Cisco Systems 3825 Understanding Command Modes, Configure terminal, Ctrl-Z, As interface serial

Chapter 2 Cisco IOS Software Basics

Understanding Command Modes

Understanding Command Modes

The Cisco IOS user interface is used in various command modes. Each command mode permits you to configure different components on your router. The commands available at any given time depend on which command mode you are in. Entering a question mark (?) at a prompt displays a list of commands available for that command mode. Table 2-1lists the most common command modes.

Table 2-1	Common Command Modes
			Router Prompt
Command Mode		Access Method	Displayed	Exit Method
User EXEC		Log in.	Router>	Use the logout command.
Privileged EXEC		From user EXEC mode,	Router#	To exit to user EXEC
		enter the enable		mode, use the disable,
		command.		exit, or logout command.
Global configuration		From the privileged	Router (config)#	To exit to privileged
		EXEC mode, enter the		EXEC mode, use the exit
		configure terminal		or end command, or press
		command.		Ctrl-Z.
Interface configuration		From the global	Router (config-if)#	To exit to global
		configuration mode,		configuration mode, use
		enter the interface type		the exit command.
		number command, such		To exit directly to
		as interface serial
				privileged EXEC mode,
		0/0/0.
				press Ctrl-Z.

Timesaver Each command mode restricts you to a subset of commands. If you have trouble entering a command, check the prompt and enter the question mark (?) to see a list of available commands. You might be in the wrong command mode or be using an incorrect syntax.

In the following example, notice how the prompt changes after each command to indicate a new command mode:

Router> enable

Password: <enable password>

Router# configure terminal

Router (config)# interface serial 0/0/0 Router (config-if)# line 0

Router (config-line)# controller t1 0 Router (config-controller)# exit Router (config)# exit

Router#

%SYS-5-CONFIG_I: Configured from console by console

The last message is normal and does not indicate an error. Press Return to get the Router# prompt.

Note You can press Ctrl-Zin any mode to immediately return to enable mode (Router#), instead of entering exit, which returns you to the previous mode.

Cisco 3825 Mobile Wireless Edge Router Software Configuration Guide

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