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PCE Communications Protocol Requirements PCE-PCC & PCE-PCE path response message MUST support returning various objects including (but not limited to): primary & alternate P2P paths explicit or strict/loose routing path primary & backup path (for FRR) less-constrained path (if cannot find path satisfying all constraints) indication of PCE inability to support service/constraint specify services/constraints PCE can support a cookie, in case path must be hidden |