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PCE Communications Protocol Requirements PCE communication protocol MUST support operation in various SP/networking environments IP-MPLS, GMPLS, & optical networks P2P path computation intra/inter-domain & inter-layer path computation inter-layer reconfiguration & path setup/release path computation triggered by higher-layer PCC, PCE, or lower-layer PCC PCE optionally triggers inter-layer path computation based on traffic/topology change or failure lower-layer path established/released if necessary use (optional) support setup/release request/reply messages centralized & distributed computation model single & multiple PCE path computation external PCE node stateful & stateless PCEs synchronized & non-synchronized PCE |