[rbridge] L3 vs. L2 encapsulation

[Alper Yegin]

One of the issues listed in draft-perlman-rbridge-03.txt is the choice
of encapsulation. See Section 5.5 for a detailed discussion. 

Can we close that issue agreeing to a L3 encapsulation? 

This does not prevent anyone designing a L2 encapsulated version by
reusing the base spec(s) as much as possible. That should be outside the
scope of the WG though.

Comments welcome.

Alper