An Architecture for IPv6 Unicast Address Allocation (RFC1887)
Original Publication Date: 1995-Dec-01
Included in the Prior Art Database: 2019-Feb-12
Internet Society Requests For Comment (RFCs)
Y. Rekhter: AUTHOR [+1]
This document provides an architecture for allocating IPv6  unicast addresses in the Internet. This document provides information for the Internet community. This memo does not specify an Internet standard of any kind.
Network Working Group Y. Rekhter Request for Comments: 1887 cisco Systems Category: Informational T. Li cisco Systems Editors December 1995
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 subscriber simultaneously.
Rekhter & Li Informational [Page 1]
RFC 1887 IPv6 Unicast Address Allocation Architecture December 1995
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 levels of hierarchy in Internet addressing to support network growth;
- The recommended mapping between Internet topological entities (i.e., service providers, and service subscribers) and IPv6 addressing and routing components;
- The recommended division of IPv6 address assignment am...