Corrupted IOS Images??

Guest · Posted: Fri Apr 21, 2006 1:11 am Post subject: Corrupted IOS Images??

Hi,

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

Christoph Gartmann · Guest

In article <1145567473.446917.275030@g10g2000cwb.googlegroups.com>, ssherman68@gmail.com writes:

Merv · Guest

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.

Guest · Posted: Sat Apr 22, 2006 1:03 am Post subject: Re: Corrupted IOS Images??

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

Guest · Posted: Sat Apr 22, 2006 1:04 am Post subject: Re: Corrupted IOS Images??

Thanks! I followed your advice and downloaded an MD5 checker. I had
printed out the checksum pages before I downloaded the software. The
checksums do match.

-Stacy

none · Guest

On Thu, 20 Apr 2006 14:11:13 -0700, ssherman68 wrote:

Peter · Guest

Hi Stacy,

Andrew · Guest

Stacy,

Can you provide the following.

The full IOS name that works.
The full IOS name that doesn't work.
and an output of show ver?

Guest · Posted: Tue Apr 25, 2006 3:25 am Post subject: Re: Corrupted IOS Images??

Hi Peter,

Hmmm, I haven't tried uploading it under a different name. I guess I
could see what that does.

I've tried both xmodem from ROMMON and TFTP when I have a working
image. Neither works. I'm using Wierd solutions TFTP Desktop (I've
used the 3Com one in the past too).

Neither image is 16 MB the one that works is 11 MB. The ones that
don't are around 7 to 8 MB and the MD5 checksums are OK.

-Stacy

Guest · Posted: Tue Apr 25, 2006 3:31 am Post subject: Re: Corrupted IOS Images??

Hi Andrew,

Thanks for the help, the IOS that works is c3640-is-mz.122-16.bin

IOS that do not work: c3640-is-mz.122.34.bin, c3640-is-mz.122.32.bin &
c3640-i-mz.123.18.bin

I'm mostly trying to get the latter to work. The only thing I need on
this router is straight IP and BGP so I don't think we need the 'is'
versions.

Here is the show ver:

show ver
Cisco Internetwork Operating System Software
IOS (tm) 3600 Software (C3640-IS-M), Version 12.2(16), RELEASE SOFTWARE
(fc3)
Copyright (c) 1986-2003 by cisco Systems, Inc.
Compiled Thu 06-Mar-03 20:28 by pwade
Image text-base: 0x60008930, data-base: 0x6112C000

ROM: System Bootstrap, Version 11.1(20)AA2, EARLY DEPLOYMENT RELEASE
SOFTWARE (fc1)

BDB-GW uptime is 2 minutes
System returned to ROM by power-on
System restarted at 00:00:00 utc Mon Mar 1 1993
Running default software

cisco 3640 (R4700) processor (revision 0x00) with 98304K/32768K bytes
of memory.
Processor board ID 15896889
R4700 CPU at 100Mhz, Implementation 33, Rev 1.0
Bridging software.
X.25 software, Version 3.0.0.
SuperLAT software (copyright 1990 by Meridian Technology Corp).
1 Ethernet/IEEE 802.3 interface(s)
2 Serial network interface(s)
DRAM configuration is 64 bits wide with parity disabled.
125K bytes of non-volatile configuration memory.
16384K bytes of processor board System flash (Read/Write)

Configuration register is 0x3920

-Stacy

Merv · Guest

The config register should be 0x2102

Merv · Guest

where are you loading the new image to ?

flash or a PCMCIA card ?

If flash are you deleteing the current image and erasing the flash
memory before trying to load new image ?

Guest · Posted: Tue Apr 25, 2006 11:50 pm Post subject: Re: Corrupted IOS Images??

Re: the config register. It's set that way because I have the console
baud rate set to 115,200 so I can xmodem a new image in much less time.

I'm loading to flash. Yes, when I load the new image, it automatically
erases the flash (there's not enough room otherwise).

I'm wondering if PCMCIA would change my luck. I don't have a card.
Will IOS load from a PC card?

I also tried yet another image after going through the software advisor
and no luck. The memory requirements for that one were less than what
I had so it's not that.

-Stacy

Merv · Guest

I would increase the flash memory so the oruter will hold two images.

That way you can tftp an new image in without removing the current image