Path Computation Element Protocol (PCEP) support for color

The Path Computation Element Protocol (PCEP) supports color for colored segment routing LSPs. This includes Path Computation Element (PCE)-initiated, Path Computation Client (PCC)-controlled, and PCC-delegated segment routing LSPs. With this PCEP extension, you can configure candidate paths based on color and endpoints, where the active candidate path is the path with the highest segment routing preference, or based on source priority.