Each of the primary, secondary standby, and secondary non-standby paths of the same LSP must use a separate PLSP-ID. In the PCE function of the NSP, the NRC-P checks the LSP IDENTIFIERS TLVs in the LSP object and can identify which PLSP-IDs are associated with the same LSP or the same RSVP session. The parameters are the following:
This approach allows the use of all the PCEP procedures for all three types of LSP paths.
The PCC indicates the following states for the path in the LSP object to the PCE: down, up (signaled but is not carrying traffic), or active (signaled and carrying traffic).
The PCE tracks active paths and displays them in the NSP GUI. It also provides only the tunnel ID of an active PLSP-ID to a specific destination prefix when a request is made by a service or a steering application.
The PCE recomputes the paths of all PLSP-IDs that are affected by a network event. The user can select each path separately on the NSP GUI and trigger a manual resignal of one or more paths of the LSP.