Allied Telesis AT-FS970M Series - Manual (Page 475)

AT-FS970M Switch Command Line User’s Guide
475
IP DHCP-RELAY AGENT-OPTION CHECKING
Syntax
ip dhcp-relay agent-option checking
Parameters
None
Mode
Global Configuration Mode
Description
Use this command to configure the DHCP relay agent to discard DHCP
requests that have option 82 information and a null IP address (0.0.0.0) in
the giaddr fields. You may use this feature to protect the network from fake
or suspicious DHCP requests.
Confirmation Command
“SHOW IP DHCP-RELAY” on page 487
Example
This example configures the DHCP relay agent to discard DHCP requests
with option 82 information and a null IP address (0.0.0.0) in the giaddr
fields:
awplus> enable
awplus# configure terminal
awplus(config)# ip dhcp-relay agent-option checking