An IPv6 based BIER Encapsulation and Encoding
draft-pfister-bier-over-ipv6-01

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Network Working Group                                         P. Pfister
Internet-Draft                                              IJ. Wijnands
Intended status: Standards Track                           Cisco Systems
Expires: May 4, 2017                                    October 31, 2016

             An IPv6 based BIER Encapsulation and Encoding
                    draft-pfister-bier-over-ipv6-01

Abstract

   This document specifies the packet format and procedures for
   transporting IPv6 payloads to multiple IPv6 destinations using the
   Bit Index Explicit Replication (BIER).  The BIER BitString is stored
   within the low-order bits of the IPv6 destination address while the
   high-order bits are used for unicast forwarding before entering the
   destination BIER domain, identifying whether a packet is a BIER
   packet, the destination Sub-Domain, the Set Identifier and the
   BitString length.

Status of This Memo

   This Internet-Draft is submitted in full conformance with the
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   This Internet-Draft will expire on May 4, 2017.

Copyright Notice

   Copyright (c) 2016 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
   (http://trustee.ietf.org/license-info) in effect on the date of
   publication of this document.  Please review these documents
   carefully, as they describe your rights and restrictions with respect
   to this document.  Code Components extracted from this document must

Pfister & Wijnands         Expires May 4, 2017                  [Page 1]
Internet-Draft               BIER over IPv6                 October 2016

   include Simplified BSD License text as described in Section 4.e of
   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

Table of Contents

   1.  Introduction  . . . . . . . . . . . . . . . . . . . . . . . .   2
   2.  Terminology . . . . . . . . . . . . . . . . . . . . . . . . .   3
   3.  IPv6 BIER Packet Format . . . . . . . . . . . . . . . . . . .   3
   4.  Multicast Flow Overlay Operations . . . . . . . . . . . . . .   4
   5.  Bier Layer Forwarding Operations  . . . . . . . . . . . . . .   4
   6.  Applicability Statement . . . . . . . . . . . . . . . . . . .   4
   7.  Security Considerations . . . . . . . . . . . . . . . . . . .   5
   8.  IANA Considerations . . . . . . . . . . . . . . . . . . . . .   5
   9.  References  . . . . . . . . . . . . . . . . . . . . . . . . .   5
     9.1.  Normative References  . . . . . . . . . . . . . . . . . .   5
     9.2.  Informative References  . . . . . . . . . . . . . . . . .   6
   Appendix A.  Acknowledgements . . . . . . . . . . . . . . . . . .   6
   Authors' Addresses  . . . . . . . . . . . . . . . . . . . . . . .   6

1.  Introduction

   The Bit Index Explicit Replication (BIER -
   [I-D.ietf-bier-architecture]) forwarding technique enables IP
   multicast transport across a BIER domain.  Its architecture is based
   on three different layers, a multicast flow overlay, a BIER Layer,
   and a routing underlay.  This document specifies the packet format
   and procedures enabling IPv6 payload transport to multiple
   destinations, hence defining the transport part of a BIER layer.

   BIER BitString is encoded in the low-order bits of the IPv6
   destination address of each packet.  The high-order bits of the IPv6
   destination address are used by intermediate routers for unicast
   forwarding, deciding whether a packet is a BIER packet, and if so, to
   identify the BIER Sub-Domain, Set Identifier and BitString length.

   Transported payloads can be of various types such as IPv6 or IPv4,
   unicast or multicast (e.g. using generic packet tunnelling
   [RFC2473]), or transported data (e.g. using UDP).  Any data that can
   be used as payload to an IPv6 packet can be encapsulated, but special
   care must be taken when forwarding some types of payloads.  For
   example, the UDP checksum may become invalid as the BIER BitString is
   modified.

   This technique is an alternative to the MPLS encapsulation
   [I-D.ietf-bier-mpls-encapsulation].  It may be appropriate when
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