GMPLS Operation

GMPLS requires close interaction between LMP, RSVP, and OSPF. The following sequence of events describes how GMPLS works:

LMP notifies RSVP and OSPF of the control peer, the control adjacency, and resources for the TE link.
GMPLS extracts the LSP attributes from the configuration and requests RSVP to signal one or more specific paths, specified by the TE link addresses.
RSVP determines the local TE link, corresponding control adjacency and active control channel, and transmission parameters (such as IP destination). It requests that LMP allocate a resource from the TE link with the specified attributes. If LMP successfully finds a resource matching the attributes, label allocation succeeds. RSVP sends a PathMsg hop-by-hop until it reaches the target router.
The target router, on receiving the RSVP PathMsg, requests that LMP allocate a resource based on the signaled parameters. If label allocation succeeds, it sends back a ResvMsg.
If the signaling is successful, an optical path is provisioned.