess-evpn-df-election-framework/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-bess-evpn-df-election-framework-05
https://datatracker.ietf.org/doc/html/draft-ietf-bess-evpn-df-election-framework-05

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-bess-evpn-df-election-framework-05


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 Sun Oct 21 04:00:38 2018
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "pbrisset@cisco.com" <pbrisset@cisco.com>, "hshah@ciena.com" <hshah@ciena.com>, "jorge.rabadan@nokia.com" <jorge.rabadan@nokia.com>, "Ing-Wher_Chen@jabil.com" <Ing-Wher_Chen@jabil.com>, "ihussain@infinera.com" <ihussain@infinera.com>, "kishoret@juniper.net" <kishoret@juniper.net>
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Thread-Topic: Questions about the EVPN YANG data model draft
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/IFc6XGVsRCJNrRsluWO-AQLcuY0>
Subject: [bess] Questions about the EVPN YANG data model draft
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Dear Editors of the EVPN YANG data model draft<https://tools.ietf.org/html=
/draft-ietf-bess-evpn-yang-05>,
I have several questions regarding the draft, and would highly appreciated=
 your responses.


1.       The -05 version of the draft has expired almost two months ago. D=
o you plan to refresh it any time soon?

2.       The draft consistently uses type uint32 for the Ethernet segment =
identifier (ESI), while RFC 7432 explicitly defines it as a 10-octet integ=
er. Is this just a typo, or did I miss something substantial here?

3.       The draft states that it covers Integrated Routing and Bridging i=
n EVPN, but I could not find any traces of such coverage. Did I miss somet=
hing, or is just a forward declaration for the future version of the draft=
?

4.       RFC 7432 states that "When a customer site is connected to one or=
 more PEs via a set of Ethernet links, then this set of Ethernet links con=
stitutes an Ethernet segment". The Virtual Ethernet Segment draft<https://=
tools.ietf.org/html/draft-ietf-bess-evpn-virtual-eth-segment-00> expands t=
his definition and, so that virtual Ethernet Segments can be comprised of:=


*         Ethernet Virtual Circuits aggregated on an ENNI physical ports

*         Ethernet PWs or even MPLS LSPs.
Can you please clarify the following:

a.       How does the proposed YANG data model differentiate between physi=
cal and virtual Ethernet Segments?

b.       Does this data model cover the scenario where the virtual Etherne=
t segments are represented by EVCs?

5.       RFC 7432 includes recommendations for usage (or non-usage) of the=
 Control Word in the EVPN encapsulation, and RFC 8214 (which is claimed to=
 be covered by this draft) provides a control plane mechanism for exchangi=
ng the CW usage information. Can you please clarify whether the draft cove=
r usage of the CW in the EVPN encapsulations?
Your feedback will be highly appreciated.

Regards, and lots of thanks in advance,
Sasha

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


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--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" />
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</head>
<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal">Dear Editors of the <a href=3D"https://tools.ietf.o=
rg/html/draft-ietf-bess-evpn-yang-05">
EVPN YANG data model draft</a>,<o:p></o:p></p>
<p class=3D"MsoNormal">I have several questions regarding the draft, and w=
ould highly appreciated your responses.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l2 lev=
el1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">1.<span sty=
le=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;
</span></span><![endif]><span dir=3D"LTR"></span>The -05 version of the dr=
aft has expired almost two months ago. Do you plan to refresh it any time =
soon?<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l2 lev=
el1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">2.<span sty=
le=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;
</span></span><![endif]><span dir=3D"LTR"></span>The draft consistently us=
es type uint32 for the Ethernet segment identifier (ESI), while RFC 7432 e=
xplicitly defines it as a 10-octet integer. Is this just a typo, or did I =
miss something substantial here?<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l2 lev=
el1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">3.<span sty=
le=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;
</span></span><![endif]><span dir=3D"LTR"></span>The draft states that it =
covers Integrated Routing and Bridging in EVPN, but I could not find any t=
races of such coverage. Did I miss something, or is just a forward declara=
tion for the future version of the draft?<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l2 lev=
el1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">4.<span sty=
le=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;
</span></span><![endif]><span dir=3D"LTR"></span>RFC 7432 states that &#82=
20;When a customer site is connected to one or more PEs via a set of Ether=
net links, then this set of Ethernet links constitutes an Ethernet segment=
&quot;. The
<a href=3D"https://tools.ietf.org/html/draft-ietf-bess-evpn-virtual-eth-se=
gment-00">
Virtual Ethernet Segment draft</a> expands this definition and, so that vi=
rtual Ethernet Segments can be comprised of:<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l5 level2 lfo6">
<![if !supportLists]><span style=3D"font-family:Symbol"><span style=3D"mso=
-list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times New Roman&quot=
;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span>Ethernet Virtual C=
ircuits aggregated on an ENNI physical ports<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l5 level2 lfo6">
<![if !supportLists]><span style=3D"font-family:Symbol"><span style=3D"mso=
-list:Ignore">&middot;<span style=3D"font:7.0pt &quot;Times New Roman&quot=
;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span>Ethernet PWs or ev=
en MPLS LSPs.<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Can you please clarify=
 the following:<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l2 level2 lfo1">
<![if !supportLists]><span style=3D"mso-list:Ignore">a.<span style=3D"font=
:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]><span dir=3D"LTR"></span>How does the proposed YAN=
G data model differentiate between physical and virtual Ethernet Segments?=

<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l2 level2 lfo1">
<![if !supportLists]><span style=3D"mso-list:Ignore">b.<span style=3D"font=
:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]><span dir=3D"LTR"></span>Does this data model cove=
r the scenario where the virtual Ethernet segments are represented by EVCs=
?<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l2 lev=
el1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">5.<span sty=
le=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;
</span></span><![endif]><span dir=3D"LTR"></span>RFC 7432 includes recomme=
ndations for usage (or non-usage) of the Control Word in the EVPN encapsul=
ation, and RFC 8214 (which is claimed to be covered by this draft) provide=
s a control plane mechanism for exchanging
 the CW usage information. Can you please clarify whether the draft cover =
usage of the CW in the EVPN encapsulations?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p></o:p></p>
<p class=3D"MsoNormal">Your feedback will be highly appreciated.<o:p></o:p=
></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p><=
/p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Office: &#43;972-39266302<o:p></o:p></p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266=
302<o:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; Alexander.Vainshtein@ecitele.com=
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<br clear=3D"both">
__________________________________________________________________________=
_<BR>
<BR>
This e-mail message is intended for the recipient only and contains inform=
ation which is <BR>
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece=
ived this <BR>
transmission in error, please inform us by e-mail, phone or fax, and then =
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</html>

--_000_DB5PR0301MB19093856CE4495B879CAFD299DFB0DB5PR0301MB1909_--


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--_000_E8B3DC1140D245B09FF4738BA9C8BEF7ciscocom_--


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Matthew Bocci has requested publication of draft-ietf-bess-evpn-optimized-ir-06 as Proposed Standard on behalf of the BESS working group.

Please verify the document's state at https://datatracker.ietf.org/doc/draft-ietf-bess-evpn-optimized-ir/


From nobody Mon Oct 22 04:21:14 2018
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Subject: [bess] I-D Action: draft-ietf-bess-evpn-pref-df-02.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           : Preference-based EVPN DF Election
        Authors         : Jorge Rabadan
                          Senthil Sathappan
                          Tony Przygienda
                          Wen Lin
                          John Drake
                          Ali Sajassi
                          Satya Ranjan Mohanty
	Filename        : draft-ietf-bess-evpn-pref-df-02.txt
	Pages           : 13
	Date            : 2018-10-22

Abstract:
   The Designated Forwarder (DF) in (PBB-)EVPN networks is defined as
   the PE responsible for sending broadcast, multicast and unknown
   unicast traffic (BUM) to a multi-homed device/network in the case of
   an all-active multi-homing ES, or BUM and unicast in the case of
   single-active multi-homing.

   The DF is selected out of a candidate list of PEs that advertise the
   Ethernet Segment Identifier (ESI) to the EVPN network, according to
   the Default DF Election algorithm.

   While the Default Algorithm provides an efficient and automated way
   of selecting the DF across different EVIs or ISIDs in the ES, there
   are some use-cases where a more 'deterministic' and user-controlled
   method is required. At the same time, Service Providers require an
   easy way to force an on-demand DF switchover in order to carry out
   some maintenance tasks on the existing DF or control whether a new
   active PE can preempt the existing DF PE.

   This document proposes an extension to the Default DF election
   procedures so that the above requirements can be met.



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

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-bess-evpn-pref-df-02
https://datatracker.ietf.org/doc/html/draft-ietf-bess-evpn-pref-df-02

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-bess-evpn-pref-df-02


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

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


From nobody Mon Oct 22 05:29:44 2018
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From: <stephane.litkowski@orange.com>
To: "draft-ietf-bess-evpn-yang@ietf.org" <draft-ietf-bess-evpn-yang@ietf.org>,  "draft-ietf-bess-l2vpn-yang@ietf.org" <draft-ietf-bess-l2vpn-yang@ietf.org>,  "draft-ietf-bess-l3vpn-yang@ietf.org" <draft-ietf-bess-l3vpn-yang@ietf.org>
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Thread-Topic: LxVPN and EVPN yang models
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Date: Mon, 22 Oct 2018 12:29:21 +0000
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Subject: [bess] LxVPN and EVPN yang models
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--_000_9E32478DFA9976438E7A22F69B08FF924B3118F1OPEXCLILMA4corp_
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Hi Authors,


Speaking as individual, after reading the last versions of your module, I s=
till have several concerns about the consistency of the modeling across all=
 models.
There are common components between all the models that could be shared or =
at least modeled in the same way:

-          Model name: L3VPN uses ietf-bgp-l3vpn while others use ietf-evpn=
 or ietf-l2vpn

-          Route-target import/export and route-distinguisher:

o   Under bgp-parameters/common/rd-rt/ for EVPN

o   Under bgp-auto-discovery for L2VPN (that could make sense here but it i=
s weird in term of config consistency =3D> maybe better to have a bgp-auto-=
discovery Boolean or maybe the discovery-type is enough to know that bgp-au=
to-discovery is used ?)

o   Under ipv4 or ipv6 for l3vpn RTs but rd is at top level. That could mak=
e sense but again the configuration is slightly different from other AFI/SA=
FIs. Having different imp/exp for IPv4 and IPv6 is a valid use case, but yo=
u should also allow to have the same config for both without defining per A=
FI/SAFI config.

-          RIB route limits could also be modeled the same way

-          Modelization of route entries in the RIB could be modeled in the=
 same way across model

-          Attachment to the NI:

o   I don't understand how EVPN is integrated in L2VPN. It seems that you a=
dd a pointer (reference) to an EVPN instance which is in a completely diffe=
rent tree. That looks really strange and make EVPN instance configuration c=
ompletely different from an L3VPN instance or L2VPN instance. Do you plan t=
o reuse the config parameters from L2VPN or do you prefer creating a comple=
tely different tree ? If you prefer a completely different tree why not cre=
ating an EVPN ni-type ?


Can't we have one model defining some bgp-vpn containers possibly as a sepa=
rate module that could be reused across all models ?

Happy to hear your feedback.

Brgds,

Stephane


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<div class=3D"WordSection1">
<p class=3D"MsoNormal">Hi Authors,<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">Speaking as individual, after reading the last versi=
ons of your module, I still have several concerns about the consistency of =
the modeling across all models.
<o:p></o:p></p>
<p class=3D"MsoNormal">There are common components between all the models t=
hat could be shared or at least modeled in the same way:<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Model name: L3VPN uses ietf-bgp-l3vpn while others =
use ietf-evpn or ietf-l2vpn<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Route-target import/export and route-distinguisher:=
<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:1.0in;text-indent:-.25in=
;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style=3D"font-family:&quot;Courier New&quot;"><s=
pan style=3D"mso-list:Ignore">o<span style=3D"font:7.0pt &quot;Times New Ro=
man&quot;">&nbsp;&nbsp;
</span></span></span><![endif]>Under bgp-parameters/common/rd-rt/ for EVPN<=
o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:1.0in;text-indent:-.25in=
;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style=3D"font-family:&quot;Courier New&quot;"><s=
pan style=3D"mso-list:Ignore">o<span style=3D"font:7.0pt &quot;Times New Ro=
man&quot;">&nbsp;&nbsp;
</span></span></span><![endif]>Under bgp-auto-discovery for L2VPN (that cou=
ld make sense here but it is weird in term of config consistency =3D&gt; ma=
ybe better to have a bgp-auto-discovery Boolean or maybe the discovery-type=
 is enough to know that bgp-auto-discovery
 is used ?)<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:1.0in;text-indent:-.25in=
;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style=3D"font-family:&quot;Courier New&quot;"><s=
pan style=3D"mso-list:Ignore">o<span style=3D"font:7.0pt &quot;Times New Ro=
man&quot;">&nbsp;&nbsp;
</span></span></span><![endif]>Under ipv4 or ipv6 for l3vpn RTs but rd is a=
t top level. That could make sense but again the configuration is slightly =
different from other AFI/SAFIs. Having different imp/exp for IPv4 and IPv6 =
is a valid use case, but you should
 also allow to have the same config for both without defining per AFI/SAFI =
config.<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>RIB route limits could also be modeled the same way=
 <o:p>
</o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Modelization of route entries in the RIB could be m=
odeled in the same way across model
<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Attachment to the NI:<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:1.0in;text-indent:-.25in=
;mso-list:l0 level2 lfo1">
<![if !supportLists]><span style=3D"font-family:&quot;Courier New&quot;"><s=
pan style=3D"mso-list:Ignore">o<span style=3D"font:7.0pt &quot;Times New Ro=
man&quot;">&nbsp;&nbsp;
</span></span></span><![endif]>I don&#8217;t understand how EVPN is integra=
ted in L2VPN. It seems that you add a pointer (reference) to an EVPN instan=
ce which is in a completely different tree. That looks really strange and m=
ake EVPN instance configuration completely
 different from an L3VPN instance or L2VPN instance. Do you plan to reuse t=
he config parameters from L2VPN or do you prefer creating a completely diff=
erent tree ? If you prefer a completely different tree why not creating an =
EVPN ni-type ?<o:p></o:p></p>
<p class=3D"MsoListParagraph"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Can&#8217;t we have one model defining some bgp-vpn =
containers possibly as a separate module that could be reused across all mo=
dels ?<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Happy to hear your feedback.<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"><span style=3D"font-size:12.0pt;font-family:&quot;Ti=
mes New Roman&quot;,&quot;serif&quot;">Stephane</span><span lang=3D"FR" sty=
le=3D"font-size:12.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&=
quot;"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
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<PRE>______________________________________________________________________=
___________________________________________________

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From: <stephane.litkowski@orange.com>
To: "draft-ietf-bess-l3vpn-yang@ietf.org" <draft-ietf-bess-l3vpn-yang@ietf.org>, "bess@ietf.org" <bess@ietf.org>
Thread-Topic: Comments on L3VPN yang
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Date: Mon, 22 Oct 2018 13:24:35 +0000
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Subject: [bess] Comments on L3VPN yang
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Hi Authors,

Please find some comments on the current model:

-          I don't understand the "advertise-as-vpn" leaf under global-impo=
rts, what is the use case ?

-          Same question for "bgp-valid-route" leaf

-          Why do you have a long list of protocols within the global-impor=
ts ? Isn't it the goal of the route-policy referenced earlier ? Moreover I =
do not think that it is a good idea to use the enum type here as protocol n=
ames ,when referring to, should not change across all routing configuration=
s within a node.

-          Export to global may also require a policy to filter

-          Some description fields are just "."

-          How do you plan the tunnel policy to be used ?

-          Would be great to have RTs configurable for both IPv4/IPv6 witho=
ut redefining the config for each address family.

-          While I think the "forwarding-mode" under interface is a good th=
ing, it looks really a Cisco like config statement that other implementatio=
ns do not have. Wouldn't it be better  to have a knob to enable mpls packet=
 processing on an interface ; maybe in the MPLS yang model ?

-           What is the goal of the "route-policy" within "retain-route-tar=
gets" under the BGP peer AFI/SAFI ? I usually two use case (auto policy =3D=
> import RTs are derived from VRF configuration, or keep all), what is the =
use case you want to address here ?

-          What is the "vpn-prefix-limit" within "retain-route-targets" und=
er the BGP peer AFI/SAFI ? Is it a generic BGP prefix-limit ? If yes, we ne=
ed to keep it generic within the BGP model.

-          IMO, the label mode should sit within the VRF and not at the BGP=
 level. Each VRF may have a different flavor.

-          Why do you define bgp-label-mode and routing-table-limit for ipv=
4 unicast and ipv6 unicast ? Does not seem to be L3VPN related.

-          For iBGP PE-CE, notion of independent domain with attr-set usage=
 seems to miss in the model

-          Unequal cost path loadbalancing option is missing from the VRF c=
onfig

-          Do we need a config statement to enable local import/export betw=
een local VRFs ?

-          I suppose that IGP/BGP configuration in VRF is inherited from co=
re routing model.

-          Do you have to enrich routing policy model with ability to set/d=
elete/match RTs, SoOs ?

-          Do we have to create/enrich RIB-in/RIB-out/Loc-RIB entries for B=
GP L3VPN prefixes ?

-          What about PIC Edge/PE-CE link protection configuration ?

-          Need notification for the route table limit alert

-          Do we have operational states with number of IPv4 and IPv6 route=
s within the instance ?

-          Do we have everything to support Carrier's of Carrier case ?


Brgds,

Stephane


___________________________________________________________________________=
______________________________________________

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

This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;
they should not be distributed, used or copied without authorisation.
If you have received this email in error, please notify the sender and dele=
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<p class=3D"MsoNormal">Hi Authors,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Please find some comments on the current model:<o:p>=
</o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>I don&#8217;t understand the &#8220;advertise-as-vp=
n&#8221; leaf under global-imports, what is the use case ?<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Same question for &#8220;bgp-valid-route&#8221; lea=
f<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Why do you have a long list of protocols within the=
 global-imports ? Isn&#8217;t it the goal of the route-policy referenced ea=
rlier ? Moreover I do not think that it is a good idea to use the enum type=
 here as protocol names ,when referring
 to, should not change across all routing configurations within a node.<o:p=
></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Export to global may also require a policy to filte=
r<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Some description fields are just &#8220;.&#8221;<o:=
p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>How do you plan the tunnel policy to be used ?<o:p>=
</o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Would be great to have RTs configurable for both IP=
v4/IPv6 without redefining the config for each address family.<o:p></o:p></=
p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>While I think the &#8220;forwarding-mode&#8221; und=
er interface is a good thing, it looks really a Cisco like config statement=
 that other implementations do not have. Wouldn&#8217;t it be better &nbsp;=
to have a knob to enable mpls packet processing on an interface
 ; maybe in the MPLS yang model ?<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>&nbsp;What is the goal of the &#8220;route-policy&#=
8221; within &#8220;retain-route-targets&#8221; under the BGP peer AFI/SAFI=
 ? I usually two use case (auto policy =3D&gt; import RTs are derived from =
VRF configuration, or keep all), what is the use case you want to
 address here ?<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>What is the &#8220;vpn-prefix-limit&#8221; within &=
#8220;retain-route-targets&#8221; under the BGP peer AFI/SAFI ? Is it a gen=
eric BGP prefix-limit ? If yes, we need to keep it generic within the BGP m=
odel.<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>IMO, the label mode should sit within the VRF and n=
ot at the BGP level. Each VRF may have a different flavor.<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Why do you define bgp-label-mode and routing-table-=
limit for ipv4 unicast and ipv6 unicast ? Does not seem to be L3VPN related=
.<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>For iBGP PE-CE, notion of independent domain with a=
ttr-set usage seems to miss in the model<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Unequal cost path loadbalancing option is missing f=
rom the VRF config<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Do we need a config statement to enable local impor=
t/export between local VRFs ?<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>I suppose that IGP/BGP configuration in VRF is inhe=
rited from core routing model.<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Do you have to enrich routing policy model with abi=
lity to set/delete/match RTs, SoOs ?<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Do we have to create/enrich RIB-in/RIB-out/Loc-RIB =
entries for BGP L3VPN prefixes ?
<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>What about PIC Edge/PE-CE link protection configura=
tion ?<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Need notification for the route table limit alert <=
o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Do we have operational states with number of IPv4 a=
nd IPv6 routes within the instance ?<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Do we have everything to support Carrier&#8217;s of=
 Carrier case ?
<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"><span style=3D"font-size:12.0pt;font-family:&quot;Ti=
mes New Roman&quot;,&quot;serif&quot;">Brgds,<o:p></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<o:p></o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<PRE>______________________________________________________________________=
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From: <stephane.litkowski@orange.com>
To: "Ali Sajassi (sajassi)" <sajassi@cisco.com>, "Jakob Heitz (jheitz)" <jheitz@cisco.com>, Zhuangshunwan <zhuangshunwan@huawei.com>, BESS <bess@ietf.org>
Thread-Topic: [bess] Encoding a 20 bit label in a 24 bit field.
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Subject: Re: [bess] Encoding a 20 bit label in a 24 bit field.
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "draft-ietf-bess-l3vpn-yang@ietf.org" <draft-ietf-bess-l3vpn-yang@ietf.org>, "bess@ietf.org" <bess@ietf.org>, "stephane.litkowski@orange.com" <stephane.litkowski@orange.com>
Thread-Topic: Comments on L3VPN yang
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Date: Mon, 22 Oct 2018 13:50:43 +0000
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Subject: Re: [bess] Comments on L3VPN yang
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Hi all,
I fully agree with Stephane's point "the label mode should sit within the =
VRF and not at the BGP level. Each VRF may have a different flavor".  One =
relevant use case is the VRF that provides inet-subnet forwarding i EVPN w=
ith Symmetric IRB - it must use per-VRF label allocation policy with the l=
abel in question being advertised ad Label2 in MAC/IP Advertisement routes=
 rgardless of how other VRFs allocate their labels.

My 2c.

Thumb typed by Sasha Vainshtein

________________________________
From: BESS <bess-bounces@ietf.org> on behalf of stephane.litkowski@orange.=
com <stephane.litkowski@orange.com>
Sent: Monday, October 22, 2018 4:24:35 PM
To: draft-ietf-bess-l3vpn-yang@ietf.org; bess@ietf.org
Subject: [bess] Comments on L3VPN yang

Hi Authors,

Please find some comments on the current model:

-          I don=92t understand the =93advertise-as-vpn=94 leaf under glob=
al-imports, what is the use case ?

-          Same question for =93bgp-valid-route=94 leaf

-          Why do you have a long list of protocols=20within the global-im=
ports ? Isn=92t it the goal of the route-policy referenced earlier ? Moreo=
ver I do not think that it is a good idea to use the enum type here as pro=
tocol names ,when referring to, should not change across all routing confi=
gurations within a node.

-          Export to global may also require a policy to filter

-          Some description fields are just =93.=94

-          How do you plan the tunnel policy to be used ?

-          Would be great to have RTs configurable for both IPv4/IPv6 with=
out redefining the config for each address family.

-          While I think the =93forwarding-mode=94 under interface is a go=
od thing, it looks really a Cisco like config statement that other impleme=
ntations do not have. Wouldn=92t it be better  to have a knob to enable mp=
ls packet processing on an interface ; maybe in the MPLS yang model ?

-           What is the goal of the =93route-policy=94 within =93retain-ro=
ute-targets=94 under the BGP peer AFI/SAFI ? I usually two use case (auto =
policy =3D> import RTs are derived from VRF configuration, or keep all), w=
hat is the use case you want to address here ?

-          What is the =93vpn-prefix-limit=94 within =93retain-route-targe=
ts=94 under the BGP peer AFI/SAFI ? Is it a generic BGP prefix-limit ? If =
yes, we need to keep it generic within the BGP model.

-          IMO, the label mode should sit within the VRF and not at the BG=
P level. Each VRF may have a different flavor.

-          Why do you define bgp-label-mode and routing-table-limit for ip=
v4 unicast and ipv6 unicast ? Does not seem to be L3VPN related..

-          For iBGP PE-CE, notion of independent domain with attr-set usag=
e seems to miss in the model

-          Unequal cost path loadbalancing option is missing from the VRF =
config

-          Do we need a config statement to enable local import/export bet=
ween local VRFs ?

-          I suppose that IGP/BGP configuration in VRF is inherited from c=
ore routing model.

-          Do you have to enrich routing policy model with ability to set/=
delete/match RTs, SoOs ?

- =20        Do we have to create/enrich RIB-in/RIB-out/Loc-RIB entries fo=
r BGP L3VPN prefixes ?

-          What about PIC Edge/PE-CE link protection configuration ?

-          Need notification for the route table limit alert

-          Do we have operational states with number of IPv4 and IPv6 rout=
es within the instance ?

-          Do we have everything to support Carrier=92s of Carrier case ?


Brgds,

Stephane


__________________________________________________________________________=
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<div dir=3D"auto" style=3D"direction:ltr; margin:0; padding:0; font-family=
:sans-serif; font-size:11pt; color:black">
Hi all,<br>
</div>
<div dir=3D"auto" style=3D"direction:ltr; margin:0; padding:0; font-family=
:sans-serif; font-size:11pt; color:black">
I fully agree with Stephane's point &quot;the label mode should sit within=
 the VRF and not at the BGP level. Each VRF may have a different flavor&qu=
ot;.&nbsp; One relevant use case is the VRF that provides inet-subnet forw=
arding i EVPN with Symmetric IRB - it must use per-VRF
 label allocation policy with the label in question being advertised ad La=
bel2 in MAC/IP Advertisement routes rgardless of how other VRFs allocate t=
heir labels.<br>
<br>
</div>
<div dir=3D"auto" style=3D"direction:ltr; margin:0; padding:0; font-family=
:sans-serif; font-size:11pt; color:black">
My 2c.<br>
<br>
</div>
<div dir=3D"auto" style=3D"direction:ltr; margin:0; padding:0; font-family=
:sans-serif; font-size:11pt; color:black">
<div dir=3D"auto" style=3D"direction:ltr; margin:0; padding:0; font-family=
:sans-serif; font-size:11pt; color:black">
Thumb typed by Sasha Vainshtein</div>
<br>
</div>
<hr tabindex=3D"-1" style=3D"display:inline-block; width:98%">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" c=
olor=3D"#000000" style=3D"font-size:11pt"><b>From:</b> BESS &lt;bess-bounc=
es@ietf.org&gt; on behalf of stephane.litkowski@orange.com &lt;stephane.li=
tkowski@orange.com&gt;<br>
<b>Sent:</b> Monday, October 22, 2018 4:24:35 PM<br>
<b>To:</b> draft-ietf-bess-l3vpn-yang@ietf.org; bess@ietf.org<br>
<b>Subject:</b> [bess] Comments on L3VPN yang</font>
<div>&nbsp;</div>
</div>
<div>
<div class=3D"WordSection1">
<p class=3D"MsoNormal">Hi Authors,</p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">Please find some comments on the current model:</p>=

<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in"><span style=3D"=
">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span>I don=92t understand the =93advertise-as-vpn=94 leaf under g=
lobal-imports, what is the use case ?</p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in"><span style=3D"=
">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span>Same question for =93bgp-valid-route=94 leaf</p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in"><span style=3D"=
">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span>Why do you have a long list of protocols within the global-i=
mports ? Isn=92t it the goal of the route-policy referenced earlier ? More=
over I do not think that it is a good idea to use the enum type here as pr=
otocol names ,when referring to, should
 not change across all routing configurations within a node.</p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in"><span style=3D"=
">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span>Export to global may also require a policy to filter</p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in"><span style=3D"=
">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span>Some description fields are just =93.=94</p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in"><span style=3D"=
">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span>How do you plan the tunnel policy to be used ?</p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in"><span style=3D"=
">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span>Would be great to have RTs configurable for both IPv4/IPv6 w=
ithout redefining the config for each address family.</p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in"><span style=3D"=
">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span>While I think the =93forwarding-mode=94 under interface is a=
 good thing, it looks really a Cisco like config statement that other impl=
ementations do not have. Wouldn=92t it be better &nbsp;to have a knob to e=
nable mpls packet processing on an interface ;
 maybe in the MPLS yang model ?</p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in"><span style=3D"=
">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span>&nbsp;What is the goal of the =93route-policy=94 within =93r=
etain-route-targets=94 under the BGP peer AFI/SAFI ? I usually two use cas=
e (auto policy =3D&gt; import RTs are derived from VRF configuration, or k=
eep all), what is the use case you want to address here
 ?</p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in"><span style=3D"=
">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span>What is the =93vpn-prefix-limit=94 within =93retain-route-ta=
rgets=94 under the BGP peer AFI/SAFI ? Is it a generic BGP prefix-limit ? =
If yes, we need to keep it generic within the BGP model.</p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in"><span style=3D"=
">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span>IMO, the label mode should sit within the VRF and not at the=
 BGP level. Each VRF may have a different flavor.</p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in"><span style=3D"=
">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span>Why do you define bgp-label-mode and routing-table-limit for=
 ipv4 unicast and ipv6 unicast ? Does not seem to be L3VPN related..</p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in"><span style=3D"=
">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span>For iBGP PE-CE, notion of independent domain with attr-set u=
sage seems to miss in the model</p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in"><span style=3D"=
">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span>Unequal cost path loadbalancing option is missing from the V=
RF config</p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in"><span style=3D"=
">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span>Do we need a config statement to enable local import/export =
between local VRFs ?</p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in"><span style=3D"=
">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span>I suppose that IGP/BGP configuration in=20VRF is inherited f=
rom core routing model.</p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in"><span style=3D"=
">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span>Do you have to enrich routing policy model with ability to s=
et/delete/match RTs, SoOs ?</p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in"><span style=3D"=
">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span>Do we have to create/enrich RIB-in/RIB-out/Loc-RIB entries f=
or BGP L3VPN prefixes ?
</p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in"><span style=3D"=
">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span>What about PIC Edge/PE-CE link protection configuration ?</p=
>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in"><span style=3D"=
">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span>Need notification for the route table limit alert </p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in"><span style=3D"=
">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span>Do we have operational states with number of IPv4 and IPv6 r=
outes within the instance ?</p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in"><span style=3D"=
">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span>Do we have everything to support Carrier=92s of Carrier case=
 ? </p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal">&nbsp;</p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt; font-family:&quot;=
Times New Roman&quot;,&quot;serif&quot;">Brgds,</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt; font-family:&quot;=
Times New Roman&quot;,&quot;serif&quot;">&nbsp;</span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt; font-family:&quot;=
Times New Roman&quot;,&quot;serif&quot;">Stephane</span></p>
<p class=3D"MsoNormal">&nbsp;</p>
</div>
<pre>_____________________________________________________________________=
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From: <stephane.litkowski@orange.com>
To: LITKOWSKI Stephane OBS/OINIS <stephane.litkowski@orange.com>, "draft-ietf-bess-l3vpn-yang@ietf.org" <draft-ietf-bess-l3vpn-yang@ietf.org>, "bess@ietf.org" <bess@ietf.org>
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Subject: Re: [bess] Comments on L3VPN yang
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I'm also wondering if the RPF should not sit in the MPLS module as it could=
 be used for any types of labels advertised to a neighbor.

From: BESS [mailto:bess-bounces@ietf.org] On Behalf Of stephane.litkowski@o=
range.com
Sent: Monday, October 22, 2018 15:25
To: draft-ietf-bess-l3vpn-yang@ietf.org; bess@ietf.org
Subject: [bess] Comments on L3VPN yang

Hi Authors,

Please find some comments on the current model:

-          I don't understand the "advertise-as-vpn" leaf under global-impo=
rts, what is the use case ?

-          Same question for "bgp-valid-route" leaf

-          Why do you have a long list of protocols within the global-impor=
ts ? Isn't it the goal of the route-policy referenced earlier ? Moreover I =
do not think that it is a good idea to use the enum type here as protocol n=
ames ,when referring to, should not change across all routing configuration=
s within a node.

-          Export to global may also require a policy to filter

-          Some description fields are just "."

-          How do you plan the tunnel policy to be used ?

-          Would be great to have RTs configurable for both IPv4/IPv6 witho=
ut redefining the config for each address family.

-          While I think the "forwarding-mode" under interface is a good th=
ing, it looks really a Cisco like config statement that other implementatio=
ns do not have. Wouldn't it be better  to have a knob to enable mpls packet=
 processing on an interface ; maybe in the MPLS yang model ?

-           What is the goal of the "route-policy" within "retain-route-tar=
gets" under the BGP peer AFI/SAFI ? I usually two use case (auto policy =3D=
> import RTs are derived from VRF configuration, or keep all), what is the =
use case you want to address here ?

-          What is the "vpn-prefix-limit" within "retain-route-targets" und=
er the BGP peer AFI/SAFI ? Is it a generic BGP prefix-limit ? If yes, we ne=
ed to keep it generic within the BGP model.

-          IMO, the label mode should sit within the VRF and not at the BGP=
 level. Each VRF may have a different flavor.

-          Why do you define bgp-label-mode and routing-table-limit for ipv=
4 unicast and ipv6 unicast ? Does not seem to be L3VPN related..

-          For iBGP PE-CE, notion of independent domain with attr-set usage=
 seems to miss in the model

-          Unequal cost path loadbalancing option is missing from the VRF c=
onfig

-          Do we need a config statement to enable local import/export betw=
een local VRFs ?

-          I suppose that IGP/BGP configuration in VRF is inherited from co=
re routing model.

-          Do you have to enrich routing policy model with ability to set/d=
elete/match RTs, SoOs ?

-          Do we have to create/enrich RIB-in/RIB-out/Loc-RIB entries for B=
GP L3VPN prefixes ?

-          What about PIC Edge/PE-CE link protection configuration ?

-          Need notification for the route table limit alert

-          Do we have operational states with number of IPv4 and IPv6 route=
s within the instance ?

-          Do we have everything to support Carrier's of Carrier case ?


Brgds,

Stephane


___________________________________________________________________________=
______________________________________________



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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I&#8217;m also wonderi=
ng if the RPF should not sit in the MPLS module as it could be used for any=
 types of labels advertised to a neighbor.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Tahoma&quot;,&quot;sans-serif&quot;">From:</span></b><span style=3D"font-s=
ize:10.0pt;font-family:&quot;Tahoma&quot;,&quot;sans-serif&quot;"> BESS [ma=
ilto:bess-bounces@ietf.org]
<b>On Behalf Of </b>stephane.litkowski@orange.com<br>
<b>Sent:</b> Monday, October 22, 2018 15:25<br>
<b>To:</b> draft-ietf-bess-l3vpn-yang@ietf.org; bess@ietf.org<br>
<b>Subject:</b> [bess] Comments on L3VPN yang<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Hi Authors,<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Please find some comments on the current model:<o:p>=
</o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo2"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>I don&#8217;t understand the &#8220;advertise-as-vp=
n&#8221; leaf under global-imports, what is the use case ?<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo2"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Same question for &#8220;bgp-valid-route&#8221; lea=
f<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo2"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Why do you have a long list of protocols within the=
 global-imports ? Isn&#8217;t it the goal of the route-policy referenced ea=
rlier ? Moreover I do not think that it is a good idea to use the enum type=
 here as protocol names ,when referring
 to, should not change across all routing configurations within a node.<o:p=
></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo2"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Export to global may also require a policy to filte=
r<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo2"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Some description fields are just &#8220;.&#8221;<o:=
p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo2"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>How do you plan the tunnel policy to be used ?<o:p>=
</o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo2"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Would be great to have RTs configurable for both IP=
v4/IPv6 without redefining the config for each address family.<o:p></o:p></=
p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo2"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>While I think the &#8220;forwarding-mode&#8221; und=
er interface is a good thing, it looks really a Cisco like config statement=
 that other implementations do not have. Wouldn&#8217;t it be better &nbsp;=
to have a knob to enable mpls packet processing on an interface
 ; maybe in the MPLS yang model ?<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo2"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>&nbsp;What is the goal of the &#8220;route-policy&#=
8221; within &#8220;retain-route-targets&#8221; under the BGP peer AFI/SAFI=
 ? I usually two use case (auto policy =3D&gt; import RTs are derived from =
VRF configuration, or keep all), what is the use case you want to
 address here ?<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo2"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>What is the &#8220;vpn-prefix-limit&#8221; within &=
#8220;retain-route-targets&#8221; under the BGP peer AFI/SAFI ? Is it a gen=
eric BGP prefix-limit ? If yes, we need to keep it generic within the BGP m=
odel.<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo2"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>IMO, the label mode should sit within the VRF and n=
ot at the BGP level. Each VRF may have a different flavor.<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo2"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Why do you define bgp-label-mode and routing-table-=
limit for ipv4 unicast and ipv6 unicast ? Does not seem to be L3VPN related=
..<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo2"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>For iBGP PE-CE, notion of independent domain with a=
ttr-set usage seems to miss in the model<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo2"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Unequal cost path loadbalancing option is missing f=
rom the VRF config<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo2"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Do we need a config statement to enable local impor=
t/export between local VRFs ?<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo2"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>I suppose that IGP/BGP configuration in VRF is inhe=
rited from core routing model.<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo2"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Do you have to enrich routing policy model with abi=
lity to set/delete/match RTs, SoOs ?<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo2"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Do we have to create/enrich RIB-in/RIB-out/Loc-RIB =
entries for BGP L3VPN prefixes ?
<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo2"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>What about PIC Edge/PE-CE link protection configura=
tion ?<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo2"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Need notification for the route table limit alert <=
o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo2"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Do we have operational states with number of IPv4 a=
nd IPv6 routes within the instance ?<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo2"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>Do we have everything to support Carrier&#8217;s of=
 Carrier case ?
<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"><span style=3D"font-size:12.0pt;font-family:&quot;Ti=
mes New Roman&quot;,&quot;serif&quot;">Brgds,<o:p></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<o:p></o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre>______________________________________________________________________=
___________________________________________________<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>Ce message et ses pieces jointes peuvent contenir des informations con=
fidentielles ou privilegiees et ne doivent donc<o:p></o:p></pre>
<pre>pas etre diffuses, exploites ou copies sans autorisation. Si vous avez=
 recu ce message par erreur, veuillez le signaler<o:p></o:p></pre>
<pre>a l'expediteur et le detruire ainsi que les pieces jointes. Les messag=
es electroniques etant susceptibles d'alteration,<o:p></o:p></pre>
<pre>Orange decline toute responsabilite si ce message a ete altere, deform=
e ou falsifie. Merci.<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>This message and its attachments may contain confidential or privilege=
d information that may be protected by law;<o:p></o:p></pre>
<pre>they should not be distributed, used or copied without authorisation.<=
o:p></o:p></pre>
<pre>If you have received this email in error, please notify the sender and=
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<pre>As emails may be altered, Orange is not liable for messages that have =
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<pre>Thank you.<o:p></o:p></pre>
</div>
<PRE>______________________________________________________________________=
___________________________________________________

Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler
a l'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 =
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Thank you.
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From: "Acee Lindem (acee)" <acee@cisco.com>
To: "stephane.litkowski@orange.com" <stephane.litkowski@orange.com>, "Ali Sajassi (sajassi)" <sajassi@cisco.com>, "Jakob Heitz (jheitz)" <jheitz@cisco.com>, Zhuangshunwan <zhuangshunwan@huawei.com>, BESS <bess@ietf.org>
Thread-Topic: [bess] Encoding a 20 bit label in a 24 bit field.
Thread-Index: AQHUZXXQJjltMMJnZEWkdYDWEEilsqUrk7IA///QnQA=
Date: Mon, 22 Oct 2018 14:57:57 +0000
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Subject: Re: [bess] Encoding a 20 bit label in a 24 bit field.
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From nobody Mon Oct 22 10:32:01 2018
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Subject: [bess] I-D Action: draft-ietf-bess-l2vpn-yang-09.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           : YANG Data Model for MPLS-based L2VPN
        Authors         : Himanshu Shah
                          Patrice Brissette
                          Ing-When Chen
                          Iftekar Hussain
                          Bin Wen
                          Kishore Tiruveedhula
	Filename        : draft-ietf-bess-l2vpn-yang-09.txt
	Pages           : 48
	Date            : 2018-10-22

Abstract:
   This document describes a YANG data model for Layer 2 VPN (L2VPN)
   services over MPLS networks.  These services include point-to-point
   Virtual Private Wire Service (VPWS) and multipoint Virtual Private
   LAN service (VPLS) that uses LDP and BGP signaled Pseudowires.  It is
   expected that this model will be used by the management tools run by
   the network operators in order to manage and monitor the network
   resources that they use to deliver L2VPN services.

   This document also describes the YANG data model for the Pseudowires.
   The independent definition of the Pseudowires facilitates its use in
   Ethernet Segment and EVPN data models defined in separate document.


The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-ietf-bess-l2vpn-yang/

There are also htmlized versions available at:
https://tools.ietf.org/html/draft-ietf-bess-l2vpn-yang-09
https://datatracker.ietf.org/doc/html/draft-ietf-bess-l2vpn-yang-09

A diff from the previous version is available at:
https://www.ietf.org/rfcdiff?url2=draft-ietf-bess-l2vpn-yang-09


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: "Jakob Heitz (jheitz)" <jheitz@cisco.com>
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From nobody Mon Oct 22 13:27:34 2018
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Subject: [bess] I-D Action: draft-ietf-bess-evpn-yang-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           : Yang Data Model for EVPN
        Authors         : Patrice Brissette
                          Himanshu Shah
                          Iftekar Hussain
                          Kishore Tiruveedhula
                          Jorge Rabadan
	Filename        : draft-ietf-bess-evpn-yang-06.txt
	Pages           : 28
	Date            : 2018-10-22

Abstract:
   This document describes a YANG data model for Ethernet VPN services.
   The model is agnostic of the underlay. It apply to MPLS as well as to
   VxLAN encapsulation. The model is also agnostic of the services
   including E-LAN, E-LINE and E-TREE services. This document mainly
   focuses on EVPN and Ethernet-Segment instance framework.


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

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

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


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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Mon, 22 Oct 2018 15:07:39 -0700
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To: Stephane Litkowski <stephane.litkowski@orange.com>
Cc: "Ali Sajassi (sajassi)" <sajassi@cisco.com>, "Jakob Heitz (jheitz)" <jheitz@cisco.com>, zhuangshunwan@huawei.com,  BESS <bess@ietf.org>
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Subject: Re: [bess] Encoding a 20 bit label in a 24 bit field.
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--000000000000f5858b0578d87b2a
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Hi Stephane,
should note that "setting the MPLS Label field to zero" may be also
interpreted as a valid label, IPv4 Explicit Null Label.

Regards,
Greg

On Mon, Oct 22, 2018 at 6:47 AM <stephane.litkowski@orange.com> wrote:

> Hi,
>
> Does anyone disagree with the additional Jakob's statement proposal ?
> " The lower order 4 bits SHOULD be sent as 0 and ignored on receipt."
>
> As an example, in MVPN for PMSI tunnel attribute, we have the following
> statement which does not tell anything about the lower order bits:
> " If the MPLS Label field is non-zero, then it contains an MPLS label
>    encoded as 3 octets, where the high-order 20 bits contain the label
>    value.  Absence of an MPLS Label is indicated by setting the MPLS
>    Label field to zero."
>
>
> Brgds,
>
>
> -----Original Message-----
> From: BESS [mailto:bess-bounces@ietf.org] On Behalf Of Ali Sajassi
> (sajassi)
> Sent: Tuesday, October 16, 2018 19:30
> To: Jakob Heitz (jheitz); Zhuangshunwan; BESS
> Subject: Re: [bess] Encoding a 20 bit label in a 24 bit field.
>
>
> Yes, just the encoding of label value needs to be clear.
>
> Cheers,
> Ali
>
>
>
> =EF=BB=BFOn 10/15/18, 6:24 PM, "BESS on behalf of Jakob Heitz (jheitz)" <
> bess-bounces@ietf.org on behalf of jheitz@cisco.com> wrote:
>
>     How about:
>     The lower order 4 bits SHOULD be sent as 0 and ignored on receipt.
>
>     Regards,
>     Jakob.
>
>
>     -----Original Message-----
>     From: Zhuangshunwan <zhuangshunwan@huawei.com>
>     Sent: Monday, October 15, 2018 6:02 PM
>     To: Jakob Heitz (jheitz) <jheitz@cisco.com>; BESS <bess@ietf.org>
>     Subject: RE: Encoding a 20 bit label in a 24 bit field.
>
>     It is good to make this explicit. This ambiguity has led to some
> unnecessary interworking problems.
>
>     Should we also need to explicitly define the "bottom of stack" bit in
> the low-order bit of the 3-octet label field?
>
>     Thanks,
>     Shunwan
>
>     -----Original Message-----
>     From: BESS [mailto:bess-bounces@ietf.org] On Behalf Of Jakob Heitz
> (jheitz)
>     Sent: Tuesday, October 16, 2018 4:21 AM
>     To: BESS <bess@ietf.org>
>     Subject: [bess] Encoding a 20 bit label in a 24 bit field.
>
>     We have proposed the following erratum for RFC 7432.
>
>     Opinions?
>
>     Regards,
>     Jakob.
>
>
>     -----Original Message-----
>     From: RFC Errata System <rfc-editor@rfc-editor.org>
>     Sent: Friday, October 12, 2018 12:37 PM
>     To: Ali Sajassi (sajassi) <sajassi@cisco.com>; raggarwa_1@yahoo.com;
> nabil.n.bitar@verizon.com; aisaac71@bloomberg.net; uttaro@att.com;
> jdrake@juniper.net; wim.henderickx@alcatel-lucent.com; db3546@att.com;
> aretana.ietf@gmail.com; martin.vigoureux@nokia.com; Giles Heron (giheron)
> <giheron@cisco.com>; nabil.n.bitar@verizon.com
>     Cc: Krishnamoorthy Arumugham (karumugh) <karumugh@cisco.com>;
> l2vpn@ietf.org; rfc-editor@rfc-editor.org
>     Subject: [Technical Errata Reported] RFC7432 (5523)
>
>     The following errata report has been submitted for RFC7432, "BGP
> MPLS-Based Ethernet VPN".
>
>     --------------------------------------
>     You may review the report below and at:
>     http://www.rfc-editor.org/errata/eid5523
>
>     --------------------------------------
>     Type: Technical
>     Reported by: Krishnamoorthy Arumugham <karumugh@cisco.com>
>
>     Section: 7
>
>     Original Text
>     -------------
>     Clarifications to following sub-sections:
>     Section 7.1
>     Section 7.2
>     Section 7.5
>
>
>     Corrected Text
>     --------------
>     Section 7.1:
>     Add below text to the section 7.1 regarding the encoding of MPLS labe=
l:
>
>     "The value of the 20-bit MPLS label is encoded in the high-order 20
> bits of the 3 bytes MPLS Label field."
>
>     Section 7.2:
>     Add below text to the section 7.2 regarding the encoding of both the
> MPLS label fields:
>
>     "The value of the 20-bit MPLS label is encoded in the high-order 20
> bits of the 3 bytes MPLS Label field for both MPLS Label1 and MPLS Label2=
."
>
>     Section 7.5:
>     Add below text to the section 7.5 regarding the encoding of ESI Label
> fields:
>
>     "The value of the 20-bit MPLS label is encoded in the high-order 20
> bits of the ESI Label field."
>
>
>     Notes
>     -----
>     MPLS label is a 20-bit value and is stored in a 3 bytes field in a
> packet. The 20-bit MPLS label value is generally stored in higher order 2=
0
> bits of the 3 byte label field. The exact encoding to be followed for
> storing MPLS label values are not explicitly mentioned in the RFC 7432
> under section 7.1, 7.2 and 7.5 for different types of EVPN routes. This
> lead to ambiguity in different implementations. Hence a clarification is
> required.
>
>     Instructions:
>     -------------
>     This erratum is currently posted as "Reported". If necessary, please
>     use "Reply All" to discuss whether it should be verified or
>     rejected. When a decision is reached, the verifying party
>     can log in to change the status and edit the report, if necessary.
>
>     --------------------------------------
>     RFC7432 (draft-ietf-l2vpn-evpn-11)
>     --------------------------------------
>     Title               : BGP MPLS-Based Ethernet VPN
>     Publication Date    : February 2015
>     Author(s)           : A. Sajassi, Ed., R. Aggarwal, N. Bitar, A.
> Isaac, J. Uttaro, J. Drake, W. Henderickx
>     Category            : PROPOSED STANDARD
>     Source              : Layer 2 Virtual Private Networks
>     Area                : Routing
>     Stream              : IETF
>     Verifying Party     : IESG
>
>     _______________________________________________
>     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
>
>
> _______________________________________________
> BESS mailing list
> BESS@ietf.org
> https://www.ietf.org/mailman/listinfo/bess
>
>
> _________________________________________________________________________=
________________________________________________
>
> 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 o=
u
> 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 bee=
n
> modified, changed or falsified.
> Thank you.
>
> _______________________________________________
> BESS mailing list
> BESS@ietf.org
> https://www.ietf.org/mailman/listinfo/bess
>

--000000000000f5858b0578d87b2a
Content-Type: text/html; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable

<div dir=3D"ltr">Hi Stephane,<div>should note that &quot;setting the MPLS L=
abel field to zero&quot; may be also interpreted=C2=A0as a valid label, IPv=
4 Explicit Null Label.</div><div><br></div><div>Regards,</div><div>Greg</di=
v></div><br><div class=3D"gmail_quote"><div dir=3D"ltr">On Mon, Oct 22, 201=
8 at 6:47 AM &lt;<a href=3D"mailto:stephane.litkowski@orange.com">stephane.=
litkowski@orange.com</a>&gt; wrote:<br></div><blockquote class=3D"gmail_quo=
te" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"=
>Hi,<br>
<br>
Does anyone disagree with the additional Jakob&#39;s statement proposal ?<b=
r>
&quot; The lower order 4 bits SHOULD be sent as 0 and ignored on receipt.&q=
uot;<br>
<br>
As an example, in MVPN for PMSI tunnel attribute, we have the following sta=
tement which does not tell anything about the lower order bits:<br>
&quot; If the MPLS Label field is non-zero, then it contains an MPLS label<=
br>
=C2=A0 =C2=A0encoded as 3 octets, where the high-order 20 bits contain the =
label<br>
=C2=A0 =C2=A0value.=C2=A0 Absence of an MPLS Label is indicated by setting =
the MPLS<br>
=C2=A0 =C2=A0Label field to zero.&quot;<br>
<br>
<br>
Brgds,<br>
<br>
<br>
-----Original Message-----<br>
From: BESS [mailto:<a href=3D"mailto:bess-bounces@ietf.org" target=3D"_blan=
k">bess-bounces@ietf.org</a>] On Behalf Of Ali Sajassi (sajassi)<br>
Sent: Tuesday, October 16, 2018 19:30<br>
To: Jakob Heitz (jheitz); Zhuangshunwan; BESS<br>
Subject: Re: [bess] Encoding a 20 bit label in a 24 bit field.<br>
<br>
<br>
Yes, just the encoding of label value needs to be clear. <br>
<br>
Cheers,<br>
Ali<br>
<br>
<br>
<br>
=EF=BB=BFOn 10/15/18, 6:24 PM, &quot;BESS on behalf of Jakob Heitz (jheitz)=
&quot; &lt;<a href=3D"mailto:bess-bounces@ietf.org" target=3D"_blank">bess-=
bounces@ietf.org</a> on behalf of <a href=3D"mailto:jheitz@cisco.com" targe=
t=3D"_blank">jheitz@cisco.com</a>&gt; wrote:<br>
<br>
=C2=A0 =C2=A0 How about:<br>
=C2=A0 =C2=A0 The lower order 4 bits SHOULD be sent as 0 and ignored on rec=
eipt.<br>
<br>
=C2=A0 =C2=A0 Regards,<br>
=C2=A0 =C2=A0 Jakob.<br>
<br>
<br>
=C2=A0 =C2=A0 -----Original Message-----<br>
=C2=A0 =C2=A0 From: Zhuangshunwan &lt;<a href=3D"mailto:zhuangshunwan@huawe=
i.com" target=3D"_blank">zhuangshunwan@huawei.com</a>&gt; <br>
=C2=A0 =C2=A0 Sent: Monday, October 15, 2018 6:02 PM<br>
=C2=A0 =C2=A0 To: Jakob Heitz (jheitz) &lt;<a href=3D"mailto:jheitz@cisco.c=
om" target=3D"_blank">jheitz@cisco.com</a>&gt;; BESS &lt;<a href=3D"mailto:=
bess@ietf.org" target=3D"_blank">bess@ietf.org</a>&gt;<br>
=C2=A0 =C2=A0 Subject: RE: Encoding a 20 bit label in a 24 bit field.<br>
<br>
=C2=A0 =C2=A0 It is good to make this explicit. This ambiguity has led to s=
ome unnecessary interworking problems.<br>
<br>
=C2=A0 =C2=A0 Should we also need to explicitly define the &quot;bottom of =
stack&quot; bit in the low-order bit of the 3-octet label field?<br>
<br>
=C2=A0 =C2=A0 Thanks,<br>
=C2=A0 =C2=A0 Shunwan<br>
<br>
=C2=A0 =C2=A0 -----Original Message-----<br>
=C2=A0 =C2=A0 From: BESS [mailto:<a href=3D"mailto:bess-bounces@ietf.org" t=
arget=3D"_blank">bess-bounces@ietf.org</a>] On Behalf Of Jakob Heitz (jheit=
z)<br>
=C2=A0 =C2=A0 Sent: Tuesday, October 16, 2018 4:21 AM<br>
=C2=A0 =C2=A0 To: BESS &lt;<a href=3D"mailto:bess@ietf.org" target=3D"_blan=
k">bess@ietf.org</a>&gt;<br>
=C2=A0 =C2=A0 Subject: [bess] Encoding a 20 bit label in a 24 bit field.<br=
>
<br>
=C2=A0 =C2=A0 We have proposed the following erratum for RFC 7432.<br>
<br>
=C2=A0 =C2=A0 Opinions?<br>
<br>
=C2=A0 =C2=A0 Regards,<br>
=C2=A0 =C2=A0 Jakob.<br>
<br>
<br>
=C2=A0 =C2=A0 -----Original Message-----<br>
=C2=A0 =C2=A0 From: RFC Errata System &lt;<a href=3D"mailto:rfc-editor@rfc-=
editor.org" target=3D"_blank">rfc-editor@rfc-editor.org</a>&gt;<br>
=C2=A0 =C2=A0 Sent: Friday, October 12, 2018 12:37 PM<br>
=C2=A0 =C2=A0 To: Ali Sajassi (sajassi) &lt;<a href=3D"mailto:sajassi@cisco=
.com" target=3D"_blank">sajassi@cisco.com</a>&gt;; <a href=3D"mailto:raggar=
wa_1@yahoo.com" target=3D"_blank">raggarwa_1@yahoo.com</a>; <a href=3D"mail=
to:nabil.n.bitar@verizon.com" target=3D"_blank">nabil.n.bitar@verizon.com</=
a>; <a href=3D"mailto:aisaac71@bloomberg.net" target=3D"_blank">aisaac71@bl=
oomberg.net</a>; <a href=3D"mailto:uttaro@att.com" target=3D"_blank">uttaro=
@att.com</a>; <a href=3D"mailto:jdrake@juniper.net" target=3D"_blank">jdrak=
e@juniper.net</a>; <a href=3D"mailto:wim.henderickx@alcatel-lucent.com" tar=
get=3D"_blank">wim.henderickx@alcatel-lucent.com</a>; <a href=3D"mailto:db3=
546@att.com" target=3D"_blank">db3546@att.com</a>; <a href=3D"mailto:aretan=
a.ietf@gmail.com" target=3D"_blank">aretana.ietf@gmail.com</a>; <a href=3D"=
mailto:martin.vigoureux@nokia.com" target=3D"_blank">martin.vigoureux@nokia=
.com</a>; Giles Heron (giheron) &lt;<a href=3D"mailto:giheron@cisco.com" ta=
rget=3D"_blank">giheron@cisco.com</a>&gt;; <a href=3D"mailto:nabil.n.bitar@=
verizon.com" target=3D"_blank">nabil.n.bitar@verizon.com</a><br>
=C2=A0 =C2=A0 Cc: Krishnamoorthy Arumugham (karumugh) &lt;<a href=3D"mailto=
:karumugh@cisco.com" target=3D"_blank">karumugh@cisco.com</a>&gt;; <a href=
=3D"mailto:l2vpn@ietf.org" target=3D"_blank">l2vpn@ietf.org</a>; <a href=3D=
"mailto:rfc-editor@rfc-editor.org" target=3D"_blank">rfc-editor@rfc-editor.=
org</a><br>
=C2=A0 =C2=A0 Subject: [Technical Errata Reported] RFC7432 (5523)<br>
<br>
=C2=A0 =C2=A0 The following errata report has been submitted for RFC7432, &=
quot;BGP MPLS-Based Ethernet VPN&quot;.<br>
<br>
=C2=A0 =C2=A0 --------------------------------------<br>
=C2=A0 =C2=A0 You may review the report below and at:<br>
=C2=A0 =C2=A0 <a href=3D"http://www.rfc-editor.org/errata/eid5523" rel=3D"n=
oreferrer" target=3D"_blank">http://www.rfc-editor.org/errata/eid5523</a><b=
r>
<br>
=C2=A0 =C2=A0 --------------------------------------<br>
=C2=A0 =C2=A0 Type: Technical<br>
=C2=A0 =C2=A0 Reported by: Krishnamoorthy Arumugham &lt;<a href=3D"mailto:k=
arumugh@cisco.com" target=3D"_blank">karumugh@cisco.com</a>&gt;<br>
<br>
=C2=A0 =C2=A0 Section: 7<br>
<br>
=C2=A0 =C2=A0 Original Text<br>
=C2=A0 =C2=A0 -------------<br>
=C2=A0 =C2=A0 Clarifications to following sub-sections:<br>
=C2=A0 =C2=A0 Section 7.1<br>
=C2=A0 =C2=A0 Section 7.2<br>
=C2=A0 =C2=A0 Section 7.5<br>
<br>
<br>
=C2=A0 =C2=A0 Corrected Text<br>
=C2=A0 =C2=A0 --------------<br>
=C2=A0 =C2=A0 Section 7.1:<br>
=C2=A0 =C2=A0 Add below text to the section 7.1 regarding the encoding of M=
PLS label:<br>
<br>
=C2=A0 =C2=A0 &quot;The value of the 20-bit MPLS label is encoded in the hi=
gh-order 20 bits of the 3 bytes MPLS Label field.&quot;<br>
<br>
=C2=A0 =C2=A0 Section 7.2:<br>
=C2=A0 =C2=A0 Add below text to the section 7.2 regarding the encoding of b=
oth the MPLS label fields:<br>
<br>
=C2=A0 =C2=A0 &quot;The value of the 20-bit MPLS label is encoded in the hi=
gh-order 20 bits of the 3 bytes MPLS Label field for both MPLS Label1 and M=
PLS Label2.&quot;<br>
<br>
=C2=A0 =C2=A0 Section 7.5:<br>
=C2=A0 =C2=A0 Add below text to the section 7.5 regarding the encoding of E=
SI Label fields:<br>
<br>
=C2=A0 =C2=A0 &quot;The value of the 20-bit MPLS label is encoded in the hi=
gh-order 20 bits of the ESI Label field.&quot;<br>
<br>
<br>
=C2=A0 =C2=A0 Notes<br>
=C2=A0 =C2=A0 -----<br>
=C2=A0 =C2=A0 MPLS label is a 20-bit value and is stored in a 3 bytes field=
 in a packet. The 20-bit MPLS label value is generally stored in higher ord=
er 20 bits of the 3 byte label field. The exact encoding to be followed for=
 storing MPLS label values are not explicitly mentioned in the RFC 7432 und=
er section 7.1, 7.2 and 7.5 for different types of EVPN routes. This lead t=
o ambiguity in different implementations. Hence a clarification is required=
.<br>
<br>
=C2=A0 =C2=A0 Instructions:<br>
=C2=A0 =C2=A0 -------------<br>
=C2=A0 =C2=A0 This erratum is currently posted as &quot;Reported&quot;. If =
necessary, please<br>
=C2=A0 =C2=A0 use &quot;Reply All&quot; to discuss whether it should be ver=
ified or<br>
=C2=A0 =C2=A0 rejected. When a decision is reached, the verifying party=C2=
=A0 <br>
=C2=A0 =C2=A0 can log in to change the status and edit the report, if neces=
sary. <br>
<br>
=C2=A0 =C2=A0 --------------------------------------<br>
=C2=A0 =C2=A0 RFC7432 (draft-ietf-l2vpn-evpn-11)<br>
=C2=A0 =C2=A0 --------------------------------------<br>
=C2=A0 =C2=A0 Title=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0:=
 BGP MPLS-Based Ethernet VPN<br>
=C2=A0 =C2=A0 Publication Date=C2=A0 =C2=A0 : February 2015<br>
=C2=A0 =C2=A0 Author(s)=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0: A. Sajass=
i, Ed., R. Aggarwal, N. Bitar, A. Isaac, J. Uttaro, J. Drake, W. Henderickx=
<br>
=C2=A0 =C2=A0 Category=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 : PROPOSED =
STANDARD<br>
=C2=A0 =C2=A0 Source=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 : Laye=
r 2 Virtual Private Networks<br>
=C2=A0 =C2=A0 Area=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 :=
 Routing<br>
=C2=A0 =C2=A0 Stream=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 : IETF=
<br>
=C2=A0 =C2=A0 Verifying Party=C2=A0 =C2=A0 =C2=A0: IESG<br>
<br>
=C2=A0 =C2=A0 _______________________________________________<br>
=C2=A0 =C2=A0 BESS mailing list<br>
=C2=A0 =C2=A0 <a href=3D"mailto:BESS@ietf.org" target=3D"_blank">BESS@ietf.=
org</a><br>
=C2=A0 =C2=A0 <a href=3D"https://www.ietf.org/mailman/listinfo/bess" rel=3D=
"noreferrer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/bess</=
a><br>
<br>
=C2=A0 =C2=A0 _______________________________________________<br>
=C2=A0 =C2=A0 BESS mailing list<br>
=C2=A0 =C2=A0 <a href=3D"mailto:BESS@ietf.org" target=3D"_blank">BESS@ietf.=
org</a><br>
=C2=A0 =C2=A0 <a href=3D"https://www.ietf.org/mailman/listinfo/bess" rel=3D=
"noreferrer" target=3D"_blank">https://www.ietf.org/mailman/listinfo/bess</=
a><br>
<br>
<br>
_______________________________________________<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>
<br>
___________________________________________________________________________=
______________________________________________<br>
<br>
Ce message et ses pieces jointes peuvent contenir des informations confiden=
tielles ou privilegiees et ne doivent donc<br>
pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu=
 ce message par erreur, veuillez le signaler<br>
a l&#39;expediteur et le detruire ainsi que les pieces jointes. Les message=
s electroniques etant susceptibles d&#39;alteration,<br>
Orange decline toute responsabilite si ce message a ete altere, deforme ou =
falsifie. Merci.<br>
<br>
This message and its attachments may contain confidential or privileged inf=
ormation that may be protected by law;<br>
they should not be distributed, used or copied without authorisation.<br>
If you have received this email in error, please notify the sender and dele=
te this message and its attachments.<br>
As emails may be altered, Orange is not liable for messages that have been =
modified, changed or falsified.<br>
Thank you.<br>
<br>
_______________________________________________<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>

--000000000000f5858b0578d87b2a--


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From: "Ali Sajassi (sajassi)" <sajassi@cisco.com>
To: Greg Mirsky <gregimirsky@gmail.com>, Stephane Litkowski <stephane.litkowski@orange.com>
CC: "Jakob Heitz (jheitz)" <jheitz@cisco.com>, "zhuangshunwan@huawei.com" <zhuangshunwan@huawei.com>, BESS <bess@ietf.org>
Thread-Topic: [bess] Encoding a 20 bit label in a 24 bit field.
Thread-Index: AQHUZXXQUdZMwhG1nUinrA2l/1QLW6Urk7IAgACLu4D//5GhgA==
Date: Mon, 22 Oct 2018 22:32:37 +0000
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References: <F78CB1EA-86B9-4496-852A-4E262263E256@cisco.com> <26390_1540216052_5BCDD4F4_26390_189_1_9E32478DFA9976438E7A22F69B08FF924B311B3B@OPEXCLILMA4.corporate.adroot.infra.ftgroup> <CA+RyBmWjrKmOkjOnK6cUSLQyMQw-YXeTQ751Xmc1328H1Gktcw@mail.gmail.com>
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Subject: Re: [bess] Encoding a 20 bit label in a 24 bit field.
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From: "Patrice Brissette (pbrisset)" <pbrisset@cisco.com>
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>, "hshah@ciena.com" <hshah@ciena.com>, "jorge.rabadan@nokia.com" <jorge.rabadan@nokia.com>, "Ing-Wher_Chen@jabil.com" <Ing-Wher_Chen@jabil.com>, "ihussain@infinera.com" <ihussain@infinera.com>, "kishoret@juniper.net" <kishoret@juniper.net>
CC: "bess@ietf.org" <bess@ietf.org>
Thread-Topic: Questions about the EVPN YANG data model draft
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Date: Tue, 23 Oct 2018 00:19:28 +0000
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Subject: Re: [bess] Questions about the EVPN YANG data model draft
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--_000_646F9E5322084809B3506E9D043A69CFciscocom_--


From nobody Mon Oct 22 18:41:19 2018
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From: Benjamin Kaduk <kaduk@mit.edu>
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Subject: [bess] Benjamin Kaduk's Discuss on draft-ietf-bess-mvpn-expl-track-12: (with DISCUSS and COMMENT)
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Benjamin Kaduk has entered the following ballot position for
draft-ietf-bess-mvpn-expl-track-12: Discuss

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----------------------------------------------------------------------
DISCUSS:
----------------------------------------------------------------------

This document places normative requirements on new tunnel types but does
not indicate this in a way that someone specifying a new tunnel type would
be forced to see.  This occurs both in Section 5.2:

   o  When additional tunnel types are defined, the specification for
      how MVPN is to use those tunnel types must also specify how to
      construct the PTA of a Leaf A-D route that is originated in
      response to the LIR-pF flag.  As an example, see [BIER-MVPN].

and in Section 6:

   If L's PTA specifies a tunnel type not mentioned above, the
   specification for how MVPN uses that tunnel type must specify the
   actions that N is to take upon receiving L.  As an example, see
   [BIER-MVPN].

I think the best way to do this would be to have IANA Considerations
updating the registration procedure for
P-Multicast Service Interface (PMSI) Tunnel Type codepoints to note that
new registrations must include this information.  It might also suffice to
call out the existence of these requirements in the portion of the
Introduction that discusses how this document Updates RFC 6514 (though, per
the COMMENT section, this portion of the Introduction doesn't exist in a
good form yet).

Thank you for providing the BIER example, though -- it is helpful to see
how the requirement plays out in practice!


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

Section 1

   This document clarifies the procedures for originating and receiving
   S-PMSI A-D routes and Leaf A-D routes.  This document also adds new
   procedures to allow more efficient explicit tracking.  The procedures
   being clarified and/or extended are discussed in multiple places in
   the documents being updated.

This is in effect saying to the reader, "you must read the updated
document(s) in their entirety and decide for yourself whether a procedure
being updated is described", which is perhaps not the most friendly thing
to be doing.

Section 2

   If the LIR-pF flag is set in the PTA of an S-PMSI A-D route, the LIR
   flag of that PTA MUST also be set.

What do I do if I receive a PTA in violation of the MUST?

   Note that support for the LIR-pF flag is OPTIONAL.  This flag SHOULD
   NOT be set unless it is known that all the PEs that are to receive
   the route carrying the PTA support the flag.  How this is known is
   outside the scope of this document.

Maybe remind us what a PE that doesn't support this flag will do if it
happens to receive a PTA with it set?  (I see discussion below of the state
at the ingress node in this case, but not an explicit confirmation of what
egress nodes do.)  It would also be nice to give non-normative examples of
how a sender might know that receivers support the flag.

Section 3

   The rules for finding a "match for reception" in [RFC6625] are hereby
   modified as follows:

Maybe give a section reference too?  (Especially since 6625 does not use
the abbreviated version we define here, and instead writes "Finding the
Match for Data Reception".)

      For a given C-flow ((C-S,C-G) or (C-*,C-G)) the "match for
      tracking" is chosen as follows.  Ignore any S-PMSI A-D route that
      has no PTA.  Also ignore any S-PMSI A-D route whose PTA specifies
      "no tunnel information present", but does not have either LIR or
      LIR-pF set.  (That is, DO NOT ignore an S-PMSI A-D route that has

I think this would be clearer as "and has neither LIR nor LIR-pF set" --
the "but" can easily lead the reader astray.

      a PTA specifying "no tunnel information present" unless its LIR
      and LIR-pF bits are both clear).  [...]

      Note that the procedure for finding the match for tracking takes
      into account S-PMSI A-D routes whose PTAs specify "no tunnel
      information present" and that have either LIR or LIR-pf set.  The
      procedure for finding the match for reception ignores such routes.

Why are we talking about this like LIR and LIR-pF can be set independently,
when just last page we said that if LIR-pF is set, LIR MUST be set?

Section 4

Please expand I-PMSI on first usage.

       When following this procedure, the PTA of the S-PMSI A-D route
       may specify a tunnel, or may specify "no tunnel information
       present".  The choice between these two options is determined by
       considerations that are outside the scope of this document.

Could you give some examples of what sort of things might be involved in
making that choice?

Section 5.3

   Suppose the forwarded S-PMSI A-D route has a PTA specifying a tunnel,
   and also has LIR-pF set.  [...]

nit: is this this "route being forwarded" (i.e., where the ABR/ASBR acts as
egress) or the "after forwarding route" (i.e., where the ABR/ASBR acts as
ingress)?

   As a result of propagating such an S-PMSI A-D route, the egress ABR/
   ASBR may receive one or more Leaf A-D routes that correspond to that
   S-PMSI A-D route.  [...]

Just to check my understanding (no document change requested), this
correspondance is determined by the NLRI in the Leaf A-D route matching the
NLRI from the S-PMSI A-D route?

   The "global administrator" field of the modified RT will be set to
   the IP address taken either from the S-PMSI A-D route's next hop
   field ([RFC6514]), or from its Segmented P2MP Next Hop Extended
   Community ([RFC7524]).

How do I choose which one to use?

Section 6

   then the action taken by N when it receives L is a local matter.  In
   this case, the Leaf A-D route L provides N with explicit tracking
   information for the flow identified by L's NLRI.  However, that
   information is for management/monitoring purposes and does not have
   an effect on the flow of multicast traffic.

I would prefer to say "does not necessarily have an effect".

Section 9

I agree with the secdir reviewer that some mitigation for the new problem
indicated is appropriate.  (Some justification for why the problem is
insoluble in the scope of this document might also suffice.)

Additionally, it seems that the mechanisms here can require more state to
be maintained in the SP network than a pure 6513/6514 solution would, and
that could be worth mentioning (along the lines of 6513's mention of the
potential for overload when multicast activity exceeds expectations).
Similarly, additional implementation limitations may be advisable.



From nobody Mon Oct 22 22:35:48 2018
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "hshah@ciena.com" <hshah@ciena.com>, "jorge.rabadan@nokia.com" <jorge.rabadan@nokia.com>, "ing-wher_chen@jabil.com" <ing-wher_chen@jabil.com>, "ihussain@infinera.com" <ihussain@infinera.com>, "kishoret@juniper.net" <kishoret@juniper.net>, "Patrice Brissette (pbrisset)" <pbrisset@cisco.com>
CC: "bess@ietf.org" <bess@ietf.org>
Thread-Topic: Questions about the EVPN YANG data model draft
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/Q7soT8bfwOyeDBKzXlgN53WkfhQ>
Subject: Re: [bess] Questions about the EVPN YANG data model draft
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Patrice,
Lots of thanks for a prompt response.

I have just looked up the diff between -05 and -06 versions of the draft.

It seems that the only change is refresh of references as some of the draf=
ts to which the -05 version referred have been publishesd as RFCs.

So I think that my questions equally apply to the -06 version.

Regards,
Sasha

Thumb typed by Sasha Vainshtein

________________________________
From: Patrice Brissette (pbrisset) <pbrisset@cisco.com>
Sent: Tuesday, October 23, 2018 3:19:28 AM
To: Alexander Vainshtein; hshah@ciena.com; jorge.rabadan@nokia.com; Ing-Wh=
er_Chen@jabil.com; ihussain@infinera.com; kishoret@juniper.net
Cc: bess@ietf.org
Subject: Re: Questions about the EVPN YANG data model draft

Hi Alex,

I just refresh the draft. Unfortunately, I just notice your email. I will =
make sure it is properly handle.

Regards,

Patrice Brissette, Principal Engineer
Cisco Systems
Help us track your SP SR/EVPN Customer Opportunity/Status by filling these=
 forms: Segment Routing<https://app.smartsheet.com/b/form/185833ace35b4894=
b324dfb8afbd2060> / EVPN<https://app.smartsheet.com/b/form/136bd5c3a22641b=
f92316523e79d6f22>



From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
Date: Sunday, October 21, 2018 at 7:00 AM
To: Patrice Brissette <pbrisset@cisco.com>, "hshah@ciena.com" <hshah@ciena=
.com>, "jorge.rabadan@nokia.com" <jorge.rabadan@nokia.com>, "Ing-Wher_Chen=
@jabil.com" <Ing-Wher_Chen@jabil.com>, "ihussain@infinera.com" <ihussain@i=
nfinera.com>, "kishoret@juniper.net" <kishoret@juniper.net>
Cc: "bess@ietf.org" <bess@ietf.org>
Subject: Questions about the EVPN YANG data model draft

Dear Editors of the EVPN YANG data model draft<https://tools.ietf.org/html=
/draft-ietf-bess-evpn-yang-05>,
I have several questions regarding the draft, and would highly appreciated=
 your responses.


1.       The -05 version of the draft has expired almost two months ago. D=
o you plan to refresh it any time soon?

2.       The draft consistently uses type uint32 for the Ethernet segment =
identifier (ESI), while RFC 7432 explicitly defines it as a 10-octet integ=
er. Is this just a typo, or did I miss something substantial here?

3.       The draft states that it covers Integrated Routing and Bridging i=
n EVPN, but I could not find any traces of such coverage. Did I miss somet=
hing, or is just a forward declaration for the future version of the draft=
?

4.       RFC 7432 states that =93When a customer site is connected to one =
or more PEs via a set of Ethernet links, then this set of Ethernet links c=
onstitutes an Ethernet segment". The Virtual Ethernet Segment draft<https:=
//tools.ietf.org/html/draft-ietf-bess-evpn-virtual-eth-segment-00> expands=
 this definition and, so that virtual Ethernet Segments can be comprised o=
f:

=B7         Ethernet Virtual Circuits aggregated on an ENNI physical ports=


=B7         Ethernet PWs or even MPLS LSPs.
Can you please clarify the following:

a.       How does the proposed YANG data model differentiate between physi=
cal and virtual Ethernet Segments?

b.       Does this data model cover the scenario where the virtual Etherne=
t segments are represented by EVCs?

5.       RFC 7432 includes recommendations for usage (or non-usage) of the=
 Control Word in the EVPN encapsulation, and RFC 8214 (which is claimed to=
 be covered by this draft) provides a control plane mechanism for exchangi=
ng the CW usage information. Can you please clarify whether the draft cove=
r usage of the CW in the EVPN encapsulations?
Your feedback will be highly appreciated.

Regards, and lots of thanks in advance,
Sasha

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


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:sans-serif; font-size:11pt; color:black">
Patrice,<br>
</div>
<div dir=3D"auto" style=3D"direction:ltr; margin:0; padding:0; font-family=
:sans-serif; font-size:11pt; color:black">
Lots of thanks for a prompt response.<br>
<br>
</div>
<div dir=3D"auto" style=3D"direction:ltr; margin:0; padding:0; font-family=
:sans-serif; font-size:11pt; color:black">
I have just looked up the diff between -05 and -06 versions of the draft.<=
br>
<br>
</div>
<div dir=3D"auto" style=3D"direction:ltr; margin:0; padding:0; font-family=
:sans-serif; font-size:11pt; color:black">
It seems that the only change is refresh of references as some of the draf=
ts to which the -05 version referred have been publishesd as RFCs.<br>
<br>
</div>
<div dir=3D"auto" style=3D"direction:ltr; margin:0; padding:0; font-family=
:sans-serif; font-size:11pt; color:black">
So I think that my questions equally apply to the -06 version.<br>
<br>
</div>
<div dir=3D"auto" style=3D"direction:ltr; margin:0; padding:0; font-family=
:sans-serif; font-size:11pt; color:black">
Regards,<br>
</div>
<div dir=3D"auto" style=3D"direction:ltr; margin:0; padding:0; font-family=
:sans-serif; font-size:11pt; color:black">
Sasha<br>
<br>
</div>
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:sans-serif; font-size:11pt; color:black">
<div dir=3D"auto" style=3D"direction:ltr; margin:0; padding:0; font-family=
:sans-serif; font-size:11pt; color:black">
Thumb typed by Sasha Vainshtein</div>
<br>
</div>
<hr tabindex=3D"-1" style=3D"display:inline-block; width:98%">
<div id=3D"divRplyFwdMsg" dir=3D"ltr"><font face=3D"Calibri, sans-serif" c=
olor=3D"#000000" style=3D"font-size:11pt"><b>From:</b> Patrice Brissette (=
pbrisset) &lt;pbrisset@cisco.com&gt;<br>
<b>Sent:</b> Tuesday, October 23, 2018 3:19:28 AM<br>
<b>To:</b> Alexander Vainshtein; hshah@ciena.com; jorge.rabadan@nokia.com;=
 Ing-Wher_Chen@jabil.com; ihussain@infinera.com; kishoret@juniper.net<br>
<b>Cc:</b> bess@ietf.org<br>
<b>Subject:</b> Re: Questions about the EVPN YANG data model draft</font>
<div>&nbsp;</div>
</div>
<div>
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi Alex,</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I just refresh the draft. Unfo=
rtunately, I just notice your email. I will make sure it is properly handl=
e.</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;</span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:black">Regards,=
</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:black">&nbsp;</=
span></p>
<p class=3D"MsoNormal" style=3D"layout-grid-mode:char"><span lang=3D"EN-US=
" style=3D"color:black">Patrice Brissette, Principal Engineer</span></p>
<p=20class=3D"MsoNormal" style=3D"layout-grid-mode:char"><span lang=3D"EN-=
US" style=3D"color:black">Cisco Systems</span></p>
<p class=3D"MsoNormal" style=3D"layout-grid-mode:char"><b><span lang=3D"EN=
-GB" style=3D"font-size:8.0pt; font-family:&quot;Verdana&quot;,sans-serif;=
 color:#0070C0">Help us track your SP SR/EVPN Customer Opportunity/Status =
by filling these forms:&nbsp;<a href=3D"https://app.smartsheet.com/b/form/=
185833ace35b4894b324dfb8afbd2060"><span style=3D"color:#0070C0">Segment
 Routing</span></a>&nbsp;/&nbsp;<a href=3D"https://app.smartsheet.com/b/fo=
rm/136bd5c3a22641bf92316523e79d6f22"><span style=3D"color:#0070C0">EVPN</s=
pan></a></span></b></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:black">&nbsp;</=
span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;</span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">&nbsp;</span></p>
<div style=3D"border:none; border-top:solid #B5C4DF 1.0pt; padding:3.0pt 0=
cm 0cm 0cm">
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><b><span style=3D"font=
-size:12.0pt; color:black">From:
</span></b><span style=3D"font-size:12.0pt; color:black">Alexander Vainsht=
ein &lt;Alexander.Vainshtein@ecitele.com&gt;<br>
<b>Date: </b>Sunday, October 21, 2018 at 7:00 AM<br>
<b>To: </b>Patrice Brissette &lt;pbrisset@cisco.com&gt;, &quot;hshah@ciena=
.com&quot; &lt;hshah@ciena.com&gt;, &quot;jorge.rabadan@nokia.com&quot; &l=
t;jorge.rabadan@nokia.com&gt;, &quot;Ing-Wher_Chen@jabil.com&quot; &lt;Ing=
-Wher_Chen@jabil.com&gt;, &quot;ihussain@infinera.com&quot; &lt;ihussain@i=
nfinera.com&gt;, &quot;kishoret@juniper.net&quot;
 &lt;kishoret@juniper.net&gt;<br>
<b>Cc: </b>&quot;bess@ietf.org&quot; &lt;bess@ietf.org&gt;<br>
<b>Subject: </b>Questions about the EVPN YANG data model draft</span></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;</p>
</div>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Dear Editors of the <a=
 href=3D"https://tools.ietf.org/html/draft-ietf-bess-evpn-yang-05">
EVPN YANG data model draft</a>,</p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">I have several questio=
ns regarding the draft, and would highly appreciated your responses.</p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;</p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt; text-indent:-18=
.0pt"><span style=3D"">1.<span style=3D"font:7.0pt &quot;Times New Roman&q=
uot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span>The -05 version of the draft has expired almost two months a=
go. Do you plan to refresh it any time soon?</p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt; text-indent:-18=
.0pt"><span style=3D"">2.<span style=3D"font:7.0pt &quot;Times New Roman&q=
uot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span>The draft consistently uses type uint32 for the Ethernet seg=
ment identifier (ESI), while RFC 7432 explicitly defines it as a 10-octet =
integer. Is this just a typo, or did I miss something substantial here?</p=
>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt; text-indent:-18=
.0pt"><span style=3D"">3.<span style=3D"font:7.0pt &quot;Times New Roman&q=
uot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span>The draft states that it covers Integrated Routing and Bridg=
ing in EVPN, but I could not find any traces of such coverage. Did I miss =
something, or is just a forward declaration for the future version of the =
draft?</p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt; text-indent:-18=
.0pt"><span style=3D"">4.<span style=3D"font:7.0pt &quot;Times New Roman&q=
uot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span>RFC 7432 states that =93When a customer site is connected to=
 one or more PEs via a set of Ethernet links, then this set of Ethernet li=
nks constitutes an Ethernet segment&quot;. The
<a href=3D"https://tools.ietf.org/html/draft-ietf-bess-evpn-virtual-eth-se=
gment-00">
Virtual Ethernet Segment draft</a> expands this definition and, so that vi=
rtual Ethernet Segments can be comprised of:</p>
<p class=3D"MsoListParagraph" style=3D"margin-left:108.0pt; text-indent:-1=
8.0pt"><span style=3D"font-family:Symbol"><span style=3D"">=B7<span style=3D=
"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;
</span></span></span>Ethernet Virtual Circuits aggregated on an ENNI physi=
cal ports</p>
<p class=3D"MsoListParagraph" style=3D"margin-left:108.0pt; text-indent:-1=
8.0pt"><span style=3D"font-family:Symbol"><span style=3D"">=B7<span style=3D=
"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;
</span></span></span>Ethernet PWs or even MPLS LSPs.</p>
<p class=3D"MsoNormal" style=3D"margin-left:72.0pt">Can you please clarify=
 the following:</p>
<p class=3D"MsoListParagraph" style=3D"margin-left:108.0pt; text-indent:-1=
8.0pt"><span style=3D"">a.<span style=3D"font:7.0pt &quot;Times New Roman&=
quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span>How does the proposed YANG data model differentiate between =
physical and virtual Ethernet Segments?
</p>
<p class=3D"MsoListParagraph" style=3D"margin-left:108.0pt; text-indent:-1=
8.0pt"><span style=3D"">b.<span style=3D"font:7.0pt &quot;Times New Roman&=
quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span>Does this data model cover the scenario where the virtual Et=
hernet segments are represented by EVCs?</p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt; text-indent:-18=
.0pt"><span style=3D"">5.<span style=3D"font:7.0pt &quot;Times New Roman&q=
uot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span>RFC 7432 includes recommendations for usage (or non-usage) o=
f the Control Word in the EVPN encapsulation, and RFC 8214 (which is claim=
ed to be covered by this draft) provides a control plane mechanism for exc=
hanging the CW usage information. Can
 you please clarify whether the draft cover usage of the CW in the EVPN en=
capsulations?</p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Your feedback will be =
highly appreciated.</p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;</p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Regards, and lots of t=
hanks in advance,</p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Sasha</p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;</p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Office: &#43;972-39266=
302</p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Cell:&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; &#43;972-549266302</p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">Email:&nbsp;&nbsp; Ale=
xander.Vainshtein@ecitele.com</p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt">&nbsp;</p>
<p class=3D"MsoNormal" style=3D"margin-left:36.0pt"><br>
__________________________________________________________________________=
_<br>
<br>
This e-mail message is intended for the recipient only and contains inform=
ation which is
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CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece=
ived this
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transmission in error, please inform us by e-mail, phone or fax, and then =
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<br clear=3D"both">
__________________________________________________________________________=
_<BR>
<BR>
This e-mail message is intended for the recipient only and contains inform=
ation which=20is <BR>
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From: James Bensley <jwbensley@gmail.com>
Date: Tue, 23 Oct 2018 09:06:08 +0100
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To: bess@ietf.org
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/RIoENUgwJc5EQ_Rp2_FiZ3JJcEI>
Subject: [bess] CW in EVPN: Was Signaling Control Word in EVPN
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Hi All,

I've removed all the individual contacts as per mod request and
changed the subject as this conversation was diverging away from the
OPs original query (sorry if any of that was my fault).


On Tue, 9 Oct 2018 at 15:54, Andrew G. Malis <agmalis@gmail.com> wrote:
>
> James,
>
> Agreed. We touched on that in section 7 of draft-ietf-pals-ethernet-cw, w=
here we advised operators that enabling post-CW DPI for ECMP calculations c=
ould cause misordering.

Hi Andy,

Perhaps I wasn't clear enough - and LSR (not the ingress/egress LER)
even trying to detect CW is a source of problems within the network,
this is why I was querying the use of the PWMCW.


On Tue, 9 Oct 2018 at 16:44, Yutianpeng (Tim) <yutianpeng@huawei.com> wrote=
:
>
> Personally I support having control word capability which is more common.=
 It is said in RFC 8214:
>
>    =E2=80=9CIt is recommended that the control word be included in the ab=
sence of an entropy label=E2=80=9D
>
> So I think we can still have EL capability on EVPN VPWS if I understand c=
orrect. Only if the existing "BGP Path  Attributes" does not work well.
>
> I support adapt CW capability into EVPN also as EVPN itself is facing sam=
e challenge with EVPN VPWS.
>
> By the way, rfc4385 mentioned PW controlling ECMP.

The CW doesn't control ECMP - this is my gripe here. It's one thing to
recommend a technology that not all devices support (EL/ELI or FAT)
but which fully fixes the problem if it supported, it's another thing
to recommend a technology that doesn't fully fix the problem if it is
supported at all. My concern is that by continuing to suggest a
partial solution (PWMCW) we help to keep that partial solution in
circulation when surely the WG should look to deprecate it for a
solution that fully fixes the problem?

Cheers,
James.


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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: James Bensley <jwbensley@gmail.com>
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Thread-Topic: [bess] CW in EVPN: Was Signaling Control Word in EVPN
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Subject: Re: [bess] CW in EVPN: Was Signaling Control Word in EVPN
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Subject: [bess] A question regarding draft-wang-bess-evepn-control-word
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Dear authors of draft-wang-bess-evpn-control-word<https://tools.ietf.org/h=
tml/draft-wang-bess-evpn-control-word-00>,
I have doubts regarding at least one of the approaches for negotiating the=
 CW usage in the EVPN encapsulation between egress and ingress PE that is =
defined in the draft.

In the case when the egress PE can receive EVPN-encapsulated packets both =
with and without CW, the draft seems to propose (as one of the possibiliti=
es) advertisement of two EVPN routes for each ES or MAC/IP pair:

-          One of these routes would use the CW Capability to indicate tha=
t it refers to the EVPN encapsulation that uses the CW, and would carry th=
e appropriate label in its NLRI

-          The other route would not use the CW Capability to indicate tha=
t it refers to the EVPN encapsulation that does not use the CW, and carry =
a different label in its NLRI

The ingress PE that accepts these routes would then use one of them based =
on its own ability to use the CW (or lack thereof), and use the correspond=
ing label it=20its EVPN encapsulation, while  the DP in the egress PW woul=
d infer presence or absence of the CW from the received EVPN application l=
abel.

Unfortunately, I do not think that this can work because, as per RFC 7432<=
https://tools.ietf.org/html/rfc7432>, labels in the labeled NLRI of EVPN r=
outes are not part of the route key for the purpose of the BGP route key p=
rocessing, while the label is treated just as the BGP attribute. This mean=
s that, unless some form of BGP multi-path is enabled in the ingress PE (a=
nd in all RRs on the way between the egress PE and ingress PE) for the L2V=
PN/EVPN  AFI/SAFI, only one of these routes will be selected by the BGP se=
lection process.

Did I miss something substantial here?

Regards, and lots of thanks in advance,
Sasha

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


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<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal">Dear authors of <a href=3D"https://tools.ietf.org/h=
tml/draft-wang-bess-evpn-control-word-00">
draft-wang-bess-evpn-control-word</a>,<o:p></o:p></p>
<p class=3D"MsoNormal">I have doubts regarding at least one of the approac=
hes for negotiating the CW usage in the EVPN encapsulation between egress =
and ingress PE that is defined in the draft.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">In the case when the egress PE can receive EVPN-enc=
apsulated packets both with and without CW, the draft seems to propose (as=
 one of the possibilities) advertisement of two EVPN routes for each ES or=
 MAC/IP pair:<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 lev=
el1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span styl=
e=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]><span dir=3D"LTR"></span>One of these routes would=
 use the CW Capability to indicate that it refers to the EVPN encapsulatio=
n that uses the CW, and would carry the appropriate label in its NLRI<o:p>=
</o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 lev=
el1 lfo1"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span styl=
e=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]><span dir=3D"LTR"></span>The other route would not=
 use the CW Capability to indicate that it refers to the EVPN encapsulatio=
n that does not use the CW, and carry a different label in its NLRI<o:p></=
o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The ingress PE that accepts these routes would then=
 use one of them based on its own ability to use the CW (or lack thereof),=
 and use the corresponding label it its EVPN encapsulation, while &nbsp;th=
e DP in the egress PW would infer presence
 or absence of the CW from the received EVPN application label.<o:p></o:p>=
</p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Unfortunately, I do not think that this can work be=
cause, as per
<a href=3D"https://tools.ietf.org/html/rfc7432">RFC 7432</a>, labels in th=
e labeled NLRI of EVPN routes are not part of the route key for the purpos=
e of the BGP route key processing, while the label is treated just as the =
BGP attribute. This means that, unless
 some form of BGP multi-path is enabled in the ingress PE (and in all RRs =
on the way between the egress PE and ingress PE) for the L2VPN/EVPN &nbsp;=
AFI/SAFI, only one of these routes will be selected by the BGP selection p=
rocess.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Did I miss something substantial here?<o:p></o:p></=
p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p><=
/p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Office: &#43;972-39266302<o:p></o:p></p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266=
302<o:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; Alexander.Vainshtein@ecitele.com=
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<br clear=3D"both">
__________________________________________________________________________=
_<BR>
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From: "Wanghaibo (Rainsword)" <rainsword.wang@huawei.com>
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>, "draft-wang-bess-evpn-control-word.authors@ietf.org" <draft-wang-bess-evpn-control-word.authors@ietf.org>
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<body lang=3D"ZH-CN" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Hi Alex=
ander,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The num=
ber of routes advertised by the Sender router in our solution will not chan=
ge, but only carries a next hop capability attribute with control word
 capability<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The Rec=
eiver router determines whether to carry the control word when forwarding p=
ackets according to its own capabilities.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The fol=
lowing figure is an example.:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">PE1----=
------PE2<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:10.5pt"><span lang=3D"EN-US" st=
yle=3D"font-size:10.5pt;font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sa=
ns-serif;color:black">|-----------PE3<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">When PE=
1 advertises a route, it carries the next hop attribute of the control word=
 capability. The routes received by PE2 and PE3 are the same.<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">If &nbs=
p;PE2 do not support the control word, it will not carry the control word w=
hen forwarding packets to PE1.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">PE1 can=
not find the control word indication label when parsing the PE2 packet. PE1=
 will treat the packet as normal.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">If &nbs=
p;PE3 support the control word, it can add a control word when forwarding t=
he packet to the PE1, and add the control word indication label specified
 by the PE1. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">When th=
e PE1 receives the packet and finds the control word indication label in th=
e packet. PE1 will correctly process the control word.<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Thanks<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Haibo<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=
=C5=BA=DA&quot;,sans-serif">=B7=A2=BC=FE=C8=CB<span lang=3D"EN-US">:</span>=
</span></b><span lang=3D"EN-US" style=3D"font-family:&quot;=CE=A2=C8=ED=D1=
=C5=BA=DA&quot;,sans-serif"> Alexander Vainshtein [mailto:Alexander.Vainsht=
ein@ecitele.com]
<br>
</span><b><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,s=
ans-serif">=B7=A2=CB=CD=CA=B1=BC=E4<span lang=3D"EN-US">:</span></span></b>=
<span lang=3D"EN-US" style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&qu=
ot;,sans-serif"> 2018</span><span style=3D"font-family:&quot;=CE=A2=C8=ED=
=D1=C5=BA=DA&quot;,sans-serif">=C4=EA<span lang=3D"EN-US">10</span>=D4=C2<s=
pan lang=3D"EN-US">23</span>=C8=D5<span lang=3D"EN-US">
 16:46<br>
</span><b>=CA=D5=BC=FE=C8=CB<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> draft-wang-bess-evpn-control-word.authors@ietf.org<br>
</span><b>=B3=AD=CB=CD<span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"=
> bess@ietf.org<br>
</span><b>=D6=F7=CC=E2<span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"=
> A question regarding draft-wang-bess-evepn-control-word<o:p></o:p></span>=
</span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Dear authors of <a href=3D"http=
s://tools.ietf.org/html/draft-wang-bess-evpn-control-word-00">
draft-wang-bess-evpn-control-word</a>,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I have doubts regarding at leas=
t one of the approaches for negotiating the CW usage in the EVPN encapsulat=
ion between egress and ingress PE that is defined in the draft.<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">In the case when the egress PE =
can receive EVPN-encapsulated packets both with and without CW, the draft s=
eems to propose (as one of the possibilities) advertisement of two EVPN rou=
tes for each ES or MAC/IP pair:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo2"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">One of these routes wou=
ld use the CW Capability to indicate that it refers to the EVPN encapsulati=
on that uses the CW, and would carry the appropriate label in its NLRI<o:p>=
</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo2"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">The other route would n=
ot use the CW Capability to indicate that it refers to the EVPN encapsulati=
on that does not use the CW, and carry a different label in its NLRI<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The ingress PE that accepts the=
se routes would then use one of them based on its own ability to use the CW=
 (or lack thereof), and use the corresponding label it its EVPN encapsulati=
on, while &nbsp;the DP in the egress PW would
 infer presence or absence of the CW from the received EVPN application lab=
el.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Unfortunately, I do not think t=
hat this can work because, as per
<a href=3D"https://tools.ietf.org/html/rfc7432">RFC 7432</a>, labels in the=
 labeled NLRI of EVPN routes are not part of the route key for the purpose =
of the BGP route key processing, while the label is treated just as the BGP=
 attribute. This means that, unless
 some form of BGP multi-path is enabled in the ingress PE (and in all RRs o=
n the way between the egress PE and ingress PE) for the L2VPN/EVPN &nbsp;AF=
I/SAFI, only one of these routes will be selected by the BGP selection proc=
ess.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Did I miss something substantia=
l here?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Regards, and lots of thanks in =
advance,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Office: &#43;972-39266302<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp; &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Email:&nbsp;&nbsp; <a href=3D"m=
ailto:Alexander.Vainshtein@ecitele.com">
Alexander.Vainshtein@ecitele.com</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;Times New Roman&quot;,serif"><br>
___________________________________________________________________________=
<br>
<br>
This e-mail message is intended for the recipient only and contains informa=
tion which is
<br>
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have recei=
ved this
<br>
transmission in error, please inform us by e-mail, phone or fax, and then d=
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--_000_1E61161D6E31D849BEA887261DB609348C770DEEnkgeml514mbxchi_--


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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "Wanghaibo (Rainsword)" <rainsword.wang@huawei.com>
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Subject: Re: [bess] A question regarding draft-wang-bess-evepn-control-word
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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Dear Haibo,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Lots of thanks for an extra-prompt response to my question.<o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">There may be some misunderstanding here.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">The draft says (the important text is highlighted):<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US">&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;There are
<span style=3D"background:yellow;mso-highlight:yellow">two methods</span> =
to specified the control word indicator label:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The first method is to ap=
ply for a reserved label to indicate<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US">&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;whether the packet contai=
ns a control word;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The second method is to
<span style=3D"background:yellow;mso-highlight:yellow">apply for a new lab=
el</span> when the sending<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; router advertises the con=
trol word capability,
<span style=3D"background:yellow;mso-highlight:yellow">which is used to<o:=
p></o:p></span></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;background=
:yellow;mso-highlight:yellow;mso-fareast-language:EN-US">&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; indicate whether the control word is included in the packet<=
/span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Courie=
r New&quot;;mso-fareast-language:EN-US">.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN" style=3D"color:#1F497D;mso-fareas=
t-language:EN-US"></span><span style=3D"color:#1F497D;mso-fareast-language=
:EN-US">My question referred just to the 2<sup>nd</sup> method, while your=
 response seems to deal with the 1<sup>st</sup>
 one.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Did I miss something?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Email:&nbsp;&nbsp; Alexander.Vainshtein@ecitele.com<o:p></o:p></span=
></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> BESS [mailto:bess-bounces@ietf.org] <b=
>On Behalf Of
</b>Wanghaibo (Rainsword)<br>
<b>Sent:</b> Tuesday, October 23, 2018 12:03 PM<br>
<b>To:</b> Alexander Vainshtein &lt;Alexander.Vainshtein@ecitele.com&gt;; =
draft-wang-bess-evpn-control-word.authors@ietf.org<br>
<b>Cc:</b> bess@ietf.org<br>
<b>Subject:</b> [bess] <span lang=3D"ZH-CN" style=3D"font-family:SimSun">=B4=
=F0=B8=B4</span>: A question regarding draft-wang-bess-evepn-control-word<=
o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Hi Alexander,<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The number of routes advertis=
ed by the Sender router in our solution will not change, but only carries =
a next hop capability attribute with control word
 capability<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The Receiver router determine=
s whether to carry the control word when forwarding packets according to i=
ts own capabilities.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The following figure is an ex=
ample.:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">PE1----------PE2<o:p></o:p></=
span></p>
<p class=3D"MsoNormal" style=3D"text-indent:10.5pt"><span style=3D"font-si=
ze:10.5pt;font-family:&quot;Microsoft YaHei&quot;,sans-serif;color:black">=
|-----------PE3<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">When PE1 advertises a route, =
it carries the next hop attribute of the control word capability. The rout=
es received by PE2 and PE3 are the same.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">If &nbsp;PE2 do not support t=
he control word, it will not carry the control word when forwarding packet=
s to PE1.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">PE1 cannot find the control w=
ord indication label when parsing the PE2 packet. PE1 will treat the packe=
t as normal.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">If &nbsp;PE3 support the cont=
rol word, it can add a control word when forwarding the packet to the PE1,=
 and add the control word indication label specified by
 the PE1. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">When the PE1 receives the pac=
ket and finds the control word indication label in the packet. PE1 will co=
rrectly process the control word.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Thanks<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Haibo<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"ZH-CN" style=3D"font-family:&quot;=
Microsoft YaHei&quot;,sans-serif">=B7=A2=BC=FE=C8=CB</span></b><b><span st=
yle=3D"font-family:&quot;Microsoft YaHei&quot;,sans-serif">:</span></b><sp=
an style=3D"font-family:&quot;Microsoft YaHei&quot;,sans-serif"> Alexander=
 Vainshtein [<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">mailto:Al=
exander.Vainshtein@ecitele.com</a>]
<br>
<b><span lang=3D"ZH-CN">=B7=A2=CB=CD=CA=B1=BC=E4</span>:</b> 2018<span lan=
g=3D"ZH-CN">=C4=EA</span>10<span lang=3D"ZH-CN">=D4=C2</span>23<span lang=3D=
"ZH-CN">=C8=D5</span> 16:46<br>
<b><span lang=3D"ZH-CN">=CA=D5=BC=FE=C8=CB</span>:</b> <a href=3D"mailto:d=
raft-wang-bess-evpn-control-word.authors@ietf.org">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b><span lang=3D"ZH-CN">=B3=AD=CB=CD</span>:</b> <a href=3D"mailto:bess@ie=
tf.org">bess@ietf.org</a><br>
<b><span lang=3D"ZH-CN">=D6=F7=CC=E2</span>:</b> A question regarding draf=
t-wang-bess-evepn-control-word<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Dear authors of <a href=3D"https://tools.ietf.org/h=
tml/draft-wang-bess-evpn-control-word-00">
draft-wang-bess-evpn-control-word</a>,<o:p></o:p></p>
<p class=3D"MsoNormal">I have doubts regarding at least one of=20the appro=
aches for negotiating the CW usage in the EVPN encapsulation between egres=
s and ingress PE that is defined in the draft.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">In the case when the egress PE can receive EVPN-enc=
apsulated packets both with and without CW, the draft seems to propose (as=
 one of the possibilities) advertisement of two EVPN routes for each ES or=
 MAC/IP pair:<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 lev=
el1 lfo2"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span styl=
e=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]><span dir=3D"LTR"></span>One of these routes would=
 use the CW Capability to indicate that it refers to the EVPN encapsulatio=
n that uses the CW, and would carry the appropriate label in its NLRI<o:p>=
</o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 lev=
el1 lfo2"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span styl=
e=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]><span dir=3D"LTR"></span>The other route would not=
 use the CW Capability to indicate that it refers to the EVPN encapsulatio=
n that does not use the CW, and carry a different label in its NLRI<o:p></=
o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The ingress PE that accepts these routes would then=
 use one of them based on its own ability to use the CW (or lack thereof),=
 and use the corresponding label it its EVPN encapsulation, while &nbsp;th=
e DP in the egress PW would infer presence
 or absence of the CW from the received EVPN application label.<o:p></o:p>=
</p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Unfortunately, I do not think that this can work be=
cause, as per
<a href=3D"https://tools.ietf.org/html/rfc7432">RFC 7432</a>, labels in th=
e labeled NLRI of EVPN routes are not part of the route key for the purpos=
e of the=20BGP route key processing, while the label is treated just as th=
e BGP attribute. This means that, unless
 some form of BGP multi-path is enabled in the ingress PE (and in all RRs =
on the way between the egress PE and ingress PE) for the L2VPN/EVPN &nbsp;=
AFI/SAFI, only one of these routes will be selected by the BGP selection p=
rocess.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Did I miss something substantial here?<o:p></o:p></=
p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p><=
/p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Office: &#43;972-39266302<o:p></o:p></p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266=
302<o:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; <a href=3D"mailto:Alexander.Vain=
shtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;T=
imes New Roman&quot;,serif"><br>
__________________________________________________________________________=
_<br>
<br>
This e-mail message is intended for the recipient only and contains inform=
ation which is
<br>
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece=
ived this
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transmission in error, please inform us by e-mail, phone or fax, and then =
delete the original
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and all copies thereof.<br>
__________________________________________________________________________=
_<o:p></o:p></span></p>
</div>
<br clear=3D"both">
__________________________________________________________________________=
_<BR>
<BR>
This e-mail message is intended for the recipient only and contains inform=
ation which is <BR>
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece=
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From: "Wanghaibo (Rainsword)" <rainsword.wang@huawei.com>
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
CC: "bess@ietf.org" <bess@ietf.org>, "draft-wang-bess-evpn-control-word.authors@ietf.org" <draft-wang-bess-evpn-control-word.authors@ietf.org>
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<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Hi Alex=
ander,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The sol=
ution here is to carry the next hop capability attribute when the route is =
advertised. The capability carried here is the control word capability.<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The spe=
cific format of the next hop capability can be referred to the draft.:
<b>&lt;draft-ietf-idr-next-hop-capability&gt;<o:p></o:p></b></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | Capability Code (2 octets)&nbsp;&nbsp; |<o=
:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | Capability Length (2 octets) |<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | Capability Value (variable)&nbsp; |<o:p></=
o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ~&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ~<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">For the=
 control word capability , it may encode as :<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | CW Capabality Type (TBD)&nbsp; &nbsp;&nbsp=
;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | CW Length (0 or 3) &nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | CWI Label (may not exist) &nbsp;&nbsp;&nbs=
p;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">CWI (Co=
ntrol word indication)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">And the=
 forwarding Packet example.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:10.5pt;font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sa=
ns-serif;color:black"></span><span lang=3D"EN-US" style=3D"font-size:12.0pt=
;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&#43;------------------------------&#43;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | Tunnel Label &nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></=
o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | EVI Label&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | CW Indicate Label &nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | Control word&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></=
o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The dif=
ference between the two methods is that which value should be use for the c=
ontrol word capability indicates label.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Method =
1, use reserved label, which should be assigned by IANA, (such as the entro=
py label, which is the value of 7)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">If we u=
se this method, then the control word capability attribute=A1=AFs CW length=
 use 0 is enough.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">And the=
 forwarding packet use the IANA specified value as the CWI (Control word in=
dication) Label .(Perhaps 8 or others)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Method2=
, use normal value, which is assigned by router.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">If we u=
se this method, then the router must assign a label used for the CWI. Perha=
ps label. And the control word capability attribute=A1=AFs CW length must
 be 3 and must contain the value in the update message.<o:p></o:p></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The for=
warding packet must use that value as the CWI label.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Regards=
,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Haibo<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Alexander Vainshtein [mailto:Alexander.Vainshtein@ecitele.com]
<br>
<b>Sent:</b> Tuesday, October 23, 2018 6:09 PM<br>
<b>To:</b> Wanghaibo (Rainsword) &lt;rainsword.wang@huawei.com&gt;<br>
<b>Cc:</b> bess@ietf.org; draft-wang-bess-evpn-control-word.authors@ietf.or=
g<br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-word=
<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Dear Haibo,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Lots of thanks for an extra-prompt response to my quest=
ion.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">There may be some misunderstanding here.<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">The draft says (the important text is highlighted):<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;There are
<span style=3D"background:yellow;mso-highlight:yellow">two methods</span> t=
o specified the control word indicator label:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The first method is to apply=
 for a reserved label to indicate<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;whether the packet contains =
a control word;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The second method is to
<span style=3D"background:yellow;mso-highlight:yellow">apply for a new labe=
l</span> when the sending<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; router advertises the contro=
l word capability,
<span style=3D"background:yellow;mso-highlight:yellow">which is used to<o:p=
></o:p></span></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;background:y=
ellow;mso-highlight:yellow;mso-fareast-language:EN-US">&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; indicate whether the control word is included in the packet</spa=
n><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Courier New=
&quot;;mso-fareast-language:EN-US">.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">My question referred just to the 2<sup>nd</sup> method,=
 while your response seems to deal with the 1<sup>st</sup> one.<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Did I miss something?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ec=
itele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> BESS [<a href=3D"mailto:bess-bounces@ietf.org">mailto:bess-boun=
ces@ietf.org</a>]
<b>On Behalf Of </b>Wanghaibo (Rainsword)<br>
<b>Sent:</b> Tuesday, October 23, 2018 12:03 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein@=
ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;;
<a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@ietf.org">draft=
-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a><br>
<b>Subject:</b> [bess] </span><span style=3D"font-family:=CB=CE=CC=E5">=B4=
=F0=B8=B4</span><span lang=3D"EN-US">: A question regarding draft-wang-bess=
-evepn-control-word<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Hi Alex=
ander,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The num=
ber of routes advertised by the Sender router in our solution will not chan=
ge, but only carries a next hop capability attribute with control word
 capability<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The Rec=
eiver router determines whether to carry the control word when forwarding p=
ackets according to its own capabilities.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The fol=
lowing figure is an example.:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">PE1----=
------PE2<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:10.5pt"><span lang=3D"EN-US" st=
yle=3D"font-size:10.5pt;font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sa=
ns-serif;color:black">|-----------PE3<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">When PE=
1 advertises a route, it carries the next hop attribute of the control word=
 capability. The routes received by PE2 and PE3 are the same.<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">If &nbs=
p;PE2 do not support the control word, it will not carry the control word w=
hen forwarding packets to PE1.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">PE1 can=
not find the control word indication label when parsing the PE2 packet. PE1=
 will treat the packet as normal.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">If &nbs=
p;PE3 support the control word, it can add a control word when forwarding t=
he packet to the PE1, and add the control word indication label specified
 by the PE1. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">When th=
e PE1 receives the packet and finds the control word indication label in th=
e packet. PE1 will correctly process the control word.<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Thanks<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Haibo<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=
=C5=BA=DA&quot;,sans-serif">=B7=A2=BC=FE=C8=CB<span lang=3D"EN-US">:</span>=
</span></b><span lang=3D"EN-US" style=3D"font-family:&quot;=CE=A2=C8=ED=D1=
=C5=BA=DA&quot;,sans-serif"> Alexander Vainshtein [<a href=3D"mailto:Alexan=
der.Vainshtein@ecitele.com">mailto:Alexander.Vainshtein@ecitele.com</a>]
<br>
</span><b><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,s=
ans-serif">=B7=A2=CB=CD=CA=B1=BC=E4<span lang=3D"EN-US">:</span></span></b>=
<span lang=3D"EN-US" style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&qu=
ot;,sans-serif"> 2018</span><span style=3D"font-family:&quot;=CE=A2=C8=ED=
=D1=C5=BA=DA&quot;,sans-serif">=C4=EA<span lang=3D"EN-US">10</span>=D4=C2<s=
pan lang=3D"EN-US">23</span>=C8=D5<span lang=3D"EN-US">
 16:46<br>
</span><b>=CA=D5=BC=FE=C8=CB<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> <a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@ietf.or=
g">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
</span><b>=B3=AD=CB=CD<span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"=
> <a href=3D"mailto:bess@ietf.org">
bess@ietf.org</a><br>
</span><b>=D6=F7=CC=E2<span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"=
> A question regarding draft-wang-bess-evepn-control-word<o:p></o:p></span>=
</span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Dear authors of <a href=3D"http=
s://tools.ietf.org/html/draft-wang-bess-evpn-control-word-00">
draft-wang-bess-evpn-control-word</a>,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I have doubts regarding at leas=
t one of the approaches for negotiating the CW usage in the EVPN encapsulat=
ion between egress and ingress PE that is defined in the draft.<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">In the case when the egress PE =
can receive EVPN-encapsulated packets both with and without CW, the draft s=
eems to propose (as one of the possibilities) advertisement of two EVPN rou=
tes for each ES or MAC/IP pair:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo2"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">One of these routes wou=
ld use the CW Capability to indicate that it refers to the EVPN encapsulati=
on that uses the CW, and would carry the appropriate label in its NLRI<o:p>=
</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo2"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">The other route would n=
ot use the CW Capability to indicate that it refers to the EVPN encapsulati=
on that does not use the CW, and carry a different label in its NLRI<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The ingress PE that accepts the=
se routes would then use one of them based on its own ability to use the CW=
 (or lack thereof), and use the corresponding label it its EVPN encapsulati=
on, while &nbsp;the DP in the egress PW would
 infer presence or absence of the CW from the received EVPN application lab=
el.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Unfortunately, I do not think t=
hat this can work because, as per
<a href=3D"https://tools.ietf.org/html/rfc7432">RFC 7432</a>, labels in the=
 labeled NLRI of EVPN routes are not part of the route key for the purpose =
of the BGP route key processing, while the label is treated just as the BGP=
 attribute. This means that, unless
 some form of BGP multi-path is enabled in the ingress PE (and in all RRs o=
n the way between the egress PE and ingress PE) for the L2VPN/EVPN &nbsp;AF=
I/SAFI, only one of these routes will be selected by the BGP selection proc=
ess.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Did I miss something substantia=
l here?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Regards, and lots of thanks in =
advance,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Office: &#43;972-39266302<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp; &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Email:&nbsp;&nbsp; <a href=3D"m=
ailto:Alexander.Vainshtein@ecitele.com">
Alexander.Vainshtein@ecitele.com</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;Times New Roman&quot;,serif"><br>
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "Wanghaibo (Rainsword)" <rainsword.wang@huawei.com>
CC: "bess@ietf.org" <bess@ietf.org>, "draft-wang-bess-evpn-control-word.authors@ietf.org" <draft-wang-bess-evpn-control-word.authors@ietf.org>
Thread-Topic: A question regarding draft-wang-bess-evepn-control-word
Thread-Index: AdRqrNk+JB1I7psBRa+73/QNemWcWQAALOQwAAKSsZAAAlraMAAC/Q+Q
Date: Tue, 23 Oct 2018 13:41:56 +0000
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Subject: Re: [bess] A question regarding draft-wang-bess-evepn-control-word
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ol
=09{margin-bottom:0cm;}
ul
=09{margin-bottom:0cm;}
--></style><!--[if gte mso 9]><xml>
<o:shapedefaults v:ext=3D"edit" spidmax=3D"1026" />
</xml><![endif]--><!--[if gte mso 9]><xml>
<o:shapelayout v:ext=3D"edit">
<o:idmap v:ext=3D"edit" data=3D"1" />
</o:shapelayout></xml><![endif]-->
</head>
<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Dear Haibo,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Again,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Lots of thanks for a prompt response.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">My reading of your response is as following:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 lev=
el1 lfo3"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-la=
nguage:EN-US"><span style=3D"mso-list:Ignore">1.<span style=3D"font:7.0pt =
&quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">All egress PEs can receive EVPN-enc=
apsulated packets
<b><i>without the CW</i></b><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 lev=
el1 lfo3"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-la=
nguage:EN-US"><span style=3D"mso-list:Ignore">2.<span style=3D"font:7.0pt =
&quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">All ingress PEs can sent EVPN-encap=
sulated packets
<b><i>without the CW</i></b><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 lev=
el1 lfo3"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-la=
nguage:EN-US"><span style=3D"mso-list:Ignore">3.<span style=3D"font:7.0pt =
&quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">An egress PE that can receive EVPN-=
encapsulated packets with the CW in the EVPN encapsulation, &nbsp;must add=
 the appropriate NH Capability attribute that
 indicates the CW-indicating label value (explicitly or implicitly) to all=
 relevant EVPN routes. &nbsp;This includes:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l0 level2 lfo3">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">a.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">Per-EVI Ethernet A-D route (EVPN Ro=
ute Type 1). In this case the CWI label would follow the label advertised =
in the NLRI of this route<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l0 level2 lfo3">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">b.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">MAC/IP Advertisement route (EVPN Ty=
pe 2 route). In this case the CWI label would follow the label advertised =
in the NLRI as Label1, it would not be
 relevant for packets that are encapsulated using Label2 (used with the Sy=
mmetric EVPN IRB).<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 lev=
el1 lfo3"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-la=
nguage:EN-US"><span style=3D"mso-list:Ignore">4.<span style=3D"font:7.0pt =
&quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">An ingress PE that has received an =
EVPN route with the CW capability attribute wand that can support usage of=
 CW in the EVPN encapsulation, will insert
 both the CWI advertised in the CW capability attribute, and the CW in the=
 EVPN packets it sends to the corresponding egress PE.&nbsp; If it does no=
t support usage of CW in the encapsulation, it will not insert this label.=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Is this understanding correct?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">If yes, I still have a couple of questions:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.7pt;text-indent:-18.=
0pt;mso-list:l1 level1 lfo4">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">1.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">Suppose that you use ingress replic=
ation (IR) to deliver BUM traffic across EVPN. The Ingress Replication lab=
el would be advertised in the PTA attribute
 of the Inclusive Multicast Ethernet Tag Route (EVPN Type 3 route); it wil=
l not be part of the NLRI. Do you expect the same logic to be used with re=
gard to CW capabilities and CWI label advertisement applied also to these =
routes?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.7pt;text-indent:-18.=
0pt;mso-list:l1 level1 lfo4">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">2.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">Per-ES Ethernet A-D Routes=20are ad=
vertised with the ECI expended Community that carries within the so-called=
 ESI label. This label is included the EVPN
 encapsulation of BUM packets sent to the PE that is attached to the same =
multi-homed ES from which the original ES packet has been received. Do you=
 expect the same logic to be used with regard to CW capabilities and CWI l=
abel advertisement applied also to
 these routes with the CWI label following the ESI label in the EVPN encap=
sulation of BUM packets?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Regards, and lots of thanks in advance,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Email:&nbsp;&nbsp; Alexander.Vainshtein@ecitele.com<o:p></o:p></span=
></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Wanghaibo (Rainsword) [mailto:rainswor=
d.wang@huawei.com]
<br>
<b>Sent:</b> Tuesday, October 23, 2018 2:34 PM<br>
<b>To:</b> Alexander Vainshtein &lt;Alexander.Vainshtein@ecitele.com&gt;<b=
r>
<b>Cc:</b> bess@ietf.org; draft-wang-bess-evpn-control-word.authors@ietf.o=
rg<br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-wor=
d<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Hi Alexander,<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The solution here is to carry=
 the next hop capability attribute when the route is advertised. The capab=
ility carried here is the control word capability.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The specific format of the ne=
xt hop capability can be referred to the draft.:
<b>&lt;draft-ietf-idr-next-hop-capability&gt;<o:p></o:p></b></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | Capability Code (2 octets)&nbsp;&nbsp; |<o:p></o:p></=
span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | Capability Length (2 octets) |<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | Capability Value (variable)&nbsp; |<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; ~&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ~<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">For the control word capabili=
ty , it may encode as :<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | CW Capabality Type (TBD)&nbsp; &nbsp;&nbsp;&nbsp;|<o:=
p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | CW Length (0 or 3) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | CWI Label (may not exist) &nbsp;&nbsp;&nbsp;|<o:p></o=
:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">CWI (Control word indication)=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">And the forwarding Packet exa=
mple.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&#43;------------------------------&#43;<o:p></o:p=
></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | Tunnel Label &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | EVI Label&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o=
:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | CW Indicate Label &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | Control word&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The difference between the tw=
o methods is that which value should be use for the control word capabilit=
y indicates label.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Method 1, use reserved label,=
 which should be assigned by IANA, (such as the entropy label, which is th=
e value of 7)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">If we use this method, then t=
he control word capability attribute<span lang=3D"ZH-CN">=A1=AF</span>s CW=
 length use 0 is enough.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span=20style=3D"font-size:10.5pt;font-family:&quot=
;Microsoft YaHei&quot;,sans-serif;color:black">And the forwarding packet u=
se the IANA specified value as the CWI (Control word indication) Label .(P=
erhaps 8 or others)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Method2, use normal value, wh=
ich is assigned by router.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">If we use this method, then t=
he router must assign a label used for the CWI. Perhaps label. And the con=
trol word capability attribute<span lang=3D"ZH-CN">=A1=AF</span>s
 CW length must be 3 and must contain the value in the update message.<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The forwarding packet must us=
e that value as the CWI label.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Regards,<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Haibo<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein [<a href=3D"mailt=
o:Alexander.Vainshtein@ecitele.com">mailto:Alexander.Vainshtein@ecitele.co=
m</a>]
<br>
<b>Sent:</b> Tuesday, October 23, 2018 6:09 PM<br>
<b>To:</b> Wanghaibo (Rainsword) &lt;<a href=3D"mailto:rainsword.wang@huaw=
ei.com">rainsword.wang@huawei.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; <a href=3D"=
mailto:draft-wang-bess-evpn-control-word.authors@ietf.org">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-wor=
d<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Dear Haibo,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Lots of thanks for an extra-prompt response to my question.<o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">There may be some misunderstanding here.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">The draft says (the important text is highlighted):<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US">&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;There are
<span style=3D"background:yellow;mso-highlight:yellow">two methods</span> =
to specified the control word indicator label:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The first method is to ap=
ply for a reserved label to indicate<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US">&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;whether the packet contai=
ns a control word;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The second method is to
<span style=3D"background:yellow;mso-highlight:yellow">apply for a new lab=
el</span> when the sending<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; router advertises the con=
trol word capability,
<span style=3D"background:yellow;mso-highlight:yellow">which is used to<o:=
p></o:p></span></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;background=
:yellow;mso-highlight:yellow;mso-fareast-language:EN-US">&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; indicate whether the control word is included in the packet<=
/span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Courie=
r New&quot;;mso-fareast-language:EN-US">.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">My question referred just to the 2<sup>nd</sup> method, while your r=
esponse seems to deal with the 1<sup>st</sup> one.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Did I miss something?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@e=
citele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> BESS [<a href=3D"mailto:bess-bounces@i=
etf.org">mailto:bess-bounces@ietf.org</a>]
<b>On Behalf Of </b>Wanghaibo (Rainsword)<br>
<b>Sent:</b> Tuesday, October 23, 2018 12:03 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein=
@ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;;
<a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@ietf.org">draf=
t-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a><br>
<b>Subject:</b> [bess] <span lang=3D"ZH-CN" style=3D"font-family:SimSun">=B4=
=F0=B8=B4</span>: A question regarding draft-wang-bess-evepn-control-word<=
o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Hi Alexander,<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The number of routes advertis=
ed by the Sender router in our solution will not change, but only carries =
a next hop capability attribute with control word
 capability<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The Receiver router determine=
s whether to carry the control word when forwarding packets according to i=
ts own capabilities.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The following figure is an ex=
ample.:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">PE1----------PE2<o:p></o:p></=
span></p>
<p class=3D"MsoNormal" style=3D"text-indent:10.5pt"><span style=3D"font-si=
ze:10.5pt;font-family:&quot;Microsoft YaHei&quot;,sans-serif;color:black">=
|-----------PE3<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">When PE1 advertises a route, =
it carries the next hop attribute of the control word capability. The rout=
es received by PE2 and PE3 are the same.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">If &nbsp;PE2 do not support t=
he control word, it will not carry the control word when forwarding packet=
s to PE1.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">PE1 cannot find the control w=
ord indication label when parsing the PE2 packet. PE1 will treat the packe=
t as normal.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">If &nbsp;PE3 support the cont=
rol word, it can add a control word when forwarding the packet to the PE1,=
 and add the control word indication label specified by
 the PE1. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">When the PE1 receives the pac=
ket and finds the control word indication label in the packet. PE1 will=20=
correctly process the control word.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Thanks<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Haibo<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"ZH-CN" style=3D"font-family:&quot;=
Microsoft YaHei&quot;,sans-serif">=B7=A2=BC=FE=C8=CB</span></b><b><span st=
yle=3D"font-family:&quot;Microsoft YaHei&quot;,sans-serif">:</span></b><sp=
an style=3D"font-family:&quot;Microsoft YaHei&quot;,sans-serif"> Alexander=
 Vainshtein [<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">mailto:Al=
exander.Vainshtein@ecitele.com</a>]
<br>
<b><span lang=3D"ZH-CN">=B7=A2=CB=CD=CA=B1=BC=E4</span>:</b> 2018<span lan=
g=3D"ZH-CN">=C4=EA</span>10<span lang=3D"ZH-CN">=D4=C2</span>23<span lang=3D=
"ZH-CN">=C8=D5</span> 16:46<br>
<b><span lang=3D"ZH-CN">=CA=D5=BC=FE=C8=CB</span>:</b> <a href=3D"mailto:d=
raft-wang-bess-evpn-control-word.authors@ietf.org">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b><span lang=3D"ZH-CN">=B3=AD=CB=CD</span>:</b> <a href=3D"mailto:bess@ie=
tf.org">bess@ietf.org</a><br>
<b><span lang=3D"ZH-CN">=D6=F7=CC=E2</span>:</b> A question regarding draf=
t-wang-bess-evepn-control-word<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Dear authors of <a href=3D"https://tools.ietf.org/h=
tml/draft-wang-bess-evpn-control-word-00">
draft-wang-bess-evpn-control-word</a>,<o:p></o:p></p>
<p class=3D"MsoNormal">I have doubts regarding at least one of the approac=
hes for negotiating the CW usage in the EVPN encapsulation between egress =
and ingress PE that is defined in the draft.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">In the case when the egress PE can receive EVPN-enc=
apsulated packets both with and without CW, the draft seems to propose (as=
 one of the possibilities) advertisement of two EVPN routes for each ES or=
 MAC/IP pair:<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l2 lev=
el1 lfo2"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span styl=
e=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]><span dir=3D"LTR"></span>One of these routes would=
 use the CW Capability to indicate that it refers to the EVPN encapsulatio=
n that uses the CW, and would carry the appropriate label in its NLRI<o:p>=
</o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l2 lev=
el1 lfo2"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span styl=
e=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]><span dir=3D"LTR"></span>The other route would not=
 use the CW Capability to indicate that it refers to the EVPN encapsulatio=
n that does not use the CW, and carry a different label in its NLRI<o:p></=
o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The ingress PE that accepts these routes would then=
 use one of them based on its own ability to use the CW (or lack thereof),=
 and use the corresponding label it its EVPN encapsulation, while &nbsp;th=
e DP in the egress PW would infer presence
 or absence of the CW from the received EVPN application label.<o:p></o:p>=
</p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Unfortunately, I do not think that this can work be=
cause, as per
<a href=3D"https://tools.ietf.org/html/rfc7432">RFC 7432</a>, labels in th=
e labeled NLRI of EVPN routes are not part of the route key for the purpos=
e of the BGP route key processing, while the label is treated just as the =
BGP attribute. This means that, unless
 some form of BGP multi-path is enabled in the ingress PE (and in all RRs =
on the way between the egress PE and ingress PE) for the L2VPN/EVPN &nbsp;=
AFI/SAFI, only one of these routes will be selected by the BGP selection p=
rocess.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Did I miss something substantial here?<o:p></o:p></=
p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p><=
/p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Office: &#43;972-39266302<o:p></o:p></p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266=
302<o:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; <a href=3D"mailto:Alexander.Vain=
shtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;T=
imes New Roman&quot;,serif"><br>
__________________________________________________________________________=
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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi Sasha,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I am also thinking of =
this recently but haven=A1=AFt talked with author yet.<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">What was in my mind th=
e solution is actually simple: directly tear down (part of) the mac-VRF or =
EVI directly if CW capabilities not consistent, considering behavior in one=
 EVI should keep consistent (personally
 believe). &nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I might tend to the me=
chanism as below:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">If router A has CW cap=
abilities and receive type 1 or type 2 routes without CW, then A should dro=
p these routes and report an alarm.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">If router A does not h=
as CW capabilities and receive type 1 or type 2 routes with CW, then A shou=
ld drop these routes and report an alarm.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I believe the behavior=
 within EVI or Mac-VRF should keep consistent, otherwise, more questions wi=
ll pop out.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Considering if a servi=
ce is sensitive to packet misordering and it is ELAN, I tend to keep behavi=
or within this ELAN consistent.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">There could also be ot=
her problems with this approach, just share an idea so far open the discuss=
ion.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Regards, and lots of thanks in advance,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Tim<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> BESS [mailto:bess-bounces@ietf.org] <b>=
On Behalf Of
</b>Alexander Vainshtein<br>
<b>Sent:</b> 23 October 2018 14:42<br>
<b>To:</b> Wanghaibo (Rainsword) &lt;rainsword.wang@huawei.com&gt;<br>
<b>Cc:</b> draft-wang-bess-evpn-control-word.authors@ietf.org; bess@ietf.or=
g<br>
<b>Subject:</b> Re: [bess] A question regarding draft-wang-bess-evepn-contr=
ol-word<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Dear Haibo,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Again,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Lots of thanks for a prompt response.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">My reading of your response is as following:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo2"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-lang=
uage:EN-US"><span style=3D"mso-list:Ignore">1.<span style=3D"font:7.0pt &qu=
ot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">All egress PEs can receive EVPN-encapsulated packets
<b><i>without the CW</i></b><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo2"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-lang=
uage:EN-US"><span style=3D"mso-list:Ignore">2.<span style=3D"font:7.0pt &qu=
ot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">All ingress PEs can sent EVPN-encapsulated packets
<b><i>without the CW</i></b><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo2"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-lang=
uage:EN-US"><span style=3D"mso-list:Ignore">3.<span style=3D"font:7.0pt &qu=
ot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">An egress PE that can receive EVPN-encapsulated packets with t=
he CW in the EVPN encapsulation, &nbsp;must add the appropriate NH Capabili=
ty attribute that indicates the CW-indicating
 label value (explicitly or implicitly) to all relevant EVPN routes. &nbsp;=
This includes:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l0 level2 lfo2">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">a.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">Per-EVI Ethernet A-D route (EVPN Route Type 1). In this case t=
he CWI label would follow the label advertised in the NLRI of this route<o:=
p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l0 level2 lfo2">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">b.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">MAC/IP Advertisement route (EVPN Type 2 route). In this case t=
he CWI label would follow the label advertised in the NLRI as Label1, it wo=
uld not be relevant for packets that
 are encapsulated using Label2 (used with the Symmetric EVPN IRB).<o:p></o:=
p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo2"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-lang=
uage:EN-US"><span style=3D"mso-list:Ignore">4.<span style=3D"font:7.0pt &qu=
ot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">An ingress PE that has received an EVPN route with the CW capa=
bility attribute wand that can support usage of CW in the EVPN encapsulatio=
n, will insert both the CWI advertised
 in the CW capability attribute, and the CW in the EVPN packets it sends to=
 the corresponding egress PE.&nbsp; If it does not support usage of CW in t=
he encapsulation, it will not insert this label.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Is this understanding correct?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">If yes, I still have a couple of questions:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.7pt;text-indent:-18.0=
pt;mso-list:l1 level1 lfo4">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">1.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">Suppose that you use ingress replication (IR) to deliver BUM t=
raffic across EVPN. The Ingress Replication label would be advertised in th=
e PTA attribute of the Inclusive Multicast
 Ethernet Tag Route (EVPN Type 3 route); it will not be part of the NLRI. D=
o you expect the same logic to be used with regard to CW capabilities and C=
WI label advertisement applied also to these routes?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.7pt;text-indent:-18.0=
pt;mso-list:l1 level1 lfo4">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">2.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">Per-ES Ethernet A-D Routes are advertised with the ECI expende=
d Community that carries within the so-called ESI label. This label is incl=
uded the EVPN encapsulation of BUM
 packets sent to the PE that is attached to the same multi-homed ES from wh=
ich the original ES packet has been received. Do you expect the same logic =
to be used with regard to CW capabilities and CWI label advertisement appli=
ed also to these routes with the
 CWI label following the ESI label in the EVPN encapsulation of BUM packets=
?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Regards, and lots of thanks in advance,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ec=
itele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Wanghaibo (Rainsword) [<a href=3D"mailt=
o:rainsword.wang@huawei.com">mailto:rainsword.wang@huawei.com</a>]
<br>
<b>Sent:</b> Tuesday, October 23, 2018 2:34 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein@=
ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; <a href=3D"m=
ailto:draft-wang-bess-evpn-control-word.authors@ietf.org">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-word=
<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Hi Alexander,<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The solution here is=
 to carry the next hop capability attribute when the route is advertised. T=
he capability carried here is the control word capability.<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The specific format =
of the next hop capability can be referred to the draft.:
<b>&lt;draft-ietf-idr-next-hop-capability&gt;<o:p></o:p></b></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | Capability Code (2 octets)&nbsp;&nbsp; |<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | Capability Length (2 octets) |<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | Capability Value (variable)&nbsp; |<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; ~&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ~<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">For the control word=
 capability , it may encode as :<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | CW Capabality Type (TBD)&nbsp; &nbsp;&nbsp;&nbsp;|<o:p></=
o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | CW Length (0 or 3) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | CWI Label (may not exist) &nbsp;&nbsp;&nbsp;|<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">CWI (Control word in=
dication)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">And the forwarding P=
acket example.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&#43;------------------------------&#43;<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | Tunnel Label &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | EVI Label&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></=
o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | CW Indicate Label &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | Control word&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The difference betwe=
en the two methods is that which value should be use for the control word c=
apability indicates label.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Method 1, use reserv=
ed label, which should be assigned by IANA, (such as the entropy label, whi=
ch is the value of 7)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">If we use this metho=
d, then the control word capability attribute<span lang=3D"ZH-CN">=A1=AF</s=
pan>s CW length use 0 is enough.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">And the forwarding p=
acket use the IANA specified value as the CWI (Control word indication) Lab=
el .(Perhaps 8 or others)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Method2, use normal =
value, which is assigned by router.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">If we use this metho=
d, then the router must assign a label used for the CWI. Perhaps label. And=
 the control word capability attribute<span lang=3D"ZH-CN">=A1=AF</span>s C=
W
 length must be 3 and must contain the value in the update message.<o:p></o=
:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The forwarding packe=
t must use that value as the CWI label.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Regards,<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Haibo<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein [<a href=3D"mailto=
:Alexander.Vainshtein@ecitele.com">mailto:Alexander.Vainshtein@ecitele.com<=
/a>]
<br>
<b>Sent:</b> Tuesday, October 23, 2018 6:09 PM<br>
<b>To:</b> Wanghaibo (Rainsword) &lt;<a href=3D"mailto:rainsword.wang@huawe=
i.com">rainsword.wang@huawei.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; <a href=3D"m=
ailto:draft-wang-bess-evpn-control-word.authors@ietf.org">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-word=
<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Dear Haibo,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Lots of thanks for an extra-prompt response to my question.<o:p></o:p>=
</span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">There may be some misunderstanding here.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">The draft says (the important text is highlighted):<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;There are
<span style=3D"background:yellow;mso-highlight:yellow">two methods</span> t=
o specified the control word indicator label:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The first method is to apply=
 for a reserved label to indicate<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;whether the packet contains =
a control word;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The second method is to
<span style=3D"background:yellow;mso-highlight:yellow">apply for a new labe=
l</span> when the sending<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; router advertises the contro=
l word capability,
<span style=3D"background:yellow;mso-highlight:yellow">which is used to<o:p=
></o:p></span></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;background:y=
ellow;mso-highlight:yellow;mso-fareast-language:EN-US">&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; indicate whether the control word is included in the packet</spa=
n><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Courier New=
&quot;;mso-fareast-language:EN-US">.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">My question referred just to the 2<sup>nd</sup> method, while your res=
ponse seems to deal with the 1<sup>st</sup> one.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Did I miss something?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ec=
itele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> BESS [<a href=3D"mailto:bess-bounces@ie=
tf.org">mailto:bess-bounces@ietf.org</a>]
<b>On Behalf Of </b>Wanghaibo (Rainsword)<br>
<b>Sent:</b> Tuesday, October 23, 2018 12:03 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein@=
ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;;
<a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@ietf.org">draft=
-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a><br>
<b>Subject:</b> [bess] <span lang=3D"ZH-CN" style=3D"font-family:SimSun">=
=B4=F0=B8=B4</span>: A question regarding draft-wang-bess-evepn-control-wor=
d<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Hi Alexander,<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The number of routes=
 advertised by the Sender router in our solution will not change, but only =
carries a next hop capability attribute with control word capability<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The Receiver router =
determines whether to carry the control word when forwarding packets accord=
ing to its own capabilities.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The following figure=
 is an example.:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">PE1----------PE2<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:10.5pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:=
black">|-----------PE3<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">When PE1 advertises =
a route, it carries the next hop attribute of the control word capability. =
The routes received by PE2 and PE3 are the same.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">If &nbsp;PE2 do not =
support the control word, it will not carry the control word when forwardin=
g packets to PE1.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">PE1 cannot find the =
control word indication label when parsing the PE2 packet. PE1 will treat t=
he packet as normal.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">If &nbsp;PE3 support=
 the control word, it can add a control word when forwarding the packet to =
the PE1, and add the control word indication label specified by the PE1.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">When the PE1 receive=
s the packet and finds the control word indication label in the packet. PE1=
 will correctly process the control word.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Thanks<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Haibo<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"ZH-CN" style=3D"font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif">=B7=A2=BC=FE=C8=CB</span></b><b>=
<span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif"=
>:</span></b><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot=
;,sans-serif"> Alexander Vainshtein [<a href=3D"mailto:Alexander.Vainshtein=
@ecitele.com">mailto:Alexander.Vainshtein@ecitele.com</a>]
<br>
<b><span lang=3D"ZH-CN">=B7=A2=CB=CD=CA=B1=BC=E4</span>:</b> 2018<span lang=
=3D"ZH-CN">=C4=EA</span>10<span lang=3D"ZH-CN">=D4=C2</span>23<span lang=3D=
"ZH-CN">=C8=D5</span> 16:46<br>
<b><span lang=3D"ZH-CN">=CA=D5=BC=FE=C8=CB</span>:</b> <a href=3D"mailto:dr=
aft-wang-bess-evpn-control-word.authors@ietf.org">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b><span lang=3D"ZH-CN">=B3=AD=CB=CD</span>:</b> <a href=3D"mailto:bess@iet=
f.org">bess@ietf.org</a><br>
<b><span lang=3D"ZH-CN">=D6=F7=CC=E2</span>:</b> A question regarding draft=
-wang-bess-evepn-control-word<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Dear authors of <a href=3D"https://tools.ietf.org/ht=
ml/draft-wang-bess-evpn-control-word-00">
draft-wang-bess-evpn-control-word</a>,<o:p></o:p></p>
<p class=3D"MsoNormal">I have doubts regarding at least one of the approach=
es for negotiating the CW usage in the EVPN encapsulation between egress an=
d ingress PE that is defined in the draft.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">In the case when the egress PE can receive EVPN-enca=
psulated packets both with and without CW, the draft seems to propose (as o=
ne of the possibilities) advertisement of two EVPN routes for each ES or MA=
C/IP pair:<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l2 leve=
l1 lfo6"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>One of these routes would use the CW Capability to =
indicate that it refers to the EVPN encapsulation that uses the CW, and wou=
ld carry the appropriate label in its NLRI<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l2 leve=
l1 lfo6"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>The other route would not use the CW Capability to =
indicate that it refers to the EVPN encapsulation that does not use the CW,=
 and carry a different label in its NLRI<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The ingress PE that accepts these routes would then =
use one of them based on its own ability to use the CW (or lack thereof), a=
nd use the corresponding label it its EVPN encapsulation, while &nbsp;the D=
P in the egress PW would infer presence
 or absence of the CW from the received EVPN application label.<o:p></o:p><=
/p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Unfortunately, I do not think that this can work bec=
ause, as per
<a href=3D"https://tools.ietf.org/html/rfc7432">RFC 7432</a>, labels in the=
 labeled NLRI of EVPN routes are not part of the route key for the purpose =
of the BGP route key processing, while the label is treated just as the BGP=
 attribute. This means that, unless
 some form of BGP multi-path is enabled in the ingress PE (and in all RRs o=
n the way between the egress PE and ingress PE) for the L2VPN/EVPN &nbsp;AF=
I/SAFI, only one of these routes will be selected by the BGP selection proc=
ess.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Did I miss something substantial here?<o:p></o:p></p=
>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p></=
p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Office: &#43;972-39266302<o:p></o:p></p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-5492663=
02<o:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; <a href=3D"mailto:Alexander.Vains=
htein@ecitele.com">Alexander.Vainshtein@ecitele.com</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ti=
mes New Roman&quot;,serif"><br>
___________________________________________________________________________=
<br>
<br>
This e-mail message is intended for the recipient only and contains informa=
tion which is
<br>
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have recei=
ved this
<br>
transmission in error, please inform us by e-mail, phone or fax, and then d=
elete the original
<br>
and all copies thereof.<br>
___________________________________________________________________________=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:SimSun">=
<br>
___________________________________________________________________________=
<br>
<br>
This e-mail message is intended for the recipient only and contains informa=
tion which is
<br>
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have recei=
ved this
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transmission in error, please inform us by e-mail, phone or fax, and then d=
elete the original
<br>
and all copies thereof.<br>
___________________________________________________________________________=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:SimSun">=
<br>
___________________________________________________________________________=
<br>
<br>
This e-mail message is intended for the recipient only and contains informa=
tion which is
<br>
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have recei=
ved this
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transmission in error, please inform us by e-mail, phone or fax, and then d=
elete the original
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--_000_35FF0D51C8DAB54B95B0426331F984FF5208500Alhreml523mbxchi_--


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From: Alissa Cooper <alissa@cooperw.in>
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Date: Tue, 23 Oct 2018 17:55:53 +0200
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Subject: Re: [bess] [Gen-art] Genart telechat review of draft-ietf-bess-mvpn-expl-track-12
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Brian, thanks for your reviews. Eric, thanks for your responses. I =
entered a No Objection ballot.

Alissa

> On Oct 12, 2018, at 7:10 AM, Brian Carpenter =
<brian.e.carpenter@gmail.com> wrote:
>=20
> Reviewer: Brian Carpenter
> Review result: Ready
>=20
> Gen-ART telechat review of draft-ietf-bess-mvpn-expl-track-12
>=20
> I am the assigned Gen-ART reviewer for this draft. The General Area
> Review Team (Gen-ART) reviews all IETF documents being processed
> by the IESG for the IETF Chair. Please wait for direction from your
> document shepherd or AD before posting a new version of the draft.
>=20
> For more information, please see the FAQ at
> <http://wiki.tools.ietf.org/area/gen/trac/wiki/GenArtfaq>.
>=20
> Document: draft-ietf-bess-mvpn-expl-track-12.txt
> Reviewer: Brian Carpenter
> Review Date: 2018-10-12
> IETF LC End Date: 2018-10-09
> IESG Telechat date: 2018-10-25=20
>=20
> Summary: Ready
> --------
>=20
> Comments:=20
> ---------
> Thank you for handling my Last Call comments.
>=20
> _______________________________________________
> Gen-art mailing list
> Gen-art@ietf.org
> https://www.ietf.org/mailman/listinfo/gen-art


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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "Yutianpeng (Tim)" <yutianpeng@huawei.com>
CC: "draft-wang-bess-evpn-control-word.authors@ietf.org" <draft-wang-bess-evpn-control-word.authors@ietf.org>, "bess@ietf.org" <bess@ietf.org>, "Wanghaibo (Rainsword)" <rainsword.wang@huawei.com>
Thread-Topic: A question regarding draft-wang-bess-evepn-control-word
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Subject: Re: [bess] A question regarding draft-wang-bess-evepn-control-word
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</head>
<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Tim,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Lots of thanks for sharing your views.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Unfortunately, I doubt the approach that you propose: always use or =
do not use CW in the same EVI.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">The problem, as I see it is that known unicast and BUM traffic may b=
e handled differently when it comes to EVPN encapsulation:<o:p></o:p></spa=
n></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l2 lev=
el1 lfo7"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-la=
nguage:EN-US"><span style=3D"mso-list:Ignore">1.<span style=3D"font:7.0pt =
&quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">Section 18 of RFC 7432 explicitly s=
tates that =A1=B0When sending EVPN-encapsulated packets over a P2MP LSP or=
 P2P LSP, then the control word SHOULD NOT be
 used=A1=B1<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l2 level2 lfo7">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">a.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">This recommendation is quite reason=
able because the LSPs in question are not affected by ECMP, so there is no=
 need to use the CW to prevent ECMP-cause
 reordering<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l2 level2 lfo7">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">b.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">It is quite possible to P2MP LSPs=20=
as the P-tunneling technology delivery of BUM traffic in EVPN while using =
MP2P LSPs for carrying known unicast traffic<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l2 level2 lfo7">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">c.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><b><span style=3D"=
color:#1F497D;mso-fareast-language:EN-US">The bottom line</span></b><span =
style=3D"color:#1F497D;mso-fareast-language:EN-US">: RFC 7432 defines the =
&nbsp;scenario when the CW SHOULD be used in the
 EVPN encapsulation of the known unicast traffic but SHOULD NOT be used in=
 the EVPN encapsulation of BUM traffic as valid<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l2 lev=
el1 lfo7"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-la=
nguage:EN-US"><span style=3D"mso-list:Ignore">2.<span style=3D"font:7.0pt =
&quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">I am aware (this information is pub=
licly available) of at least one deployed EVPN implementation that:<o:p></=
o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l2 level2 lfo7">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">a.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">By default includes the CW in the E=
VPN encapsulation of known unicast traffic (this default behavior can be d=
isabled by explicit configuration)<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l2 level2 lfo7">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">b.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">Does not include the CW in the EVPN=
 encapsulation of BUM traffic, presumably due to limitations imposed by th=
e forwarding HW.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l2 level2 lfo7">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">c.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><b><span style=3D"=
color:#1F497D;mso-fareast-language:EN-US">The bottom line</span></b><span =
style=3D"color:#1F497D;mso-fareast-language:EN-US">: inconsistent usage of=
 CW in the EVPN encapsulation within the
 same EVI (with differences between known unicast and BUM traffic) is alre=
ady a fact on the ground (at least, to some extent).<o:p></o:p></span></p>=

<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">My 2c,</span><span style=3D"color:#1F497D;mso-fareast-language:EN-US=
"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Email:&nbsp;&nbsp; Alexander.Vainshtein@ecitele.com<o:p></o:p></span=
></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Yutianpeng (Tim) [mailto:yutianpeng@hu=
awei.com]
<br>
<b>Sent:</b> Tuesday, October 23, 2018 5:48 PM<br>
<b>To:</b> Alexander Vainshtein &lt;Alexander.Vainshtein@ecitele.com&gt;; =
Wanghaibo (Rainsword) &lt;rainsword.wang@huawei.com&gt;<br>
<b>Cc:</b> draft-wang-bess-evpn-control-word.authors@ietf.org; bess@ietf.o=
rg<br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-wor=
d<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi Sasha,<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I am also thinking of=
 this recently but haven=A1=AFt talked with author yet.<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">What was in my mind t=
he solution=20is actually simple: directly tear down (part of) the mac-VRF=
 or EVI directly if CW capabilities not consistent, considering behavior i=
n one EVI should keep consistent (personally
 believe). &nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I might tend to the m=
echanism as below:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">If router A has CW ca=
pabilities and receive type 1 or type 2 routes without CW, then A should d=
rop these routes and report an alarm.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">If router A does not =
has CW capabilities and receive type 1 or type 2 routes with CW, then A sh=
ould drop these routes and report an alarm.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I believe the behavio=
r within EVI or Mac-VRF should keep consistent, otherwise, more questions =
will pop out.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Considering if a serv=
ice is sensitive to packet misordering and it is ELAN, I tend to keep beha=
vior within this ELAN consistent.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">There could also be o=
ther problems with this approach, just share an idea so far open the discu=
ssion.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Regards, and lots of thanks in advance,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Tim<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> BESS [<a href=3D"mailto:bess-bounces@i=
etf.org">mailto:bess-bounces@ietf.org</a>]
<b>On Behalf Of </b>Alexander Vainshtein<br>
<b>Sent:</b> 23 October 2018 14:42<br>
<b>To:</b> Wanghaibo (Rainsword) &lt;<a href=3D"mailto:rainsword.wang@huaw=
ei.com">rainsword.wang@huawei.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@iet=
f.org">draft-wang-bess-evpn-control-word.authors@ietf.org</a>;
<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a><br>
<b>Subject:</b> Re: [bess] A question regarding draft-wang-bess-evepn-cont=
rol-word<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Dear Haibo,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Again,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Lots of thanks for a prompt response.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">My reading of your response is as following:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 lev=
el1 lfo2"><![if !supportLists]><span=20style=3D"color:#1F497D;mso-fareast-=
language:EN-US"><span style=3D"mso-list:Ignore">1.<span style=3D"font:7.0p=
t &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">All egress PEs can receive EVPN-enc=
apsulated packets
<b><i>without the CW</i></b><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 lev=
el1 lfo2"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-la=
nguage:EN-US"><span style=3D"mso-list:Ignore">2.<span style=3D"font:7.0pt =
&quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">All ingress PEs can sent EVPN-encap=
sulated packets
<b><i>without the CW</i></b><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 lev=
el1 lfo2"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-la=
nguage:EN-US"><span style=3D"mso-list:Ignore">3.<span style=3D"font:7.0pt =
&quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">An egress PE that can receive EVPN-=
encapsulated packets with the CW in the EVPN encapsulation, &nbsp;must add=
 the appropriate NH Capability attribute that
 indicates the CW-indicating label value (explicitly or implicitly) to all=
 relevant EVPN routes. &nbsp;This includes:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l0 level2 lfo2">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">a.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">Per-EVI Ethernet A-D route (EVPN Ro=
ute Type 1). In this case the CWI label would follow the label advertised =
in the NLRI of this route<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l0 level2 lfo2">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">b.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">MAC/IP Advertisement route (EVPN Ty=
pe 2 route). In this case the CWI label would follow the label advertised =
in the NLRI as Label1, it would not be
 relevant for packets that are encapsulated using Label2 (used with the Sy=
mmetric EVPN IRB).<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 lev=
el1 lfo2"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-la=
nguage:EN-US"><span style=3D"mso-list:Ignore">4.<span style=3D"font:7.0pt =
&quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">An ingress PE that has received an =
EVPN route with the CW capability attribute wand that can support usage of=
 CW in the EVPN encapsulation, will insert
 both the CWI advertised in the CW capability attribute, and the CW in the=
 EVPN packets it sends to the corresponding egress PE.&nbsp; If it does no=
t support usage of CW in the encapsulation, it will not insert this label.=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Is this understanding correct?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">If yes, I still have a couple of questions:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.7pt;text-indent:-18.=
0pt;mso-list:l1 level1 lfo4">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">1.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">Suppose that you use ingress replic=
ation (IR) to deliver BUM traffic across EVPN. The Ingress Replication lab=
el would be advertised in the PTA attribute
 of the Inclusive Multicast Ethernet Tag Route (EVPN Type 3 route); it wil=
l not be part of the NLRI. Do you expect the same logic to be used with re=
gard to CW capabilities and CWI label advertisement applied also to these =
routes?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.7pt;text-indent:-18.=
0pt;mso-list:l1 level1 lfo4">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">2.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">Per-ES Ethernet A-D Routes are adve=
rtised with the ECI expended Community that carries within the so-called E=
SI label. This label is included the EVPN
 encapsulation of BUM packets sent to the PE that is attached to the same =
multi-homed ES from which the original ES packet has been received. Do you=
 expect the same logic to be used with regard to CW capabilities and CWI l=
abel advertisement applied also to
 these routes with the CWI label following the ESI label in the EVPN encap=
sulation of BUM packets?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Regards, and lots of thanks in advance,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@e=
citele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Wanghaibo (Rainsword) [<a href=3D"mail=
to:rainsword.wang@huawei.com">mailto:rainsword.wang@huawei.com</a>]
<br>
<b>Sent:</b> Tuesday, October 23, 2018 2:34 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein=
@ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; <a href=3D"=
mailto:draft-wang-bess-evpn-control-word.authors@ietf.org">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-wor=
d<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Hi Alexander,<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The solution here is to carry=
 the next hop capability attribute when the route is advertised. The capab=
ility carried here is the control word capability.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The specific format of the ne=
xt hop capability can be referred to the draft.:
<b>&lt;draft-ietf-idr-next-hop-capability&gt;<o:p></o:p></b></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | Capability Code (2 octets)&nbsp;&nbsp; |<o:p></o:p></=
span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | Capability Length (2 octets) |<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | Capability Value (variable)&nbsp; |<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; ~&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ~<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">For the control word capabili=
ty , it may encode as :<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | CW Capabality Type (TBD)&nbsp; &nbsp;&nbsp;&nbsp;|<o:=
p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | CW Length (0 or 3) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | CWI Label (may not exist) &nbsp;&nbsp;&nbsp;|<o:p></o=
:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">CWI (Control word indication)=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">And the forwarding Packet exa=
mple.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&#43;------------------------------&#43;<o:p></o:p=
></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | Tunnel Label &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | EVI Label&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o=
:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | CW Indicate Label &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | Control word&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The difference between the tw=
o methods is that which value should be use for the control word capabilit=
y indicates label.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Method 1, use reserved label,=
 which should be assigned by IANA, (such as the entropy label, which is th=
e value of 7)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">If we use this method, then t=
he control word capability attribute<span lang=3D"ZH-CN">=A1=AF</span>s CW=
 length use 0 is enough.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">And the forwarding packet use=
 the IANA specified value as the CWI (Control word indication) Label .(Per=
haps 8 or others)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Method2, use normal value, wh=
ich is assigned by router.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">If we use this method, then t=
he router must assign a label used for the CWI. Perhaps label. And the con=
trol word capability attribute<span lang=3D"ZH-CN">=A1=AF</span>s
 CW length must be 3 and must contain the value in the update message.<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The forwarding packet must us=
e that value as the CWI label.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Regards,<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Haibo<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein [<a href=3D"mailt=
o:Alexander.Vainshtein@ecitele.com">mailto:Alexander.Vainshtein@ecitele.co=
m</a>]
<br>
<b>Sent:</b> Tuesday, October 23, 2018 6:09 PM<br>
<b>To:</b> Wanghaibo (Rainsword) &lt;<a href=3D"mailto:rainsword.wang@huaw=
ei.com">rainsword.wang@huawei.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; <a href=3D"=
mailto:draft-wang-bess-evpn-control-word.authors@ietf.org">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-wor=
d<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Dear Haibo,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Lots of thanks for an extra-prompt response to my question.<o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">There may be some misunderstanding here.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">The draft says (the important text is highlighted):<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US">&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;There are
<span style=3D"background:yellow;mso-highlight:yellow">two methods</span> =
to specified the control word indicator label:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The first method is to ap=
ply for a reserved label to indicate<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US">&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;whether the packet contai=
ns a control word;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The second method is to
<span style=3D"background:yellow;mso-highlight:yellow">apply for a new lab=
el</span> when the sending<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; router advertises the con=
trol word capability,
<span style=3D"background:yellow;mso-highlight:yellow">which is used to<o:=
p></o:p></span></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;background=
:yellow;mso-highlight:yellow;mso-fareast-language:EN-US">&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; indicate whether the control word is included in the packet<=
/span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Courie=
r New&quot;;mso-fareast-language:EN-US">.<o:p></o:p></span></p>
<p class=3D"MsoNormal"=20style=3D"page-break-before:always"><span lang=3D"=
EN" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">My question referred just to the 2<sup>nd</sup> method, while your r=
esponse seems to deal with the 1<sup>st</sup> one.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Did I miss something?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@e=
citele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> BESS [<a href=3D"mailto:bess-bounces@i=
etf.org">mailto:bess-bounces@ietf.org</a>]
<b>On Behalf Of </b>Wanghaibo (Rainsword)<br>
<b>Sent:</b> Tuesday, October 23, 2018 12:03 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein=
@ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;;
<a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@ietf.org">draf=
t-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a><br>
<b>Subject:</b> [bess] <span lang=3D"ZH-CN" style=3D"font-family:SimSun">=B4=
=F0=B8=B4</span>: A question regarding draft-wang-bess-evepn-control-word<=
o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Hi Alexander,<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The number of routes advertis=
ed by the Sender router in our solution will not change, but only carries =
a next hop capability attribute with control word
 capability<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The Receiver router determine=
s whether to carry the control word when forwarding packets according to i=
ts own capabilities.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The following figure is an ex=
ample.:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">PE1----------PE2<o:p></o:p></=
span></p>
<p class=3D"MsoNormal" style=3D"text-indent:10.5pt"><span style=3D"font-si=
ze:10.5pt;font-family:&quot;Microsoft YaHei&quot;,sans-serif;color:black">=
|-----------PE3<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">When PE1 advertises a route, =
it carries the next hop attribute of the control word capability. The rout=
es received by PE2 and PE3 are the same.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">If &nbsp;PE2 do not support t=
he control word, it will not carry the control word when forwarding packet=
s to PE1.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">PE1 cannot find the control w=
ord indication label when parsing the PE2 packet. PE1 will treat the packe=
t as normal.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">If &nbsp;PE3 support the cont=
rol word, it can add a control word when forwarding the packet to the PE1,=
 and add the control word indication label specified by
 the PE1. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">When the PE1 receives the pac=
ket and finds the control word indication label in the packet. PE1 will co=
rrectly process the control word.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Thanks<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Haibo<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"ZH-CN" style=3D"font-family:&quot;=
Microsoft YaHei&quot;,sans-serif">=B7=A2=BC=FE=C8=CB</span></b><b><span st=
yle=3D"font-family:&quot;Microsoft YaHei&quot;,sans-serif">:</span></b><sp=
an style=3D"font-family:&quot;Microsoft YaHei&quot;,sans-serif"> Alexander=
 Vainshtein [<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">mailto:Al=
exander.Vainshtein@ecitele.com</a>]
<br>
<b><span lang=3D"ZH-CN">=B7=A2=CB=CD=CA=B1=BC=E4</span>:</b> 2018<span lan=
g=3D"ZH-CN">=C4=EA</span>10<span lang=3D"ZH-CN">=D4=C2</span>23<span lang=3D=
"ZH-CN">=C8=D5</span> 16:46<br>
<b><span lang=3D"ZH-CN">=CA=D5=BC=FE=C8=CB</span>:</b> <a href=3D"mailto:d=
raft-wang-bess-evpn-control-word.authors@ietf.org">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b><span lang=3D"ZH-CN">=B3=AD=CB=CD</span>:</b> <a href=3D"mailto:bess@ie=
tf.org">bess@ietf.org</a><br>
<b><span lang=3D"ZH-CN">=D6=F7=CC=E2</span>:</b> A question regarding draf=
t-wang-bess-evepn-control-word<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Dear authors of <a href=3D"https://tools.ietf.org/h=
tml/draft-wang-bess-evpn-control-word-00">
draft-wang-bess-evpn-control-word</a>,<o:p></o:p></p>
<p class=3D"MsoNormal">I have doubts regarding at least one of the approac=
hes for negotiating the CW usage in the EVPN encapsulation between egress =
and ingress PE that is defined in the draft.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">In the case when the egress PE can receive EVPN-enc=
apsulated packets both with and without CW, the draft seems to propose (as=
 one of the possibilities) advertisement of two EVPN routes for each ES or=
 MAC/IP pair:<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l3 lev=
el1 lfo6"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span styl=
e=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]><span dir=3D"LTR"></span>One of these routes would=
 use the CW Capability to indicate that it refers to the EVPN encapsulatio=
n that uses the CW, and would carry the appropriate label in its NLRI<o:p>=
</o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l3 lev=
el1 lfo6"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span styl=
e=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]><span dir=3D"LTR"></span>The other route would not=
 use the CW Capability to indicate that it refers to the EVPN encapsulatio=
n that does not use the CW, and carry a different label in its NLRI<o:p></=
o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The ingress PE that accepts these routes would then=
 use one of them based on its own ability to use the CW (or lack thereof),=
 and use the corresponding label it its EVPN encapsulation, while &nbsp;th=
e DP in the egress PW would infer presence
 or absence of the CW from the received EVPN application label.<o:p></o:p>=
</p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Unfortunately, I do not think that this can work be=
cause, as per
<a href=3D"https://tools.ietf.org/html/rfc7432">RFC 7432</a>, labels in th=
e labeled NLRI of EVPN routes are not part of the route key for the purpos=
e of the BGP route key processing, while the label is treated just as the =
BGP attribute. This means that, unless
 some form of BGP multi-path is enabled in the ingress PE (and in all RRs =
on the way between the egress PE and ingress PE) for the L2VPN/EVPN &nbsp;=
AFI/SAFI, only one of these routes will be selected by the BGP selection p=
rocess.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Did I miss something substantial here?<o:p></o:p></=
p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p><=
/p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Office: &#43;972-39266302<o:p></o:p></p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266=
302<o:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; <a href=3D"mailto:Alexander.Vain=
shtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;T=
imes New Roman&quot;,serif"><br>
__________________________________________________________________________=
_<br>
<br>
This e-mail message is intended for the recipient only and contains inform=
ation which is
<br>
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece=
ived this
<br>
transmission in error, please inform us by e-mail, phone or fax, and then =
delete the original
<br>
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__________________________________________________________________________=
_<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:SimSun"=
><br>
__________________________________________________________________________=
_<br>
<br>
This e-mail message is intended for the recipient only and contains inform=
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<br>
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ived this
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><br>
__________________________________________________________________________=
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This e-mail message is intended for the recipient only and contains inform=
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CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have rece=
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__________________________________________________________________________=
_<BR>
<BR>
This e-mail message is intended for the recipient only and contains inform=
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From: "Wanghaibo (Rainsword)" <rainsword.wang@huawei.com>
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>, "Yutianpeng (Tim)" <yutianpeng@huawei.com>
CC: "draft-wang-bess-evpn-control-word.authors@ietf.org" <draft-wang-bess-evpn-control-word.authors@ietf.org>, "bess@ietf.org" <bess@ietf.org>
Thread-Topic: A question regarding draft-wang-bess-evepn-control-word
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Date: Wed, 24 Oct 2018 09:43:05 +0000
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Subject: Re: [bess] A question regarding draft-wang-bess-evepn-control-word
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</head>
<body lang=3D"ZH-CN" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Dear Sa=
sha,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Thanks =
for your advice.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Your un=
derstanding is correct.</span><span lang=3D"EN-US">
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Regardi=
ng your question, I don't think that all BUM traffic does not need a contro=
l word.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">First o=
f all, for broadcast traffic, there is really no need for a control word.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Secondl=
y, for unknown unicast traffic, perhaps there is no problem with the contro=
l word, but the message may also be out of order due to load sharing.
 Finally, it is necessary for multicast traffic, otherwise it may also caus=
e out-of-order problems due to load sharing.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Regards=
,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Haibo<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Alexander Vainshtein [mailto:Alexander.Vainshtein@ecitele.com]
<br>
<b>Sent:</b> Wednesday, October 24, 2018 4:39 PM<br>
<b>To:</b> Yutianpeng (Tim) &lt;yutianpeng@huawei.com&gt;<br>
<b>Cc:</b> draft-wang-bess-evpn-control-word.authors@ietf.org; bess@ietf.or=
g; Wanghaibo (Rainsword) &lt;rainsword.wang@huawei.com&gt;<br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-word=
<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Tim,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Lots of thanks for sharing your views.<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Unfortunately, I doubt the approach that you propose: a=
lways use or do not use CW in the same EVI.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">The problem, as I see it is that known unicast and BUM =
traffic may be handled differently when it comes to EVPN encapsulation:<o:p=
></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l2 leve=
l1 lfo2"><![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;m=
so-fareast-language:EN-US"><span style=3D"mso-list:Ignore">1.<span style=3D=
"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;=
mso-fareast-language:EN-US">Section 18 of RFC 7432 explicitly states that =
=A1=B0When sending EVPN-encapsulated packets over a P2MP LSP or P2P LSP, th=
en the control word SHOULD NOT be used=A1=B1<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l2 level2 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fareas=
t-language:EN-US"><span style=3D"mso-list:Ignore">a.<span style=3D"font:7.0=
pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;=
mso-fareast-language:EN-US">This recommendation is quite reasonable because=
 the LSPs in question are not affected by ECMP, so there is no need to use =
the CW to prevent ECMP-cause reordering<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l2 level2 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fareas=
t-language:EN-US"><span style=3D"mso-list:Ignore">b.<span style=3D"font:7.0=
pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;=
mso-fareast-language:EN-US">It is quite possible to P2MP LSPs as the P-tunn=
eling technology delivery of BUM traffic in EVPN while using MP2P LSPs for =
carrying known unicast traffic<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l2 level2 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fareas=
t-language:EN-US"><span style=3D"mso-list:Ignore">c.<span style=3D"font:7.0=
pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><b><span lang=3D"EN-US" style=3D"color:#1F49=
7D;mso-fareast-language:EN-US">The bottom line</span></b><span lang=3D"EN-U=
S" style=3D"color:#1F497D;mso-fareast-language:EN-US">: RFC 7432 defines th=
e &nbsp;scenario when the CW SHOULD be used in
 the EVPN encapsulation of the known unicast traffic but SHOULD NOT be used=
 in the EVPN encapsulation of BUM traffic as valid<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l2 leve=
l1 lfo2"><![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;m=
so-fareast-language:EN-US"><span style=3D"mso-list:Ignore">2.<span style=3D=
"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;=
mso-fareast-language:EN-US">I am aware (this information is publicly availa=
ble) of at least one deployed EVPN implementation that:<o:p></o:p></span></=
p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l2 level2 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fareas=
t-language:EN-US"><span style=3D"mso-list:Ignore">a.<span style=3D"font:7.0=
pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;=
mso-fareast-language:EN-US">By default includes the CW in the EVPN encapsul=
ation of known unicast traffic (this default behavior can be disabled by ex=
plicit configuration)<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l2 level2 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fareas=
t-language:EN-US"><span style=3D"mso-list:Ignore">b.<span style=3D"font:7.0=
pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;=
mso-fareast-language:EN-US">Does not include the CW in the EVPN encapsulati=
on of BUM traffic, presumably due to limitations imposed by the forwarding =
HW.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l2 level2 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fareas=
t-language:EN-US"><span style=3D"mso-list:Ignore">c.<span style=3D"font:7.0=
pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><b><span lang=3D"EN-US" style=3D"color:#1F49=
7D;mso-fareast-language:EN-US">The bottom line</span></b><span lang=3D"EN-U=
S" style=3D"color:#1F497D;mso-fareast-language:EN-US">: inconsistent usage =
of CW in the EVPN encapsulation within the
 same EVI (with differences between known unicast and BUM traffic) is alrea=
dy a fact on the ground (at least, to some extent).<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">My 2c,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ec=
itele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Yutianpeng (Tim) [<a href=3D"mailto:yutianpeng@huawei.com">mail=
to:yutianpeng@huawei.com</a>]
<br>
<b>Sent:</b> Tuesday, October 23, 2018 5:48 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein@=
ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;; Wanghaibo (Rainsword=
) &lt;<a href=3D"mailto:rainsword.wang@huawei.com">rainsword.wang@huawei.co=
m</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@ietf=
.org">draft-wang-bess-evpn-control-word.authors@ietf.org</a>;
<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a><br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-word=
<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Hi Sash=
a,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">I am al=
so thinking of this recently but haven=A1=AFt talked with author yet.<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">What wa=
s in my mind the solution is actually simple: directly tear down (part of) =
the mac-VRF or EVI directly if CW capabilities not consistent, considering =
behavior in one EVI should keep consistent
 (personally believe). &nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">I might=
 tend to the mechanism as below:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">If rout=
er A has CW capabilities and receive type 1 or type 2 routes without CW, th=
en A should drop these routes and report an alarm.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">If rout=
er A does not has CW capabilities and receive type 1 or type 2 routes with =
CW, then A should drop these routes and report an alarm.<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">I belie=
ve the behavior within EVI or Mac-VRF should keep consistent, otherwise, mo=
re questions will pop out.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Conside=
ring if a service is sensitive to packet misordering and it is ELAN, I tend=
 to keep behavior within this ELAN consistent.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">There c=
ould also be other problems with this approach, just share an idea so far o=
pen the discussion.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Regards, and lots of thanks in advance,<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Tim<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> BESS [<a href=3D"mailto:bess-bounces@ietf.org">mailto:bess-boun=
ces@ietf.org</a>]
<b>On Behalf Of </b>Alexander Vainshtein<br>
<b>Sent:</b> 23 October 2018 14:42<br>
<b>To:</b> Wanghaibo (Rainsword) &lt;<a href=3D"mailto:rainsword.wang@huawe=
i.com">rainsword.wang@huawei.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@ietf=
.org">draft-wang-bess-evpn-control-word.authors@ietf.org</a>;
<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a><br>
<b>Subject:</b> Re: [bess] A question regarding draft-wang-bess-evepn-contr=
ol-word<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Dear Haibo,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Again,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Lots of thanks for a prompt response.<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">My reading of your response is as following:<o:p></o:p>=
</span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo4"><![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;m=
so-fareast-language:EN-US"><span style=3D"mso-list:Ignore">1.<span style=3D=
"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;=
mso-fareast-language:EN-US">All egress PEs can receive EVPN-encapsulated pa=
ckets
<b><i>without the CW</i></b><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo4"><![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;m=
so-fareast-language:EN-US"><span style=3D"mso-list:Ignore">2.<span style=3D=
"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;=
mso-fareast-language:EN-US">All ingress PEs can sent EVPN-encapsulated pack=
ets
<b><i>without the CW</i></b><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo4"><![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;m=
so-fareast-language:EN-US"><span style=3D"mso-list:Ignore">3.<span style=3D=
"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;=
mso-fareast-language:EN-US">An egress PE that can receive EVPN-encapsulated=
 packets with the CW in the EVPN encapsulation, &nbsp;must add the appropri=
ate NH Capability attribute that indicates
 the CW-indicating label value (explicitly or implicitly) to all relevant E=
VPN routes. &nbsp;This includes:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l0 level2 lfo4">
<![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fareas=
t-language:EN-US"><span style=3D"mso-list:Ignore">a.<span style=3D"font:7.0=
pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;=
mso-fareast-language:EN-US">Per-EVI Ethernet A-D route (EVPN Route Type 1).=
 In this case the CWI label would follow the label advertised in the NLRI o=
f this route<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l0 level2 lfo4">
<![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fareas=
t-language:EN-US"><span style=3D"mso-list:Ignore">b.<span style=3D"font:7.0=
pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;=
mso-fareast-language:EN-US">MAC/IP Advertisement route (EVPN Type 2 route).=
 In this case the CWI label would follow the label advertised in the NLRI a=
s Label1, it would not be relevant for
 packets that are encapsulated using Label2 (used with the Symmetric EVPN I=
RB).<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo4"><![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;m=
so-fareast-language:EN-US"><span style=3D"mso-list:Ignore">4.<span style=3D=
"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;=
mso-fareast-language:EN-US">An ingress PE that has received an EVPN route w=
ith the CW capability attribute wand that can support usage of CW in the EV=
PN encapsulation, will insert both the
 CWI advertised in the CW capability attribute, and the CW in the EVPN pack=
ets it sends to the corresponding egress PE.&nbsp; If it does not support u=
sage of CW in the encapsulation, it will not insert this label.<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Is this understanding correct?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">If yes, I still have a couple of questions:<o:p></o:p><=
/span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.7pt;text-indent:-18.0=
pt;mso-list:l1 level1 lfo6">
<![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fareas=
t-language:EN-US"><span style=3D"mso-list:Ignore">1.<span style=3D"font:7.0=
pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;=
mso-fareast-language:EN-US">Suppose that you use ingress replication (IR) t=
o deliver BUM traffic across EVPN. The Ingress Replication label would be a=
dvertised in the PTA attribute of the
 Inclusive Multicast Ethernet Tag Route (EVPN Type 3 route); it will not be=
 part of the NLRI. Do you expect the same logic to be used with regard to C=
W capabilities and CWI label advertisement applied also to these routes?<o:=
p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.7pt;text-indent:-18.0=
pt;mso-list:l1 level1 lfo6">
<![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fareas=
t-language:EN-US"><span style=3D"mso-list:Ignore">2.<span style=3D"font:7.0=
pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;=
mso-fareast-language:EN-US">Per-ES Ethernet A-D Routes are advertised with =
the ECI expended Community that carries within the so-called ESI label. Thi=
s label is included the EVPN encapsulation
 of BUM packets sent to the PE that is attached to the same multi-homed ES =
from which the original ES packet has been received. Do you expect the same=
 logic to be used with regard to CW capabilities and CWI label advertisemen=
t applied also to these routes with
 the CWI label following the ESI label in the EVPN encapsulation of BUM pac=
kets?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Regards, and lots of thanks in advance,<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ec=
itele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Wanghaibo (Rainsword) [<a href=3D"mailto:rainsword.wang@huawei.=
com">mailto:rainsword.wang@huawei.com</a>]
<br>
<b>Sent:</b> Tuesday, October 23, 2018 2:34 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein@=
ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; <a href=3D"m=
ailto:draft-wang-bess-evpn-control-word.authors@ietf.org">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-word=
<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Hi Alex=
ander,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The sol=
ution here is to carry the next hop capability attribute when the route is =
advertised. The capability carried here is the control word capability.<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The spe=
cific format of the next hop capability can be referred to the draft.:
<b>&lt;draft-ietf-idr-next-hop-capability&gt;<o:p></o:p></b></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | Capability Code (2 octets)&nbsp;&nbsp; |<o=
:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | Capability Length (2 octets) |<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | Capability Value (variable)&nbsp; |<o:p></=
o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ~&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ~<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">For the=
 control word capability , it may encode as :<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | CW Capabality Type (TBD)&nbsp; &nbsp;&nbsp=
;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | CW Length (0 or 3) &nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | CWI Label (may not exist) &nbsp;&nbsp;&nbs=
p;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">CWI (Co=
ntrol word indication)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">And the=
 forwarding Packet example.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#43;------------------------------&#43=
;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | Tunnel Label &nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></=
o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | EVI Label&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | CW Indicate Label &nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | Control word&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></=
o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The dif=
ference between the two methods is that which value should be use for the c=
ontrol word capability indicates label.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Method =
1, use reserved label, which should be assigned by IANA, (such as the entro=
py label, which is the value of 7)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">If we u=
se this method, then the control word capability attribute</span><span styl=
e=3D"font-size:10.5pt;font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans=
-serif;color:black">=A1=AF<span lang=3D"EN-US">s
 CW length use 0 is enough.<o:p></o:p></span></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">And the=
 forwarding packet use the IANA specified value as the CWI (Control word in=
dication) Label .(Perhaps 8 or others)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Method2=
, use normal value, which is assigned by router.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">If we u=
se this method, then the router must assign a label used for the CWI. Perha=
ps label. And the control word capability attribute</span><span style=3D"fo=
nt-size:10.5pt;font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;=
color:black">=A1=AF<span lang=3D"EN-US">s
 CW length must be 3 and must contain the value in the update message.<o:p>=
</o:p></span></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The for=
warding packet must use that value as the CWI label.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Regards=
,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Haibo<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Alexander Vainshtein [<a href=3D"mailto:Alexander.Vainshtein@ec=
itele.com">mailto:Alexander.Vainshtein@ecitele.com</a>]
<br>
<b>Sent:</b> Tuesday, October 23, 2018 6:09 PM<br>
<b>To:</b> Wanghaibo (Rainsword) &lt;<a href=3D"mailto:rainsword.wang@huawe=
i.com">rainsword.wang@huawei.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; <a href=3D"m=
ailto:draft-wang-bess-evpn-control-word.authors@ietf.org">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-word=
<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Dear Haibo,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Lots of thanks for an extra-prompt response to my quest=
ion.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">There may be some misunderstanding here.<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">The draft says (the important text is highlighted):<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;There are
<span style=3D"background:yellow;mso-highlight:yellow">two methods</span> t=
o specified the control word indicator label:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The first method is to apply=
 for a reserved label to indicate<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;whether the packet contains =
a control word;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The second method is to
<span style=3D"background:yellow;mso-highlight:yellow">apply for a new labe=
l</span> when the sending<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; router advertises the contro=
l word capability,
<span style=3D"background:yellow;mso-highlight:yellow">which is used to<o:p=
></o:p></span></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;background:y=
ellow;mso-highlight:yellow;mso-fareast-language:EN-US">&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; indicate whether the control word is included in the packet</spa=
n><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Courier New=
&quot;;mso-fareast-language:EN-US">.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">My question referred just to the 2<sup>nd</sup> method,=
 while your response seems to deal with the 1<sup>st</sup> one.<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Did I miss something?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ec=
itele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> BESS [<a href=3D"mailto:bess-bounces@ietf.org">mailto:bess-boun=
ces@ietf.org</a>]
<b>On Behalf Of </b>Wanghaibo (Rainsword)<br>
<b>Sent:</b> Tuesday, October 23, 2018 12:03 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein@=
ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;;
<a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@ietf.org">draft=
-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a><br>
<b>Subject:</b> [bess] </span><span style=3D"font-family:=CB=CE=CC=E5">=B4=
=F0=B8=B4</span><span lang=3D"EN-US">: A question regarding draft-wang-bess=
-evepn-control-word<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Hi Alex=
ander,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The num=
ber of routes advertised by the Sender router in our solution will not chan=
ge, but only carries a next hop capability attribute with control word
 capability<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The Rec=
eiver router determines whether to carry the control word when forwarding p=
ackets according to its own capabilities.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The fol=
lowing figure is an example.:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">PE1----=
------PE2<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:10.5pt"><span lang=3D"EN-US" st=
yle=3D"font-size:10.5pt;font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sa=
ns-serif;color:black">|-----------PE3<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">When PE=
1 advertises a route, it carries the next hop attribute of the control word=
 capability. The routes received by PE2 and PE3 are the same.<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">If &nbs=
p;PE2 do not support the control word, it will not carry the control word w=
hen forwarding packets to PE1.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">PE1 can=
not find the control word indication label when parsing the PE2 packet. PE1=
 will treat the packet as normal.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">If &nbs=
p;PE3 support the control word, it can add a control word when forwarding t=
he packet to the PE1, and add the control word indication label specified
 by the PE1. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">When th=
e PE1 receives the packet and finds the control word indication label in th=
e packet. PE1 will correctly process the control word.<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Thanks<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Haibo<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=
=C5=BA=DA&quot;,sans-serif">=B7=A2=BC=FE=C8=CB<span lang=3D"EN-US">:</span>=
</span></b><span lang=3D"EN-US" style=3D"font-family:&quot;=CE=A2=C8=ED=D1=
=C5=BA=DA&quot;,sans-serif"> Alexander Vainshtein [<a href=3D"mailto:Alexan=
der.Vainshtein@ecitele.com">mailto:Alexander.Vainshtein@ecitele.com</a>]
<br>
</span><b><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,s=
ans-serif">=B7=A2=CB=CD=CA=B1=BC=E4<span lang=3D"EN-US">:</span></span></b>=
<span lang=3D"EN-US" style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&qu=
ot;,sans-serif"> 2018</span><span style=3D"font-family:&quot;=CE=A2=C8=ED=
=D1=C5=BA=DA&quot;,sans-serif">=C4=EA<span lang=3D"EN-US">10</span>=D4=C2<s=
pan lang=3D"EN-US">23</span>=C8=D5<span lang=3D"EN-US">
 16:46<br>
</span><b>=CA=D5=BC=FE=C8=CB<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> <a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@ietf.or=
g">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
</span><b>=B3=AD=CB=CD<span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"=
> <a href=3D"mailto:bess@ietf.org">
bess@ietf.org</a><br>
</span><b>=D6=F7=CC=E2<span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"=
> A question regarding draft-wang-bess-evepn-control-word<o:p></o:p></span>=
</span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Dear authors of <a href=3D"http=
s://tools.ietf.org/html/draft-wang-bess-evpn-control-word-00">
draft-wang-bess-evpn-control-word</a>,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I have doubts regarding at leas=
t one of the approaches for negotiating the CW usage in the EVPN encapsulat=
ion between egress and ingress PE that is defined in the draft.<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">In the case when the egress PE =
can receive EVPN-encapsulated packets both with and without CW, the draft s=
eems to propose (as one of the possibilities) advertisement of two EVPN rou=
tes for each ES or MAC/IP pair:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l3 leve=
l1 lfo8"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">One of these routes wou=
ld use the CW Capability to indicate that it refers to the EVPN encapsulati=
on that uses the CW, and would carry the appropriate label in its NLRI<o:p>=
</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l3 leve=
l1 lfo8"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">The other route would n=
ot use the CW Capability to indicate that it refers to the EVPN encapsulati=
on that does not use the CW, and carry a different label in its NLRI<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The ingress PE that accepts the=
se routes would then use one of them based on its own ability to use the CW=
 (or lack thereof), and use the corresponding label it its EVPN encapsulati=
on, while &nbsp;the DP in the egress PW would
 infer presence or absence of the CW from the received EVPN application lab=
el.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Unfortunately, I do not think t=
hat this can work because, as per
<a href=3D"https://tools.ietf.org/html/rfc7432">RFC 7432</a>, labels in the=
 labeled NLRI of EVPN routes are not part of the route key for the purpose =
of the BGP route key processing, while the label is treated just as the BGP=
 attribute. This means that, unless
 some form of BGP multi-path is enabled in the ingress PE (and in all RRs o=
n the way between the egress PE and ingress PE) for the L2VPN/EVPN &nbsp;AF=
I/SAFI, only one of these routes will be selected by the BGP selection proc=
ess.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Did I miss something substantia=
l here?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Regards, and lots of thanks in =
advance,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Office: &#43;972-39266302<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp; &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Email:&nbsp;&nbsp; <a href=3D"m=
ailto:Alexander.Vainshtein@ecitele.com">
Alexander.Vainshtein@ecitele.com</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;Times New Roman&quot;,serif"><br>
___________________________________________________________________________=
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To: "stephane.litkowski@orange.com" <stephane.litkowski@orange.com>, "draft-ietf-bess-evpn-yang@ietf.org" <draft-ietf-bess-evpn-yang@ietf.org>, "draft-ietf-bess-l2vpn-yang@ietf.org" <draft-ietf-bess-l2vpn-yang@ietf.org>, "draft-ietf-bess-l3vpn-yang@ietf.org" <draft-ietf-bess-l3vpn-yang@ietf.org>
CC: "bess@ietf.org" <bess@ietf.org>
Thread-Topic: LxVPN and EVPN yang models
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Date: Wed, 24 Oct 2018 10:50:52 +0000
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Subject: Re: [bess] LxVPN and EVPN yang models
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Hi Stephane,
These comments truly make sense. There should be more synchronization and c=
onsistency between these Yang models. And during the course of design of di=
fferent Yang models,
Patrice and other team members proposed to define the common VPN Yang compo=
nents shared between different Yang models as an independent draft. We will=
 try to
synchronize the LxVPN and EVPN yang models and work out how to abstract the=
 common modules reused across all models.


Best Regards,
Robin


From: stephane.litkowski@orange.com [mailto:stephane.litkowski@orange.com]
Sent: Monday, October 22, 2018 8:29 PM
To: draft-ietf-bess-evpn-yang@ietf.org; draft-ietf-bess-l2vpn-yang@ietf.org=
; draft-ietf-bess-l3vpn-yang@ietf.org
Cc: bess@ietf.org
Subject: LxVPN and EVPN yang models

Hi Authors,


Speaking as individual, after reading the last versions of your module, I s=
till have several concerns about the consistency of the modeling across all=
 models.
There are common components between all the models that could be shared or =
at least modeled in the same way:

-          Model name: L3VPN uses ietf-bgp-l3vpn while others use ietf-evpn=
 or ietf-l2vpn

-          Route-target import/export and route-distinguisher:

o   Under bgp-parameters/common/rd-rt/ for EVPN

o   Under bgp-auto-discovery for L2VPN (that could make sense here but it i=
s weird in term of config consistency =3D> maybe better to have a bgp-auto-=
discovery Boolean or maybe the discovery-type is enough to know that bgp-au=
to-discovery is used ?)

o   Under ipv4 or ipv6 for l3vpn RTs but rd is at top level. That could mak=
e sense but again the configuration is slightly different from other AFI/SA=
FIs. Having different imp/exp for IPv4 and IPv6 is a valid use case, but yo=
u should also allow to have the same config for both without defining per A=
FI/SAFI config.

-          RIB route limits could also be modeled the same way

-          Modelization of route entries in the RIB could be modeled in the=
 same way across model

-          Attachment to the NI:

o   I don't understand how EVPN is integrated in L2VPN. It seems that you a=
dd a pointer (reference) to an EVPN instance which is in a completely diffe=
rent tree. That looks really strange and make EVPN instance configuration c=
ompletely different from an L3VPN instance or L2VPN instance. Do you plan t=
o reuse the config parameters from L2VPN or do you prefer creating a comple=
tely different tree ? If you prefer a completely different tree why not cre=
ating an EVPN ni-type ?


Can't we have one model defining some bgp-vpn containers possibly as a sepa=
rate module that could be reused across all models ?

Happy to hear your feedback.

Brgds,

Stephane


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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Hi Stephane,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">These comments truly make sense. There should be more synchroniza=
tion and consistency between these Yang models. And during the course of de=
sign of different Yang models,
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Patrice and other team members proposed to define the common VPN =
Yang components shared between different Yang models as an independent draf=
t. We will try to
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">synchronize the LxVPN and EVPN yang models and work out how to ab=
stract the common modules reused across all models.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Best Regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Robin<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> stephane.litkowski@orange.com [mailto:stephane.litkowski@orange=
.com]
<br>
<b>Sent:</b> Monday, October 22, 2018 8:29 PM<br>
<b>To:</b> draft-ietf-bess-evpn-yang@ietf.org; draft-ietf-bess-l2vpn-yang@i=
etf.org; draft-ietf-bess-l3vpn-yang@ietf.org<br>
<b>Cc:</b> bess@ietf.org<br>
<b>Subject:</b> LxVPN and EVPN yang models<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Hi Authors,<o:p></o:p></span></=
p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Speaking as individual, after r=
eading the last versions of your module, I still have several concerns abou=
t the consistency of the modeling across all models.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">There are common components bet=
ween all the models that could be shared or at least modeled in the same wa=
y:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo2"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Model name: L3VPN uses =
ietf-bgp-l3vpn while others use ietf-evpn or ietf-l2vpn<o:p></o:p></span></=
p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo2"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Route-target import/exp=
ort and route-distinguisher:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l0 level2 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:&quot;Courie=
r New&quot;"><span style=3D"mso-list:Ignore">o<span style=3D"font:7.0pt &qu=
ot;Times New Roman&quot;">&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Under bgp-parameters/co=
mmon/rd-rt/ for EVPN<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l0 level2 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:&quot;Courie=
r New&quot;"><span style=3D"mso-list:Ignore">o<span style=3D"font:7.0pt &qu=
ot;Times New Roman&quot;">&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Under bgp-auto-discover=
y for L2VPN (that could make sense here but it is weird in term of config c=
onsistency =3D&gt; maybe better to have a bgp-auto-discovery Boolean or may=
be the discovery-type is enough to know
 that bgp-auto-discovery is used ?)<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l0 level2 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:&quot;Courie=
r New&quot;"><span style=3D"mso-list:Ignore">o<span style=3D"font:7.0pt &qu=
ot;Times New Roman&quot;">&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Under ipv4 or ipv6 for =
l3vpn RTs but rd is at top level. That could make sense but again the confi=
guration is slightly different from other AFI/SAFIs. Having different imp/e=
xp for IPv4 and IPv6 is a valid use
 case, but you should also allow to have the same config for both without d=
efining per AFI/SAFI config.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo2"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">RIB route limits could =
also be modeled the same way
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo2"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Modelization of route e=
ntries in the RIB could be modeled in the same way across model
<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo2"><![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:=
Ignore">-<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">Attachment to the NI:<o=
:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l0 level2 lfo2">
<![if !supportLists]><span lang=3D"EN-US" style=3D"font-family:&quot;Courie=
r New&quot;"><span style=3D"mso-list:Ignore">o<span style=3D"font:7.0pt &qu=
ot;Times New Roman&quot;">&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">I don&#8217;t understan=
d how EVPN is integrated in L2VPN. It seems that you add a pointer (referen=
ce) to an EVPN instance which is in a completely different tree. That looks=
 really strange and make EVPN instance configuration
 completely different from an L3VPN instance or L2VPN instance. Do you plan=
 to reuse the config parameters from L2VPN or do you prefer creating a comp=
letely different tree ? If you prefer a completely different tree why not c=
reating an EVPN ni-type ?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Can&#8217;t we have one model d=
efining some bgp-vpn containers possibly as a separate module that could be=
 reused across all models ?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Happy to hear your feedback.<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Brgds,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
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style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&quot;,serif"><o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<pre><span lang=3D"EN-US">_________________________________________________=
________________________________________________________________________<o:=
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Mirja Kühlewind has entered the following ballot position for
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----------------------------------------------------------------------
DISCUSS:
----------------------------------------------------------------------

In section 9 (security considerations):
Thanks for discussing network load here! However, I find this sentence a bit
unsatisfactory:
   „The specification of counter-measures for this problem is outside the scope
   of this document.“
Isn’t there any easy way to make some more recommendations for counter measures
that could be discussed here? E.g. implement some rate limiting or filtering.
Or only accept LIR-PF request from preconfigured hosts (given that LIR-PF
support must anyway be pre-configured)? I’m not an expert on this topic and
therefore don’t know if any of such recommendations make sense, however, I
would quickly like to discuss if it is potentially possible to say more than
what’s current said. Thanks!


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

Some other minor comments:
 1) section 2: „Use of this flag in the PTA carried by other route types is outside
   the scope of this document.  Use of this flag in the PTA carried by
   an S-PMSI A-D routes whose NLRI does not contain a wildcard is
   outside the scope of this document.“
Maybe you also want to say something like „The flag SHOULD be ignored in these cases.“..?

 2) section 3
s/The result (if any) is the match for tracking“/The result (if any) is the “match for tracking“/
(missing quotes)



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</head>
<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi Sasha,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Thanks a lot for your =
advice.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I agree with you that =
CW is not mandatory for all traffic, mainly unicast. This draft focuses on =
CW capability advertisement and is applicable to traffic needs CW processin=
g. &nbsp;So far BUM should be not relevant
 to this draft. (Multicast might need CW potentially we realize recently, b=
ut we will visit this topic later.)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Some clarification on =
my proposal:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I believe we need a me=
chanism of negotiation on CW capabilities in EVPN ELAN. If you check PW or =
EVPN VPWS there is a clear procedure on negotiation between two ends.<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Refer to: <a href=3D"h=
ttps://tools.ietf.org/html/rfc4447#section-6">
<span style=3D"color:#1F497D;text-decoration:none">https://tools.ietf.org/h=
tml/rfc4447#section-6</span></a> and
<a name=3D"appendix-A"></a><a href=3D"https://tools.ietf.org/html/rfc4447#a=
ppendix-A"><span style=3D"color:#1F497D;text-decoration:none">Appendix A</s=
pan></a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">But as EVPN is MP2MP, =
in case of PE CW behavior can be different between PEs as there is no negot=
iation at all at the moment.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">So this draft introduc=
es CW capability which at least allows PEs within EVI knows the capability =
of each other. It also defines behavior after receiving CW capabilities.<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">What I proposed is the=
 behavior in case CW capabilities across PEs are different. I mentioned a s=
imple way of tearing down or isolate CW disabled PEs and raise an alarm, a =
bit similar to PW. The draft proposes
 a graceful way that traffic can be forwarded with a label advertised toget=
her with CW capability, such that egress PE can indicate CW via the label o=
n the forwarding plane.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Happy for further disc=
ussion on this as CW of EVPN topic has been raised couple of times recently=
.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Thanks &amp; Regards,<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Tim<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein [mailto:Alexander.=
Vainshtein@ecitele.com]
<br>
<b>Sent:</b> 24 October 2018 09:39<br>
<b>To:</b> Yutianpeng (Tim) &lt;yutianpeng@huawei.com&gt;<br>
<b>Cc:</b> draft-wang-bess-evpn-control-word.authors@ietf.org; bess@ietf.or=
g; Wanghaibo (Rainsword) &lt;rainsword.wang@huawei.com&gt;<br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-word=
<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Tim,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Lots of thanks for sharing your views.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Unfortunately, I doubt the approach that you propose: always use or do=
 not use CW in the same EVI.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">The problem, as I see it is that known unicast and BUM traffic may be =
handled differently when it comes to EVPN encapsulation:<o:p></o:p></span><=
/p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l2 leve=
l1 lfo2"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-lang=
uage:EN-US"><span style=3D"mso-list:Ignore">1.<span style=3D"font:7.0pt &qu=
ot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">Section 18 of RFC 7432 explicitly states that =A1=B0When sendi=
ng EVPN-encapsulated packets over a P2MP LSP or P2P LSP, then the control w=
ord SHOULD NOT be used=A1=B1<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l2 level2 lfo2">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">a.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">This recommendation is quite reasonable because the LSPs in qu=
estion are not affected by ECMP, so there is no need to use the CW to preve=
nt ECMP-cause reordering<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l2 level2 lfo2">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">b.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">It is quite possible to P2MP LSPs as the P-tunneling technolog=
y delivery of BUM traffic in EVPN while using MP2P LSPs for carrying known =
unicast traffic<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l2 level2 lfo2">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">c.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><b><span style=3D"color:#1F497D;mso-fareast-=
language:EN-US">The bottom line</span></b><span style=3D"color:#1F497D;mso-=
fareast-language:EN-US">: RFC 7432 defines the &nbsp;scenario when the CW S=
HOULD be used in the EVPN encapsulation of
 the known unicast traffic but SHOULD NOT be used in the EVPN encapsulation=
 of BUM traffic as valid<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l2 leve=
l1 lfo2"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-lang=
uage:EN-US"><span style=3D"mso-list:Ignore">2.<span style=3D"font:7.0pt &qu=
ot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">I am aware (this information is publicly available) of at leas=
t one deployed EVPN implementation that:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l2 level2 lfo2">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">a.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">By default includes the CW in the EVPN encapsulation of known =
unicast traffic (this default behavior can be disabled by explicit configur=
ation)<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l2 level2 lfo2">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">b.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">Does not include the CW in the EVPN encapsulation of BUM traff=
ic, presumably due to limitations imposed by the forwarding HW.<o:p></o:p><=
/span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l2 level2 lfo2">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">c.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><b><span style=3D"color:#1F497D;mso-fareast-=
language:EN-US">The bottom line</span></b><span style=3D"color:#1F497D;mso-=
fareast-language:EN-US">: inconsistent usage of CW in the EVPN encapsulatio=
n within the same EVI (with differences
 between known unicast and BUM traffic) is already a fact on the ground (at=
 least, to some extent).<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">My 2c,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ec=
itele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Yutianpeng (Tim) [<a href=3D"mailto:yut=
ianpeng@huawei.com">mailto:yutianpeng@huawei.com</a>]
<br>
<b>Sent:</b> Tuesday, October 23, 2018 5:48 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein@=
ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;; Wanghaibo (Rainsword=
) &lt;<a href=3D"mailto:rainsword.wang@huawei.com">rainsword.wang@huawei.co=
m</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@ietf=
.org">draft-wang-bess-evpn-control-word.authors@ietf.org</a>;
<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a><br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-word=
<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi Sasha,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I am also thinking of =
this recently but haven=A1=AFt talked with author yet.<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">What was in my mind th=
e solution is actually simple: directly tear down (part of) the mac-VRF or =
EVI directly if CW capabilities not consistent, considering behavior in one=
 EVI should keep consistent (personally
 believe). &nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I might tend to the me=
chanism as below:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">If router A has CW cap=
abilities and receive type 1 or type 2 routes without CW, then A should dro=
p these routes and report an alarm.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">If router A does not h=
as CW capabilities and receive type 1 or type 2 routes with CW, then A shou=
ld drop these routes and report an alarm.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I believe the behavior=
 within EVI or Mac-VRF should keep consistent, otherwise, more questions wi=
ll pop out.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Considering if a servi=
ce is sensitive to packet misordering and it is ELAN, I tend to keep behavi=
or within this ELAN consistent.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">There could also be ot=
her problems with this approach, just share an idea so far open the discuss=
ion.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Regards, and lots of thanks in advance,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Tim<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> BESS [<a href=3D"mailto:bess-bounces@ie=
tf.org">mailto:bess-bounces@ietf.org</a>]
<b>On Behalf Of </b>Alexander Vainshtein<br>
<b>Sent:</b> 23 October 2018 14:42<br>
<b>To:</b> Wanghaibo (Rainsword) &lt;<a href=3D"mailto:rainsword.wang@huawe=
i.com">rainsword.wang@huawei.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@ietf=
.org">draft-wang-bess-evpn-control-word.authors@ietf.org</a>;
<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a><br>
<b>Subject:</b> Re: [bess] A question regarding draft-wang-bess-evepn-contr=
ol-word<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Dear Haibo,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Again,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Lots of thanks for a prompt response.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">My reading of your response is as following:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo4"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-lang=
uage:EN-US"><span style=3D"mso-list:Ignore">1.<span style=3D"font:7.0pt &qu=
ot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">All egress PEs can receive EVPN-encapsulated packets
<b><i>without the CW</i></b><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo4"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-lang=
uage:EN-US"><span style=3D"mso-list:Ignore">2.<span style=3D"font:7.0pt &qu=
ot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">All ingress PEs can sent EVPN-encapsulated packets
<b><i>without the CW</i></b><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo4"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-lang=
uage:EN-US"><span style=3D"mso-list:Ignore">3.<span style=3D"font:7.0pt &qu=
ot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">An egress PE that can receive EVPN-encapsulated packets with t=
he CW in the EVPN encapsulation, &nbsp;must add the appropriate NH Capabili=
ty attribute that indicates the CW-indicating
 label value (explicitly or implicitly) to all relevant EVPN routes. &nbsp;=
This includes:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l0 level2 lfo4">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">a.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">Per-EVI Ethernet A-D route (EVPN Route Type 1). In this case t=
he CWI label would follow the label advertised in the NLRI of this route<o:=
p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l0 level2 lfo4">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">b.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">MAC/IP Advertisement route (EVPN Type 2 route). In this case t=
he CWI label would follow the label advertised in the NLRI as Label1, it wo=
uld not be relevant for packets that
 are encapsulated using Label2 (used with the Symmetric EVPN IRB).<o:p></o:=
p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo4"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-lang=
uage:EN-US"><span style=3D"mso-list:Ignore">4.<span style=3D"font:7.0pt &qu=
ot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">An ingress PE that has received an EVPN route with the CW capa=
bility attribute wand that can support usage of CW in the EVPN encapsulatio=
n, will insert both the CWI advertised
 in the CW capability attribute, and the CW in the EVPN packets it sends to=
 the corresponding egress PE.&nbsp; If it does not support usage of CW in t=
he encapsulation, it will not insert this label.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Is this understanding correct?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">If yes, I still have a couple of questions:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.7pt;text-indent:-18.0=
pt;mso-list:l1 level1 lfo6">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">1.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">Suppose that you use ingress replication (IR) to deliver BUM t=
raffic across EVPN. The Ingress Replication label would be advertised in th=
e PTA attribute of the Inclusive Multicast
 Ethernet Tag Route (EVPN Type 3 route); it will not be part of the NLRI. D=
o you expect the same logic to be used with regard to CW capabilities and C=
WI label advertisement applied also to these routes?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.7pt;text-indent:-18.0=
pt;mso-list:l1 level1 lfo6">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">2.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">Per-ES Ethernet A-D Routes are advertised with the ECI expende=
d Community that carries within the so-called ESI label. This label is incl=
uded the EVPN encapsulation of BUM
 packets sent to the PE that is attached to the same multi-homed ES from wh=
ich the original ES packet has been received. Do you expect the same logic =
to be used with regard to CW capabilities and CWI label advertisement appli=
ed also to these routes with the
 CWI label following the ESI label in the EVPN encapsulation of BUM packets=
?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Regards, and lots of thanks in advance,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ec=
itele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Wanghaibo (Rainsword) [<a href=3D"mailt=
o:rainsword.wang@huawei.com">mailto:rainsword.wang@huawei.com</a>]
<br>
<b>Sent:</b> Tuesday, October 23, 2018 2:34 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein@=
ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; <a href=3D"m=
ailto:draft-wang-bess-evpn-control-word.authors@ietf.org">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-word=
<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Hi Alexander,<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The solution here is=
 to carry the next hop capability attribute when the route is advertised. T=
he capability carried here is the control word capability.<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The specific format =
of the next hop capability can be referred to the draft.:
<b>&lt;draft-ietf-idr-next-hop-capability&gt;<o:p></o:p></b></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | Capability Code (2 octets)&nbsp;&nbsp; |<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | Capability Length (2 octets) |<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | Capability Value (variable)&nbsp; |<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; ~&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ~<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">For the control word=
 capability , it may encode as :<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | CW Capabality Type (TBD)&nbsp; &nbsp;&nbsp;&nbsp;|<o:p></=
o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | CW Length (0 or 3) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | CWI Label (may not exist) &nbsp;&nbsp;&nbsp;|<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">CWI (Control word in=
dication)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">And the forwarding P=
acket example.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&#43;------------------------------&#43;<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | Tunnel Label &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | EVI Label&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></=
o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | CW Indicate Label &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | Control word&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The difference betwe=
en the two methods is that which value should be use for the control word c=
apability indicates label.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Method 1, use reserv=
ed label, which should be assigned by IANA, (such as the entropy label, whi=
ch is the value of 7)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">If we use this metho=
d, then the control word capability attribute<span lang=3D"ZH-CN">=A1=AF</s=
pan>s CW length use 0 is enough.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">And the forwarding p=
acket use the IANA specified value as the CWI (Control word indication) Lab=
el .(Perhaps 8 or others)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Method2, use normal =
value, which is assigned by router.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">If we use this metho=
d, then the router must assign a label used for the CWI. Perhaps label. And=
 the control word capability attribute<span lang=3D"ZH-CN">=A1=AF</span>s C=
W
 length must be 3 and must contain the value in the update message.<o:p></o=
:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The forwarding packe=
t must use that value as the CWI label.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Regards,<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Haibo<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein [<a href=3D"mailto=
:Alexander.Vainshtein@ecitele.com">mailto:Alexander.Vainshtein@ecitele.com<=
/a>]
<br>
<b>Sent:</b> Tuesday, October 23, 2018 6:09 PM<br>
<b>To:</b> Wanghaibo (Rainsword) &lt;<a href=3D"mailto:rainsword.wang@huawe=
i.com">rainsword.wang@huawei.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; <a href=3D"m=
ailto:draft-wang-bess-evpn-control-word.authors@ietf.org">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-word=
<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Dear Haibo,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Lots of thanks for an extra-prompt response to my question.<o:p></o:p>=
</span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">There may be some misunderstanding here.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">The draft says (the important text is highlighted):<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;There are
<span style=3D"background:yellow;mso-highlight:yellow">two methods</span> t=
o specified the control word indicator label:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The first method is to apply=
 for a reserved label to indicate<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;whether the packet contains =
a control word;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The second method is to
<span style=3D"background:yellow;mso-highlight:yellow">apply for a new labe=
l</span> when the sending<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; router advertises the contro=
l word capability,
<span style=3D"background:yellow;mso-highlight:yellow">which is used to<o:p=
></o:p></span></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;background:y=
ellow;mso-highlight:yellow;mso-fareast-language:EN-US">&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; indicate whether the control word is included in the packet</spa=
n><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Courier New=
&quot;;mso-fareast-language:EN-US">.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">My question referred just to the 2<sup>nd</sup> method, while your res=
ponse seems to deal with the 1<sup>st</sup> one.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Did I miss something?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ec=
itele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> BESS [<a href=3D"mailto:bess-bounces@ie=
tf.org">mailto:bess-bounces@ietf.org</a>]
<b>On Behalf Of </b>Wanghaibo (Rainsword)<br>
<b>Sent:</b> Tuesday, October 23, 2018 12:03 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein@=
ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;;
<a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@ietf.org">draft=
-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a><br>
<b>Subject:</b> [bess] <span lang=3D"ZH-CN" style=3D"font-family:SimSun">=
=B4=F0=B8=B4</span>: A question regarding draft-wang-bess-evepn-control-wor=
d<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Hi Alexander,<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The number of routes=
 advertised by the Sender router in our solution will not change, but only =
carries a next hop capability attribute with control word capability<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The Receiver router =
determines whether to carry the control word when forwarding packets accord=
ing to its own capabilities.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The following figure=
 is an example.:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">PE1----------PE2<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:10.5pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:=
black">|-----------PE3<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">When PE1 advertises =
a route, it carries the next hop attribute of the control word capability. =
The routes received by PE2 and PE3 are the same.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">If &nbsp;PE2 do not =
support the control word, it will not carry the control word when forwardin=
g packets to PE1.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">PE1 cannot find the =
control word indication label when parsing the PE2 packet. PE1 will treat t=
he packet as normal.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">If &nbsp;PE3 support=
 the control word, it can add a control word when forwarding the packet to =
the PE1, and add the control word indication label specified by the PE1.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">When the PE1 receive=
s the packet and finds the control word indication label in the packet. PE1=
 will correctly process the control word.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Thanks<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Haibo<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"ZH-CN" style=3D"font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif">=B7=A2=BC=FE=C8=CB</span></b><b>=
<span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif"=
>:</span></b><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot=
;,sans-serif"> Alexander Vainshtein [<a href=3D"mailto:Alexander.Vainshtein=
@ecitele.com">mailto:Alexander.Vainshtein@ecitele.com</a>]
<br>
<b><span lang=3D"ZH-CN">=B7=A2=CB=CD=CA=B1=BC=E4</span>:</b> 2018<span lang=
=3D"ZH-CN">=C4=EA</span>10<span lang=3D"ZH-CN">=D4=C2</span>23<span lang=3D=
"ZH-CN">=C8=D5</span> 16:46<br>
<b><span lang=3D"ZH-CN">=CA=D5=BC=FE=C8=CB</span>:</b> <a href=3D"mailto:dr=
aft-wang-bess-evpn-control-word.authors@ietf.org">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b><span lang=3D"ZH-CN">=B3=AD=CB=CD</span>:</b> <a href=3D"mailto:bess@iet=
f.org">bess@ietf.org</a><br>
<b><span lang=3D"ZH-CN">=D6=F7=CC=E2</span>:</b> A question regarding draft=
-wang-bess-evepn-control-word<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Dear authors of <a href=3D"https://tools.ietf.org/ht=
ml/draft-wang-bess-evpn-control-word-00">
draft-wang-bess-evpn-control-word</a>,<o:p></o:p></p>
<p class=3D"MsoNormal">I have doubts regarding at least one of the approach=
es for negotiating the CW usage in the EVPN encapsulation between egress an=
d ingress PE that is defined in the draft.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">In the case when the egress PE can receive EVPN-enca=
psulated packets both with and without CW, the draft seems to propose (as o=
ne of the possibilities) advertisement of two EVPN routes for each ES or MA=
C/IP pair:<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l3 leve=
l1 lfo8"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>One of these routes would use the CW Capability to =
indicate that it refers to the EVPN encapsulation that uses the CW, and wou=
ld carry the appropriate label in its NLRI<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l3 leve=
l1 lfo8"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]>The other route would not use the CW Capability to =
indicate that it refers to the EVPN encapsulation that does not use the CW,=
 and carry a different label in its NLRI<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The ingress PE that accepts these routes would then =
use one of them based on its own ability to use the CW (or lack thereof), a=
nd use the corresponding label it its EVPN encapsulation, while &nbsp;the D=
P in the egress PW would infer presence
 or absence of the CW from the received EVPN application label.<o:p></o:p><=
/p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Unfortunately, I do not think that this can work bec=
ause, as per
<a href=3D"https://tools.ietf.org/html/rfc7432">RFC 7432</a>, labels in the=
 labeled NLRI of EVPN routes are not part of the route key for the purpose =
of the BGP route key processing, while the label is treated just as the BGP=
 attribute. This means that, unless
 some form of BGP multi-path is enabled in the ingress PE (and in all RRs o=
n the way between the egress PE and ingress PE) for the L2VPN/EVPN &nbsp;AF=
I/SAFI, only one of these routes will be selected by the BGP selection proc=
ess.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Did I miss something substantial here?<o:p></o:p></p=
>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p></=
p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Office: &#43;972-39266302<o:p></o:p></p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-5492663=
02<o:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; <a href=3D"mailto:Alexander.Vains=
htein@ecitele.com">Alexander.Vainshtein@ecitele.com</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ti=
mes New Roman&quot;,serif"><br>
___________________________________________________________________________=
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From: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>
To: "Yutianpeng (Tim)" <yutianpeng@huawei.com>
CC: "draft-wang-bess-evpn-control-word.authors@ietf.org" <draft-wang-bess-evpn-control-word.authors@ietf.org>, "bess@ietf.org" <bess@ietf.org>, "Wanghaibo (Rainsword)" <rainsword.wang@huawei.com>
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Subject: Re: [bess] A question regarding draft-wang-bess-evepn-control-word
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</head>
<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Tim,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Lots of thanks for your email, it really clarifies your approach.<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Regarding your proposal to =A1=B0isolate=A1=B1 PEs that do not suppo=
rt the CW - I suspect this is not practical.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">EVPN-MPLS implementations are not REQUIRED to support usage of CW. S=
ome EVPN-MPLS implementations that I am aware of explicitly state that the=
 CW usage can be disabled for interoperability
 with other vendors, so I think that there EVPN implementations that do no=
t support the CW have been deployed.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<pre><span style=3D"color:#1F497D;mso-fareast-language:EN-US"><a href=3D"h=
ttps://tools.ietf.org/html/draft-ietf-pals-ethernet-cw-07">draft-ietf-pals=
-ethernet-cw</a> (already in the RFC Editor queue in the AUTH48 state) say=
s that =A1=B0</span><span style=3D"font-size:10.0pt;font-family:&quot;Cour=
ier New&quot;;color:black;background:yellow;mso-highlight:yellow;mso-farea=
st-language:EN-US">where both the ingress PE and the egress PE support the=
 Ethernet pseudowire control word</span><span style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;;color:black;mso-fareast-language:EN-US">=
, then the CW MUST be used</span><span style=3D"color:#1F497D;mso-fareast-=
language:EN-US">=A1=B1. <o:p></o:p></span></pre>
<pre><span style=3D"color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp;<=
/o:p></span></pre>
<pre><span style=3D"color:#1F497D;mso-fareast-language:EN-US">Personally I=
 think that this sets the goal that we should achieve in EVPN as well:<o:p=
></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-list:l2 level1 lf=
o9"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language=
:EN-US"><span style=3D"mso-list:Ignore">1.<span style=3D"font:7.0pt &quot;=
Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span>=
</span><![endif]><span dir=3D"LTR"></span><span style=3D"color:#1F497D;mso=
-fareast-language:EN-US">All EVPN-MPLS implementations MUST support EVPN e=
ncapsulations without the CW<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-list:l2 level1 lf=
o9"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language=
:EN-US"><span style=3D"mso-list:Ignore">2.<span style=3D"font:7.0pt &quot;=
Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span>=
</span><![endif]><span dir=3D"LTR"></span><span style=3D"color:#1F497D;mso=
-fareast-language:EN-US">An egress PE SHOULD indicate, <span style=3D"back=
ground:yellow;mso-highlight:yellow">per each L2VPN/EVPN route it advertise=
s</span>, whether it can handle received CW in the EVPN encapsulation for =
packets that are sent to it based on this route by ingress PEs, or not, an=
d, if it can, how the presence of the CW is indicated. &nbsp;This can be d=
one using the CW Next-Hop Capability and the CWI label as explained in the=
 draft<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-list:l2 level1 lf=
o9"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language=
:EN-US"><span style=3D"mso-list:Ignore">3.<span style=3D"font:7.0pt &quot;=
Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span>=
</span><![endif]><span dir=3D"LTR"></span><span style=3D"color:#1F497D;mso=
-fareast-language:EN-US">An ingress PE that accepts a L2VPN/EVPN route wit=
h the CW next Hop Capability, MUST insert the CW and indicate its presence=
, <b><i>if it supports CWI and CW insertion in the appropriate EVPN encaps=
ulation</i></b>. Please note that the ability to insert CWI and CW may dif=
fer for different L2VPN/EVPN routes. E.g.. the same PE can:<o:p></o:p></sp=
an></pre>
<pre style=3D"margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level2 lf=
o9"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language=
:EN-US"><span style=3D"mso-list:Ignore">a.<span style=3D"font:7.0pt &quot;=
Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span>=
</span><![endif]><span dir=3D"LTR"></span><span style=3D"color:#1F497D;mso=
-fareast-language:EN-US">Support the CWI and CW insertion in the EVPN enca=
psulation of =A1=B0known unicast=A1=B1 frames and BUM frames if their enca=
psulation does not require insertion of the ESI label<o:p></o:p></span></p=
re>
<pre style=3D"margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level2 lf=
o9"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language=
:EN-US"><span style=3D"mso-list:Ignore">b.<span style=3D"font:7.0pt &quot;=
Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span>=
</span><![endif]><span dir=3D"LTR"></span><span style=3D"color:#1F497D;mso=
-fareast-language:EN-US">Not support CWI and CW insertion in the EVPN enca=
psulation of BUM frames if this inclusion of the ESI label in their encaps=
ulation is required.<o:p></o:p></span></pre>
<pre><span style=3D"color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp;<=
/o:p></span></pre>
<pre><span style=3D"color:#1F497D;mso-fareast-language:EN-US">This approac=
h would &nbsp;meet with the old IETF design principle: =A1=B0Be strict in =
what you transmit and liberal in what you receive=A1=B1.<o:p></o:p></span>=
</pre>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Hope this helps.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">My 2c,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Email:&nbsp;&nbsp; Alexander.Vainshtein@ecitele.com<o:p></o:p></span=
></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Yutianpeng (Tim) [mailto:yutianpeng@hu=
awei.com]
<br>
<b>Sent:</b> Wednesday, October 24, 2018 5:32 PM<br>
<b>To:</b> Alexander Vainshtein &lt;Alexander.Vainshtein@ecitele.com&gt;<b=
r>
<b>Cc:</b> draft-wang-bess-evpn-control-word.authors@ietf.org; bess@ietf.o=
rg; Wanghaibo (Rainsword) &lt;rainsword.wang@huawei.com&gt;<br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-wor=
d<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi Sasha,<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Thanks a lot for your=
 advice.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I agree with you that=
 CW is not mandatory for all traffic, mainly unicast. This draft focuses o=
n CW capability advertisement and is applicable to traffic needs CW proces=
sing. &nbsp;So far BUM should be not relevant
 to this draft. (Multicast might need CW potentially we realize recently, =
but we will visit this topic later.)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Some clarification on=
 my proposal:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I believe we need a m=
echanism of negotiation on CW capabilities in EVPN ELAN. If you check PW o=
r EVPN VPWS there is a clear procedure on negotiation between two ends.<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Refer to: <a href=3D"=
https://tools.ietf.org/html/rfc4447#section-6">
<span style=3D"color:#1F497D;text-decoration:none">https://tools.ietf.org/=
html/rfc4447#section-6</span></a> and
<a name=3D"appendix-A"></a><a href=3D"https://tools.ietf.org/html/rfc4447#=
appendix-A"><span style=3D"color:#1F497D;text-decoration:none">Appendix A<=
/span></a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">But as EVPN is MP2MP,=
 in case of PE CW behavior can be different between PEs as there is no neg=
otiation at all at the moment.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">So this draft introdu=
ces CW capability which at least allows PEs within EVI knows the capabilit=
y of each other. It also defines behavior after receiving CW capabilities.=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">What I proposed is th=
e behavior in case CW capabilities across PEs are different. I mentioned a=
 simple way of tearing down or isolate CW disabled PEs and raise an alarm,=
 a bit similar to PW. The draft proposes
 a graceful way that traffic can be forwarded with a label advertised toge=
ther with CW capability, such that egress PE can indicate CW via the label=
 on the forwarding plane.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Happy for further dis=
cussion on this as CW of EVPN topic has been raised couple of times recent=
ly.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Thanks &amp; Regards,=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Tim<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein [<a href=3D"mailt=
o:Alexander.Vainshtein@ecitele.com">mailto:Alexander.Vainshtein@ecitele.co=
m</a>]
<br>
<b>Sent:</b> 24 October 2018 09:39<br>
<b>To:</b> Yutianpeng (Tim) &lt;<a href=3D"mailto:yutianpeng@huawei.com">y=
utianpeng@huawei.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@iet=
f.org">draft-wang-bess-evpn-control-word.authors@ietf.org</a>;
<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; Wanghaibo (Rainsword) =
&lt;<a href=3D"mailto:rainsword.wang@huawei.com">rainsword.wang@huawei.com=
</a>&gt;<br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-wor=
d<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Tim,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Lots of thanks for sharing your views.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Unfortunately, I doubt the approach that you propose: always use or =
do not use CW in the same EVI.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">The problem, as I see it is that known unicast and BUM traffic may b=
e handled differently when it comes to EVPN encapsulation:<o:p></o:p></spa=
n></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l3 lev=
el1 lfo2"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-la=
nguage:EN-US"><span style=3D"mso-list:Ignore">1.<span style=3D"font:7.0pt =
&quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">Section 18 of RFC 7432 explicitly s=
tates that =A1=B0When sending EVPN-encapsulated packets over a P2MP LSP or=
 P2P LSP, then the control word SHOULD NOT be
 used=A1=B1<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l3 level2 lfo2">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">a.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">This recommendation is quite reason=
able because the LSPs in question are not affected by ECMP, so there is no=
 need to use the CW to prevent ECMP-cause
 reordering<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l3 level2 lfo2">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">b.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">It is quite possible to P2MP LSPs a=
s the P-tunneling technology delivery of BUM traffic in EVPN while using M=
P2P LSPs for carrying known unicast traffic<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l3 level2 lfo2">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">c.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><b><span style=3D"=
color:#1F497D;mso-fareast-language:EN-US">The bottom line</span></b><span =
style=3D"color:#1F497D;mso-fareast-language:EN-US">: RFC 7432 defines the =
&nbsp;scenario when the CW SHOULD be used in the
 EVPN encapsulation of the known unicast traffic but SHOULD NOT be used in=
 the EVPN encapsulation of BUM traffic as valid<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l3 lev=
el1 lfo2"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-la=
nguage:EN-US"><span style=3D"mso-list:Ignore">2.<span style=3D"font:7.0pt =
&quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">I am aware (this information is pub=
licly available) of at least one deployed EVPN implementation that:<o:p></=
o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l3 level2 lfo2">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">a.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">By default includes the CW in the E=
VPN encapsulation of known unicast traffic (this default behavior can be d=
isabled by explicit configuration)<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l3 level2 lfo2">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">b.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">Does not include the CW in the EVPN=
 encapsulation of BUM traffic, presumably due to limitations imposed by th=
e forwarding HW.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l3 level2 lfo2">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">c.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><b><span style=3D"=
color:#1F497D;mso-fareast-language:EN-US">The bottom line</span></b><span =
style=3D"color:#1F497D;mso-fareast-language:EN-US">: inconsistent usage of=
 CW in the EVPN encapsulation within the
 same EVI (with differences between known unicast and BUM traffic) is alre=
ady a fact on the ground (at least, to some extent).<o:p></o:p></span></p>=

<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">My 2c,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@e=
citele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Yutianpeng (Tim) [<a href=3D"mailto:yu=
tianpeng@huawei.com">mailto:yutianpeng@huawei.com</a>]
<br>
<b>Sent:</b> Tuesday, October 23, 2018 5:48 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein=
@ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;; Wanghaibo (Rainswo=
rd) &lt;<a href=3D"mailto:rainsword.wang@huawei.com">rainsword.wang@huawei=
.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@iet=
f.org">draft-wang-bess-evpn-control-word.authors@ietf.org</a>;
<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a><br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-wor=
d<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi Sasha,<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I am also thinking of=
 this recently but haven=A1=AFt talked with author yet.<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">What was in my mind t=
he solution is actually simple: directly tear down (part of) the mac-VRF o=
r EVI directly if CW capabilities not consistent, considering behavior in =
one EVI should keep consistent (personally
 believe). &nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I might tend to the m=
echanism as below:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">If router A has CW ca=
pabilities and receive type 1 or type 2 routes without CW, then A should d=
rop these routes and report an alarm.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">If router A does not =
has CW capabilities and receive type 1 or type 2 routes with CW, then A sh=
ould drop these routes and report an alarm.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I believe the behavio=
r within EVI or Mac-VRF should keep consistent, otherwise, more questions =
will pop out.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Considering if a serv=
ice is sensitive to packet misordering and it is ELAN, I tend to keep beha=
vior within this ELAN consistent.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">There could also be o=
ther problems with this approach, just share an idea so far open the discu=
ssion.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Regards, and lots of thanks in advance,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Tim<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> BESS [<a href=3D"mailto:bess-bounces@i=
etf.org">mailto:bess-bounces@ietf.org</a>]
<b>On Behalf Of </b>Alexander Vainshtein<br>
<b>Sent:</b> 23 October 2018 14:42<br>
<b>To:</b> Wanghaibo (Rainsword) &lt;<a href=3D"mailto:rainsword.wang@huaw=
ei.com">rainsword.wang@huawei.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@iet=
f.org">draft-wang-bess-evpn-control-word.authors@ietf.org</a>;
<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a><br>
<b>Subject:</b> Re: [bess] A question regarding draft-wang-bess-evepn-cont=
rol-word<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Dear Haibo,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Again,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Lots of thanks for a prompt response.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">My reading of your response is as following:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 lev=
el1 lfo4"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-la=
nguage:EN-US"><span style=3D"mso-list:Ignore">1.<span style=3D"font:7.0pt =
&quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">All egress PEs can receive EVPN-enc=
apsulated packets
<b><i>without the CW</i></b><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 lev=
el1 lfo4"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-la=
nguage:EN-US"><span style=3D"mso-list:Ignore">2.<span style=3D"font:7.0pt =
&quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">All ingress PEs can sent EVPN-encap=
sulated packets
<b><i>without the CW</i></b><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 lev=
el1 lfo4"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-la=
nguage:EN-US"><span style=3D"mso-list:Ignore">3.<span style=3D"font:7.0pt =
&quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">An egress PE that can receive EVPN-=
encapsulated packets with the CW in the EVPN encapsulation, &nbsp;must add=
 the appropriate NH Capability attribute that
 indicates the CW-indicating label value (explicitly or implicitly) to all=
 relevant EVPN routes. &nbsp;This includes:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l0 level2 lfo4">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">a.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">Per-EVI Ethernet A-D route (EVPN Ro=
ute Type 1). In this case the CWI label would follow the label advertised =
in the NLRI of this route<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l0 level2 lfo4">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">b.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">MAC/IP Advertisement route (EVPN Ty=
pe 2 route). In this case the CWI label would follow the label advertised =
in the NLRI as Label1, it would not be
 relevant for packets that are encapsulated using Label2 (used with the Sy=
mmetric EVPN IRB).<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 lev=
el1 lfo4"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-la=
nguage:EN-US"><span style=3D"mso-list:Ignore">4.<span style=3D"font:7.0pt =
&quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">An ingress PE that has received an =
EVPN route with the CW capability attribute wand that can support usage of=
 CW in the EVPN encapsulation, will insert
 both the CWI advertised in the CW capability attribute, and the CW in the=
 EVPN packets it sends to the corresponding egress PE.&nbsp; If it does no=
t support usage of CW in the encapsulation, it will not insert this label.=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Is this understanding correct?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">If yes, I still have a couple of questions:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.7pt;text-indent:-18.=
0pt;mso-list:l1 level1 lfo6">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">1.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">Suppose that you use ingress replic=
ation (IR) to deliver BUM traffic across EVPN. The Ingress Replication lab=
el would be advertised in the PTA attribute
 of the Inclusive Multicast Ethernet Tag Route (EVPN Type 3 route); it wil=
l not be part of the NLRI. Do you expect the same logic to be used with re=
gard to CW capabilities and CWI label advertisement applied also to these =
routes?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.7pt;text-indent:-18.=
0pt;mso-list:l1 level1 lfo6">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">2.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">Per-ES Ethernet A-D Routes are adve=
rtised with the ECI expended Community that carries within the so-called E=
SI label. This label is included the EVPN
 encapsulation of BUM packets sent to the PE that is attached to the same =
multi-homed ES from which the original ES packet has been received. Do you=
 expect the same logic to be used with regard to CW capabilities and CWI l=
abel advertisement applied also to
 these routes with the CWI label following the ESI label in the EVPN encap=
sulation of BUM packets?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Regards, and lots of thanks in advance,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@e=
citele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Wanghaibo (Rainsword) [<a href=3D"mail=
to:rainsword.wang@huawei.com">mailto:rainsword.wang@huawei.com</a>]
<br>
<b>Sent:</b> Tuesday, October 23, 2018 2:34 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein=
@ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; <a href=3D"=
mailto:draft-wang-bess-evpn-control-word.authors@ietf.org">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-wor=
d<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Hi Alexander,<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The solution here is to carry=
 the next hop capability attribute when the route is advertised. The capab=
ility carried here is the control word capability.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The specific format of the ne=
xt hop capability can be referred to the draft.:
<b>&lt;draft-ietf-idr-next-hop-capability&gt;<o:p></o:p></b></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | Capability Code (2 octets)&nbsp;&nbsp; |<o:p></o:p></=
span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | Capability Length (2 octets) |<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | Capability Value (variable)&nbsp; |<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; ~&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ~<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">For the control word capabili=
ty , it may encode as :<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | CW Capabality Type (TBD)&nbsp; &nbsp;&nbsp;&nbsp;|<o:=
p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | CW Length (0 or 3) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | CWI Label (may not exist) &nbsp;&nbsp;&nbsp;|<o:p></o=
:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">CWI (Control word indication)=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">And the forwarding Packet exa=
mple.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&#43;------------------------------&#43;<o:p></o:p=
></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | Tunnel Label &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | EVI Label&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o=
:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | CW Indicate Label &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | Control word&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The difference between the tw=
o methods is that which value should be use for the control word capabilit=
y indicates label.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Method 1, use reserved label,=
 which should be assigned by IANA, (such as the entropy label, which is th=
e value of 7)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">If we use this method, then t=
he control word capability attribute<span lang=3D"ZH-CN">=A1=AF</span>s CW=
 length use 0 is enough.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">And the forwarding packet use=
 the IANA specified value as the CWI (Control word indication) Label .(Per=
haps 8 or others)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Method2, use normal value, wh=
ich is assigned by router.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">If we use this method, then t=
he router must assign a label used for the CWI. Perhaps label. And the con=
trol word capability attribute<span lang=3D"ZH-CN">=A1=AF</span>s
 CW length must be 3 and must contain the value in the update message.<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The forwarding packet must us=
e that value as the CWI label.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Regards,<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Haibo<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein [<a href=3D"mailt=
o:Alexander.Vainshtein@ecitele.com">mailto:Alexander.Vainshtein@ecitele.co=
m</a>]
<br>
<b>Sent:</b> Tuesday, October 23, 2018 6:09 PM<br>
<b>To:</b> Wanghaibo (Rainsword) &lt;<a href=3D"mailto:rainsword.wang@huaw=
ei.com">rainsword.wang@huawei.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; <a href=3D"=
mailto:draft-wang-bess-evpn-control-word.authors@ietf.org">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-wor=
d<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Dear Haibo,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Lots of thanks for an extra-prompt response to my question.<o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">There may be some misunderstanding here.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">The draft says (the important text is highlighted):<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US">&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;There are
<span style=3D"background:yellow;mso-highlight:yellow">two methods</span> =
to specified the control word indicator label:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The first method is to ap=
ply for a reserved label to indicate<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US">&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;whether the packet contai=
ns a control word;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The second method is to
<span style=3D"background:yellow;mso-highlight:yellow">apply for a new lab=
el</span> when the sending<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; router advertises the con=
trol word capability,
<span style=3D"background:yellow;mso-highlight:yellow">which is used to<o:=
p></o:p></span></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;background=
:yellow;mso-highlight:yellow;mso-fareast-language:EN-US">&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; indicate whether the control word is included in the packet<=
/span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Courie=
r New&quot;;mso-fareast-language:EN-US">.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">My question referred just to the 2<sup>nd</sup> method, while your r=
esponse seems to deal with the 1<sup>st</sup> one.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Did I miss something?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@e=
citele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> BESS [<a href=3D"mailto:bess-bounces@i=
etf.org">mailto:bess-bounces@ietf.org</a>]
<b>On Behalf Of </b>Wanghaibo (Rainsword)<br>
<b>Sent:</b> Tuesday, October 23, 2018 12:03 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein=
@ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;;
<a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@ietf.org">draf=
t-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a><br>
<b>Subject:</b> [bess] <span lang=3D"ZH-CN" style=3D"font-family:SimSun">=B4=
=F0=B8=B4</span>: A question regarding draft-wang-bess-evepn-control-word<=
o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Hi Alexander,<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The number of routes advertis=
ed by the Sender router in our solution will not change, but only carries =
a next hop capability attribute with control word
 capability<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The Receiver router determine=
s whether to carry the control word when forwarding packets according to i=
ts own capabilities.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The following figure is an ex=
ample.:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">PE1----------PE2<o:p></o:p></=
span></p>
<p class=3D"MsoNormal" style=3D"text-indent:10.5pt"><span style=3D"font-si=
ze:10.5pt;font-family:&quot;Microsoft YaHei&quot;,sans-serif;color:black">=
|-----------PE3<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">When PE1 advertises a route, =
it carries the next hop attribute of the control word capability. The rout=
es received by PE2 and PE3 are the same.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">If &nbsp;PE2 do not support t=
he control word, it will not carry the control word when forwarding packet=
s to PE1.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">PE1 cannot find the control w=
ord indication label when parsing the PE2 packet. PE1 will treat the packe=
t as normal.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">If &nbsp;PE3 support the cont=
rol word, it can add a control word when forwarding the packet to the PE1,=
 and add the control word indication label specified by
 the PE1. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">When the PE1 receives the pac=
ket and finds the control word indication label in the packet. PE1 will co=
rrectly process the control word.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Thanks<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Haibo<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"ZH-CN" style=3D"font-family:&quot;=
Microsoft YaHei&quot;,sans-serif">=B7=A2=BC=FE=C8=CB</span></b><b><span st=
yle=3D"font-family:&quot;Microsoft YaHei&quot;,sans-serif">:</span></b><sp=
an style=3D"font-family:&quot;Microsoft YaHei&quot;,sans-serif"> Alexander=
 Vainshtein [<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">mailto:Al=
exander.Vainshtein@ecitele.com</a>]
<br>
<b><span lang=3D"ZH-CN">=B7=A2=CB=CD=CA=B1=BC=E4</span>:</b> 2018<span lan=
g=3D"ZH-CN">=C4=EA</span>10<span lang=3D"ZH-CN">=D4=C2</span>23<span lang=3D=
"ZH-CN">=C8=D5</span> 16:46<br>
<b><span lang=3D"ZH-CN">=CA=D5=BC=FE=C8=CB</span>:</b> <a href=3D"mailto:d=
raft-wang-bess-evpn-control-word.authors@ietf.org">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b><span lang=3D"ZH-CN">=B3=AD=CB=CD</span>:</b> <a href=3D"mailto:bess@ie=
tf.org">bess@ietf.org</a><br>
<b><span lang=3D"ZH-CN">=D6=F7=CC=E2</span>:</b> A question regarding draf=
t-wang-bess-evepn-control-word<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Dear authors of <a href=3D"https://tools.ietf.org/h=
tml/draft-wang-bess-evpn-control-word-00">
draft-wang-bess-evpn-control-word</a>,<o:p></o:p></p>
<p class=3D"MsoNormal">I have doubts regarding at least one of the approac=
hes=20for negotiating the CW usage in the EVPN encapsulation between egres=
s and ingress PE that is defined in the draft.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">In the case when the egress PE can receive EVPN-enc=
apsulated packets both with and without CW, the draft seems to propose (as=
 one of the possibilities) advertisement of two EVPN routes for each ES or=
 MAC/IP pair:<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l4 lev=
el1 lfo8"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span styl=
e=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]><span dir=3D"LTR"></span>One of these routes would=
 use the CW Capability to indicate that it refers to the EVPN encapsulatio=
n that uses the CW, and would carry the appropriate label in its NLRI<o:p>=
</o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l4 lev=
el1 lfo8"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span styl=
e=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span><![endif]><span dir=3D"LTR"></span>The other route would not=
 use the CW Capability to indicate that it refers to the EVPN encapsulatio=
n that does not use the CW, and carry a different label in its NLRI<o:p></=
o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The ingress PE that accepts these routes would then=
 use one of them based on its own ability to use the CW (or lack thereof),=
 and use the corresponding label it its EVPN encapsulation, while &nbsp;th=
e DP in the egress PW would infer presence
 or absence of the CW from the received EVPN application label.<o:p></o:p>=
</p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Unfortunately, I do not think that this can work be=
cause, as per
<a href=3D"https://tools.ietf.org/html/rfc7432">RFC 7432</a>, labels in th=
e labeled NLRI of EVPN routes are not part of the route key for the purpos=
e of the BGP route key processing, while the label is treated just as the =
BGP attribute. This means that, unless
 some form of BGP multi-path is enabled in the ingress PE (and in all RRs =
on the way between the egress PE and ingress PE) for the L2VPN/EVPN &nbsp;=
AFI/SAFI, only one of these routes will be selected by the BGP selection p=
rocess.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Did I miss something substantial here?<o:p></o:p></=
p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p><=
/p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Office: &#43;972-39266302<o:p></o:p></p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266=
302<o:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; <a href=3D"mailto:Alexander.Vain=
shtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;T=
imes New Roman&quot;,serif"><br>
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From: John E Drake <jdrake@juniper.net>
To: Alexander Vainshtein <Alexander.Vainshtein@ecitele.com>, "Yutianpeng (Tim)" <yutianpeng@huawei.com>
CC: "bess@ietf.org" <bess@ietf.org>, "draft-wang-bess-evpn-control-word.authors@ietf.org" <draft-wang-bess-evpn-control-word.authors@ietf.org>, "Wanghaibo (Rainsword)" <rainsword.wang@huawei.com>
Thread-Topic: A question regarding draft-wang-bess-evepn-control-word
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Subject: Re: [bess] A question regarding draft-wang-bess-evepn-control-word
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</head>
<body lang=3D"EN-US" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Hi,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Comment inline<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Yours Irrespectively,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">John<o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> BESS &lt;bess-bounces@ietf.org&gt; <b>O=
n Behalf Of </b>
Alexander Vainshtein<br>
<b>Sent:</b> Wednesday, October 24, 2018 11:57 AM<br>
<b>To:</b> Yutianpeng (Tim) &lt;yutianpeng@huawei.com&gt;<br>
<b>Cc:</b> bess@ietf.org; draft-wang-bess-evpn-control-word.authors@ietf.or=
g; Wanghaibo (Rainsword) &lt;rainsword.wang@huawei.com&gt;<br>
<b>Subject:</b> Re: [bess] A question regarding draft-wang-bess-evepn-contr=
ol-word<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Tim,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Lots of thanks for your email, it really clarifies your approach.<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Regarding your proposal to =A1=B0isolate=A1=B1 PEs that do not support=
 the CW - I suspect this is not practical.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">EVPN-MPLS implementations are not REQUIRED to support usage of CW. Som=
e EVPN-MPLS implementations that I am aware of explicitly state that the CW=
 usage can be disabled for interoperability
 with other vendors, so I think that there EVPN implementations that do not=
 support the CW have been deployed.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<pre><span style=3D"color:#1F497D;mso-fareast-language:EN-US"><a href=3D"ht=
tps://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__tools.ietf.org_html_dr=
aft-2Dietf-2Dpals-2Dethernet-2Dcw-2D07&amp;d=3DDwMFoQ&amp;c=3DHAkYuh63rsuhr=
6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&amp;r=3DCRB2tJiQePk0cT-h5LGhEWH-s_xXXup3HzvB=
SMRj5VE&amp;m=3Dg3IVbNU54cy6Djewd3jxs8hIBf3n6Y8tCS54HplvNNE&amp;s=3DRlsyHSL=
6EDro6sABzjF38r6G2sDcGBosVDYDmwnPbZA&amp;e=3D">draft-ietf-pals-ethernet-cw<=
/a> (already in the RFC Editor queue in the AUTH48 state) says that =A1=B0<=
/span><span style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;c=
olor:black;background:yellow;mso-highlight:yellow;mso-fareast-language:EN-U=
S">where both the ingress PE and the egress PE support the Ethernet pseudow=
ire control word</span><span style=3D"font-size:10.0pt;font-family:&quot;Co=
urier New&quot;;color:black;mso-fareast-language:EN-US">, then the CW MUST =
be used</span><span style=3D"color:#1F497D;mso-fareast-language:EN-US">=A1=
=B1. <o:p></o:p></span></pre>
<pre><span style=3D"color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp;</=
o:p></span></pre>
<pre><span style=3D"color:#1F497D;mso-fareast-language:EN-US">Personally I =
think that this sets the goal that we should achieve in EVPN as well:<o:p><=
/o:p></span></pre>
<pre style=3D"margin-left:.5in;text-indent:-.25in;mso-list:l2 level1 lfo2">=
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">1.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><![end=
if]><span style=3D"color:#1F497D;mso-fareast-language:EN-US">All EVPN-MPLS =
implementations MUST support EVPN encapsulations without the CW<o:p></o:p><=
/span></pre>
<pre style=3D"margin-left:.5in;text-indent:-.25in;mso-list:l2 level1 lfo2">=
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">2.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><![end=
if]><span style=3D"color:#1F497D;mso-fareast-language:EN-US">An egress PE S=
HOULD indicate, <span style=3D"background:yellow;mso-highlight:yellow">per =
each L2VPN/EVPN route it advertises</span>, whether it can handle received =
CW in the EVPN encapsulation for packets that are sent to it based on this =
route by ingress PEs, or not, and, if it can, how the presence of the CW is=
 indicated. &nbsp;This can be done using the CW Next-Hop Capability and the=
 CWI label as explained in the draft<o:p></o:p></span></pre>
<pre><b><i><span style=3D"color:#1F497D;mso-fareast-language:EN-US"><o:p>&n=
bsp;</o:p></span></i></b></pre>
<pre><b><i><span style=3D"color:#1F497D;mso-fareast-language:EN-US">[JD]&nb=
sp; I think it would be better to use this draft:&nbsp; &nbsp;&nbsp;<a href=
=3D"https://tools.ietf.org/html/draft-ietf-idr-tunnel-encaps-10">https://to=
ols.ietf.org/html/draft-ietf-idr-tunnel-encaps-10</a><o:p></o:p></span></i>=
</b></pre>
<pre><span style=3D"color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp;</=
o:p></span></pre>
<pre><span style=3D"color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp;</=
o:p></span></pre>
<pre style=3D"margin-left:.5in;text-indent:-.25in;mso-list:l2 level1 lfo2">=
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">3.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><![end=
if]><span style=3D"color:#1F497D;mso-fareast-language:EN-US">An ingress PE =
that accepts a L2VPN/EVPN route with the CW next Hop Capability, MUST inser=
t the CW and indicate its presence, <b><i>if it supports CWI and CW inserti=
on in the appropriate EVPN encapsulation</i></b>. Please note that the abil=
ity to insert CWI and CW may differ for different L2VPN/EVPN routes. E.g.. =
the same PE can:<o:p></o:p></span></pre>
<pre style=3D"margin-left:1.0in;text-indent:-.25in;mso-list:l2 level2 lfo2"=
><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">a.<span style=3D"font:7.0pt &quot;Times=
 New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><![en=
dif]><span style=3D"color:#1F497D;mso-fareast-language:EN-US">Support the C=
WI and CW insertion in the EVPN encapsulation of =A1=B0known unicast=A1=B1 =
frames and BUM frames if their encapsulation does not require insertion of =
the ESI label<o:p></o:p></span></pre>
<pre style=3D"margin-left:1.0in;text-indent:-.25in;mso-list:l2 level2 lfo2"=
><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">b.<span style=3D"font:7.0pt &quot;Times=
 New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><![en=
dif]><span style=3D"color:#1F497D;mso-fareast-language:EN-US">Not support C=
WI and CW insertion in the EVPN encapsulation of BUM frames if this inclusi=
on of the ESI label in their encapsulation is required.<o:p></o:p></span></=
pre>
<pre><span style=3D"color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp;</=
o:p></span></pre>
<pre><span style=3D"color:#1F497D;mso-fareast-language:EN-US">This approach=
 would &nbsp;meet with the old IETF design principle: =A1=B0Be strict in wh=
at you transmit and liberal in what you receive=A1=B1.<o:p></o:p></span></p=
re>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Hope this helps.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">My 2c,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ec=
itele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Yutianpeng (Tim) [<a href=3D"mailto:yut=
ianpeng@huawei.com">mailto:yutianpeng@huawei.com</a>]
<br>
<b>Sent:</b> Wednesday, October 24, 2018 5:32 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein@=
ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@ietf=
.org">draft-wang-bess-evpn-control-word.authors@ietf.org</a>;
<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; Wanghaibo (Rainsword) &=
lt;<a href=3D"mailto:rainsword.wang@huawei.com">rainsword.wang@huawei.com</=
a>&gt;<br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-word=
<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi Sasha,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Thanks a lot for your =
advice.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I agree with you that =
CW is not mandatory for all traffic, mainly unicast. This draft focuses on =
CW capability advertisement and is applicable to traffic needs CW processin=
g. &nbsp;So far BUM should be not relevant
 to this draft. (Multicast might need CW potentially we realize recently, b=
ut we will visit this topic later.)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Some clarification on =
my proposal:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I believe we need a me=
chanism of negotiation on CW capabilities in EVPN ELAN. If you check PW or =
EVPN VPWS there is a clear procedure on negotiation between two ends.<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Refer to: <a href=3D"h=
ttps://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__tools.ietf.org_html_r=
fc4447-23section-2D6&amp;d=3DDwMFoQ&amp;c=3DHAkYuh63rsuhr6Scbfh0UjBXeMK-ndb=
3voDTXcWzoCI&amp;r=3DCRB2tJiQePk0cT-h5LGhEWH-s_xXXup3HzvBSMRj5VE&amp;m=3Dg3=
IVbNU54cy6Djewd3jxs8hIBf3n6Y8tCS54HplvNNE&amp;s=3DNBPHKHjAHD92xWWgTzgyFMNLR=
RjgyaGjNsqLclZyQYw&amp;e=3D">
<span style=3D"color:#1F497D;text-decoration:none">https://tools.ietf.org/h=
tml/rfc4447#section-6</span></a> and
<a name=3D"appendix-A"></a><a href=3D"https://urldefense.proofpoint.com/v2/=
url?u=3Dhttps-3A__tools.ietf.org_html_rfc4447-23appendix-2DA&amp;d=3DDwMFoQ=
&amp;c=3DHAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&amp;r=3DCRB2tJiQePk0cT=
-h5LGhEWH-s_xXXup3HzvBSMRj5VE&amp;m=3Dg3IVbNU54cy6Djewd3jxs8hIBf3n6Y8tCS54H=
plvNNE&amp;s=3DO9MUigxU7UJ6prd0ZtH3-87IEYswalB2pRb1_UuKPyM&amp;e=3D"><span =
style=3D"color:#1F497D;text-decoration:none">Appendix
 A</span></a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">But as EVPN is MP2MP, =
in case of PE CW behavior can be different between PEs as there is no negot=
iation at all at the moment.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">So this draft introduc=
es CW capability which at least allows PEs within EVI knows the capability =
of each other. It also defines behavior after receiving CW capabilities.<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">What I proposed is the=
 behavior in case CW capabilities across PEs are different. I mentioned a s=
imple way of tearing down or isolate CW disabled PEs and raise an alarm, a =
bit similar to PW. The draft proposes
 a graceful way that traffic can be forwarded with a label advertised toget=
her with CW capability, such that egress PE can indicate CW via the label o=
n the forwarding plane.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Happy for further disc=
ussion on this as CW of EVPN topic has been raised couple of times recently=
.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Thanks &amp; Regards,<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Tim<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein [<a href=3D"mailto=
:Alexander.Vainshtein@ecitele.com">mailto:Alexander.Vainshtein@ecitele.com<=
/a>]
<br>
<b>Sent:</b> 24 October 2018 09:39<br>
<b>To:</b> Yutianpeng (Tim) &lt;<a href=3D"mailto:yutianpeng@huawei.com">yu=
tianpeng@huawei.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@ietf=
.org">draft-wang-bess-evpn-control-word.authors@ietf.org</a>;
<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; Wanghaibo (Rainsword) &=
lt;<a href=3D"mailto:rainsword.wang@huawei.com">rainsword.wang@huawei.com</=
a>&gt;<br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-word=
<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Tim,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Lots of thanks for sharing your views.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Unfortunately, I doubt the approach that you propose: always use or do=
 not use CW in the same EVI.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">The problem, as I see it is that known unicast and BUM traffic may be =
handled differently when it comes to EVPN encapsulation:<o:p></o:p></span><=
/p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l3 level=
1 lfo4"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-langu=
age:EN-US"><span style=3D"mso-list:Ignore">1.<span style=3D"font:7.0pt &quo=
t;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">Section 18 of RFC 7432 explicitly states that =A1=B0When sendi=
ng EVPN-encapsulated packets over a P2MP LSP or P2P LSP, then the control w=
ord SHOULD NOT be used=A1=B1<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:1.0in;text-indent:-.25in=
;mso-list:l3 level2 lfo4">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">a.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">This recommendation is quite reasonable because the LSPs in qu=
estion are not affected by ECMP, so there is no need to use the CW to preve=
nt ECMP-cause reordering<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:1.0in;text-indent:-.25in=
;mso-list:l3 level2 lfo4">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">b.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">It is quite possible to P2MP LSPs as the P-tunneling technolog=
y delivery of BUM traffic in EVPN while using MP2P LSPs for carrying known =
unicast traffic<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:1.0in;text-indent:-.25in=
;mso-list:l3 level2 lfo4">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">c.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><b><span style=3D"color:#1F497D;mso-fareast-=
language:EN-US">The bottom line</span></b><span style=3D"color:#1F497D;mso-=
fareast-language:EN-US">: RFC 7432 defines the &nbsp;scenario when the CW S=
HOULD be used in the EVPN encapsulation of
 the known unicast traffic but SHOULD NOT be used in the EVPN encapsulation=
 of BUM traffic as valid<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l3 level=
1 lfo4"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-langu=
age:EN-US"><span style=3D"mso-list:Ignore">2.<span style=3D"font:7.0pt &quo=
t;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">I am aware (this information is publicly available) of at leas=
t one deployed EVPN implementation that:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:1.0in;text-indent:-.25in=
;mso-list:l3 level2 lfo4">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">a.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">By default includes the CW in the EVPN encapsulation of known =
unicast traffic (this default behavior can be disabled by explicit configur=
ation)<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:1.0in;text-indent:-.25in=
;mso-list:l3 level2 lfo4">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">b.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">Does not include the CW in the EVPN encapsulation of BUM traff=
ic, presumably due to limitations imposed by the forwarding HW.<o:p></o:p><=
/span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:1.0in;text-indent:-.25in=
;mso-list:l3 level2 lfo4">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">c.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><b><span style=3D"color:#1F497D;mso-fareast-=
language:EN-US">The bottom line</span></b><span style=3D"color:#1F497D;mso-=
fareast-language:EN-US">: inconsistent usage of CW in the EVPN encapsulatio=
n within the same EVI (with differences
 between known unicast and BUM traffic) is already a fact on the ground (at=
 least, to some extent).<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">My 2c,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ec=
itele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Yutianpeng (Tim) [<a href=3D"mailto:yut=
ianpeng@huawei.com">mailto:yutianpeng@huawei.com</a>]
<br>
<b>Sent:</b> Tuesday, October 23, 2018 5:48 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein@=
ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;; Wanghaibo (Rainsword=
) &lt;<a href=3D"mailto:rainsword.wang@huawei.com">rainsword.wang@huawei..c=
om</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@ietf=
.org">draft-wang-bess-evpn-control-word.authors@ietf.org</a>;
<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a><br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-word=
<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi Sasha,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I am also thinking of =
this recently but haven=A1=AFt talked with author yet.<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">What was in my mind th=
e solution is actually simple: directly tear down (part of) the mac-VRF or =
EVI directly if CW capabilities not consistent, considering behavior in one=
 EVI should keep consistent (personally
 believe). &nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I might tend to the me=
chanism as below:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">If router A has CW cap=
abilities and receive type 1 or type 2 routes without CW, then A should dro=
p these routes and report an alarm.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">If router A does not h=
as CW capabilities and receive type 1 or type 2 routes with CW, then A shou=
ld drop these routes and report an alarm.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I believe the behavior=
 within EVI or Mac-VRF should keep consistent, otherwise, more questions wi=
ll pop out.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Considering if a servi=
ce is sensitive to packet misordering and it is ELAN, I tend to keep behavi=
or within this ELAN consistent.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">There could also be ot=
her problems with this approach, just share an idea so far open the discuss=
ion.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Regards, and lots of thanks in advance,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Tim<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> BESS [<a href=3D"mailto:bess-bounces@ie=
tf.org">mailto:bess-bounces@ietf.org</a>]
<b>On Behalf Of </b>Alexander Vainshtein<br>
<b>Sent:</b> 23 October 2018 14:42<br>
<b>To:</b> Wanghaibo (Rainsword) &lt;<a href=3D"mailto:rainsword.wang@huawe=
i.com">rainsword.wang@huawei.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@ietf=
.org">draft-wang-bess-evpn-control-word.authors@ietf.org</a>;
<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a><br>
<b>Subject:</b> Re: [bess] A question regarding draft-wang-bess-evepn-contr=
ol-word<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Dear Haibo,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Again,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Lots of thanks for a prompt response.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">My reading of your response is as following:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo6"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-langu=
age:EN-US"><span style=3D"mso-list:Ignore">1.<span style=3D"font:7.0pt &quo=
t;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">All egress PEs can receive EVPN-encapsulated packets
<b><i>without the CW</i></b><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo6"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-langu=
age:EN-US"><span style=3D"mso-list:Ignore">2.<span style=3D"font:7.0pt &quo=
t;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">All ingress PEs can sent EVPN-encapsulated packets
<b><i>without the CW</i></b><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo6"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-langu=
age:EN-US"><span style=3D"mso-list:Ignore">3.<span style=3D"font:7.0pt &quo=
t;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">An egress PE that can receive EVPN-encapsulated packets with t=
he CW in the EVPN encapsulation, &nbsp;must add the appropriate NH Capabili=
ty attribute that indicates the CW-indicating
 label value (explicitly or implicitly) to all relevant EVPN routes. &nbsp;=
This includes:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:1.0in;text-indent:-.25in=
;mso-list:l0 level2 lfo6">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">a.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">Per-EVI Ethernet A-D route (EVPN Route Type 1). In this case t=
he CWI label would follow the label advertised in the NLRI of this route<o:=
p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:1.0in;text-indent:-.25in=
;mso-list:l0 level2 lfo6">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">b.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">MAC/IP Advertisement route (EVPN Type 2 route). In this case t=
he CWI label would follow the label advertised in the NLRI as Label1, it wo=
uld not be relevant for packets that
 are encapsulated using Label2 (used with the Symmetric EVPN IRB).<o:p></o:=
p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo6"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-langu=
age:EN-US"><span style=3D"mso-list:Ignore">4.<span style=3D"font:7.0pt &quo=
t;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">An ingress PE that has received an EVPN route with the CW capa=
bility attribute wand that can support usage of CW in the EVPN encapsulatio=
n, will insert both the CWI advertised
 in the CW capability attribute, and the CW in the EVPN packets it sends to=
 the corresponding egress PE.&nbsp; If it does not support usage of CW in t=
he encapsulation, it will not insert this label.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Is this understanding correct?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">If yes, I still have a couple of questions:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.7pt;text-indent:-.25i=
n;mso-list:l1 level1 lfo8">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">1.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">Suppose that you use ingress replication (IR) to deliver BUM t=
raffic across EVPN. The Ingress Replication label would be advertised in th=
e PTA attribute of the Inclusive Multicast
 Ethernet Tag Route (EVPN Type 3 route); it will not be part of the NLRI. D=
o you expect the same logic to be used with regard to CW capabilities and C=
WI label advertisement applied also to these routes?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.7pt;text-indent:-.25i=
n;mso-list:l1 level1 lfo8">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">2.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">Per-ES Ethernet A-D Routes are advertised with the ECI expende=
d Community that carries within the so-called ESI label. This label is incl=
uded the EVPN encapsulation of BUM
 packets sent to the PE that is attached to the same multi-homed ES from wh=
ich the original ES packet has been received. Do you expect the same logic =
to be used with regard to CW capabilities and CWI label advertisement appli=
ed also to these routes with the
 CWI label following the ESI label in the EVPN encapsulation of BUM packets=
?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Regards, and lots of thanks in advance,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ec=
itele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Wanghaibo (Rainsword) [<a href=3D"mailt=
o:rainsword.wang@huawei.com">mailto:rainsword.wang@huawei.com</a>]
<br>
<b>Sent:</b> Tuesday, October 23, 2018 2:34 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein@=
ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; <a href=3D"m=
ailto:draft-wang-bess-evpn-control-word.authors@ietf.org">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-word=
<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black">Hi Alexander,<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black">The solution here is to carry t=
he next hop capability attribute when the route is advertised. The capabili=
ty carried here is the control word capability.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black">The specific format of the next=
 hop capability can be referred to the draft.:
<b>&lt;draft-ietf-idr-next-hop-capability&gt;<o:p></o:p></b></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | Capability Code (2 octets)&nbsp;&nbsp; |<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | Capability Length (2 octets) |<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | Capability Value (variable)&nbsp; |<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; ~&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ~<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black">For the control word capability=
 , it may encode as :<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | CW Capabality Type (TBD)&nbsp; &nbsp;&nbsp;&nbsp;|<o:p></=
o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | CW Length (0 or 3) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | CWI Label (may not exist) &nbsp;&nbsp;&nbsp;|<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black">CWI (Control word indication)<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black">And the forwarding Packet examp=
le.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&#43;------------------------------&#43;<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | Tunnel Label &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | EVI Label&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></=
o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | CW Indicate Label &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | Control word&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black">The difference between the two =
methods is that which value should be use for the control word capability i=
ndicates label.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black">Method 1, use reserved label, w=
hich should be assigned by IANA, (such as the entropy label, which is the v=
alue of 7)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black">If we use this method, then the=
 control word capability attribute<span lang=3D"ZH-CN">=A1=AF</span>s CW le=
ngth use 0 is enough.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black">And the forwarding packet use t=
he IANA specified value as the CWI (Control word indication) Label .(Perhap=
s 8 or others)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black">Method2, use normal value, whic=
h is assigned by router.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black">If we use this method, then the=
 router must assign a label used for the CWI. Perhaps label. And the contro=
l word capability attribute<span lang=3D"ZH-CN">=A1=AF</span>s
 CW length must be 3 and must contain the value in the update message.<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black">The forwarding packet must use =
that value as the CWI label.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black">Regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black">Haibo<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein [<a href=3D"mailto=
:Alexander.Vainshtein@ecitele.com">mailto:Alexander.Vainshtein@ecitele.com<=
/a>]
<br>
<b>Sent:</b> Tuesday, October 23, 2018 6:09 PM<br>
<b>To:</b> Wanghaibo (Rainsword) &lt;<a href=3D"mailto:rainsword.wang@huawe=
i.com">rainsword.wang@huawei.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; <a href=3D"m=
ailto:draft-wang-bess-evpn-control-word.authors@ietf.org">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-word=
<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Dear Haibo,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Lots of thanks for an extra-prompt response to my question.<o:p></o:p>=
</span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">There may be some misunderstanding here.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">The draft says (the important text is highlighted):<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;There are
<span style=3D"background:yellow;mso-highlight:yellow">two methods</span> t=
o specified the control word indicator label:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The first method is to apply=
 for a reserved label to indicate<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;whether the packet contains =
a control word;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The second method is to
<span style=3D"background:yellow;mso-highlight:yellow">apply for a new labe=
l</span> when the sending<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; router advertises the contro=
l word capability,
<span style=3D"background:yellow;mso-highlight:yellow">which is used to<o:p=
></o:p></span></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;background:y=
ellow;mso-highlight:yellow;mso-fareast-language:EN-US">&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; indicate whether the control word is included in the packet</spa=
n><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Courier New=
&quot;;mso-fareast-language:EN-US">.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">My question referred just to the 2<sup>nd</sup> method, while your res=
ponse seems to deal with the 1<sup>st</sup> one.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Did I miss something?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ec=
itele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b>From:</b> BESS [<a href=3D"mailto:bess-bounces@ie=
tf.org">mailto:bess-bounces@ietf.org</a>]
<b>On Behalf Of </b>Wanghaibo (Rainsword)<br>
<b>Sent:</b> Tuesday, October 23, 2018 12:03 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein@=
ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;;
<a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@ietf.org">draft=
-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a><br>
<b>Subject:</b> [bess] <span lang=3D"ZH-CN" style=3D"font-family:SimSun">=
=B4=F0=B8=B4</span>: A question regarding draft-wang-bess-evepn-control-wor=
d<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black">Hi Alexander,<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black">The number of routes advertised=
 by the Sender router in our solution will not change, but only carries a n=
ext hop capability attribute with control word
 capability<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black">The Receiver router determines =
whether to carry the control word when forwarding packets according to its =
own capabilities.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black">The following figure is an exam=
ple.:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black">PE1----------PE2<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"text-indent:10.5pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;Microsoft YaHei&quot;,sans-serif;color:black">|-=
----------PE3<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black">When PE1 advertises a route, it=
 carries the next hop attribute of the control word capability. The routes =
received by PE2 and PE3 are the same.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black">If &nbsp;PE2 do not support the=
 control word, it will not carry the control word when forwarding packets t=
o PE1.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black">PE1 cannot find the control wor=
d indication label when parsing the PE2 packet. PE1 will treat the packet a=
s normal.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black">If &nbsp;PE3 support the contro=
l word, it can add a control word when forwarding the packet to the PE1, an=
d add the control word indication label specified by
 the PE1. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black">When the PE1 receives the packe=
t and finds the control word indication label in the packet. PE1 will corre=
ctly process the control word.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black">Thanks<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black">Haibo<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;Mi=
crosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span lang=3D"ZH-CN" style=3D"font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif">=B7=A2=BC=FE=C8=CB</span></b><b><span styl=
e=3D"font-family:&quot;Microsoft YaHei&quot;,sans-serif">:</span></b><span =
style=3D"font-family:&quot;Microsoft YaHei&quot;,sans-serif"> Alexander Vai=
nshtein [<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">mailto:Alexand=
er.Vainshtein@ecitele.com</a>]
<br>
<b><span lang=3D"ZH-CN">=B7=A2=CB=CD=CA=B1=BC=E4</span>:</b> 2018<span lang=
=3D"ZH-CN">=C4=EA</span>10<span lang=3D"ZH-CN">=D4=C2</span>23<span lang=3D=
"ZH-CN">=C8=D5</span> 16:46<br>
<b><span lang=3D"ZH-CN">=CA=D5=BC=FE=C8=CB</span>:</b> <a href=3D"mailto:dr=
aft-wang-bess-evpn-control-word.authors@ietf.org">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b><span lang=3D"ZH-CN">=B3=AD=CB=CD</span>:</b> <a href=3D"mailto:bess@iet=
f.org">bess@ietf.org</a><br>
<b><span lang=3D"ZH-CN">=D6=F7=CC=E2</span>:</b> A question regarding draft=
-wang-bess-evepn-control-word<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Dear authors of <a href=3D"https://urldefense.proofp=
oint.com/v2/url?u=3Dhttps-3A__tools.ietf.org_html_draft-2Dwang-2Dbess-2Devp=
n-2Dcontrol-2Dword-2D00&amp;d=3DDwMFoQ&amp;c=3DHAkYuh63rsuhr6Scbfh0UjBXeMK-=
ndb3voDTXcWzoCI&amp;r=3DCRB2tJiQePk0cT-h5LGhEWH-s_xXXup3HzvBSMRj5VE&amp;m=
=3Dg3IVbNU54cy6Djewd3jxs8hIBf3n6Y8tCS54HplvNNE&amp;s=3DwszxoY3qdrIHkit3qIXz=
uYJrQJKe-90c2fu3AJvqwlw&amp;e=3D">
draft-wang-bess-evpn-control-word</a>,<o:p></o:p></p>
<p class=3D"MsoNormal">I have doubts regarding at least one of the approach=
es for negotiating the CW usage in the EVPN encapsulation between egress an=
d ingress PE that is defined in the draft.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">In the case when the egress PE can receive EVPN-enca=
psulated packets both with and without CW, the draft seems to propose (as o=
ne of the possibilities) advertisement of two EVPN routes for each ES or MA=
C/IP pair:<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l4 level=
1 lfo10"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;
</span></span><![endif]>One of these routes would use the CW Capability to =
indicate that it refers to the EVPN encapsulation that uses the CW, and wou=
ld carry the appropriate label in its NLRI<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l4 level=
1 lfo10"><![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=
=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;
</span></span><![endif]>The other route would not use the CW Capability to =
indicate that it refers to the EVPN encapsulation that does not use the CW,=
 and carry a different label in its NLRI<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The ingress PE that accepts these routes would then =
use one of them based on its own ability to use the CW (or lack thereof), a=
nd use the corresponding label it its EVPN encapsulation, while &nbsp;the D=
P in the egress PW would infer presence
 or absence of the CW from the received EVPN application label.<o:p></o:p><=
/p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Unfortunately, I do not think that this can work bec=
ause, as per
<a href=3D"https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__tools.iet=
f.org_html_rfc7432&amp;d=3DDwMFoQ&amp;c=3DHAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3v=
oDTXcWzoCI&amp;r=3DCRB2tJiQePk0cT-h5LGhEWH-s_xXXup3HzvBSMRj5VE&amp;m=3Dg3IV=
bNU54cy6Djewd3jxs8hIBf3n6Y8tCS54HplvNNE&amp;s=3DYoT9XgzHA1XwCe6z755-DP6mPdI=
zYKlzA0L-uxm9pVk&amp;e=3D">
RFC 7432</a>, labels in the labeled NLRI of EVPN routes are not part of the=
 route key for the purpose of the BGP route key processing, while the label=
 is treated just as the BGP attribute. This means that, unless some form of=
 BGP multi-path is enabled in the
 ingress PE (and in all RRs on the way between the egress PE and ingress PE=
) for the L2VPN/EVPN &nbsp;AFI/SAFI, only one of these routes will be selec=
ted by the BGP selection process.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Did I miss something substantial here?<o:p></o:p></p=
>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p></=
p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Office: &#43;972-39266302<o:p></o:p></p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-5492663=
02<o:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; <a href=3D"mailto:Alexander.Vains=
htein@ecitele.com">Alexander.Vainshtein@ecitele.com</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ti=
mes New Roman&quot;,serif"><br>
___________________________________________________________________________=
<br>
<br>
This e-mail message is intended for the recipient only and contains informa=
tion which is
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CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have recei=
ved this
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transmission in error, please inform us by e-mail, phone or fax, and then d=
elete the original
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___________________________________________________________________________=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:SimSun">=
<br>
___________________________________________________________________________=
<br>
<br>
This e-mail message is intended for the recipient only and contains informa=
tion which is
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CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have recei=
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transmission in error, please inform us by e-mail, phone or fax, and then d=
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___________________________________________________________________________=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:SimSun">=
<br>
___________________________________________________________________________=
<br>
<br>
This e-mail message is intended for the recipient only and contains informa=
tion which is
<br>
CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have recei=
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transmission in error, please inform us by e-mail, phone or fax, and then d=
elete the original
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___________________________________________________________________________=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:SimSun">=
<br>
___________________________________________________________________________=
<br>
<br>
This e-mail message is intended for the recipient only and contains informa=
tion which is
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CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have recei=
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transmission in error, please inform us by e-mail, phone or fax, and then d=
elete the original
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and all copies thereof.<br>
___________________________________________________________________________=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:SimSun">=
<br>
___________________________________________________________________________=
<br>
<br>
This e-mail message is intended for the recipient only and contains informa=
tion which is
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CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have recei=
ved this
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From: Donald Eastlake <d3e3e3@gmail.com>
Date: Wed, 24 Oct 2018 13:18:47 -0400
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Subject: [bess] Revision of draft-salam-bess-evpn-oam-req-frmwk posted
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Hi,

Revised draft draft-salam-bess-evpn-oam-req-frmwk-01.txt has been posted to
resolve the comments in the thread on the BESS WG mailing list with subject
"EVPN FECs in LSP Ping". At the BESS WG meeting in Bangkok, I plan to ask
that this draft become a WG draft. Please take a look.

Thanks,
Donald
===============================
 Donald E. Eastlake 3rd   +1-508-333-2270 (cell)
 1424 Pro Shop Court, Davenport, FL 33896 USA
 d3e3e3@gmail.com

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<div dir=3D"ltr">Hi,<div><br></div><div>Revised draft draft-salam-bess-evpn=
-oam-req-frmwk-01.txt has been posted to resolve the comments in the thread=
 on the BESS WG mailing=C2=A0list with subject &quot;EVPN FECs in LSP Ping&=
quot;. At the BESS WG meeting in Bangkok, I plan to ask that this draft bec=
ome a WG draft. Please take a look.</div><div><br clear=3D"all"><div><div d=
ir=3D"ltr" class=3D"gmail_signature" data-smartmail=3D"gmail_signature">Tha=
nks,<br>Donald<br>=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<br>=C2=A0Donald E. Eastlake 3rd =C2=A0=
 +1-508-333-2270 (cell)<br>=C2=A01424 Pro Shop Court, Davenport, FL 33896 U=
SA<br>=C2=A0<a href=3D"mailto:d3e3e3@gmail.com" target=3D"_blank">d3e3e3@gm=
ail.com</a></div></div></div></div>

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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi,<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">My concern is if we sh=
ould encourage the behavior that CW enabled PE can communicate with CW disa=
bled PE.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Let=A1=AFs assume scen=
ario below: <o:p>
</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">A, B</span><span style=
=3D"color:#1F497D"> and C are in the same EVI. A and C enable CW and B disa=
ble CW.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">A(CW)---- B(CW Disable=
d)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">|&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp; /<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">|&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; /<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">|&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp; /<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">C (CW)<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Question 1: As we know=
 CW is to disable ECMP to for services
</span><span style=3D"color:#1F497D">sensitive to packet misordering. Do we=
 have a kind of ELAN service misordering sensitive between A&lt;-&gt;C but =
not A&lt;-&gt;B? &nbsp;Even yes, can we disable
</span><span style=3D"color:#1F497D">ECMP </span><span style=3D"color:#1F49=
7D">for whole EVI instead of enabling ECMP on a particular path.<o:p></o:p>=
</span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Question</span><span s=
tyle=3D"color:#1F497D"> 2: If a mechanism allowing communication between A&=
lt;-&gt;B and C&lt;-&gt;B, even B is misconfigured, everything will still w=
ork without any notice but service is disrupted (misordering
 A-&gt;B and C-&gt;B happens). <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">In PW or even VPLS, ne=
gotiation will not succeed if CW capability on both ends is not same.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Then in EVPN, I am thi=
nking we should use a direct decision similar to PW, or obscure one enables=
 communication between CW and CW disabled.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">My approach is after n=
egotiation, only A&lt;-&gt;C communicates, but A&lt;-&gt;B C&lt;-&gt;B cann=
ot communicate until B enables CW as it very likely leads to services disru=
ption.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Then designers and mai=
ntenance have a clear idea of whether each ELAN is misordering sensitive or=
 not.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">In case there are othe=
r services not sensitive to misordering, we can have a new EVI and put it i=
n other VLANs.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Thanks,<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Tim<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein [mailto:Alexander.=
Vainshtein@ecitele.com]
<br>
<b>Sent:</b> 24 October 2018 16:57<br>
<b>To:</b> Yutianpeng (Tim) &lt;yutianpeng@huawei.com&gt;<br>
<b>Cc:</b> draft-wang-bess-evpn-control-word.authors@ietf.org; bess@ietf.or=
g; Wanghaibo (Rainsword) &lt;rainsword.wang@huawei.com&gt;<br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-word=
<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Tim,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Lots of thanks for your email, it really clarifies your approach.<o:p>=
</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Regarding your proposal to =A1=B0isolate=A1=B1 PEs that do not support=
 the CW - I suspect this is not practical.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">EVPN-MPLS implementations are not REQUIRED to support usage of CW. Som=
e EVPN-MPLS implementations that I am aware of explicitly state that the CW=
 usage can be disabled for interoperability
 with other vendors, so I think that there EVPN implementations that do not=
 support the CW have been deployed.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<pre><span style=3D"color:#1F497D;mso-fareast-language:EN-US"><a href=3D"ht=
tps://tools.ietf.org/html/draft-ietf-pals-ethernet-cw-07">draft-ietf-pals-e=
thernet-cw</a> (already in the RFC Editor queue in the AUTH48 state) says t=
hat =A1=B0</span><span style=3D"font-size:10.0pt;font-family:&quot;Courier =
New&quot;;color:black;background:yellow;mso-highlight:yellow;mso-fareast-la=
nguage:EN-US">where both the ingress PE and the egress PE support the Ether=
net pseudowire control word</span><span style=3D"font-size:10.0pt;font-fami=
ly:&quot;Courier New&quot;;color:black;mso-fareast-language:EN-US">, then t=
he CW MUST be used</span><span style=3D"color:#1F497D;mso-fareast-language:=
EN-US">=A1=B1. <o:p></o:p></span></pre>
<pre><span style=3D"color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp;</=
o:p></span></pre>
<pre><span style=3D"color:#1F497D;mso-fareast-language:EN-US">Personally</s=
pan><span style=3D"color:#1F497D;mso-fareast-language:EN-US"> I think that =
this sets the goal that we should achieve in EVPN as well:<o:p></o:p></span=
></pre>
<pre style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-list:l2 level1 lfo=
2"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><span style=3D"mso-list:Ignore">1.<span style=3D"font:7.0pt &quot;Tim=
es New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></sp=
an><![endif]><span style=3D"color:#1F497D;mso-fareast-language:EN-US">All E=
VPN-MPLS implementations MUST support EVPN encapsulations without the CW<o:=
p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-list:l2 level1 lfo=
2"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><span style=3D"mso-list:Ignore">2.<span style=3D"font:7.0pt &quot;Tim=
es New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></sp=
an><![endif]><span style=3D"color:#1F497D;mso-fareast-language:EN-US">An eg=
ress PE SHOULD indicate, <span style=3D"background:yellow;mso-highlight:yel=
low">per each L2VPN/EVPN route it advertises</span>, whether it can handle =
received CW in the EVPN encapsulation for packets that are sent to it based=
 on this route by ingress PEs, or not, and, if it can, how the presence of =
the CW is indicated. &nbsp;This can be done using the CW Next-Hop Capabilit=
y and the CWI label as explained in the draft<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-list:l2 level1 lfo=
2"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><span style=3D"mso-list:Ignore">3.<span style=3D"font:7.0pt &quot;Tim=
es New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></sp=
an><![endif]><span style=3D"color:#1F497D;mso-fareast-language:EN-US">An in=
gress PE that accepts a L2VPN/EVPN route with the CW next Hop Capability, M=
UST insert the CW and indicate its presence, <b><i>if it supports CWI and C=
W insertion in the appropriate EVPN encapsulation</i></b>. Please note that=
 the ability to insert CWI and CW may differ for different L2VPN/EVPN route=
s. E.g.. the same PE can:<o:p></o:p></span></pre>
<pre style=3D"margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level2 lfo=
2"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><span style=3D"mso-list:Ignore">a.<span style=3D"font:7.0pt &quot;Tim=
es New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></sp=
an><![endif]><span style=3D"color:#1F497D;mso-fareast-language:EN-US">Suppo=
rt the CWI and CW insertion in the EVPN encapsulation of =A1=B0known unicas=
t=A1=B1 frames and BUM frames if their encapsulation does not require inser=
tion of the ESI label<o:p></o:p></span></pre>
<pre style=3D"margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level2 lfo=
2"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><span style=3D"mso-list:Ignore">b.<span style=3D"font:7.0pt &quot;Tim=
es New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span></span><![=
endif]><span style=3D"color:#1F497D;mso-fareast-language:EN-US">Not support=
 CWI and CW insertion in the EVPN encapsulation of BUM frames if this inclu=
sion of the ESI label in their encapsulation is required.<o:p></o:p></span>=
</pre>
<pre><span style=3D"color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp;</=
o:p></span></pre>
<pre><span style=3D"color:#1F497D;mso-fareast-language:EN-US">This approach=
 would &nbsp;meet with the old IETF design principle: =A1=B0Be strict in wh=
at you transmit and liberal in what you receive=A1=B1.<o:p></o:p></span></p=
re>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Hope this helps.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">My 2c,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ec=
itele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Yutianpeng (Tim) [<a href=3D"mailto:yut=
ianpeng@huawei.com">mailto:yutianpeng@huawei.com</a>]
<br>
<b>Sent:</b> Wednesday, October 24, 2018 5:32 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein@=
ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@ietf=
.org">draft-wang-bess-evpn-control-word.authors@ietf.org</a>;
<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; Wanghaibo (Rainsword) &=
lt;<a href=3D"mailto:rainsword.wang@huawei.com">rainsword.wang@huawei.com</=
a>&gt;<br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-word=
<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi Sasha,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Thanks a lot for your =
advice.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I agree with you that =
CW is not mandatory for all traffic, mainly unicast. This draft focuses on =
CW capability advertisement and is applicable to traffic needs CW processin=
g. &nbsp;So far BUM should be not relevant
 to this draft. (Multicast might need CW potentially we realize recently, b=
ut we will visit this topic later.)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Some clarification on =
my proposal:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I believe we need a me=
chanism of negotiation on CW capabilities in EVPN ELAN. If you check PW or =
EVPN VPWS there is a clear procedure on negotiation between two ends.<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Refer to: <a href=3D"h=
ttps://tools.ietf.org/html/rfc4447#section-6">
<span style=3D"color:#1F497D;text-decoration:none">https://tools.ietf.org/h=
tml/rfc4447#section-6</span></a> and
<a name=3D"appendix-A"></a><a href=3D"https://tools.ietf.org/html/rfc4447#a=
ppendix-A"><span style=3D"color:#1F497D;text-decoration:none">Appendix A</s=
pan></a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">But as EVPN is MP2MP, =
in case of PE CW behavior can be different between PEs as there is no negot=
iation at all at the moment.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">So this draft introduc=
es CW capability which at least allows PEs within EVI knows the capability =
of each other. It also defines behavior after receiving CW capabilities.<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">What I proposed is the=
 behavior in case CW capabilities across PEs are different. I mentioned a s=
imple way of tearing down or isolate CW disabled PEs and raise an alarm, a =
bit similar to PW. The draft proposes
 a graceful way that traffic can be forwarded with a label advertised toget=
her with CW capability, such that egress PE can indicate CW via the label o=
n the forwarding plane.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Happy for further disc=
ussion on this as CW of EVPN topic has been raised couple of times recently=
.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Thanks &amp; Regards,<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Tim<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein [<a href=3D"mailto=
:Alexander.Vainshtein@ecitele.com">mailto:Alexander.Vainshtein@ecitele.com<=
/a>]
<br>
<b>Sent:</b> 24 October 2018 09:39<br>
<b>To:</b> Yutianpeng (Tim) &lt;<a href=3D"mailto:yutianpeng@huawei.com">yu=
tianpeng@huawei.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@ietf=
.org">draft-wang-bess-evpn-control-word.authors@ietf.org</a>;
<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; Wanghaibo (Rainsword) &=
lt;<a href=3D"mailto:rainsword.wang@huawei.com">rainsword.wang@huawei.com</=
a>&gt;<br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-word=
<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Tim,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Lots of thanks for sharing your views.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Unfortunately, I doubt the approach that you propose: always use or do=
 not use CW in the same EVI.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">The problem, as I see it is that known unicast and BUM traffic may be =
handled differently when it comes to EVPN encapsulation:<o:p></o:p></span><=
/p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l3 leve=
l1 lfo4"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-lang=
uage:EN-US"><span style=3D"mso-list:Ignore">1.<span style=3D"font:7.0pt &qu=
ot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">Section 18 of RFC 7432 explicitly states that =A1=B0When sendi=
ng EVPN-encapsulated packets over a P2MP LSP or P2P LSP, then the control w=
ord SHOULD NOT be used=A1=B1<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l3 level2 lfo4">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">a.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">This recommendation is quite reasonable because the LSPs in qu=
estion are not affected by ECMP, so there is no need to use the CW to preve=
nt ECMP-cause reordering<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l3 level2 lfo4">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">b.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">It is quite possible to P2MP LSPs as the P-tunneling technolog=
y delivery of BUM traffic in EVPN while using MP2P LSPs for carrying known =
unicast traffic<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l3 level2 lfo4">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">c.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><b><span style=3D"color:#1F497D;mso-fareast-=
language:EN-US">The bottom line</span></b><span style=3D"color:#1F497D;mso-=
fareast-language:EN-US">: RFC 7432 defines the &nbsp;scenario when the CW S=
HOULD be used in the EVPN encapsulation of
 the known unicast traffic but SHOULD NOT be used in the EVPN encapsulation=
 of BUM traffic as valid<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l3 leve=
l1 lfo4"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-lang=
uage:EN-US"><span style=3D"mso-list:Ignore">2.<span style=3D"font:7.0pt &qu=
ot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">I am aware (this information is publicly available) of at leas=
t one deployed EVPN implementation that:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l3 level2 lfo4">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">a.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">By default includes the CW in the EVPN encapsulation of known =
unicast traffic (this default behavior can be disabled by explicit configur=
ation)<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l3 level2 lfo4">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">b.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">Does not include the CW in the EVPN encapsulation of BUM traff=
ic, presumably due to limitations imposed by the forwarding HW.<o:p></o:p><=
/span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l3 level2 lfo4">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">c.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><b><span style=3D"color:#1F497D;mso-fareast-=
language:EN-US">The bottom line</span></b><span style=3D"color:#1F497D;mso-=
fareast-language:EN-US">: inconsistent usage of CW in the EVPN encapsulatio=
n within the same EVI (with differences
 between known unicast and BUM traffic) is already a fact on the ground (at=
 least, to some extent).<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">My 2c,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ec=
itele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Yutianpeng (Tim) [<a href=3D"mailto:yut=
ianpeng@huawei.com">mailto:yutianpeng@huawei.com</a>]
<br>
<b>Sent:</b> Tuesday, October 23, 2018 5:48 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein@=
ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;; Wanghaibo (Rainsword=
) &lt;<a href=3D"mailto:rainsword.wang@huawei.com">rainsword.wang@huawei.co=
m</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@ietf=
.org">draft-wang-bess-evpn-control-word.authors@ietf.org</a>;
<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a><br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-word=
<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi Sasha,<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I am also thinking of =
this recently but haven=A1=AFt talked with author yet.<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">What was in my mind th=
e solution is actually simple: directly tear down (part of) the mac-VRF or =
EVI directly if CW capabilities not consistent, considering behavior in one=
 EVI should keep consistent (personally
 believe). &nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I might tend to the me=
chanism as below:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">If router A has CW cap=
abilities and receive type 1 or type 2 routes without CW, then A should dro=
p these routes and report an alarm.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">If router A does not h=
as CW capabilities and receive type 1 or type 2 routes with CW, then A shou=
ld drop these routes and report an alarm.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I believe the behavior=
 within EVI or Mac-VRF should keep consistent, otherwise, more questions wi=
ll pop out.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Considering if a servi=
ce is sensitive to packet misordering and it is ELAN, I tend to keep behavi=
or within this ELAN consistent.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">There could also be ot=
her problems with this approach, just share an idea so far open the discuss=
ion.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Regards, and lots of thanks in advance,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Tim<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> BESS [<a href=3D"mailto:bess-bounces@ie=
tf.org">mailto:bess-bounces@ietf.org</a>]
<b>On Behalf Of </b>Alexander Vainshtein<br>
<b>Sent:</b> 23 October 2018 14:42<br>
<b>To:</b> Wanghaibo (Rainsword) &lt;<a href=3D"mailto:rainsword.wang@huawe=
i.com">rainsword.wang@huawei.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@ietf=
.org">draft-wang-bess-evpn-control-word.authors@ietf.org</a>;
<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a><br>
<b>Subject:</b> Re: [bess] A question regarding draft-wang-bess-evepn-contr=
ol-word<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Dear Haibo,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Again,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Lots of thanks for a prompt response.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">My reading of your response is as following:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo6"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-lang=
uage:EN-US"><span style=3D"mso-list:Ignore">1.<span style=3D"font:7.0pt &qu=
ot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">All egress PEs can receive EVPN-encapsulated packets
<b><i>without the CW</i></b><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo6"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-lang=
uage:EN-US"><span style=3D"mso-list:Ignore">2.<span style=3D"font:7.0pt &qu=
ot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">All ingress PEs can sent EVPN-encapsulated packets
<b><i>without the CW</i></b><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo6"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-lang=
uage:EN-US"><span style=3D"mso-list:Ignore">3.<span style=3D"font:7.0pt &qu=
ot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">An egress PE that can receive EVPN-encapsulated packets with t=
he CW in the EVPN encapsulation, &nbsp;must add the appropriate NH Capabili=
ty attribute that indicates the CW-indicating
 label value (explicitly or implicitly) to all relevant EVPN routes. &nbsp;=
This includes:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l0 level2 lfo6">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">a.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">Per-EVI Ethernet A-D route (EVPN Route Type 1). In this case t=
he CWI label would follow the label advertised in the NLRI of this route<o:=
p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l0 level2 lfo6">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">b.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">MAC/IP Advertisement route (EVPN Type 2 route). In this case t=
he CWI label would follow the label advertised in the NLRI as Label1, it wo=
uld not be relevant for packets that
 are encapsulated using Label2 (used with the Symmetric EVPN IRB).<o:p></o:=
p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo6"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-lang=
uage:EN-US"><span style=3D"mso-list:Ignore">4.<span style=3D"font:7.0pt &qu=
ot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">An ingress PE that has received an EVPN route with the CW capa=
bility attribute wand that can support usage of CW in the EVPN encapsulatio=
n, will insert both the CWI advertised
 in the CW capability attribute, and the CW in the EVPN packets it sends to=
 the corresponding egress PE.&nbsp; If it does not support usage of CW in t=
he encapsulation, it will not insert this label.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Is this understanding correct?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">If yes, I still have a couple of questions:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.7pt;text-indent:-18.0=
pt;mso-list:l1 level1 lfo8">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">1.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">Suppose that you use ingress replication (IR) to deliver BUM t=
raffic across EVPN. The Ingress Replication label would be advertised in th=
e PTA attribute of the Inclusive Multicast
 Ethernet Tag Route (EVPN Type 3 route); it will not be part of the NLRI. D=
o you expect the same logic to be used with regard to CW capabilities and C=
WI label advertisement applied also to these routes?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.7pt;text-indent:-18.0=
pt;mso-list:l1 level1 lfo8">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-U=
S"><span style=3D"mso-list:Ignore">2.<span style=3D"font:7.0pt &quot;Times =
New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span style=3D"color:#1F497D;mso-fareast-lan=
guage:EN-US">Per-ES Ethernet A-D Routes are advertised with the ECI expende=
d Community that carries within the so-called ESI label. This label is incl=
uded the EVPN encapsulation of BUM
 packets sent to the PE that is attached to the same multi-homed ES from wh=
ich the original ES packet has been received. Do you expect the same logic =
to be used with regard to CW capabilities and CWI label advertisement appli=
ed also to these routes with the
 CWI label following the ESI label in the EVPN encapsulation of BUM packets=
?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Regards, and lots of thanks in advance,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ec=
itele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Wanghaibo (Rainsword) [<a href=3D"mailt=
o:rainsword.wang@huawei.com">mailto:rainsword.wang@huawei.com</a>]
<br>
<b>Sent:</b> Tuesday, October 23, 2018 2:34 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein@=
ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; <a href=3D"m=
ailto:draft-wang-bess-evpn-control-word.authors@ietf.org">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-word=
<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Hi Alexander,<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The solution here is=
 to carry the next hop capability attribute when the route is advertised. T=
he capability carried here is the control word capability.<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The specific format =
of the next hop capability can be referred to the draft.:
<b>&lt;draft-ietf-idr-next-hop-capability&gt;<o:p></o:p></b></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | Capability Code (2 octets)&nbsp;&nbsp; |<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | Capability Length (2 octets) |<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | Capability Value (variable)&nbsp; |<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; ~&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ~<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">For the control word=
 capability , it may encode as :<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | CW Capabality Type (TBD)&nbsp; &nbsp;&nbsp;&nbsp;|<o:p></=
o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | CW Length (0 or 3) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | CWI Label (may not exist) &nbsp;&nbsp;&nbsp;|<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">CWI (Control word in=
dication)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">And the forwarding P=
acket example.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&#43;------------------------------&#43;<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | Tunnel Label &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | EVI Label&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
 &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></=
o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | CW Indicate Label &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; | Control word&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-siz=
e:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The difference betwe=
en the two methods is that which value should be use for the control word c=
apability indicates label.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Method 1, use reserv=
ed label, which should be assigned by IANA, (such as the entropy label, whi=
ch is the value of 7)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">If we use this metho=
d, then the control word capability attribute<span lang=3D"ZH-CN">=A1=AF</s=
pan>s CW length use 0 is enough.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">And the forwarding p=
acket use the IANA specified value as the CWI (Control word indication) Lab=
el .(Perhaps 8 or others)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Method2, use normal =
value, which is assigned by router.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">If we use this metho=
d, then the router must assign a label used for the CWI. Perhaps label. And=
 the control word capability attribute<span lang=3D"ZH-CN">=A1=AF</span>s C=
W
 length must be 3 and must contain the value in the update message.<o:p></o=
:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The forwarding packe=
t must use that value as the CWI label.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Regards,<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Haibo<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein [<a href=3D"mailto=
:Alexander.Vainshtein@ecitele.com">mailto:Alexander.Vainshtein@ecitele.com<=
/a>]
<br>
<b>Sent:</b> Tuesday, October 23, 2018 6:09 PM<br>
<b>To:</b> Wanghaibo (Rainsword) &lt;<a href=3D"mailto:rainsword.wang@huawe=
i.com">rainsword.wang@huawei.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; <a href=3D"m=
ailto:draft-wang-bess-evpn-control-word.authors@ietf.org">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-word=
<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Dear Haibo,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Lots of thanks for an extra-prompt response to my question.<o:p></o:p>=
</span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">There may be some misunderstanding here.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">The draft says (the important text is highlighted):<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;There are
<span style=3D"background:yellow;mso-highlight:yellow">two methods</span> t=
o specified the control word indicator label:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The first method is to apply=
 for a reserved label to indicate<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;whether the packet contains =
a control word;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The second method is to
<span style=3D"background:yellow;mso-highlight:yellow">apply for a new labe=
l</span> when the sending<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; router advertises the contro=
l word capability,
<span style=3D"background:yellow;mso-highlight:yellow">which is used to<o:p=
></o:p></span></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;background:y=
ellow;mso-highlight:yellow;mso-fareast-language:EN-US">&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; indicate whether the control word is included in the packet</spa=
n><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Courier New=
&quot;;mso-fareast-language:EN-US">.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">My question referred just to the 2<sup>nd</sup> method, while your res=
ponse seems to deal with the 1<sup>st</sup> one.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Did I miss something?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ec=
itele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:EN=
-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> BESS [<a href=3D"mailto:bess-bounces@ie=
tf.org">mailto:bess-bounces@ietf.org</a>]
<b>On Behalf Of </b>Wanghaibo (Rainsword)<br>
<b>Sent:</b> Tuesday, October 23, 2018 12:03 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein@=
ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;;
<a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@ietf.org">draft=
-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a><br>
<b>Subject:</b> [bess] <span lang=3D"ZH-CN" style=3D"font-family:SimSun">=
=B4=F0=B8=B4</span>: A question regarding draft-wang-bess-evepn-control-wor=
d<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Hi Alexander,<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The number of routes=
 advertised by the Sender router in our solution will not change, but only =
carries a next hop capability attribute with control word capability<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The Receiver router =
determines whether to carry the control word when forwarding packets accord=
ing to its own capabilities.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The following figure=
 is an example.:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">PE1----------PE2<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:10.5pt"><span style=3D"font-siz=
e:10.5pt;font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:=
black">|-----------PE3<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">When PE1 advertises =
a route, it carries the next hop attribute of the control word capability. =
The routes received by PE2 and PE3 are the same.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">If &nbsp;PE2 do not =
support the control word, it will not carry the control word when forwardin=
g packets to PE1.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">PE1 cannot find the =
control word indication label when parsing the PE2 packet. PE1 will treat t=
he packet as normal.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">If &nbsp;PE3 support=
 the control word, it can add a control word when forwarding the packet to =
the PE1, and add the control word indication label specified by the PE1.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">When the PE1 receive=
s the packet and finds the control word indication label in the packet. PE1=
 will correctly process the control word.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Thanks<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Haibo<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></s=
pan></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"ZH-CN" style=3D"font-family:&quot;=
=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif">=B7=A2=BC=FE=C8=CB</span></b><b>=
<span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif"=
>:</span></b><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot=
;,sans-serif"> Alexander Vainshtein [<a href=3D"mailto:Alexander.Vainshtein=
@ecitele.com">mailto:Alexander.Vainshtein@ecitele.com</a>]
<br>
<b><span lang=3D"ZH-CN">=B7=A2=CB=CD=CA=B1=BC=E4</span>:</b> 2018<span lang=
=3D"ZH-CN">=C4=EA</span>10<span lang=3D"ZH-CN">=D4=C2</span>23<span lang=3D=
"ZH-CN">=C8=D5</span> 16:46<br>
<b><span lang=3D"ZH-CN">=CA=D5=BC=FE=C8=CB</span>:</b> <a href=3D"mailto:dr=
aft-wang-bess-evpn-control-word.authors@ietf.org">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b><span lang=3D"ZH-CN">=B3=AD=CB=CD</span>:</b> <a href=3D"mailto:bess@iet=
f.org">bess@ietf.org</a><br>
<b><span lang=3D"ZH-CN">=D6=F7=CC=E2</span>:</b> A question regarding draft=
-wang-bess-evepn-control-word<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Dear authors of <a href=3D"https://tools.ietf.org/ht=
ml/draft-wang-bess-evpn-control-word-00">
draft-wang-bess-evpn-control-word</a>,<o:p></o:p></p>
<p class=3D"MsoNormal">I have doubts regarding at least one of the approach=
es for negotiating the CW usage in the EVPN encapsulation between egress an=
d ingress PE that is defined in the draft.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">In the case when the egress PE can receive EVPN-enca=
psulated packets both with and without CW, the draft seems to propose (as o=
ne of the possibilities) advertisement of two EVPN routes for each ES or MA=
C/IP pair:<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l4 leve=
l1 lfo10">
<![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=3D"font:7=
.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;
</span></span><![endif]>One of these routes would use the CW Capability to =
indicate that it refers to the EVPN encapsulation that uses the CW, and wou=
ld carry the appropriate label in its NLRI<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l4 leve=
l1 lfo10">
<![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=3D"font:7=
.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;
</span></span><![endif]>The other route would not use the CW Capability to =
indicate that it refers to the EVPN encapsulation that does not use the CW,=
 and carry a different label in its NLRI<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The ingress PE that accepts these routes would then =
use one of them based on its own ability to use the CW (or lack thereof), a=
nd use the corresponding label it its EVPN encapsulation, while &nbsp;the D=
P in the egress PW would infer presence
 or absence of the CW from the received EVPN application label.<o:p></o:p><=
/p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Unfortunately, I do not think that this can work bec=
ause, as per
<a href=3D"https://tools.ietf.org/html/rfc7432">RFC 7432</a>, labels in the=
 labeled NLRI of EVPN routes are not part of the route key for the purpose =
of the BGP route key processing, while the label is treated just as the BGP=
 attribute. This means that, unless
 some form of BGP multi-path is enabled in the ingress PE (and in all RRs o=
n the way between the egress PE and ingress PE) for the L2VPN/EVPN &nbsp;AF=
I/SAFI, only one of these routes will be selected by the BGP selection proc=
ess.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Did I miss something substantial here?<o:p></o:p></p=
>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p></=
p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Office: &#43;972-39266302<o:p></o:p></p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-5492663=
02<o:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; <a href=3D"mailto:Alexander.Vains=
htein@ecitele.com">Alexander.Vainshtein@ecitele.com</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ti=
mes New Roman&quot;,serif"><br>
___________________________________________________________________________=
<br>
<br>
This e-mail message is intended for the recipient only and contains informa=
tion which is
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CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have recei=
ved this
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transmission in error, please inform us by e-mail, phone or fax, and then d=
elete the original
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<br>
___________________________________________________________________________=
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<br>
This e-mail message is intended for the recipient only and contains informa=
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This e-mail message is intended for the recipient only and contains informa=
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___________________________________________________________________________=
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This e-mail message is intended for the recipient only and contains informa=
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--_000_35FF0D51C8DAB54B95B0426331F984FF520881C4lhreml523mbxchi_--


From nobody Wed Oct 24 14:02:31 2018
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From: Ben Campbell <ben@nostrum.com>
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Subject: [bess] Ben Campbell's No Objection on draft-ietf-bess-mvpn-expl-track-12: (with COMMENT)
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Ben Campbell has entered the following ballot position for
draft-ietf-bess-mvpn-expl-track-12: No Objection

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

Thanks for the work on this!

*** Substantive Comments ***

I support Mirja's DISCUSS.

- There is an IPR disclosure with possible royalties. The shepherd report says
there were no WG objections. How was the disclosure communicated? For example,
was the WG reminded of the disclosure at WGLC?

*** Editorial Comments ***

§3:
- Part way through the section, starting with "We also introduce a new notion,
the "match for tracking":", there is a section of text that has a significantly
different tone from the rest of the draft. It switches more of a lecture style,
then switches back. I suggest an edit pass to keep a consistent tone.  (I know
this is a question of style, and I will not press it further if people prefer
not to change it.)

- 2 paragraphs starting with "For a given C-flow..."
Why is this indented?



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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/ujZagG9PK_sdX3AoBCdItP2WWxk>
Subject: Re: [bess] Ben Campbell's No Objection on draft-ietf-bess-mvpn-expl-track-12: (with COMMENT)
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From nobody Wed Oct 24 16:01:27 2018
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Date: Wed, 24 Oct 2018 18:01:20 -0500
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Cc: The IESG <iesg@ietf.org>, "draft-ietf-bess-mvpn-expl-track@ietf.org" <draft-ietf-bess-mvpn-expl-track@ietf.org>,  "stephane.litkowski@orange.com" <stephane.litkowski@orange.com>, "bess-chairs@ietf.org" <bess-chairs@ietf.org>, "bess@ietf.org" <bess@ietf.org>
To: "Vigoureux, Martin (Nokia - FR/Paris-Saclay)" <martin.vigoureux@nokia.com>
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Subject: Re: [bess] Ben Campbell's No Objection on draft-ietf-bess-mvpn-expl-track-12: (with COMMENT)
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Excellent, thanks!

> On Oct 24, 2018, at 4:29 PM, Vigoureux, Martin (Nokia - =
FR/Paris-Saclay) <martin.vigoureux@nokia.com> wrote:
>=20
> Ben,
>=20
> thank you for your review.
> Regarding your substantive COMMENT: the disclosure came at the time of
> WG adoption. The WG was thus specifically informed of that and given =
an
> extra week to (re)consider the positions already expressed.
>=20
> The existence of the IPR was also mentioned and referenced in the WG
> Last Call e-mail.
>=20
> -m
>=20
> Le 2018-10-24 =C3=A0 23:02, Ben Campbell a =C3=A9crit :
>> Ben Campbell has entered the following ballot position for
>> draft-ietf-bess-mvpn-expl-track-12: No Objection
>>=20
>> When responding, please keep the subject line intact and reply to all
>> email addresses included in the To and CC lines. (Feel free to cut =
this
>> introductory paragraph, however.)
>>=20
>>=20
>> Please refer to =
https://www.ietf.org/iesg/statement/discuss-criteria.html
>> for more information about IESG DISCUSS and COMMENT positions.
>>=20
>>=20
>> The document, along with other ballot positions, can be found here:
>> https://datatracker.ietf.org/doc/draft-ietf-bess-mvpn-expl-track/
>>=20
>>=20
>>=20
>> =
----------------------------------------------------------------------
>> COMMENT:
>> =
----------------------------------------------------------------------
>>=20
>> Thanks for the work on this!
>>=20
>> *** Substantive Comments ***
>>=20
>> I support Mirja's DISCUSS.
>>=20
>> - There is an IPR disclosure with possible royalties. The shepherd =
report says
>> there were no WG objections. How was the disclosure communicated? For =
example,
>> was the WG reminded of the disclosure at WGLC?
>>=20
>> *** Editorial Comments ***
>>=20
>> =C2=A73:
>> - Part way through the section, starting with "We also introduce a =
new notion,
>> the "match for tracking":", there is a section of text that has a =
significantly
>> different tone from the rest of the draft. It switches more of a =
lecture style,
>> then switches back. I suggest an edit pass to keep a consistent tone. =
 (I know
>> this is a question of style, and I will not press it further if =
people prefer
>> not to change it.)
>>=20
>> - 2 paragraphs starting with "For a given C-flow..."
>> Why is this indented?
>>=20
>>=20
>> _______________________________________________
>> BESS mailing list
>> BESS@ietf.org
>> https://www.ietf.org/mailman/listinfo/bess
>>=20


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From nobody Wed Oct 24 19:14:04 2018
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From: Spencer Dawkins <spencerdawkins.ietf@gmail.com>
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Subject: [bess] Spencer Dawkins' No Objection on draft-ietf-bess-mvpn-expl-track-12: (with COMMENT)
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Spencer Dawkins has entered the following ballot position for
draft-ietf-bess-mvpn-expl-track-12: No Objection

When responding, please keep the subject line intact and reply to all
email addresses included in the To and CC lines. (Feel free to cut this
introductory paragraph, however.)


Please refer to https://www.ietf.org/iesg/statement/discuss-criteria.html
for more information about IESG DISCUSS and COMMENT positions.


The document, along with other ballot positions, can be found here:
https://datatracker.ietf.org/doc/draft-ietf-bess-mvpn-expl-track/



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

Keeping in mind that reading multicast specifications now is like reading the
denser MPLS specifications 10-15 years ago, even with the forest of unfamiliar
terms in the Introduction, you manage to explain clearly what the problems
being addressed are. Thank you for that effort.

I support Mirja's Discuss, specifically because if this ever goes wrong, the
people writing this spec probably know the most about what to do about it. If
you can provide guidance, it will probably be better guidance than operators
will get from anyone else.

(And please take this as a compliment!)



From nobody Wed Oct 24 20:05:44 2018
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DISCUSS:
----------------------------------------------------------------------

* Section 5.2.

In the NLRI format it is not clear what the length of the "Ingress PE's IP
address" field is supposed to be. i.e. what address families does it support
and how do we determine what sort of address follows since there is no length
field in front.





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

I have some non-blocking comments:

(1) §3:

   The rules for finding a "match for reception" in [RFC6625] are hereby
   modified as follows:

      When applying the rules of Section 3.2.1 or 3.2.2 of [RFC6625], it
      is REQUIRED to ignore any S-PMSI A-D route that has no PTA, or
      whose PTA specifies "no tunnel information present".

   There are other RFCs that update [RFC6625] and that modify the rules
   for finding a "match for reception".  See, e.g., [RFC7582] and
   [RFC7900].  When applying those modified rules, it is REQUIRED to
   ignore any S-PMSI A-D route that has no PTA, or whose PTA specifies
   "no tunnel information present".

This text is also Updating rfc7582 and rfc7900 (and others?) that Updated
rfc6625.  This document should then be marked to Update those other RFCs
explicitly.

(2) How is this phrase intended to be interpreted: "the following procedure can
be used if and only if it is known that the egress nodes support the optional
LIR-pF flag" (§4)?  I ask because, even though there's no rfc2119 language, I
would be inclined to interpret "if and only if" as an absolute requirement:
just like a MUST.  However, later in the same section there is normative
language that doesn't seem to match: "this procedure...if there are egress
nodes that do not support the LIR-pF flag, and hence SHOULD NOT be used in that
case."  I think that, in the best case, there may be some confusion in the text
-- it would be good to clarify by maybe not using an expression as absolute as
"if and only if".

(3) §5.1, Case 3: "...LIR-pF is set.  The egress node MUST follow whatever
procedures are required by other specifications, based on the match for
reception.  If the egress node supports the LIR-pF flag, it MUST also follow
the procedures of Section 5.2."

The text above seems to account for the case where the egress node doesn't
support the LIR-pF flag in the first sentence quoted.  However, if the node
doesn't support the flag, it can't be assumed that it has knowledge of this
document...which means that we shouldn't use normative language to instruct
those nodes to do anything.  Also, the specification of "whatever procedures
are required by other specifications" is too vague for being normative. 
s/MUST/must

(4) §2: s/Since an ingress node that sets the LIR-pF flag is also REQUIRED to
set the LIR flag,/Since an ingress node that sets the LIR-pF flag is also
required to set the LIR flag,

The normative behavior is already specified above ("If the LIR-pF flag is set
in the PTA of an S-PMSI A-D route, the LIR flag of that PTA MUST also be set").
 I know that MUST = REQUIRED, but in this case the sentence is just stating a
fact.



From nobody Wed Oct 24 23:34:26 2018
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----------------------------------------------------------------------
COMMENT:
----------------------------------------------------------------------


Thanks for the work everyone did on this document.

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

Please expand the following acronyms upon first use and in the abstract;
see https://www.rfc-editor.org/materials/abbrev.expansion.txt for guidance.

 - MVPN - Multicast VPN
 - I-PMSI - ???
 - P2MP - Point-to-Multipoint



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Subject: Re: [bess] A question regarding draft-wang-bess-evepn-control-word
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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Tim and all,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">From my POV we definitely should not encourage non-usage of CW in EV=
PN encapsulation
<b><i>where it can be used</i></b>.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">But we also should not exclude
<b>existing equipment that does not support usage of CW in EVPN encapsulat=
ion</b> from being interoperable with equipment that supports usage of the=
 CW. &nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">The difference between these two requirements is, IMHO, as following=
:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Standards we develop can
<b><i>guarantee</i></b> the interoperability and <b><i>promote</i></b> usa=
ge of the CW. But they &nbsp;cannot provide a 100% fool-proof solution =A8=
C not in this specific case and not in any other case.<o:p></o:p></span></=
p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">My 2c,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Email:&nbsp;&nbsp; Alexander.Vainshtein@ecitele.com<o:p></o:p></span=
></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Yutianpeng (Tim) [mailto:yutianpeng@hu=
awei.com]
<br>
<b>Sent:</b> Wednesday, October 24, 2018 9:40 PM<br>
<b>To:</b> Alexander Vainshtein &lt;Alexander.Vainshtein@ecitele.com&gt;; =
Wanghaibo (Rainsword) &lt;rainsword.wang@huawei.com&gt;<br>
<b>Cc:</b> draft-wang-bess-evpn-control-word.authors@ietf.org; bess@ietf.o=
rg<br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-wor=
d<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi,<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">My concern is if we s=
hould encourage the behavior that CW enabled PE can communicate with CW di=
sabled PE.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Let=A1=AFs assume sce=
nario below: <o:p>
</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">A, B and C are in the=
 same EVI. A and C enable CW and B disable CW.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">A(CW)---- B(CW Disabl=
ed)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">|&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp; /<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">|&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp; /<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">|&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; /<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">C (CW)<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Question 1: As we kno=
w CW is to disable ECMP to for services sensitive to packet misordering. D=
o we have a kind of ELAN service misordering sensitive between A&lt;-&gt;C=
 but not A&lt;-&gt;B? &nbsp;Even yes, can we disable ECMP
 for whole EVI instead of enabling ECMP on a particular path.<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Question 2: If a mech=
anism allowing communication between A&lt;-&gt;B and C&lt;-&gt;B, even B i=
s misconfigured, everything will still work without any notice but service=
 is disrupted (misordering A-&gt;B and C-&gt;B happens).
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">In PW or even VPLS, n=
egotiation will not succeed if CW capability on both ends is not same.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Then in EVPN, I am th=
inking we should use a direct decision similar to PW, or obscure one enabl=
es communication between CW and CW disabled.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">My approach is after =
negotiation, only A&lt;-&gt;C communicates, but A&lt;-&gt;B C&lt;-&gt;B ca=
nnot communicate until B enables CW as it very likely leads to services di=
sruption.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Then designers and ma=
intenance have a clear idea of whether each ELAN is misordering sensitive =
or not.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">In case there are oth=
er services not sensitive to misordering, we can have a new EVI and put it=
 in other VLANs.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Thanks,<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Tim<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein [<a href=3D"mailt=
o:Alexander.Vainshtein@ecitele.com">mailto:Alexander.Vainshtein@ecitele.co=
m</a>]
<br>
<b>Sent:</b> 24 October 2018 16:57<br>
<b>To:</b> Yutianpeng (Tim) &lt;<a href=3D"mailto:yutianpeng@huawei.com">y=
utianpeng@huawei.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@iet=
f.org">draft-wang-bess-evpn-control-word.authors@ietf.org</a>;
<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; Wanghaibo (Rainsword) =
&lt;<a href=3D"mailto:rainsword.wang@huawei.com">rainsword.wang@huawei.com=
</a>&gt;<br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-wor=
d<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Tim,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Lots of thanks for your email, it really clarifies your approach.<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Regarding your proposal to =A1=B0isolate=A1=B1 PEs that do not suppo=
rt the CW - I suspect this is not practical.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">EVPN-MPLS implementations are not REQUIRED to support usage of CW. S=
ome EVPN-MPLS implementations that I am aware of explicitly state that the=
 CW usage can be disabled for interoperability
 with other vendors, so I think that there EVPN implementations that do no=
t support the CW have been deployed.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<pre><span style=3D"color:#1F497D;mso-fareast-language:EN-US"><a href=3D"h=
ttps://tools.ietf.org/html/draft-ietf-pals-ethernet-cw-07">draft-ietf-pals=
-ethernet-cw</a> (already in the RFC Editor queue in the AUTH48 state) say=
s that =A1=B0</span><span style=3D"font-size:10.0pt;font-family:&quot;Cour=
ier New&quot;;color:black;background:yellow;mso-highlight:yellow;mso-farea=
st-language:EN-US">where both the ingress PE and the egress PE support the=
 Ethernet pseudowire control word</span><span style=3D"font-size:10.0pt;fo=
nt-family:&quot;Courier New&quot;;color:black;mso-fareast-language:EN-US">=
, then the CW MUST be used</span><span style=3D"color:#1F497D;mso-fareast-=
language:EN-US">=A1=B1. <o:p></o:p></span></pre>
<pre><span style=3D"color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp;<=
/o:p></span></pre>
<pre><span style=3D"color:#1F497D;mso-fareast-language:EN-US">Personally I=
 think that this sets the goal that we should achieve in EVPN as well:<o:p=
></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-list:l2 level1 lf=
o2"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language=
:EN-US"><span style=3D"mso-list:Ignore">1.<span style=3D"font:7.0pt &quot;=
Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span>=
</span><![endif]><span dir=3D"LTR"></span><span style=3D"color:#1F497D;mso=
-fareast-language:EN-US">All EVPN-MPLS implementations MUST support EVPN e=
ncapsulations without the CW<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-list:l2 level1 lf=
o2"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language=
:EN-US"><span style=3D"mso-list:Ignore">2.<span style=3D"font:7.0pt &quot;=
Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span>=
</span><![endif]><span dir=3D"LTR"></span><span style=3D"color:#1F497D;mso=
-fareast-language:EN-US">An egress PE SHOULD indicate, <span style=3D"back=
ground:yellow;mso-highlight:yellow">per each L2VPN/EVPN route it advertise=
s</span>, whether it can handle received CW in the EVPN encapsulation for =
packets that are sent to it based on this route by ingress PEs, or not, an=
d, if it can, how the presence of the CW is indicated. &nbsp;This can be d=
one using the CW Next-Hop Capability and the CWI label as explained in the=
 draft<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-list:l2 level1 lf=
o2"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language=
:EN-US"><span style=3D"mso-list:Ignore">3.<span style=3D"font:7.0pt &quot;=
Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span>=
</span><![endif]><span dir=3D"LTR"></span><span style=3D"color:#1F497D;mso=
-fareast-language:EN-US">An ingress PE that accepts a L2VPN/EVPN route wit=
h the CW next Hop Capability, MUST insert the CW and indicate its presence=
, <b><i>if it supports CWI and CW insertion in the appropriate EVPN encaps=
ulation</i></b>. Please note that the ability to insert CWI and CW may dif=
fer for different L2VPN/EVPN routes. E.g.. the same PE can:<o:p></o:p></sp=
an></pre>
<pre style=3D"margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level2 lf=
o2"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language=
:EN-US"><span style=3D"mso-list:Ignore">a.<span style=3D"font:7.0pt &quot;=
Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span>=
</span><![endif]><span dir=3D"LTR"></span><span style=3D"color:#1F497D;mso=
-fareast-language:EN-US">Support the CWI and CW insertion in the EVPN enca=
psulation of =A1=B0known unicast=A1=B1 frames and BUM frames if their enca=
psulation does not require insertion of the ESI label<o:p></o:p></span></p=
re>
<pre style=3D"margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level2 lf=
o2"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language=
:EN-US"><span style=3D"mso-list:Ignore">b.<span style=3D"font:7.0pt &quot;=
Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span>=
</span><![endif]><span dir=3D"LTR"></span><span style=3D"color:#1F497D;mso=
-fareast-language:EN-US">Not support CWI and CW insertion in the EVPN enca=
psulation of BUM frames if this inclusion of the ESI label in their encaps=
ulation is required.<o:p></o:p></span></pre>
<pre><span style=3D"color:#1F497D;mso-fareast-language:EN-US"><o:p>&nbsp;<=
/o:p></span></pre>
<pre><span style=3D"color:#1F497D;mso-fareast-language:EN-US">This approac=
h would &nbsp;meet with the old IETF design principle: =A1=B0Be strict in =
what you transmit and liberal in what you receive=A1=B1.<o:p></o:p></span>=
</pre>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Hope this helps.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">My 2c,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@e=
citele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Yutianpeng (Tim) [<a href=3D"mailto:yu=
tianpeng@huawei.com">mailto:yutianpeng@huawei.com</a>]
<br>
<b>Sent:</b> Wednesday, October 24, 2018 5:32 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein=
@ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@iet=
f.org">draft-wang-bess-evpn-control-word.authors@ietf.org</a>;
<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; Wanghaibo (Rainsword) =
&lt;<a href=3D"mailto:rainsword.wang@huawei.com">rainsword.wang@huawei.com=
</a>&gt;<br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-wor=
d<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi Sasha,<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Thanks a lot for your=
 advice.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I agree with you that=
 CW is not mandatory for all traffic, mainly unicast. This draft focuses o=
n CW capability advertisement and is applicable to traffic needs CW proces=
sing. &nbsp;So far BUM should be not relevant
 to this draft. (Multicast might need CW potentially we realize recently, =
but we will visit this topic later.)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Some clarification on=
 my proposal:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I believe we need a m=
echanism of negotiation on CW capabilities in EVPN ELAN. If you check PW o=
r EVPN VPWS there is a clear procedure on negotiation between two ends.<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Refer to: <a href=3D"=
https://tools.ietf.org/html/rfc4447#section-6">
<span style=3D"color:#1F497D;text-decoration:none">https://tools.ietf.org/=
html/rfc4447#section-6</span></a> and
<a name=3D"appendix-A"></a><a href=3D"https://tools.ietf.org/html/rfc4447#=
appendix-A"><span style=3D"color:#1F497D;text-decoration:none">Appendix A<=
/span></a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">But as EVPN is MP2MP,=
 in case of PE CW behavior can be different between PEs as there is no neg=
otiation at all at the moment.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">So this draft introdu=
ces CW capability which at least allows PEs within EVI knows the capabilit=
y of each other. It also defines behavior after receiving CW capabilities.=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">What I proposed is th=
e behavior in case CW capabilities across PEs are different. I mentioned a=
 simple way of tearing down or isolate CW disabled PEs and raise an alarm,=
 a bit similar to PW. The draft proposes
 a graceful way that traffic can be forwarded with a label advertised toge=
ther with CW capability, such that egress PE can indicate CW via the label=
 on the forwarding plane.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Happy for further dis=
cussion on this as CW of EVPN topic has been raised couple of times recent=
ly.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Thanks &amp; Regards,=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Tim<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein [<a href=3D"mailt=
o:Alexander.Vainshtein@ecitele.com">mailto:Alexander.Vainshtein@ecitele.co=
m</a>]
<br>
<b>Sent:</b> 24 October 2018 09:39<br>
<b>To:</b> Yutianpeng (Tim) &lt;<a href=3D"mailto:yutianpeng@huawei.com">y=
utianpeng@huawei.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@iet=
f.org">draft-wang-bess-evpn-control-word.authors@ietf.org</a>;
<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; Wanghaibo (Rainsword) =
&lt;<a href=3D"mailto:rainsword.wang@huawei.com">rainsword.wang@huawei.com=
</a>&gt;<br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-wor=
d<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Tim,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Lots of thanks for sharing your views.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Unfortunately, I doubt the approach that you propose: always use or =
do not use CW in the same EVI.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">The problem, as I see it is that known unicast and BUM traffic may b=
e handled differently when it comes to EVPN encapsulation:<o:p></o:p></spa=
n></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l3 lev=
el1 lfo4"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-la=
nguage:EN-US"><span style=3D"mso-list:Ignore">1.<span style=3D"font:7.0pt =
&quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">Section 18 of RFC 7432 explicitly s=
tates that =A1=B0When sending EVPN-encapsulated packets over a P2MP LSP or=
 P2P LSP, then the control word SHOULD NOT be
 used=A1=B1<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l3 level2 lfo4">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">a.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">This recommendation is quite reason=
able because the LSPs in question are not affected by ECMP, so there is no=
 need to use the CW to prevent ECMP-cause
 reordering<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l3 level2 lfo4">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">b.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">It is quite possible to P2MP LSPs a=
s the P-tunneling technology delivery of BUM traffic in EVPN while using M=
P2P LSPs for carrying known unicast traffic<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l3 level2 lfo4">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">c.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><b><span style=3D"=
color:#1F497D;mso-fareast-language:EN-US">The bottom line</span></b><span =
style=3D"color:#1F497D;mso-fareast-language:EN-US">: RFC 7432 defines the =
&nbsp;scenario when the CW SHOULD be used in the
 EVPN encapsulation of the known unicast traffic but SHOULD NOT be used in=
 the EVPN encapsulation of BUM traffic as valid<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l3 lev=
el1 lfo4"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-la=
nguage:EN-US"><span style=3D"mso-list:Ignore">2.<span style=3D"font:7.0pt =
&quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">I am aware (this information is pub=
licly available) of at least one deployed EVPN implementation that:<o:p></=
o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l3 level2 lfo4">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">a.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">By default includes the CW in the E=
VPN encapsulation of known unicast traffic (this default behavior can be d=
isabled by explicit configuration)<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l3 level2 lfo4">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">b.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">Does not include the CW in the EVPN=
 encapsulation of BUM traffic, presumably due to limitations imposed by th=
e forwarding HW.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l3 level2 lfo4">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">c.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><b><span style=3D"=
color:#1F497D;mso-fareast-language:EN-US">The bottom line</span></b><span =
style=3D"color:#1F497D;mso-fareast-language:EN-US">: inconsistent usage of=
 CW in the EVPN encapsulation within the
 same EVI (with differences between known unicast and BUM traffic) is alre=
ady a fact on the ground (at least, to some extent).<o:p></o:p></span></p>=

<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">My 2c,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@e=
citele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Yutianpeng (Tim) [<a href=3D"mailto:yu=
tianpeng@huawei.com">mailto:yutianpeng@huawei.com</a>]
<br>
<b>Sent:</b> Tuesday, October 23, 2018 5:48 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein=
@ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;; Wanghaibo (Rainswo=
rd) &lt;<a href=3D"mailto:rainsword.wang@huawei.com">rainsword.wang@huawei=
.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@iet=
f.org">draft-wang-bess-evpn-control-word.authors@ietf.org</a>;
<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a><br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-wor=
d<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Hi Sasha,<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I am also thinking of=
 this recently but haven=A1=AFt talked with author yet.<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">What was in my mind t=
he solution is actually simple: directly tear down (part of) the mac-VRF o=
r EVI directly if CW capabilities not consistent, considering behavior in =
one EVI should keep consistent (personally
 believe). &nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I might tend to the m=
echanism as below:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">If router A has CW ca=
pabilities and receive type 1 or type 2 routes without CW, then A should d=
rop these routes and report an alarm.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">If router A does not =
has CW capabilities and receive type 1 or type 2 routes with CW, then A sh=
ould drop these routes and report an alarm.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">I believe the behavio=
r within EVI or Mac-VRF should keep consistent, otherwise, more questions =
will pop out.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">Considering if a serv=
ice is sensitive to packet misordering and it is ELAN, I tend to keep beha=
vior within this ELAN consistent.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D">There could also be o=
ther problems with this approach, just share an idea so far open the discu=
ssion.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Regards, and lots of thanks in advance,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Tim<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></sp=
an></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> BESS [<a href=3D"mailto:bess-bounces@i=
etf.org">mailto:bess-bounces@ietf.org</a>]
<b>On Behalf Of </b>Alexander Vainshtein<br>
<b>Sent:</b> 23 October 2018 14:42<br>
<b>To:</b> Wanghaibo (Rainsword) &lt;<a href=3D"mailto:rainsword.wang@huaw=
ei.com">rainsword.wang@huawei.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@iet=
f.org">draft-wang-bess-evpn-control-word.authors@ietf.org</a>;
<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a><br>
<b>Subject:</b> Re: [bess] A question regarding draft-wang-bess-evepn-cont=
rol-word<o:p></o:p></p>
</div>
</div>
<p=20class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Dear Haibo,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Again,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Lots of thanks for a prompt response.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">My reading of your response is as following:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 lev=
el1 lfo6"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-la=
nguage:EN-US"><span style=3D"mso-list:Ignore">1.<span style=3D"font:7.0pt =
&quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">All egress PEs can receive EVPN-enc=
apsulated packets
<b><i>without the CW</i></b><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 lev=
el1 lfo6"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-la=
nguage:EN-US"><span style=3D"mso-list:Ignore">2.<span style=3D"font:7.0pt =
&quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">All ingress PEs can sent EVPN-encap=
sulated packets
<b><i>without the CW</i></b><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 lev=
el1 lfo6"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-la=
nguage:EN-US"><span style=3D"mso-list:Ignore">3.<span style=3D"font:7.0pt =
&quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">An egress PE that can receive EVPN-=
encapsulated packets with the CW in the EVPN encapsulation, &nbsp;must add=
 the appropriate NH Capability attribute that
 indicates the CW-indicating label value (explicitly or implicitly) to all=
 relevant EVPN routes. &nbsp;This includes:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l0 level2 lfo6">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">a.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">Per-EVI Ethernet A-D route (EVPN Ro=
ute Type 1). In this case the CWI label would follow the label advertised =
in the NLRI of this route<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.=
0pt;mso-list:l0 level2 lfo6">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">b.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">MAC/IP Advertisement route (EVPN Ty=
pe 2 route). In this case the CWI label would follow the label advertised =
in the NLRI as Label1, it would not be
 relevant for packets that are encapsulated using Label2 (used with the Sy=
mmetric EVPN IRB).<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 lev=
el1 lfo6"><![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-la=
nguage:EN-US"><span style=3D"mso-list:Ignore">4.<span style=3D"font:7.0pt =
&quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">An ingress PE that has received an =
EVPN route with the CW capability attribute wand that can support usage of=
 CW in the EVPN encapsulation, will insert
 both the CWI advertised in the CW capability attribute, and the CW in the=
 EVPN packets it sends to the corresponding egress PE.&nbsp; If it does no=
t support usage of CW in the encapsulation, it will not insert this label.=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Is this understanding correct?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">If yes, I still have a couple of questions:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.7pt;text-indent:-18.=
0pt;mso-list:l1 level1 lfo8">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">1.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">Suppose that you use ingress replic=
ation (IR) to deliver BUM traffic across EVPN. The Ingress Replication lab=
el would be advertised in the PTA attribute
 of the Inclusive Multicast Ethernet Tag Route (EVPN Type 3 route); it wil=
l not be part of the NLRI. Do you expect the same logic to be used with re=
gard to CW capabilities and CWI label advertisement applied also to these =
routes?<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.7pt;text-indent:-18.=
0pt;mso-list:l1 level1 lfo8">
<![if !supportLists]><span style=3D"color:#1F497D;mso-fareast-language:EN-=
US"><span style=3D"mso-list:Ignore">2.<span style=3D"font:7.0pt &quot;Time=
s New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span dir=3D"LTR"></span><span style=3D"col=
or:#1F497D;mso-fareast-language:EN-US">Per-ES Ethernet A-D Routes are adve=
rtised with the ECI expended Community that carries within the so-called E=
SI label.=20This label is included the EVPN
 encapsulation of BUM packets sent to the PE that is attached to the same =
multi-homed ES from which the original ES packet has been received. Do you=
 expect the same logic to be used with regard to CW capabilities and CWI l=
abel advertisement applied also to
 these routes with the CWI label following the ESI label in the EVPN encap=
sulation of BUM packets?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Regards, and lots of thanks in advance,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@e=
citele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Wanghaibo (Rainsword) [<a href=3D"mail=
to:rainsword.wang@huawei.com">mailto:rainsword.wang@huawei.com</a>]
<br>
<b>Sent:</b> Tuesday, October 23, 2018 2:34 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein=
@ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; <a href=3D"=
mailto:draft-wang-bess-evpn-control-word.authors@ietf.org">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-wor=
d<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Hi Alexander,<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The solution here is to carry=
 the next hop capability attribute when the route is advertised. The capab=
ility carried here is the control word capability.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The specific format of the ne=
xt hop capability can be referred to the draft.:
<b>&lt;draft-ietf-idr-next-hop-capability&gt;<o:p></o:p></b></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | Capability Code (2 octets)&nbsp;&nbsp; |<o:p></o:p></=
span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | Capability Length (2 octets) |<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | Capability Value (variable)&nbsp; |<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; ~&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ~<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">For the control word capabili=
ty , it may encode as :<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | CW Capabality Type (TBD)&nbsp; &nbsp;&nbsp;&nbsp;|<o:=
p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | CW Length (0 or 3) &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | CWI Label (may not exist) &nbsp;&nbsp;&nbsp;|<o:p></o=
:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">CWI (Control word indication)=
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">And the forwarding Packet exa=
mple.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&#43;------------------------------&#43;<o:p></o:p=
></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | Tunnel Label &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | EVI Label&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o=
:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | CW Indicate Label &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; | Control word&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span style=3D"font-si=
ze:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The difference between the tw=
o methods is that which value should be use for the control word capabilit=
y indicates label.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Method 1, use reserved label,=
 which should be assigned by IANA, (such as the entropy label, which is th=
e value of 7)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">If we use this method, then t=
he control word capability attribute<span lang=3D"ZH-CN">=A1=AF</span>s CW=
 length use 0 is enough.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">And the forwarding packet use=
 the IANA specified value as the CWI (Control word indication) Label .(Per=
haps 8 or others)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Method2, use normal value, wh=
ich is assigned by router.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">If we use this method, then t=
he router must assign a label used for the CWI. Perhaps label. And the con=
trol word capability attribute<span lang=3D"ZH-CN">=A1=AF</span>s
 CW length must be 3 and must contain the value in the update message.<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The forwarding packet must us=
e that value as the CWI label.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Regards,<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Haibo<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> Alexander Vainshtein [<a href=3D"mailt=
o:Alexander.Vainshtein@ecitele.com">mailto:Alexander.Vainshtein@ecitele.co=
m</a>]
<br>
<b>Sent:</b> Tuesday, October 23, 2018 6:09 PM<br>
<b>To:</b> Wanghaibo (Rainsword) &lt;<a href=3D"mailto:rainsword.wang@huaw=
ei.com">rainsword.wang@huawei.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; <a href=3D"=
mailto:draft-wang-bess-evpn-control-word.authors@ietf.org">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-wor=
d<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Dear Haibo,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Lots of thanks for an extra-prompt response to my question.<o:p></o:=
p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">There may be some misunderstanding here.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">The draft says (the important text is highlighted):<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US">&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;There are
<span style=3D"background:yellow;mso-highlight:yellow">two methods</span> =
to specified the control word indicator label:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The first method is to ap=
ply for a reserved label to indicate<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US">&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;whether the packet contai=
ns a control word;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The second method is to
<span style=3D"background:yellow;mso-highlight:yellow">apply for a new lab=
el</span> when the sending<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; router advertises the con=
trol word capability,
<span style=3D"background:yellow;mso-highlight:yellow">which is used to<o:=
p></o:p></span></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;background=
:yellow;mso-highlight:yellow;mso-fareast-language:EN-US">&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp; indicate whether the control word is included in the packet<=
/span><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Courie=
r New&quot;;mso-fareast-language:EN-US">.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN=
" style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareas=
t-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">My question referred just to the 2<sup>nd</sup> method, while your r=
esponse seems to deal with the 1<sup>st</sup> one.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Did I miss something?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@e=
citele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D;mso-fareast-language:E=
N-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> BESS [<a href=3D"mailto:bess-bounces@i=
etf.org">mailto:bess-bounces@ietf.org</a>]
<b>On Behalf Of </b>Wanghaibo (Rainsword)<br>
<b>Sent:</b> Tuesday, October 23, 2018 12:03 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein=
@ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;;
<a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@ietf.org">draf=
t-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a><br>
<b>Subject:</b> [bess] <span lang=3D"ZH-CN" style=3D"font-family:SimSun">=B4=
=F0=B8=B4</span>: A question regarding draft-wang-bess-evepn-control-word<=
o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Hi Alexander,<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The number of routes advertis=
ed by the Sender router in our solution will not change, but only carries =
a next hop capability attribute with control word
 capability<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The Receiver router determine=
s whether to carry the control word when forwarding packets according to i=
ts own capabilities.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">The following figure is an ex=
ample.:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">PE1----------PE2<o:p></o:p></=
span></p>
<p class=3D"MsoNormal" style=3D"text-indent:10.5pt"><span style=3D"font-si=
ze:10.5pt;font-family:&quot;Microsoft YaHei&quot;,sans-serif;color:black">=
|-----------PE3<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">When PE1 advertises a route, =
it carries the next hop attribute of the control word capability. The rout=
es received by PE2 and PE3 are the same.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">If &nbsp;PE2 do not support t=
he control word, it will not carry the control word when forwarding packet=
s to PE1.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">PE1 cannot find the control w=
ord indication label when parsing the PE2 packet. PE1 will treat the packe=
t as normal.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">If &nbsp;PE3 support the cont=
rol word, it can add a control word when forwarding the packet to the PE1,=
 and add the control word indication label specified by
 the PE1. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">When the PE1 receives the pac=
ket and finds the control word indication label in the packet. PE1 will co=
rrectly process the control word.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Thanks<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black">Haibo<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.5pt;font-family:&quot;M=
icrosoft YaHei&quot;,sans-serif;color:black"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm=
 0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"ZH-CN" style=3D"font-family:&quot;=
Microsoft YaHei&quot;,sans-serif">=B7=A2=BC=FE=C8=CB</span></b><b><span st=
yle=3D"font-family:&quot;Microsoft YaHei&quot;,sans-serif">:</span></b><sp=
an style=3D"font-family:&quot;Microsoft YaHei&quot;,sans-serif"> Alexander=
 Vainshtein [<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">mailto:Al=
exander.Vainshtein@ecitele.com</a>]
<br>
<b><span lang=3D"ZH-CN">=B7=A2=CB=CD=CA=B1=BC=E4</span>:</b> 2018<span lan=
g=3D"ZH-CN">=C4=EA</span>10<span lang=3D"ZH-CN">=D4=C2</span>23<span lang=3D=
"ZH-CN">=C8=D5</span> 16:46<br>
<b><span lang=3D"ZH-CN">=CA=D5=BC=FE=C8=CB</span>:</b> <a href=3D"mailto:d=
raft-wang-bess-evpn-control-word.authors@ietf.org">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b><span lang=3D"ZH-CN">=B3=AD=CB=CD</span>:</b> <a href=3D"mailto:bess@ie=
tf.org">bess@ietf.org</a><br>
<b><span lang=3D"ZH-CN">=D6=F7=CC=E2</span>:</b> A question regarding draf=
t-wang-bess-evepn-control-word<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Dear authors of <a href=3D"https://tools.ietf.org/h=
tml/draft-wang-bess-evpn-control-word-00">
draft-wang-bess-evpn-control-word</a>,<o:p></o:p></p>
<p class=3D"MsoNormal">I have doubts regarding at least one of the approac=
hes for negotiating the CW usage in the EVPN encapsulation between egress =
and ingress PE that is defined in the draft.<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">In the case when the egress PE can receive EVPN-enc=
apsulated packets both with and without CW, the draft seems to propose (as=
 one of the possibilities) advertisement of two EVPN routes for each ES or=
 MAC/IP pair:<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l5 lev=
el1 lfo10">
<![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=3D"font:=
7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;
</span></span><![endif]><span dir=3D"LTR"></span>One of these routes would=
 use the CW Capability to indicate that it refers to the EVPN encapsulatio=
n that uses the CW, and would carry the appropriate label in its NLRI<o:p>=
</o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l5 lev=
el1 lfo10">
<![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=3D"font:=
7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;
</span></span><![endif]><span dir=3D"LTR"></span>The other route would not=
 use the CW Capability to indicate that it refers to the EVPN encapsulatio=
n that does not use the CW, and carry a different label in its NLRI<o:p></=
o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">The ingress PE that accepts these routes would then=
 use one of them based on its own ability to use the CW (or lack thereof),=
 and use the corresponding label it its EVPN encapsulation, while &nbsp;th=
e DP in the egress PW would infer presence
 or absence of the CW from the received EVPN application label.<o:p></o:p>=
</p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Unfortunately, I do not think that this can work be=
cause, as per
<a href=3D"https://tools.ietf.org/html/rfc7432">RFC 7432</a>, labels in th=
e labeled NLRI of EVPN routes are not part of the route key for the purpos=
e of the BGP route key processing, while the label is treated just as the =
BGP attribute. This means that, unless
 some form of BGP multi-path is enabled in the ingress PE (and in all RRs =
on the way between the egress PE and ingress PE) for the L2VPN/EVPN &nbsp;=
AFI/SAFI, only one of these routes will be selected by the BGP selection p=
rocess.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Did I miss something substantial here?<o:p></o:p></=
p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Regards, and lots of thanks in advance,<o:p></o:p><=
/p>
<p class=3D"MsoNormal">Sasha<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">Office: &#43;972-39266302<o:p></o:p></p>
<p class=3D"MsoNormal">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266=
302<o:p></o:p></p>
<p class=3D"MsoNormal">Email:&nbsp;&nbsp; <a href=3D"mailto:Alexander.Vain=
shtein@ecitele.com">Alexander.Vainshtein@ecitele.com</a><o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;T=
imes New Roman&quot;,serif"><br>
__________________________________________________________________________=
_<br>
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From: "Vigoureux, Martin (Nokia - FR/Paris-Saclay)" <martin.vigoureux@nokia.com>
To: Suresh Krishnan <suresh@kaloom.com>, The IESG <iesg@ietf.org>
CC: "draft-ietf-bess-mvpn-expl-track@ietf.org" <draft-ietf-bess-mvpn-expl-track@ietf.org>, "stephane.litkowski@orange.com" <stephane.litkowski@orange.com>, "bess-chairs@ietf.org" <bess-chairs@ietf.org>, "bess@ietf.org" <bess@ietf.org>
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Date: Thu, 25 Oct 2018 08:31:56 +0000
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From: Suresh Krishnan <Suresh@kaloom.com>
To: "Vigoureux, Martin (Nokia - FR/Paris-Saclay)" <martin.vigoureux@nokia.com>
CC: The IESG <iesg@ietf.org>, "draft-ietf-bess-mvpn-expl-track@ietf.org" <draft-ietf-bess-mvpn-expl-track@ietf.org>, "stephane.litkowski@orange.com" <stephane.litkowski@orange.com>, "bess-chairs@ietf.org" <bess-chairs@ietf.org>, "bess@ietf.org" <bess@ietf.org>
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From: Alvaro Retana <aretana.ietf@gmail.com>
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--000000000000aec74a05790e7a8b
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Hi!

Protecting the control plane is a topic that is wider than this document=E2=
=80=A6or
even wider than =E2=80=9Cjust for BGP=E2=80=9D (as covered by rfc7454).  Ad=
ditional
recommendations are given in both rfc7454 and rfc6192 =E2=80=94 this docume=
nt
should then have a reference to them.

My 2c.

Alvaro.

On October 24, 2018 at 5:28:55 AM, Mirja K=C3=BChlewind (ietf@kuehlewind.ne=
t)
wrote:

----------------------------------------------------------------------
DISCUSS:
----------------------------------------------------------------------

In section 9 (security considerations):
Thanks for discussing network load here! However, I find this sentence a bi=
t

unsatisfactory:
=E2=80=9EThe specification of counter-measures for this problem is outside =
the scope

of this document.=E2=80=9C
Isn=E2=80=99t there any easy way to make some more recommendations for coun=
ter
measures
that could be discussed here? E.g. implement some rate limiting or
filtering.
Or only accept LIR-PF request from preconfigured hosts (given that LIR-PF
support must anyway be pre-configured)? I=E2=80=99m not an expert on this t=
opic and
therefore don=E2=80=99t know if any of such recommendations make sense, how=
ever, I
would quickly like to discuss if it is potentially possible to say more tha=
n

what=E2=80=99s current said. Thanks!

--000000000000aec74a05790e7a8b
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<html><head><style>body{font-family:Helvetica,Arial;font-size:13px}</style>=
</head><body style=3D"word-wrap:break-word"><div id=3D"bloop_customfont" st=
yle=3D"font-family:Helvetica,Arial;font-size:13px;margin:0px;line-height:au=
to">Hi!</div><div id=3D"bloop_customfont" style=3D"font-family:Helvetica,Ar=
ial;font-size:13px;margin:0px;line-height:auto"><br></div><div id=3D"bloop_=
customfont" style=3D"font-family:Helvetica,Arial;font-size:13px;margin:0px;=
line-height:auto">Protecting the control plane is a topic that is wider tha=
n this document=E2=80=A6or even wider than =E2=80=9Cjust for BGP=E2=80=9D (=
as covered by rfc7454).=C2=A0 Additional recommendations are given in both =
rfc7454 and rfc6192 =E2=80=94 this document should then have a reference to=
 them.</div><div id=3D"bloop_customfont" style=3D"font-family:Helvetica,Ari=
al;font-size:13px;margin:0px;line-height:auto"><br></div><div id=3D"bloop_c=
ustomfont" style=3D"font-family:Helvetica,Arial;font-size:13px;margin:0px;l=
ine-height:auto">My 2c.</div><div id=3D"bloop_customfont" style=3D"font-fam=
ily:Helvetica,Arial;font-size:13px;margin:0px;line-height:auto"><br></div><=
div id=3D"bloop_customfont" style=3D"font-family:Helvetica,Arial;font-size:=
13px;margin:0px;line-height:auto">Alvaro.</div> <br><p class=3D"airmail_on"=
>On October 24, 2018 at 5:28:55 AM, Mirja K=C3=BChlewind (<a href=3D"mailto=
:ietf@kuehlewind.net">ietf@kuehlewind.net</a>) wrote:</p> <blockquote type=
=3D"cite" class=3D"clean_bq"><span><div><span style=3D"color:rgb(0,0,0);fon=
t-family:&#39;helvetica Neue&#39;,helvetica;font-size:14px;font-style:norma=
l;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-al=
ign:start;text-indent:0px;text-transform:none;white-space:normal;word-spaci=
ng:0px;background-color:rgb(255,255,255);display:inline!important;float:non=
e">----------------------------------------------------------------------<s=
pan class=3D"Apple-converted-space">=C2=A0</span></span><br style=3D"color:=
rgb(0,0,0);font-family:&#39;helvetica Neue&#39;,helvetica;font-size:14px;fo=
nt-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:=
normal;text-align:start;text-indent:0px;text-transform:none;white-space:nor=
mal;word-spacing:0px"><span style=3D"color:rgb(0,0,0);font-family:&#39;helv=
etica Neue&#39;,helvetica;font-size:14px;font-style:normal;font-variant-cap=
s:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-ind=
ent:0px;text-transform:none;white-space:normal;word-spacing:0px;background-=
color:rgb(255,255,255);display:inline!important;float:none">DISCUSS:<span c=
lass=3D"Apple-converted-space">=C2=A0</span></span><br style=3D"color:rgb(0=
,0,0);font-family:&#39;helvetica Neue&#39;,helvetica;font-size:14px;font-st=
yle:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:norma=
l;text-align:start;text-indent:0px;text-transform:none;white-space:normal;w=
ord-spacing:0px"><span style=3D"color:rgb(0,0,0);font-family:&#39;helvetica=
 Neue&#39;,helvetica;font-size:14px;font-style:normal;font-variant-caps:nor=
mal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0=
px;text-transform:none;white-space:normal;word-spacing:0px;background-color=
:rgb(255,255,255);display:inline!important;float:none">--------------------=
--------------------------------------------------<span class=3D"Apple-conv=
erted-space">=C2=A0</span></span><br style=3D"color:rgb(0,0,0);font-family:=
&#39;helvetica Neue&#39;,helvetica;font-size:14px;font-style:normal;font-va=
riant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start=
;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0px"><=
br style=3D"color:rgb(0,0,0);font-family:&#39;helvetica Neue&#39;,helvetica=
;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:norm=
al;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:no=
ne;white-space:normal;word-spacing:0px"><span style=3D"color:rgb(0,0,0);fon=
t-family:&#39;helvetica Neue&#39;,helvetica;font-size:14px;font-style:norma=
l;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-al=
ign:start;text-indent:0px;text-transform:none;white-space:normal;word-spaci=
ng:0px;background-color:rgb(255,255,255);display:inline!important;float:non=
e">In section 9 (security considerations):<span class=3D"Apple-converted-sp=
ace">=C2=A0</span></span><br style=3D"color:rgb(0,0,0);font-family:&#39;hel=
vetica Neue&#39;,helvetica;font-size:14px;font-style:normal;font-variant-ca=
ps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-in=
dent:0px;text-transform:none;white-space:normal;word-spacing:0px"><span sty=
le=3D"color:rgb(0,0,0);font-family:&#39;helvetica Neue&#39;,helvetica;font-=
size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;let=
ter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;whi=
te-space:normal;word-spacing:0px;background-color:rgb(255,255,255);display:=
inline!important;float:none">Thanks for discussing network load here! Howev=
er, I find this sentence a bit<span class=3D"Apple-converted-space">=C2=A0<=
/span></span><br style=3D"color:rgb(0,0,0);font-family:&#39;helvetica Neue&=
#39;,helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;fo=
nt-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;tex=
t-transform:none;white-space:normal;word-spacing:0px"><span style=3D"color:=
rgb(0,0,0);font-family:&#39;helvetica Neue&#39;,helvetica;font-size:14px;fo=
nt-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:=
normal;text-align:start;text-indent:0px;text-transform:none;white-space:nor=
mal;word-spacing:0px;background-color:rgb(255,255,255);display:inline!impor=
tant;float:none">unsatisfactory:<span class=3D"Apple-converted-space">=C2=
=A0</span></span><br style=3D"color:rgb(0,0,0);font-family:&#39;helvetica N=
eue&#39;,helvetica;font-size:14px;font-style:normal;font-variant-caps:norma=
l;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px=
;text-transform:none;white-space:normal;word-spacing:0px"><span style=3D"co=
lor:rgb(0,0,0);font-family:&#39;helvetica Neue&#39;,helvetica;font-size:14p=
x;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-spac=
ing:normal;text-align:start;text-indent:0px;text-transform:none;white-space=
:normal;word-spacing:0px;background-color:rgb(255,255,255);display:inline!i=
mportant;float:none">=E2=80=9EThe specification of counter-measures for thi=
s problem is outside the scope<span class=3D"Apple-converted-space">=C2=A0<=
/span></span><br style=3D"color:rgb(0,0,0);font-family:&#39;helvetica Neue&=
#39;,helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;fo=
nt-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;tex=
t-transform:none;white-space:normal;word-spacing:0px"><span style=3D"color:=
rgb(0,0,0);font-family:&#39;helvetica Neue&#39;,helvetica;font-size:14px;fo=
nt-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:=
normal;text-align:start;text-indent:0px;text-transform:none;white-space:nor=
mal;word-spacing:0px;background-color:rgb(255,255,255);display:inline!impor=
tant;float:none">of this document.=E2=80=9C<span class=3D"Apple-converted-s=
pace">=C2=A0</span></span><br style=3D"color:rgb(0,0,0);font-family:&#39;he=
lvetica Neue&#39;,helvetica;font-size:14px;font-style:normal;font-variant-c=
aps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-i=
ndent:0px;text-transform:none;white-space:normal;word-spacing:0px"><span st=
yle=3D"color:rgb(0,0,0);font-family:&#39;helvetica Neue&#39;,helvetica;font=
-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;le=
tter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;wh=
ite-space:normal;word-spacing:0px;background-color:rgb(255,255,255);display=
:inline!important;float:none">Isn=E2=80=99t there any easy way to make some=
 more recommendations for counter measures<span class=3D"Apple-converted-sp=
ace">=C2=A0</span></span><br style=3D"color:rgb(0,0,0);font-family:&#39;hel=
vetica Neue&#39;,helvetica;font-size:14px;font-style:normal;font-variant-ca=
ps:normal;font-weight:normal;letter-spacing:normal;text-align:start;text-in=
dent:0px;text-transform:none;white-space:normal;word-spacing:0px"><span sty=
le=3D"color:rgb(0,0,0);font-family:&#39;helvetica Neue&#39;,helvetica;font-=
size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;let=
ter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;whi=
te-space:normal;word-spacing:0px;background-color:rgb(255,255,255);display:=
inline!important;float:none">that could be discussed here? E.g. implement s=
ome rate limiting or filtering.<span class=3D"Apple-converted-space">=C2=A0=
</span></span><br style=3D"color:rgb(0,0,0);font-family:&#39;helvetica Neue=
&#39;,helvetica;font-size:14px;font-style:normal;font-variant-caps:normal;f=
ont-weight:normal;letter-spacing:normal;text-align:start;text-indent:0px;te=
xt-transform:none;white-space:normal;word-spacing:0px"><span style=3D"color=
:rgb(0,0,0);font-family:&#39;helvetica Neue&#39;,helvetica;font-size:14px;f=
ont-style:normal;font-variant-caps:normal;font-weight:normal;letter-spacing=
:normal;text-align:start;text-indent:0px;text-transform:none;white-space:no=
rmal;word-spacing:0px;background-color:rgb(255,255,255);display:inline!impo=
rtant;float:none">Or only accept LIR-PF request from preconfigured hosts (g=
iven that LIR-PF<span class=3D"Apple-converted-space">=C2=A0</span></span><=
br style=3D"color:rgb(0,0,0);font-family:&#39;helvetica Neue&#39;,helvetica=
;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:norm=
al;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:no=
ne;white-space:normal;word-spacing:0px"><span style=3D"color:rgb(0,0,0);fon=
t-family:&#39;helvetica Neue&#39;,helvetica;font-size:14px;font-style:norma=
l;font-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-al=
ign:start;text-indent:0px;text-transform:none;white-space:normal;word-spaci=
ng:0px;background-color:rgb(255,255,255);display:inline!important;float:non=
e">support must anyway be pre-configured)? I=E2=80=99m not an expert on thi=
s topic and<span class=3D"Apple-converted-space">=C2=A0</span></span><br st=
yle=3D"color:rgb(0,0,0);font-family:&#39;helvetica Neue&#39;,helvetica;font=
-size:14px;font-style:normal;font-variant-caps:normal;font-weight:normal;le=
tter-spacing:normal;text-align:start;text-indent:0px;text-transform:none;wh=
ite-space:normal;word-spacing:0px"><span style=3D"color:rgb(0,0,0);font-fam=
ily:&#39;helvetica Neue&#39;,helvetica;font-size:14px;font-style:normal;fon=
t-variant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:s=
tart;text-indent:0px;text-transform:none;white-space:normal;word-spacing:0p=
x;background-color:rgb(255,255,255);display:inline!important;float:none">th=
erefore don=E2=80=99t know if any of such recommendations make sense, howev=
er, I<span class=3D"Apple-converted-space">=C2=A0</span></span><br style=3D=
"color:rgb(0,0,0);font-family:&#39;helvetica Neue&#39;,helvetica;font-size:=
14px;font-style:normal;font-variant-caps:normal;font-weight:normal;letter-s=
pacing:normal;text-align:start;text-indent:0px;text-transform:none;white-sp=
ace:normal;word-spacing:0px"><span style=3D"color:rgb(0,0,0);font-family:&#=
39;helvetica Neue&#39;,helvetica;font-size:14px;font-style:normal;font-vari=
ant-caps:normal;font-weight:normal;letter-spacing:normal;text-align:start;t=
ext-indent:0px;text-transform:none;white-space:normal;word-spacing:0px;back=
ground-color:rgb(255,255,255);display:inline!important;float:none">would qu=
ickly like to discuss if it is potentially possible to say more than<span c=
lass=3D"Apple-converted-space">=C2=A0</span></span><br style=3D"color:rgb(0=
,0,0);font-family:&#39;helvetica Neue&#39;,helvetica;font-size:14px;font-st=
yle:normal;font-variant-caps:normal;font-weight:normal;letter-spacing:norma=
l;text-align:start;text-indent:0px;text-transform:none;white-space:normal;w=
ord-spacing:0px"><span style=3D"color:rgb(0,0,0);font-family:&#39;helvetica=
 Neue&#39;,helvetica;font-size:14px;font-style:normal;font-variant-caps:nor=
mal;font-weight:normal;letter-spacing:normal;text-align:start;text-indent:0=
px;text-transform:none;white-space:normal;word-spacing:0px;background-color=
:rgb(255,255,255);display:inline!important;float:none">what=E2=80=99s curre=
nt said. Thanks!<span class=3D"Apple-converted-space">=C2=A0</span></span><=
br style=3D"color:rgb(0,0,0);font-family:&#39;helvetica Neue&#39;,helvetica=
;font-size:14px;font-style:normal;font-variant-caps:normal;font-weight:norm=
al;letter-spacing:normal;text-align:start;text-indent:0px;text-transform:no=
ne;white-space:normal;word-spacing:0px"></div></span></blockquote> <div id=
=3D"bloop_sign_1540477615177871872" class=3D"bloop_sign"></div></body></htm=
l>

--000000000000aec74a05790e7a8b--


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From: Sami Boutros <boutros.sami@gmail.com>
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To: "Mankamana Mishra (mankamis)" <mankamis@cisco.com>
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Subject: Re: [bess] Slot requests for BESS WG session - IETF 103 - Bangkok
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Hi,

I would like to get a 5 min slot for

Draft-Boutros-geneve-evpn-03

Thanks,

Sami

> On Oct 6, 2018, at 1:59 PM, Mankamana Mishra (mankamis) <mankamis@cisco.co=
m> wrote:
>=20
> All,
> =20
> It is time we start building the BESS WG agenda for IETF 103 Bangkok.
> =20
> Please send us your request for a presentation slot , indicating draft nam=
e, speaker, and desired duration (covering presentation and discussion). If i=
t is not the first presentation of the draft, please give a reason why it is=
 required to have a new presentation slot.
> =20
> =20
> Thank you
> =20
> Mankamana , Stephane & Matthew
> =20
> _______________________________________________
> BESS mailing list
> BESS@ietf.org
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<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">Hi,<div><br></div><div>I would like to get a 5 min slot for</div><div><br><div>Draft-Boutros-geneve-evpn-03</div><div><br></div><div>Thanks,</div><div><br></div><div>Sami</div><div><br>On Oct 6, 2018, at 1:59 PM, Mankamana Mishra (mankamis) &lt;<a href="mailto:mankamis@cisco.com">mankamis@cisco.com</a>&gt; wrote:<br><br></div><blockquote type="cite"><div>

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<p class="MsoNormal"><a name="_MailOriginalBody"><span style="font-size:11.0pt">All,</span></a><span style="font-size:11.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">It is time we start building the BESS WG agenda for IETF 103 Bangkok.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Please send us your request for a presentation slot , indicating draft name, speaker, and desired duration (covering presentation and discussion). If it is not the first presentation of the draft, please give
 a reason why it is required to have a new presentation slot.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">&nbsp;<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Thank you<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p>&nbsp;</o:p></span></p>
<p class="MsoNormal"><span style="font-family:&quot;Times New Roman&quot;,serif">Mankamana , Stephane &amp; Matthew<o:p></o:p></span></p>
<p class="MsoNormal"><o:p>&nbsp;</o:p></p>
</div>


</div></blockquote><blockquote type="cite"><div><span>_______________________________________________</span><br><span>BESS mailing list</span><br><span><a href="mailto:BESS@ietf.org">BESS@ietf.org</a></span><br><span><a href="https://www.ietf.org/mailman/listinfo/bess">https://www.ietf.org/mailman/listinfo/bess</a></span><br></div></blockquote></div></body></html>
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From: "Wanghaibo (Rainsword)" <rainsword.wang@huawei.com>
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</head>
<body lang=3D"ZH-CN" link=3D"#0563C1" vlink=3D"#954F72">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Hi John=
,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">I think=
 the control word function is independent of the tunnel encapsulation. It i=
s not very suitable to use the tunnel-encap draft extension.<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Regards=
,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Haibo<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> John E Drake [mailto:jdrake@juniper.net]
<br>
<b>Sent:</b> Thursday, October 25, 2018 12:03 AM<br>
<b>To:</b> Alexander Vainshtein &lt;Alexander.Vainshtein@ecitele.com&gt;; Y=
utianpeng (Tim) &lt;yutianpeng@huawei.com&gt;<br>
<b>Cc:</b> bess@ietf.org; draft-wang-bess-evpn-control-word.authors@ietf.or=
g; Wanghaibo (Rainsword) &lt;rainsword.wang@huawei.com&gt;<br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-word=
<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Hi,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Comment inline<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Yours Irrespectively,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">John<o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0cm 0cm 0cm =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> BESS &lt;<a href=3D"mailto:bess-bounces@ietf.org">bess-bounces@=
ietf.org</a>&gt;
<b>On Behalf Of </b>Alexander Vainshtein<br>
<b>Sent:</b> Wednesday, October 24, 2018 11:57 AM<br>
<b>To:</b> Yutianpeng (Tim) &lt;<a href=3D"mailto:yutianpeng@huawei.com">yu=
tianpeng@huawei.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; <a href=3D"m=
ailto:draft-wang-bess-evpn-control-word.authors@ietf.org">
draft-wang-bess-evpn-control-word.authors@ietf.org</a>; Wanghaibo (Rainswor=
d) &lt;<a href=3D"mailto:rainsword.wang@huawei.com">rainsword.wang@huawei.c=
om</a>&gt;<br>
<b>Subject:</b> Re: [bess] A question regarding draft-wang-bess-evepn-contr=
ol-word<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Tim,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Lots of thanks for your email, it really clarifies your=
 approach.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Regarding your proposal to =A1=B0isolate=A1=B1 PEs that=
 do not support the CW - I suspect this is not practical.<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">EVPN-MPLS implementations are not REQUIRED to support u=
sage of CW. Some EVPN-MPLS implementations that I am aware of explicitly st=
ate that the CW usage can be disabled
 for interoperability with other vendors, so I think that there EVPN implem=
entations that do not support the CW have been deployed.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<pre><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fareast-language:EN-US=
"><a href=3D"https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__tools.i=
etf.org_html_draft-2Dietf-2Dpals-2Dethernet-2Dcw-2D07&amp;d=3DDwMFoQ&amp;c=
=3DHAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&amp;r=3DCRB2tJiQePk0cT-h5LGh=
EWH-s_xXXup3HzvBSMRj5VE&amp;m=3Dg3IVbNU54cy6Djewd3jxs8hIBf3n6Y8tCS54HplvNNE=
&amp;s=3DRlsyHSL6EDro6sABzjF38r6G2sDcGBosVDYDmwnPbZA&amp;e=3D">draft-ietf-p=
als-ethernet-cw</a> (already in the RFC Editor queue in the AUTH48 state) s=
ays that =A1=B0</span><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-f=
amily:&quot;Courier New&quot;;color:black;background:yellow;mso-highlight:y=
ellow;mso-fareast-language:EN-US">where both the ingress PE and the egress =
PE support the Ethernet pseudowire control word</span><span lang=3D"EN-US" =
style=3D"font-size:10.0pt;font-family:&quot;Courier New&quot;;color:black;m=
so-fareast-language:EN-US">, then the CW MUST be used</span><span lang=3D"E=
N-US" style=3D"color:#1F497D;mso-fareast-language:EN-US">=A1=B1. <o:p></o:p=
></span></pre>
<pre><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fareast-language:EN-US=
"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fareast-language:EN-US=
">Personally I think that this sets the goal that we should achieve in EVPN=
 as well:<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-list:l2 level1 lfo=
2"><![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;mso-far=
east-language:EN-US"><span style=3D"mso-list:Ignore">1.<span style=3D"font:=
7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </s=
pan></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;mso=
-fareast-language:EN-US">All EVPN-MPLS implementations MUST support EVPN en=
capsulations without the CW<o:p></o:p></span></pre>
<pre style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-list:l2 level1 lfo=
2"><![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;mso-far=
east-language:EN-US"><span style=3D"mso-list:Ignore">2.<span style=3D"font:=
7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </s=
pan></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;mso=
-fareast-language:EN-US">An egress PE SHOULD indicate, <span style=3D"backg=
round:yellow;mso-highlight:yellow">per each L2VPN/EVPN route it advertises<=
/span>, whether it can handle received CW in the EVPN encapsulation for pac=
kets that are sent to it based on this route by ingress PEs, or not, and, i=
f it can, how the presence of the CW is indicated. &nbsp;This can be done u=
sing the CW Next-Hop Capability and the CWI label as explained in the draft=
<o:p></o:p></span></pre>
<pre><b><i><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fareast-language=
:EN-US"><o:p>&nbsp;</o:p></span></i></b></pre>
<pre><b><i><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fareast-language=
:EN-US">[JD]&nbsp; I think it would be better to use this draft:&nbsp; &nbs=
p;&nbsp;<a href=3D"https://tools.ietf.org/html/draft-ietf-idr-tunnel-encaps=
-10">https://tools.ietf.org/html/draft-ietf-idr-tunnel-encaps-10</a><o:p></=
o:p></span></i></b></pre>
<pre><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fareast-language:EN-US=
"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fareast-language:EN-US=
"><o:p>&nbsp;</o:p></span></pre>
<pre style=3D"margin-left:36.0pt;text-indent:-18.0pt;mso-list:l2 level1 lfo=
2"><![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;mso-far=
east-language:EN-US"><span style=3D"mso-list:Ignore">3.<span style=3D"font:=
7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </s=
pan></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;mso=
-fareast-language:EN-US">An ingress PE that accepts a L2VPN/EVPN route with=
 the CW next Hop Capability, MUST insert the CW and indicate its presence, =
<b><i>if it supports CWI and CW insertion in the appropriate EVPN encapsula=
tion</i></b>. Please note that the ability to insert CWI and CW may differ =
for different L2VPN/EVPN routes. E.g.. the same PE can:<o:p></o:p></span></=
pre>
<pre style=3D"margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level2 lfo=
2"><![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;mso-far=
east-language:EN-US"><span style=3D"mso-list:Ignore">a.<span style=3D"font:=
7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </s=
pan></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;mso=
-fareast-language:EN-US">Support the CWI and CW insertion in the EVPN encap=
sulation of =A1=B0known unicast=A1=B1 frames and BUM frames if their encaps=
ulation does not require insertion of the ESI label<o:p></o:p></span></pre>
<pre style=3D"margin-left:72.0pt;text-indent:-18.0pt;mso-list:l2 level2 lfo=
2"><![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;mso-far=
east-language:EN-US"><span style=3D"mso-list:Ignore">b.<span style=3D"font:=
7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></=
span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;mso-farea=
st-language:EN-US">Not support CWI and CW insertion in the EVPN encapsulati=
on of BUM frames if this inclusion of the ESI label in their encapsulation =
is required.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fareast-language:EN-US=
"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fareast-language:EN-US=
">This approach would &nbsp;meet with the old IETF design principle: =A1=B0=
Be strict in what you transmit and liberal in what you receive=A1=B1.<o:p><=
/o:p></span></pre>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Hope this helps.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">My 2c,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ec=
itele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Yutianpeng (Tim) [<a href=3D"mailto:yutianpeng@huawei.com">mail=
to:yutianpeng@huawei.com</a>]
<br>
<b>Sent:</b> Wednesday, October 24, 2018 5:32 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein@=
ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@ietf=
.org">draft-wang-bess-evpn-control-word.authors@ietf.org</a>;
<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; Wanghaibo (Rainsword) &=
lt;<a href=3D"mailto:rainsword.wang@huawei.com">rainsword.wang@huawei.com</=
a>&gt;<br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-word=
<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Hi Sash=
a,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Thanks =
a lot for your advice.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">I agree=
 with you that CW is not mandatory for all traffic, mainly unicast. This dr=
aft focuses on CW capability advertisement and is applicable to traffic nee=
ds CW processing. &nbsp;So far BUM should be
 not relevant to this draft. (Multicast might need CW potentially we realiz=
e recently, but we will visit this topic later.)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Some cl=
arification on my proposal:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">I belie=
ve we need a mechanism of negotiation on CW capabilities in EVPN ELAN. If y=
ou check PW or EVPN VPWS there is a clear procedure on negotiation between =
two ends.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Refer t=
o: <a href=3D"https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__tools.=
ietf.org_html_rfc4447-23section-2D6&amp;d=3DDwMFoQ&amp;c=3DHAkYuh63rsuhr6Sc=
bfh0UjBXeMK-ndb3voDTXcWzoCI&amp;r=3DCRB2tJiQePk0cT-h5LGhEWH-s_xXXup3HzvBSMR=
j5VE&amp;m=3Dg3IVbNU54cy6Djewd3jxs8hIBf3n6Y8tCS54HplvNNE&amp;s=3DNBPHKHjAHD=
92xWWgTzgyFMNLRRjgyaGjNsqLclZyQYw&amp;e=3D">
<span style=3D"color:#1F497D;text-decoration:none">https://tools.ietf.org/h=
tml/rfc4447#section-6</span></a> and
<a name=3D"appendix-A"></a><a href=3D"https://urldefense.proofpoint.com/v2/=
url?u=3Dhttps-3A__tools.ietf.org_html_rfc4447-23appendix-2DA&amp;d=3DDwMFoQ=
&amp;c=3DHAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&amp;r=3DCRB2tJiQePk0cT=
-h5LGhEWH-s_xXXup3HzvBSMRj5VE&amp;m=3Dg3IVbNU54cy6Djewd3jxs8hIBf3n6Y8tCS54H=
plvNNE&amp;s=3DO9MUigxU7UJ6prd0ZtH3-87IEYswalB2pRb1_UuKPyM&amp;e=3D"><span =
style=3D"color:#1F497D;text-decoration:none">Appendix
 A</span></a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">But as =
EVPN is MP2MP, in case of PE CW behavior can be different between PEs as th=
ere is no negotiation at all at the moment.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">So this=
 draft introduces CW capability which at least allows PEs within EVI knows =
the capability of each other. It also defines behavior after receiving CW c=
apabilities.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">What I =
proposed is the behavior in case CW capabilities across PEs are different. =
I mentioned a simple way of tearing down or isolate CW disabled PEs and rai=
se an alarm, a bit similar to PW. The
 draft proposes a graceful way that traffic can be forwarded with a label a=
dvertised together with CW capability, such that egress PE can indicate CW =
via the label on the forwarding plane.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Happy f=
or further discussion on this as CW of EVPN topic has been raised couple of=
 times recently.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Thanks =
&amp; Regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Tim<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Alexander Vainshtein [<a href=3D"mailto:Alexander.Vainshtein@ec=
itele.com">mailto:Alexander.Vainshtein@ecitele.com</a>]
<br>
<b>Sent:</b> 24 October 2018 09:39<br>
<b>To:</b> Yutianpeng (Tim) &lt;<a href=3D"mailto:yutianpeng@huawei.com">yu=
tianpeng@huawei.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@ietf=
.org">draft-wang-bess-evpn-control-word.authors@ietf.org</a>;
<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; Wanghaibo (Rainsword) &=
lt;<a href=3D"mailto:rainsword.wang@huawei.com">rainsword.wang@huawei.com</=
a>&gt;<br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-word=
<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Tim,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Lots of thanks for sharing your views.<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Unfortunately, I doubt the approach that you propose: a=
lways use or do not use CW in the same EVI.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">The problem, as I see it is that known unicast and BUM =
traffic may be handled differently when it comes to EVPN encapsulation:<o:p=
></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l3 leve=
l1 lfo4"><![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;m=
so-fareast-language:EN-US"><span style=3D"mso-list:Ignore">1.<span style=3D=
"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;=
mso-fareast-language:EN-US">Section 18 of RFC 7432 explicitly states that =
=A1=B0When sending EVPN-encapsulated packets over a P2MP LSP or P2P LSP, th=
en the control word SHOULD NOT be used=A1=B1<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l3 level2 lfo4">
<![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fareas=
t-language:EN-US"><span style=3D"mso-list:Ignore">a.<span style=3D"font:7.0=
pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;=
mso-fareast-language:EN-US">This recommendation is quite reasonable because=
 the LSPs in question are not affected by ECMP, so there is no need to use =
the CW to prevent ECMP-cause reordering<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l3 level2 lfo4">
<![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fareas=
t-language:EN-US"><span style=3D"mso-list:Ignore">b.<span style=3D"font:7.0=
pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;=
mso-fareast-language:EN-US">It is quite possible to P2MP LSPs as the P-tunn=
eling technology delivery of BUM traffic in EVPN while using MP2P LSPs for =
carrying known unicast traffic<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l3 level2 lfo4">
<![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fareas=
t-language:EN-US"><span style=3D"mso-list:Ignore">c.<span style=3D"font:7.0=
pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><b><span lang=3D"EN-US" style=3D"color:#1F49=
7D;mso-fareast-language:EN-US">The bottom line</span></b><span lang=3D"EN-U=
S" style=3D"color:#1F497D;mso-fareast-language:EN-US">: RFC 7432 defines th=
e &nbsp;scenario when the CW SHOULD be used in
 the EVPN encapsulation of the known unicast traffic but SHOULD NOT be used=
 in the EVPN encapsulation of BUM traffic as valid<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l3 leve=
l1 lfo4"><![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;m=
so-fareast-language:EN-US"><span style=3D"mso-list:Ignore">2.<span style=3D=
"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;=
mso-fareast-language:EN-US">I am aware (this information is publicly availa=
ble) of at least one deployed EVPN implementation that:<o:p></o:p></span></=
p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l3 level2 lfo4">
<![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fareas=
t-language:EN-US"><span style=3D"mso-list:Ignore">a.<span style=3D"font:7.0=
pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;=
mso-fareast-language:EN-US">By default includes the CW in the EVPN encapsul=
ation of known unicast traffic (this default behavior can be disabled by ex=
plicit configuration)<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l3 level2 lfo4">
<![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fareas=
t-language:EN-US"><span style=3D"mso-list:Ignore">b.<span style=3D"font:7.0=
pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;=
mso-fareast-language:EN-US">Does not include the CW in the EVPN encapsulati=
on of BUM traffic, presumably due to limitations imposed by the forwarding =
HW.<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l3 level2 lfo4">
<![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fareas=
t-language:EN-US"><span style=3D"mso-list:Ignore">c.<span style=3D"font:7.0=
pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><b><span lang=3D"EN-US" style=3D"color:#1F49=
7D;mso-fareast-language:EN-US">The bottom line</span></b><span lang=3D"EN-U=
S" style=3D"color:#1F497D;mso-fareast-language:EN-US">: inconsistent usage =
of CW in the EVPN encapsulation within the
 same EVI (with differences between known unicast and BUM traffic) is alrea=
dy a fact on the ground (at least, to some extent).<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">My 2c,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ec=
itele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Yutianpeng (Tim) [<a href=3D"mailto:yutianpeng@huawei.com">mail=
to:yutianpeng@huawei.com</a>]
<br>
<b>Sent:</b> Tuesday, October 23, 2018 5:48 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein@=
ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;; Wanghaibo (Rainsword=
) &lt;<a href=3D"mailto:rainsword.wang@huawei.com">rainsword.wang@huawei..c=
om</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@ietf=
.org">draft-wang-bess-evpn-control-word.authors@ietf.org</a>;
<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a><br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-word=
<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Hi Sash=
a,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">I am al=
so thinking of this recently but haven=A1=AFt talked with author yet.<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">What wa=
s in my mind the solution is actually simple: directly tear down (part of) =
the mac-VRF or EVI directly if CW capabilities not consistent, considering =
behavior in one EVI should keep consistent
 (personally believe). &nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">I might=
 tend to the mechanism as below:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">If rout=
er A has CW capabilities and receive type 1 or type 2 routes without CW, th=
en A should drop these routes and report an alarm.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">If rout=
er A does not has CW capabilities and receive type 1 or type 2 routes with =
CW, then A should drop these routes and report an alarm.<o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">I belie=
ve the behavior within EVI or Mac-VRF should keep consistent, otherwise, mo=
re questions will pop out.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">Conside=
ring if a service is sensitive to packet misordering and it is ELAN, I tend=
 to keep behavior within this ELAN consistent.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D">There c=
ould also be other problems with this approach, just share an idea so far o=
pen the discussion.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Regards, and lots of thanks in advance,<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Tim<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D"><o:p>&n=
bsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> BESS [<a href=3D"mailto:bess-bounces@ietf.org">mailto:bess-boun=
ces@ietf.org</a>]
<b>On Behalf Of </b>Alexander Vainshtein<br>
<b>Sent:</b> 23 October 2018 14:42<br>
<b>To:</b> Wanghaibo (Rainsword) &lt;<a href=3D"mailto:rainsword.wang@huawe=
i.com">rainsword.wang@huawei.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@ietf=
.org">draft-wang-bess-evpn-control-word.authors@ietf.org</a>;
<a href=3D"mailto:bess@ietf.org">bess@ietf.org</a><br>
<b>Subject:</b> Re: [bess] A question regarding draft-wang-bess-evepn-contr=
ol-word<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Dear Haibo,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Again,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Lots of thanks for a prompt response.<o:p></o:p></span>=
</p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">My reading of your response is as following:<o:p></o:p>=
</span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo6"><![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;m=
so-fareast-language:EN-US"><span style=3D"mso-list:Ignore">1.<span style=3D=
"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;=
mso-fareast-language:EN-US">All egress PEs can receive EVPN-encapsulated pa=
ckets
<b><i>without the CW</i></b><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo6"><![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;m=
so-fareast-language:EN-US"><span style=3D"mso-list:Ignore">2.<span style=3D=
"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;=
mso-fareast-language:EN-US">All ingress PEs can sent EVPN-encapsulated pack=
ets
<b><i>without the CW</i></b><o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo6"><![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;m=
so-fareast-language:EN-US"><span style=3D"mso-list:Ignore">3.<span style=3D=
"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;=
mso-fareast-language:EN-US">An egress PE that can receive EVPN-encapsulated=
 packets with the CW in the EVPN encapsulation, &nbsp;must add the appropri=
ate NH Capability attribute that indicates
 the CW-indicating label value (explicitly or implicitly) to all relevant E=
VPN routes. &nbsp;This includes:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l0 level2 lfo6">
<![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fareas=
t-language:EN-US"><span style=3D"mso-list:Ignore">a.<span style=3D"font:7.0=
pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;=
mso-fareast-language:EN-US">Per-EVI Ethernet A-D route (EVPN Route Type 1).=
 In this case the CWI label would follow the label advertised in the NLRI o=
f this route<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:72.0pt;text-indent:-18.0=
pt;mso-list:l0 level2 lfo6">
<![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fareas=
t-language:EN-US"><span style=3D"mso-list:Ignore">b.<span style=3D"font:7.0=
pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;=
mso-fareast-language:EN-US">MAC/IP Advertisement route (EVPN Type 2 route).=
 In this case the CWI label would follow the label advertised in the NLRI a=
s Label1, it would not be relevant for
 packets that are encapsulated using Label2 (used with the Symmetric EVPN I=
RB).<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l0 leve=
l1 lfo6"><![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;m=
so-fareast-language:EN-US"><span style=3D"mso-list:Ignore">4.<span style=3D=
"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;=
mso-fareast-language:EN-US">An ingress PE that has received an EVPN route w=
ith the CW capability attribute wand that can support usage of CW in the EV=
PN encapsulation, will insert both the
 CWI advertised in the CW capability attribute, and the CW in the EVPN pack=
ets it sends to the corresponding egress PE.&nbsp; If it does not support u=
sage of CW in the encapsulation, it will not insert this label.<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Is this understanding correct?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">If yes, I still have a couple of questions:<o:p></o:p><=
/span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.7pt;text-indent:-18.0=
pt;mso-list:l1 level1 lfo8">
<![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fareas=
t-language:EN-US"><span style=3D"mso-list:Ignore">1.<span style=3D"font:7.0=
pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;=
mso-fareast-language:EN-US">Suppose that you use ingress replication (IR) t=
o deliver BUM traffic across EVPN. The Ingress Replication label would be a=
dvertised in the PTA attribute of the
 Inclusive Multicast Ethernet Tag Route (EVPN Type 3 route); it will not be=
 part of the NLRI. Do you expect the same logic to be used with regard to C=
W capabilities and CWI label advertisement applied also to these routes?<o:=
p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"margin-left:38.7pt;text-indent:-18.0=
pt;mso-list:l1 level1 lfo8">
<![if !supportLists]><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fareas=
t-language:EN-US"><span style=3D"mso-list:Ignore">2.<span style=3D"font:7.0=
pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US" style=3D"color:#1F497D;=
mso-fareast-language:EN-US">Per-ES Ethernet A-D Routes are advertised with =
the ECI expended Community that carries within the so-called ESI label. Thi=
s label is included the EVPN encapsulation
 of BUM packets sent to the PE that is attached to the same multi-homed ES =
from which the original ES packet has been received. Do you expect the same=
 logic to be used with regard to CW capabilities and CWI label advertisemen=
t applied also to these routes with
 the CWI label following the ESI label in the EVPN encapsulation of BUM pac=
kets?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Regards, and lots of thanks in advance,<o:p></o:p></spa=
n></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ec=
itele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Wanghaibo (Rainsword) [<a href=3D"mailto:rainsword.wang@huawei.=
com">mailto:rainsword.wang@huawei.com</a>]
<br>
<b>Sent:</b> Tuesday, October 23, 2018 2:34 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein@=
ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; <a href=3D"m=
ailto:draft-wang-bess-evpn-control-word.authors@ietf.org">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-word=
<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Hi Alex=
ander,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The sol=
ution here is to carry the next hop capability attribute when the route is =
advertised. The capability carried here is the control word capability.<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The spe=
cific format of the next hop capability can be referred to the draft.:
<b>&lt;draft-ietf-idr-next-hop-capability&gt;<o:p></o:p></b></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | Capability Code (2 octets)&nbsp;&nbsp; |<o=
:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | Capability Length (2 octets) |<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | Capability Value (variable)&nbsp; |<o:p></=
o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ~&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; ~<o:p></o:p></span=
></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">For the=
 control word capability , it may encode as :<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | CW Capabality Type (TBD)&nbsp; &nbsp;&nbsp=
;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | CW Length (0 or 3) &nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | CWI Label (may not exist) &nbsp;&nbsp;&nbs=
p;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">CWI (Co=
ntrol word indication)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">And the=
 forwarding Packet example.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&#43;------------------------------&#43=
;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | Tunnel Label &nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></=
o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | EVI Label&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | CW Indicate Label &nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; | Control word&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;|<o:p></=
o:p></span></p>
<p class=3D"MsoNormal" style=3D"background:#E0E0E0"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:Consolas;color:#404040">&nbsp;&nbsp;&nb=
sp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;------------------------------&#43;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The dif=
ference between the two methods is that which value should be use for the c=
ontrol word capability indicates label.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Method =
1, use reserved label, which should be assigned by IANA, (such as the entro=
py label, which is the value of 7)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">If we u=
se this method, then the control word capability attribute</span><span styl=
e=3D"font-size:10.5pt;font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans=
-serif;color:black">=A1=AF<span lang=3D"EN-US">s
 CW length use 0 is enough.<o:p></o:p></span></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">And the=
 forwarding packet use the IANA specified value as the CWI (Control word in=
dication) Label .(Perhaps 8 or others)<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Method2=
, use normal value, which is assigned by router.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">If we u=
se this method, then the router must assign a label used for the CWI. Perha=
ps label. And the control word capability attribute</span><span style=3D"fo=
nt-size:10.5pt;font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;=
color:black">=A1=AF<span lang=3D"EN-US">s
 CW length must be 3 and must contain the value in the update message.<o:p>=
</o:p></span></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The for=
warding packet must use that value as the CWI label.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Regards=
,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Haibo<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> Alexander Vainshtein [<a href=3D"mailto:Alexander.Vainshtein@ec=
itele.com">mailto:Alexander.Vainshtein@ecitele.com</a>]
<br>
<b>Sent:</b> Tuesday, October 23, 2018 6:09 PM<br>
<b>To:</b> Wanghaibo (Rainsword) &lt;<a href=3D"mailto:rainsword.wang@huawe=
i.com">rainsword.wang@huawei.com</a>&gt;<br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a>; <a href=3D"m=
ailto:draft-wang-bess-evpn-control-word.authors@ietf.org">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b>Subject:</b> RE: A question regarding draft-wang-bess-evepn-control-word=
<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Dear Haibo,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Lots of thanks for an extra-prompt response to my quest=
ion.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">There may be some misunderstanding here.<o:p></o:p></sp=
an></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">The draft says (the important text is highlighted):<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;There are
<span style=3D"background:yellow;mso-highlight:yellow">two methods</span> t=
o specified the control word indicator label:<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The first method is to apply=
 for a reserved label to indicate<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;whether the packet contains =
a control word;<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; The second method is to
<span style=3D"background:yellow;mso-highlight:yellow">apply for a new labe=
l</span> when the sending<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; router advertises the contro=
l word capability,
<span style=3D"background:yellow;mso-highlight:yellow">which is used to<o:p=
></o:p></span></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;background:y=
ellow;mso-highlight:yellow;mso-fareast-language:EN-US">&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp; indicate whether the control word is included in the packet</spa=
n><span lang=3D"EN" style=3D"font-size:12.0pt;font-family:&quot;Courier New=
&quot;;mso-fareast-language:EN-US">.<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"page-break-before:always"><span lang=3D"EN"=
 style=3D"font-size:12.0pt;font-family:&quot;Courier New&quot;;mso-fareast-=
language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">My question referred just to the 2<sup>nd</sup> method,=
 while your response seems to deal with the 1<sup>st</sup> one.<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Did I miss something?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Office: &#43;972-39266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &#43;972-549266302<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US">Email:&nbsp;&nbsp;
<a href=3D"mailto:Alexander.Vainshtein@ecitele.com">Alexander.Vainshtein@ec=
itele.com</a><o:p></o:p></span></p>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"color:#1F497D;mso-fare=
ast-language:EN-US"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> BESS [<a href=3D"mailto:bess-bounces@ietf.org">mailto:bess-boun=
ces@ietf.org</a>]
<b>On Behalf Of </b>Wanghaibo (Rainsword)<br>
<b>Sent:</b> Tuesday, October 23, 2018 12:03 PM<br>
<b>To:</b> Alexander Vainshtein &lt;<a href=3D"mailto:Alexander.Vainshtein@=
ecitele.com">Alexander.Vainshtein@ecitele.com</a>&gt;;
<a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@ietf.org">draft=
-wang-bess-evpn-control-word.authors@ietf.org</a><br>
<b>Cc:</b> <a href=3D"mailto:bess@ietf.org">bess@ietf.org</a><br>
<b>Subject:</b> [bess] </span><span style=3D"font-family:=CB=CE=CC=E5">=B4=
=F0=B8=B4</span><span lang=3D"EN-US">: A question regarding draft-wang-bess=
-evepn-control-word<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Hi Alex=
ander,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The num=
ber of routes advertised by the Sender router in our solution will not chan=
ge, but only carries a next hop capability attribute with control word
 capability<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The Rec=
eiver router determines whether to carry the control word when forwarding p=
ackets according to its own capabilities.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">The fol=
lowing figure is an example.:<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">PE1----=
------PE2<o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"text-indent:10.5pt"><span lang=3D"EN-US" st=
yle=3D"font-size:10.5pt;font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sa=
ns-serif;color:black">|-----------PE3<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">When PE=
1 advertises a route, it carries the next hop attribute of the control word=
 capability. The routes received by PE2 and PE3 are the same.<o:p></o:p></s=
pan></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">If &nbs=
p;PE2 do not support the control word, it will not carry the control word w=
hen forwarding packets to PE1.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">PE1 can=
not find the control word indication label when parsing the PE2 packet. PE1=
 will treat the packet as normal.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">If &nbs=
p;PE3 support the control word, it can add a control word when forwarding t=
he packet to the PE1, and add the control word indication label specified
 by the PE1. <o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">When th=
e PE1 receives the packet and finds the control word indication label in th=
e packet. PE1 will correctly process the control word.<o:p></o:p></span></p=
>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Thanks<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black">Haibo<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;font-=
family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,sans-serif;color:black"><o:p>&n=
bsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=
=C5=BA=DA&quot;,sans-serif">=B7=A2=BC=FE=C8=CB<span lang=3D"EN-US">:</span>=
</span></b><span lang=3D"EN-US" style=3D"font-family:&quot;=CE=A2=C8=ED=D1=
=C5=BA=DA&quot;,sans-serif"> Alexander Vainshtein [<a href=3D"mailto:Alexan=
der.Vainshtein@ecitele.com">mailto:Alexander.Vainshtein@ecitele.com</a>]
<br>
</span><b><span style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&quot;,s=
ans-serif">=B7=A2=CB=CD=CA=B1=BC=E4<span lang=3D"EN-US">:</span></span></b>=
<span lang=3D"EN-US" style=3D"font-family:&quot;=CE=A2=C8=ED=D1=C5=BA=DA&qu=
ot;,sans-serif"> 2018</span><span style=3D"font-family:&quot;=CE=A2=C8=ED=
=D1=C5=BA=DA&quot;,sans-serif">=C4=EA<span lang=3D"EN-US">10</span>=D4=C2<s=
pan lang=3D"EN-US">23</span>=C8=D5<span lang=3D"EN-US">
 16:46<br>
</span><b>=CA=D5=BC=FE=C8=CB<span lang=3D"EN-US">:</span></b><span lang=3D"=
EN-US"> <a href=3D"mailto:draft-wang-bess-evpn-control-word.authors@ietf.or=
g">
draft-wang-bess-evpn-control-word.authors@ietf.org</a><br>
</span><b>=B3=AD=CB=CD<span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"=
> <a href=3D"mailto:bess@ietf.org">
bess@ietf.org</a><br>
</span><b>=D6=F7=CC=E2<span lang=3D"EN-US">:</span></b><span lang=3D"EN-US"=
> A question regarding draft-wang-bess-evepn-control-word<o:p></o:p></span>=
</span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Dear authors of <a href=3D"http=
s://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__tools.ietf.org_html_draf=
t-2Dwang-2Dbess-2Devpn-2Dcontrol-2Dword-2D00&amp;d=3DDwMFoQ&amp;c=3DHAkYuh6=
3rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&amp;r=3DCRB2tJiQePk0cT-h5LGhEWH-s_xXXu=
p3HzvBSMRj5VE&amp;m=3Dg3IVbNU54cy6Djewd3jxs8hIBf3n6Y8tCS54HplvNNE&amp;s=3Dw=
szxoY3qdrIHkit3qIXzuYJrQJKe-90c2fu3AJvqwlw&amp;e=3D">
draft-wang-bess-evpn-control-word</a>,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">I have doubts regarding at leas=
t one of the approaches for negotiating the CW usage in the EVPN encapsulat=
ion between egress and ingress PE that is defined in the draft.<o:p></o:p><=
/span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">In the case when the egress PE =
can receive EVPN-encapsulated packets both with and without CW, the draft s=
eems to propose (as one of the possibilities) advertisement of two EVPN rou=
tes for each ES or MAC/IP pair:<o:p></o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l4 leve=
l1 lfo10">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">-=
<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">One of these routes wou=
ld use the CW Capability to indicate that it refers to the EVPN encapsulati=
on that uses the CW, and would carry the appropriate label in its NLRI<o:p>=
</o:p></span></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-18.0pt;mso-list:l4 leve=
l1 lfo10">
<![if !supportLists]><span lang=3D"EN-US"><span style=3D"mso-list:Ignore">-=
<span style=3D"font:7.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&n=
bsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
</span></span></span><![endif]><span lang=3D"EN-US">The other route would n=
ot use the CW Capability to indicate that it refers to the EVPN encapsulati=
on that does not use the CW, and carry a different label in its NLRI<o:p></=
o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">The ingress PE that accepts the=
se routes would then use one of them based on its own ability to use the CW=
 (or lack thereof), and use the corresponding label it its EVPN encapsulati=
on, while &nbsp;the DP in the egress PW would
 infer presence or absence of the CW from the received EVPN application lab=
el.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Unfortunately, I do not think t=
hat this can work because, as per
<a href=3D"https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__tools.iet=
f.org_html_rfc7432&amp;d=3DDwMFoQ&amp;c=3DHAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3v=
oDTXcWzoCI&amp;r=3DCRB2tJiQePk0cT-h5LGhEWH-s_xXXup3HzvBSMRj5VE&amp;m=3Dg3IV=
bNU54cy6Djewd3jxs8hIBf3n6Y8tCS54HplvNNE&amp;s=3DYoT9XgzHA1XwCe6z755-DP6mPdI=
zYKlzA0L-uxm9pVk&amp;e=3D">
RFC 7432</a>, labels in the labeled NLRI of EVPN routes are not part of the=
 route key for the purpose of the BGP route key processing, while the label=
 is treated just as the BGP attribute. This means that, unless some form of=
 BGP multi-path is enabled in the
 ingress PE (and in all RRs on the way between the egress PE and ingress PE=
) for the L2VPN/EVPN &nbsp;AFI/SAFI, only one of these routes will be selec=
ted by the BGP selection process.
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Did I miss something substantia=
l here?<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Regards, and lots of thanks in =
advance,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Sasha<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Office: &#43;972-39266302<o:p><=
/o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Cell:&nbsp;&nbsp;&nbsp;&nbsp;&n=
bsp; &#43;972-549266302<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US">Email:&nbsp;&nbsp; <a href=3D"m=
ailto:Alexander.Vainshtein@ecitele.com">
Alexander.Vainshtein@ecitele.com</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;Times New Roman&quot;,serif"><br>
___________________________________________________________________________=
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tion which is
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CONFIDENTIAL and which may be proprietary to ECI Telecom. If you have recei=
ved this
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elete the original
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<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:=CB=CE=CC=E5"><br>
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This e-mail message is intended for the recipient only and contains informa=
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family:=CB=CE=CC=E5"><br>
___________________________________________________________________________=
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This e-mail message is intended for the recipient only and contains informa=
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elete the original
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___________________________________________________________________________=
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<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:=CB=CE=CC=E5"><br>
___________________________________________________________________________=
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This e-mail message is intended for the recipient only and contains informa=
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From: James Bensley <jwbensley@gmail.com>
Date: Mon, 29 Oct 2018 13:33:52 +0000
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Subject: Re: [bess] CW in EVPN: Was Signaling Control Word in EVPN
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On Tue, 23 Oct 2018 at 09:28, Alexander Vainshtein
<Alexander.Vainshtein@ecitele.com> wrote:
>
> James,
>
> I am adding PALS WG to the list of addressees because, AFAIK, the PW CW i=
s defined in this WG.
>
>
>
> I think that the really observed problem with incorrect ECMP behavior exi=
sts, but it is different from your description in your earlier email:
>
>
>
> Any LSR on the path between ingress and egress LER is free to look beyond=
 the MPLS label stack and misinterpret the 0x00 0x00 at the start of a cont=
rol-word as a valid MAC that starts 00:00:XX:XX:XX:XX and try to hash on Et=
hernet headers starting directly after the MPLS label stack.
>
>
>
> I have not seen (or heard about) such behavior in any deployed networks.
>
>
>
> However, I am aware of some modern forwarding chipsets that (correctly) t=
reat the =E2=80=980000=E2=80=99 in the first nibble of the payload of a lab=
eled packet (i.e., immediately following the bottom of the label stack) as =
the indication of a 32-bit PW control word but (incorrectly), consider this=
 as a CW of an Ethernet PW (as if no other PWs exist!) and try to hash on t=
he presumed MAC addresses, Ethertype etc.  Such behavior is really deadly f=
or, say TDM PWs that, AFAIK, are still widely deployed in many places.
>

Hi Sasha,

Well in either case we have both provided different examples of when
the PWMCW doesn't prevent reordering when ECMP is present in the PSN.
Perhaps I need to actually step back a bit here and ask a different
question, to further understand the non-technical problem first.

What is the scope/remit of the WG in this scenario? To be clear on
what I mean by this, the PWMCW is a flawed method for preventing
reordering when ECMP is present (see our two examples above). It also
doesn't add any entropy to improve ECMP when ECMP is required. Entropy
labels help to prevent reordering and help to add entropy, despite
these technical benefits but they may have other non-technical
disadvantages. So what is the WGs remit with recommending one
technology over another?

In this specific case, is it:

Option 1. The WG's remit is to phase out or discourage flawed
technologies if a superior one exists, so it should look to deprecate
CWs because ELs are superior from a purely technical view?
Option 2. The WG's remit is to support as many technologies as
possible, so it shouldn't look to deprecate CWs because ELs may have
other non-technical draw backs?
Option 3. The WG's remit is to remain neutral on the subject of CWs vs
other methods, and simply ensure that all drafts follow the correct
due diligence process regardless of whether one technology is
technically "better" than another?
Option 4. The WG's remit is something else?

Cheers,
James.


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From: Greg Mirsky <gregimirsky@gmail.com>
Date: Mon, 29 Oct 2018 11:51:59 -0700
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Subject: [bess] Multicast VPN fast upstream failover is ready for the WG LC
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--000000000000e909610579629025
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Dear BESS WG Chairs, et al.,
please kindly consider the WG LC call on draft-ietf-bess-mvpn-fast-failover
.

Regards,
Greg

--000000000000e909610579629025
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<div dir="ltr">Dear BESS WG Chairs, et al.,<div>please kindly consider the WG LC call on draft-ietf-bess-mvpn-fast-failover .</div><div><br></div><div>Regards,</div><div>Greg</div></div>

--000000000000e909610579629025--


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From: "Yutianpeng (Tim)" <yutianpeng@huawei.com>
To: James Bensley <jwbensley@gmail.com>, "bess@ietf.org" <bess@ietf.org>, "pals@ietf.org" <pals@ietf.org>
Thread-Topic: [bess] CW in EVPN: Was Signaling Control Word in EVPN
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From: <stephane.litkowski@orange.com>
To: "bess@ietf.org" <bess@ietf.org>
Thread-Topic: WG adoption poll for draft-zzhang-bess-mvpn-evpn-aggregation-label-01
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Date: Tue, 30 Oct 2018 08:22:00 +0000
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Subject: [bess] WG adoption poll for draft-zzhang-bess-mvpn-evpn-aggregation-label-01
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Hi WG,

This email begins a two-week poll for BESS working group adoption draft-zzh=
ang-bess-mvpn-evpn-aggregation-label-01 [1]

Please review the draft and post any comments to the BESS working group lis=
t, stating whether or not you support adoption.

We are also polling for knowledge of any undisclosed IPR that applies to th=
is 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 re=
spond to this email and indicate whether or not you are aware of any releva=
nt undisclosed IPR, copying the BESS mailing list. The document won't progr=
ess without answers from all the authors and contributors.

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 i=
n conformance with IETF rules.

The poll for working group adoption closes on Tue 13th November.

Regards,
St=E9phane and Matthew

[1] https://datatracker.ietf.org/doc/draft-zzhang-bess-mvpn-evpn-aggregatio=
n-label/





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https://datatracker.ietf.org/doc/draft-zzhang-bess-mvpn-evpn-aggregation-la=
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From: Greg Mirsky <gregimirsky@gmail.com>
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Subject: [bess] Proposed updates to address comments to draft-ietf-bess-mvpn-fast-failover
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Dear Ali,
my sincere apologies for being so terribly late to address your comments at
the BESS WG meeting in Montreal. Below are the updates I propose:
OLD TEXT:
  Then The Downstream PE MAY
   initiate a switchover of the traffic from the Primary Upstream PE to
   the Standby Upstream PE.
NEW TEXT:
  Then The Downstream PE MAY
   initiate a switchover of the traffic from the Primary Upstream PE to
   the Standby Upstream PE only if the Standby Upstream PE deemed
   available.  The dedicated p2mp BFD session MAY monitor the state of
   the Standby Upstream PE.

OLD TEXT:
   Whenever the state of the BFD session changes to Down the Provider
   Tunnel will be considered down, and the downstream PE will switch to
   the backup Provider Tunnel.
NEW TEXT:
   Whenever the state of the BFD session changes to Down the Provider
   Tunnel will be considered down, and the downstream PE MAY switch to
   the backup Provider Tunnel only if the backup Provider Tunnel deemed
   available.  The dedicated p2mp BFD session MAY monitor the state of
   the backup Provider Tunnel.

Attached please find diff to highlight the update and the new version of
the draft.

Kind regards,
Greg

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<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div di=
r=3D"ltr">Dear Ali,<div>my sincere apologies for being so terribly late to =
address your comments at the BESS WG meeting in Montreal. Below are=C2=A0th=
e updates I propose:</div><div>OLD TEXT:</div><div><div>=C2=A0 Then The Dow=
nstream PE MAY</div><div>=C2=A0 =C2=A0initiate a switchover of the traffic =
from the Primary Upstream PE to</div><div>=C2=A0 =C2=A0the Standby Upstream=
 PE.</div></div><div>NEW TEXT:</div><div><div>=C2=A0 Then The Downstream PE=
 MAY</div><div>=C2=A0 =C2=A0initiate a switchover of the traffic from the P=
rimary Upstream PE to</div><div>=C2=A0 =C2=A0the Standby Upstream PE only i=
f the Standby Upstream PE deemed</div><div>=C2=A0 =C2=A0available.=C2=A0 Th=
e dedicated p2mp BFD session MAY monitor the state of</div><div>=C2=A0 =C2=
=A0the Standby Upstream PE.</div></div><div><br></div><div>OLD TEXT:</div><=
div><div>=C2=A0 =C2=A0Whenever the state of the BFD session changes to Down=
 the Provider</div><div>=C2=A0 =C2=A0Tunnel will be considered down, and th=
e downstream PE will switch to</div><div>=C2=A0 =C2=A0the backup Provider T=
unnel.</div></div><div>NEW TEXT:</div><div><div>=C2=A0 =C2=A0Whenever the s=
tate of the BFD session changes to Down the Provider</div><div>=C2=A0 =C2=
=A0Tunnel will be considered down, and the downstream PE MAY switch to</div=
><div>=C2=A0 =C2=A0the backup Provider Tunnel only if the backup Provider T=
unnel deemed</div><div>=C2=A0 =C2=A0available.=C2=A0 The dedicated p2mp BFD=
 session MAY monitor the state of</div><div>=C2=A0 =C2=A0the backup Provide=
r Tunnel.=C2=A0=C2=A0</div></div><div><br></div><div>Attached please find d=
iff=C2=A0to highlight the update and the new version of the draft.=C2=A0<br=
><div><br></div></div><div>Kind regards,</div><div>Greg</div></div></div></=
div></div></div>

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From: Linda Dunbar <linda.dunbar@huawei.com>
To: "idr@ietf.org" <idr@ietf.org>, "bess@ietf.org" <bess@ietf.org>
Thread-Topic: Comparing using the SD-WAN Overlay SAFI specified by draft-dunbar-idr-bgp-sdwan-overlay-ext with the EVPN approach described by draft-sajassi-bess-secure-evpn-00
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Date: Tue, 30 Oct 2018 16:18:52 +0000
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Subject: [bess] Comparing using the SD-WAN Overlay SAFI specified by draft-dunbar-idr-bgp-sdwan-overlay-ext with the EVPN approach described by draft-sajassi-bess-secure-evpn-00
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IDR group, BESS group,

https://datatracker.ietf.org/doc/draft-dunbar-idr-bgp-sdwan-overlay-ext/ sp=
ecifies a new BGP SAFI (=3D74) in order to advertise a SD-WAN edge node's c=
apabilities in establishing SD-WAN overlay tunnels with other SD-WAN nodes =
through third party untrusted networks.

draft-sajassi-bess-secure-evpn-00 describes an EVPN solution for PE nodes t=
o exchange key and policy to create private pair-wise IPsec Security Associ=
ations without IKEv2 point-to-point signaling or any other direct peer-to-p=
eer session establishment messages.

I think those two solutions are not conflicting with each other. Actually t=
hey are compliment to each other to some degree. For example,

-        the Re-key mechanism described by draft-sajassi-bess-secure-evpn-0=
0 can be utilized by draft-dunbar-idr-bgp-sdwan-overlay-ext

-        The SD-WAN Overlay SAFI can be useful to simplify the process on R=
R to re-distribute the Tunnel End properties to authorized peers.

-        When SD-WAN edge nodes use private address, or no IP address, NAT =
properties for the end points distribution described draft-dunbar-idr-bgp-s=
dwan-overlay-ext is necessary.

-        The secure channel between SD-WAN edge nodes and RR described by d=
raft-dunbar-idr-bgp-sdwan-overlay-ext is necessary.

Any thoughts?

Thank you very much.

Linda Dunbar

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<p class=3D"MsoNormal">IDR group, BESS group,<o:p></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-du=
nbar-idr-bgp-sdwan-overlay-ext/">https://datatracker.ietf.org/doc/draft-dun=
bar-idr-bgp-sdwan-overlay-ext/</a> specifies a new BGP SAFI (=3D74) in orde=
r to advertise a SD-WAN edge node&#8217;s capabilities
 in establishing SD-WAN overlay tunnels with other SD-WAN nodes through thi=
rd party untrusted networks.
<o:p></o:p></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"text-autospace:none">draft-sajassi-bess-sec=
ure-evpn-00 describes an EVPN solution for PE nodes to exchange key and pol=
icy to create private pair-wise IPsec Security Associations without IKEv2 p=
oint-to-point signaling or any other
 direct peer-to-peer session establishment messages. <o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"text-autospace:none"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"text-autospace:none">I think those two solu=
tions are not conflicting with each other. Actually they are compliment to =
each other to some degree. For example,
<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1;text-autospace:none">
<![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=3D"font:7=
.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;
</span></span><![endif]>the Re-key mechanism described by draft-sajassi-bes=
s-secure-evpn-00 can be utilized by draft-dunbar-idr-bgp-sdwan-overlay-ext =
&nbsp;<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1;text-autospace:none">
<![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=3D"font:7=
.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;
</span></span><![endif]>The SD-WAN Overlay SAFI can be useful to simplify t=
he process on RR to re-distribute the Tunnel End properties to authorized p=
eers.
<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1;text-autospace:none">
<![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=3D"font:7=
.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;
</span></span><![endif]>When SD-WAN edge nodes use private address, or no I=
P address, NAT properties for the end points distribution described draft-d=
unbar-idr-bgp-sdwan-overlay-ext is necessary.
<o:p></o:p></p>
<p class=3D"MsoListParagraph" style=3D"text-indent:-.25in;mso-list:l0 level=
1 lfo1;text-autospace:none">
<![if !supportLists]><span style=3D"mso-list:Ignore">-<span style=3D"font:7=
.0pt &quot;Times New Roman&quot;">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp=
;
</span></span><![endif]>The secure channel between SD-WAN edge nodes and RR=
 described by draft-dunbar-idr-bgp-sdwan-overlay-ext is necessary.
<o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"text-autospace:none"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"text-autospace:none">Any thoughts? <o:p></o=
:p></p>
<p class=3D"MsoNormal" style=3D"text-autospace:none"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"text-autospace:none">Thank you very much. <=
o:p></o:p></p>
<p class=3D"MsoNormal" style=3D"text-autospace:none"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal" style=3D"text-autospace:none">Linda Dunbar<o:p></o:p=
></p>
</div>
</body>
</html>

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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: "stephane.litkowski@orange.com" <stephane.litkowski@orange.com>, "bess@ietf.org" <bess@ietf.org>
Thread-Topic: WG adoption poll for draft-zzhang-bess-mvpn-evpn-aggregation-label-01
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Date: Wed, 31 Oct 2018 00:27:03 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/F1OIZd4qSwVfpQg6D_q8RCx2XFY>
Subject: Re: [bess] WG adoption poll for draft-zzhang-bess-mvpn-evpn-aggregation-label-01
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Support, as co-author J

I am not aware of any related IPR.

Jeffrey

From: BESS <bess-bounces@ietf.org> On Behalf Of stephane.litkowski@orange.c=
om
Sent: Tuesday, October 30, 2018 4:22 PM
To: bess@ietf.org
Subject: [bess] WG adoption poll for draft-zzhang-bess-mvpn-evpn-aggregatio=
n-label-01

Hi WG,

This email begins a two-week poll for BESS working group adoption draft-zzh=
ang-bess-mvpn-evpn-aggregation-label-01 [1]

Please review the draft and post any comments to the BESS working group lis=
t, stating whether or not you support adoption.

We are also polling for knowledge of any undisclosed IPR that applies to th=
is 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 re=
spond to this email and indicate whether or not you are aware of any releva=
nt undisclosed IPR, copying the BESS mailing list. The document won't progr=
ess without answers from all the authors and contributors.

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 i=
n conformance with IETF rules.

The poll for working group adoption closes on Tue 13th November.

Regards,
St=E9phane and Matthew

[1] https://datatracker.ietf.org/doc/draft-zzhang-bess-mvpn-evpn-aggregatio=
n-label/<https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__datatracker=
.ietf.org_doc_draft-2Dzzhang-2Dbess-2Dmvpn-2Devpn-2Daggregation-2Dlabel_&d=
=3DDwMFAw&c=3DHAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=3Df7wsLGcfzAWDN=
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zzM&s=3DT2URivCmvLJZhTuf2fIu14qRY98gdLp4gtDs_T9uBhU&e=3D>





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Stephane Litkowski
Network Architect
Orange/SCE/EQUANT/OINIS/NET
Orange Expert Future Networks
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___________________________________________________________________________=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" Priority=3D"39" SemiHidden=3D"true" Unhide=
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<w:LsdException Locked=3D"false" Priority=3D"39" SemiHidden=3D"true" Unhide=
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<w:LsdException Locked=3D"false" Priority=3D"39" SemiHidden=3D"true" Unhide=
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<w:LsdException Locked=3D"false" Priority=3D"39" SemiHidden=3D"true" Unhide=
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<w:LsdException Locked=3D"false" Priority=3D"39" SemiHidden=3D"true" Unhide=
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<w:LsdException Locked=3D"false" Priority=3D"39" SemiHidden=3D"true" Unhide=
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<w:LsdException Locked=3D"false" Priority=3D"39" SemiHidden=3D"true" Unhide=
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<w:LsdException Locked=3D"false" Priority=3D"39" SemiHidden=3D"true" Unhide=
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<w:LsdException Locked=3D"false" Priority=3D"39" SemiHidden=3D"true" Unhide=
WhenUsed=3D"true" Name=3D"toc 9"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"Normal Indent"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"annotation text"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"header"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"footer"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"index heading"/>
<w:LsdException Locked=3D"false" Priority=3D"35" SemiHidden=3D"true" Unhide=
WhenUsed=3D"true" QFormat=3D"true" Name=3D"caption"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"table of figures"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"envelope return"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"annotation reference"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"line number"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"endnote reference"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"macro"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"toa heading"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"List"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"List Bullet"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"List Number 5"/>
<w:LsdException Locked=3D"false" Priority=3D"10" QFormat=3D"true" Name=3D"T=
itle"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"Closing"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"Signature"/>
<w:LsdException Locked=3D"false" Priority=3D"1" SemiHidden=3D"true" UnhideW=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"List Continue 3"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"Message Header"/>
<w:LsdException Locked=3D"false" Priority=3D"11" QFormat=3D"true" Name=3D"S=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"Date"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"Body Text First Indent"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"Note Heading"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"Block Text"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"Hyperlink"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"FollowedHyperlink"/>
<w:LsdException Locked=3D"false" Priority=3D"22" QFormat=3D"true" Name=3D"S=
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<w:LsdException Locked=3D"false" Priority=3D"20" QFormat=3D"true" Name=3D"E=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"Plain Text"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"E-mail Signature"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"HTML Top of Form"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"HTML Acronym"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"HTML Cite"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
" Name=3D"HTML Code"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" Priority=3D"39" Name=3D"Table Grid"/>
<w:LsdException Locked=3D"false" SemiHidden=3D"true" UnhideWhenUsed=3D"true=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" Name=3D"Placeholder Te=
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<w:LsdException Locked=3D"false" Priority=3D"1" QFormat=3D"true" Name=3D"No=
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<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List"/>
<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid"/>
<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading 1"/=
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<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading 2"/=
>
<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1"/>
<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2"/>
<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2"/>
<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful Shading"/=
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<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List"/>
<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid"/>
<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading Acce=
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<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List Accent =
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<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid Accent =
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<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading 1 A=
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<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading 2 A=
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<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 Acce=
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<w:LsdException Locked=3D"false" SemiHidden=3D"true" Name=3D"Revision"/>
<w:LsdException Locked=3D"false" Priority=3D"34" QFormat=3D"true" Name=3D"L=
ist Paragraph"/>
<w:LsdException Locked=3D"false" Priority=3D"29" QFormat=3D"true" Name=3D"Q=
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<w:LsdException Locked=3D"false" Priority=3D"30" QFormat=3D"true" Name=3D"I=
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<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List Accent 1=
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<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful Shading A=
ccent 1"/>
<w:LsdException Locked=3D"false" Priority=3D"72" Name=3D"Colorful List Acce=
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<w:LsdException Locked=3D"false" Priority=3D"73" Name=3D"Colorful Grid Acce=
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<w:LsdException Locked=3D"false" Priority=3D"60" Name=3D"Light Shading Acce=
nt 2"/>
<w:LsdException Locked=3D"false" Priority=3D"61" Name=3D"Light List Accent =
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<w:LsdException Locked=3D"false" Priority=3D"62" Name=3D"Light Grid Accent =
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<w:LsdException Locked=3D"false" Priority=3D"63" Name=3D"Medium Shading 1 A=
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<w:LsdException Locked=3D"false" Priority=3D"64" Name=3D"Medium Shading 2 A=
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<w:LsdException Locked=3D"false" Priority=3D"65" Name=3D"Medium List 1 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"66" Name=3D"Medium List 2 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"67" Name=3D"Medium Grid 1 Acce=
nt 2"/>
<w:LsdException Locked=3D"false" Priority=3D"68" Name=3D"Medium Grid 2 Acce=
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<w:LsdException Locked=3D"false" Priority=3D"69" Name=3D"Medium Grid 3 Acce=
nt 2"/>
<w:LsdException Locked=3D"false" Priority=3D"70" Name=3D"Dark List Accent 2=
"/>
<w:LsdException Locked=3D"false" Priority=3D"71" Name=3D"Colorful Shading A=
ccent 2"/>
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<body lang=3D"EN-US" link=3D"blue" vlink=3D"purple" style=3D"tab-interval:.=
5in">
<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;mso-bidi-font-size:1=
1.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-=
font-family:&quot;Times New Roman&quot;;color:#1F497D">Support, as co-autho=
r
</span><span style=3D"font-size:12.0pt;mso-bidi-font-size:11.0pt;font-famil=
y:Wingdings;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso=
-bidi-font-family:&quot;Times New Roman&quot;;color:#1F497D;mso-char-type:s=
ymbol;mso-symbol-font-family:Wingdings"><span style=3D"mso-char-type:symbol=
;mso-symbol-font-family:Wingdings">J</span></span><span style=3D"font-size:=
12.0pt;mso-bidi-font-size:11.0pt;mso-ascii-font-family:Calibri;mso-hansi-fo=
nt-family:Calibri;mso-bidi-font-family:&quot;Times New Roman&quot;;color:#1=
F497D"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;mso-bidi-font-size:1=
1.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-=
font-family:&quot;Times New Roman&quot;;color:#1F497D"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;mso-bidi-font-size:1=
1.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-=
font-family:&quot;Times New Roman&quot;;color:#1F497D">I am not aware of an=
y related IPR.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;mso-bidi-font-size:1=
1.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-=
font-family:&quot;Times New Roman&quot;;color:#1F497D"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;mso-bidi-font-size:1=
1.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-=
font-family:&quot;Times New Roman&quot;;color:#1F497D">Jeffrey<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;mso-bidi-font-size:1=
1.0pt;mso-ascii-font-family:Calibri;mso-hansi-font-family:Calibri;mso-bidi-=
font-family:&quot;Times New Roman&quot;;color:#1F497D"><o:p>&nbsp;</o:p></s=
pan></p>
<div style=3D"border:none;border-left:solid blue 1.5pt;padding:0in 0in 0in =
4.0pt">
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in =
0in 0in">
<p class=3D"MsoNormal"><b><span style=3D"mso-fareast-font-family:&quot;Time=
s New Roman&quot;">From:</span></b><span style=3D"mso-fareast-font-family:&=
quot;Times New Roman&quot;"> BESS &lt;bess-bounces@ietf.org&gt;
<b>On Behalf Of </b>stephane.litkowski@orange.com<br>
<b>Sent:</b> Tuesday, October 30, 2018 4:22 PM<br>
<b>To:</b> bess@ietf.org<br>
<b>Subject:</b> [bess] WG adoption poll for draft-zzhang-bess-mvpn-evpn-agg=
regation-label-01<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black;mso-ansi-l=
anguage:EN-GB">Hi WG,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black;mso-ansi-l=
anguage:EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black;mso-ansi-l=
anguage:EN-GB">This email begins a two-week poll for BESS working group ado=
ption draft-zzhang-bess-mvpn-evpn-aggregation-label-01 [1]<o:p></o:p></span=
></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black;mso-ansi-l=
anguage:EN-GB">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black;mso-ansi-l=
anguage:EN-GB">Please review the draft and post any comments to the BESS wo=
rking group list, stating whether or not you support adoption.<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black;mso-ansi-l=
anguage:EN-GB">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black;mso-ansi-l=
anguage:EN-GB">We are also polling for knowledge of any undisclosed IPR tha=
t applies to this Document, to ensure that IPR has been disclosed in compli=
ance with IETF IPR rules (see RFCs 3979,
 4879, 3669 and 5378 for more details).<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black;mso-ansi-l=
anguage:EN-GB">If you are listed as an author or a contributor of this docu=
ment, please respond to this email and indicate whether or not you are awar=
e of any relevant undisclosed IPR, copying
 the BESS mailing list. The document won't progress without answers from al=
l the authors and contributors.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black;mso-ansi-l=
anguage:EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black;mso-ansi-l=
anguage:EN-GB">If you are not listed as an author or a contributor, then pl=
ease explicitly respond only if you are aware of any IPR that has not yet b=
een disclosed in conformance with IETF
 rules.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black;mso-ansi-l=
anguage:EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black;mso-ansi-l=
anguage:EN-GB">The poll for working group adoption closes on Tue 13<sup>th<=
/sup> November. &nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black;mso-ansi-l=
anguage:EN-GB">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black;mso-ansi-l=
anguage:EN-GB">Regards,<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black;mso-ansi-l=
anguage:EN-GB">St=E9phane and Matthew<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B">[1] <a href=3D"https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__da=
tatracker.ietf.org_doc_draft-2Dzzhang-2Dbess-2Dmvpn-2Devpn-2Daggregation-2D=
label_&amp;d=3DDwMFAw&amp;c=3DHAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&a=
mp;r=3Df7wsLGcfzAWDNS6XNTBZwj_OLAOsZZqdrR2IDAzeZqE&amp;m=3DmtG0gvhpMa29xXml=
NP1ZHWRucZ3rVypx95b0JQoVzzM&amp;s=3DT2URivCmvLJZhTuf2fIu14qRY98gdLp4gtDs_T9=
uBhU&amp;e=3D">
https://datatracker.ietf.org/doc/draft-zzhang-bess-mvpn-evpn-aggregation-la=
bel/</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"mso-ansi-language:EN-G=
B"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ti=
mes New Roman&quot;,serif"><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;,serif"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><a href=3D"https://urldefense.proofpoint.com/v2/url?=
u=3Dhttp-3A__www.orange.com_&amp;d=3DDwMFAw&amp;c=3DHAkYuh63rsuhr6Scbfh0UjB=
XeMK-ndb3voDTXcWzoCI&amp;r=3Df7wsLGcfzAWDNS6XNTBZwj_OLAOsZZqdrR2IDAzeZqE&am=
p;m=3DmtG0gvhpMa29xXmlNP1ZHWRucZ3rVypx95b0JQoVzzM&amp;s=3Dd1odNxoKwGVbqLE-8=
zjHJ2oTsWw9xXPJqRCIQVmqCVs&amp;e=3D"><span style=3D"font-size:12.0pt;font-f=
amily:&quot;Times New Roman&quot;,serif;text-decoration:none;text-underline=
:none"><img border=3D"0" width=3D"40" height=3D"40" id=3D"Picture_x0020_1" =
src=3D"cid:image001.jpg@01D470B0.34FBF6F0" alt=3D"Orange logo"></span></a><=
span lang=3D"FR" style=3D"font-size:12.0pt;font-family:&quot;Times New Roma=
n&quot;,serif;mso-ansi-language:FR"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:15.0pt"><span style=3D"font-siz=
e:12.0pt;font-family:&quot;Times New Roman&quot;,serif">&nbsp;<o:p></o:p></=
span></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Arial&quot;,sans-serif;color:black">Stephane Litkowski
</span></b><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roma=
n&quot;,serif"><br>
</span><span style=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,sans-s=
erif;color:black">Network Architect
</span><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&qu=
ot;,serif"><br>
</span><span style=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,sans-s=
erif;color:black">Orange/SCE/EQUANT/OINIS/NET</span><span style=3D"font-siz=
e:12.0pt;font-family:&quot;Times New Roman&quot;,serif"><o:p></o:p></span><=
/p>
<p class=3D"MsoNormal"><span lang=3D"FR" style=3D"font-size:10.0pt;font-fam=
ily:&quot;Arial&quot;,sans-serif;color:black;mso-ansi-language:FR">Orange E=
xpert Future Networks</span><span lang=3D"FR" style=3D"font-size:12.0pt;fon=
t-family:&quot;Times New Roman&quot;,serif;mso-ansi-language:FR"><o:p></o:p=
></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR" style=3D"font-size:10.0pt;font-fam=
ily:&quot;Arial&quot;,sans-serif;color:black;mso-ansi-language:FR">phone:
<a href=3D"https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__monsi.sso=
.francetelecom.fr_index.asp-3Ftarget-3Dhttp-253A-252F-252Fclicvoice.sso.fra=
ncetelecom.fr-252FClicvoiceV2-252FToolBar.do-253Faction-253Ddefault-2526roo=
tservice-253DSIGNATURE-2526to-253D-2B33-25202-252023-252028-252049-252083-2=
520&amp;d=3DDwMFAw&amp;c=3DHAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&amp;=
r=3Df7wsLGcfzAWDNS6XNTBZwj_OLAOsZZqdrR2IDAzeZqE&amp;m=3DmtG0gvhpMa29xXmlNP1=
ZHWRucZ3rVypx95b0JQoVzzM&amp;s=3DEse4udR9KJKrPTNTzTV7Im--3IPQrQJg1f7UEtAns7=
A&amp;e=3D">
<span style=3D"color:black">&#43;33 2 23 <b>06</b> 49 83 </span></a>&nbsp;N=
EW&nbsp;!</span><span lang=3D"FR" style=3D"font-size:12.0pt;font-family:&qu=
ot;Times New Roman&quot;,serif;mso-ansi-language:FR"><br>
</span><span lang=3D"FR" style=3D"font-size:10.0pt;font-family:&quot;Arial&=
quot;,sans-serif;color:black;mso-ansi-language:FR">mobile:
<a href=3D"https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__monsi.sso=
.francetelecom.fr_index.asp-3Ftarget-3Dhttp-253A-252F-252Fclicvoice.sso.fra=
ncetelecom.fr-252FClicvoiceV2-252FToolBar.do-253Faction-253Ddefault-2526roo=
tservice-253DSIGNATURE-2526to-253D-2B33-25206-252037-252086-252097-252052-2=
520&amp;d=3DDwMFAw&amp;c=3DHAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&amp;=
r=3Df7wsLGcfzAWDNS6XNTBZwj_OLAOsZZqdrR2IDAzeZqE&amp;m=3DmtG0gvhpMa29xXmlNP1=
ZHWRucZ3rVypx95b0JQoVzzM&amp;s=3D5nDORUIcNgAcMNzTX5rCug6W8vJOxxEollWWqVkgYe=
4&amp;e=3D">
<span style=3D"color:black">&#43;33 6 71 63 27 50 </span></a>&nbsp;NEW&nbsp=
;!</span><span lang=3D"FR" style=3D"font-size:12.0pt;font-family:&quot;Time=
s New Roman&quot;,serif;mso-ansi-language:FR"><br>
<a href=3D"mailto:stephane.litkowski@orange.com"><span style=3D"font-size:1=
0.0pt;font-family:&quot;Arial&quot;,sans-serif;color:#FF6600">stephane.litk=
owski@orange.com</span></a>
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre>______________________________________________________________________=
___________________________________________________<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
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<pre>Orange decline toute responsabilite si ce message a ete altere, deform=
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From: "IJsbrand Wijnands (iwijnand)" <iwijnand@cisco.com>
To: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
CC: "stephane.litkowski@orange.com" <stephane.litkowski@orange.com>, "bess@ietf.org" <bess@ietf.org>
Thread-Topic: [bess] WG adoption poll for draft-zzhang-bess-mvpn-evpn-aggregation-label-01
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Date: Wed, 31 Oct 2018 02:19:27 +0000
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Subject: Re: [bess] WG adoption poll for draft-zzhang-bess-mvpn-evpn-aggregation-label-01
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From: Jeff Tantsura <jefftant.ietf@gmail.com>
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To: stephane.litkowski@orange.com
Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/EhUcugJTHNGK9tLHU1Y8C3KulWs>
Subject: Re: [bess] WG adoption poll for draft-zzhang-bess-mvpn-evpn-aggregation-label-01
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Yes/support=20

Regards,
Jeff

> On Oct 30, 2018, at 01:22, <stephane.litkowski@orange.com> <stephane.litko=
wski@orange.com> wrote:
>=20
> Hi WG,
> =20
> This email begins a two-week poll for BESS working group adoption draft-zz=
hang-bess-mvpn-evpn-aggregation-label-01 [1]
> =20
> Please review the draft and post any comments to the BESS working group li=
st, stating whether or not you support adoption.
> =20
> We are also polling for knowledge of any undisclosed IPR that applies to t=
his Document, to ensure that IPR has been disclosed in compliance with IETF I=
PR 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 r=
espond to this email and indicate whether or not you are aware of any releva=
nt undisclosed IPR, copying the BESS mailing list. The document won't progre=
ss without answers from all the authors and contributors.
> =20
> If you are not listed as an author or a contributor, then please explicitl=
y respond only if you are aware of any IPR that has not yet been disclosed i=
n conformance with IETF rules.
> =20
> The poll for working group adoption closes on Tue 13th November. =20
> =20
> Regards,
> St=C3=A9phane and Matthew
> =20
> [1] https://datatracker.ietf.org/doc/draft-zzhang-bess-mvpn-evpn-aggregati=
on-label/
> =20
> =20
> =20
> =20
> =20
> <image001.jpg>
> =20
> Stephane Litkowski=20
> Network Architect=20
> Orange/SCE/EQUANT/OINIS/NET
> Orange Expert Future Networks
> phone: +33 2 23 06 49 83  NEW !
> mobile: +33 6 71 63 27 50  NEW !
> stephane.litkowski@orange.com
> =20
> __________________________________________________________________________=
_______________________________________________
>=20
> Ce message et ses pieces jointes peuvent contenir des informations confide=
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> Orange decline toute responsabilite si ce message a ete altere, deforme ou=
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>=20
> This message and its attachments may contain confidential or privileged in=
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> If you have received this email in error, please notify the sender and del=
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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">Yes/support&nbsp;<br><br><div id=3D"AppleMa=
ilSignature" dir=3D"ltr">Regards,<div>Jeff</div></div><div dir=3D"ltr"><br>O=
n Oct 30, 2018, at 01:22, &lt;<a href=3D"mailto:stephane.litkowski@orange.co=
m">stephane.litkowski@orange.com</a>&gt; &lt;<a href=3D"mailto:stephane.litk=
owski@orange.com">stephane.litkowski@orange.com</a>&gt; wrote:<br><br></div>=
<blockquote type=3D"cite"><div dir=3D"ltr">

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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">Hi WG,<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">This email=
 begins a two-week poll for BESS working group adoption draft-zzhang-bess-mv=
pn-evpn-aggregation-label-01 [1]<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">&nbsp;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">Please rev=
iew the draft and post any comments to the BESS working group list, stating w=
hether or not you support adoption.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">&nbsp;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">We are als=
o 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 (s=
ee RFCs 3979, 4879, 3669 and 5378 for
 more details).<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">If you are=
 listed as an author or a contributor of this document, please respond to th=
is email and indicate whether or not you are aware of any relevant undisclos=
ed IPR, copying the BESS mailing list.
 The document won't progress without answers from all the authors and contri=
butors.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">If you are=
 not listed as an author or a contributor, then please explicitly respond on=
ly if you are aware of any IPR that has not yet been disclosed in conformanc=
e with IETF rules.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black"><o:p>&nbsp=
;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">The poll f=
or working group adoption closes on Tue 13<sup>th</sup> November. &nbsp;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">&nbsp;<o:p=
></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">Regards,<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">St=C3=A9ph=
ane and Matthew<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">[1] <a href=3D"https://datatrack=
er.ietf.org/doc/draft-zzhang-bess-mvpn-evpn-aggregation-label/">
https://datatracker.ietf.org/doc/draft-zzhang-bess-mvpn-evpn-aggregation-lab=
el/</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Tim=
es 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;Tim=
es New Roman&quot;,&quot;serif&quot;"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><a href=3D"http://www.orange.com/"><span style=3D"fon=
t-size:12.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;;colo=
r:blue;text-decoration:none">&lt;image001.jpg&gt;</span></a><span lang=3D"FR=
" style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&quot;,&quot;se=
rif&quot;"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:15.0pt"><span style=3D"font-size=
:12.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;">&nbsp;<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot;=
Arial&quot;,&quot;sans-serif&quot;;color:black">Stephane Litkowski
</span></b><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman=
&quot;,&quot;serif&quot;"><br>
</span><span style=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;s=
ans-serif&quot;;color:black">Network Architect
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From: "Ali Sajassi (sajassi)" <sajassi@cisco.com>
To: Linda Dunbar <linda.dunbar@huawei.com>, "idr@ietf.org" <idr@ietf.org>, "bess@ietf.org" <bess@ietf.org>
Thread-Topic: [bess] Comparing using the SD-WAN Overlay SAFI specified by draft-dunbar-idr-bgp-sdwan-overlay-ext with the EVPN approach described by draft-sajassi-bess-secure-evpn-00
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From: "Mankamana Mishra (mankamis)" <mankamis@cisco.com>
To: "bess@ietf.org" <bess@ietf.org>
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Thread-Topic: IETF 103 BESS WG  final agenda has been posted , please send your slides
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From: "Mankamana Mishra (mankamis)" <mankamis@cisco.com>
To: "stephane.litkowski@orange.com" <stephane.litkowski@orange.com>, "bess@ietf.org" <bess@ietf.org>
Thread-Topic: [bess] WG adoption poll for draft-zzhang-bess-mvpn-evpn-aggregation-label-01
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From: "Rabadan, Jorge (Nokia - US/Mountain View)" <jorge.rabadan@nokia.com>
To: "stephane.litkowski@orange.com" <stephane.litkowski@orange.com>, "bess@ietf.org" <bess@ietf.org>
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Subject: Re: [bess] WG adoption poll for draft-zzhang-bess-mvpn-evpn-aggregation-label-01
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From: Robert Raszuk <rraszuk@gmail.com>
Date: Wed, 31 Oct 2018 13:50:22 +0100
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Subject: Re: [bess] WG adoption poll for draft-zzhang-bess-mvpn-evpn-aggregation-label-01
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Support

On Tue, Oct 30, 2018, 09:22 <stephane.litkowski@orange.com wrote:

> Hi WG,
>
>
>
> This email begins a two-week poll for BESS working group adoption
> draft-zzhang-bess-mvpn-evpn-aggregation-label-01 [1]
>
>
>
> Please review the draft and post any comments to the BESS working group
> list, stating whether or not you support adoption.
>
>
>
> 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, copying the BESS mailing list. The document won=
't
> progress without answers from all the authors and contributors.
>
>
>
> 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.
>
>
>
> The poll for working group adoption closes on Tue 13th November.
>
>
>
> Regards,
>
> St=C3=A9phane and Matthew
>
>
>
> [1]
> https://datatracker.ietf.org/doc/draft-zzhang-bess-mvpn-evpn-aggregation-=
label/
>
>
>
>
>
>
>
>
>
>
>
> [image: Orange logo] <http://www.orange.com/>
>
>
>
> *Stephane Litkowski *
> Network Architect
> Orange/SCE/EQUANT/OINIS/NET
>
> Orange Expert Future Networks
>
> phone: +33 2 23 *06* 49 83
> <https://monsi.sso.francetelecom.fr/index.asp?target=3Dhttp%3A%2F%2Fclicv=
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> mobile: +33 6 71 63 27 50
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ootservice%3DSIGNATURE%26to%3D+33%206%2037%2086%2097%2052%20>
>  NEW !
> stephane.litkowski@orange.com
>
>
>
> _________________________________________________________________________=
________________________________________________
>
> Ce message et ses pieces jointes peuvent contenir des informations confid=
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> pas etre diffuses, exploites ou copies sans autorisation. Si vous avez re=
cu ce message par erreur, veuillez le signaler
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> Orange decline toute responsabilite si ce message a ete altere, deforme o=
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>
> 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=
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> Thank you.
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> _______________________________________________
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> BESS@ietf.org
> https://www.ietf.org/mailman/listinfo/bess
>

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<div dir=3D"auto">Support=C2=A0</div><br><div class=3D"gmail_quote"><div di=
r=3D"ltr">On Tue, Oct 30, 2018, 09:22  &lt;<a href=3D"mailto:stephane.litko=
wski@orange.com">stephane.litkowski@orange.com</a> wrote:<br></div><blockqu=
ote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc s=
olid;padding-left:1ex">





<div lang=3D"EN-US" link=3D"blue" vlink=3D"purple">
<div class=3D"m_-3614218580221246710WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">Hi WG,<u>=
</u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black"><u></u>=
=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">This emai=
l begins a two-week poll for BESS working group adoption draft-zzhang-bess-=
mvpn-evpn-aggregation-label-01 [1]<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">=C2=A0<u>=
</u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">Please re=
view the draft and post any comments to the BESS working group list, statin=
g whether or not you support adoption.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">=C2=A0<u>=
</u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">We are al=
so polling for knowledge of any undisclosed IPR that applies to this Docume=
nt, to 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></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">If you ar=
e 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 undisc=
losed IPR, copying the BESS mailing list.
 The document won&#39;t progress without answers from all the authors and c=
ontributors.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black"><u></u>=
=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">If you ar=
e 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 conform=
ance with IETF rules.<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black"><u></u>=
=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">The poll =
for working group adoption closes on Tue 13<sup>th</sup> November. =C2=A0<u=
></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">=C2=A0<u>=
</u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">Regards,<=
u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">St=C3=A9p=
hane and Matthew<u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">[1] <a href=3D"https://datatrac=
ker.ietf.org/doc/draft-zzhang-bess-mvpn-evpn-aggregation-label/" target=3D"=
_blank" rel=3D"noreferrer">
https://datatracker.ietf.org/doc/draft-zzhang-bess-mvpn-evpn-aggregation-la=
bel/</a><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ti=
mes New Roman&quot;,&quot;serif&quot;"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ti=
mes New Roman&quot;,&quot;serif&quot;"><u></u>=C2=A0<u></u></span></p>
<p class=3D"MsoNormal"><a href=3D"http://www.orange.com/" target=3D"_blank"=
 rel=3D"noreferrer"><span style=3D"font-size:12.0pt;font-family:&quot;Times=
 New Roman&quot;,&quot;serif&quot;;color:blue;text-decoration:none"><img bo=
rder=3D"0" width=3D"40" height=3D"40" id=3D"m_-3614218580221246710Picture_x=
0020_1" src=3D"cid:image001.jpg@01D47032.02A5E810" alt=3D"Orange logo"></sp=
an></a><span lang=3D"FR" style=3D"font-size:12.0pt;font-family:&quot;Times =
New Roman&quot;,&quot;serif&quot;"><u></u><u></u></span></p>
<p class=3D"MsoNormal" style=3D"line-height:15.0pt"><span style=3D"font-siz=
e:12.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&quot;">=C2=A0<=
u></u><u></u></span></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Arial&quot;,&quot;sans-serif&quot;;color:black">Stephane Litkowski
</span></b><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roma=
n&quot;,&quot;serif&quot;"><br>
</span><span style=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;=
sans-serif&quot;;color:black">Network Architect
</span><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&qu=
ot;,&quot;serif&quot;"><br>
</span><span style=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;=
sans-serif&quot;;color:black">Orange/SCE/EQUANT/OINIS/NET</span><span style=
=3D"font-size:12.0pt;font-family:&quot;Times New Roman&quot;,&quot;serif&qu=
ot;"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR" style=3D"font-size:10.0pt;font-fam=
ily:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">Orange Expert Fut=
ure Networks</span><span lang=3D"FR" style=3D"font-size:12.0pt;font-family:=
&quot;Times New Roman&quot;,&quot;serif&quot;"><u></u><u></u></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR" style=3D"font-size:10.0pt;font-fam=
ily:&quot;Arial&quot;,&quot;sans-serif&quot;;color:black">phone:
<a href=3D"https://monsi.sso.francetelecom.fr/index.asp?target=3Dhttp%3A%2F=
%2Fclicvoice.sso.francetelecom.fr%2FClicvoiceV2%2FToolBar.do%3Faction%3Ddef=
ault%26rootservice%3DSIGNATURE%26to%3D+33%202%2023%2028%2049%2083%20" targe=
t=3D"_blank" rel=3D"noreferrer">
<span style=3D"color:black">+33 2 23 <b>06</b> 49 83 </span></a>=C2=A0NEW=
=C2=A0!</span><span lang=3D"FR" style=3D"font-size:12.0pt;font-family:&quot=
;Times New Roman&quot;,&quot;serif&quot;"><br>
</span><span lang=3D"FR" style=3D"font-size:10.0pt;font-family:&quot;Arial&=
quot;,&quot;sans-serif&quot;;color:black">mobile:
<a href=3D"https://monsi.sso.francetelecom.fr/index.asp?target=3Dhttp%3A%2F=
%2Fclicvoice.sso.francetelecom.fr%2FClicvoiceV2%2FToolBar.do%3Faction%3Ddef=
ault%26rootservice%3DSIGNATURE%26to%3D+33%206%2037%2086%2097%2052%20" targe=
t=3D"_blank" rel=3D"noreferrer">
<span style=3D"color:black">+33 6 71 63 27 50 </span></a>=C2=A0NEW=C2=A0!</=
span><span lang=3D"FR" style=3D"font-size:12.0pt;font-family:&quot;Times Ne=
w Roman&quot;,&quot;serif&quot;"><br>
<a href=3D"mailto:stephane.litkowski@orange.com" target=3D"_blank" rel=3D"n=
oreferrer"><span style=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&q=
uot;sans-serif&quot;;color:#ff6600">stephane.litkowski@orange.com</span></a=
>
<u></u><u></u></span></p>
<p class=3D"MsoNormal"><u></u>=C2=A0<u></u></p>
</div>
<pre>______________________________________________________________________=
___________________________________________________

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</pre></div>

_______________________________________________<br>
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<a href=3D"mailto:BESS@ietf.org" target=3D"_blank" rel=3D"noreferrer">BESS@=
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From: "UTTARO, JAMES" <ju1738@att.com>
To: Robert Raszuk <rraszuk@gmail.com>, "<stephane.litkowski@orange.com>" <stephane.litkowski@orange.com>
CC: "bess@ietf.org" <bess@ietf.org>
Thread-Topic: [bess] WG adoption poll for draft-zzhang-bess-mvpn-evpn-aggregation-label-01
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bess/BBTTGnEaQq3wUPLmL_mAbk2_pew>
Subject: Re: [bess] WG adoption poll for draft-zzhang-bess-mvpn-evpn-aggregation-label-01
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I am not aware of any relevant undisclosed IPR.


On 10/30/2018 4:22 AM, stephane.litkowski@orange.com<mailto:stephane.litkow=
ski@orange.com> wrote:
Hi WG,

This email begins a two-week poll for BESS working group adoption draft-zzh=
ang-bess-mvpn-evpn-aggregation-label-01 [1]

Please review the draft and post any comments to the BESS working group lis=
t, stating whether or not you support adoption.

We are also polling for knowledge of any undisclosed IPR that applies to th=
is 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 re=
spond to this email and indicate whether or not you are aware of any releva=
nt undisclosed IPR, copying the BESS mailing list. The document won't progr=
ess without answers from all the authors and contributors.

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 i=
n conformance with IETF rules.

The poll for working group adoption closes on Tue 13th November.

Regards,
St=E9phane and Matthew

[1] https://datatracker.ietf.org/doc/draft-zzhang-bess-mvpn-evpn-aggregatio=
n-label/<https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__datatracker=
.ietf.org_doc_draft-2Dzzhang-2Dbess-2Dmvpn-2Devpn-2Daggregation-2Dlabel_&d=
=3DDwMFAw&c=3DHAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=3D-DXB84eU9m4cI=
lq2OOcCJCQQAwJXQQswyu3F0kG0VNo&m=3DytiaqUZqDqVgLr4WYWfN-GUmT_N5YOih6vg--vec=
Wf8&s=3D-wtbcIrHhVw4ldQzh7-aq3EJt-Q8IVJDrEYuhPLPOLA&e=3D>





[Orange logo]<https://urldefense.proofpoint.com/v2/url?u=3Dhttp-3A__www.ora=
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ih6vg--vecWf8&s=3DifCTWxE-LfTcHAY0JqF64b58fRBQljeToqfYdvbqpfw&e=3D>

Stephane Litkowski
Network Architect
Orange/SCE/EQUANT/OINIS/NET
Orange Expert Future Networks
phone: +33 2 23 06 49 83 <https://urldefense.proofpoint.com/v2/url?u=3Dhttp=
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=3D>  NEW !
stephane.litkowski@orange.com<mailto:stephane.litkowski@orange.com>


___________________________________________________________________________=
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I am not aware of any relevant undisclosed IPR.<br>
<br>
<br>
<div class=3D"moz-cite-prefix">On 10/30/2018 4:22 AM, <a class=3D"moz-txt-l=
ink-abbreviated" href=3D"mailto:stephane.litkowski@orange.com">
stephane.litkowski@orange.com</a> wrote:<br>
</div>
<blockquote type=3D"cite" cite=3D"mid:12866_1540887721_5BD814A9_12866_117_1=
_9E32478DFA9976438E7A22F69B08FF924B735BC6@OPEXCLILMA4.corporate.adroot.infr=
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<p class=3D"MsoNormal"><span style=3D"color:black" lang=3D"EN-GB">Hi WG,<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black" lang=3D"EN-GB"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black" lang=3D"EN-GB">This emai=
l begins a two-week poll for BESS working group adoption draft-zzhang-bess-=
mvpn-evpn-aggregation-label-01 [1]<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black" lang=3D"EN-GB">&nbsp;<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black" lang=3D"EN-GB">Please re=
view the draft and post any comments to the BESS working group list, statin=
g whether or not you support adoption.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black" lang=3D"EN-GB">&nbsp;<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black" lang=3D"EN-GB">We are al=
so polling for knowledge of any undisclosed IPR that applies to this Docume=
nt, to ensure that IPR has been disclosed in compliance with IETF IPR rules=
 (see RFCs 3979, 4879, 3669 and 5378 for
 more details).<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black" lang=3D"EN-GB">If you ar=
e 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 undisc=
losed IPR, copying the BESS mailing list.
 The document won't progress without answers from all the authors and contr=
ibutors.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black" lang=3D"EN-GB"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black" lang=3D"EN-GB">If you ar=
e 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 conform=
ance with IETF rules.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black" lang=3D"EN-GB"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black" lang=3D"EN-GB">The poll =
for working group adoption closes on Tue 13<sup>th</sup> November. &nbsp;<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black" lang=3D"EN-GB">&nbsp;<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black" lang=3D"EN-GB">Regards,<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"color:black" lang=3D"EN-GB">St=E9phan=
e and Matthew<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">[1] <a href=3D"https://urldefen=
se.proofpoint.com/v2/url?u=3Dhttps-3A__datatracker.ietf.org_doc_draft-2Dzzh=
ang-2Dbess-2Dmvpn-2Devpn-2Daggregation-2Dlabel_&amp;d=3DDwMFAw&amp;c=3DHAkY=
uh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&amp;r=3D-DXB84eU9m4cIlq2OOcCJCQQAwJ=
XQQswyu3F0kG0VNo&amp;m=3DytiaqUZqDqVgLr4WYWfN-GUmT_N5YOih6vg--vecWf8&amp;s=
=3D-wtbcIrHhVw4ldQzh7-aq3EJt-Q8IVJDrEYuhPLPOLA&amp;e=3D" moz-do-not-send=3D=
"true">
https://datatracker.ietf.org/doc/draft-zzhang-bess-mvpn-evpn-aggregation-la=
bel/</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</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"><a href=3D"https://urldefense.proofpoint.com/v2/url?=
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p>
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e:12.0pt;font-family:&quot;Times New
            Roman&quot;,&quot;serif&quot;">&nbsp;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Arial&quot;,&quot;sans-serif&quot;;color:black">Stephane Litkowski
</span></b><span style=3D"font-size:12.0pt;font-family:&quot;Times New
            Roman&quot;,&quot;serif&quot;"><br>
</span><span style=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;=
sans-serif&quot;;color:black">Network Architect
</span><span style=3D"font-size:12.0pt;font-family:&quot;Times
            New Roman&quot;,&quot;serif&quot;"><br>
</span><span style=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;=
sans-serif&quot;;color:black">Orange/SCE/EQUANT/OINIS/NET</span><span style=
=3D"font-size:12.0pt;font-family:&quot;Times New
            Roman&quot;,&quot;serif&quot;"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,&quot;sans-serif&quot;;color:black" lang=3D"FR">Orange Expert Fut=
ure Networks</span><span style=3D"font-size:12.0pt;font-family:&quot;Times =
New
            Roman&quot;,&quot;serif&quot;" lang=3D"FR"><o:p></o:p></span></=
p>
<p class=3D"MsoNormal"><span style=3D"font-size:10.0pt;font-family:&quot;Ar=
ial&quot;,&quot;sans-serif&quot;;color:black" lang=3D"FR">phone:
<a href=3D"https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__monsi.sso=
.francetelecom.fr_index.asp-3Ftarget-3Dhttp-253A-252F-252Fclicvoice.sso.fra=
ncetelecom.fr-252FClicvoiceV2-252FToolBar.do-253Faction-253Ddefault-2526roo=
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w&amp;e=3D" moz-do-not-send=3D"true">
<span style=3D"color:black">&#43;33 2 23 <b>06</b> 49 83 </span></a>&nbsp;N=
EW&nbsp;!</span><span style=3D"font-size:12.0pt;font-family:&quot;Times New
            Roman&quot;,&quot;serif&quot;" lang=3D"FR"><br>
</span><span style=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;=
sans-serif&quot;;color:black" lang=3D"FR">mobile:
<a href=3D"https://urldefense.proofpoint.com/v2/url?u=3Dhttps-3A__monsi.sso=
.francetelecom.fr_index.asp-3Ftarget-3Dhttp-253A-252F-252Fclicvoice.sso.fra=
ncetelecom.fr-252FClicvoiceV2-252FToolBar.do-253Faction-253Ddefault-2526roo=
tservice-253DSIGNATURE-2526to-253D-2B33-25206-252037-252086-252097-252052-2=
520&amp;d=3DDwMFAw&amp;c=3DHAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&amp;=
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N-GUmT_N5YOih6vg--vecWf8&amp;s=3DTng8gfrOsXFXttkof3Ik-HykJqne7nCcKslwOFA3kb=
8&amp;e=3D" moz-do-not-send=3D"true">
<span style=3D"color:black">&#43;33 6 71 63 27 50 </span></a>&nbsp;NEW&nbsp=
;!</span><span style=3D"font-size:12.0pt;font-family:&quot;Times New
            Roman&quot;,&quot;serif&quot;" lang=3D"FR"><br>
<a href=3D"mailto:stephane.litkowski@orange.com" moz-do-not-send=3D"true"><=
span style=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,&quot;sans-ser=
if&quot;;color:#FF6600">stephane.litkowski@orange.com</span></a>
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<pre>______________________________________________________________________=
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<br>
<fieldset class=3D"mimeAttachmentHeader"></fieldset> <br>
<pre wrap=3D"">_______________________________________________
BESS mailing list
<a class=3D"moz-txt-link-abbreviated" href=3D"mailto:BESS@ietf.org">BESS@ie=
tf.org</a>
<a class=3D"moz-txt-link-freetext" href=3D"https://urldefense.proofpoint.co=
m/v2/url?u=3Dhttps-3A__www.ietf.org_mailman_listinfo_bess&amp;d=3DDwICAg&am=
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Wqg&amp;e=3D</a>
</pre>
</blockquote>
<br>
</body>
</html>

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From nobody Wed Oct 31 17:56:19 2018
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From: Liuyisong <liuyisong@huawei.com>
To: "stephane.litkowski@orange.com" <stephane.litkowski@orange.com>, "bess@ietf.org" <bess@ietf.org>
Thread-Topic: WG adoption poll for draft-zzhang-bess-mvpn-evpn-aggregation-label-01
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I support

Thanks
Yisong

From: BESS [mailto:bess-bounces@ietf.org] On Behalf Of stephane.litkowski@o=
range.com
Sent: Tuesday, October 30, 2018 4:22 PM
To: bess@ietf.org
Subject: [bess] WG adoption poll for draft-zzhang-bess-mvpn-evpn-aggregatio=
n-label-01

Hi WG,

This email begins a two-week poll for BESS working group adoption draft-zzh=
ang-bess-mvpn-evpn-aggregation-label-01 [1]

Please review the draft and post any comments to the BESS working group lis=
t, stating whether or not you support adoption.

We are also polling for knowledge of any undisclosed IPR that applies to th=
is 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 re=
spond to this email and indicate whether or not you are aware of any releva=
nt undisclosed IPR, copying the BESS mailing list. The document won't progr=
ess without answers from all the authors and contributors.

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 i=
n conformance with IETF rules.

The poll for working group adoption closes on Tue 13th November.

Regards,
St=E9phane and Matthew

[1] https://datatracker.ietf.org/doc/draft-zzhang-bess-mvpn-evpn-aggregatio=
n-label/





[Orange logo]<http://www.orange.com/>

Stephane Litkowski
Network Architect
Orange/SCE/EQUANT/OINIS/NET
Orange Expert Future Networks
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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">I support<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Thanks<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D">Yisong<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:10.5pt;color=
:#1F497D"><o:p>&nbsp;</o:p></span></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b><span lang=3D"EN-US">From:</span></b><span lang=
=3D"EN-US"> BESS [mailto:bess-bounces@ietf.org]
<b>On Behalf Of </b>stephane.litkowski@orange.com<br>
<b>Sent:</b> Tuesday, October 30, 2018 4:22 PM<br>
<b>To:</b> bess@ietf.org<br>
<b>Subject:</b> [bess] WG adoption poll for draft-zzhang-bess-mvpn-evpn-agg=
regation-label-01<o:p></o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">Hi WG,<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">This emai=
l begins a two-week poll for BESS working group adoption draft-zzhang-bess-=
mvpn-evpn-aggregation-label-01 [1]<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">&nbsp;<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">Please re=
view the draft and post any comments to the BESS working group list, statin=
g whether or not you support adoption.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">&nbsp;<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">We are al=
so polling for knowledge of any undisclosed IPR that applies to this Docume=
nt, to ensure that IPR has been disclosed in compliance with IETF IPR rules=
 (see RFCs 3979, 4879, 3669 and 5378 for
 more details).<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">If you ar=
e 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 undisc=
losed IPR, copying the BESS mailing list.
 The document won't progress without answers from all the authors and contr=
ibutors.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">If you ar=
e 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 conform=
ance with IETF rules.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">The poll =
for working group adoption closes on Tue 13<sup>th</sup> November. &nbsp;<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">&nbsp;<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">Regards,<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">St=E9phan=
e and Matthew<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">[1] <a href=3D"https://datatrac=
ker.ietf.org/doc/draft-zzhang-bess-mvpn-evpn-aggregation-label/">
https://datatracker.ietf.org/doc/draft-zzhang-bess-mvpn-evpn-aggregation-la=
bel/</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;Times New Roman&quot;,serif"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-=
family:&quot;Times New Roman&quot;,serif"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><a href=3D"http://www.orange.co=
m/"><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&quot;=
,serif;text-decoration:none"><img border=3D"0" width=3D"40" height=3D"40" i=
d=3D"Picture_x0020_1" src=3D"cid:image001.jpg@01D471C0.B89FD8D0" alt=3D"Ora=
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t-family:&quot;Times New Roman&quot;,serif"><o:p></o:p></span></p>
<p class=3D"MsoNormal" style=3D"line-height:15.0pt"><span lang=3D"EN-US" st=
yle=3D"font-size:12.0pt;font-family:&quot;Times New Roman&quot;,serif">&nbs=
p;<o:p></o:p></span></p>
<p class=3D"MsoNormal"><b><span lang=3D"EN-US" style=3D"font-size:10.0pt;fo=
nt-family:&quot;Arial&quot;,sans-serif;color:black">Stephane Litkowski
</span></b><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-family:&quot=
;Times New Roman&quot;,serif"><br>
</span><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Ari=
al&quot;,sans-serif;color:black">Network Architect
</span><span lang=3D"EN-US" style=3D"font-size:12.0pt;font-family:&quot;Tim=
es New Roman&quot;,serif"><br>
</span><span lang=3D"EN-US" style=3D"font-size:10.0pt;font-family:&quot;Ari=
al&quot;,sans-serif;color:black">Orange/SCE/EQUANT/OINIS/NET</span><span la=
ng=3D"EN-US" style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&qu=
ot;,serif"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR" style=3D"font-size:10.0pt;font-fam=
ily:&quot;Arial&quot;,sans-serif;color:black">Orange Expert Future Networks=
</span><span lang=3D"FR" style=3D"font-size:12.0pt;font-family:&quot;Times =
New Roman&quot;,serif"><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"FR" style=3D"font-size:10.0pt;font-fam=
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<a href=3D"https://monsi.sso.francetelecom.fr/index.asp?target=3Dhttp%3A%2F=
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</span><span lang=3D"FR" style=3D"font-size:10.0pt;font-family:&quot;Arial&=
quot;,sans-serif;color:black">mobile:
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<span style=3D"color:black">&#43;33 6 71 63 27 50 </span></a>&nbsp;NEW&nbsp=
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s New Roman&quot;,serif"><br>
<a href=3D"mailto:stephane.litkowski@orange.com"><span style=3D"font-size:1=
0.0pt;font-family:&quot;Arial&quot;,sans-serif;color:#FF6600">stephane.litk=
owski@orange.com</span></a>
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></p>
<pre><span lang=3D"EN-US">_________________________________________________=
________________________________________________________________________<o:=
p></o:p></span></pre>
<pre><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"EN-US">Ce message et ses pieces jointes peuvent contenir=
 des informations confidentielles ou privilegiees et ne doivent donc<o:p></=
o:p></span></pre>
<pre><span lang=3D"EN-US">pas etre diffuses, exploites ou copies sans autor=
isation. Si vous avez recu ce message par erreur, veuillez le signaler<o:p>=
</o:p></span></pre>
<pre><span lang=3D"EN-US">a l'expediteur et le detruire ainsi que les piece=
s jointes. Les messages electroniques etant susceptibles d'alteration,<o:p>=
</o:p></span></pre>
<pre><span lang=3D"EN-US">Orange decline toute responsabilite si ce message=
 a ete altere, deforme ou falsifie. Merci.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US"><o:p>&nbsp;</o:p></span></pre>
<pre><span lang=3D"EN-US">This message and its attachments may contain conf=
idential or privileged information that may be protected by law;<o:p></o:p>=
</span></pre>
<pre><span lang=3D"EN-US">they should not be distributed, used or copied wi=
thout authorisation.<o:p></o:p></span></pre>
<pre><span lang=3D"EN-US">If you have received this email in error, please =
notify the sender and delete this message and its attachments.<o:p></o:p></=
span></pre>
<pre><span lang=3D"EN-US">As emails may be altered, Orange is not liable fo=
r messages that have been modified, changed or falsified.<o:p></o:p></span>=
</pre>
<pre><span lang=3D"EN-US">Thank you.<o:p></o:p></span></pre>
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From: Zhuangshunwan <zhuangshunwan@huawei.com>
To: "stephane.litkowski@orange.com" <stephane.litkowski@orange.com>, "bess@ietf.org" <bess@ietf.org>
Thread-Topic: WG adoption poll for draft-zzhang-bess-mvpn-evpn-aggregation-label-01
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Subject: Re: [bess] WG adoption poll for draft-zzhang-bess-mvpn-evpn-aggregation-label-01
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Yes/support
Regards,
Shunwan


From: BESS [mailto:bess-bounces@ietf.org] On Behalf Of stephane.litkowski@o=
range.com
Sent: Tuesday, October 30, 2018 4:22 PM
To: bess@ietf.org
Subject: [bess] WG adoption poll for draft-zzhang-bess-mvpn-evpn-aggregatio=
n-label-01

Hi WG,

This email begins a two-week poll for BESS working group adoption draft-zzh=
ang-bess-mvpn-evpn-aggregation-label-01 [1]

Please review the draft and post any comments to the BESS working group lis=
t, stating whether or not you support adoption.

We are also polling for knowledge of any undisclosed IPR that applies to th=
is 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 re=
spond to this email and indicate whether or not you are aware of any releva=
nt undisclosed IPR, copying the BESS mailing list. The document won't progr=
ess without answers from all the authors and contributors.

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 i=
n conformance with IETF rules.

The poll for working group adoption closes on Tue 13th November.

Regards,
St=E9phane and Matthew

[1] https://datatracker.ietf.org/doc/draft-zzhang-bess-mvpn-evpn-aggregatio=
n-label/





[Orange logo]<http://www.orange.com/>

Stephane Litkowski
Network Architect
Orange/SCE/EQUANT/OINIS/NET
Orange Expert Future Networks
phone: +33 2 23 06 49 83 <https://monsi.sso.francetelecom.fr/index.asp?targ=
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%2083%20>  NEW !
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___________________________________________________________________________=
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<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt">Yes/support&nbsp;<spa=
n style=3D"font-size:12.0pt"><o:p></o:p></span></p>
<p class=3D"MsoNormal">Regards,<o:p></o:p></p>
<p class=3D"MsoNormal">Shunwan<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<p class=3D"MsoNormal"><span style=3D"color:#1F497D"><o:p>&nbsp;</o:p></spa=
n></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm =
0cm 0cm">
<p class=3D"MsoNormal"><b>From:</b> BESS [mailto:bess-bounces@ietf.org] <b>=
On Behalf Of
</b>stephane.litkowski@orange.com<br>
<b>Sent:</b> Tuesday, October 30, 2018 4:22 PM<br>
<b>To:</b> bess@ietf.org<br>
<b>Subject:</b> [bess] WG adoption poll for draft-zzhang-bess-mvpn-evpn-agg=
regation-label-01<o:p></o:p></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">Hi WG,<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">This emai=
l begins a two-week poll for BESS working group adoption draft-zzhang-bess-=
mvpn-evpn-aggregation-label-01 [1]<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">&nbsp;<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">Please re=
view the draft and post any comments to the BESS working group list, statin=
g whether or not you support adoption.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">&nbsp;<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">We are al=
so polling for knowledge of any undisclosed IPR that applies to this Docume=
nt, to ensure that IPR has been disclosed in compliance with IETF IPR rules=
 (see RFCs 3979, 4879, 3669 and 5378 for
 more details).<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">If you ar=
e 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 undisc=
losed IPR, copying the BESS mailing list.
 The document won't progress without answers from all the authors and contr=
ibutors.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">If you ar=
e 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 conform=
ance with IETF rules.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black"><o:p>&nbs=
p;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">The poll =
for working group adoption closes on Tue 13<sup>th</sup> November. &nbsp;<o=
:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">&nbsp;<o:=
p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">Regards,<=
o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB" style=3D"color:black">St=E9phan=
e and Matthew<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB">[1] <a href=3D"https://datatrac=
ker.ietf.org/doc/draft-zzhang-bess-mvpn-evpn-aggregation-label/">
https://datatracker.ietf.org/doc/draft-zzhang-bess-mvpn-evpn-aggregation-la=
bel/</a><o:p></o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><span lang=3D"EN-GB"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:12.0pt;font-family:&quot;Ti=
mes New Roman&quot;,serif"><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;,serif"><o:p>&nbsp;</o:p></span></p>
<p class=3D"MsoNormal"><a href=3D"http://www.orange.com/"><span style=3D"fo=
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<p class=3D"MsoNormal"><b><span style=3D"font-size:10.0pt;font-family:&quot=
;Arial&quot;,sans-serif;color:black">Stephane Litkowski
</span></b><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roma=
n&quot;,serif"><br>
</span><span style=3D"font-size:10.0pt;font-family:&quot;Arial&quot;,sans-s=
erif;color:black">Network Architect
</span><span style=3D"font-size:12.0pt;font-family:&quot;Times New Roman&qu=
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0.0pt;font-family:&quot;Arial&quot;,sans-serif;color:#FF6600">stephane.litk=
owski@orange.com</span></a>
<o:p></o:p></span></p>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<pre>______________________________________________________________________=
___________________________________________________<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>Ce message et ses pieces jointes peuvent contenir des informations con=
fidentielles ou privilegiees et ne doivent donc<o:p></o:p></pre>
<pre>pas etre diffuses, exploites ou copies sans autorisation. Si vous avez=
 recu ce message par erreur, veuillez le signaler<o:p></o:p></pre>
<pre>a l'expediteur et le detruire ainsi que les pieces jointes. Les messag=
es electroniques etant susceptibles d'alteration,<o:p></o:p></pre>
<pre>Orange decline toute responsabilite si ce message a ete altere, deform=
e ou falsifie. Merci.<o:p></o:p></pre>
<pre><o:p>&nbsp;</o:p></pre>
<pre>This message and its attachments may contain confidential or privilege=
d information that may be protected by law;<o:p></o:p></pre>
<pre>they should not be distributed, used or copied without authorisation.<=
o:p></o:p></pre>
<pre>If you have received this email in error, please notify the sender and=
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<pre>As emails may be altered, Orange is not liable for messages that have =
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<pre>Thank you.<o:p></o:p></pre>
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