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[Anima-signaling] draft-ietf-anima-grasp-04A

Brian E Carpenter <brian.e.carpenter@gmail.com> Mon, 07 March 2016 22:51 UTC

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To: Anima signaling DT <anima-signaling@ietf.org>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
Message-ID: <56DE05D2.1070802@gmail.com>
Date: Tue, 8 Mar 2016 11:50:58 +1300
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Cc: "Joel M. Halpern" <jmh@joelhalpern.com>
Subject: [Anima-signaling] draft-ietf-anima-grasp-04A
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Hi Design Team, Joel,

Attached is proposed update to GRASP that hopefully fixes a serious
looping issue that Joel noticed in the -03 draft.

The issue was that in a physical topology with 3 or more LANs
connected in a loop by 3 or more routers, GRASP multicasts
(Discovery and Flood Synch messages) would have looped until
the loop count reached zero.

The fix was to revert to the 'initiator' field previously
included in the -02 draft, but with the logic properly worked
out this time ;-).

I've both observed the problem in the -03 version of the
prototype code, and shown that the fix works in a new -04
version of the code. (I didn't need to build a router loop;
when the code is set to listen to its own multicasts, it
simulates an infinite router loop.)

Co-authors: any comments or objections? I'd like to post
this draft during this week, as I will be on vacation next
week.

Txt file and diffs attached. I will post the XML to GitHub.

Regards
   Brian

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