BIER Egress Protection
draft-chen-bier-egress-protect-00

Document Type Active Internet-Draft (individual)
Authors Huaimo Chen  , Aijun Wang  , Gyan Mishra  , Yanhe Fan  , Lei Liu  , Xufeng Liu 
Last updated 2020-11-02
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Network Working Group                                            H. Chen
Internet-Draft                                                 Futurewei
Intended status: Standards Track                                 A. Wang
Expires: May 6, 2021                                       China Telecom
                                                               G. Mishra
                                                            Verizon Inc.
                                                                  Y. Fan
                                                            Casa Systems
                                                                  L. Liu
                                                                 Fujitsu
                                                                  X. Liu
                                                          Volta Networks
                                                        November 2, 2020

                         BIER Egress Protection
                   draft-chen-bier-egress-protect-00

Abstract

   This document describes a mechanism for fast protection against the
   failure of an egress node of a "Bit Index Explicit Replication"
   (BIER) domain.  It does not have any per-flow state in the core of
   the domain.  For a multicast packet to an egress node of the domain,
   when the egress node fails, its upstream hop as a PLR sends the
   packet to the egress' backup node once the PLR 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
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   Internet-Drafts are draft documents valid for a maximum of six months
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   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

Chen, et al.               Expires May 6, 2021                  [Page 1]
Internet-Draft             BIER Egress Protect             November 2020

   This Internet-Draft will expire on May 6, 2021.

Copyright Notice

   Copyright (c) 2020 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  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Overview of BIER Egress Protection  . . . . . . . . . . . . .   4
   3.  Protocol Extensions . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  Extensions to OSPF  . . . . . . . . . . . . . . . . . . .   5
     3.2.  Extensions to IS-IS . . . . . . . . . . . . . . . . . . .   6
   4.  BIER Extensions . . . . . . . . . . . . . . . . . . . . . . .   7
     4.1.  Egress Protection Bit Index Routing Tables  . . . . . . .   7
     4.2.  Egress Protection Bit Index Forwarding Tables . . . . . .   8
     4.3.  Updated Forwarding Procedure  . . . . . . . . . . . . . .   8
     4.4.  Switching between EP and Normal Forwarding  . . . . . . .   9
   5.  Example Application of BIER Egress Protection . . . . . . . .  10
     5.1.  Example BIER Topology . . . . . . . . . . . . . . . . . .  10
     5.2.  BIRT and BIFT on a BFR  . . . . . . . . . . . . . . . . .  11
     5.3.  EP-BIRTs and EP-BIFTs on a BFR  . . . . . . . . . . . . .  12
     5.4.  Forwarding using EP-BIFT  . . . . . . . . . . . . . . . .  14
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  16
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  16
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  16
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  16
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  16
     9.2.  Informative References  . . . . . . . . . . . . . . . . .  17
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  18
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