"The Path Computation Element (PCE) provides functions of path computation in support of traffic engineering (TE) in Multi-Protocol Label Switching (MPLS) and Generalized MPLS (GMPLS) networks. When a Path Computation Client (PCC) requests a PCE for a route@ it may be useful for the PCC to specify@ as constraints to the path computation@ abstract nodes@ resources@ and Shared Risk Link Groups (SRLGs) that are to be explicitly excluded from the computed route. Such constraints are termed ""route exclusions"". The PCE Communication Protocol (PCEP) is designed as a communication protocol between PCCs and PCEs. This document presents PCEP extensions for route exclusions."
RFC 5521-2009 history
2009RFC 5521-2009 Extensions to the Path Computation Element Communication Protocol (PCEP) for Route Exclusions