Resilient MPLS Rings
draft-ietf-mpls-rmr-13
MPLS WG K. Kompella
Internet-Draft Juniper Networks, Inc.
Intended status: Standards Track L. Contreras
Expires: February 13, 2021 Telefonica
August 12, 2020
Resilient MPLS Rings
draft-ietf-mpls-rmr-13
Abstract
This document describes the use of the MPLS control and data planes
on ring topologies. It describes the special nature of rings, and
proceeds to show how MPLS can be effectively used in such topologies.
It describes how MPLS rings are configured, auto-discovered and
signaled, as well as how the data plane works. Companion documents
describe the details of discovery and signaling for specific
protocols.
Requirements Language
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
document are to be interpreted as described in [RFC2119][RFC8174].
Status of This Memo
This Internet-Draft is submitted in full conformance with the
provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering
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This Internet-Draft will expire on February 13, 2021.
Copyright Notice
Copyright (c) 2020 IETF Trust and the persons identified as the
document authors. All rights reserved.
Kompella & Contreras Expires February 13, 2021 [Page 1]
Internet-Draft Resilient MPLS Rings August 2020
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Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Definitions . . . . . . . . . . . . . . . . . . . . . . . 3
1.2. Changes from -12 in response to reviews . . . . . . . . . 5
2. Motivation . . . . . . . . . . . . . . . . . . . . . . . . . 6
3. Theory of Operation . . . . . . . . . . . . . . . . . . . . . 6
3.1. Provisioning . . . . . . . . . . . . . . . . . . . . . . 7
3.2. Ring Nodes . . . . . . . . . . . . . . . . . . . . . . . 7
3.3. Ring Links and Directions . . . . . . . . . . . . . . . . 8
3.3.1. Express Links . . . . . . . . . . . . . . . . . . . . 9
3.4. Ring LSPs . . . . . . . . . . . . . . . . . . . . . . . . 9
3.5. Installing Primary LFIB Entries . . . . . . . . . . . . . 9
3.6. Protection . . . . . . . . . . . . . . . . . . . . . . . 10
3.7. Installing FRR LFIB Entries . . . . . . . . . . . . . . . 11
4. Autodiscovery . . . . . . . . . . . . . . . . . . . . . . . . 11
4.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . 11
4.2. Ring Announcement Phase . . . . . . . . . . . . . . . . . 13
4.3. Mastership Phase . . . . . . . . . . . . . . . . . . . . 14
4.4. Ring Identification Phase . . . . . . . . . . . . . . . . 14
4.5. Ring Changes . . . . . . . . . . . . . . . . . . . . . . 15
5. Ring OAM . . . . . . . . . . . . . . . . . . . . . . . . . . 16
6. Advanced Topics . . . . . . . . . . . . . . . . . . . . . . . 16
6.1. Beyond the Ring . . . . . . . . . . . . . . . . . . . . . 16
6.2. Half-rings . . . . . . . . . . . . . . . . . . . . . . . 18
6.3. Hub Node Resilience . . . . . . . . . . . . . . . . . . . 18
7. Security Considerations . . . . . . . . . . . . . . . . . . . 18
8. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 19
9. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 19
10. References . . . . . . . . . . . . . . . . . . . . . . . . . 19
10.1. Normative References . . . . . . . . . . . . . . . . . . 19
10.2. Informative References . . . . . . . . . . . . . . . . . 19
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 20
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