Verifying Cisco IOS Image
Follow the below steps to verify the integrity of the IOS software on Cisco IOS routers. Confirm the current IOS image the router is using to boot. router#show version <omited> System image file is “flash0:c3900-universalk9-mz.SPA.153-2.T.bin” <omited> Log into Cisco website and find the IOS image. Mouse over to get the MD5 checksum Issue verify command …