Resilient MPLS Rings
draft-ietf-mpls-rmr-12

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MPLS WG                                                      K. Kompella
Internet-Draft                                    Juniper Networks, Inc.
Intended status: Standards Track                            L. Contreras
Expires: April 25, 2020                                       Telefonica
                                                        October 23, 2019

                          Resilient MPLS Rings
                         draft-ietf-mpls-rmr-12

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, 2020.

Copyright Notice

   Copyright (c) 2019 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

Kompella & Contreras     Expires April 25, 2020                 [Page 1]
Internet-Draft            Resilient MPLS Rings              October 2019

   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.  Protection  . . . . . . . . . . . . . . . . . . . . . . .   7
     3.7.  Installing FRR LFIB Entries . . . . . . . . . . . . . . .   8
   4.  Autodiscovery . . . . . . . . . . . . . . . . . . . . . . . .   9
     4.1.  Overview  . . . . . . . . . . . . . . . . . . . . . . . .   9
     4.2.  Ring Announcement Phase . . . . . . . . . . . . . . . . .  10
     4.3.  Mastership Phase  . . . . . . . . . . . . . . . . . . . .  11
     4.4.  Ring Identification Phase . . . . . . . . . . . . . . . .  11
     4.5.  Ring Changes  . . . . . . . . . . . . . . . . . . . . . .  12
   5.  Ring OAM  . . . . . . . . . . . . . . . . . . . . . . . . . .  13
   6.  Advanced Topics . . . . . . . . . . . . . . . . . . . . . . .  13
     6.1.  Half-rings  . . . . . . . . . . . . . . . . . . . . . . .  13
     6.2.  Hub Node Resilience . . . . . . . . . . . . . . . . . . .  13
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   8.  Acknowledgments . . . . . . . . . . . . . . . . . . . . . . .  14
   9.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
   10. References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     10.1.  Normative References . . . . . . . . . . . . . . . . . .  14
     10.2.  Informative References . . . . . . . . . . . . . . . . .  14
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Introduction

   Rings are a very common topology in transport networks.  A ring is
   the simplest topology offering link and node resilience.  Rings are