I would like to shut down a switchport if the attached host generates a DHCP request.
I want to discourage users from connecting network devices (e.g. SmartPhones) via the PC USB port. The PCs have fixed IP addresses so they should never use DHCP. When they plug in certain (unauthorised) devices to their USB ports, the device generates a DHCP request, but using the MAC address of the PC (so it is no good using port-security).
Catalyst 4500 running 12.2(25)EWA.