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 IPv4 Tunnel Sender Address, the Tunnel ID, the Extended Tunnel ID, and the IPv4 Tunnel Endpoint Address. This approach allows the use of all the PCEP procedures for all three types of LSP paths.
PCC indicates to PCE the following states for the path in the LSP object: down, up (signaled but is not carrying traffic), or active (signaled and carrying traffic).
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.
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.