Resilient MPLS Rings
draft-ietf-mpls-rmr-08
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2018-10-22
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draft-kompella-mpls-rmr
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IETF
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Loa Andersson
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"Loa Andersson" <loa@pi.nu>
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MPLS WG K. Kompella
Internet-Draft Juniper Networks, Inc.
Intended status: Standards Track L. Contreras
Expires: April 25, 2019 Telefonica
October 22, 2018
Resilient MPLS Rings
draft-ietf-mpls-rmr-08
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].
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
Task Force (IETF). Note that other groups may also distribute
working documents as Internet-Drafts. The list of current Internet-
Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months
and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress."
This Internet-Draft will expire on April 25, 2019.
Copyright Notice
Copyright (c) 2018 IETF Trust and the persons identified as the
document authors. All rights reserved.
Kompella & Contreras Expires April 25, 2019 [Page 1]
Internet-Draft Resilient MPLS Rings October 2018
This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents
(https://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents
carefully, as they describe your rights and restrictions with respect
to this document. Code Components extracted from this document must
include Simplified BSD License text as described in Section 4.e of
the Trust Legal Provisions and are provided without warranty as
described in the Simplified BSD License.
Table of Contents
1. Introduction . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1. Definitions . . . . . . . . . . . . . . . . . . . . . . . 3
2. Motivation . . . . . . . . . . . . . . . . . . . . . . . . . 5
3. Theory of Operation . . . . . . . . . . . . . . . . . . . . . 5
3.1. Provisioning . . . . . . . . . . . . . . . . . . . . . . 5
3.2. Ring Nodes . . . . . . . . . . . . . . . . . . . . . . . 6
3.3. Ring Links and Directions . . . . . . . . . . . . . . . . 6
3.3.1. Express Links . . . . . . . . . . . . . . . . . . . . 6
3.4. Ring LSPs . . . . . . . . . . . . . . . . . . . . . . . . 7
3.5. Installing Primary LFIB Entries . . . . . . . . . . . . . 7
3.6. Installing FRR LFIB Entries . . . . . . . . . . . . . . . 7
3.7. Protection . . . . . . . . . . . . . . . . . . . . . . . 8
4. Autodiscovery . . . . . . . . . . . . . . . . . . . . . . . . 9
4.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . 9
4.2. Ring Announcement Phase . . . . . . . . . . . . . . . . . 10
4.3. Mastership Phase . . . . . . . . . . . . . . . . . . . . 10
4.4. Ring Identification Phase . . . . . . . . . . . . . . . . 11
4.5. Ring Changes . . . . . . . . . . . . . . . . . . . . . . 11
5. Ring Signaling . . . . . . . . . . . . . . . . . . . . . . . 12
6. Ring OAM . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7. Advanced Topics . . . . . . . . . . . . . . . . . . . . . . . 12
7.1. Half-rings . . . . . . . . . . . . . . . . . . . . . . . 12
7.2. Hub Node Resilience . . . . . . . . . . . . . . . . . . . 12
8. Security Considerations . . . . . . . . . . . . . . . . . . . 13
9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . 13
10. IANA Considerations . . . . . . . . . . . . . . . . . . . . . 13
11. References . . . . . . . . . . . . . . . . . . . . . . . . . 13
11.1. Normative References . . . . . . . . . . . . . . . . . . 13
11.2. Informative References . . . . . . . . . . . . . . . . . 13
Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . 14
1. Introduction
Rings are a very common topology in transport networks. A ring is
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