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In PCE+, the PCE server runs an Interior Gateway Protocol(IGP) to collect network-wide TE link information and runs PCEP to collect network-wide RSVP-TE LSP information. The PCE then uses the TE and LSP information to calculate paths for all routers on the network MPLS TE tunnels, however, are established and maintained using RSVP-TE running on PCCs.
Typeical PCE+ Service Scenario
