Is the port to the true DHCP server a “trusted” port?
Using Web GUI:
Figure 12 Advance Application > IP Source Guard > IP Source Guard Setup >
DHCP Snooping > Configure > Port
Using CLI:
Figure 13
If only the port to the true DHCP server is a “trusted” port, go to step 13.
If the port to the true DHCP server is not a “trusted” port, make sure only the port to
the true DHCP server is a “trusted” port and repeat step 10.