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Cisco 12010, Cisco 12410, and Cisco 12810 Router Installation and Configuration Guide
OL-11496-01
Chapter 4 System Startup and Basic System Configuration
Cisco IOS User Interface
You can use the method that suits your operating style and your knowledge of
network configuration requirements.
Whether you use the setup command facility or global configuration mode to
configure the router to operate in your networking environment, be sure you know
the:
• Interfaces the router has.
• Protocols the router is routing.
• Network addresses for the protocols being configured.
• Password scheme for your environment.
Cisco IOS User Interface
Cisco IOS software provides a command line interface that allows you to
configure and manage your router. If you are not familiar with the Cisco IOS
command line interface, you should read the “Using the Command Line
Interface” chapter in the Configuration Fundamentals Configuration Guide. This
section discusses the different command modes, context-sensitive help, and
editing features of the interface.
Cisco IOS User Interface Command Modes
The Cisco IOS user interface is organized into several different modes. The
available commands depend on which mode you are currently in. Entering a
question mark (?) at the system prompt displays a list of commands available for
the current command mode.
When you start a session on the router, you begin in user EXEC mode. Only a
limited subset of the commands are available in EXEC mode. In order to have
access to all of the commands, you must enter privileged EXEC mode which
normally requires a password. From privileged EXEC mode, you can enter any
EXEC command or enter global configuration mode. Most of the EXEC
commands are 1-time commands, such as show commands, that show the current
configuration status, and clear commands, that clear counters or interfaces. The
EXEC commands are not saved across reboots of the router.