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can't upgrade IOS via tftp on 2821

Answered Question
May 8th, 2006
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I am trying to upgrade a 2821 via tftp to an IOS image that is 34MB. My "old reliable" tftp cannot handle files larger than 16MB so I donwload and tried two other servers. I tried SolarWinds and a server by Whitehorn. In both cases the router begins to download the IOS but it seems to keep going after downloading the IOS's 34MB and it begins the download again. It seems to loop in this manner until the flash is full and then the xfer quits complaing of the full flash! Is this a problem on the router end or should I look for yet another large file capable tftp server?



Correct Answer by spremkumar about 11 years 3 months ago


The best bet for the file transfers ranging more than 16MB would be FTP.

Do find this link which talks about the limitation(bug) in detail..



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Overall Rating: 5 (1 ratings)
DIEGO ALONSO Tue, 05/09/2006 - 03:01
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That doesn't seem to be the issue that I am running into. Reason being that the current IOS is pretty recent. It is an 12.3 IOS and I am not getting the timeout condition. I am actually seeing the opposite whereby the IOS client transfers the IOS image repeatedly until it fills the flash. Nevertheless FTP seems like a good option and I will try it.

Thank you very much.



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