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

Dhruv Dhody <dhruv.ietf@gmail.com> Wed, 19 August 2020 14:24 UTC

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From: Dhruv Dhody <dhruv.ietf@gmail.com>
Date: Wed, 19 Aug 2020 19:53:31 +0530
Message-ID: <CAB75xn6vKUW8J18f2tj2L0TYhaYuR3v023-9CY6DQWAAUZ-rWg@mail.gmail.com>
To: Loa Andersson <loa@pi.nu>
Cc: "Gengxuesong (Geng Xuesong)" <gengxuesong@huawei.com>, Greg Shepherd <gjshep@gmail.com>, "bier@ietf.org" <bier@ietf.org>
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Subject: Re: [Bier] WGLC: draft-ietf-bier-php
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Hi Loa,

On Wed, Aug 19, 2020 at 5:07 PM Loa Andersson <loa@pi.nu> wrote:
>
> All,
>
> yes, support.
>
> I have one thought that possibly don't need to have an impact on
> progressing this draft.
>
> If you think of the p2mp forwarding tree in bier as a p2mp LSP,
> it seems to me that the LSP setup by this draft ends on penultimate
> node (which is kind of an oxymoron). The ultimate node is also the
> node th do the PHP, which would make it UHP. If the LSP ends on a node
> that is the ultimate node.
>
> For example in MPLS the LSP ends on the ultimate node, while the
> pen-ultimate node does the PHP.
>
> It would also be interesting to know how PCE does this. Dhruv?
>

In my understanding, from the control plane point of view, the LSP
does not end on the penultimate node, the destination is the ultimate
node. While in the forwarding the bier header could be popped on the
penultimate node and packet sent to the ultimate node, but the LSP's
destination still is the ultimate node.

BTW in PCE P2MP documents, you would not find any reference to PHP.
>From the P2MP tree path computation point of view, the computation is
done till the ultimate node and it is up to the signaling to handle
PHP.

Thanks!
Dhruv

> As I said, don't let thgis stop progressing this draft, but we
> maybe should sit down and and come with a unified way of using
> the concepts.
>
> On 19/08/2020 09:40, Gengxuesong (Geng Xuesong) wrote:
> > Yes, support !
> >
> > Best Regards
> >
> > Xuesong
> >
> > *From:*BIER [mailto:bier-bounces@ietf.org] *On Behalf Of *Greg Shepherd
> > *Sent:* Thursday, August 13, 2020 11:31 AM
> > *To:* 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/
> >
> > Start of short LC timer. Respond by Aug 19..
> >
> > - Shep
> >
> > (Chairs)
> >
> >
> > _______________________________________________
> > BIER mailing list
> > BIER@ietf.org
> > https://www.ietf.org/mailman/listinfo/bier
> >
>
> --
>
> Loa Andersson                        email: loa@pi.nu
> Senior MPLS Expert                          loa.pi.nu@gmail.com
> Bronze Dragon Consulting             phone: +46 739 81 21 64

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