[Pce] I-D ACTION:draft-ietf-pce-pcecp-interarea-reqs-05.txt

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This draft is a work item of the Path Computation Element Working Group of the IETF.

	Title		: PCE Communication Protocol (PCECP) Specific
                          Requirements for Inter-Area Multi Protocol 
                          Label Switching (MPLS) and Generalized MPLS (GMPLS) Traffic Engineering
	Author(s)	: J. Le Roux, et al.
	Filename	: draft-ietf-pce-pcecp-interarea-reqs-05.txt
	Pages		: 11
	Date		: 2006-12-29

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 (PCC) 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.

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