Dhcp Relay; Introduction To Dhcp Relay Agent - 3Com 7757 Configuration Manual

3com switch 7750 family

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Table of Contents

Introduction to DHCP

Usage of DHCP Relay

DHCP Relay Agent

Fundamentals

Since the packets are broadcasted in the process of obtaining IP addresses, DHCP

is only applicable to the situation that DHCP clients and DHCP servers are in the

same network segment, that is, you need to deploy at least one DHCP server for

each network segment, which is far from economical.

The DHCP relay agent is designed to address this problem. It enables DHCP clients

in a subnet to communicate with the DHCP server in another subnet so that the

DHCP clients can obtain IP addresses. In this case, the DHCP clients in multiple

networks can use the same DHCP server, which can decrease your cost and

provide a centralized administration.

Figure 155 illustrates a typical DHCP relay agent application.

Figure 155 Typical DHCP relay agent application

DHCP relay agents can transparently transmit broadcast packets on DHCP clients

or servers to the DHCP servers or clients in other network segments.

In the process of dynamic IP address assignment through the DHCP relay agent,

the DHCP client and DHCP server interoperate with each other in a similar way as

they do without the DHCP relay agent. The following sections only describe the

DHCP relay

ONFIGURATION

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