I am currently upgrading a WS-C2960-PC-L switch to the latest IOS version, c2960-lanbasek9-mz.122-52.SE.bin. Everytime when I do console login from power off then power on the switch, it will only show the login banner, but no login prompt, then for about 10 seconds later, there were 3 "authentication failed" messages, the login prompt will show it after several enters with several authentication failed messages later. I would say at least 5 minutes later. If I reverted back to older IOS, such as c2960-lanbasek9-mz.122-50.SE3.bin, the then login prompt is normal. I am just wondering if anyone out here have the similar issue, and or how to resolve this problem?
