Cisco Systems Exploring Main Cisco IOS Command Modes and Cisco Prime in Hyper-V

Chapter 2 Using Cisco IOS XE Software

Understanding the Command Modes

Table 2-2	History Substitution Commands
Command		Purpose
Ctrl-P or the Up Arrow key		Recall commands in the history buffer, beginning with the most
		recent command. Repeat the key sequence to recall successively
		older commands.
Ctrl-N or the Down Arrow key		Return to more recent commands in the history buffer after
		recalling commands with Ctrl-Por the Up Arrow key.
Router# show history		While in EXEC mode, list the last several commands you have just
		entered.

Understanding the Command Modes

The command modes available in the traditional Cisco IOS CLI are exactly the same as the command modes available in Cisco IOS XE.

Use the CLI to access Cisco IOS XE software. Because the CLI is divided into many different modes, the commands available to you at any given time depend on the mode that you are currently in. Entering a question mark (?) at the CLI prompt allows you to obtain a list of commands available for each command mode.

When you log in to the CLI, you are in user EXEC mode. User EXEC mode contains only a limited subset of commands. To have access to all commands, you must enter privileged EXEC mode, normally by using a password. From privileged EXEC mode, you can issue any EXEC command—user or privileged mode—or you can enter global configuration mode. Most EXEC commands are one-time commands. For example, show commands show important status information, and clear commands clear counters or interfaces. The EXEC commands are not saved when the software reboots.

Configuration modes allow you to make changes to the running configuration. If you later save the running configuration to the startup configuration, these changed commands are stored when the software is rebooted. To enter specific configuration modes, you must start at global configuration mode. From global configuration mode, you can enter interface configuration mode and a variety of other modes, such as protocol-specific modes.

Table 2-3describes how to access and exit various common command modes of the Cisco IOS XE software. It also shows examples of the prompts displayed for each mode.

Table 2-3	Accessing and Exiting Command Modes
Command
Mode	Access Method	Prompt	Exit Method
User EXEC	Log in.	Router>	Use the logout command.
Privileged	From user EXEC mode, use the enable EXEC	Router#	To return to user EXEC mode, use
EXEC	command.		the disable command.

Cisco CSR 1000V Series Cloud Services Router Software Configuration Guide

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