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[Bier] Comment on draft-hj-bier-mldp-signaling-00

Eric C Rosen <erosen@juniper.net> Tue, 10 July 2018 21:12 UTC

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From: Eric C Rosen <erosen@juniper.net>
To: BIER WG <bier@ietf.org>
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Archived-At: <https://mailarchive.ietf.org/arch/msg/bier/jr9rQvcrifMZIvio2yRZUH421uw>
Subject: [Bier] Comment on draft-hj-bier-mldp-signaling-00
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I note that the problem described in draft-hj-bier-mldp-signaling is 
essentially the same problem that is solved by RFC 7060 ("Using mLDP on 
Targeted LDP Sessions").  Section 6 of that RFC discusses the use of  
multicast tunneling to transport packets from an ingress LDP edge node 
to a set of egress LDP edge nodes, and applying it to BIER is 
straightforward.

RFC 7060 does require targeted LDP sessions between edge nodes. 
Draft-hj-bier-mldp-signaling proposes to replace those LDP sessions 
either by using an SDN controller, or by encapsulating an mLDP packet in 
a BIER packet (analogous to what is done with PIM in 
draft-ietf-bier-pim-signaling).  There are a couple of issues with the 
"encapsulate mLDP packets in BIER" option:

- There is no such thing as an "mLDP packet".  You'd need to extract 
mLDP messages from the TCP stream, and you need to say exactly which 
messages need to be forwarded and which don't.

- If you are trying to connect two LDP sessions by sending mLDP messages 
in datagrams, you will have a big problem if one of those datagrams gets 
lost.  Or if one of the edge nodes reboots.

Eliminating the TCP-based LDP signaling protocol by inventing a new 
datagram-based LDP signaling protocol is probably not a simplification.

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