Resilient MPLS Rings using Segment Routing
draft-kompella-spring-rmr-01

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SPRING Working Group                                         K. Kompella
Internet-Draft                                                   T. Saad
Intended status: Standards Track                             A. Deshmukh
Expires: January 8, 2020                                Juniper Networks
                                                           July 07, 2019

               Resilient MPLS Rings using Segment Routing
                      draft-kompella-spring-rmr-01

Abstract

   This document describes the use of Segment Routing (SR) control plane
   to setup LSP(s) for resilient MPLS ring networks.  It specifies how
   clockwise and anti-clockwise ring LSP(s) are signaled using SR IGP
   protocol extensions, and how such ring LSP(s) are combined to achieve
   ring protection.

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Kompella, et al.         Expires January 8, 2020                [Page 1]
Internet-Draft                SR RMR Rings                     July 2019

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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
     2.1.  Ring Taxonomy . . . . . . . . . . . . . . . . . . . . . .   3
   3.  Protocol extensions . . . . . . . . . . . . . . . . . . . . .   4
     3.1.  SR Ring Capability  . . . . . . . . . . . . . . . . . . .   4
       3.1.1.  IS-IS SR RMR Ring Capabilities Sub-TLV  . . . . . . .   5
       3.1.2.  OSPF SR RMR Ring Capabilities Sub-TLV . . . . . . . .   5
     3.2.  SR Ring Prefix Segment Identifier (Ring-SID)  . . . . . .   5
     3.3.  Ring Segment Identifier (Ring-SID)  . . . . . . . . . . .   8
     3.4.  Ring-SID Propagation  . . . . . . . . . . . . . . . . . .   8
   4.  Ring SR Signaling Procedures  . . . . . . . . . . . . . . . .   8
     4.1.  Ring SID Assignment . . . . . . . . . . . . . . . . . . .   8
       4.1.1.  Static Ring-SID Assignment  . . . . . . . . . . . . .   9
       4.1.2.  Ring-SID Assignment Using SRMS  . . . . . . . . . . .   9
       4.1.3.  Ring-SID Assignment Using DHCP  . . . . . . . . . . .  10
     4.2.  Ring SID LSP Setup  . . . . . . . . . . . . . . . . . . .  10
       4.2.1.  Egress Ring Node  . . . . . . . . . . . . . . . . . .  10
       4.2.2.  Ingress and Transit Ring Nodes  . . . . . . . . . . .  11
       4.2.3.  Protection and Fastreroute  . . . . . . . . . . . . .  11
   5.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  12
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  12
   7.  Acknowledgement . . . . . . . . . . . . . . . . . . . . . . .  12
   8.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . .  12
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  12
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  12
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  14
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  15

1.  Introduction

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

   This draft introduces the necessary extensions to Segment Routing
   (SR) IGP signaling protocol(s) that are needed to establish Label
   Switched Paths (LSPs) for Resilient MPLS Rings (RMR).  An RMR LSP is
   a multipoint to point (MP2P) LSP that is signaled using SR control
   plane extensions to IGPs (e.g.  IS-IS or OSPF).

   SR as defined in [RFC8402] allows for a flexible definition of end-
   to-end paths within IGP topologies by encoding the SR path as a
   sequence of one or more topological sub-paths, or "segments".  Such
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