This is the retired Shane Killen personal blog, an IT technical blog about configs and topics related to the Network and Security Engineer working with Cisco, Brocade, Check Point, and Palo Alto and Sonicwall. I hope this blog serves you well. -- May The Lord bless you and keep you. May He shine His face upon you, and bring you peace.
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.
Subscribe to: Post Comments (Atom)
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.ReplyDelete
Yeah, 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.Delete