PCEP Extensions for Associated Bidirectional Label Switched Paths (LSPs)
draft-ietf-pce-association-bidir-08
PCE Working Group R. Gandhi, Ed.
Internet-Draft Cisco Systems, Inc.
Intended status: Standards Track C. Barth
Expires: March 19, 2021 Juniper Networks
B. Wen
Comcast
September 15, 2020
PCEP Extensions for Associated Bidirectional Label Switched Paths (LSPs)
draft-ietf-pce-association-bidir-08
Abstract
The Path Computation Element Communication Protocol (PCEP) provides
mechanisms for Path Computation Elements (PCEs) to perform path
computations in response to Path Computation Clients (PCCs) requests.
The Stateful PCE extensions allow stateful control of Multiprotocol
Label Switching (MPLS) Traffic Engineering (TE) Label Switched Paths
(LSPs) using PCEP.
This document defines PCEP extensions for grouping two unidirectional
MPLS TE LSPs (one in each direction in the network) into an
Associated Bidirectional LSP. The mechanisms defined in this
document can be applied using a Stateful PCE for both PCE-Initiated
and PCC-Initiated LSPs, as well as when using a Stateless PCE. The
procedures defined are applicable to the LSPs using Resource
Reservation Protocol (RSVP) for signaling.
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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material or to cite them other than as "work in progress."
This Internet-Draft will expire on March 19, 2021.
Gandhi, et al. Expires March 19, 2021 [Page 1]
Internet-Draft PCEP for Associated Bidirectional LSP September 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Summary of PCEP Extensions . . . . . . . . . . . . . . . 4
2. Conventions Used in This Document . . . . . . . . . . . . . . 4
2.1. Key Word Definitions . . . . . . . . . . . . . . . . . . 4
2.2. Terminology . . . . . . . . . . . . . . . . . . . . . . . 5
3. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1. Single-sided Initiation . . . . . . . . . . . . . . . . . 5
3.2. Double-sided Initiation . . . . . . . . . . . . . . . . . 7
3.3. Co-routed Associated Bidirectional LSP . . . . . . . . . 8
4. Protocol Extensions . . . . . . . . . . . . . . . . . . . . . 8
4.1. ASSOCIATION Object . . . . . . . . . . . . . . . . . . . 8
4.2. Bidirectional LSP Association Group TLV . . . . . . . . . 9
5. PCEP Procedure . . . . . . . . . . . . . . . . . . . . . . . 10
5.1. PCE Initiated LSPs . . . . . . . . . . . . . . . . . . . 11
5.2. PCC Initiated LSPs . . . . . . . . . . . . . . . . . . . 11
5.3. Stateless PCE . . . . . . . . . . . . . . . . . . . . . . 12
5.4. Bidirectional (B) Flag . . . . . . . . . . . . . . . . . 12
5.5. PLSP-ID Usage . . . . . . . . . . . . . . . . . . . . . . 12
5.6. State Synchronization . . . . . . . . . . . . . . . . . . 13
5.7. Error Handling . . . . . . . . . . . . . . . . . . . . . 13
6. Implementation Status . . . . . . . . . . . . . . . . . . . . 13
6.1. Implementation . . . . . . . . . . . . . . . . . . . . . 14
7. Security Considerations . . . . . . . . . . . . . . . . . . . 14
8. Manageability Considerations . . . . . . . . . . . . . . . . 14
8.1. Control of Function and Policy . . . . . . . . . . . . . 14
8.2. Information and Data Models . . . . . . . . . . . . . . . 14
8.3. Liveness Detection and Monitoring . . . . . . . . . . . . 15
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