H3C H3C S5100-SI, Operation Manual, Page: 354 / 830

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You need to perform corresponding configurations on the DHCP server to enable the DHCP clients
to obtain IP addresses from the DHCP server. The DHCP server configurations vary with different
DHCP server devices, so the configurations are omitted.
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The DHCP relay agent and DHCP server must be reachable to each other.
Troubleshooting DHCP Relay Agent Configuration
Symptom
A client fails to obtain configuration information through a DHCP relay agent.
Analysis
This problem may be caused by improper DHCP relay agent configuration. When a DHCP relay agent
operates improperly, you can locate the problem by enabling debugging and checking the information
about debugging and interface state (You can display the information by executing the corresponding
display command.)
Solution
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Check if an address pool that is on the same network segment with the DHCP clients is configured
on the DHCP server.
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Check if a reachable route is configured between the DHCP relay agent and the DHCP server.
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Check the DHCP relay agent. Check if the correct DHCP server group is configured on the
interface connecting the network segment where the DHCP client resides. Check if the IP address
of the DHCP server group is correct.
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If the address-check enable command is configured on the interface connected to the DHCP
server, verify the DHCP server’s IP-to-MAC address binding entry is configured on the DHCP relay
agent; otherwise the DHCP client cannot obtain an IP address.