Path Computation Element Communication Protocol (PCEP) Extensions for the Hierarchical Path Computation Element (H-PCE) Architecture
RFC 8685
Internet Engineering Task Force (IETF) F. Zhang
Request for Comments: 8685 Q. Zhao
Category: Standards Track Huawei
ISSN: 2070-1721 O. Gonzalez de Dios
Telefonica I+D
R. Casellas
CTTC
D. King
Old Dog Consulting
December 2019
Path Computation Element Communication Protocol (PCEP) Extensions
for the Hierarchical Path Computation Element (H-PCE) Architecture
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
Communication Protocol (PCEP) to support H-PCE procedures.
Status of This Memo
This is an Internet Standards Track document.
This document is a product of the Internet Engineering Task Force
(IETF). It represents the consensus of the IETF community. It has
received public review and has been approved for publication by the
Internet Engineering Steering Group (IESG). Further information on
Internet Standards is available in Section 2 of RFC 7841.
Information about the current status of this document, any errata,
and how to provide feedback on it may be obtained at
https://www.rfc-editor.org/info/rfc8685.
Copyright Notice
Copyright (c) 2019 IETF Trust and the persons identified as the
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Table of Contents
1. Introduction
1.1. Scope
1.2. Terminology
1.3. Requirements Language
2. Requirements for the H-PCE Architecture
2.1. Path Computation Requests
2.1.1. Qualification of PCEP Requests
2.1.2. Multi-domain Objective Functions
2.1.3. Multi-domain Metrics
2.2. Parent PCE Capability Advertisement
2.3. PCE Domain Identification
2.4. Domain Diversity
3. PCEP Extensions
3.1. Applicability to PCC-PCE Communications
3.2. OPEN Object
3.2.1. H-PCE-CAPABILITY TLV
3.2.1.1. Backwards Compatibility
3.2.2. Domain-ID TLV
3.3. RP Object
3.3.1. H-PCE-FLAG TLV
3.3.2. Domain-ID TLV
3.4. Objective Functions
3.4.1. OF Codes
3.4.2. OF Object
3.5. METRIC Object
3.6. SVEC Object
3.7. PCEP-ERROR Object
3.7.1. Hierarchical PCE Error-Type
3.8. NO-PATH Object
4. H-PCE Procedures
4.1. OPEN Procedure between Child PCE and Parent PCE
4.2. Procedure for Obtaining the Domain Sequence
5. Error Handling
6. Manageability Considerations
6.1. Control of Function and Policy
6.1.1. Child PCE
6.1.2. Parent PCE
6.1.3. Policy Control
6.2. Information and Data Models
6.3. Liveness Detection and Monitoring
6.4. Verifying Correct Operations
6.5. Requirements on Other Protocols
6.6. Impact on Network Operations
7. IANA Considerations
7.1. PCEP TLV Type Indicators
7.2. H-PCE-CAPABILITY TLV Flags
7.3. Domain-ID TLV Domain Type
7.4. H-PCE-FLAG TLV Flags
7.5. OF Codes
7.6. METRIC Object Types
7.7. New PCEP Error-Types and Values
7.8. New NO-PATH-VECTOR TLV Bit Flag
7.9. SVEC Flag
8. Security Considerations
9. References
9.1. Normative References
9.2. Informative References
Acknowledgements
Contributors
Authors' Addresses
1. Introduction
The Path Computation Element Communication Protocol (PCEP) provides a
mechanism for Path Computation Elements (PCEs) and Path Computation
Clients (PCCs) to exchange requests for path computation and
responses that provide computed paths.
The capability to compute the routes of end-to-end inter-domain MPLS
Traffic Engineering (MPLS-TE) and GMPLS Label Switched Paths (LSPs)
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