LDP Extensions to Support Maximally Redundant Trees
draft-ietf-mpls-ldp-mrt-06

Document Type Active Internet-Draft (mpls WG)
Last updated 2017-09-14 (latest revision 2017-08-17)
Replaces draft-atlas-mpls-ldp-mrt
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MPLS Working Group                                              A. Atlas
Internet-Draft                                           K. Tiruveedhula
Intended status: Standards Track                               C. Bowers
Expires: February 18, 2018                              Juniper Networks
                                                             J. Tantsura
                                                              Individual
                                                            IJ. Wijnands
                                                     Cisco Systems, Inc.
                                                         August 17, 2017

          LDP Extensions to Support Maximally Redundant Trees
                       draft-ietf-mpls-ldp-mrt-06

Abstract

   This document specifies extensions to the Label Distribution
   Protocol(LDP) to support the creation of label-switched paths for
   Maximally Redundant Trees (MRT).  A prime use of MRTs is for unicast
   and multicast IP/LDP Fast-Reroute, which we will refer to as MRT-FRR.

   The sole protocol extension to LDP is simply the ability to advertise
   an MRT Capability.  This document describes that extension and the
   associated behavior expected for LSRs (Label Switching Routers) and
   LERs (Label Edge Routers) advertising the MRT Capability.

   MRT-FRR uses LDP multi-topology extensions and requires three
   different multi-topology IDs to be allocated from the MPLS MT-ID
   space.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
   provisions of BCP 78 and BCP 79.

   Internet-Drafts are working documents of the Internet Engineering
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   This Internet-Draft will expire on February 18, 2018.

Atlas, et al.           Expires February 18, 2018               [Page 1]
Internet-Draft        LDP Extensions to Support MRT          August 2017

Copyright Notice

   Copyright (c) 2017 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
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   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Requirements Language . . . . . . . . . . . . . . . . . . . .   4
   3.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   4
   4.  Overview of LDP Signaling Extensions for MRT  . . . . . . . .   5
     4.1.  MRT Capability Advertisement  . . . . . . . . . . . . . .   5
       4.1.1.  Interaction of MRT Capability and MT Capability . . .   6
       4.1.2.  Interaction of LDP MRT Capability with IPv4 and IPv6    6
     4.2.  Use of the Rainbow MRT MT-ID  . . . . . . . . . . . . . .   7
     4.3.  MRT-Blue and MRT-Red FECs . . . . . . . . . . . . . . . .   7
     4.4.  Interaction of MRT-related LDP advertisements with the
           MRT topology and computations . . . . . . . . . . . . . .   8
   5.  LDP MRT FEC Advertisements  . . . . . . . . . . . . . . . . .   8
     5.1.  MRT-specific behavior . . . . . . . . . . . . . . . . . .   9
       5.1.1.  ABR behavior and use of the Rainbow FEC . . . . . . .   9
       5.1.2.  Proxy-node attachment router behavior . . . . . . . .  10
     5.2.  LDP protocol procedures in the context of MRT label
           distribution  . . . . . . . . . . . . . . . . . . . . . .  11
       5.2.1.  LDP peer in RFC5036 . . . . . . . . . . . . . . . . .  11
       5.2.2.  Next hop in RFC5036 . . . . . . . . . . . . . . . . .  11
       5.2.3.  Egress LSR in RFC5036 . . . . . . . . . . . . . . . .  12
       5.2.4.  Use of Rainbow FEC to satisfy label mapping existence
               requirements in RFC5036 . . . . . . . . . . . . . . .  13
       5.2.5.  Validating FECs in routing table  . . . . . . . . . .  14
       5.2.6.  Recognizing new FECs  . . . . . . . . . . . . . . . .  14
       5.2.7.  Not propagating Rainbow FEC label mappings  . . . . .  14
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