Extensions to Path Computation Element Communication Protocol (PCEP) for Hierarchical Path Computation Elements (PCE)
draft-ietf-pce-hierarchy-extensions-06
PCE Working Group F. Zhang
Internet-Draft Q. Zhao
Intended status: Standards Track Huawei
Expires: May 6, 2019 O. Gonzalez de Dios
Telefonica I+D
R. Casellas
CTTC
D. King
Old Dog Consulting
November 5, 2018
Extensions to Path Computation Element Communication Protocol (PCEP) for
Hierarchical Path Computation Elements (PCE)
draft-ietf-pce-hierarchy-extensions-06
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
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This Internet-Draft will expire on May 6, 2019.
Copyright Notice
Copyright (c) 2018 IETF Trust and the persons identified as the
document authors. All rights reserved.
Zhang, et al. Expires May, 2019 [Page 1]
Internet-Draft PCEP Extensions for H-PCE November 2018
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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 . . . . . . . . . . . . . . . .6
2.2. Parent PCE Capability Advertisement . . . . . . . . . . .6
2.3. PCE Domain Identification . . . . . . . . . . . . . . . .7
2.4. Domain Diversity . . . . . . . . . . . . . . . . . . . .7
3. PCEP Extensions . . . . . . . . . . . . . . . . . . . . . . .7
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 . . . . . . . . . . . . . . . . . . . . . . .13
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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