System Configuration Dialog
If the router hasn’t been previously configured, or if the configuration has been erased, the Cisco IOS automatically runs the setup command when the router is turned on or reloaded.
The setup command launches the System Configuration Dialog.
This prompts you for a host name for the router, some password configuration information, protocol configuration, and routing protocol selection (RIP and IGRP).
When complete, the router will run through its typical startup and configuration process.
At this point, the router will be operational but the configuration will in no way be complete.