Encoding of Objective Functions in Path Computation Element (PCE) communication and discovery protocols
draft-leroux-pce-of-01

 
Document Type Replaced Internet-Draft (individual)
Last updated 2011-01-10 (latest revision 2007-07-11)
Replaced by draft-ietf-pce-of
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at
https://www.ietf.org/archive/id/draft-leroux-pce-of-01.txt

Abstract

The computation of one or a series of Traffic Engineering Label Switched Paths (TE LSP) in MultiProtocol Label Switching (MPLS) and Generalized MPLS (GMPLS) networks, is subject to a set of one or more specific optimization criteria(s), referred to as an objective function (e.g. minimum cost path, widest path, etc.). A Path Computation Element (PCE) may support one or multiple objective functions, and it is desired for a Path Computation Client (PCC) to automatically discover the set of objective functions supported by a PCE. Furthermore, it may be useful for a PCC to specify in a path computation request the required objective function used by the PCE to compute a TE LSP or a set of TE LSPs. Thus the aim of this document is to define extensions to the PCE Discovery (PCED) TLV carried within the IS-IS Router Capability TLV and the OSPF Router Information LSA so as to allow a PCC to discover the set of objective functions supported by a PCE. Extensions to the PCE communication Protocol (PCEP) are also specified allowing a PCC to indicate in a path computation request the required objective function and a PCE to indicate in a path computation reply the objective function actually applied.

Authors

Jean-Louis Le Roux (jeanlouis.leroux@francetelecom.com)

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)