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New Member

Boot order when using multiple IOS Images

Okay, simple question:

I have slot0 with two images, disk0 with one image, both flashes in the same router, a 7204-VXR. If the boot system command is not specified pointing to a particular image, which image will be used to start the router? What is the deciding factor in the boot order?

I can't find a single thing on CCO relating to this ordering process.

Thanks, Jeff


Re: Boot order when using multiple IOS Images

It depends a bit on the router. Usually whatever is the first boot device (bootflash?) and whatever is the first image on that device is loaded first.

However, the easy way to set the boot order is to do a multiple "boot system flash" commands. Whatever order they are in your configuration is the order they're tried in. Be sure to put them into the config in the order you wanted them to be, there is not way to reorder them beyond doing a "no boot ..." on each line that is out of order and putting it back in the right order...


boot system flash disk0:c7200-is-mz.123-1a.bin

boot system flash disk0:c7200-is-mz.123-5b.bin

would first try booting the 12.3(1a), then the 12.3(5b) if the first failed.

to find out the order they're in, its easiest to do a:

sh run | i boot

Hope this helps...

New Member

Re: Boot order when using multiple IOS Images

'preciate the response, but no it doesn't help.

I know all about the boot commands, but just have never really tried to nail down an unordered boot process before.

Thanks, Jeff