Cisco ME 3400 Command Reference Manual page 184

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:
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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.
Examples 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
command.
Related Commands Command
ip dhcp snooping
ip dhcp snooping binding
show ip dhcp snooping database
Cisco ME 3400 Ethernet Access Switch Command Reference
2-156
NTP authentication
NTP peer and server associations
NTP broadcast service
NTP access restrictions
NTP packet source IP address
Chapter 2 Cisco ME 3400 Ethernet Access Switch Cisco IOS Commands
Description
Enables DHCP snooping on a VLAN.
Configures the DHCP snooping binding database.
Displays the status of DHCP snooping database agent.
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