Initial IPv6 Sub-TLA ID Assignments
RFC 2928

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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