Multipoint LDP (mLDP) Node Protection
RFC 7715

Document Type RFC - Proposed Standard (January 2016; No errata)
Last updated 2016-01-08
Replaces draft-wijnands-mpls-mldp-node-protection
Stream IETF
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Stream WG state Submitted to IESG for Publication
Document shepherd Loa Andersson
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IESG IESG state RFC 7715 (Proposed Standard)
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Internet Engineering Task Force (IETF)                 IJ. Wijnands, Ed.
Request for Comments: 7715                                       K. Raza
Category: Standards Track                            Cisco Systems, Inc.
ISSN: 2070-1721                                                 A. Atlas
                                                  Juniper Networks, Inc.
                                                             J. Tantsura
                                                                Ericsson
                                                                 Q. Zhao
                                                       Huawei Technology
                                                            January 2016

                 Multipoint LDP (mLDP) Node Protection

Abstract

   This document describes procedures to support node protection for
   Point-to-Multipoint and Multipoint-to-Multipoint Label Switched Paths
   (P2MP and MP2MP LSPs) that have been built by the Multipoint Label
   Distribution Protocol (mLDP).  In order to protect a node N, the
   Point of Local Repair (PLR) Label Switching Router (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 Point-to-Point (P2P)
   Label Switched Paths (LSPs).  The pre-established LSPs originate from
   the PLR LSR and terminate on the MPT LSRs while bypassing LSR N.

Status of This Memo

   This is an Internet Standards Track document.

   This document is a product of the Internet Engineering Task Force
   (IETF).  It represents the consensus of the IETF community.  It has
   received public review and has been approved for publication by the
   Internet Engineering Steering Group (IESG).  Further information on
   Internet Standards is available in Section 2 of RFC 5741.

   Information about the current status of this document, any errata,
   and how to provide feedback on it may be obtained at
   http://www.rfc-editor.org/info/rfc7715.

Wijnands, et al.             Standards Track                    [Page 1]
RFC 7715                  mLDP Node Protection              January 2016

Copyright 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
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must
   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction . . . . . . . . . . . . . . . . . . . . . . . . .  3
     1.1.  Conventions Used in This Document  . . . . . . . . . . . .  3
     1.2.  Terminology  . . . . . . . . . . . . . . . . . . . . . . .  4
   2.  PLR Determination  . . . . . . . . . . . . . . . . . . . . . .  4
     2.1.  Transit Node Procedure . . . . . . . . . . . . . . . . . .  5
     2.2.  MP2MP Root Node Procedure  . . . . . . . . . . . . . . . .  6
     2.3.  PLR Information Encoding . . . . . . . . . . . . . . . . .  7
   3.  Using the tLDP Session . . . . . . . . . . . . . . . . . . . .  9
   4.  Link or Node Failure . . . . . . . . . . . . . . . . . . . . . 10
     4.1.  Reconvergence after Node or Link Failure . . . . . . . . . 11
       4.1.1.  Node Failure . . . . . . . . . . . . . . . . . . . . . 12
       4.1.2.  Link Failure . . . . . . . . . . . . . . . . . . . . . 12
       4.1.3.  Switching to New Primary Path  . . . . . . . . . . . . 12
   5.  mLDP Capabilities for Node Protection  . . . . . . . . . . . . 13
     5.1.  PLR Capability . . . . . . . . . . . . . . . . . . . . . . 13
     5.2.  MPT Capability . . . . . . . . . . . . . . . . . . . . . . 14
     5.3.  The Protected LSR  . . . . . . . . . . . . . . . . . . . . 14
     5.4.  The Node Protection Capability . . . . . . . . . . . . . . 15
   6.  Security Considerations  . . . . . . . . . . . . . . . . . . . 16
   7.  IANA Considerations  . . . . . . . . . . . . . . . . . . . . . 16
   8.  References . . . . . . . . . . . . . . . . . . . . . . . . . . 17
     8.1.  Normative References . . . . . . . . . . . . . . . . . . . 17
     8.2.  Informative References . . . . . . . . . . . . . . . . . . 17
   Acknowledgments  . . . . . . . . . . . . . . . . . . . . . . . . . 18
   Contributors . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
   Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 19
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