Displaying And Maintaining Dhcp Snooping; Dhcp Snooping Configuration Example - 3Com 7757 Configuration Manual

632 C 59: DHCP S
HAPTER
Displaying and
Maintaining DHCP
Snooping
DHCP Snooping
Configuration
Example
DHCP Snooping Trusted
Port Configuration
Example
C
NOOPING ONFIGURATION
Table 505 Configure IP filtering
Operation
Create a static binding
n
Enable DHCP snooping and specify trusted ports on the switch before
■
configuring IP filtering.
You are not recommended to configure IP filtering on the ports of an
■
aggregation group.
After the above configuration, execute the display command in any view to
display and verify the DHCP snooping configuration.
Execute the reset command in user view to clear the IP-MAC mappings recorded
by the DHCP-Snooping-enabled switch.
Table 506 Display and maintain DHCP snooping configuration
Operation
Display the IP-MAC mappings
recorded by the
DHCP-Snooping-enabled switch
Display DHCP-Snooping status and
trusted port information
Display the total number of
DHCP-Snooping binding table entries
Display the DHCP-Snooping binding
table entries of the specified VLAN
Display IP static binding table entries
Clear the IP-MAC mappings recorded
by the DHCP-Snooping-enabled
switch
Network requirements
As shown in Figure 163, the Ethernet 2/0/1 port of Switch A is connected to
Switch B (acting as a DHCP relay agent). A network segment containing some
DHCP clients is connect to the Ethernet 2/0/2 port of Switch A.
The DHCP snooping function is enabled on Switch A.
■
The DHCP-Snooping-enabled device supports option 82 and option 82 is
■
enabled on the switch.
The Ethernet 2/0/1 port of Switch A is a trusted port.
■
Command
ip source static binding
ip-address ip-address
[ mac-address mac-address ]
Command
display dhcp-snooping
display dhcp-snooping trust
display dhcp-snooping count
display dhcp-snooping
vlan { vlan-list | all }
display ip source static binding
[ vlan vlan-id | interface
interface-type interface-number ]
reset dhcp-snooping [ ip-address ] You can
Description
Optional
By default, no static binding
entry is created.
Description
You can
execute the
display
command in
any view.
execute the
reset command
in user view.