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PCE Communications Protocol Requirements PCC-PCE & PCE-PCE path request message MUST support carrying various constraints including (but not limited to): path source/destination desired bandwidth, minimum bandwidth, QoS parameters (e.g., hop count, delay, preemption priority, etc.) diversity, SRLGs, optical impairments, wavelengh continuity maximum number of paths number of disjoint paths required if near-disjoint paths acceptable loose path to be expanded path previously returned (useful for stateless PCEs) link/node protection capability multiple correlated paths for protection |