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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-03.txt
Pages : 18
Date : 2008-7-17
The computation of one or a set 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, referred to as an objective function
(e.g. minimum cost path, widest path, etc.).
A Path Computation Client (PCC) may want a path to be computed for
one or more TE LSPs according to a specific objective function. Thus,
the PCC needs to instruct the PCE to use the correct objective
function. Furthermore, it is possible that not all PCEs support the
same set of objective functions, therefore it is useful for the PCC
to be able to automatically discover the set of objective functions
supported by each PCE.
This document defines extensions to the PCE communication Protocol
(PCEP) to allow a PCE to indicate the set of objective functions it
supports. Extensions are also defined so that a PCC can indicate in
a path computation request the required objective function, and so
that a PCE can report in a path computation reply the objective
function that was used for path computation.
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