Extensions to Path Computation Element Communication Protocol (PCEP) for Hierarchical Path Computation Elements (PCE)
draft-ietf-pce-hierarchy-extensions-04
PCE Working Group F. Zhang
Internet-Draft Q. Zhao
Intended status: Standards Track Huawei
Expires: September 6, 2018 O. Gonzalez de Dios
Telefonica I+D
R. Casellas
CTTC
D. King
Old Dog Consulting
March 5, 2018
Extensions to Path Computation Element Communication Protocol (PCEP) for
Hierarchical Path Computation Elements (PCE)
draft-ietf-pce-hierarchy-extensions-04
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
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provisions of BCP 78 and BCP 79.
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material or to cite them other than as "work in progress."
This Internet-Draft will expire on September 6, 2018.
Zhang, et al. Expires September 6, 2018 [Page 1]
Internet-Draft PCEP Extensions for H-PCE March 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 . . . . . . . . . . . 5
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 Discovery . . . . . . . . . . . . . . . . . . 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 . . . . . . . . . . . . . . . . . . . . . . 12
3.5. SVEC Object . . . . . . . . . . . . . . . . . . . . . . . 13
3.6. PCEP-ERROR object . . . . . . . . . . . . . . . . . . . . 13
3.6.1. Hierarchy PCE Error-Type . . . . . . . . . . . . . . 13
3.7. NO-PATH Object . . . . . . . . . . . . . . . . . . . . . 14
4. H-PCE Procedures . . . . . . . . . . . . . . . . . . . . . . 14
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