I want to upgrade my IOS but want to allow the original IOS to boot if the new IOS fails.
How can I do that?
The current IOS is located in disk0: and the config has a line "boot system flash disk0:" and my plan was to TFTP the new IOS to disk0: and leaving the origianl IOS and then enter the commands as follows:
no boot system flash disk0:
boot system flash disk:0/s72033-adventerprisek9_wan-mz.122-33.SXH7.bin
Would this allow my new IOS to boot and if the new IOS failed would the original IOS boot?