PCC/PCE Managed RSVP TE

This feature introduces support for Path Computation Element (PCE)-controlled and PCE-initiated (collectively called PCE-managed) RSVP-TE LSPs: * PCE-controlled LSPs-The LSPs that have the lsp-external-controller pccd statement configured are called PCE-controlled LSPs. The Path Computation Client (PCC) delegates the PCC-initiated LSPs to the main PCE for external path computation. The PCC informs the PCE about the configured parameters of a PCE-controlled LSP, such as bandwidth, Explicit Route Object (ERO), and priorities. It also informs the PCE about the actual values used for these parameters to set up the LSP including the Record Route Object (RRO), when available. The PCC sends such LSP status reports to the PCE only when a reconfiguration has occurred or when there is a change in the ERO, RRO, or status of the PCE-controlled LSPs under external control. * PCE-initiated LSPs-The LSPs that have the lsp-provisioning statement configured are called PCE-initiated LSPs. A PCE-initiated LSP is dynamically created by an external PCE; as a result, there is no LSP configuration present on the PCC. The PCC creates the PCE-initiated LSP using the parameters provided by the PCE, and automatically delegates the LSP to the PCE.