Friday, June 14, 2013
Cisco Router: IOS 15 Upgrade Gone Bad
Well, this was a surprise to me. I had a router with the IOS of 15.1.?? (I dont recall exactly which is was), but I needed to overcome a NAT problem in particular that I thought was an IOS bug. So, I did an upgrade to version c2900-universalk9-mz.SPA.153-2.T.bin. To my surprise, once I tftp'ed the .bin file, put in the boot sys flash:c2900-universalk9-mz.SPA.153-2.T.bin statement, and typed reload, the router booted up to the initial configuration prompt. WOW. I was not expecting that. Im not sure what happened exactly, but I quickly tftp'ed the 'sh run' I had taken before and got them up quickly. Very surprising. I dont think that is normal, but I at least wanted to share the experience with you all.
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Check the config register and make sure it was not set to ignore the startup config . Register should normally be 0x2101 or x2102 . if its something other than that it may be ignoring the startup config. Possibly because it was changed at one time for password recovery.
ReplyDeleteYeah, I put this router in about a month ago or so. I think out should have come by default as 0x2102. I thinkI had also rebooted this router in the past. Good comments though.
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