The MPLS WG Archive

[Kireeti Kompella <kireeti@juniper.net>]

Hi Alan,

> Let's assume the lambda-switched paths are unnumbered and are assigned
> "interface" indices as per the unnumbered draft.  When LSR-B receives
> an ERO with the "Interface ID" subobject, how is the association made
> with the correct lambda-switched path for timeslot allocation?

Excellent question.  The implicit assumption was that with out-of-band
signalling, some other means of identifying the links is used (e.g., a
variant of LMP).  I.e., LSR-A knows (per the ERO) which FA
(lambda-switched path) to use.  LSR-A and LSR-B have already identified
the links (e.g., with some variant of LMP).  LSR-A then sends the Path
message with a Link ID object (from the bundling document) to let LSR-B
know which FA LSR-A wants to use.

However, this is not altogether satisfactory (variant of LMP, etc).
An alternate solution is being worked on.

Kireeti.