mLDP Node Protection
draft-ietf-mpls-mldp-node-protection-01

Network Working Group                                  IJ. Wijnands, Ed.
Internet-Draft                                                  E. Rosen
Intended status: Standards Track                                 K. Raza
Expires: August 17, 2014                             Cisco Systems, Inc.
                                                             J. Tantsura
                                                                Ericsson
                                                                A. Atlas
                                                        Juniper Networks
                                                                 Q. Zhao
                                                       Huawei Technology
                                                       February 13, 2014

                          mLDP Node Protection
                draft-ietf-mpls-mldp-node-protection-01

Abstract

   This document describes procedures to support node protection for
   Point-to-Multipoint and Multipoint-to-Multipoint Label Switched Paths
   (MP LSPs) built by LDP ("Label Distribution Protocol"), or simply
   mLDP.  In order to protect a node N, the Point of Local Repair (PLR)
   LSR of N must learn the Merge Point (MPT) LSR(s) of node N such that
   traffic can be redirected to them in case node N fails.  Redirecting
   the traffic around the failed node N depends on existing P2P LSPs
   originated from the PLR LSR to the MPT LSRs while bypassing LSR node
   N.

Status of this Memo

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Copyright Notice

   Copyright (c) 2014 IETF Trust and the persons identified as the

Wijnands, et al.         Expires August 17, 2014                [Page 1]
Internet-Draft            mLDP Node Protection             February 2014

   document authors.  All rights reserved.

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Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Conventions used in this document  . . . . . . . . . . . .  3
     1.2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  3
   2.  PLR Determination  . . . . . . . . . . . . . . . . . . . . . .  4
     2.1.  Transit node procedure . . . . . . . . . . . . . . . . . .  4
     2.2.  MP2MP root node procedure  . . . . . . . . . . . . . . . .  5
     2.3.  PLR information encoding . . . . . . . . . . . . . . . . .  5
   3.  Using the tLDP session . . . . . . . . . . . . . . . . . . . .  7
   4.  Link or node failure . . . . . . . . . . . . . . . . . . . . .  9
     4.1.  Re-convergence after node/link failure . . . . . . . . . . 10
       4.1.1.  Node failure . . . . . . . . . . . . . . . . . . . . . 10
       4.1.2.  Link failure . . . . . . . . . . . . . . . . . . . . . 10
       4.1.3.  Switching to new primary path  . . . . . . . . . . . . 11
   5.  mLDP Capabilities for Node Protection  . . . . . . . . . . . . 11
     5.1.  PLR capability . . . . . . . . . . . . . . . . . . . . . . 12
     5.2.  MPT capability . . . . . . . . . . . . . . . . . . . . . . 12
     5.3.  The Protected LSR  . . . . . . . . . . . . . . . . . . . . 12
     5.4.  The Node Protection Capability . . . . . . . . . . . . . . 13
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 14
   7.  IANA considerations  . . . . . . . . . . . . . . . . . . . . . 14
   8.  Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . 14
   9.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 14
     9.1.  Normative References . . . . . . . . . . . . . . . . . . . 14
     9.2.  Informative References . . . . . . . . . . . . . . . . . . 15