Booting from TFTP

Unanswered Question
Nov 14th, 2008

Hi friends, I Have a Catalyst 6509 with a SUP720-3B.

I have nor enough space on my flash card. Is it possible to boot other IOS using TFTP for a test? What could be the correct commands?

Thanks in advance.


I have this problem too.
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Jon Marshall Fri, 11/14/2008 - 05:14


You don't say whether you are running CatOS on the supervisor and IOS on the MSFC (Hybrid) or if you are running IOS on both (Native).

Assuming Native then no you cannot boot from a TFTP server. From a Cisco whitepaper -

Unlike the Cisco Catalyst OS, net booting a Cisco IOS Software image from a TFTP server is not supported because the supervisor image is a bundled image for two processors. The runtime image location (c6sup-is-mz-) must be stored on a device local to the switch processor (sup-bootflash) or the flash card (slot0:, disk0:, disk1:).

Full link -


david-lima Fri, 11/14/2008 - 05:38

Thanks a lot Jon for this information. Please just I want to understand my options, running IOS i don't have any chance but runnig CatOS i do.

Please correct me.

Best regards


jose.solano Fri, 11/14/2008 - 07:48

Yes, there are documents in to do that, but I tried recently do it without positive result.

Good look


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