Extensions to Path Computation Element Communication Protocol (PCEP) for Hierarchical Path Computation Elements (PCE)
draft-ietf-pce-hierarchy-extensions-05

Document Type Active Internet-Draft (pce WG)
Last updated 2018-07-16
Replaces draft-zhang-pce-hierarchy-extensions
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PCE Working Group                                               F. Zhang
Internet-Draft                                                   Q. Zhao
Intended status: Standards Track                                  Huawei
Expires: January 16, 2019                            O. Gonzalez de Dios
                                                          Telefonica I+D
                                                             R. Casellas
                                                                    CTTC
                                                                 D. King
                                                      Old Dog Consulting
                                                           July 15, 2018

Extensions to Path Computation Element Communication Protocol (PCEP) for
              Hierarchical Path Computation Elements (PCE)
                 draft-ietf-pce-hierarchy-extensions-05

Abstract

   The Hierarchical Path Computation Element (H-PCE) architecture RFC
   6805, provides a mechanism to allow the optimum sequence of domains
   to be selected, and the optimum end-to-end path to be derived through
   the use of a hierarchical relationship between domains.

   This document defines the Path Computation Element Protocol (PCEP)
   extensions for the purpose of implementing necessary Hierarchical PCE
   procedures and protocol extensions.

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 16, 2019.

Zhang, et al.           Expires January 16, 2019                [Page 1]
Internet-Draft          PCEP Extensions for H-PCE              July 2018

Copyright Notice

   Copyright (c) 2018 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Scope . . . . . . . . . . . . . . . . . . . . . . . . . .   4
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   5
     1.3.  Requirements Language . . . . . . . . . . . . . . . . . .   5
   2.  Requirements for H-PCE  . . . . . . . . . . . . . . . . . . .   5
     2.1.  Path Computation Request  . . . . . . . . . . . . . . . .   5
       2.1.1.  Qualification of PCEP Requests  . . . . . . . . . . .   6
       2.1.2.  Multi-domain Objective Functions  . . . . . . . . . .   6
       2.1.3.  Multi-domain Metrics  . . . . . . . . . . . . . . . .   7
     2.2.  Parent PCE Capability Advertisement . . . . . . . . . . .   7
     2.3.  PCE Domain Discovery  . . . . . . . . . . . . . . . . . .   7
     2.4.  Domain Diversity  . . . . . . . . . . . . . . . . . . . .   8
   3.  PCEP Extensions . . . . . . . . . . . . . . . . . . . . . . .   8
     3.1.  OPEN object . . . . . . . . . . . . . . . . . . . . . . .   8
       3.1.1.  H-PCE capability TLV  . . . . . . . . . . . . . . . .   8
       3.1.2.  Domain-ID TLV . . . . . . . . . . . . . . . . . . . .   9
     3.2.  RP object . . . . . . . . . . . . . . . . . . . . . . . .  10
       3.2.1.  H-PCE-FLAG TLV  . . . . . . . . . . . . . . . . . . .  10
       3.2.2.  Domain-ID TLV . . . . . . . . . . . . . . . . . . . .  11
     3.3.  Objective Functions . . . . . . . . . . . . . . . . . . .  11
       3.3.1.  OF Codes  . . . . . . . . . . . . . . . . . . . . . .  11
       3.3.2.  OF Object . . . . . . . . . . . . . . . . . . . . . .  13
     3.4.  Metric Object . . . . . . . . . . . . . . . . . . . . . .  13
     3.5.  SVEC Object . . . . . . . . . . . . . . . . . . . . . . .  14
     3.6.  PCEP-ERROR object . . . . . . . . . . . . . . . . . . . .  14
       3.6.1.  Hierarchy PCE Error-Type  . . . . . . . . . . . . . .  14
     3.7.  NO-PATH Object  . . . . . . . . . . . . . . . . . . . . .  15
   4.  H-PCE Procedures  . . . . . . . . . . . . . . . . . . . . . .  15
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