Resilient MPLS Rings using SPRING
draft-kompella-spring-rmr-02

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Last updated 2020-03-09
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SPRING Working Group                                         K. Kompella
Internet-Draft                                                   T. Saad
Intended status: Standards Track                             A. Deshmukh
Expires: September 9, 2020                              Juniper Networks
                                                          March 08, 2020

                   Resilient MPLS Rings using SPRING
                      draft-kompella-spring-rmr-02

Abstract

   This document describes the use of SPRING to setup LSP(s) for
   resilient MPLS ring networks.  It specifies how clockwise and anti-
   clockwise ring SIDs are allocated and signaled using IGP protocol
   extensions, and how such ring SIDs achieve ring protection.

Status of This Memo

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Kompella, et al.        Expires September 9, 2020               [Page 1]
Internet-Draft              SPRING RMR Rings                  March 2020

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Ring Terminology  . . . . . . . . . . . . . . . . . . . .   3
   3.  Protocol extensions . . . . . . . . . . . . . . . . . . . . .   4
   4.  Ring SPRING LSPs  . . . . . . . . . . . . . . . . . . . . . .   5
     4.1.  Ring SID Assignment . . . . . . . . . . . . . . . . . . .   5
       4.1.1.  Ring SID Assignment Using DHCP  . . . . . . . . . . .   5
     4.2.  Ring SPRING LSP Set Up  . . . . . . . . . . . . . . . . .   5
     4.3.  Protection and Fastreroute  . . . . . . . . . . . . . . .   6
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   6
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .   6
   7.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .   6
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   6
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .   7
     8.2.  Informative References  . . . . . . . . . . . . . . . . .   7
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   8

1.  Introduction

   Ring topologies are very common in transport networks, and are
   ubiquitous in access and aggregation networks.

   This draft introduces extensions to IGP protocols to establish SPRING
   Label Switched Paths (LSPs) for Resilient MPLS Rings (RMR).  An RMR
   LSP is a multipoint to point (MP2P) LSP with simple protection.

   SPRING [RFC8402] defines the notion of node SIDs which guide packets
   along the IGP shortest path to the advertising node.  Node SIDs are
   typically advertised by an IGP.  This draft uses a similar notion to
   guide packets along a "clockwise" (CW) or "anti-clockwise" (AC) path
   to the advertising node.  The concept of CW and AC are well-defined
   in RMR rings.

   Rings are auto-discovered using the mechanisms described in the
   [I-D.ietf-mpls-rmr].  Signaling extensions for IS-IS and OSPF are
   introduced in [I-D.kompella-isis-ospf-rmr] to enable the auto-
   discovery of ring topologies.  After the ring topology is discovered,
   each node in the ring determines its CW and AC ring neighbors and
   associated ring links.

   [I-D.ietf-teas-rsvp-rmr-extension] describes RSVP-TE [RFC3209]
   extensions to set up Resilient MPLS Ring (RMR) LSPs.
   [I-D.ietf-mpls-ldp-rmr-extensions] describes LDP [RFC5036] extensions
   to set up LDP RMR LSPs.  This document does the same for SPRING RMR
   LSPs and the associated protection LSPs.

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