Cisco VG224 Software Guide - Page 17

Chapter 1 Understanding Interface Numbering and Cisco IOS Software Basics Understanding Cisco IOS Software Basics Understanding Cisco IOS Software Basics This section describes what you need to know about the Cisco IOS software before you configure the router using the command-line interface (CLI). This chapter includes the following: • Getting Help, page 1-3 • Command Modes, page 1-3 • Undoing a Command or Feature, page 1-4 • Saving Configuration Changes, page 1-5 • Where to Go Next, page 1-5 Understanding these concepts will save time as you begin to use the CLI. If you have never used Cisco IOS software or need a refresher, take a few minutes to read this chapter before you proceed to the next chapter. If you are already familiar with Cisco IOS software, proceed to Chapter 2, "Using the setup Command." Getting Help Use the question mark (?) and arrow keys to help you enter commands: • For a list of available commands, enter a question mark: Router> ? • To complete a command, enter a few known characters followed by a question mark (with no space): Router> s? • For a list of command variables, enter the command followed by a space and a question mark: Router> show ? • To redisplay a command you previously entered, press the up arrow key. You can continue to press the up arrow key for more commands. Command Modes The Cisco IOS user interface is divided into different modes. Each command mode permits you to configure different components on your router. The commands available at any given time depend on which mode you are currently in. Entering a question mark (?) at the prompt displays a list of commands available for each command mode. Table 1-1 lists the most common command modes. OL-5005-01 Cisco VG224 Voice Gateway Software Configuration Guide 1-3