Cisco ME 3400 Command Reference Manual page 184

Ethernet access switch

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ip dhcp snooping database

Usage Guidelines

The DHCP snooping binding database can have up to 8192 bindings.

To ensure that the lease time in the database is accurate, we recommend that Network Time Protocol

(NTP) is enabled and configured for these features:

If NTP is configured, the switch writes binding changes to the binding file only when the switch system

clock is synchronized with NTP.

Because both NVRAM and the flash memory have limited storage capacity, we recommend that you

store a binding file on a TFTP server. You must create an empty file at the configured URL on

network-based URLs (such as TFTP and FTP) before the switch can write bindings to the binding file at

that URL for the first time.

Use the no ip dhcp snooping database command to disable the agent.

Use the no ip dhcp snooping database timeout command to reset the timeout value.

Use the no ip dhcp snooping database write-delay command to reset the write-delay value.

This example shows how to store a binding file at an IP address of 10.1.1.1 that is in a directory called

directory. A file named file must be present on the TFTP server.

Switch(config)# ip dhcp snooping database tftp://10.1.1.1/directory/file

You can verify your settings by entering the show ip dhcp snooping database privileged EXEC

Related Commands

ip dhcp snooping

ip dhcp snooping binding

show ip dhcp snooping database

Cisco ME 3400 Ethernet Access Switch Command Reference

NTP authentication

NTP peer and server associations

NTP broadcast service

NTP access restrictions

NTP packet source IP address

Cisco ME 3400 Ethernet Access Switch Cisco IOS Commands

Enables DHCP snooping on a VLAN.

Configures the DHCP snooping binding database.

Displays the status of DHCP snooping database agent.