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Software Configuration Guide For Cisco 2600 Series, Cisco 3600 Series, and Cisco 3700 Series Routers
OL-1957-04
Chapter1 Understanding Interface Numbering and Cisco IOS Software Basics
Understanding Cisco IOS Software Basics
• 1/0/1—Chassis slot 1/Voice module slot 0/Voice interface 1
• 1/1/0—Chassis slot 1/Voice module slot 1/Voice interface 0
• 1/1/1—Chassis slot 1/Voice module slot 1/Voice interface 1
Understanding Cisco IOS Software Basics
This section describes what you need to know about the CiscoIOS software before you configure the
router using the command-line interface (CLI). This chapter includes the following:
• Getting Help, page 1-13
• Understanding Command Modes, page 1-13
• Undoing a Command or Feature, page 1-14
• Saving Configuration Changes, page 1-15
• Where to Go Next, page 1-15
Understanding these concepts will save time as you begin to use the CLI. If you have never used the
CiscoIOS 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 CiscoIOS software, proceed to Chapter2, “Using the Setup Command
Facility.”
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.
Understanding Command Modes
The CiscoIOS 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. Table1-2 lists the most common command modes.
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