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GMPLS Operation
The basic functionality of GMPLS requires close interaction between RSVP and LMP. It works in the following sequence:
- LMP notifies RSVP of the new entities:
- Traffic engineering link (forwarding adjacency)
- Resources available for the traffic engineering link
- Control peer
- GMPLS extracts the LSP attributes from the configuration and requests RSVP to signal one or more specific paths, which are specified by the traffic engineering link addresses.
- RSVP determines the local traffic engineering link, corresponding control adjacency and active control channel, and transmission parameters (such as IP destination). It requests that LMP allocate a resource from the traffic engineering link with the specified attributes. If LMP finds a resource matching the attributes, label allocation succeeds. RSVP sends a PathMsg hop by hop until it reaches the target router.
- When the target router receives the PathMsg, RSVP again requests that LMP allocate a resource based on the signaled parameters. If label allocation succeeds, the router sends back a ResvMsg.
- If the signaling is successful, a bidirectional optical path is provisioned.
