RFC 2928 (rfc2928) - Page 2 of 7

Initial IPv6 Sub-TLA ID Assignments

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