LDP Extensions for RMR
draft-esale-ldp-rmr-extensions-00

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INTERNET-DRAFT                                             Santosh Esale
Intended Status: Proposed Standard                      Kireeti Kompella
Expires: May 4, 2017                                    Juniper Networks
                                                        October 31, 2016

                        LDP Extensions for RMR  
                   draft-esale-ldp-rmr-extensions-00

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.

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Copyright and License Notice

   Copyright (c) 2016 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
   publication of this document. Please review these documents
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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 . . . . . . . . . . . . . . . . . . . . . . . . .  9
   5.  LSP Hierarchy  . . . . . . . . . . . . . . . . . . . . . . . .  9
   6.  Ring LSPs  . . . . . . . . . . . . . . . . . . . . . . . . . . 10
   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 will be described in a
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