Switching technologies requiring bidirectional asymmetric LSPs?

[Lou Berger <lberger@labn.net>]

All,

So a few of us have been having been discussing the asymmetric work 
presented in Prague and it seems to me we have an open question on 
requirements.

It's clear that at least one switching technology (i.e., 
ethernet/PBB-TE) requires support for bidirectional asymmetric 
LSPs.  The question is:

Is the *requirement* for bidirectional asymmetric LSPs:
(a) a technology specific requirement, or
(b) one that is common (this is CCAMP after all!) to multiple 
switching technologies?

Please keep in mind that service requirements are not the same thing 
as switching technology requirements.  For example, we have long 
built bidirectional asymmetric services on unidirectional MPLS LSPs.

The answer to this question will help determine if we should have a 
technology specific solution or a generic CCAMP solution (as well as 
the complexity of the solution.)

Much thanks,
Lou