Subject: [mpls-tp] A question regarding draft-ietf-mpls-tp-fault-02.

From: Alexander Vainshtein <[email-masked]>
Date: Sun, 11 Jul 2010 16:51:09 +0300

George, Matthew and all,
I have a possibly naïve question regarding LDI generation as defined in the above-mentioned draft.
My reading of the draft is that, upon a failure of a certain link, the node that that terminates this link and observes the failure starts generating downstream AIS/LDI messages on all the LSPs that are affected (fatally?) by this link failure.

This behavior requires ability to associate a link with a set of LSPs that use it as the ingress link.

Such association is trivial if per-interface label space is used for all LSPs associated with the link. But what happens if per-platform label space is used? Strictly speaking, in this case there is  no inherent linkage between received labels and ingress interfaces.

Does the draft imply that that AIS/LDI is implicitly restricted to LSPs using per-interface label space?

Regards,
     Sasha