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Assumptions PCE may or may not be located at head-end e.g. nodes on path contribute to path computation (e.g., loose hops) making them PCEs path computation may be made by PCE physically distinct from the computed path path computed by PCE may be complete: full explicit path of strict hops partial: mix of strict & loose hops (may be an abstract node such as an AS) PCE path computation can be used in conjunction with other path computation models e.g., inter-AS TE LSP may be computed using PCE in some domains but not others no assumptions made about PCE implementation e.g., could be implemented on a router, LSR, dedicated network server, etc. PCE function independent of forwarding capability of node on which it is implemente |