> Lately I find myself wondering if there's not room for a uniform layer 2.5
> interface that is designed to work over a set of bridged 802-style layer 2 
> networks, but presents a slightly different interface to the host. [...]

> (has this already been worked on and I just don't know about it?)

There is a recent proposal in
draft-perlman-zerouter-rbridge-00.txt

which doesn't have authentication and tries to make the network
more scalable by doing better than a spanning tree.

Whether or where this fits in the IETF is an open issue.

  Erik

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