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DES-7200 Configuration Guide Chapter 9 DHCP Snooping Configuration
9-8
when the device restarts due to an electricity failure.
Command Function
DES-7200# configure terminal
Enter the global configuration mode.
DES-7200(config)# [no] ip dhcp snooping
database write-delay [time]
Specify the interval at which the switch writes
the DHCP database to the flash.
time: 600s to 86400s. The default value is 0.
The following example sets the interval at which the switch writes the DHCP databse to the
flash to 3600s:
DES-7200# configure terminal
DES-7200(config)# ip dhcp snooping database write-delay 3600
DES-7200(config)# end
Caution
You need to set a proper time for writing to the flash since erasing and writing
to the flash frequently shortens its life. A shorter time helps to save the device
information more effectively. A longer time reduces the times of writing to the
flash and increases service life of flash.
9.2.7 Writing DHCP
Snooping
Database to
Flash Manually
To prevent loss of DHCP user information when the device restarts due to an electricity failure,
the administrator can write the DHCP Snooping binding database to the flash manually.
Command Function
DES-7200# configure terminal
Enter the global configuration mode.
DES-7200(config)# ip dhcp snooping database
write-to-flash
Write the DHCP Snooping binding database
to the flash manually.
The following example demonstrates how to write the DHCP Snooping binding database to the
flash:
DES-7200# configure terminal
DES-7200(config)# ip dhcp snooping database write-to-flash
DES-7200(config)# end
9.2.8 Configuring a
Port as a
TRUST Port
By default, all the ports are UNTRUST ports. After configuring this command, a port is set as
the TRUST port and connected to the legal DHCP server.
Command Function