BIER-TE Fast ReRoute
draft-chen-bier-te-frr-00

Document Type Active Internet-Draft (individual)
Authors Huaimo Chen  , Mike McBride  , Yisong Liu  , Aijun Wang  , Gyan Mishra  , Yanhe Fan  , Lei Liu  , Xufeng Liu 
Last updated 2021-02-21
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Network Working Group                                            H. Chen
Internet-Draft                                                M. McBride
Intended status: Standards Track                               Futurewei
Expires: August 25, 2021                                          Y. Liu
                                                            China Mobile
                                                                 A. Wang
                                                           China Telecom
                                                               G. Mishra
                                                            Verizon Inc.
                                                                  Y. Fan
                                                            Casa Systems
                                                                  L. Liu
                                                                 Fujitsu
                                                                  X. Liu
                                                          Volta Networks
                                                       February 21, 2021

                          BIER-TE Fast ReRoute
                       draft-chen-bier-te-frr-00

Abstract

   This document describes a mechanism for fast re-route (FRR)
   protection against the failure of a transit node or link on an
   explicit point to multipoint (P2MP) multicast path/tree in a "Bit
   Index Explicit Replication" (BIER) Traffic Engineering (TE) domain.
   It does not have any per-path state in the core.  For a multicast
   packet to traverse a transit node along an explicit P2MP path, when
   the node fails, its upstream hop node as a PLR reroutes the packet
   around the failed node along the P2MP path once it detects the
   failure.

Requirements Language

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",
   "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this
   document are to be interpreted as described in [RFC2119] [RFC8174]
   when, and only when, they appear in all capitals, as shown here.

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
   Task Force (IETF).  Note that other groups may also distribute

Chen, et al.             Expires August 25, 2021                [Page 1]
Internet-Draft                 BIER-TE FRR                 February 2021

   working documents as Internet-Drafts.  The list of current Internet-
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   This Internet-Draft will expire on August 25, 2021.

Copyright Notice

   Copyright (c) 2021 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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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   3
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Overview of BIER-TE FRR . . . . . . . . . . . . . . . . . . .   4
   3.  BIER-TE Extensions for BIER-TE FRR  . . . . . . . . . . . . .   5
     3.1.  Extensions to BIER-TE BIFT  . . . . . . . . . . . . . . .   5
     3.2.  Updated Forwarding Procedure  . . . . . . . . . . . . . .   6
   4.  Example Application of BIER-TE FRR  . . . . . . . . . . . . .   7
     4.1.  Example BIER-TE Topology  . . . . . . . . . . . . . . . .   7
     4.2.  BIER-TE BIFT on a BFR . . . . . . . . . . . . . . . . . .   8
     4.3.  Extended BIER-TE BIFT on a BFR  . . . . . . . . . . . . .  10
     4.4.  Forwarding using Extended BIER-TE BIFT  . . . . . . . . .  13
       4.4.1.  Forwarding in Normal Operations . . . . . . . . . . .  13
       4.4.2.  Forwarding in Failure . . . . . . . . . . . . . . . .  13
   5.  Security Considerations . . . . . . . . . . . . . . . . . . .  14
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  14
   7.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  14
   8.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     8.1.  Normative References  . . . . . . . . . . . . . . . . . .  14
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