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Network Working Group                                          R. Hinden
Request for Comments: 2928                                         Nokia
Category: Informational                                       S. Deering
                                                                   Cisco
                                                                 R. Fink
                                                                    LBNL
                                                                 T. Hain
                                                               Microsoft
                                                          September 2000


                  Initial IPv6 Sub-TLA ID Assignments

Status of this Memo

   This memo provides information for the Internet community.  It does
   not specify an Internet standard of any kind.  Distribution of this
   memo is unlimited.

Copyright Notice

   Copyright (C) The Internet Society (2000).  All Rights Reserved.

Abstract

   This document defines initial assignments of IPv6 Sub-Top-Level
   Aggregation Identifiers (Sub-TLA ID) to the Address Registries.  It
   is intended as technical input to the Internet Assigned Numbers
   Authority (IANA) from the Internet Engineering Task Force (IETF)
   Internet Protocol Next Generation (IPNG) and Next Generation
   Transition (NGTRANS) working groups, as an input to the process of
   developing guidelines for the allocation of IPv6 addresses.

   This document was originally developed to provide advice to IANA in
   the fall of 1998 and is being published at this time for the
   historical record.  The Internet Architecture Board (IAB)
   subsequently requested that the IANA delegate these assignments to
   the Address Registries.  The IANA did this and the Address Registries
   are now using them to assign IPv6 addresses.

1. Introduction

   This document was originally developed to provide advice to IANA in
   the fall of 1998 and is being published at this time for the
   historical record.  The IAB subsequently requested that the IANA
   delegate these assignments to the Address Registries.  The IANA did
   this and the Address Registries are now using them to assign IPv6
   addresses.



Hinden, et al.               Informational                      [Page 1]

RFC 2928          Initial IPv6 Sub-TLA ID Assignments     September 2000


   This document defines initial assignments of IPv6 Sub-TLA Aggregation
   Identifiers (Sub-TLA ID) to the Address Registries.  It is intended
   as technical input to the IANA from the IETF IP Next Generation
   (IPNG) and Next Generation Transition (NGTRANS) working groups, as an
   input to the process of developing guidelines for the allocation of
   IPv6 addresses.

   The IAB and IESG have authorized the Internet Assigned Numbers
   Authority (IANA) as the appropriate entity to have the responsibility
   for the management of the IPv6 address space as defined in [ALLOC].

   The proposed initial assignment described in the document is
   consistent with:

      - RFC 2373,"IP Version 6 Addressing Architecture" [ARCH]
      - RFC 2374 "An Aggregatable Global Unicast Address Format" [AGGR]
      - RFC 2450 "Proposed TLA and NLA Assignment Rules" [TLA-RULES]

2. Background

   [TLA-RULES] specifies that TLA assignments will be done in two
   stages.  The first stage is to allocate a Sub-TLA ID.  This document
   specifies the initial assignments of Sub-TLA ID's to the Registries.

   As defined in [TLA-RULES] Section 5.1:

     "Sub-TLA ID's are assigned out of TLA ID 0x0001 as follows.  Note
      that use of the Reserved field to create the Sub-TLA field is
      specific to TLA ID 0x0001.  It does not affect any other TLA.

         | 3  |    13    |    13   |       19      |
         +----+----------+---------+---------------+
         | FP |   TLA    | Sub-TLA |       NLA     |
         |    |   ID     |         |       ID      |
         +----+----------+---------+---------------+

      where:

       FP = 001 = Format Prefix

          This is the Format Prefix used to identify aggregatable global
          unicast addresses.

       TLA ID = 0x0001 = Top-Level Aggregation Identifier

          This is the TLA ID assigned by the IANA for Sub-TLA
          allocation.




Hinden, et al.               Informational                      [Page 2]

RFC 2928          Initial IPv6 Sub-TLA ID Assignments     September 2000


       Sub-TLA ID = Sub-TLA Aggregation Identifier

          The Sub-TLA ID field is used by the registries for initial
          allocations to organizations meeting the requirements in
          Section 5.2 of this document.  The IANA will assign small
          blocks (e.g., few hundred) of Sub-TLA ID's to registries.  The
          registries will assign the Sub-TLA ID's to organizations
          meeting the requirements specified in Section 5.2.  When the
          registries have assigned all of their Sub-TLA ID's they can
          request that the IANA give them another block.  The blocks do
          not have to be contiguous.  The IANA may also assign Sub-TLA
          ID's to organizations directly.  This includes the temporary
          TLA assignment for testing and experimental usage for
          activities such as the 6bone or new approaches like exchanges.

       NLA ID = Next-Level Aggregation Identifier

          Next-Level Aggregation ID's are used by organizations assigned
          a TLA ID to create an addressing hierarchy and to identify
          sites.  The organization can assign the top part of the NLA ID
          in a manner to create an addressing hierarchy appropriate to
          its network."

   Note: In the above quote from [TLA-RULES] the references to "Section
   5.2" refer to section 5.2 in [TLA-RULES].


























Hinden, et al.               Informational                      [Page 3]

RFC 2928          Initial IPv6 Sub-TLA ID Assignments     September 2000


3. Initial Assignments

   As specified in [TLA-RULES], Sub-TLA ID assignments are made in
   blocks.  The initial Sub-TLA ID assignments to IP address registries
   are in blocks of 64 Sub-TLA IDs.  These assignments are listed below.

 Binary Value      IPv6 Prefix Range                 Assignment
 ----------------  -------------------------------   -------------------
 0000 000X XXXX X  2001:0000::/29 - 2001:01F8::/29   IANA
 0000 001X XXXX X  2001:0200::/29 - 2001:03F8::/29   APNIC
 0000 010X XXXX X  2001:0400::/29 - 2001:05F8::/29   ARIN
 0000 011X XXXX X  2001:0600::/29 - 2001:07F8::/29   RIPE NCC
 0000 100X XXXX X  2001:0800::/29 - 2001:09F8::/29   (future assignment)
 0000 101X XXXX X  2001:0A00::/29 - 2001:0BF8::/29   (future assignment)
 0000 110X XXXX X  2001:0C00::/29 - 2001:0DF8::/29   (future assignment)
 0000 111X XXXX X  2001:0E00::/29 - 2001:0FF8::/29   (future assignment)
 0001 000X XXXX X  2001:1000::/29 - 2001:11F8::/29   (future assignment)
   .   .    .
   .   .    .
   .   .    .
 1111 111X XXXX X  2001:FE00::/29 - 2001:FFF8::/29   (future assignment)

 Where "X" indicates "0" or "1".

   All other Sub-TLA ID values not listed above are reserved.

   When a registry has assigned all of the Sub-TLA IDs in their block
   they can request that the IANA provide another block.  The blocks
   assigned to a registry do not have to be contiguous.

   The block of Sub-TLA IDs assigned to the IANA (i.e., 2001:0000::/29 -
   2001:01F8::/29) is for assignment for testing and experimental usage
   to support activities such as the 6bone, and for new approaches like
   exchanges.

4. Acknowledgments

   The authors would like to express their thanks to Joyce K. Reynolds,
   Thomas Narten, Kim Hubbard, Mirjam Kuehne, and Brian Carpenter for
   their help with this document.

5. Security Considerations

   IPv6 addressing documents do not have any direct impact on Internet
   infrastructure security.  Authentication of IPv6 packets is defined
   in [AUTH].  Authentication of the ownership of prefixes to avoid
   "prefix stealing" is a related security issue but is beyond the scope
   of this document.



Hinden, et al.               Informational                      [Page 4]

RFC 2928          Initial IPv6 Sub-TLA ID Assignments     September 2000


6. References

   [AGGR]      Hinden, R., Deering, S. and M. O'Dell, "An Aggregatable
               Global Unicast Address Format", RFC 2374, July 1998.

   [ALLOC]     IAB and IESG, "IPv6 Address Allocation Management", RFC
               1881, December 1995.

   [ARCH]      Hinden, R., "IP Version 6 Addressing Architecture", RFC
               2373, July 1998.

   [AUTH]      Kent, S. and R. Atkinson, "IP Authentication Header", RFC
               2402, November 1998.

   [IPV6]      Deering, S. and R. Hinden, "Internet Protocol, Version 6
               (IPv6) Specification", RFC 2460, December 1998.

   [RFC2026]   Bradner, S., "The Internet Standards Process -- Revision
               3", BCP 9, RFC 2026, October 1996.

   [TLA-RULES] Hinden, R., "Proposed TLA and NLA Assignment Rules", RFC
               2450, December 1998.

   [TST-ALLOC] Hinden, R., Fink R. and J. Postel, "IPv6 Testing Address
               Allocation", RFC 2471, December 1998.


























Hinden, et al.               Informational                      [Page 5]

RFC 2928          Initial IPv6 Sub-TLA ID Assignments     September 2000


7. Authors' Addresses

   Robert M. Hinden
   Nokia
   313 Fairchild Drive
   Mountain View, CA 94043
   USA

   Phone: +1 650 625-2004
   EMail: hinden@iprg.nokia.com


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

   Phone: +1 408 527-8213
   EMail: deering@cisco.com


   Robert L. Fink
   Lawrence Berkeley National Lab
   1 Cyclotron Rd.
   Bldg 50A, Room 3111
   Berkeley, CA 94720
   USA

   Phone: +1 510 486-5692
   EMail: rlfink@lbl.gov


   Tony Hain
   Microsoft

   Phone: +1 425 703-6619
   EMail: tonyhain@microsoft.com













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RFC 2928          Initial IPv6 Sub-TLA ID Assignments     September 2000


8.  Full Copyright Statement

   Copyright (C) The Internet Society (2000).  All Rights Reserved.

   This document and translations of it may be copied and furnished to
   others, and derivative works that comment on or otherwise explain it
   or assist in its implementation may be prepared, copied, published
   and distributed, in whole or in part, without restriction of any
   kind, provided that the above copyright notice and this paragraph are
   included on all such copies and derivative works.  However, this
   document itself may not be modified in any way, such as by removing
   the copyright notice or references to the Internet Society or other
   Internet organizations, except as needed for the purpose of
   developing Internet standards in which case the procedures for
   copyrights defined in the Internet Standards process must be
   followed, or as required to translate it into languages other than
   English.

   The limited permissions granted above are perpetual and will not be
   revoked by the Internet Society or its successors or assigns.

   This document and the information contained herein is provided on an
   "AS IS" basis and THE INTERNET SOCIETY AND THE INTERNET ENGINEERING
   TASK FORCE DISCLAIMS ALL WARRANTIES, EXPRESS OR IMPLIED, INCLUDING
   BUT NOT LIMITED TO ANY WARRANTY THAT THE USE OF THE INFORMATION
   HEREIN WILL NOT INFRINGE ANY RIGHTS OR ANY IMPLIED WARRANTIES OF
   MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE.

Acknowledgement

   Funding for the RFC Editor function is currently provided by the
   Internet Society.



















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