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

Document Type Active Internet-Draft (individual)
Authors Huaimo Chen  , Mike McBride  , Aijun Wang  , Gyan Mishra  , Yisong Liu  , 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                                         A. Wang
                                                           China Telecom
                                                               G. Mishra
                                                            Verizon Inc.
                                                                  Y. Liu
                                                            China Mobile
                                                                  Y. Fan
                                                            Casa Systems
                                                                  L. Liu
                                                                 Fujitsu
                                                                  X. Liu
                                                          Volta Networks
                                                       February 21, 2021

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

Abstract

   This document describes a mechanism for fast protection against the
   failure of an egress node of 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-flow state
   in the core of the domain.  For a multicast packet to the egress
   node, 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
   working documents as Internet-Drafts.  The list of current Internet-
   Drafts is at https://datatracker.ietf.org/drafts/current/.

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

   Internet-Drafts are draft documents valid for a maximum of six months
   and may be updated, replaced, or obsoleted by other documents at any
   time.  It is inappropriate to use Internet-Drafts as reference
   material or to cite them other than as "work in progress."

   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 Egress Protection . . . . . . . . . . . .   4
   3.  Protocol Extensions . . . . . . . . . . . . . . . . . . . . .   5
     3.1.  Extensions to OSPF  . . . . . . . . . . . . . . . . . . .   5
     3.2.  Extensions to IS-IS . . . . . . . . . . . . . . . . . . .   6
   4.  BIER-TE Extensions  . . . . . . . . . . . . . . . . . . . . .   7
     4.1.  Extensions to BIER-TE BIFT for Egress Protection  . . . .   7
     4.2.  Updated Forwarding Procedure  . . . . . . . . . . . . . .   7
   5.  Example Application of BIER-TE Egress Protection  . . . . . .   9
     5.1.  Example BIER-TE Topology  . . . . . . . . . . . . . . . .   9
     5.2.  BIER-TE BIFT on a BFR . . . . . . . . . . . . . . . . . .  10
     5.3.  Extended BIER-TE BIFT on a BFR  . . . . . . . . . . . . .  11
     5.4.  Forwarding using Extended BIER-TE BIFT  . . . . . . . . .  12
   6.  Security Considerations . . . . . . . . . . . . . . . . . . .  13
   7.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .  13
   8.  Acknowledgements  . . . . . . . . . . . . . . . . . . . . . .  14
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .  14
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .  14
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