Corrupted IOS Images??
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Posted by on April 20, 2006, 5:11 pm
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I'm trying to upgrade a 3640 from 12.2(16). I've tried downloading 2 different versions of the IOS (12.3(18), 12.2(34)) and can't get them to load. When the router boots, it gives me one of two errors depending on the software version. It's either: "Uncompressed image checksum is incorrect" or "Pre and post compression image sizes disagree" and then it goes into rommon. However, when I copy the original IOS on to the router from my laptop, this IOS boots! I TFTP'd this from the router a few years ago when I bought it. I'm getting the .bin images from cisco.com using the normal method of downloading from their website. I'd suspect bad memory (the router has 128 MB) but the original image that works is actually larger than the other two versions I've tried. I'm using TFTP when I have a working image in the router and xmodem when I don't. Any ideas? Could I be corrupting all these images somehow?? Could it still be bad memory? I assume this is a 3640 and not a 3640A. How can I tell? Any help is appreciated. -Stacy | ||||||||||||||||||||||
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Posted by Christoph Gartmann on April 21, 2006, 3:57 am
Please log in for more thread options  for your troubles is that the images get corrupted along the way from Cisco's webpages to your router. Thus, what steps do you perform to get the image to the router? If the new images are smaller, this is very unlikely. sho version sho inventory sho diag Regards, Christoph Gartmann -- Max-Planck-Institut fuer Phone : +49-761-5108-464 Fax: -452 Immunbiologie Postfach 1169 Internet: gartmann@immunbio dot mpg dot de D-79011 Freiburg, Germany http://www.immunbio.mpg.de/home/menue.html | ||||||||||||||||||||||
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Posted by on April 21, 2006, 5:03 pm
Please log in for more thread options Hi Crishoph,Thank you for your help. I am using TFTP to get the images to the router when I'm not in ROMMON. Otherwise, I'm using xmodem with the console cable. I'm downloading the images from Cisco's website after using the software selector utility using IE on a Win 2003 machine. Then I use Hyperterm to connect to the router. I'm in the process of loading the original image back on so I can do a sho ver & verify that it's a 3640 and not a 3640A. FYI, I took a tip and got an MD5 checker. The checksum from Cisco matches the file I downloaded so I'm not sure that the file is corrupt. -Stacy | ||||||||||||||||||||||
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Posted by Merv on April 21, 2006, 5:13 am
Please log in for more thread options on the CCO download site various checksums for each file are shown.for example there is a MD5 checksum. download an MD5 checksum verifier for Windows and check that the MD5 checksum for the .bin that you downloaded matches what is shown on the CCO site for that file. | ||||||||||||||||||||||
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Posted by on April 21, 2006, 5:04 pm
Please log in for more thread options Thanks! I followed your advice and downloaded an MD5 checker. I hadprinted out the checksum pages before I downloaded the software. The checksums do match. -Stacy | ||||||||||||||||||||||
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>different versions of the IOS (12.3(18), 12.2(34)) and can't get them
>to load.
>When the router boots, it gives me one of two errors depending on the
>software version. It's either:
>"Uncompressed image checksum is incorrect" or
>"Pre and post compression image sizes disagree"
>and then it goes into rommon.
>However, when I copy the original IOS on to the router from my laptop,
>this IOS boots! I TFTP'd this from the router a few years ago when I
>bought it.
>I'm getting the .bin images from cisco.com using the normal method of
>downloading from their website.
>I'd suspect bad memory (the router has 128 MB) but the original image
>that works is actually larger than the other two versions I've tried.
>I'm using TFTP when I have a working image in the router and xmodem
>when I don't.
>Any ideas? Could I be corrupting all these images somehow??