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Link Selection sub-option for the Relay Agent Information Option for DHCPv4 (RFC3527)

IP.com Disclosure Number: IPCOM000012309D
Original Publication Date: 2003-Apr-01
Included in the Prior Art Database: 2003-Apr-29
Document File: 10 page(s) / 17K

Publishing Venue

Internet Society Requests For Comment (RFCs)

Related People

K. Kinnear: AUTHOR [+4]

Abstract

This document describes the link selection sub-option of the relay- agent-information option for the Dynamic Host Configuration Protocol (DHCPv4). The giaddr specifies an IP address which determines both a subnet, and thereby a link on which a Dynamic Host Configuration Protocol (DHCP) client resides as well as an IP address that can be used to communicate with the relay agent. The subnet-selection option allows the functions of the giaddr to be split so that when one entity is performing as a DHCP proxy, it can specify the subnet/link from which to allocate an IP address, which is different from the IP address with which it desires to communicate with the DHCP server. Analogous situations exist where the relay agent needs to specify the subnet/link on which a DHCP client resides, which is different from an IP address that can be used to communicate with the relay agent.

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Network Working Group� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � K. Kinnear

Request for Comments: 3527� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � M. Stapp

Category: Standards Track� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � R. Johnson

� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � J. Kumarasamy

� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � Cisco Systems

� � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � � April 2003

� � � � � � � � � � � � � � � � � � � � � � Link Selection sub-option

� � � � � � � � � � for the Relay Agent Information Option for DHCPv4

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 (2003).� All Rights Reserved.

Abstract

� � This document describes the link selection sub-option of the relay-

� � agent-information option for the Dynamic Host Configuration Protocol

� � (DHCPv4).� The giaddr specifies an IP address which determines both a

� � subnet, and thereby a link on which a Dynamic Host Configuration

� � Protocol (DHCP) client resides as well as an IP address that can be

� � used to communicate with the relay agent.� The subnet-selection

� � option allows the functions of the giaddr to be split so that when

� � one entity is performing as a DHCP proxy, it can specify the

� � subnet/link from which to allocate an IP address, which is different

� � from the IP address with which it desires to communicate with the

� � DHCP server.� Analogous situations exist where the relay agent needs

� � to specify the subnet/link on which a DHCP client resides, which is

� � different from an IP address that can be used to communicate with the

� � relay agent.

1.� Introduction

� � In RFC 2131, the giaddr specifies an IP address which determines a

� � subnet (and from there a link) on which a DHCP client resides as well

� � as an IP address which can be used to communicate with the relay

� � agent.� The subnet-selection option [RFC 3011] allows these functions

� � of the giaddr to be split, so that when one entity is performing as a

Kinnear, et al.� � � � � � � � � � � � Standards Track� � � � � � � � � � � � � � � � � � � � [Page 1]

RFC 3527� � � � � � � � � � � � � � Link Selection sub-option� � � � � � � � � � � � � April 2003

� � DHCP proxy, it can specify the subnet/link from which to allocate an

� � IP address that is different from the IP address with which i...