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Backing Up and Restoring the Cisco IOS
Before you upgrade or restore a Cisco IOS, you really should copy the existing file to a TFTP
host as a backup just in case the new image crashes and burns.
And you can use any TFTP host to accomplish this. By default, the flash memory in a router
is used to store the Cisco IOS.
before you back up an IOS image to a network server on your intranet, you’ve got to
do these three things:
- Make sure you can access the network server.
- Ensure that the network server has adequate space for the code image.
- Verify the file naming and path requirement.
And if you have a laptop or workstation’s Ethernet port directly connected to a router’s
Ethernet interface, you need to verify the following before attempting
to copy the image to or from the router:
- TFTP server software must be running on the administrator’s workstation.
- The Ethernet connection between the router and the workstation must be made with a
crossover cable.
- The workstation must be on the same subnet as the router’s Ethernet interface.
- The copy flash tftp command must be supplied the IP address of the workstation if
you are copying from the router flash.
- And if you’re copying “into” flash, you need to verify that there’s enough room in flash
memory to accommodate the file to be copied.
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