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Inter-AS Requirements for the Path Computation Element Communication Protocol (PCECP)
RFC 5376

Network Working Group                                           N. Bitar
Request for Comments: 5376                                       Verizon
Category: Informational                                         R. Zhang
                                                                      BT
                                                               K. Kumaki
                                                           KDDI R&D Labs
                                                           November 2008

                     Inter-AS Requirements for the
        Path Computation Element Communication Protocol (PCECP)

Status of This Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Copyright Notice

   Copyright (c) 2008 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
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   to this document.

Abstract

   Multiprotocol Label Switching Traffic Engineered (MPLS TE) Label
   Switched Paths (LSPs) may be established wholly within an Autonomous
   System (AS) or may cross AS boundaries.

   The Path Computation Element (PCE) is a component that is capable of
   computing constrained paths for (G)MPLS TE LSPs.  The PCE
   Communication Protocol (PCECP) is defined to allow communication
   between Path Computation Clients (PCCs) and PCEs, as well as between
   PCEs.  The PCECP is used to request constrained paths and to supply
   computed paths in response.  Generic requirements for the PCECP are
   set out in "Path Computation Element (PCE) Communication Protocol
   Generic Requirements", RFC 4657.  This document extends those
   requirements to cover the use of PCECP in support of inter-AS MPLS
   TE.

Bitar, et al.                Informational                      [Page 1]
RFC 5376            Inter-AS Requirements for PCECP        November 2008

Table of Contents

   1. Introduction ....................................................3
   2. Terminology .....................................................3
   3. Reference Model .................................................4
      3.1. Scope of Deployment Model ..................................5
   4. Detailed PCECP Requirements for Inter-AS G(MPLS) TE Path
      Computation .....................................................6
      4.1. PCE Communication Protocol Requirements ....................6
           4.1.1. Requirements for Path Computation Requests ..........6
           4.1.2. Requirements for Path Computation Responses .........7
      4.2. Scalability and Performance Considerations .................8
      4.3. Management Considerations ..................................8
      4.4. Confidentiality ............................................9
      4.5. Policy Controls Affecting Inter-AS PCECP ...................9
           4.5.1. Inter-AS PCE Peering Policy Controls ...............10
           4.5.2. Inter-AS PCE Re-Interpretation Policies ............10
   5. Security Considerations ........................................10
      5.1. Use and Distribution of Keys ..............................11
      5.2. Application of Policy .....................................11
      5.3. Confidentiality ...........................................12
      5.4. Falsification of Information ..............................12
   6. Acknowledgments ................................................12
   7. Normative References ...........................................13
   8. Informative References .........................................13

Bitar, et al.                Informational                      [Page 2]
RFC 5376            Inter-AS Requirements for PCECP        November 2008

1.  Introduction

   [RFC4216] defines the scenarios motivating the deployment of inter-AS
   Multiprotocol Label Switching Traffic Engineering (MPLS TE) and
   specifies the requirements for inter-AS MPLS TE when the ASes are
   under the administration of one Service Provider (SP) or the
   administration of different SPs.

   Three signaling options are defined for setting up an inter-AS TE
   Label Switched Path (LSP):

       1) contiguous TE LSP as documented in [RFC5151];
       2) stitched inter-AS TE LSP discussed in [RFC5150];
       3) nested TE LSP as in [RFC4206].

   [RFC5152] defines mechanisms for the computation of inter-domain TE
   LSPs using network elements along the signaling paths to compute

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