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Re: [Anima] Multicast in the ACP?

Toerless Eckert <eckert@cisco.com> Thu, 23 April 2015 17:40 UTC

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Date: Thu, 23 Apr 2015 10:39:20 -0700
From: Toerless Eckert <eckert@cisco.com>
To: Michael Richardson <mcr+ietf@sandelman.ca>
Message-ID: <20150423173920.GC11499@cisco.com>
References: <5536EE40.30705@gmail.com> <3AA7118E69D7CD4BA3ECD5716BAF28DF22F5FE63@xmb-rcd-x14.cisco.com> <5537FFEF.9020308@gmail.com> <10795.1429737994@sandelman.ca>
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Cc: Anima WG <anima@ietf.org>
Subject: Re: [Anima] Multicast in the ACP?
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[individual]

On Wed, Apr 22, 2015 at 05:26:34PM -0400, Michael Richardson wrote:
> http://datatracker.ietf.org/doc/draft-ietf-roll-trickle-mcast/
> describes a way to do multicast across that collection of links... that is if
> we can ever get it through the IESG.

MPL is flooding with sequence numbers for loop/duplicate avoidance.
It then uses Trickle for link transmission which also doing
link-level duplicate avoidance by sequence number (observing what
others have sent, do not send yourself again). Kinda like CSMA/SA
(Send Avoidance ;-)

If we have p2p secure associations between neighbors, there will
likely not be a lot of benefit for the Trickle part though, so
might end up having some amount of overdesign for what we need.

I also would prefer the idea of hop-by-hop reliable forwarding.
All this datagram multicasting across slow/unreliable networks
is IMHO a mistake. MPL could introduce that hop-by-hop reliability
i think it doesn't do it so far, and its reinventing reliability.

Toerless

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