Doubt in ccamp-gmpls-sdh-sonet-01.txt

["manoj juneja" <manojkumarjuneja@hotmail.com>]

Hi All,

        In draft ccamp-gmpls-sonet-sdh-01.txt, concept of hierarchical
sonet/sdh LSPs has been described. It mentions that the higher order
sdh/sonet LSP behaves as a virtual link with a given bandwidth (e.g. VC
-3). A lower order SDH/SONET LSP can be established through that higher
LSP. For e.g. VC-3 LSP can be advertised as a FA. In this case all
labels allocated between two ends of that LSP will have S, U and K set
to ZERO i.e. non-significant while L and M will be used to indicate the
signal allocated in that VC-3.
Please clarify how the higher order LSP will be established ? Once the
higher order LSP gets established, the lower order signals within
higher order signals will also gets allocated. Then how can I again
allocate the lower order signals ?

Is this the reason for having bandwidth encdoing parameter in GMPLS
signalling (i.e. establishment of hierarchical SDH/SONET LSPs) ?

Regards,
manoj.

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