Cisco Systems IE3010 Enabling the Cisco IOS DHCP Server Database, Enabling the DHCP Snooping Binding Database Agent

21-14
Cisco IE 3010 Switch Software Configuration Guide
OL-23145-01
Chapter 21 Configuring DHCP Features and IP Source Guard Features
Configuring DHCP Snooping
This example shows how to enable DHCP snooping globally and on VLAN 10 and to configure a rate
limit of 100 packets per second on a port:
Switch(config)# ip dhcp snooping
Switch(config)# ip dhcp snooping vlan 10
Switch(config)# ip dhcp snooping information option
Switch(config)# interface gigabitethernet0/1
Switch(config-if)# ip dhcp snooping limit rate 100
Enabling the Cisco IOS DHCP Server Database
For procedures to enable and configure the Cisco IOS DHCP server database, see the “DHCP
Configuration Task List” section in the “Configuring DHCP” chapter of the Cisco IOS IP Configuration
Guide, Release 12.2 from the Cisco.com page under Documentation > Cisco IOS Software > 12.2
Mainline > Configuration Guides.
Enabling the DHCP Snooping Binding Database Agent
Beginning in privileged EXEC mode, follow these steps to enable and configure the DHCP snooping
binding database agent on the switch:
Command Purpose
Step 1 configure terminal Enter global configuration mode.
Step 2 ip dhcp snooping database
{flash:/filename |
ftp://user:password@host/filename |
http://[[username:password]@]{hostna
me | host-ip}[/directory]
/image-name.tar |
rcp://user@host/filename}|
tftp://host/filename
Specify the URL for the database agent or the binding file by using one
of these forms:
• flash:/filename
• ftp://user:password@host/filename
• http://[[username:password]@]{hostname | host-ip}[/directory]
/image-name.tar
• rcp://user@host/filename
• tftp://host/filename
Step 3 ip dhcp snooping database timeout
seconds
Specify (in seconds) how long to wait for the database transfer process to
finish before stopping the process.
The default is 300 seconds. The range is 0 to 86400. Use 0 to define an
infinite duration, which means to continue trying the transfer
indefinitely.
Step 4 ip dhcp snooping database write-delay
seconds
Specify the duration for which the transfer should be dela yed after the
binding database changes. The range is from 15 to 86400 seconds. The
default is 300 seconds (5 minutes).
Step 5 end Return to privileged EXEC mode.
Step 6 ip dhcp snooping binding mac-address
vlan vlan-id ip-address interface
interface-id expiry seconds
(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.
Note Use this command when you are testing or debugging the switch .