I must upgrade IOS on a cisco 3750.
There is not enough room in the flash for 2 IOS versions, so I have to delete the existing IOS and then download the new one into flash.
Then I have to set the boot variable to boot from the new image.
Here is the question: Do I have to save the config (do a "wr mem") after changing the boot variable and before rebooting the switch to make sure the boot variable is set?
I am asking because I would rather not save the config. I need to disable TACACS so a field tech can get into the switch and actually do the upgrade. Id rather the config return to normal after the reboot without having to re-enable TACACS, change the fallback passwords, etc.