> 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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