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This chapter gives you a process to follow in configuring your switch router, lists the information you need to have available before you begin, and describes Cisco IOS command modes. This chapter includes the following topics:
Table 2-1 is a suggested procedure for configuring your switch router.
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Before configuring your switch router, have the following information available:
To use the CLI, your terminal must be connected to the switch router through the console port or one of the TTY lines. By default, the terminal is configured to a basic configuration, which should work for most terminal sessions.
The Cisco IOS user interface is divided into many different modes. The commands available to you depend on which mode you are currently in. To get a list of the commands available in a given mode, type a question mark (?) at the system prompt.
When you start a session on the router, you begin in user mode, often called EXEC mode. Only a limited subset of the commands are available in EXEC mode. To have access to all commands, you must enter privileged EXEC mode. Normally, you must type in a password to access privileged EXEC mode. From privileged mode, you can type in any EXEC command or access global configuration mode. Most of the EXEC commands are one-time commands, such as show commands, which show the current configuration status, and clear commands, which clear counters or interfaces. The EXEC commands are not saved across reboots of the router.
The configuration modes allow you to make changes to the running configuration. If you later save the configuration, these commands are stored across router reboots. You must start at global configuration mode. From global configuration mode, you can enter interface configuration mode, subinterface configuration mode, and a variety of protocol-specific modes.
Read only memory (ROM) monitor mode is a separate mode used when the router cannot boot properly. For example, your router or access server might enter read-only memory (ROM) monitor mode if it does not find a valid system image when it is booting, or if its configuration file is corrupted at startup.
Table 2-2 lists and describes the most commonly used modes, how to enter the modes, and the resulting system prompts. The system prompt helps you identify which mode you are in and, therefore, which commands are available to you.
| Mode | Description of Use | How to Access | Prompt |
|---|---|---|---|
User EXEC | Log in. | | |
Privileged EXEC (Enable) | From the user EXEC mode, enter the enable command and the enable password. | | |
Global configuration | From the privileged EXEC mode, enter the configure terminal command. | | |
Interface configuration | From global configuration mode, enter the interface type location command. For example, enter | | |
Line configuration | From global configuration mode, enter the line console 0 command to configure the console port, or the line vty line-number command to configure a VTY line. | |
In any command mode, you can get a list of available commands by entering a question mark (?).
Router> ?
To obtain a list of commands that begin with a particular character sequence, type in those characters followed immediately by the question mark (?). Do not include a space. This form of help is called word help, because it completes a word for you.
Router# co?
configure
To list keywords or arguments, enter a question mark in place of a keyword or argument. Include a space before the question mark. This form of help is called command syntax help, because it reminds you which keywords or arguments are applicable based on the command, keywords, and arguments you have already entered.
Router# configure ?
memory Configure from NV memory
network Configure from a TFTP network host
overwrite-network Overwrite NV memory from TFTP network host
terminal Configure from the terminal
To redisplay a command you previously entered, press the up-arrow key. You can continue to press the up-arrow key to see more previously issued commands.
 | Tips If you are having trouble entering a command, check the system prompt, and enter the question mark (?) for a list of available commands. You might be in the wrong command mode or using incorrect syntax. |
You can press Ctrl-Z in any mode to immediately return to privileged EXEC (enable) mode, instead of entering exit, which returns you to the previous mode.
After you have installed the hardware, checked all external connections, turned on the system power, allowed the system to boot up, and minimally configured the system, you might need to perform more complete and complex configurations, which are beyond the scope of this document.
The Cisco IOS software running your switch router contains extensive features and functionality. The effective use of many of these features is easier if you have more reference information. For additional information on Cisco IOS software and configuring your router, refer to the following:
For systems with Cisco IOS Release 10.0(1) or later, refer to the following publications:
--- Cisco IOS Software Command Summary
--- Configuration Builder Getting Started Guide
--- Cisco Management Information Base (MIB) User Quick Reference
--- Debug Command Reference
--- Router Products Command Reference
--- Router Products Configuration Guide
--- System Error Messages
--- Troubleshooting Internetworking Systems
For systems with Cisco IOS Release 11.2(1) or later, refer to the following modular configuration and modular command reference publications:
--- Bridging and IBM Networking Configuration Guide
--- Bridging and IBM Networking Command Reference
--- Cisco IOS Software Command Summary
--- Cisco IOS Solutions for Voice, Video, and Home Applications
--- Cisco Management Information Base (MIB) User Quick Reference
--- Configuration Builder Getting Started Guide
--- Configuration Fundamentals Configuration Guide
--- Configuration Fundamentals Command Reference
--- Debug Command Reference
--- Network Protocols Configuration Guide, Parts 1, 2, and 3
--- Network Protocols Command Reference, Parts 1, 2, and 3
--- Quality of Service Solutions
--- Security Configuration Guide
--- Security Command Reference
--- System Error Messages
--- Troubleshooting Internetworking Systems
--- Wide-Area Networking Configuration Guide
--- Wide-Area Networking Command Reference
Posted: Wed Dec 22 14:08:27 PST 1999
Copyright 1989-1999©Cisco Systems Inc.