PCE-initiated bypass LSPs

The Path Computation Element Protocol (PCEP) functionality is extended to allow a stateful Path Computation Element (PCE) to initiate, provision, and manage bypass label-switched paths (LSPs) for a protected interface. Multiple bypass LSPs with bandwidth reservation can be initiated by the PCE to protect a resource. With this feature, you can benefit from the LSP state synchronization of manual, dynamic, and PCE-initiated bypass LSPs from a PCE, and leverage on the PCE's global view of the network, resulting in better control over traffic at the time of a failure, and deterministic path computation of protection paths.