[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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Tue Jun 26 16:03:36 PDT 2007
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Title: Path Computation Element Communication Protocol
(PCECP) Specific Requirements for Inter-Area MPLS
and GMPLS Traffic Engineering
Author: J.-L. Le Roux, Ed.
Date: June 2007
Mailbox: jeanlouis.leroux at orange-ftgroup.com
I-D Tag: draft-ietf-pce-pcecp-interarea-reqs-05.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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