I get a lot of hits via Google from people searching for a default username on Cisco router. It's ages-old news, but there is no default username. Period. If you have to get access to a router and cannot remember the password(s), the only thing left is the password recovery mechanism ... although even that can be disabled with the no service password-recovery configuration command.

There are, however, a few things you can do if you want to relax the access to your router in a lab environment (never do it in a production network):

• If you configure no enable password, you can switch to enable mode without supplying a password
• If you want to telnet to a router without supplying a password, configure no login on the vty lines.
• If you want to be in privilege mode immediately after accessing the router, configure privilege level on the console or vty lines.