H3C SOHO IE4300, Command Reference Manual

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As a best practice, back up the bindings to a remote file. If you use the local storage medium, the
frequent erasing and writing might damage the medium and then cause the DHCP server to
malfunction.
When the backup file is on a remote device, follow these restrictions and guidelines:
•
If the file is on an FTP server, enter URL in the following format: ftp:// server address:port/file
path , where the port number is optional.
•
If the file is on a TFTP server, enter URL in the following format: tftp:// server address:port/file
path , where the port number is optional.
•
If the IP address of the server is an IPv6 address, enclose the address in a pair of brackets, for
example,
ftp://[1::1]/database.dhcp .
•
You can also specify the DNS domain name for the server address field, for example,
ftp://company/database.dhcp .
Examples
# Configure the DHCP server to back up its bindings to file database.dhcp .
<Sysname> system-view
[Sysname] dhcp server database filename database.dhcp
Related commands
dhcp server database update interval
dhcp server database update now
dhcp server database update stop
dhcp server database update interval
Use dhcp server database update interval to set the waiting time for the DHCP server
to update the backup file after a DHCP binding change.
Use
undo dhcp server database update interval
to restore the default.
Syntax
dhcp server database update interval interval
undo dhcp server database update interval
Default
The DHCP server waits 300 seconds to update the backup file after a DHCP binding change. If no
DHCP binding changes, the backup file is not updated.
Views
System view
Predefined user roles
network-admin
Parameters
interval
: Specifies the waiting time in the range of 60 to 864000 seconds.
Usage guidelines
When a DHCP binding is created, updated, or removed, the waiting period starts. The DHCP server
updates the backup file when the waiting period is reached. All bindings changed during the period
will be saved to the backup file.
The waiting time takes effect only after you configure the DHCP binding auto backup by using the
dhcp server database filename
command.