Re: [rbridge] two minor issues with the isis-02 draft
James Carlson <james.d.carlson@sun.com> Wed, 25 February 2009 17:07 UTC
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Date: Wed, 25 Feb 2009 11:16:00 -0500
From: James Carlson <james.d.carlson@sun.com>
To: Donald Eastlake <d3e3e3@gmail.com>
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Cc: TRILL/RBridge Working Group <rbridge@postel.org>
Subject: Re: [rbridge] two minor issues with the isis-02 draft
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Donald Eastlake writes: > > (I was unable to find anything in protocol-11 that supported the need > > for this particular restriction, though it's possible I missed > > something.) > > I don't think the Extended IS Reachability TLV is particularly > wasteful. In the common case, both the TLV #2 and #22 data for an > adjacency is 11 bytes long so 23 will fit into a TLV for either. OK; maybe "wasteful" is too strong. "Needless" is better. > I think the primary motivation for the 24 bit metric per adjacency in > the Extended IS Reachability TLV is that you have only 6 bits of > default metric per adjacency in the original IS Reachability TLV (it's > an octet but one bit is used up to indicate internal/external and one > bit is now the up/down bit [RFC 2966]). A 6 bit integer metric (1 to > 63) is very coarse and is insufficient to express the relative costs > of a 10 megabit versus a 1 gigabit link, let alone the existing 10 > gigabit links and the 40 and 100 gigabit links under development. [RFC > 3784] Given this problem, mandating the Extended IS Reachability TLV > seems reasonable to me do you can have a globally consistent link > speed derived metric. That's a great argument for why one *should* use the newer metric scheme. What's the argument for an effective "must"? > > The protocol draft doesn't seem to indicate how large this counter > > needs to be (is 8 bits enough or would more be better?), but I think > > this should be added into the existing "2.d VLANs and Bridge Roots" > > sub-TLV. > > Yes, draft-eastlake-trill-rbridge-isis is no longer being updated. The > plan is for all the TRILL IS-IS TLV and sub-TLVs to be added to the > draft-ward-l2isis draft. I'll check that this is being included in > that transfer. OK; thanks. That sounds good. -- James Carlson, Solaris Networking <james.d.carlson@sun.com> Sun Microsystems / 35 Network Drive 71.232W Vox +1 781 442 2084 MS UBUR02-212 / Burlington MA 01803-2757 42.496N Fax +1 781 442 1677 _______________________________________________ rbridge mailing list rbridge@postel.org http://mailman.postel.org/mailman/listinfo/rbridge
- [rbridge] two minor issues with the isis-02 draft James Carlson
- Re: [rbridge] two minor issues with the isis-02 d… Donald Eastlake
- Re: [rbridge] two minor issues with the isis-02 d… Donald Eastlake
- Re: [rbridge] two minor issues with the isis-02 d… James Carlson
- Re: [rbridge] two minor issues with the isis-02 d… mike shand
- Re: [rbridge] two minor issues with the isis-02 d… James Carlson
- Re: [rbridge] two minor issues with the isis-02 d… Radia Perlman
- Re: [rbridge] two minor issues with the isis-02 d… James Carlson
- Re: [rbridge] two minor issues with the isis-02 d… Donald Eastlake
- Re: [rbridge] two minor issues with the isis-02 d… James Carlson