Extensions to the Path Computation Element Communication Protocol (PCEP) for Point-to-Multipoint Traffic Engineering Label Switched Paths
RFC 6006

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Internet Engineering Task Force (IETF)                      Q. Zhao, Ed.
Request for Comments: 6006                             Huawei Technology
Category: Standards Track                                   D. King, Ed.
ISSN: 2070-1721                                       Old Dog Consulting
                                                            F. Verhaeghe
                                             Thales Communication France
                                                               T. Takeda
                                                         NTT Corporation
                                                                  Z. Ali
                                                     Cisco Systems, Inc.
                                                               J. Meuric
                                                          France Telecom
                                                          September 2010

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

Abstract

   Point-to-point Multiprotocol Label Switching (MPLS) and Generalized
   MPLS (GMPLS) Traffic Engineering Label Switched Paths (TE LSPs) may
   be established using signaling techniques, but their paths may first
   need to be determined.  The Path Computation Element (PCE) has been
   identified as an appropriate technology for the determination of the
   paths of point-to-multipoint (P2MP) TE LSPs.

   This document describes extensions to the PCE communication Protocol
   (PCEP) to handle requests and responses for the computation of paths
   for P2MP TE LSPs.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc6006.

Zhao, et al.                 Standards Track                    [Page 1]
RFC 6006           Extensions to PCEP for P2MP TE LSPs    September 2010

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Table of Contents

   1. Introduction ....................................................3
      1.1. Terminology ................................................4
      1.2. Requirements Language ......................................5
   2. PCC-PCE Communication Requirements ..............................5
   3. Protocol Procedures and Extensions ..............................6
      3.1. P2MP Capability Advertisement ..............................6
           3.1.1. P2MP Computation TLV in the Existing PCE
                  Discovery Protocol ..................................6
           3.1.2. Open Message Extension ..............................7
      3.2. Efficient Presentation of P2MP LSPs ........................7
      3.3. P2MP Path Computation Request/Reply Message Extensions .....8
           3.3.1. The Extension of the RP Object ......................8
           3.3.2. The New P2MP END-POINTS Object ......................9
      3.4. Request Message Format ....................................12
      3.5. Reply Message Format ......................................12
      3.6. P2MP Objective Functions and Metric Types .................13