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> Thu, 21 September 2017 23:25 UTC
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To: Toerless Eckert <tte@cs.fau.de>
Cc: 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> <20170920170726.GA18746@faui40p.informatik.uni-erlangen.de> <b392cf90-ffcf-d053-0a01-31b510277077@gmail.com>
From: Brian E Carpenter <brian.e.carpenter@gmail.com>
Organization: University of Auckland
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Date: Fri, 22 Sep 2017 11:25:12 +1200
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Archived-At: <https://mailarchive.ietf.org/arch/msg/anima/ZK0jhnHAbbeE_uwVH7pjxWOFlo4>
Subject: Re: [Anima] ACP -10 [was Re: I-D Action: draft-ietf-anima-autonomic-control-plane-08.txt]
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By the way, I just realised the obvious: we could write much more succinct CDDL definitions of objective-values if we wanted to. For my suggestion below, this means exactly the same: objective-value = [ 0..255, [ +("BRSKI-TLS" / "EST-TLS") ], *[ any ] ] Regards Brian On 21/09/2017 14:51, Brian E Carpenter wrote: > On 21/09/2017 05:07, Toerless Eckert wrote: >> Thanks, Brian >> >> a) i will fix the ABNF with next update (for Shengs review). > > Great. > >> b) Given the order of likely last calls, i will suggest in the bootstrap meeting that we >> define the AN_Registrar objective authoritatively in ACP and BRSKI adds to it the >> "BRSKI" method. BRSKI already should have no issue having ACP as normative reference. >> Lets see how that discussion goes. > > Works for me. Just decide whether you want AN_registrar or AN_join_registrar. > >> c) Given my ABNF/CDDL dyslexia, would you mind to propose a correct CDDL for the >> objective-value structure to include the TTL and method, eg: fixup the following: >> >>>> objective-value = [ sender-ttl, method-list [, future-extensions]* ] >>>> method-list = [ method ]*1 >>>> methd = BRSKI-TLS | EST-TLS | ... >>>> sender-ttl = NUM > > I would go for this: > > objective-value = [ sender-ttl, method-list, *[ future-extensions ] ] > method-list = [ +method ] > method = "BRSKI-TLS" / "EST-TLS" > sender-ttl = 0..255 > future-extensions = any > > The "+" prefix means 1 or more in CDDL and "*" means zero or more. > The commas in lists like [+method] are implied. (I checked > this fragment with the CDDL tool.) > > I used strings for the method for simplicity; if you want to save a few > bytes you could use symbols but then they have to be assigned values like > BRSKI-TLS = 0 > EST-TLS = 1 > and you end up with another IANA registry in your life. > > Regards > Brian > >> If we do not get further feedback from the WG supporting my simple TTL=255 approach, >> i would rather go with this structure approach, so that we can let the TTL disussion >> take its natural course (figure out it should be 255 over 10 years ;-P). Primarily, >> because i like the idea to show off a bit the flexiblity of GRASP for the objective >> value being a structure. ANd because it would be a good reference for further objectives >> where we want to discover/select closest instance (and we didn't include this into the >> GRASP document proper). >> >> Cheers >> Toerless >> >>>> (pretty sure i didn't get the CBOR template not right, but i am sure you get the idea) >>> >>> Not only do I get the idea, I tested it out many months ago; actually after the >>> discussions in Berlin, I think. In my Pythonic world it was very easy, but it is >>> indeed a bit more complicated than the 255-N method. >>> >>>> >>>> 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. >>> >>> Otherwise, me happy. >>> >>> Thanks again for all the work, >>> >>> 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