Path Computation Element (pce)

Path Computation Element (pce)
------------------------------

Charter
Last Modified: 2011-12-09

Current Status: Active Working Group

Chair(s):
JP Vasseur <[email protected]>
Julien Meuric <[email protected]>

Routing Area Director(s):
Stewart Bryant <[email protected]>
Adrian Farrel <[email protected]>

Routing Area Advisor:
Adrian Farrel <[email protected]>

Secretary(ies):
Daniel King <[email protected]>

Mailing Lists:
General Discussion:[email protected]
To Subscribe: http://www.ietf.org/mailman/listinfo/pce
Archive: http://www.ietf.org/mail-archive/web/pce/

Description of Working Group:

The PCE Working Group is chartered to specify the required protocols so
as to enable a Path Computation Element (PCE)-based architecture for the
computation of paths for MPLS and GMPLS Point to Point and Point to
Multi-point Traffic Engineered LSPs.

In this architecture path computation does not necessarily occur on the
head-end (ingress) LSR, but on some other path computation entity that
may physically not be located on each head-end LSR.

The PCE WG works on application of this model within a single domain
or within a group of domains (where a domain is a layer, IGP area or
Autonomous System with limited visibility from the head-end LSR). At
this time, applying this model to large groups of domains such as the
Internet is not thought to be possible, and the PCE WG will not spend
energy on that topic.

The WG specifies the PCE communication Protocol (PCEP) and needed
extensions for communication between LSRs (termed Path Computation
Clients - PCCs) and PCEs, and between cooperating PCEs. Security
mechanisms such as authentication and confidentiality are included.

The WG determines requirements for extensions to existing routing and
signaling protocols in support of the PCE architecture and the signaling
of inter-domain paths (e.g. RSVP-TE and its GMPLS variations). Any
necessary extensions will be produced in collaboration with the Working
Groups responsible for the protocols.

The WG also works on the mechanisms to for multi-layer path computation
and PCEP extensions for communication between several network layers.

The WG defines the required PCEP extensions for Wavelength Switched
Optical Networks (WSON) while keeping consistency with the GMPLS
architecture specified in the CCAMP WG.

Work Items:

- PCEP extensions for MPLS and GMPLS Traffic Engineered LSP path
computation models involving PCE(s). This includes the case of
computing the paths of intra and inter-domain TE LSPs. Such path
computation includes the generation of primary, protection and
recovery paths, as well as computations for (local/global)
reoptimization and load balancing. Both intra- and inter-domain
applications are covered.
- In cooperation with protocol specific Working Group (e.g., MPLS,
CCAMP), development of LSP signaling (RSVP-TE) extensions required
to support PCE-based path computation models.
- Specification of PCEP extensions for communication in the various
GMPLS-controlled networks, including WSON.
- Definition of PCEP extensions for path computation in multi-layer
networks.
Goals and Milestones:

Done Submit first draft of PCE architecture document

Done Submit first draft of PCE discovery requirements and protocol
extensions documents

Done Submit first draft of the PCE communication protocol
requirements

Done Submit first draft of the definition of objective metrics

Done Submit first draft of the PCE communication protocol
specification

Done Submit PCE architecture specification to the IESG to be
considered as Informational RFC

Done Submit first draft of the MIB module for the PCE protocol

Done Submit PCE communication protocol requirements to the IESG to
be considered as an Informational RFC

Done Submit PCE discovery protocol extensions specifications to the
IESG to be considered as a Proposed Standard

Done Submit PCE communication protocol specification to the IESG to
be considered as a Proposed Standard

Done Submit first draft of the PCE P2MP communication requirements

Done Submit first draft of the PCE P2MP PCEP protocol extensions

Done Submit PCE P2MP communication requirements to the IESG to be
considered as an Informational RFC

Done Submit PCE P2MP PCEP protocol extensions to the IESG to be
considered as an Proposed Standard RFC

Done Submit applicability and metrics documents to the IESG

Oct 2011 Submit WSON requirements to the IESG to be considered as an
Informational RFC

Dec 2011 Submit extensions for hierarchical PCE path computation model
as WG document

Jan 2012 Submit the PCEP MIB to the IESG to be considered as a Proposed
Standard

Jan 2012 Submit P2MP MIB as a WG document

Feb 2012 Submit the discovery MIB to the IESG to be considered as a
Proposed Standard

Feb 2012 Submit inter-layer extensions to the IESG to be considered as a
Proposed Standard

Mar 2012 Submit inter-area/AS applicability statement to the IESG as an
informational RFC

Mar 2012 Submit PCEP extensions for WSON as a WG document

Apr 2012 Submit the GMPLS requirements to the IESG to be considered as
an Informational RFC

Jun 2012 Submit PCEP extensions for GMPLS to the IESG to be considered
as a Proposed Standard

Aug 2012 Submit PCEP extensions for WSON to the IESG to be considered as
a Proposed Standard

Oct 2012 Submit P2MP MIB to the IESG to be considered as a Proposed
Standard

Feb 2013 Submit extensions for hierarchical model to the IESG to be
considered as a Proposed Standard

Mar 2013 Evaluate WG progress, recharter or close

Internet-Drafts:

Posted Revised I-D Title <Filename>
------ ------- --------------------------------------------
Feb 2008 Jan 2012 <draft-ietf-pce-inter-layer-ext-06.txt>
Extensions to the Path Computation Element communication
Protocol (PCEP) for Inter-Layer MPLS and GMPLS Traffic
Engineering

Jul 2009 Dec 2011 <draft-ietf-pce-vendor-constraints-05.txt>
Conveying Vendor-Specific Constraints in the Path Computation
Element Protocol

Sep 2009 Oct 2011 <draft-ietf-pce-wson-routing-wavelength-06.txt>
PCEP Requirements for WSON Routing and Wavelength Assignment

Sep 2010 Oct 2011 <draft-ietf-pce-gmpls-pcep-extensions-04.txt>
PCEP extensions for GMPLS

Sep 2011 Oct 2011 <draft-ietf-pce-pcep-inter-domain-p2mp-procedures-01.txt>
PCE-based Computation Procedure To Compute Shortest Constrained
P2MP Inter-domain Traffic Engineering Label Switched Paths

Oct 2011 Oct 2011 <draft-ietf-pce-hierarchy-fwk-00.txt>
The Application of the Path Computation Element Architecture to
the Determination of a Sequence of Domains in MPLS and GMPLS

Request For Comments:

RFC Stat Published Title
------- -- ----------- ------------------------------------
RFC4655 I Aug 2006 A Path Computation Element (PCE) Based Architecture

RFC4657 I Sep 2006 Path Computation Element (PCE) Communication Protocol
Generic Requirements

RFC4674 I Oct 2006 Requirements for Path Computation Element (PCE)
Discovery

RFC4927 I Jun 2007 PCE Communication Protocol (PCECP) Specific Requirements
for Inter-Area Multi Protocol Label Switching (MPLS) and
Generalized MPLS (GMPLS) Traffic Engineering

RFC5089 PS Jan 2008 IS-IS Protocol Extensions for Path Computation Element
(PCE) Discovery

RFC5088 PS Jan 2008 OSPF Protocol Extensions for Path Computation Element
(PCE) Discovery

RFC5376 I Nov 2008 Inter-AS Requirements for the Path Computation Element
Communication Protocol (PCECP)

RFC5394 I Dec 2008 Policy-Enabled Path Computation Framework

RFC5440 PS Mar 2009 Path Computation Element (PCE) Communication Protocol
(PCEP)

RFC5455 PS Mar 2009 Diff-Serv Aware Class Type Object for Path Computation
Element Communication Protocol

RFC5441 PS Apr 2009 A Backward Recursive PCE-Based Computation (BRPC)
Procedure To Compute Shortest Constrained Inter-Domain
Traffic Engineering Label Switched Paths

RFC5520 PS Apr 2009 Preserving Topology Confidentiality in Inter-Domain Path
Computation Using a Path-Key-Based Mechanism

RFC5521 PS Apr 2009 Extensions to the Path Computation Element Communication
Protocol (PCEP) for Route Exclusions

RFC5541 PS Jun 2009 Encoding of Objective Functions in the Path Computation
Element Communication Protocol (PCEP)

RFC5557 PS Jul 2009 Path Computation Element Communication Protocol (PCEP)
Requirements and Protocol Extensions in Support of
Global Concurrent Optimization

RFC5623 I Sep 2009 Framework for PCE-Based Inter-Layer MPLS and GMPLS
Traffic Engineering

RFC5671 I Oct 2009 Applicability of the Path Computation Element (PCE) to
Point-to-Multipoint (P2MP) Multiprotocol Label Switching
(MPLS) and Generalized MPLS (GMPLS) Traffic Engineering
(TE)

RFC5862 I Jun 2010 Path Computation Clients (PCC) - Path Computation
Element (PCE) Requirements for Point-to-Multipoint
MPLS-TE

RFC5886 PS Jun 2010 A Set of Monitoring Tools for Path Computation Element
(PCE)-Based Architecture

RFC6006 PS Sep 2010 Extensions to the Path Computation Element Communication
Protocol (PCEP) for Point-to-Multipoint Traffic
Engineering Label Switched Paths

RFC6007 I Sep 2010 Use of the Synchronization VECtor (SVEC) List for
Synchronized Dependent Path Computations

RFC6123 H Feb 2011 Inclusion of Manageability Sections in Path Computation
Element (PCE) Working Group Drafts

RFC6457 I Dec 2011 PCC-PCE Communication and PCE Discovery Requirements for
Inter-Layer Traffic Engineering