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Path Computation Clients (PCC) - Path Computation Element (PCE) Requirements for Point-to-Multipoint MPLS-TE
RFC 5862

Internet Engineering Task Force (IETF)                       S. Yasukawa
Request for Comments: 5862                               NTT Corporation
Category: Informational                                        A. Farrel
ISSN: 2070-1721                                       Old Dog Consulting
                                                               June 2010

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

Abstract

   The Path Computation Element (PCE) provides path computation
   functions in support of traffic engineering in Multiprotocol Label
   Switching (MPLS) and Generalized MPLS (GMPLS) networks.

   Extensions to the MPLS and GMPLS signaling and routing protocols have
   been made in support of point-to-multipoint (P2MP) Traffic Engineered
   (TE) Label Switched Paths (LSPs).  The use of PCE in MPLS networks is
   already established, and since P2MP TE LSP routes are sometimes
   complex to compute, it is likely that PCE will be used for P2MP LSPs.

   Generic requirements for a communication protocol between Path
   Computation Clients (PCCs) and PCEs are presented in RFC 4657, "Path
   Computation Element (PCE) Communication Protocol Generic
   Requirements".  This document complements the generic requirements
   and presents a detailed set of PCC-PCE communication protocol
   requirements for point-to-multipoint MPLS/GMPLS traffic engineering.

Status of This Memo

   This document is not an Internet Standards Track specification; it is
   published for informational purposes.

   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/rfc5862.

Yasukawa & Farrel             Informational                     [Page 1]
RFC 5862                PCC-PCE and P2MP MPLS-TE               June 2010

Copyright Notice

   Copyright (c) 2010 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.

1.  Introduction

   The Path Computation Element (PCE) defined in [RFC4655] is an entity
   that is capable of computing a network path or route based on a
   network graph, and applying computational constraints.  The intention
   is that the PCE is used to compute the path of Traffic Engineered
   Label Switched Paths (TE LSPs) within Multiprotocol Label Switching
   (MPLS) and Generalized MPLS (GMPLS) networks.

   Requirements for point-to-multipoint (P2MP) MPLS TE LSPs are
   documented in [RFC4461], and signaling protocol extensions for
   setting up P2MP MPLS TE LSPs are defined in [RFC4875].  P2MP MPLS TE
   networks are considered in support of various features, including
   layer 3 multicast virtual private networks [RFC4834].

   Path computation for P2MP TE LSPs presents a significant challenge,
   and network optimization of multiple P2MP TE LSPs requires
   considerable computational resources.  PCE offers a way to offload
   such path computations from Label Switching Routers (LSRs).

   The applicability of the PCE-based path computation architecture to
   P2MP MPLS TE is described in a companion document [RFC5671].  No
   further attempt is made to justify the use of PCE for P2MP MPLS TE
   within this document.

   This document presents a set of PCC-PCE communication protocol
   (PCECP) requirements for P2MP MPLS traffic engineering.  It
   supplements the generic requirements documented in [RFC4657].

Yasukawa & Farrel             Informational                     [Page 2]
RFC 5862                PCC-PCE and P2MP MPLS-TE               June 2010

2.  Conventions Used in This Document

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",

[include full document text]