3845 IOS upgrade issues

Unanswered Question
Jun 23rd, 2008

Hi All,

I have a 3845 rtr currently running with IOS: flash:c3845-advsecurityk9-mz.124-3d.bin. Iam trying to upgrade the Image to : c3845-advipservicesk9-mz.124-19b , so the BGP will be supported and I can use this as Internet rtr.

I deleted the existing IOS (delete flash: ) to get space and when I try to upload the new image, the TFTP server is giving error: >> 0: File is too big, try increasing the block size.

Please suggest.

Thank you


I have this problem too.
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Paolo Bevilacqua Mon, 06/23/2008 - 08:55

Which TFTP server are you using ? You need one that has no files size limits whatsoever.

mvsheik123 Mon, 06/23/2008 - 09:04

Great..thank you. Using Klever Group PumpKIN TFTP... I just checked and the default block size is 2048.

What is recomended size to avoid the message and for successful IOS uploads..?

Thank you


Paolo Bevilacqua Mon, 06/23/2008 - 09:11

Recommend tftpd32 that is free and easy to use. You can also use an ftp otr http server and in fact it's even faster than the udp-based tftp.

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