A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : Flexible Multilevel TRILL (Transparent Interconnection of Lots of Links)
Author(s) : Radia Perlman
Donald Eastlake
Anoop Ghanwani
Hongjun Zhai
Filename : draft-perlman-trill-rbridge-multilevel-06.txt
Pages : 27
Date : 2013-07-04
Abstract:
Extending TRILL to multiple levels has one challenge that is not
addressed by the already-existing capability of IS-IS to have
multiple levels. The issue is with RBridge nicknames. There have been
two proposed approaches. One approach, which we refer to as the
"unique nickname" approach, gives unique nicknames to all the
RBridges in the multilevel campus, either by having the
level-1/level-2 border RBridges advertise which nicknames are not
available for assignment in the area, or by partitioning the 16-bit
nickname into an "area" field and a "nickname inside the area" field.
The other approach, which we refer to as the "aggregated nickname"
approach, involves assigning nicknames to the areas, and allowing
nicknames to be reused in different areas, by having the border
RBridges rewrite the nickname fields when entering or leaving an
area. Each of those approaches has advantages and disadvantages. The
design in this document allows a choice of approach in each area,
allowing the simplicity of the unique nickname approach in
installations in which there is no danger of running out of
nicknames, and allowing nickname rewriting to be phased into larger
installations on a per-area basis.
The IETF datatracker status page for this draft is:
https://datatracker.ietf.org/doc/draft-perlman-trill-rbridge-multilevel
There's also a htmlized version available at:
http://tools.ietf.org/html/draft-perlman-trill-rbridge-multilevel-06
A diff from the previous version is available at:
http://www.ietf.org/rfcdiff?url2=draft-perlman-trill-rbridge-multilevel-06
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
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