INTERNET-DRAFT                              R. Hinden, Ipsilon Networks
May 16, 1997                                          S. Deering, Cisco

                   IPv6 Multicast Address Assignments


Status of this Memo

   This document is an Internet Draft.  Internet Drafts are working
   documents of the Internet Engineering Task Force (IETF), its Areas,
   and its Working Groups.  Note that other groups may also distribute
   working documents as Internet Drafts.

   Internet Drafts are draft documents valid for a maximum of six
   months.  Internet Drafts may be updated, replaced, or obsoleted by
   other documents at any time.  It is not appropriate to use Internet
   Drafts as reference material or to cite them other than as a
   ``working draft'' or ``work in progress.''

   Please check the 1id-abstracts.txt listing contained in the internet-
   drafts Shadow Directories on,,,, or to learn the
   current status of any Internet Draft.

1.0 Introduction

   This document defines the initial assignment of IPv6 multicast
   addresses.  It is based on the "IP Version 6 Addressing Architecture"
   [ADDARCH] and current IPv4 multicast address assignment found in
   It adapts the IPv4 assignments that are relevant to IPv6 assignments.
   IPv4 assignments that were not relevant were not converted into IPv6
   assignments.  Comments are solicited on this conversion.

   All other IPv6 multicast addresses are reserved.

   Sections 2 and 3 specify reserved and preassigned IPv6 multicast
   addresses.  Section 4 defines guidelines for assigning new IPv6
   multicast addresses.

   The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",

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   document are to be interpreted as described in [RFC 2119].

2. Fixed Scope Multicast Addresses

   These permanently assigned multicast addresses are valid over a
   specified scope value.

2.1 Node-Local Scope

   FF01:0:0:0:0:0:0:1     All Nodes Address                  [ADDARCH]
   FF01:0:0:0:0:0:0:2     All Routers Address                [ADDARCH]

2.2 Link-Local Scope

   FF02:0:0:0:0:0:0:1     All Nodes Address                  [ADDARCH]
   FF02:0:0:0:0:0:0:2     All Routers Address                [ADDARCH]
   FF02:0:0:0:0:0:0:3     Unassigned                             [JBP]
   FF02:0:0:0:0:0:0:4     DVMRP Routers                  [RFC1075,JBP]
   FF02:0:0:0:0:0:0:5     OSPFIGP                        [RFC1583,Moy]
   FF02:0:0:0:0:0:0:6     OSPFIGP Designated Routers     [RFC1583,Moy]
   FF02:0:0:0:0:0:0:7     ST Routers                    [RFC1190,KS14]
   FF02:0:0:0:0:0:0:8     ST Hosts                      [RFC1190,KS14]
   FF02:0:0:0:0:0:0:9     RIP Routers                  [RFC1723,GSM11]
   FF02:0:0:0:0:0:0:A     EIGRP Routers                    [Farinacci]
   FF02:0:0:0:0:0:0:B     Mobile-Agents                 [Bill Simpson]

   FF02:0:0:0:0:0:0:D     All PIM Routers                  [Farinacci]
   FF02:0:0:0:0:0:0:E     RSVP-ENCAPSULATION                  [Braden]

   FF02:0:0:0:0:0:1:1     Link Name                       [Harrington]
   FF02:0:0:0:0:0:1:2     All-dhcp-agents              [Bound,Perkins]
   FF02:0:0:0:0:0:1:3     All-dhcp-servers             [Bound,Perkins]
   FF02:0:0:0:0:0:1:4     All-dhcp-relays              [Bound,Perkins]

   FF02:0:0:0:0:1:FFXX:XXXX     Solicited-Node Address       [ADDARCH]

2.3 Site-Local Scope

   FF05:0:0:0:0:0:0:2     All Routers Address                [ADDARCH]
   FF05:0:0:0:0:0:1:2     All-dhcp-agents              [Bound,Perkins]
   FF05:0:0:0:0:0:1:3     All-dhcp-servers             [Bound,Perkins]
   FF05:0:0:0:0:0:1:4     All-dhcp-relays              [Bound,Perkins]

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3.0 All Scope Multicast Addresses

   These permanently assigned multicast addresses are valid over all
   scope ranges.  This is shown by an "X" in the scope field of the
   address that means any legal scope value.

   Note that, as defined in [ADDARCH], IPv6 multicast addresses which
   are only different in scope represent different groups.  Nodes must
   join each group individually.

   The IPv6 multicast addresses with variable scope are as follows:

   FF0X:0:0:0:0:0:0:0     Reserved Multicast Address         [ADDARCH]

   FF0X:0:0:0:0:0:0:100   VMTP Managers Group           [RFC1045,DRC3]
   FF0X:0:0:0:0:0:0:101   Network Time Protocol (NTP)   [RFC1119,DLM1]
   FF0X:0:0:0:0:0:0:102   SGI-Dogfight                           [AXC]
   FF0X:0:0:0:0:0:0:103   Rwhod                                  [SXD]
   FF0X:0:0:0:0:0:0:104   VNP                                   [DRC3]
   FF0X:0:0:0:0:0:0:105   Artificial Horizons - Aviator          [BXF]
   FF0X:0:0:0:0:0:0:106   NSS - Name Service Server             [BXS2]
   FF0X:0:0:0:0:0:0:107   AUDIONEWS - Audio News Multicast      [MXF2]
   FF0X:0:0:0:0:0:0:108   SUN NIS+ Information Service          [CXM3]
   FF0X:0:0:0:0:0:0:109   MTP Multicast Transport Protocol       [SXA]
   FF0X:0:0:0:0:0:0:10A   IETF-1-LOW-AUDIO                       [SC3]
   FF0X:0:0:0:0:0:0:10B   IETF-1-AUDIO                           [SC3]
   FF0X:0:0:0:0:0:0:10C   IETF-1-VIDEO                           [SC3]
   FF0X:0:0:0:0:0:0:10D   IETF-2-LOW-AUDIO                       [SC3]
   FF0X:0:0:0:0:0:0:10E   IETF-2-AUDIO                           [SC3]
   FF0X:0:0:0:0:0:0:10F   IETF-2-VIDEO                           [SC3]

   FF0X:0:0:0:0:0:0:110   MUSIC-SERVICE             [Guido van Rossum]
   FF0X:0:0:0:0:0:0:111   SEANET-TELEMETRY             [Andrew Maffei]
   FF0X:0:0:0:0:0:0:112   SEANET-IMAGE                 [Andrew Maffei]
   FF0X:0:0:0:0:0:0:113   MLOADD                              [Braden]
   FF0X:0:0:0:0:0:0:114   any private experiment                 [JBP]
   FF0X:0:0:0:0:0:0:115   DVMRP on MOSPF                         [Moy]
   FF0X:0:0:0:0:0:0:116   SVRLOC                            [Veizades]
   FF0X:0:0:0:0:0:0:117   XINGTV                      <>
   FF0X:0:0:0:0:0:0:118   microsoft-ds         <>
   FF0X:0:0:0:0:0:0:119   nbc-pro           <>
   FF0X:0:0:0:0:0:0:11A   nbc-pfn           <>
   FF0X:0:0:0:0:0:0:11B   lmsc-calren-1                         [Uang]
   FF0X:0:0:0:0:0:0:11C   lmsc-calren-2                         [Uang]
   FF0X:0:0:0:0:0:0:11D   lmsc-calren-3                         [Uang]
   FF0X:0:0:0:0:0:0:11E   lmsc-calren-4                         [Uang]
   FF0X:0:0:0:0:0:0:11F   ampr-info                          [Janssen]

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   FF0X:0:0:0:0:0:0:120   mtrace                              [Casner]
   FF0X:0:0:0:0:0:0:121   RSVP-encap-1                        [Braden]
   FF0X:0:0:0:0:0:0:122   RSVP-encap-2                        [Braden]
   FF0X:0:0:0:0:0:0:123   SVRLOC-DA                         [Veizades]
   FF0X:0:0:0:0:0:0:124   rln-server                            [Kean]
   FF0X:0:0:0:0:0:0:125   proshare-mc                          [Lewis]
   FF0X:0:0:0:0:0:0:126   dantz                               [Yackle]
   FF0X:0:0:0:0:0:0:127   cisco-rp-announce                [Farinacci]
   FF0X:0:0:0:0:0:0:128   cisco-rp-discovery               [Farinacci]
   FF0X:0:0:0:0:0:0:129   gatekeeper                            [Toga]
   FF0X:0:0:0:0:0:0:12A   iberiagames                        [Marocho]

   FF0X:0:0:0:0:0:0:201  "rwho" Group (BSD) (unofficial)         [JBP]
   FF0X:0:0:0:0:0:0:202   SUN RPC PMAPPROC_CALLIT               [BXE1]

    -FF0X:0:0:0:0:0:2:7FFD  Multimedia Conference Calls          [SC3]
   FF0X:0:0:0:0:0:2:7FFE    SAPv1 Announcements                  [SC3]
   FF0X:0:0:0:0:0:2:7FFF    SAPv0 Announcements (deprecated)     [SC3]
    -FF0X:0:0:0:0:0:2:FFFF  SAP Dynamic Assignments              [SC3]

4.0 Assignment of New IPv6 Multicast Addresses

   Multicast address as defined in [ADDARCH] have the following format:

    |   8    |  4 |  4 |                  112 bits                   |
    +------ -+----+----+---------------------------------------------+
    |11111111|flgs|scop|                  group ID                   |

   The current approach [RFC1972] to map IPv6 multicast addresses into
   IEEE 802 MAC addresses takes the low order 32 bits of the IPv6
   multicast address and uses it to create a MAC address.  Groups ID's
   less than or equal to 32 bits will generate unique MAC addresses.
   Due to this new IPv6 multicast addresses should be assigned so that
   the group identifier is always in the low order 32 bits as shown in
   the following:

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    |   8    |  4 |  4 |          80 bits          |     32 bits     |
    +------ -+----+----+---------------------------+-----------------+
    |11111111|flgs|scop|   reserved must be zero   |    group ID     |

   While this limits the number of permanent IPv6 multicast groups to
   2^32 this is unlikely to be a limitation in the future.  If it
   becomes necessary to exceed this limit in the future multicast will
   still work but the processing will be sightly slower.

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5.0 References

   [ADDARCH] Hinden, R., "IP Version 6 Addressing Architecture",
             Internet Draft, <draft-ietf-ipngwg-addr-arch-00.txt>, May

   [AUTORFC] Thompson, S., "IPv6 Stateless Address Autoconfiguration",
             Internet Draft.

   [ETHER]  Crawford, M., "Transmission of IPv6 Packets over Ethernet
             Networks", Internet Draft, <draft-ietf-ipngwg-trans-
             ethernet-00.txt>, March 1997.

   [RFC1045] Cheriton, D., "VMTP: Versatile Message Transaction Protocol
             Specification", RFC 1045, Stanford University, February

   [RFC1075] Waitzman, D., C. Partridge, and S. Deering "Distance Vector
             Multicast Routing Protocol", RFC-1075, BBN STC, Stanford
             University, November 1988.

   [RFC1112] Deering, S., "Host Extensions for IP Multicasting", STD 5,
             RFC 1112, Stanford University, August 1989.

   [RFC1119] Mills, D., "Network Time Protocol (Version 1),
             Specification and Implementation", STD 12, RFC 1119,
             University of Delaware, July 1988.

   [RFC1190] Topolcic, C., Editor, "Experimental Internet Stream
             Protocol, Version 2 (ST-II)", RFC 1190, CIP Working Group,
             October 1990.

   [RFC1583] Moy, J., "The OSPF Specification", RFC 1583, Proteon, March

   [RFC1723] Malkin, G., "RIP Version 2: Carying Additional
             Information", RFC 1723, Xylogics, November 1994.

   [RFC2119] S. Bradner, "Key words for use in RFCs to Indicate
             Requirement Levels", RFC2119, BCP14, March 1997.

6. People


   [AXC] Andrew Cherenson <arc@SGI.COM>

   [Braden] Bob Braden, <>, April 1996.

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   [Bob Brenner]

   [Bressler] David J. Bressler, <>, April 1996.


   [Bound] Jim Bound <>

   [BXE1] Brendan Eic <>

   [BXF] Bruce Factor <ahi!bigapple!bruce@uunet.UU.NET>

   [BXS2] Bill Schilit <>

   [Casner] Steve Casner, <>, January 1995.

   [CXM3] Chuck McManis <>

   [Tim Clark]

   [DLM1] David Mills <Mills@HUEY.UDEL.EDU>

   [DRC3] Dave Cheriton <cheriton@PESCADERO.STANFORD.EDU>

   [DXS3] Daniel Steinber <Daniel.Steinberg@Eng.Sun.COM>

   [Farinacci] Dino Farinacci, <>

   [GSM11] Gary S. Malkin <GMALKIN@XYLOGICS.COM>

   [Harrington] Dan Harrington, <>, July 1996.


   [IANA] IANA <>

   [Janssen] Rob Janssen, <>, January 1995.

   [JBP] Jon Postel <>

   [JXM1] Jim Miner <>

   [Kean] Brian Kean, <>, August 1995.

   [KS14] <mystery contact>

   [Lee] Choon Lee, <>, April 1996.

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   [Lewis] Mark Lewis, <>, October 1995.

   [Malamud] Carl Malamud, <>, January 1996.

   [Andrew Maffei]

   [Marohco] Jose Luis Marocho, <>, July 1996.

   [Moy] John Moy <>

   [MXF2] Martin Forssen <>

   [Perkins] Charlie Perkins, <>

   [Guido van Rossum]

   [SC3] Steve Casner <>

   [Simpson] Bill Simpson <> November 1994.

   [Joel Snyder]

   [SXA] Susie Armstrong <Armstrong.wbst128@XEROX.COM>

   [SXD] Steve Deering <deering@PARC.XEROX.COM>

   [tynan] Dermot Tynan, <>, August 1995.

   [Toga] Jim Toga, <>, May 1996.

   [Uang] Yea Uang <> November 1994.

   [Veizades] John Veizades,  <>, May 1995.

   [Yackle] Dotty Yackle, <>, February 1996.

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7.0 Security Considerations

   Documents of this type do not directly impact the security of the
   Internet infrastructure or its applications.

8.0 Authors' Addresses

     Robert M. Hinden
     Ipsilon Networks, Inc.
     232 Java Way
     Sunnyvale, CA 94089

     phone: +1 415 990 2004

     Stephen E. Deering
     Cisco Systems, Inc.
     170 West Tasman Drive
     San Jose, CA 95134-1706

     phone: +1 408 527-8213

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