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Re: [Bier] Call for adoption: draft-hj-bier-ldp-signaling

"Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net> Fri, 25 January 2019 19:19 UTC

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From: "Jeffrey (Zhaohui) Zhang" <zzhang@juniper.net>
To: "gjshep@gmail.com" <gjshep@gmail.com>, BIER WG <bier@ietf.org>
Thread-Topic: [Bier] Call for adoption: draft-hj-bier-ldp-signaling
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Date: Fri, 25 Jan 2019 19:19:46 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bier/VWsGi_yxF01A6bVlQ9tQ77r4004>
Subject: Re: [Bier] Call for adoption: draft-hj-bier-ldp-signaling
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There were quite some offline discussions on this, and I don’t think we’re ready to adopt this draft yet.

There are basically three options to signal mLDP over a BIER core:


  1.  RFC7060 mLDP over Targeted sessions
  2.  BGP-MVPN/GTM with mLDP as the PE-CE protocol
  3.  This draft-hj

#1 is already a RFC and can be easily applied to a BIER core.
For #2, RFC6514 already covers mLDP as PE-CE protocol. Now with a BIER core, the only difference is that the provider tunnel is BIER. Although draft-ietf-bier-mvpn talks about (C-S/*,C-G), other than that all the procedures apply to mLDP as PE-CE protocol. All we need to do is to extend GTM RFC7716 (global table multicast with BGP-MVPN) to cover mLDP as the access protocol.

#3 converts hard state LDP label mapping/withdraw into soft state messages carried in BIER. To me that just does not make sense.
One reason given for doing #3 is that operators would not want to run LDP session over the core. I am not yet convinced on that – on the border routers you need to run LDP on the access interfaces anyway, I really don’t see the concern with running targeted session over the core.

Thanks.
Jeffrey

From: BIER [mailto:bier-bounces@ietf.org] On Behalf Of Greg Shepherd
Sent: Friday, January 25, 2019 1:15 PM
To: BIER WG <bier@ietf.org>
Subject: [Bier] Call for adoption: draft-hj-bier-ldp-signaling

Please read and reply to this thread with your vote for/against adoption of:

https://datatracker.ietf.org/doc/draft-hj-bier-mldp-signaling/<https://urldefense.proofpoint.com/v2/url?u=https-3A__datatracker.ietf.org_doc_draft-2Dhj-2Dbier-2Dmldp-2Dsignaling_&d=DwMFaQ&c=HAkYuh63rsuhr6Scbfh0UjBXeMK-ndb3voDTXcWzoCI&r=f7wsLGcfzAWDNS6XNTBZwj_OLAOsZZqdrR2IDAzeZqE&m=qCjzMO_5mJ31uNeQWAfFAtYuXU-SxLW6FZ3F9w1X7HM&s=BQN8YR0amWZvFTVJOYknPuhZFw-UKsOBzXeUYrznkZE&e=>

..as a BIER WG document.

This starts a two week counter.

Thanks,
Chairs
(Shep)

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