Displaying And Debugging Dhcp Relay - 3Com 8800 Configuration Manual

3Com Switch 8800 Configuration Guide
Table 13-34 Configure user address entries for DHCP server
Add a user address entry for DHCP
server
Remove a user address entry for DHCP
server
III. Enable/Disable DHCP security on a VLAN interface
If you enable the DHCP security feature on a VLAN interface, the switch performs user
address checking on the VLAN interface to prevent unauthorized binding request. If
you disable the DHCP security feature on a VLAN interface, the switch does not
perform user address checking on the VLAN interface.
Perform the following configuration in VLAN interface view.
Table 13-35 Enable/disable DHCP security on a VLAN interface
Enable DHCP security on a VLAN
interface
Disable DHCP security on a VLAN
interface
DHCP security is disabled on a VLAN interface by default.

13.4.3 Displaying and Debugging DHCP Relay

After the above configuration, you can execute the display command in any view to
display running information about DHCP Relay to verify your configuration.
Execute the debugging command in user view to debug DHCP Relay.
Table 13-36 Display and debug DHCP Relay
Display information about the
DHCP servers configured for
VLAN interface
Display
legal user address entries for
DHCP server
Enable debugging for DHCP
Relay
Operation
Operation
Operation
information about
dhcp relay
mac_address static
undo dhcp relay security ip_address
dhcp relay security address-check
enable
dhcp relay security address-check
disable
Command
display dhcp relay
vlan-interface vlan-id | all }
display dhcprelay-security [ ip_address ]
debugging dhcp relay { all| packet | error |
event }
13-23
Chapter 13 DHCP Configuration
Command
security ip_address
Command
address { interface