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Path Computation Element Communication Protocol (PCEP) Requirements and Protocol Extensions in Support of Global Concurrent Optimization
RFC 5557

Network Working Group                                             Y. Lee
Request for Comments: 5557                                        Huawei
Category: Standards Track                                    JL. Le Roux
                                                          France Telecom
                                                                 D. King
                                                      Old Dog Consulting
                                                                  E. Oki
                                    University of Electro Communications
                                                               July 2009

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

Abstract

   The Path Computation Element Communication Protocol (PCEP) allows
   Path Computation Clients (PCCs) to request path computations from
   Path Computation Elements (PCEs), and lets the PCEs return responses.
   When computing or reoptimizing the routes of a set of Traffic
   Engineering Label Switched Paths (TE LSPs) through a network, it may
   be advantageous to perform bulk path computations in order to avoid
   blocking problems and to achieve more optimal network-wide solutions.
   Such bulk optimization is termed Global Concurrent Optimization
   (GCO).  A GCO is able to simultaneously consider the entire topology
   of the network and the complete set of existing TE LSPs, and their
   respective constraints, and look to optimize or reoptimize the entire
   network to satisfy all constraints for all TE LSPs.  A GCO may also
   be applied to some subset of the TE LSPs in a network.  The GCO
   application is primarily a Network Management System (NMS) solution.

   This document provides application-specific requirements and the PCEP
   extensions in support of GCO applications.

Status of This Memo

   This document specifies an Internet standards track protocol for the
   Internet community, and requests discussion and suggestions for
   improvements.  Please refer to the current edition of the "Internet
   Official Protocol Standards" (STD 1) for the standardization state
   and status of this protocol.  Distribution of this memo is unlimited.

Lee, et al.                 Standards Track                     [Page 1]
RFC 5557    PCEP Requirements & Protocol Extensions for GCO    July 2009

Copyright Notice

   Copyright (c) 2009 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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   Please review these documents carefully, as they describe your rights
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   This document may contain material from IETF Documents or IETF
   Contributions published or made publicly available before November
   10, 2008.  The person(s) controlling the copyright in some of this
   material may not have granted the IETF Trust the right to allow
   modifications of such material outside the IETF Standards Process.
   Without obtaining an adequate license from the person(s) controlling
   the copyright in such materials, this document may not be modified
   outside the IETF Standards Process, and derivative works of it may
   not be created outside the IETF Standards Process, except to format
   it for publication as an RFC or to translate it into languages other
   than English.

Lee, et al.                 Standards Track                     [Page 2]
RFC 5557    PCEP Requirements & Protocol Extensions for GCO    July 2009

Table of Contents

   1. Introduction ....................................................4
   2. Terminology .....................................................6
   3. Applicability of Global Concurrent Optimization (GCO) ...........6
      3.1. Application of the PCE Architecture ........................7
      3.2. Greenfield Optimization ....................................8
           3.2.1. Single-Layer Traffic Engineering ....................8
           3.2.2. Multi-Layer Traffic Engineering .....................8
      3.3. Reoptimization of Existing Networks ........................8
           3.3.1. Reconfiguration of the Virtual Network
                  Topology (VNT) ......................................9
           3.3.2. Traffic Migration ...................................9
   4. PCECP Requirements .............................................10
   5. Protocol Extensions for Support of Global Concurrent
      Optimization ...................................................13
      5.1. Global Objective Function (GOF) Specification .............14

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