A New Internet-Draft is available from the on-line Internet-Drafts directories.
Title : RBridges: Transparent Routing
Author(s) : R. Perlman, et al.
Filename : draft-perlman-rbridge-00.txt
Pages : 0
Date : 2004-5-3
This design provides the ability to have an entire campus, with
multiple physical links, look to IP like a single subnet. This allows
zero configuration of the switches within the campus, and allows
nodes to move around within the campus without changing IP addresses.
This capability is often provided today with bridges. Bridges do
accomplish this goal. However, bridges have disadvantages: routing
is confined to a spanning tree (precluding pair-wise shortest paths),
the header on which the spanning tree forwards has no hop count,
spanning tree forwarding in the presence of temporary loops spawns
exponential copies of packets, nodes can have only a single point of
attachment, and the spanning tree, in order to avoid temporary loops,
is slow to start forwarding on new ports. The design in this paper
avoids these disadvantages of bridges while maintaining the
advantages. This design works for both IPv4 and IPv6.
This document is a work in progress; we invite you to participate on
the rbridge mailing list at http://www.postel.org/rbridge
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