Huawei Quidway S6500 Series Operation Manual page 112

Operation Manual - Network Protocol
Quidway S6500 Series Ethernet Switches
Secondly, use the display vlan and display ip interface vlan-interface
commands to check if the VLAN and the corresponding interface IP address have
been configured.
Then make sure to ping the configured DHCP Server to ensure that the link is
connected.
Ping the IP address of the VLAN interface of the switch to which the DHCP user is
connected from the DHCP Server to make sure that the DHCP Server can
correctly find the route of the network segment the user is on. If the ping execution
fails, check if the default gateway of the DHCP Server has been configured as the
address of the VLAN interface that it locates on.
If there is no problem found in the last two steps, use the display dhcp-server
groupNo command to view what packet has been received. If you only see the
Discover packet and there is no response packet, it means the DHCP Server has
not sent the message to the switch. In this case, you shall check if the DHCP
Server has been configured properly. If the numbers of request and response
packets are normal, enable the debugging dhcp-relay in User view and then use
the terminal debugging command output the debugging information to the
console. In this way, you can view the detailed information of all DHCP packets on
the console during applying for the IP address, thereby conveniently locating the
problem.
Huawei Technologies Proprietary
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Chapter 5 DHCP Configuration