Uploading IOS - 'tar checksum error'

Unanswered Question
Jun 21st, 2007
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Hi, I am trying to upload an IOS image onto a 3750 switch, but receive this error:


examining image...

%Tar checksum error in tftp://14.x.x.x/c3750-ipbasek9-mz.122-37.SE.bin

%Error opening flash:update/info (No such file or directory)

ERROR: Image is not a valid IOS image archive.


Can anyone help here?

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guruprasadr Thu, 06/21/2007 - 02:00
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TRY THIS: In order to troubleshoot:

1. Check the physical connectivity to the TFTP server.

2. Check the command syntax and IOS file name.

3. Check the TFTP server settings.

4. Try with another TFTP server.

Pls Rate if Helps

Best Regards,

Guru Prasad R

scottmac Thu, 06/21/2007 - 08:36
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When you downloaded the file, did you use ftp? If you used ftp, did you remember to set it to "BIN" mode (default is ASCII for many clients).

For many TFTP servers, once you define the directory holding the files (in the TFTP server's config file), it becomes the root directory for the client.

It may be that you really want to use the "archive" command (from priviledged mode, on the target switch), which will pull the files from the tarball via TFTP and put them where they belong on your switch.

So, what did you do / try already? Save us some guessing time ...

Good Luck


cisco-pix Thu, 06/21/2007 - 12:57
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I used good old copy tftp flash and it worked just fine!


martijn.jansen Fri, 05/06/2011 - 04:54
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The reason for this error message is that the archive command is for the .tar files and cannot be used with .bin files. In order to upgrade using the .bin file, use the copy command



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