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Chapter 7
Managing a Cisco Internetwork
Before you backup an IOS image to a network server, complete the
following:
Make sure you can access the network server.
Ensure the network server has adequate space for the code image.
Verify the file naming and path requirement.
Verifying Flash Memory
Before you attempt to upgrade the Cisco IOS on your router with a new IOS
file, you should verify that your flash memory has enough room to hold the
new image. You can verify the amount of flash memory and the file or files
being stored in flash memory by using the show flash command (sh flash
for short):
Router#sh flash
System flash directory:
File Length Name/status
1 8121000 c2500-js-l.112-18.bin
[8121064 bytes used, 8656152 available, 16777216 total]
16384K bytes of processor board System flash (Read ONLY)
Router#
Notice that the filename in this example is c2500-js-l.112-18.bin.
The name of the file is platform-specific and is derived as follows:
c2500
is the platform.
j
indicates that the file is an enterprise image.
s
indicates the file contains extended capabilities.
l
indicates that the file can be moved from flash memory if needed and
is not compressed.
11.2-18
is the revision number.
.bin
indicates that the Cisco IOS is a binary executable file.
The last line in the router output shows that the flash is 16,384KB (or
16MB). So if the new file that you want to use is, say, 10MB in size, you know
that there is plenty of room for it. Once you verify that flash memory can hold
the IOS you want to copy, you can continue with your backup operation.
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