Path Computation Element (pce) ------------------------------ Charter Last Modified: 2011-12-09 Current Status: Active Working Group Chair(s): JP Vasseur Julien Meuric Routing Area Director(s): Stewart Bryant Adrian Farrel Routing Area Advisor: Adrian Farrel Secretary(ies): Daniel King Mailing Lists: General Discussion:pce@ietf.org 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 ------ ------- -------------------------------------------- Feb 2008 Jun 2011 Extensions to the Path Computation Element communication Protocol (PCEP) for Inter-Layer MPLS and GMPLS Traffic Engineering Jul 2009 Dec 2011 Conveying Vendor-Specific Constraints in the Path Computation Element Protocol Sep 2009 Oct 2011 PCEP Requirements for WSON Routing and Wavelength Assignment Sep 2010 Oct 2011 PCEP extensions for GMPLS Sep 2011 Oct 2011 PCE-based Computation Procedure To Compute Shortest Constrained P2MP Inter-domain Traffic Engineering Label Switched Paths Oct 2011 Oct 2011 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