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Software Maintenance under v 3.11 Environment 57
3 Set the type of the application image file to change the type of a boot file
or order in which the boot files are selected.
The dual image function is available with the router. By default, the
system defines and attempts to boot in order with three boot files: main,
backup, and secure, provided they are available from Flash memory. If the
router fails to boot with the secure boot file, it prompts the boot failure.
The following table gives default names and types of the boot files.
Note that:
The application images for system boot can be type M, B and S, but not
type N/A. 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.
You can modify the file name of an application image in Flash memory
using the command after it boots.
You cannot modify the file type of the type S application image file, but
you can modify the file type of type M/B and N/A application image files
in the Boot ROM menu or using commands after the application image
boots.
Secure boot file is the last resort for system boot. You can download it in
the Boot ROM menu and must name it secure.bin. However, you cannot
modify this file or change the type of another file to S. If you change the
name of the secure boot file with the rename command after the system
boots, the file is removed from Flash memory. To use the secure boot file
after that, you need to download it again.
Select <3> in Boot Menu. The console screen displays the following
menu, provided four application image files have existed in Flash
memory:
Table 19 Default names and types of the boot files
Boot file File name File type
Main boot file main.bin M
Backup boot file backup.bin B
Secure boot file secure.bin S