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5.2 | |
Managing the Cisco File System | |
| 5.2.8 | |
File system verification |
There are several commands that can be
used to verify the router file system. One of those is the
show version
command. 
The show version
command can be used to check the current image and the total amount of
flash. It
also verifies two other items concerning loading the IOS. It
identifies the source of the IOS image that the router used to boot
and displays the configuration register. The boot field setting of the
configuration register can be examined to determine from where the
router is to load the IOS. If these do not agree, there may be a
corrupt or missing IOS image in flash or there may be boot system
commands in the startup configuration.The
show flash
command can also be used to verify the file system.
As previously mentioned, the configuration file may contain boot system commands. These commands can be used to identify the source of the desired IOS boot image. Multiple boot system commands may be used to create a fallback sequence to discover and load an IOS. These boot system commands will be processed in the order of their appearance in the configuration file.
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This
command is used to identify IOS image(s) in flash as well as the
amount of flash that is available. This command is often used to
confirm that there is ample space to store a new IOS image.