Re: [Isis-wg] [rbridge] Why is MTU discovery important?
Donald Eastlake <d3e3e3@gmail.com> Tue, 14 April 2009 20:12 UTC
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Date: Tue, 14 Apr 2009 16:13:24 -0400
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From: Donald Eastlake <d3e3e3@gmail.com>
To: Hannes Gredler <hannes@juniper.net>
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Cc: TRILL/RBridge Working Group <rbridge@postel.org>, isis-wg@ietf.org
Subject: Re: [Isis-wg] [rbridge] Why is MTU discovery important?
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See below... On Tue, Apr 14, 2009 at 2:55 PM, Hannes Gredler <hannes@juniper.net> wrote: > Robert Raszuk wrote: >> >> As Dave points out there is "significant amounts of shared code" between >> L3 ISIS & TRILL-ISIS and IMHO it does make sense to keep isis-wg in the >> loop. The Quagga IS-IS implementation supports both. > hehe, i was playing devils advocate here ;-) ... i'll find it worry some > that > the "significant" portion is shrinking for no good reason ... > > i am terribly sorry but i need to bring up an old question again: > > why are there separate PDUs for multicast LSPs and SNPs ? - Answers to that question have been posted several times to the ISIS WG mailing list. I gather the answers do not satisfy you... > most implementation keep all sort of internal databases, > so practically there is a already a separation between unicast > and multi cast - why do we need to change the on-wire representation > of multi-ast data (= new PDU) while the same stuff can be carried in > vanilla LSPs as well. the latest version of the draft does not contain > answers on that matter, although being promised ... Which draft are you talking about? As far as I know, the additional PDUs first showed up in draft-ward-l2isis. Because they were there, I put them in draft-eastlake-trill-rbridge-isis and they are now in draft-ietf-isis-layer2. But I don't think they have ever been mentioned in any TRILL WG draft and I don't off hand recall much discussion of them in the TRILL WG. Thanks, Donald > why do we think that app. 375KB of LSP space to store multicast > information is not enough, and if so why don't we reuse the LSP-ext > draft for adding more space. > > /hannes >>> Robert Raszuk wrote: >>>> >>>> It seems to me just like section 4.2.4.3 Hello Contents of the above >>>> draft says there is sufficiently large number of optional information usable >>>> for TRILL which could be added to today's ISIS header that perhaps it may >>>> make sense to just define it as separate TRILL-Hello msg. >>>> My point was that in the same time the padding issue would be solved yet >>>> a lot of already available code for L3 ISIS could be reused. >>> >>> so we have now separate L2-encaps, separate IIH, separate LSP and >>> separate SNP PDUs >>> - all of that with changed semantics ... >>> >>> sounds to me much more like a new protocol, than something vendors can >>> integrate >>> in their existing IS-IS implementation. >>> >>> if we want to further walk down that road, we should name the beast >>> TRILL-something >>> and drop the isis-wg groups involvement, since this is not IS-IS any >>> more. >>> >>> /hannes -- ============================= Donald E. Eastlake 3rd +1-508-634-2066 (home) 155 Beaver Street Milford, MA 01757 USA d3e3e3@gmail.com
- [Isis-wg] Why is MTU discovery important? Radia Perlman
- Re: [Isis-wg] Why is MTU discovery important? Tony Li
- Re: [Isis-wg] Why is MTU discovery important? Les Ginsberg (ginsberg)
- Re: [Isis-wg] Why is MTU discovery important? mike shand
- Re: [Isis-wg] Why is MTU discovery important? Don Fedyk
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Radia Perlman
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Radia Perlman
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Donald Eastlake
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Les Ginsberg (ginsberg)
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Donald Eastlake
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… David Ward
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Radia Perlman
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… David Ward
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… sgai
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Radia Perlman
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Donald Eastlake
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Don Fedyk
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Tony Li
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Thomas, Matthew R
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… David Ward
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Radia Perlman
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Radia Perlman
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Robert Raszuk
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Donald Eastlake
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Robert Raszuk
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Radia Perlman
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Don Fedyk
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Donald Eastlake
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Radia Perlman
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Thomas, Matthew R
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Don Fedyk
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Dave Katz
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… David Ward
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Don Fedyk
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Radia Perlman
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… mike shand
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Dave Katz
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Hannes Gredler
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Robert Raszuk
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Drake, John E
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Sadler, Jonathan B.
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Hannes Gredler
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Donald Eastlake
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Hannes Gredler
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Dinesh G Dutt
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Sina Mirtorabi (smirtora)
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… sgai
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… sgai
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Dinesh G Dutt
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Suresh Boddapati
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Eric Gray
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Eric Gray
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Sadler, Jonathan B.
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Sadler, Jonathan B.
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Sadler, Jonathan B.
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Les Ginsberg (ginsberg)
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Dave Katz
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Ali Sajassi (sajassi)
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Don Fedyk
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Ali Sajassi (sajassi)
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Ali Sajassi (sajassi)
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Donald Eastlake
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Donald Eastlake
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Don Fedyk
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Ali Sajassi (sajassi)
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Don Fedyk
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Les Ginsberg (ginsberg)
- Re: [Isis-wg] [rbridge] Why is MTU discovery impo… Ali Sajassi (sajassi)