Extensions to Path Computation Element Communication Protocol (PCEP) for Hierarchical Path Computation Elements (PCE)
draft-ietf-pce-hierarchy-extensions-08

Document Type Active Internet-Draft (pce WG)
Last updated 2018-12-06
Replaces draft-zhang-pce-hierarchy-extensions
Stream IETF
Intended RFC status Proposed Standard
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PCE Working Group                                               F. Zhang
Internet-Draft                                                   Q. Zhao
Intended status: Standards Track                                  Huawei
Expires: June 7, 2019                                O. Gonzalez de Dios
                                                          Telefonica I+D
                                                             R. Casellas
                                                                    CTTC
                                                                 D. King
                                                      Old Dog Consulting
                                                        December 6, 2018

Extensions to Path Computation Element Communication Protocol (PCEP) for
              Hierarchical Path Computation Elements (PCE)
                 draft-ietf-pce-hierarchy-extensions-08

Abstract

   The Hierarchical Path Computation Element (H-PCE) architecture is
   defined in RFC 6805.  It provides a mechanism to derive an optimum
   end-to-end path in a multi-domain environment by using a hierarchical
   relationship between domains to select the optimum sequence of
   domains and optimum paths across those domains.

   This document defines extensions to the Path Computation Element
   Protocol (PCEP) to support Hierarchical PCE procedures.

Status of This Memo

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

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on June 7, 2019.

Copyright Notice

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

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

   This document is subject to BCP 78 and the IETF Trust's Legal
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
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   described in the Simplified BSD License.

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  . . . . . . . . . . . . . . . .6
     2.2.  Parent PCE Capability Advertisement . . . . . . . . . . .7
     2.3.  PCE Domain Identification . . . . . . . . . . . . . . . .7
     2.4.  Domain Diversity  . . . . . . . . . . . . . . . . . . . .7
   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 . . . . . . . . . . . . . . . . . . . .10
     3.3.  Objective Functions . . . . . . . . . . . . . . . . . . .11
       3.3.1.  OF Codes  . . . . . . . . . . . . . . . . . . . . . .11
       3.3.2.  OF Object . . . . . . . . . . . . . . . . . . . . . .12
     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  . . . . . . . . . . . . . . . . . . . . .14
   4.  H-PCE Procedures  . . . . . . . . . . . . . . . . . . . . . .15
     4.1.  OPEN Procedure between Child PCE and Parent PCE . . . . .15
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