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Detailed requirements 1/3 Discovery of PCE location IP address (v4 or V6) to be used to reach the PCE => Typically a loopback address always reachable Discovery of PCE capabilities: Path related capabilities Capability to compute MPLS-TE, GMPLS paths Link/Path constraints that can be handled Supported optimization criteria Support for backup path computation … Path Computation Scope: intra-area, inter-area, inter-AS Domain IDs : Area IDs, AS Numbers… Path computation power … |