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PCE-Based Computation Procedure to Compute Shortest Constrained Point-to-Multipoint (P2MP) Inter-Domain Traffic Engineering Label Switched Paths
RFC 7334

Internet Engineering Task Force (IETF)                           Q. Zhao
Request for Comments: 7334                                      D. Dhody
Category: Experimental                                 Huawei Technology
ISSN: 2070-1721                                                  D. King
                                                      Old Dog Consulting
                                                                  Z. Ali
                                                           Cisco Systems
                                                             R. Casellas
                                                                    CTTC
                                                             August 2014

               PCE-Based Computation Procedure to Compute
      Shortest Constrained Point-to-Multipoint (P2MP) Inter-Domain
                Traffic Engineering Label Switched Paths

Abstract

   The ability to compute paths for constrained point-to-multipoint
   (P2MP) Traffic Engineering Label Switched Paths (TE LSPs) across
   multiple domains has been identified as a key requirement for the
   deployment of P2MP services in MPLS- and GMPLS-controlled networks.
   The Path Computation Element (PCE) has been recognized as an
   appropriate technology for the determination of inter-domain paths of
   P2MP TE LSPs.

   This document describes an experiment to provide procedures and
   extensions to the PCE Communication Protocol (PCEP) for the
   computation of inter-domain paths for P2MP TE LSPs.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for examination, experimental implementation, and
   evaluation.

   This document defines an Experimental Protocol for the Internet
   community.  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).  Not
   all documents approved by the IESG are a candidate for any level of
   Internet Standard; see 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/rfc7334.

Zhao, et al.                  Experimental                      [Page 1]
RFC 7334            PCEP P2MP Inter-Domain Procedures        August 2014

Copyright Notice

   Copyright (c) 2014 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
   Provisions Relating to IETF Documents
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Zhao, et al.                  Experimental                      [Page 2]
RFC 7334            PCEP P2MP Inter-Domain Procedures        August 2014

Table of Contents

   1. Introduction ....................................................4
      1.1. Scope ......................................................4
      1.2. Requirements Language ......................................4
   2. Terminology .....................................................5
   3. Examination of Existing Mechanisms ..............................6
   4. Assumptions .....................................................7
   5. Requirements ....................................................8
   6. Objective Functions and Constraints .............................9
   7. P2MP Path Computation Procedures ...............................10
      7.1. General ...................................................10
      7.2. Core-Trees ................................................10
      7.3. Optimal Core-Tree Computation Procedure ...................13
      7.4. Sub-tree Computation Procedures ...........................15
      7.5. PCEP Protocol Extensions ..................................15
           7.5.1. Extension of RP Object .............................15
           7.5.2. Domain and PCE Sequence ............................16
      7.6. Using H-PCE for Scalability ...............................16
      7.7. Parallelism ...............................................17
   8. Protection .....................................................17
      8.1. End-to-End Protection .....................................17

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