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Thursday, March 11, 2010

Cisco 4507 - Loading new image upon reboot


We have a 4507RE and just copied over a new IOS (cat4500-ipbase-mz.122-31.SGA11.bin). Since the older image is currently loaded, we need to reboot the switch so that the new image can be loaded. What command can we use to instruct the switch to use the new image and not old upon reboot? But we do not want to erase the old image just in case we need to revert back to it.

conf t
no boot system
boot system bootflash:cat4500-ipbase-mz.122-31.SGA11.bin
boot system bootflash:cat4500-ipbase-mz.122-31.SGA6.bin
end
wr
reload
Basically, the commands mean boot SGA11 first. If the IOS fails, boot SGA6.

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