Resilient MPLS Rings
draft-kompella-mpls-rmr-00

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Last updated 2014-10-26
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MPLS WG                                                      K. Kompella
Internet-Draft                                    Juniper Networks, Inc.
Intended status: Standards Track                        October 26, 2014
Expires: April 29, 2015

                          Resilient MPLS Rings
                       draft-kompella-mpls-rmr-00

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
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   This Internet-Draft will expire on April 29, 2015.

Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the
   document authors.  All rights reserved.

   This document is subject to BCP 78 and the IETF Trust's Legal

Kompella                 Expires April 29, 2015                 [Page 1]
Internet-Draft            Resilient MPLS Rings              October 2014

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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . . 3
     1.1.  Definitions . . . . . . . . . . . . . . . . . . . . . . . . 3
   2.  Motivation  . . . . . . . . . . . . . . . . . . . . . . . . . . 4
   3.  Theory of Operation . . . . . . . . . . . . . . . . . . . . . . 4
     3.1.  Configuration . . . . . . . . . . . . . . . . . . . . . . . 4
     3.2.  Auto-discovery  . . . . . . . . . . . . . . . . . . . . . . 5
     3.3.  Signaling . . . . . . . . . . . . . . . . . . . . . . . . . 5
     3.4.  Installing Primary LFIB Entries . . . . . . . . . . . . . . 5
     3.5.  Installing FRR LFIB Entries . . . . . . . . . . . . . . . . 5
     3.6.  Protection  . . . . . . . . . . . . . . . . . . . . . . . . 5
   4.  Security Considerations . . . . . . . . . . . . . . . . . . . . 6
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 6
   6.  References  . . . . . . . . . . . . . . . . . . . . . . . . . . 6
     6.1.  Normative References  . . . . . . . . . . . . . . . . . . . 6
     6.2.  Informative References  . . . . . . . . . . . . . . . . . . 6
   Author's Address  . . . . . . . . . . . . . . . . . . . . . . . . . 6

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1.  Introduction

   Rings are a very common topology in transport networks.  A ring is
   the simplest topology offering link and node resilience.  Rings are
   nearly ubiquitous in access and aggregation networks.  As MPLS
   increases its presence in such networks, and takes on a greater role
   in transport, it is imperative that MPLS handles rings well; this is
   not the case today.

   This document describes the special nature of rings, and the special
   needs of MPLS on rings.  It then shows how these needs can be met in
   several ways, some of which involve extensions to protocols such as
   IS-IS [RFC1195], OSPF[RFC2328], RSVP-TE [RFC3209] and LDP [RFC5036].

1.1.  Definitions

   A (directed) graph G = (V, E) consists of a set of vertices (or
   nodes) V and a set of edges (or links) E. An edge is an ordered pair
   of nodes (a, b), where a and b are in V. (In this document, the terms
   node and link will be used instead of vertex and edge.)

   A ring is a subgraph of G. A ring consists of a subset of nodes {R_i,
   1 <= i <= n} of V. For convenience, we define R_0 = R_n.  The edges
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