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Terminology path computation element (PCE) entity (component, application or network node) capable of computing a network path based on network graph & computational constraints e.g., PCE computes path of a TE LSP by using TED & bandwidth/other constraints path computation client (PCC) any client application requesting a path computation by the PCE domain any collection of network elements within a common sphere of address management or path computational responsibility e.g., IGP areas, AS, multiple ASs within a SP network, multiple ASs across multiple SP networks single PCE path computation: single PCE computes a path in a domain multiple PCE path computation: multiple PCEs compute a path in a domain centralized computation model: all paths in a domain computed by a single, centralized PCE distributed computation model: computation of paths in a domain shared among multiple PCEs |