Can SUP720 boot and work with external flash only?

Unanswered Question
Apr 20th, 2007

One of our customers wants to move the internal flash cards of their SUP720 (IOS v12.2(33)SRA1)into slot0 for easy access to the flash cards in case of upgrades and changes.

Can the switch boot from slot0 without internal flash installed? what happens in case of crash? will the dump be written to Slot0 flash? Any other loss of functionality?

rgds, Geert Folens.

I have this problem too.
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eofelt Fri, 04/20/2007 - 04:49


Yes, it is possible.

By default, the router first tries to boot from the first image in the onboard system Flash, if available, and then it tries the PCMCIA Flash cards.

The user may also specify which images or locations to attempt booting from and the order using the boot system command in configuration mode:

IOS(config)# boot system slot0

Here's a great PDF that has some very

good suggestions (and configs) regarding this isssue starting on page 14.

hth, please rate

gfolens Fri, 04/20/2007 - 07:01

Thanks for your reply. but the link with the pdf is not working...

rgds, Geert Folens.

eofelt Tue, 05/01/2007 - 05:54

Thanks and regrets.

If you post an email, I'll will

send the pdf. It's ~577kb.


gfolens Wed, 05/02/2007 - 23:05

Meanwhile I managed to download the doc via the link.


rgds, Geert.


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