3Com MSR 50-40 ROUTER. Installation Manual page 57

Configuration file
The file stores configuration information of the router.
By default, the system defines and attempts to boot in order with three configuration files: main, backup,
and default, provided they are available with CF card. If the router fails to boot with the secure boot file,
it prompts the boot failure. For more information about the boot files, refer to section "Maintaining
Application Program and Configuration File".
The following table describes the three configuration files.
Table 5-2 Description on the three configuration files
Configuration file
Main configuration file
Backup configuration file
Default configuration file
The configuration files for system boot can be type M, B and default configuration file of type N, but
not non-default configuration file of type N (i.e. neither M nor B).
You can modify the file name of a configuration file in CF card using the command after it boots.
You cannot modify the type of the default configuration file, but you can modify the file type of type
M/B and N configuration files in the BootROM menu or using commands after the application
program boots.
You can store them in Flash memory, but only one for each. For example, if an M+B file exists, it is
impossible to have another M or B file. If you change the file type of another file to B, the M+B file
becomes a type M file.
File type
M Used by the system for booting by default.
Used by the system for booting when it fails to boot
B
with the main configuration file.
Used by the system for booting when it fails to boot
with the backup configuration file. If the system fails to
boot with the default configuration file, it boots with
null configuration. The name of the default
M/B/N
configuration file has something to do with the router
brand. The main and backup configuration operations
on the default configuration file is the same with
common configuration files.
5-2
Description