PCC/PCE Extension for RSVP-TE Local-Protection with PCE-Stateful

This feature introduces support for provisioning a bypass LSP for a protected interface and then modifying or deleting that bypass LSP from a controller by using PCEP. In a network where all LSPs have control delegated to a Path Computation Element (PCE), the PCE can apply global concurrent optimization to optimize LSP placement. The PCE can also control the timing and sequence of path computation and applying path changes. In a deployment where a PCE is used to compute all the paths, it may be beneficial for the protection paths to also be controlled through the PCE. Benefits of stateful synchronization and control of the protection paths include: * Better control over traffic after a failure and more deterministic path computation of protection paths. The PCE can optimize the protection path based on data not available to the Path Computation Client (PCC) - for instance, the PCE can make sure the protection path will not violate the target delay. * Satisfy more complex constraints and diversity requirements, such as maintaining diverse paths for LSPs as well as their local protection paths. * Given the PCE's global view of network resources, act as a form of LSP admission control into a protection path to ensure links are not overloaded during failure events. * On a point of local repair (PLR) with multiple available protection routes, allows the PCE to map LSPs to all available protection routes versus a single best protection route.