Displaying And Maintaining Dhcp Snooping - 3Com S7906E Configuration Manual

You can enable DHCP snooping to support Option 82 on Layer 2 Ethernet interfaces,ONU port
and Layer 2 aggregation interfaces only.
If a Layer 2 Ethernet interface is added to an aggregation group, enabling DHCP snooping to
support Option 82 on the interface will not take effect. After the interface quits the aggregation
group, the configuration will be effective.
To support Option 82, it is required to perform related configuration on both the DHCP server and
the device enabled with DHCP snooping. Refer to
DHCP server configuration of this kind.
If the handling strategy of the DHCP-snooping-enabled device is configured as replace, you need
to configure a padding format for Option 82. If the handling strategy is keep or drop, you need not
configure any padding format.
If the Option 82 is padded with the device name (sysname) of a node, the device name must
contain no spaces. Otherwise, the DHCP-snooping-enabled device will drop the message.

Displaying and Maintaining DHCP Snooping

Display DHCP snooping entries
Display Option 82 configuration
information on the DHCP snooping
device
Display DHCP packet statistics on the
DHCP snooping device (for distributed
devices)
Display DHCP packet statistics on the
DHCP snooping device (for distributed
IRF devices)
Display information about trusted ports
Clear DHCP snooping entries
Clear DHCP packet statistics on the
DHCP snooping device (for distributed
devices)
Clear DHCP packet statistics on the
DHCP snooping device (for distributed
IRF devices)
To do...
Configuring the Handling Mode for Option 82
Use the command...
display dhcp-snooping [ ip
ip-address ]
display dhcp-snooping
information { all | interface
interface-type interface-number }
display dhcp-snooping packet
statistics [ slot slot-number ]
display dhcp-snooping packet
statistics [ chassis
chassis-number slot
slot-number ]
display dhcp-snooping trust
reset dhcp-snooping { all | ip
ip-address }
reset dhcp-snooping packet
statistics [ slot slot-number ]
reset dhcp-snooping packet
statistics [ chassis
chassis-number slot
slot-number ]
5-7
for
Remarks
Available in any view
Available in any view
Available in any view
Available in any view
Available in any view
Available in user view
Available in user view
Available in user view