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# 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.)
# 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
# Enable the DHCP relay agent to handle Option 82, and perform Option 82 related configuration.
[RouterA-GigabitEthernet1/0/1] dhcp relay information enable
[RouterA-GigabitEthernet1/0/1] dhcp relay information strategy replace
[RouterA-GigabitEthernet1/0/1] dhcp relay information circuit-id string company001
[RouterA-GigabitEthernet1/0/1] dhcp relay information remote-id string device001
Troubleshooting DHCP relay agent configuration
Symptom
DHCP clients cannot obtain configuration parameters through the DHCP relay agent.
Analysis
Some problems might occur with the DHCP relay agent or server configuration.
Solution
To locate the problem, enable debugging and execute the display command on the DHCP relay
agent to view the debugging information and interface state information.
Check that:
• DHCP is enabled on the DHCP server and relay agent.
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