Re: [Bier] WGLC: draft-ietf-bier-php

"Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net> Wed, 26 August 2020 11:17 UTC

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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: "Nagendra Kumar Nainar (naikumar)" <naikumar=40cisco.com@dmarc.ietf.org>, Greg Shepherd <gjshep@gmail.com>, "bier@ietf.org" <bier@ietf.org>
Thread-Topic: [Bier] WGLC: draft-ietf-bier-php
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bier/HwTGRSXwUtpt9QJ1kXG_G8-epZw>
Subject: Re: [Bier] WGLC: draft-ietf-bier-php
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Hi Nagendra,

Thanks for your comments. Please see zzh> below.



Juniper Business Use Only
From: BIER <bier-bounces@ietf.org> On Behalf Of Nagendra Kumar Nainar (naikumar)
Sent: Tuesday, August 25, 2020 9:22 PM
To: Greg Shepherd <gjshep@gmail.com>; bier@ietf.org
Subject: Re: [Bier] WGLC: draft-ietf-bier-php

[External Email. Be cautious of content]

Hi,

Support.

Few comments below:

==> The below text appears to give an impression that the router is BIER incapable at both control plane and data plane. This either can be clarified or can include a terminology explaining what it is.

"A BIER-incapable router, if acting as a multicast flow overlay
   router, MUST signal its BIER information as specified in [RFC8401] or
   [RFC8444] or [I-D.ietf-bier-idr-extensions]"

Zzh> How about adding the following paragraph after the above paragraph?

   This implies that while the router is not capable of BIER forwarding,
   It is capable of BIER control plane signaling.

==> Section 2.1.1.1 of RFC8296 states that PHP MUST NOT be applied to BIER-MPLS-Label. While the below statement mandates the signaling of Imp-Null (which is to enable PHP). So I think the draft should update RFC8296?.

"With MPLS encapsulation, the BIER-incapable multicast flow overlay
   router MAY omit the BIER MPLS Encapsulation sub-sub-TLV, or MUST set
   the Label field in BIER MPLS Encapsulation sub-sub-TLV to Implicit
   Null Label [RFC3032]."

Zzh> The spirit of that text in 8296 is to say that the BIER label must not be PHP'ed *while keeping the BIER header*. We're talking about PHP the entire BIER header, so it should be ok.
Zzh> Thanks!
Zzh> Jeffrey

Regards,
Nagendra

From: BIER <bier-bounces@ietf.org<mailto:bier-bounces@ietf.org>> on behalf of Greg Shepherd <gjshep@gmail.com<mailto:gjshep@gmail.com>>
Date: Wednesday, August 12, 2020 at 11:31 PM
To: "bier@ietf.org<mailto:bier@ietf.org>" <bier@ietf.org<mailto:bier@ietf.org>>
Subject: [Bier] WGLC: draft-ietf-bier-php


Please read and respond to this thread. We had a WGLC for this draft previously, but had no response. Let's do better.

https://datatracker.ietf.org/doc/draft-ietf-bier-php/<https://urldefense.com/v3/__https:/datatracker.ietf.org/doc/draft-ietf-bier-php/__;!!NEt6yMaO-gk!X57YgScMQ6-UzHN2e-eSA0qNoCKChF6120YQDXdlETmDlz491I0Zs0W8wVo0fv-1$>

Start of short LC timer. Respond by Aug 19..

- Shep
(Chairs)