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PCE Communications Protocol Requirements PCC-PCE & PCE-PCE path request message MUST support ability to prefer/customize various path computation algorithms & policies shortest intra/inter-domain TE paths not require full graph to compute shortest/diverse path recursive CSPF computation reoptimization for intra/inter-domain TE paths complex routing requiring high CPU & memory multiple constraints, e.g. bounded delay minimum cost path backup path computation QoS CAC |