Cisco Systems OL-6426-02 manual Understanding Command Modes

Appendix A Cisco IOS Software Basic Skills

Understanding Command Modes

You can use the terminal emulation software to change settings for the type of device that is connected to the PC, in this case a router. Configure the software to the following standard VT-100 emulation settings so that your PC can communicate with your router:

•9600 baud

•8 data bits

•No parity

•1 stop bit

•No flow control

These settings should match the default settings of your router. To change the router baud, data bits, parity, or stop bits settings, you must reconfigure parameters in the ROM monitor. For more information, see Appendix C, “ROM Monitor.” To change the router flow control setting, use the flowcontrol line configuration command.

For information on how to enter global configuration mode so that you can configure your router, see the “Entering Global Configuration Mode” section later in this chapter.

Understanding Command Modes

This section describes the Cisco IOS command mode structure. Each command mode supports specific Cisco IOS commands. For example, you can use the interface type number command only from global configuration mode.

The following Cisco IOS command modes are hierarchical. When you begin a router session, you are in user EXEC mode.

•User EXEC

•Privileged EXEC

•Global configuration

Table A-2lists the command modes that are used in this guide, how to access each mode, the prompt you see in that mode, and how to exit to a mode or enter the next mode. Because each mode configures different router elements, you might need to enter and exit modes frequently. You can see a list of available commands for a particular mode by entering a question mark (?) at the prompt. For a description of each command, including syntax, see the Cisco IOS 12.3 documentation set.

Cisco 1800 Series Integrated Services Routers (Fixed) Software Configuration Guide

A-2 OL-6426-02