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[Bier] Comments on about PCEP and BIER

"Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net> Thu, 11 November 2021 16:55 UTC

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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: "bier@ietf.org" <bier@ietf.org>, "lihn6@foxmail.com" <lihn6@foxmail.com>, "wangaj3@chinatelecom.cn" <wangaj3@chinatelecom.cn>
Thread-Topic: Comments on about PCEP and BIER
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Date: Thu, 11 Nov 2021 16:54:58 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bier/qq3tBjoJU9gCPvmmBkGiPe3hkDQ>
Subject: [Bier] Comments on about PCEP and BIER
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Hi,

These are follow up comments about draft-li-pce-based-bier presented in today's BIER session.

Tony mentioned it's better to rename it to something like "bier-pcep-overlay-ip-mcast". There was also a question whether there should be one PCEP document for other multicast trees.

I think there should be one PCEP document (or a set of PCEP documents with *similar* signaling/procedures) that covers all the following:

- Set up multicast trees in default/master routing instance or VRFs, whether it is IP multicast or SR-P2MP tunnel or even mLDP tunnel
- The replication can be BIER or BIER-TE or native IP forwarding (just like in PIM case) or MPLS/SRv6 based

In fact, there is one similar document for BGP signaling already - draft-ietf-bess-bgp-multicast-controller - that does all the above using BGP (see https://mailarchive.ietf.org/arch/msg/idr/V_GLdnLnIA87wsd3fbcUKchNnTs/ about how BIER-TE can be used for replication on a multicast tree node). I am not saying that PCEP is not needed - I am just saying that similar specification can be done for PCEP.

If we take that approach, the document would be homed in PCEP, and BIER/BIER-TE relevant part is just how to specify the bitstring that a BFIR would use (i.e., 7.3.  Forwarding Indication Object) - assuming that "7.1.2.  BIER Information TLV" would be done via BGP-LS.

Thanks.

Jeffrey



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