3Com 5500-EI PWR Reference Manual page 56

the system will save the current configuration with the default name (config.cfg) in the root
directory.
The system supports two modes for saving the current configuration file.
Fast saving mode. This is the mode when you use the save command without the safely keyword.
The mode saves the file quicker but is likely to lose the original configuration file if the switch
reboots or the power fails during the process.
Safe mode. This is the mode when you use the save command with the safely keyword. The mode
saves the file slower but can retain the original configuration file in the Flash even if the switch
reboots or the power fails during the process.
When you use the save safely command to save the configuration file, if the switch reboots or the
power fails during the saving process, the switch initializes itself in the following two conditions when it
starts up next time:
If a configuration file with the extension .cfg exists in the Flash, the switch uses the configuration
file to initialize itself when it starts up next time.
If there is no .cfg configuration file in the Flash, but there is a configuration file with the
extension .cfgbak (backup configuration file containing the original configuration information)
or/and a configuration file with the extension .cfgtmp (temporary configuration file containing the
current configuration information) in the Flash, you can change the extension .cfgbak or .cfgtmp
to .cfg using the rename command. The switch will use the renamed configuration file to initialize
itself when it starts up next time.
For details of the rename command, refer to the File System Management part of the manual.
It is recommended to adopt the fast saving mode in the conditions of stable power and adopt the
safe mode in the conditions of unstable power or remote maintenance.
If you use the save command after a fabric is formed on the switch, the units in the fabric save their
own startup configuration files automatically.
The extension name of the configuration file must be .cfg.
Examples
# Save the current configuration to 123.cfg as the main configuration file for the next startup.
<Sysname> save main
The configuration will be written to the device.
Are you sure?[Y/N]y
Please input the file name(*.cfg)(To leave the existing filename
unchanged press the enter key):123.cfg
Now saving current configuration to the device.
Saving configuration. Please wait...
............
Unit1 save configuration flash:/123.cfg successfully
# Save the current configuration to 234.cfg in unit 1.
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