LDP Extensions for RMR
draft-esale-mpls-ldp-rmr-extensions-02

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INTERNET-DRAFT                                             Santosh Esale
Intended Status: Proposed Standard                      Kireeti Kompella
Expires: November 21, 2018                              Juniper Networks
                                                            May 20, 2018

                        LDP Extensions for RMR  
                 draft-esale-mpls-ldp-rmr-extensions-02

Abstract

   This document describes LDP extensions to signal Resilient MPLS Ring
   (RMR) Label Switched Paths (LSPs).  An RMR LSP is a multipoint to
   point LSP signaled using LDP (Label Distribution Protocol). RMR
   Architecture document - draft-ietf-mpls-rmr-02 - describes why and
   how MPLS should be used in ring topologies.

Status of this Memo

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Copyright and License Notice

   Copyright (c) 2018 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
   Provisions Relating to IETF Documents
 

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   (http://trustee.ietf.org/license-info) in effect on the date of
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Table of Contents

   1  Introduction  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . . . .  3
   3.  Protocol extensions  . . . . . . . . . . . . . . . . . . . . .  4
     3.1.  Ring LSP Capability  . . . . . . . . . . . . . . . . . . .  4
     3.2.  Ring FEC Element . . . . . . . . . . . . . . . . . . . . .  4
   4.  Ring Procedures  . . . . . . . . . . . . . . . . . . . . . . .  6
     4.1 Upstream LSR . . . . . . . . . . . . . . . . . . . . . . . .  6
     4.2  Ring Label Mapping Procedures . . . . . . . . . . . . . . .  7
       4.2.1  Definitions . . . . . . . . . . . . . . . . . . . . . .  7
       4.2.2  Preliminary . . . . . . . . . . . . . . . . . . . . . .  7
       4.2.3  Egress LSR  . . . . . . . . . . . . . . . . . . . . . .  7
       4.2.4  Ingress and Transit LSR . . . . . . . . . . . . . . . .  8
     4.3 Equal Cost Multipath (ECMP)  . . . . . . . . . . . . . . . .  8
     4.4 Protection . . . . . . . . . . . . . . . . . . . . . . . . .  8
   5.  LSP Hierarchy  . . . . . . . . . . . . . . . . . . . . . . . .  9
   6.  Ring LSPs  . . . . . . . . . . . . . . . . . . . . . . . . . .  9
   7.  Security Considerations  . . . . . . . . . . . . . . . . . . . 11
   8. IANA Considerations . . . . . . . . . . . . . . . . . . . . . . 11
   9. Acknowledgments . . . . . . . . . . . . . . . . . . . . . . . . 11
   10.  Contributors  . . . . . . . . . . . . . . . . . . . . . . . . 11
   11.  References  . . . . . . . . . . . . . . . . . . . . . . . . . 12
     11.1  Normative References . . . . . . . . . . . . . . . . . . . 12
     11.2  Informative References . . . . . . . . . . . . . . . . . . 12
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 13

 

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1  Introduction

   This document describes LDP extensions to signal resilient MPLS ring
   (RMR) label switched paths (LSPs).  An RMR LSP is a multipoint to
   point LSP signaled using LDP (Label Distribution Protocol).
   Architecture document of RMR - draft-ietf-mpls-rmr-02 - describes why
   and how MPLS should be used in ring topologies.

   The ring is either auto-discovered or configured using IGP protocol
   such as OSPF or ISIS. IGP extensions for RMR is described in a
   companion documents. After the ring discovery, each ring node acting