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Re: [Idr] draft-hb-idr-sr-p2mp-policy (3/10 to 3/24/2022) - Adoption call

"Stone, Andrew (Nokia - CA/Ottawa)" <andrew.stone@nokia.com> Mon, 14 March 2022 15:16 UTC

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From: "Stone, Andrew (Nokia - CA/Ottawa)" <andrew.stone@nokia.com>
To: Susan Hares <shares@ndzh.com>, "idr@ietf.org" <idr@ietf.org>
Thread-Topic: [Idr] draft-hb-idr-sr-p2mp-policy (3/10 to 3/24/2022) - Adoption call
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Date: Mon, 14 Mar 2022 15:15:51 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/idr/8rU_RgeTv7pyx1OYCZyN6NPmIaI>
Subject: Re: [Idr] draft-hb-idr-sr-p2mp-policy (3/10 to 3/24/2022) - Adoption call
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Hi IDR,

As co-author, support adoption.

(1) yes. The solution builds on the existing patterns laid out by unicast SR Policy, adding support for multiple egress SID lists to establish the mulicast tree in a straight forward manner to achieve draft-ietf-pim-sr-p2mp-policy. Considerations of protection and optimization are embedded in the document.

(2) yes. The NLRI definition has been simplified to contain only minimum fields as required. The separation of policy vs replication segment vs outgoing segments simplifies the understanding and troubleshooting routes for headend vs root/transit/leaf, as well as the BGP message exchange overhead needed to perform simple path updates. The TEA for replication segment route is following the unicast model but tweaked slightly to carry protection info.

(3) In general, yes. More text and/or examples for section 4.3 global optimization is likely required, which could be added as the document becomes more refined.

(4) yes. As mentioned, the building blocks taken from unicast, combined with the route decoupling solves the sr-p2mp/replication segment architecture in BGP in a consistent manner.

(5) I think the capability to advertise in BGP should exist. While an alternative mechanism is certainly PCEP, which is also progressing in PCE WG, but as experienced with unicast there are different preferences and operational considerations with using BGP vs PCEP to inject tunnel state into the network. This draft permits those who wish to use BGP, likely already coming from unicast, to follow the same paradigm but with multicast.

Thanks
Andrew

From: Idr <idr-bounces@ietf.org> on behalf of Susan Hares <shares@ndzh.com>
Date: Thursday, March 10, 2022 at 10:29 AM
To: "idr@ietf.org" <idr@ietf.org>
Subject: Re: [Idr] draft-hb-idr-sr-p2mp-policy (3/10 to 3/24/2022) - Adoption call

IDR WG:

If you just wish to respond to the IDR list,
you may respond to this email on the adoption call.

Cheers, Sue

From: Idr [mailto:idr-bounces@ietf.org] On Behalf Of Susan Hares
Sent: Thursday, March 10, 2022 9:55 AM
To: idr@ietf.org; pim@ietf.org; bess@ietf.org
Subject: [Idr] draft-hb-idr-sr-p2mp-policy (3/10 to 3/24/2022)

This begins a 2 week WG adoption call for:
draft-hb-idr-sr-p2mp-policy from (3/10 to 3/24/2022)

You can obtain the draft at:
https://datatracker.ietf.org/doc/draft-hb-idr-sr-p2mp-policy/

In your comments for this call please consider:

1)  Does this technology support the SR P2MP features
that distributes candidate paths which connect
a multicast distribution tree (tree to leaves).

2) Is the technology correctly specified for the
NLRI (AFI/SAFI) and the tunnel encapsulation attribute
additions (sections 2 and 3)?

3) Does the P2MP policy operation (section 4)
provide enough information for those implementing this
technology and those deploying the technology?

4) Do you think this multicast technology is a good
Place to start for P2MP policy advertisement via BGP?

5) Do you think this SR P2MP policies should not be advertised
via BGP?

Cheers, Susan Hares

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