Actually, I had this exact same thing happen about a month-and-a-half ago. I
tried exactly what it says below and received an invalid checksum on the new
images I downloaded as well. What finally resolved the issue (although I
have no idea how) was that I opened up the router and reseated the flash.
Although it appeared to be seated to begin with it helped as the next file I
uploaded (which was the same one I tried before) worked great!
Cheers
Adam Hickey
CCNA MCP
[EMAIL PROTECTED]
> -----Original Message-----
> From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of
> Paul Werner
> Sent: Friday, October 13, 2000 12:56 PM
> To: [EMAIL PROTECTED]
> Subject: Re: Router in (boot) mode
>
>
> > I have done a show flash and noticed after the file is listed
> it shows [invalid checksum]
> >
> > This is a wierd one. The file is not too big for the flash,
> and this was working a few weeks ago. This is why I am coming
> to the assumption that the flash file may be corrupted. I have
> promted a reload and this same condition results. I am going
> to power cycle which I feel is not going to fix anything. I am
> wondering if a netboot from another source would fix this
> issue, but I'm still not sure of the exact problem? Anyone have
> any advice or knowledge they would like to impart on me?<
>
> This is more detail than previously mentioned, which leads to a
> different course of action. First, you have a corrupted image
> on your flash, which needs to be replaced(the image, that is).
> Generally, this can be accomplished by the following steps:
>
> 1. Place a TFTP server with the valid image and necessary
> permissions and proper IP address directly connected to an
> Ethernet interface on this router.
>
> 2. Ensure that you have a properly bound IP address on the
> same Ethernet interface from the same subnetwork.
>
> 3. Ping the TFTP server from the router. If it doesn't work,
> check to make sure you did a "no shut" at interface
> configuraion mode for the router. Once the ping works, go to
> the next step.
>
> 4. At priviledged mode on the router, execute the following
> command:
>
> copy tftp flash <CR>
>
> It will then prompt you for the following:
>
> Address or name of remote host []? Enter the TFTP server IP
> address
>
> Source filename []? This will be the valid IOS image name on
> your TFTP server, such as, "c2500-js-l_120-3.bin"
>
> Destination filename [c2500-js-l_120-3.bin]? Just press <CR>
>
> At this point, a copy operation should commence.
>
> The real issue is why your image got corrupted in the first
> place. That is one area you have not resolved. Assuming that
> somebody did not recently replace the software image, it may
> have been an isolated incident. OTOH, you will need to monitor
> this router to see if there is a repeat occurrence. If there
> is, you may have corrupted flash. Flash does have a finite
> life on write operations. It is electrically erasable
> programmable read only memory and is subject to a relatively
> short life. Flash can also be damaged by dropping/mishandling
> as well. If it happens again, you may need to replace the
> flash SIMMs or PC card flash.
>
> HTH,
>
> Paul Werner
>
>
>
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