Re: [Anima] ACP -10 [was Re: I-D Action: draft-ietf-anima-autonomic-control-plane-08.txt]
Brian E Carpenter <brian.e.carpenter@gmail.com> Sat, 23 September 2017 20:59 UTC
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To: Michael Richardson <mcr+ietf@sandelman.ca>
Cc: Toerless Eckert <tte@cs.fau.de>, draft-ietf-anima-autonomic-control-plane@ietf.org, anima@ietf.org
References: <150044138257.25233.12391471568614147773@ietfa.amsl.com> <f5e84812-c2fa-cc16-4105-20f7791110f4@gmail.com> <20170918060429.GC31832@faui40p.informatik.uni-erlangen.de> <7e70c270-6cf6-58b9-2ce4-d811f9cd1c87@gmail.com> <13482.1506195787@obiwan.sandelman.ca>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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Date: Sun, 24 Sep 2017 09:58:54 +1300
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Subject: Re: [Anima] ACP -10 [was Re: I-D Action: draft-ietf-anima-autonomic-control-plane-08.txt]
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On 24/09/2017 08:43, Michael Richardson wrote: > > Brian E Carpenter <brian.e.carpenter@gmail.com> wrote: > >> That way, the recipient can compare sender-ttl with the TTL of the received objective > >> and threeby figue out which one is closest. > >> > >> I fine either way. I just tried to go for the most simple, logical option. > > > Right, so the question for the WG (are you all listening?) is whether we > > want to defend the value of the loop count in limiting propagation of multicast > > messages. (Remember that it has another role in negotiation sessions, where > > it really is a loop-prevention counter.) > > > I will note that in testing on looped topologies I have seen looped multicasts > > dropped because of the session ID; theoretically that is sufficient, and the > > loop count is logically redundant. > > So, this lets one > a) notice if the M_FLOOD is forged because the TTL of the underlying > packet does not agree. > b) figure out which M_FLOOD is closer. > > Given: > We have ACP built with P2P tunnels between nodes, and on top of > that we run RPL to form a *unicast* routing topology. > > Should a GRASP deamon send M_FLOODs to all P2P tunnels, regardless of whether > they are active RPL routes? I would tend to say *YES*. In practice, I think GRASP will send to all the ACP interfaces flagged as active in the adjacency table. But that amounts to the same thing. > Given that, one will expect to see the same M_FLOOD from the same sender via > multiple paths. That's fine, and I think it's good. But, comparing them is > kind of meaningless, because once you find out who the sender is, the unicast > routing takes over, and you will take the unicast direction only. > If one hears announcements from multiple senders, then there might be > different directions, but the TTL you see in the M_FLOOD may have NOTHING to > do with what the unicast cost is. True, in a general topology - the LL multicasts combined with GRASP relaying will ammount to a spanning tree rooted at the M_FLOOD sender, but the unicast paths will be set by RPL. There's no reason they will be congruent. They might be. This is a good point! Brian
- Re: [Anima] Some questions to the WG: [I-D Action… Michael Richardson
- [Anima] Some questions to the WG: [I-D Action: dr… Brian E Carpenter
- [Anima] I-D Action: draft-ietf-anima-autonomic-co… internet-drafts
- Re: [Anima] I-D Action: draft-ietf-anima-autonomi… Brian E Carpenter
- [Anima] ANIMA ACP -08 -- estimating depth of DODA… Michael Richardson
- [Anima] VLANs and draft-ietf-anima-autonomic-cont… Michael Richardson
- Re: [Anima] VLANs and draft-ietf-anima-autonomic-… Michael Richardson
- Re: [Anima] I-D Action: draft-ietf-anima-autonomi… Toerless Eckert
- [Anima] ACP -10 [was Re: I-D Action: draft-ietf-a… Brian E Carpenter
- Re: [Anima] ACP -10 [was Re: I-D Action: draft-ie… Toerless Eckert
- Re: [Anima] ACP -10 [was Re: I-D Action: draft-ie… Brian E Carpenter
- Re: [Anima] ACP -10 [was Re: I-D Action: draft-ie… Brian E Carpenter
- [Anima] GRASP objective details for registrar (wa… Toerless Eckert
- Re: [Anima] GRASP objective details for registrar Brian E Carpenter
- Re: [Anima] GRASP objective details for registrar Toerless Eckert
- Re: [Anima] I-D Action: draft-ietf-anima-autonomi… Michael Richardson
- Re: [Anima] ACP -10 [was Re: I-D Action: draft-ie… Michael Richardson
- Re: [Anima] GRASP objective details for registrar Brian E Carpenter
- Re: [Anima] I-D Action: draft-ietf-anima-autonomi… Brian E Carpenter
- Re: [Anima] ACP -10 [was Re: I-D Action: draft-ie… Brian E Carpenter
- Re: [Anima] I-D Action: draft-ietf-anima-autonomi… Michael Richardson
- Re: [Anima] ACP -10 [was Re: I-D Action: draft-ie… Michael Richardson
- Re: [Anima] GRASP objective details for registrar… Michael Richardson
- Re: [Anima] GRASP objective details for registrar Toerless Eckert
- [Anima] GRASP objectives used in multiple documen… Brian E Carpenter
- Re: [Anima] I-D Action: draft-ietf-anima-autonomi… Toerless Eckert
- Re: [Anima] GRASP objective details for registrar Brian E Carpenter
- Re: [Anima] I-D Action: draft-ietf-anima-autonomi… Michael Richardson
- Re: [Anima] GRASP objectives used in multiple doc… Michael Richardson
- Re: [Anima] GRASP objectives used in multiple doc… Brian E Carpenter