I had a switch go down recently. In replacing said switch i dropped the config onto the replacement, copied running config to start and reloaded.
However, when it had booted back up, i was unable to connect back onto the switch via the console cable.
Its simply states that Con0 is now available, press return to get started. However when i hit return it flashes Authentication failed and then loops back to Con0 is now available, press return to get started.
I am new to this, but I think the issue might be you might be attempting to have your sw attempt to reach a radius or tacacs for auth (bad for a local console port). You need to set it for local atuh (I believe its 'login local'). I could be totally wrong in my observation though.
We are pleased to announce availability of Beta software for 16.6.3.
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