PCEP Extension for Stateful Inter-Domain Tunnels
draft-ietf-pce-stateful-interdomain-01
Path Computation Element Working Group O. Dugeon
Internet-Draft J. Meuric
Intended status: Standards Track Orange Labs
Expires: August 26, 2021 Y. Lee
Samsung Electronics
D. Ceccarelli
Ericsson
February 22, 2021
PCEP Extension for Stateful Inter-Domain Tunnels
draft-ietf-pce-stateful-interdomain-01
Abstract
This document specifies how to use a Backward Recursive or
Hierarchical method to derive inter-domain paths in the context of
stateful Path Computation Element (PCE). The mechanism relies on the
PCInitiate message to set up independent paths per domain. Combining
these different paths together enables them to be operated as end-to-
end inter-domain paths, without the need for a signaling session
between inter-domain border routers. For this purpose, this document
defines a new Stitching Label, new Path Setup Types, new Association
Type, and a new PCEP communication Protocol (PCEP) Capability.
Status of This Memo
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This Internet-Draft will expire on August 26, 2021.
Copyright Notice
Copyright (c) 2021 IETF Trust and the persons identified as the
document authors. All rights reserved.
Dugeon, et al. Expires August 26, 2021 [Page 1]
Internet-Draft PCE Stateful Inter-Domain Tunnels February 2021
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. General Assumptions . . . . . . . . . . . . . . . . . . . 4
1.2. Terminology . . . . . . . . . . . . . . . . . . . . . . . 6
2. Stitching Label . . . . . . . . . . . . . . . . . . . . . . . 7
2.1. Definition . . . . . . . . . . . . . . . . . . . . . . . 7
2.2. Inter-domain LSP-TYPE . . . . . . . . . . . . . . . . . . 8
3. Backward Recursive PCInitiate Procedure . . . . . . . . . . . 9
3.1. Mode of Operation . . . . . . . . . . . . . . . . . . . . 9
3.2. Example . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.3. Completion Failure of Inter-domain Path Setup Procedure . 13
4. Hierarchical PCInitiate Procedure . . . . . . . . . . . . . . 14
4.1. Mode of Operation . . . . . . . . . . . . . . . . . . . . 14
4.2. Completion Failure of Inter-domain Path Setup Procedure . 16
4.3. Example for Stateful H-PCE Stiching Procedure . . . . . . 17
5. Inter-domain Path Management . . . . . . . . . . . . . . . . 21
5.1. Stitching Label PCE Capabilities . . . . . . . . . . . . 21
5.2. Identification of Inter-domain Paths . . . . . . . . . . 22
5.3. Inter-domain Association Group . . . . . . . . . . . . . 23
5.4. Modification of Inter-domain Paths . . . . . . . . . . . 24
5.5. Modification of Inter-domain Paths . . . . . . . . . . . 25
5.6. Tear-Down of Inter-domain Paths . . . . . . . . . . . . . 25
6. Applicability . . . . . . . . . . . . . . . . . . . . . . . . 25
6.1. RSVP-TE . . . . . . . . . . . . . . . . . . . . . . . . . 25
6.2. Segment Routing . . . . . . . . . . . . . . . . . . . . . 26
6.3. Mixing Technologies . . . . . . . . . . . . . . . . . . . 27
6.4. Inter-Area . . . . . . . . . . . . . . . . . . . . . . . 27
7. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 28
7.1. Path Setup Type Values . . . . . . . . . . . . . . . . . 28
7.2. Association Type Value . . . . . . . . . . . . . . . . . 28
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