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[Anima] ACP [was I-D Action: draft-ietf-anima-grasp-13.txt - SONN]

Brian E Carpenter <brian.e.carpenter@gmail.com> Fri, 09 June 2017 20:43 UTC

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To: Michael Richardson <mcr+ietf@sandelman.ca>
Cc: Anima WG <anima@ietf.org>
References: <149669625424.3230.10151704455578829166@ietfa.amsl.com> <f829bda3-d4f5-014d-8ffd-e63537171ba6@gmail.com> <20170606232417.GJ12427@faui40p.informatik.uni-erlangen.de> <41e0a6fc-9410-4d84-cae6-74dbd3fdfa74@gmail.com> <20170607205533.GD20021@faui40p.informatik.uni-erlangen.de> <7dd77b25-2319-3999-bf4a-2274eb0728a1@gmail.com> <3434.1496937571@obiwan.sandelman.ca> <cb901c29-cdf9-fdff-8e9b-1e2cc5079359@gmail.com> <21716.1497019696@obiwan.sandelman.ca>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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Date: Sat, 10 Jun 2017 08:43:09 +1200
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Subject: [Anima] ACP [was I-D Action: draft-ietf-anima-grasp-13.txt - SONN]
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On 10/06/2017 02:48, Michael Richardson wrote:
> 
> Brian E Carpenter <brian.e.carpenter@gmail.com> wrote:
>     > So this is why I've been asking the ACP authors to be precise about the
>     > service they will offer to GRASP, over many months. They tell me it
>     > will be a VRF instance providing a reasonably small number of (virtual)
>     > interfaces to GRASP. GRASP will send LL multicasts to each of those
>     > interfaces, and the VRF instance has to do the right thing, i.e. replicate
>     > those multicasts as needed. But that's layer 3, it just has LL scope.
> 
>     > Nothing new here that I can see.
> 
> Since all the links will be PPP links, there will be no "replication".

I think that's our choice to make. Please see:

https://mailarchive.ietf.org/arch/msg/anima/-vOvFVQr6zcognXJxwKKB9_t5-Q

GRASP discovery and flood, by their nature, must be received by all
GRASP neighbours. How it happens isn't actually very important - if
there was such a thing as secure link-local multicast, we'd use it.
But if not, *somebody* is going to replicate the packets. If the VRF
doesn't do it, GRASP itself will have to do it. That doesn't seem optimal
to me.

I would like the ACP VRF to emulate link-local multicast to all nodes
listed in the adjacency table as neighbours on the same physical interface.
If it doesn't, then GRASP will.

IMHO we need a precise statement of the service the ACP will provide
at the API it presents to GRASP. That can't be left as an implementation
detail.

    Brian

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