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Versions: 00 01 02 03 04 05 06 RFC 6085

v6ops WG                                                   S. Gundavelli
Internet-Draft                                               M. Townsley
Updates: 2464 (if approved)                                     O. Troan
Intended status: Standards Track                                  W. Dec
Expires: April 16, 2011                                            Cisco
                                                        October 13, 2010


         Address Mapping of IPv6 multicast packets on Ethernet
                draft-gundavelli-v6ops-l2-unicast-05.txt

Abstract

   When transmitting an IPv6 packet with a multicast destination
   address, the IPv6 destination address is mapped to an Ethernet link-
   layer multicast address.  This document clarifies that a mapping of
   an IPv6 packet with a multicast destination address may in some
   circumstances map to an Ethernet link-layer unicast address.

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 http://datatracker.ietf.org/drafts/current/.

   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 April 16, 2011.

Copyright Notice

   Copyright (c) 2010 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
   include Simplified BSD License text as described in Section 4.e of



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   the Trust Legal Provisions and are provided without warranty as
   described in the Simplified BSD License.

















































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1.  Introduction

   Transmission of IPv6 Packets over Ethernet [RFC2464] section 7,
   specifies how an IPv6 packet with a multicast destination address is
   mapped into an Ethernet link-layer address.  This document extends
   this mapping to explicitly allow for a mapping of an IPv6 packet with
   a multicast destination address into an Ethernet link-layer unicast
   address, when it is clear that only one address is relevant.

   This mapping does not replace the mapping described in [RFC2464]
   section 7.  Sending a targeted multicast packet, i.e. sending an IPv6
   packet with a multicast destination address to an Ethernet link-layer
   unicast address, is only reasonable if the unicast address is known
   and is reasonably believed to be the only address relevant.

   The determination of the unicast Ethernet link-layer address and the
   construction of the outgoing IPv6 packet are out of scope for this
   document.

































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2.  Conventions

   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 RFC 2119 [RFC2119].














































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3.  Sending and receiving IPv6 multicast packets

   The following additional considerations apply to all IPv6 nodes when
   sending and receiving IPv6 multicast messages.

   o  An IPv6 node transmitting an IPv6 packet with a multicast
      destination address MAY use a unicast Ethernet link-layer address.

   o  An IPv6 node receiving an IPv6 packet with a multicast destination
      address and an Ethernet link-layer unicast address MUST NOT drop
      the packet as a result of the use of this form of address mapping.








































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4.  IANA Considerations

   This specification does not require any IANA actions.
















































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5.  Security Considerations

   This document does not introduce any new security vulnerabilities.
















































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6.  Acknowledgements

   The authors would like to acknowledge Bernard Aboba, Fred Baker, Wes
   Beebee, Ron Bonica, Olaf Bonness, Jean-Michel Combes, Ralph Droms,
   Alain Durand, Suresh Krishnan, Eric Levy-Abegnoli, Phil Roberts,
   Behcet Sarikaya, Hemant Singh, Mark Smith, Dave Thaler, Pascal
   Thubert, Stig Venaas and Eric Voit for their contributions and
   discussions on this topic.











































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7.  Normative References

   [RFC2119]  Bradner, S., "Key words for use in RFCs to Indicate
              Requirement Levels", BCP 14, RFC 2119, March 1997.

   [RFC2464]  Crawford, M., "Transmission of IPv6 Packets over Ethernet
              Networks", RFC 2464, December 1998.












































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Authors' Addresses

   Sri Gundavelli
   Cisco
   170 West Tasman Drive
   San Jose, CA  95134
   USA

   Email: sgundave@cisco.com


   Mark Townsley
   Cisco
   L'Atlantis, 11, Rue Camille Desmoulins
   ISSY LES MOULINEAUX, ILE DE FRANCE  92782
   France

   Email: townsley@cisco.com


   Ole Troan
   Cisco
   Oslo,
   Norway

   Email: ot@cisco.com


   Wojciech Dec
   Cisco
   Haarlerbergweg 13-19
   Amsterdam, Noord-Holland  1101 CH
   Netherlands

   Email: wdec@cisco.com
















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