6-16 DHCP Relay Agent ConfigurationWhen configuring the DHCP relay agent, go to these sections for information you are interested in:z Introduction to DHCP Relay Agentz DHCP Relay Agent Configuration Task Listz Configuring the DHCP Relay Agentz Displaying and Maintaining DHCP Relay Agent Configurationz DHCP Relay Agent Configuration Examplesz Troubleshooting DHCP Relay Agent ConfigurationThe DHCP relay agent configuration is supported only on VLAN interfaces.Introduction to DHCP Relay AgentApplication EnvironmentSince DHCP clients request IP addresses via broadcast messages, the DHCP server and clients mustbe on the same subnet. Therefore, a DHCP server must be available on each subnet, which is notpractical.DHCP relay agent solves the problem. Via a relay agent, DHCP clients communicate with a DHCPserver on another subnet to obtain configuration parameters. Thus, DHCP clients on different subnetscan contact the same DHCP server for ease of centralized management and cost reduction.FundamentalsFigure 6-1 shows a typical application of the DHCP relay agent.
