PCEP Link State Abstraction
draft-chen-pce-h-connect-access-06

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PCE Working Group                                                H. Chen
Internet-Draft                                                 Futurewei
Intended status: Standards Track                                  M. Toy
Expires: July 9, 2020                                            Verizon
                                                                  X. Liu
                                                          Volta Networks
                                                                  L. Liu
                                                                 Fujitsu
                                                                   Z. Li
                                                            China Mobile
                                                         January 6, 2020

                      PCEP Link State Abstraction
                   draft-chen-pce-h-connect-access-06

Abstract

   This document presents extensions to the Path Computation Element
   Communication Protocol (PCEP) for a child PCE to abstract its domain
   information to its parent for supporting a hierarchical PCE system.

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   This Internet-Draft will expire on July 9, 2020.

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   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal
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Chen, et al.              Expires July 9, 2020                  [Page 1]
Internet-Draft              H-Connect-Access                January 2020

   carefully, as they describe your rights and restrictions with respect
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Conventions Used in This Document . . . . . . . . . . . . . .   3
   4.  Connections and Accesses  . . . . . . . . . . . . . . . . . .   3
     4.1.  Information on Inter-domain Link  . . . . . . . . . . . .   4
     4.2.  Information on ABR  . . . . . . . . . . . . . . . . . . .   5
     4.3.  Information on Access Point . . . . . . . . . . . . . . .   5
   5.  Extensions to PCEP  . . . . . . . . . . . . . . . . . . . . .   5
     5.1.  Messages for Abstract Information . . . . . . . . . . . .   6
     5.2.  Procedures  . . . . . . . . . . . . . . . . . . . . . . .   6
       5.2.1.  Child Procedures  . . . . . . . . . . . . . . . . . .   6
       5.2.2.  Parent Procedures . . . . . . . . . . . . . . . . . .   9
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  10
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  10
   8.  Acknowledgement . . . . . . . . . . . . . . . . . . . . . . .  10
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  10
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  10
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  11
   Appendix A.  Message Encoding . . . . . . . . . . . . . . . . . .  12
     A.1.  Extension to Existing Message . . . . . . . . . . . . . .  12
       A.1.1.  TLVs  . . . . . . . . . . . . . . . . . . . . . . . .  12
       A.1.2.  Sub-TLVs  . . . . . . . . . . . . . . . . . . . . . .  13
     A.2.  New Message . . . . . . . . . . . . . . . . . . . . . . .  14
       A.2.1.  CONNECTION and ACCESS Object  . . . . . . . . . . . .  14
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  16

1.  Introduction

   A hierarchical PCE architecture is described in RFC 6805, in which a
   parent PCE maintains an abstract domain topology, which contains its
   child domains (seen as vertices in the topology) and the connections
   among them.

   For a domain for which a child PCE is responsible, connections
   attached to the domain may comprise inter-domain links and Area
   Border Routers (ABRs).  For a parent PCE to have the abstract domain