The MPLS WG Archive

["Kullberg, Alan" <akullber@netplane.com>]

I have a question regarding the generalized MPLS signaling draft.


     A                   B
      \                 /
       \               /
        1------2------3

In the above picture, LSRs A and B are at the edges of an optical
network, and LSRs 1, 2, and 3 are optical switches.  LSR-A has
previously setup 2 Lambda LSPs to LSR-B.  LSR-A then wants to
"label stack" on one of those Lambdas to LSR-B by requesting a
timeslot from one of the Lambda LSPs.  When LSR-A sends a
REQUEST/PATH message to LSR-B, how do LSR-A and LSR-B coordinate
the timeslot allocation so that LSR-A sends the data in the
timeslot on the correct Lambda?  Assume that signaling occurs
out of band.

It seems that LSR-A needs to send some indication to LSR-B, like
the 6-octet LSPID of the corresponding Lambda LSP, so that LSR-B
allocates a timeslot from the correct Lambda.

Thanks,

Alan