An IPv6 Provider-Based Unicast Address Format (RFC2073)
Original Publication Date: 1997-Jan-01
Included in the Prior Art Database: 2019-Feb-16
Internet Society Requests For Comment (RFCs)
Y. Rekhter: AUTHOR [+4]
This document defines an IPv6 provider-based unicast address format for use in the Internet. [STANDARDS-TRACK]
Network Working Group Y. Rekhter Request for Comments: 2073 cisco Category: Standards Track P. Lothberg STUPI.AB R. Hinden Ipsilon Networks S. Deering Xerox PARC J. Postel ISI Editors January 1997
An IPv6 Provider-Based Unicast Address Format
Status of this Memo
This document specifies an Internet standards track protocol for the Internet community, and requests discussion and suggestions for improvements. Please refer to the current edition of the "Internet Official Protocol Standards" (STD 1) for the standardization state and status of this protocol. Distribution of this memo is unlimited.
This document defines an IPv6 provider-based unicast address format for use in the Internet. The address format defined in this document is consistent with the "IPv6 Addressing Architecture" [ARCH] and the "An Architecture for IPv6 Unicast Address Allocation" [ALLOC], and is intended to facilitate scalable Internet routing.
The unicast address format defined in this document doesn’t preclude the use of other unicast address formats.
2.0 Overview of the IPv6 Address
IPv6 addresses are 128-bit identifiers for interfaces and sets of interfaces. There are three types of addresses: Unicast, Anycast, and Multicast. This document defines a specific type of Unicast address.
In this document, fields in addresses are given specific names, for example "subscriber". When this name is used with the term "ID" (for "identifier") after the name (e.g., "subscriber ID"), it refers to the contents of the named field. When it is used with the term "prefix" (e.g., "subscriber prefix") it refers to all of the address up to and including this field.
Rekhter, et. al. Standards Track [Page 1]
RFC 2073 IPv6 Provider-Based Unicast Address Format January 1997
The specific type of an IPv6 address is indicated by the leading bits in the address. The variable-length field comprising these leading bits is called the Format Prefix (FP).
This document defines an address format for the 010 (binary) Format Prefix for Provider-Based Unicast addresses. The same address format could be used for other Format Prefixes, as long as these Format Prefixes also identify IPv6 unicast addresses. Only the "010" Format Prefix is defined here.
3.0 IPv6 Provider-Based Unicast Address Format
This document defines an address format for the IPv6 provider-based unicast address assignment. It is expected that this address format will be widely used for IPv6 nodes connected to the Internet.
The address format defined in this document conforms to the "Architecture for IPv6 Unicast Address Allocation" [ALLOC]. Specifically, the format is designed to support aggregation of network layer reachability information at multiple levels of routing hierarchy.
For addresses of the format described in this document the address administration is organized into a three level hierarchy -- registry, provider, and subscriber. The address format defined here allows flexible address allocation at each level of the...