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Chapter 4 System Startup and Basic System Configuration
Cisco IOS User Interface
4-18
Cisco 12010, Cisco 12410, and Cisco 12810 Router Installation and Configuration Guide
OL-11496-01
Subinterface Configuration Mode
Use subinterface configuration mode to configure multiple virtual interfaces
(called subinterfaces) on a single physical interface. Subinterfaces appear to be
distinct physical interfaces to the various protocols. For detailed information on
how to configure subinterfaces, refer to the appropriate module for a specific
protocol in the Cisco IOS software documentation.
ROM Monitor Mode
If the router cannot locate a valid system image, or if the boot sequence is
interrupted, the system may enter ROM monitor mode. You can then boot the
system manually or perform diagnostic tests.
You can also enter ROM monitor mode by entering the reload command from the
privileged EXEC mode prompt and then pressing the Break key during the first
60 seconds of startup.
Using Setup for Configuration Changes
Use the setup command facility to perform first-time configuration and other
basic configuration procedures on your router. This facility is based on a script
that prompts you to enter basic configuration information to start a router quickly
and uneventfully.
During the first-time startup of an unconfigured router, the system automatically
starts the setup command facility and displays an interactive dialog called the
system configuration dialog. The system configuration dialog guides you through
the configuration process by prompting you for global (system-wide) parameters
and interface (line card) parameters.