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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
Filename : draft-ietf-pce-pcecp-interarea-reqs-04.txt
Pages : 11
Date : 2006-11-21
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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