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Path Computation Element Communication Protocol (PCEP) Extension for Label Switched Path (LSP) Diversity Constraint Signaling

This document introduces a simple mechanism to associate a group of
Label Switched Paths (LSPs) via an extension to the Path Computation
Element (PCE) communication Protocol (PCEP) with the purpose of
computing diverse (disjointed) paths for those LSPs. The proposed
extension allows a Path Computation Client (PCC) to advertise to a PCE
that a particular LSP belongs to a particular disjoint-group, thus the
PCE knows that the LSPs in the same group need to be disjoint from
each other.