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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
PPT Version