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This draft is a work item of the Path Computation Element Working Group of the IETF.
Title : Encoding of Objective Functions in Path Computation Element communication Protocol (PCEP)
Author(s) : J. Le Roux
Filename : draft-ietf-pce-of-02.txt
Pages : 17
Date : 2008-2-27
The computation of one or a series of Traffic Engineering Label
Switched Paths (TE LSPs) 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 to be 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 communication Protocol
(PCEP) in order to allow a PCC to discover the set of objective
functions supported by a PCE as well as to allow 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 that
was used for path computation.
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