Displaying Dhcp Snooping Information; Understanding Ip Source Guard - Cisco Catalyst 2960 Software Configuration Manual

Displaying DHCP Snooping Information

Command
Step 6
ip dhcp snooping binding mac-address
vlan vlan-id ip-address interface
interface-id expiry seconds
Step 7
show ip dhcp snooping database
[detail]
Step 8
copy running-config startup-config
To stop using the database agent and binding files, use the no ip dhcp snooping database global
configuration command. To reset the timeout or delay values, use the ip dhcp snooping database
timeout seconds or the ip dhcp snooping database write-delay seconds global configuration
command.
To clear the statistics of the DHCP snooping binding database agent, use the clear ip dhcp snooping
database statistics privileged EXEC command. To renew the database, use the renew ip dhcp snooping
database privileged EXEC command.
To delete binding entries from the DHCP snooping binding database, use the no ip dhcp snooping
binding mac-address vlan vlan-id ip-address interface interface-id privileged EXEC command. Enter
this command for each entry that you want to delete.
Displaying DHCP Snooping Information
To display the DHCP snooping information, use the privileged EXEC commands in
Table 20-2 Commands for Displaying DHCP Information
Command
show ip dhcp snooping
show ip dhcp snooping binding
show ip dhcp snooping database
show ip dhcp snooping statistics
If DHCP snooping is enabled and an interface changes to the down state, the switch does not delete the
Note
statically configured bindings.

Understanding IP Source Guard

Note To use the IP source guard feature, the switch must be running the LAN Base image.
Catalyst 2960 and 2960-S Switches Software Configuration Guide, Release 15.0(1)SE
20-12
Purpose
(Optional) Add binding entries to the DHCP snooping binding database.
The vlan-id range is from 1 to 4904. The seconds range is from
1 to 4294967295.
Enter this command for each entry that you add.
Use this command when you are testing or debugging the switch.
Note
Display the status and statistics of the DHCP snooping binding database
agent.
(Optional) Save your entries in the configuration file.
Purpose
Displays the DHCP snooping configuration for a switch
Displays only the dynamically configured bindings in the DHCP snooping binding
database, also referred to as a binding table.
Displays the DHCP snooping binding database status and statistics.
Displays the DHCP snooping statistics in summary or detail form.
Chapter 20 Configuring DHCP and IP Source Guard Features
Table 20-2:
OL-26520-01