2-1
2 DHCP Relay Agent Configuration
When configuring the DHCP relay agent, go to these sections for information you are interested in:
z Introduction to DHCP Relay Agent
z DHCP Relay Agent Configuration Task List
z Configuring the DHCP Relay Agent
z Displaying and Maintaining DHCP Relay Agent Configuration
z DHCP Relay Agent Configuration Examples
z Troubleshooting DHCP Relay Agent Configuration
The DHCP relay agent configuration is supported only on VLAN interfaces.
Introduction to DHCP Relay Agent
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, which 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.
Fundamentals
Figure 2-1 shows a typical application of the DHCP relay agent.
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