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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
example
s."
Figure 32 Network diagram
Configuration procedure
# Specify IP addresses for the interfaces. (Details not shown.)
# Enable DHCP.
<RouterA> system-view
[RouterA] dhcp enable
# Enable the DHCP relay agent on GigabitEthernet 2/0/1.
[RouterA] interface gigabitethernet 2/0/1
[RouterA-GigabitEthernet2/0/1] dhcp select relay
# Specify the IP address of the DHCP server on the relay agent.
[RouterA-GigabitEthernet2/0/1] dhcp relay server-address 10.1.1.1
Verifying the configuration
# 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
Option 82 configuration example
Network requirements
As shown in Figure 32, the DHCP relay agent (Router A) replaces Option 82 in DHCP requests
before forwarding them to the DHCP server (Router B).
• The Circuit ID sub-option is company001.
• The Remote ID sub-option is device001.
To use Option 82, you must also enable the DHCP server to handle Option 82.
Configuration procedure
# Specify IP addresses for the interfaces. (Details not shown.)
Router B
DHCP server
Router A
DHCP relay agent
DHCP client DHCP client
DHCP clientDHCP client
GE2/0/2
10.1.1.2/24
GE2/0/1
10.10.1.1/24
GE2/0/1
10.1.1.1/24
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