Is there a easy way to manage which IOS a router will try to boot first and then if it fails boot to the 2nd image?
Case in point. I upgraded a 1811 router with a newer image. I want to tell the router to use the new image as the primary and reboot, then if it crashes or fails to load that primary image, reboot and load up the second old image that does work.
Normally I would use:
boot system flash:filename.bin
however as far as I have seen in the my experience the router will bootup whatever IOS image it sees first on the flash drive, then it will read the starting-config file and see that I am pointing at a different IOS to boot off of. At which point the router then loads the new IOS.
All of this wastes time as I have to wait for the 1st image to load to get the starting-config read before it does the boot system flash command.
I know I saw on 3500 switches where this isn't the case. Is there a trick for force it on a router to do this? Or am I just crazy and looking at this wrong?