[rfc-dist] RFC 4927 on Path Computation Element Communication Protocol (PCECP) Specific Requirements for Inter-Area MPLS and GMPLS Traffic Engineering

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        RFC 4927

        Title:      Path Computation Element Communication Protocol 
                    (PCECP) Specific Requirements for Inter-Area MPLS 
                    and GMPLS Traffic Engineering 
        Author:     J.-L. Le Roux, Ed.
        Status:     Informational
        Date:       June 2007
        Mailbox:    jeanlouis.leroux at orange-ftgroup.com
        Pages:      12
        Characters: 25016
        Updates/Obsoletes/SeeAlso:   None

        I-D Tag:    draft-ietf-pce-pcecp-interarea-reqs-05.txt

        URL:        http://www.rfc-editor.org/rfc/rfc4927.txt

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.

This document is a product of the Path Computation Element
Working Group of the IETF.


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