An Architecture for IPv6 Unicast Address Allocation (RFC1887)
Original Publication Date: 1995-Dec-01
Included in the Prior Art Database: 2000-Sep-13
Internet Society Requests For Comment (RFCs)
Y. Rekhter: AUTHOR [+3]
This document provides an architecture for allocating IPv6  unicast addresses in the Internet. The overall IPv6 addressing architecture is defined in . This document does not go into the details of an addressing plan.
Network Working Group Y. Rekhter
Request for Comments: 1887 cisco Systems
Category: Informational T. Li
An Architecture for IPv6 Unicast Address Allocation
Status of this Memo
This document provides information for the Internet community. This
memo does not specify an Internet standard of any kind. Distribution
of this memo is unlimited.
This document provides an architecture for allocating IPv6 
unicast addresses in the Internet. The overall IPv6 addressing
architecture is defined in . This document does not go into the
details of an addressing plan.
The global internet can be modeled as a collection of hosts
interconnected via transmission and switching facilities. Control
over the collection of hosts and the transmission and switching
facilities that compose the networking resources of the global
internet is not homogeneous, but is distributed among multiple
administrative authorities. Resources under control of a single
administration within a contiguous segment of network topology form a
domain. For the rest of this paper, `domain' and `routing domain'
will be used interchangeably.
Domains that share their resources with other domains are called
network service providers (or just providers). Domains that utilize
other domain's resources are called network service subscribers (or
just subscribers). A given domain may act as a provider and a
There are two aspects of interest when discussing IPv6 unicast
address allocation within the Internet. The first is the set of
administrative requirements for obtaining and allocating IPv6
addresses; the second is the technical aspect of such assignments,
having largely to do with routing, both within a routing domain
(intra-domain routing) and between routing domains (inter-domain
routing). This paper focuses on the technical issues.
In the current Internet many routing domains (such as corporate and
campus networks) attach to transit networks (such as regionals) in
only one or a small number of carefully controlled access points.
The former act as subscribers, while the latter act as providers.
Addressing solutions which require substantial changes or constraints
on the current topology are not considered.
The architecture and recommendations in this paper are oriented
primarily toward the large-scale division of IPv6 address allocation
in the Internet. Topics covered include:
- Benefits of encoding some topological information in IPv6
addresses to significantly reduce routing protocol overhead;
- The anticipated need for additional ...