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Flahing a router

N

Nutz

Senior member
I tried to flash my 2501 to a new IOS images. Here was the results



<< [OK - 7432656/8388608 bytes]

COPY: Text checksum verification failure

TFTP from 192.168.0.1 failed/aborted

Verifying checksum... invalid (expected 0x85DB, computed 0x83DD)
Flash copy took 0:04:20 [hh:mm:ss] >>



Its an 6MB file and I've got 8MB Flash/16MB DRAM. Its liscenced for IP and the image is IP. I backed up the original to pumpkin tftp server and can restore just fine, but these new images always crap out on me when doing the verification checksum. What gives?
 
sounds like that image doesn't run on the 2501! either that or you're doing something wrong while downloading; are you setting your FTP client to 'binary' mode when downloading? looks like it's getting through a good chunk of it before crapping out, though. could be an issue with your router..
 
Got it from a "source" (and we'll leave it at that). Then the images were copied to my system from a burned cd.

Anyways, the router is liscenced for IP, the IOS is IP, and I have enough FLASH RAM. You'd think it would work. The cisco documentation on their site says this will work on the 2500's. I've tried three different IOS versions with all the same results. The only one that works is the one I orginially had and backed-up. I've already tried Pumpkin and Cisco's tftp servers and I'm about to try the solarnets version. I seriously doubt its the tftp server at this point. Guess I'll have to wait until my CCO connection is back to work in a couple weeks so I can try downloading the image myself.
 
You've got enough flash and memory. The checksum failure indicates that the image you have is either corrupt at source or has been corrupted during the transfer. What is the image name? That will tell you whether it is pukka 2500 IOS or not.
 
Lets see, IIRC the image name is c2500-i-l.120-7.bin

The README file wasn't provided with the image. I'll take a look at the attibutes later. I'd think those wouldn't matter since I'm only reading it for a file copy and not a transfer.
 
On 2500 series routers the image is always read only. The upgrade process involves you setting a default static rtoute which the router takes as a last resort. When you invike the upgrade the router will reboot and use an IOS subset from ROM. The 2500 series box's run IOS from flash bthus they can't afford for it to be overwritten, hence the boot to ROM in the upgrade process. When the box has booted from ROM it will attempt to find the TFTP server you specified in the copy tftp flash command. As it's only an IOS subset in ROM only part of ythe config is understood. Specifically routing is limited to understanding the default thus you must have it configured (unless the tftp server is on the same LAN).

Having written all of that you problem is still a corrupt image.
 


<< . Specifically routing is limited to understanding the default thus you must have it configured (unless the tftp server is on the same LAN).

Having written all of that you problem is still a corrupt image. >>



Since the tftp server is sitting on the same wire/network as the ethernet port, I suspect my fears are confirmed. It looks like its a bad image after all.
 
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