DHCP relay agent configuration example

As shown in Figure 28, configure the DHCP relay agent on Router A. The DHCP relay agent enables DHCP clients to obtain IP addresses and other configuration parameters from the DHCP server on another subnet.

Because the DHCP relay agent and server are on different subnets, you need to configure static or dynamic routing to make them reachable to each other.

DHCP server configuration is also required to guarantee the client-server communication through the DHCP relay agent. For DHCP server configuration information, see "DHCP server configuration examples."

# Specify IP addresses for the interfaces. (Details not shown.)

# Enable DHCP.

<RouterA> system-view
[RouterA] dhcp enable

# Enable the DHCP relay agent on GigabitEthernet 1/0/1.

[RouterA] interface gigabitethernet 1/0/1
[RouterA-GigabitEthernet1/0/1] dhcp select relay

# Specify the IP address of the DHCP server on the relay agent.

[RouterA-GigabitEthernet1/0/1] dhcp relay server-address 10.1.1.1

# Verify that DHCP clients can obtain IP addresses and all other network parameters from the DHCP server through the DHCP relay agent. (Details not shown.)

# Display the statistics of DHCP packets forwarded by the DHCP relay agent.

[RouterA] display dhcp relay statistics

# Display relay entries if you have enabled relay entry recording on the DHCP relay agent.

[RouterA] display dhcp relay client-information