BGP Extensions for Path Computation Element (PCE) Discovery
draft-dong-pce-discovery-proto-bgp-00

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Network Working Group                                            J. Dong
Internet-Draft                                                   M. Chen
Intended status: Standards Track                     Huawei Technologies
Expires: January 1, 2015                                   June 30, 2014

      BGP Extensions for Path Computation Element (PCE) Discovery
                 draft-dong-pce-discovery-proto-bgp-00

Abstract

   In network scenarios where Path Computation Element (PCE) is used for
   centralized path computation, it is desirable for Path Computation
   Clients (PCCs) to automatically discover the set of PCEs.  As BGP has
   been extended for north-bound distribution of routing and LSP path
   information to PCE, the PCEs may not participate in Interior Gateway
   Protocol (IGP) for collecting the routing information, thus the IGP
   based PCE discovery cannot be used directly in these scenarios.  This
   document specifies the BGP extensions for PCE discovery.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in RFC 2119 [RFC2119].

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

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   This Internet-Draft will expire on January 1, 2015.

Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Dong & Chen              Expires January 1, 2015                [Page 1]
Internet-Draft      BGP Extensions for PCE Discovery           June 2014

   This document is subject to BCP 78 and the IETF Trust's Legal
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   (http://trustee.ietf.org/license-info) in effect on the date of
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Carrying PCE Discovery Information in BGP . . . . . . . . . .   3
     2.1.  PCE Address Information . . . . . . . . . . . . . . . . .   3
     2.2.  PCE Discovery Attribute . . . . . . . . . . . . . . . . .   4
   3.  Operational Considerations  . . . . . . . . . . . . . . . . .   5
   4.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   6.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .   5
   7.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     7.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     7.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   In network scenarios where Path Computation Element (PCE) is used for
   centralized path computation, it is desirable for Path Computation
   Clients (PCCs) to automatically discover the set of PCEs.  As BGP
   will be used for north-bound distribution of routing and Label
   Switched Path (LSP) information to PCE[I-D.ietf-idr-ls-distribution]
   [I-D.ietf-idr-te-lsp-distribution] [I-D.ietf-idr-te-pm-bgp], the PCEs
   may not participate in Interior Gateway Protocol (IGP) for collecting
   the routing information, thus the IGP based PCE discovery mechanisms
   defined in [RFC5088] [RFC5089] cannot be used directly.

   This document proposes to extend BGP for PCE discovery in such
   scenarios.  While in each IGP domain, the IGP based PCE discovery
   mechanism may be used in conjunction with the BGP based PCE
   discovery.  Thus the BGP based PCE discovery is complemental to the
   existing IGP based mechanisms.

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                                   +---------+
                                   |   PCE   |
                                   +---------+
                                      ^  |
                                      |  |
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