@misc{rfc4927,
    series =    {Request for Comments},
    number =    4927,
    howpublished =  {RFC 4927},
    publisher = {RFC Editor},
    doi =       {10.17487/RFC4927},
    url =       {https://www.rfc-editor.org/info/rfc4927},
    author =    {Jean-Louis Le Roux},
    title =     {{Path Computation Element Communication Protocol (PCECP) Specific Requirements for Inter-Area MPLS and GMPLS Traffic Engineering}},
    pagetotal = 12,
    year =      2007,
    month =     jun,
    abstract =  {For scalability purposes, a network may comprise multiple Interior Gateway Protocol (IGP) areas. An inter-area Traffic Engineered Label Switched Path (TE-LSP) is an LSP that transits through at least two IGP areas. In a multi-area network, topology visibility remains local to a given area, and a head-end Label Switching Router (LSR) cannot compute an inter-area shortest constrained path. One key application of the Path Computation Element (PCE)-based architecture is the computation of inter-area TE-LSP paths. The PCE Communication Protocol (PCECP) is used to communicate computation requests from Path Computation Clients (PCCs) to PCEs, and to return computed paths in responses. This document lists a detailed set of PCECP-specific requirements for support of inter-area TE-LSP path computation. It complements the generic requirements for a PCE Communication Protocol. This memo provides information for the Internet community.},
}