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PCE Communications Protocol Requirements PCE communication protocol MUST support communication between PCC-PCE & PCE-PCE in (G)MPLS networks one protocol for both cases reliable message exchange reliable transport request-response message exchange security of PCC-PCE & PCE-PCE messages encryption for some data fields, prevent snooping authentication, prevent spoofing DoS protection confidentiality of PCE communication messages, possibly across multiple domains little coordination of SP internal topology use loose routes replace ERO segment with cookie entry point to domain consults local PCE using cookie to retrieve next ERO segment |