Multicast-Only Fast Reroute Based on Topology Independent Loop-free Alternate Fast Reroute
draft-liu-pim-mofrr-tilfa-00

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PIM Working Group                                            Yisong Liu
Internet Draft                                      Huawei Technologies
Intended status: Standards Track                          June 26, 2019
Expires: December 26, 2019

    Multicast-Only Fast Reroute Based on Topology Independent Loop-free
                          Alternate Fast Reroute
                       draft-liu-pim-mofrr-tilfa-00

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Liu, et al.            Expires December, 2019                 [Page 1]
Internet-Draft           MoFRR based on TI-LFA                June 2019

Abstract

   Multicast-only Fast Reroute (MoFRR) has been defined in [RFC7431],
   but the selection of the secondary multicast next hop only according
   to the loop-free alternate fast reroute, which has restrictions in
   multicast deployments. This document describes a mechanism for
   Multicast-only Fast Reroute by using Topology Independent Loop-free
   Alternate fast reroute, which is independent of network topology and
   can achieve covering more network environments.

Table of Contents

   1. Introduction ................................................ 2
      1.1. Requirements Language .................................. 3
      1.2. Terminology ............................................ 3
   2. Problem Statement ........................................... 3
   3. Solution .................................................... 4
      3.1. Secondary UMH Selection in PIM ......................... 5
      3.2. Secondary UMH Selection in MLDP ........................ 5
      3.3. Extension Protocol Fields Conflict ..................... 6
   4. Packet Format ............................................... 6
      4.1. PIM Join Message Extension ............................. 7
      4.2. MLDP Label Mapping Message Extension ................... 8
   5. IANA Considerations ........................................ 11
   6. Security Considerations .................................... 11
   7. References ................................................. 11
      7.1. Normative References .................................. 11
      7.2. Informative References ................................ 12
   8. Acknowledgments ............................................ 12

1. Introduction

   As the deployment of video services, operators are paying more and
   more attention to solutions that minimize the service disruption due
   to faults in the IP network carrying the packets for these services.
   Multicast-only Fast Reroute (MoFRR) has been defined in [RFC7431],
   which can minimize multicast packet loss in a network when node or
   link failures occur by making simple enhancements to multicast
   routing protocols such as Protocol Independent Multicast (PIM) and
   Multipoint LDP (mLDP). But the selection of the secondary multicast
   next hop only according to the loop-free alternate fast reroute in
   [RFC7431], and there are limitations in multicast deployments for
   this mechanism. This document describes a new mechanism for
   Multicast-only Fast Reroute using Topology Independent Loop-free
   Alternate (TILFA) fast reroute, which is independent of network
   topology and can achieve covering more network environments.

Liu, et al.            Expires December, 2019                 [Page 2]
Internet-Draft           MoFRR based on TI-LFA                June 2019
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