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Catalyst 3750 Metro Switch Command Reference
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Chapter 2 Catalyst 3750 Metro Switch Cisco IOS Commands
ip dhcp snooping database
•
NTP broadcast service
•
NTP access restrictions
•
NTP packet source IP address
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
ip dhcp snooping database flash:/
filename
command to save the DHCP snooping binding
database in the switch NVRAM.
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
This example shows how to store a binding file called file01.txt in the switch NVRAM.
Switch(config)#
ip dhcp snooping database flash:file01.txt
You can verify your settings by entering the
show ip dhcp snooping database
privileged EXEC
command.
Related Commands
Command
Description
Enables DHCP snooping on a VLAN.
Configures the DHCP snooping binding database.
show ip dhcp snooping database
Displays the status of DHCP snooping database agent.
