The NVRAM of the router is a type of memory that retains its contents even
when power is turned off. If the router has a startup con?¬?guration ?¬?le in NVRAM, the usermode
prompt appears after entering the console password, if one has been set.
When starting a new Cisco router, there is no con?¬?guration ?¬?le. If no valid con?¬?guration
?¬?le exists in NVRAM, the operating system executes a question-driven initial con?¬?guration
routine, referred to as the system con?¬?guration dialog, or setup mode.
Setup mode is not intended for entering complex protocol features in the router. Use setup
mode to bring up a minimal con?¬?guration. Rather than using the setup mode, you can use
other various con?¬?guration modes to con?¬?gure the router.
The primary purpose of the setup mode is to rapidly bring up a minimal-feature
con?¬?guration for any router that cannot ?¬?nd its con?¬?guration from some other source. Setup
mode can be entered when the router boots up without a con?¬?guration, or it can be entered
at any time after the router is booted and operational, by entering the setup privileged
EXEC mode command. Example 4-1 shows how to enter setup from the privileged EXEC
mode prompt.
Example 4-1 Entering Setup
Router# sseettuupp
--- System Configuration Dialog ---
Continue with configuration dialog? [yes/no]: yes
At any point you may enter a question mark '?' for help.
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