Problem Statement of BIER IPv6 Encapsulation
draft-mcbride-bier-ipv6-problem-statement-00

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BIER                                                          M. McBride
Internet-Draft                                                    J. Xie
Intended status: Standards Track                                  Huawei
Expires: August 4, 2019                                 January 31, 2019

              Problem Statement of BIER IPv6 Encapsulation
              draft-mcbride-bier-ipv6-problem-statement-00

Abstract

   The BIER WG has a charter item to work on mechanisms which use BIER
   natively in IPv6.  This document is intended to help the WG with this
   effort by describing the problem space of transporting packets, with
   Bit Index Explicit Replication (BIER) headers, in an IPv6
   environment.  There will be a need to send IPv6 payloads, to multiple
   IPv6 destinations, using BIER.  There have been several proposed
   solutions in this area.  But there hasn't been a document which
   describes the problem and why this may be necessary.  The goal of
   this document is to describe the BIER IPv6 problem space, basic use
   cases, why new solutions may be needed and briefly summarize some of
   the proposed solutions.

Status of This Memo

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Copyright Notice

   Copyright (c) 2019 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
   Provisions Relating to IETF Documents
   (https://trustee.ietf.org/license-info) in effect on the date of

McBride & Xie            Expires August 4, 2019                 [Page 1]
Internet-Draft         BIER IPv6 Problem Statement          January 2019

   publication of this document.  Please review these documents
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Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
     1.1.  Requirements Language . . . . . . . . . . . . . . . . . .   3
     1.2.  Terminology . . . . . . . . . . . . . . . . . . . . . . .   3
   2.  Problem Statement . . . . . . . . . . . . . . . . . . . . . .   3
   3.  BIER IPv6 encapsulation Scenario's  . . . . . . . . . . . . .   3
     3.1.  BIERv6 for Access Network . . . . . . . . . . . . . . . .   4
     3.2.  BIERv6 for Data Center  . . . . . . . . . . . . . . . . .   4
     3.3.  BIERv6 for Core Networks  . . . . . . . . . . . . . . . .   4
     3.4.  Implications for BIER in SRv6 . . . . . . . . . . . . . .   4
   4.  Example Proposed Solutions  . . . . . . . . . . . . . . . . .   5
     4.1.  Encode Bitstring in IPv6 destination address  . . . . . .   6
     4.2.  Add BIER header into IPv6 Extension Header  . . . . . . .   6
     4.3.  Transport BIER as IPv6 payload  . . . . . . . . . . . . .   7
     4.4.  Tunneling BIER in a IPv6 tunnel . . . . . . . . . . . . .   7
   5.  Suggested Requirements  . . . . . . . . . . . . . . . . . . .   8
   6.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   8
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   8
   8.  Acknowledgement . . . . . . . . . . . . . . . . . . . . . . .   8
   9.  Normative References  . . . . . . . . . . . . . . . . . . . .   8
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .  10

1.  Introduction

   Bit Index Explicit Replication (BIER) [RFC8279] is an architecture
   that provides optimal multicast forwarding, without requiring
   intermediate routers to maintain per-flow state, through the use of a
   multicast-specific BIER header.  [RFC8296] defines two types of BIER
   encapsulation to run on physical links: one is BIER MPLS
   encapsulation to run on various physical links that support MPLS, the
   other is BIER Ethernet encapsulation to run on ethernet links, with
   an ethertype 0xAB37.  This document describes using BIER in non-MPLS
   IPv6 environments.  We explain the problem space of transporting IPv6
   payloads to multiple IPv6 destinations using BIER.  This can include
   native IPv6 encapsulation and generic tunneling.  There have been
   several proposed solutions in this area.  But there hasn't been a
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