Re: [rbridge] [Isis-wg] draft-ietf-trill-clear-correct-00
Donald Eastlake <d3e3e3@gmail.com> Tue, 06 March 2012 19:10 UTC
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From: Donald Eastlake <d3e3e3@gmail.com>
Date: Tue, 06 Mar 2012 13:44:16 -0500
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To: Mike Shand <imc.shand@googlemail.com>
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Cc: rbridge@postel.org, isis-wg@ietf.org
Subject: Re: [rbridge] [Isis-wg] draft-ietf-trill-clear-correct-00
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Hi Mike, Thanks for the review and comments. See below. On Tue, Mar 6, 2012 at 6:11 AM, Mike Shand <imc.shand@googlemail.com> wrote: > Hi Donald, > > I had a quick skim through this and noticed the following, which you may > wish to address. > > 2. Overloaded and/or Unreachable RBridges para 3 > > TYPO "They can do reasonable well" -> reasonably OK. > 2.1 Reachability para 3 > > "which could be tens of seconds or longer." > > The default value for MaxAge in ISO/IEC 10589 is 20 minutes (1200 seconds), > so "tens of seconds" is something of an underestimate, unless TRILL is > proposing running with a MUCH smaller value of MaxAge (and hence > maximumLSPGenerationInterval). I'll change seconds to minutes. I think the existing text was written erroneously thinking about 30 or 40 second holding times. > It is confusing to have the statement that "As a result, RB1 will be aware > of the partition." after the statement that the stale LSPs will hang around > for a long time, since it sounds as if this very delay is the cause of the > knowledge of the partition. I THINK what you are trying to say is that it > doesn't matter that you don't receive the new LSPs from the far side of the > partition, since you WILL receive the updated LSPs from the nodes adjacent > to the failure(s) on the near side of the partition, and this is sufficient > to determine the lack of connectivity. Right. > This may be clearer if you put the "As a result..." sentence before the > "However, LSPs held..." sentence. Yes, it reads much better that way. > Or perhaps I am completely misunderstanding the point you are making. Nope, you have it right. > 2.4.2.1 An Example Network para 2 > > TYPO "has such a neighbor that signal it is willing" -> signals (or has > signalled) OK. > 5.2 Ethernet MTU Values para 1 > > "originatingL1LSPBufferSize is the maximum permitted size of LSPs after the > eight byte fixed IS-IS PDU header." > > I don't know where this idea came from but it is not correct. > originatingL1LSPBufferSize refers to the size of the entire LSP starting > with the protocol discriminator. > > I suspect this may be an erroneous deduction from the fortuitous fact that > adding 8 to 1492 gives 1500. Precisely. > In fact the 1492 is a relic of the origins of ISO/IEC 10589 in DECnet Phase > V, where before its adoption as a standard, > the frames were encoded using the SNAP SAP, which necessarily limited the > maximum available payload to 1492. > This length was never changed when the encoding was changed, although it > could have been made 1497. OK. I'll correct the definition and adjust the numbers appropriately. Thanks again, Donald ============================= Donald E. Eastlake 3rd +1-508-333-2270 (cell) 155 Beaver Street, Milford, MA 01757 USA d3e3e3@gmail.com > Mike > > > > > > > On 06/03/2012 04:25, Donald Eastlake wrote: >> >> Participant in the ISIS WG my want to look at this draft, which is >> currently in WGLC in the TRILL WG as it has some IS-IS aspects: >> https://datatracker.ietf.org/doc/draft-ietf-trill-clear-correct/ >> >> Thanks, >> Donald >> ============================= >> Donald E. Eastlake 3rd +1-508-333-2270 (cell) >> 155 Beaver Street, Milford, MA 01757 USA >> d3e3e3@gmail.com >> _______________________________________________ >> Isis-wg mailing list >> Isis-wg@ietf.org >> https://www.ietf.org/mailman/listinfo/isis-wg > > _______________________________________________ rbridge mailing list rbridge@postel.org http://mailman.postel.org/mailman/listinfo/rbridge
- Re: [rbridge] [Isis-wg] draft-ietf-trill-clear-co… Donald Eastlake