Dismiss
InnovationQ/InnovationQ Plus content will be updated on Sunday, June 25, 10am ET, with new patent and non-patent literature collections. Click here to learn more.
Browse Prior Art Database

Reserved IPv6 Subnet Anycast Addresses (RFC2526)

IP.com Disclosure Number: IPCOM000003111D
Original Publication Date: 1999-Mar-01
Included in the Prior Art Database: 2000-Sep-13
Document File: 5 page(s) / 13K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

D. Johnson: AUTHOR [+2]

Abstract

The IP Version 6 addressing architecture defines an "anycast" address as an IPv6 address that is assigned to one or more network interfaces (typically belonging to different nodes), with the property that a packet sent to an anycast address is routed to the "nearest" interface having that address, according to the routing protocols' measure of distance. This document defines a set of reserved anycast addresses within each subnet prefix, and lists the initial allocation of these reserved subnet anycast addresses.

This text was extracted from a ASCII Text document.
This is the abbreviated version, containing approximately 22% of the total text.

Network Working Group D. Johnson

Request for Comments: 2526 Carnegie Mellon University

Category: Standards Track S. Deering

Cisco Systems, Inc.

March 1999

Reserved IPv6 Subnet Anycast Addresses

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.

Copyright Notice

Copyright (C) The Internet Society (1999). All Rights Reserved.

Abstract

The IP Version 6 addressing architecture defines an "anycast" address

as an IPv6 address that is assigned to one or more network interfaces

(typically belonging to different nodes), with the property that a

packet sent to an anycast address is routed to the "nearest"

interface having that address, according to the routing protocols'

measure of distance. This document defines a set of reserved anycast

addresses within each subnet prefix, and lists the initial allocation

of these reserved subnet anycast addresses.

1. Introduction

IP Version 6 (IPv6) defines a new type of address, known as an

"anycast" address, that allows a packet to be routed to one of a

number of different nodes all responding to the same address [2, 3].

The anycast address may be assigned to one or more network interfaces

(typically on different nodes), with the network delivering each

packet addressed to this address to the "nearest" interface based on

the notion of "distance" determined by the routing protocols in use.

The uses of anycast addresses are still evolving, but such addresses

offer the potential for a number of important services [5, 6]. For

example, an anycast address may be used to allow nodes to access one

of a collection of servers providing a well-known service, without

manual configuration in each node of the list of servers; or an

anycast address may be used in a source route to force routing

through a specific internet service provider, without limiting

routing to a single specific router providing access to that ISP.

IPv6 defines a required Subnet-Router anycast address [3] for all

routers within a subnet prefix, and allows additional anycast

addresses to be taken from the unicast address space. This document

defines an additional set of reserved anycast addresses within each

subnet prefix, and lists the initial allocation of these reserved

subnet anycast addresses.

The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT",

"SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this

document are to be interpreted as d...