With authentication enabled, you must enter a user name and password to access Privileged EXEC command mode from User-EXEC command mode. The user name and password is the same user name and password you used to Telnet or SSH to the switch.
Note
When you enable authentication for the Privileged EXEC CLI command mode, the changes do not affect existing CLI sessions. For the changes to take effect, you must first log out from your current CLI session and log back in on a new session.