Cisco Cisco SG500-52PP 52-port Gigabit Max PoE+ Stackable Managed Switch 技术参考

DHCP Snooping and ARP Inspection Commands

78-21491-01 Command Line Interface Reference Guide

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Use the ip dhcp snooping database Global Configuration mode command to 
enable the DHCP Snooping binding database file. Use the no form of this 
command to delete the DHCP Snooping binding database file.

Syntax

ip dhcp snooping database

no ip dhcp snooping database

Parameters

N/A

Default Configuration

The DHCP Snooping binding database file is not defined.

Command Mode 

Global Configuration mode

User Guidelines

The DHCP Snooping binding database file resides on Flash.

To ensure that the lease time in the database is accurate, the Simple Network Time 
Protocol (SNTP) must be enabled and configured.

The device writes binding changes to the binding database file only if the device 
system clock is synchronized with SNTP.

Example

The following example enables the DHCP Snooping binding database file.

Console(config)# 

Use the ip dhcp snooping database update-freq Global Configuration mode 
command to set the update frequency of the DHCP Snooping binding database 
file. Use the no form of this command to restore the default configuration.