Movatterモバイル変換

Internet Engineering Task Force (IETF)                     S. GundavelliRequest for Comments: 6085                                   M. TownsleyUpdates:2464                                                   O. TroanCategory: Standards Track                                         W. DecISSN: 2070-1721                                                    Cisco                                                            January 2011Address Mapping of IPv6 Multicast Packets on EthernetAbstract   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 is an Internet Standards Track document.   This document is a product of the Internet Engineering Task Force   (IETF).  It represents the consensus of the IETF community.  It has   received public review and has been approved for publication by the   Internet Engineering Steering Group (IESG).  Further information on   Internet Standards is available inSection 2 of RFC 5741.   Information about the current status of this document, any errata,   and how to provide feedback on it may be obtained athttp://www.rfc-editor.org/info/rfc6085.Copyright Notice   Copyright (c) 2011 IETF Trust and the persons identified as the   document authors.  All rights reserved.   This document is subject toBCP 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   the Trust Legal Provisions and are provided without warranty as   described in the Simplified BSD License.Gundavelli, et al.           Standards Track                    [Page 1]

RFC 6085           Unicast Transmission on Link Layer       January 20111.  Introduction   "Transmission of IPv6 Packets over Ethernet Networks" ([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.  The determination of the unicast Ethernet link-layer   address and the construction of the outgoing IPv6 packet are out of   scope for this document.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 inRFC 2119 [RFC2119].3.  Receiving IPv6 Multicast Packets   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.4.  Security Considerations   This document does not introduce any new security vulnerabilities.5.  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.6.  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.Gundavelli, et al.           Standards Track                    [Page 2]

RFC 6085           Unicast Transmission on Link Layer       January 2011Authors' 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.comGundavelli, et al.           Standards Track                    [Page 3]