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RE: Unnumbered support with ISIS - using exiting TLV
-> To support unnumbered links the current GMPLS ISIS routing spec
-> defines new TLV, Link Identifier, to be carried in ISIS Hellos. It
-> was pointed out that ISIS already has an existing mechanism to
-> exchange link identifiers - see draft-ietf-isis-3way-05.txt. So,
-> unless there are specific technical objections, I would suggest we
-> replace Link Identifier TLV with the mechanism described in
AFAIK, ISIS 3-Way handshake is optional and It is fully
interoperable with systems that do not support the extension.
I think we are making a dependency here - ISIS Unnumbered extensions
(for (G)MPLS-TE purpose and not for normal hop-by-hop routing)
will be supported only with 3-way handshake extensions. If that
is not a big problem, I completely agree with your proposal.