Stateful Path Computation Element (PCE) Protocol Extensions for Usage with Point-to-Multipoint TE Label Switched Paths (LSPs)
RFC 8623
Internet Engineering Task Force (IETF) U. Palle
Request for Comments: 8623 D. Dhody
Category: Standards Track Huawei Technologies
ISSN: 2070-1721 Y. Tanaka
NTT Communications
V. Beeram
Juniper Networks
June 2019
Stateful Path Computation Element (PCE) Protocol Extensions
for Usage with Point-to-Multipoint TE Label Switched Paths (LSPs)
Abstract
The Path Computation Element (PCE) has been identified as an
appropriate technology for the determination of the paths of point-
to-multipoint (P2MP) TE Label Switched Paths (LSPs). This document
provides extensions required for the Path Computation Element
Communication Protocol (PCEP) so as to enable the usage of a stateful
PCE capability in supporting P2MP TE LSPs.
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/rfc8623.
Palle, et al. Standards Track [Page 1]
RFC 8623 Stateful P2MP June 2019
Copyright Notice
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Requirements Language . . . . . . . . . . . . . . . . . . 4
2. Terminology . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Supporting P2MP TE LSPs for Stateful PCE . . . . . . . . . . 4
3.1. Motivation . . . . . . . . . . . . . . . . . . . . . . . 4
3.2. Objectives . . . . . . . . . . . . . . . . . . . . . . . 5
4. Functions to Support P2MP TE LSPs for Stateful PCEs . . . . . 5
5. Architectural Overview of Protocol Extensions . . . . . . . . 6
5.1. Extension of PCEP Messages . . . . . . . . . . . . . . . 6
5.2. Capability Advertisement . . . . . . . . . . . . . . . . 7
5.3. IGP Extensions for Stateful PCE P2MP Capabilities
Advertisement . . . . . . . . . . . . . . . . . . . . . . 7
5.4. State Synchronization . . . . . . . . . . . . . . . . . . 8
5.5. LSP Delegation . . . . . . . . . . . . . . . . . . . . . 8
5.6. LSP Operations . . . . . . . . . . . . . . . . . . . . . 9
5.6.1. Passive Stateful PCE . . . . . . . . . . . . . . . . 9
5.6.2. Active Stateful PCE . . . . . . . . . . . . . . . . . 9
5.6.3. PCE-Initiated LSP . . . . . . . . . . . . . . . . . . 9
5.6.3.1. P2MP TE LSPs Instantiation . . . . . . . . . . . 9
5.6.3.2. P2MP TE LSPs Deletion . . . . . . . . . . . . . . 10
5.6.3.3. Adding and Pruning Leaves for the P2MP TE LSP . . 10
5.6.3.4. P2MP TE LSPs Delegation and Cleanup . . . . . . . 10
6. PCEP Message Extensions . . . . . . . . . . . . . . . . . . . 11
6.1. The PCRpt Message . . . . . . . . . . . . . . . . . . . . 11
6.2. The PCUpd Message . . . . . . . . . . . . . . . . . . . . 13
6.3. The PCReq Message . . . . . . . . . . . . . . . . . . . . 14
6.4. The PCRep Message . . . . . . . . . . . . . . . . . . . . 15
6.5. The PCInitiate Message . . . . . . . . . . . . . . . . . 16
6.6. Example . . . . . . . . . . . . . . . . . . . . . . . . . 17
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RFC 8623 Stateful P2MP June 2019
6.6.1. P2MP TE LSPs Update Request . . . . . . . . . . . . . 17
6.6.2. P2MP TE LSP Report . . . . . . . . . . . . . . . . . 17
6.6.3. P2MP TE LSPs Initiation Request . . . . . . . . . . . 18
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