Chapter 3 Dhcp Relay Agent Configuration; Introduction To Dhcp Relay Agent; Application Environment; Fundamentals - H3C S9500 Series Operation Manual

Operation Manual – DHCP
H3C S9500 Series Routing Switches

Chapter 3 DHCP Relay Agent Configuration

When configuring the DHCP relay agent, go to these sections for information you are
interested in:

Introduction to DHCP Relay Agent

Configuring DHCP Relay Agent
Displaying and Maintaining DHCP Relay Agent Configuration
DHCP Relay Agent Configuration Example
Troubleshooting DHCP Relay Agent Configuration
Note:
The DHCP relay agent configuration is supported only on VLAN interfaces.
3.1 Introduction to DHCP Relay Agent

3.1.1 Application Environment

Since DHCP clients request IP addresses via broadcast messages, the DHCP server
and clients must be on the same subnet. Therefore, a DHCP server must be available
on each subnet. It is not practical.
DHCP relay agent solves the problem. Via a relay agent, DHCP clients communicate
with a DHCP server on another subnet to obtain configuration parameters. Thus,
DHCP clients on different subnets can contact the same DHCP server for ease of
centralized management and cost reduction.

3.1.2 Fundamentals

Figure 3-1 shows a typical application of the DHCP relay agent.
Chapter 3 DHCP Relay Agent Configuration
3-1