A New Internet-Draft is available from the on-line Internet-Drafts directories.
This draft is a work item of the Path Computation Element Working Group of the
IETF.
Title : Encoding of Objective Functions in the Path
Computation Element Communication Protocol (PCEP)
Author(s) : J. Le Roux, et al.
Filename : draft-ietf-pce-of-06.txt
Pages : 20
Date : 2008-12-27
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 objective functions
(e.g. minimum cost path, widest path, etc.).
In the Path Computation Element (PCE) architecture, 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.
This document defines objective function code types for six
objective functions previously listed in the PCE requirments work,
and provides the definition of four new metric types that apply to a
set of synchronized requests.
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