Cisco 2950 Software Configuration Guide - Page 57
Using the Command-Line Interface, Cisco IOS Command Modes - switch ios
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CH A P T E R 2 Using the Command-Line Interface This chapter describes the Cisco IOS command-line interface (CLI) that you can use to configure your Catalyst 2950 and Catalyst 2955 switches. It contains these sections: • Cisco IOS Command Modes, page 2-1 • Getting Help, page 2-3 • Abbreviating Commands, page 2-4 • Using no and default Forms of Commands, page 2-4 • Understanding CLI Messages, page 2-5 • Using Command History, page 2-5 • Using Editing Features, page 2-6 • Searching and Filtering Output of show and more Commands, page 2-9 • Accessing the CLI, page 2-9 Cisco IOS Command Modes The user interface is divided into many different modes. The commands available to you depend on which mode you are currently in. Enter a question mark (?) at the system prompt to obtain a list of commands available for each command mode. When you start a session on the switch, you begin in user mode, often called user EXEC mode. Only a limited subset of the commands are available in user EXEC mode. For example, most of the user 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 user EXEC commands are not saved when the switch reboots. To have access to all commands, you must enter privileged EXEC mode. Normally, you must enter a password to enter privileged EXEC mode. From this mode, you can enter any privileged EXEC command or enter global configuration mode. Using the configuration modes (global, interface, and line), you can make changes to the running configuration. If you save the configuration, these commands are stored and used when the switch reboots. To access the various configuration modes, you must start at global configuration mode. From global configuration mode, you can enter interface configuration mode and line configuration mode. 78-11380-10 Catalyst 2950 and Catalyst 2955 Switch Software Configuration Guide 2-1
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