![]() ![]() For example, if you were in global configuration mode and wanted to see all the keywords or arguments for the arap command, you would type arap ?. The Cisco IOS software displays a list and brief description of available keywords and arguments. To display keywords and arguments for a command, enter a question mark ( ?) at the configuration prompt or after entering part of a command followed by a space. The syntax can consist of optional or required keywords and arguments. This section provides an example of how to display syntax for a command. (Space between command and question mark.) Lists the keywords or arguments that you must enter next on the command line. It also shows examples of the prompts displayed for each mode. Table 1 describes how to access and exit various common command modes of the Cisco IOS software. If a valid software image is not found when the software boots or if the configuration file is corrupted at startup, the software might enter ROM monitor mode. ROM monitor mode is a separate mode used when the Cisco IOS software cannot load properly. From global configuration mode, you can enter interface configuration mode and a variety of other modes, such as protocol-specific modes. To enter specific configuration modes, you must start at global configuration mode. If you later save the running configuration to the startup configuration, these changed commands are stored when the software is rebooted. The EXEC commands are not saved when the software reboots.Ĭonfiguration modes allow you to make changes to the running configuration. For example, show commands show important status information, and clear commands clear counters or interfaces. Most EXEC commands are one-time commands. From privileged EXEC mode you can issue any EXEC command-user or privileged mode-or you can enter global configuration mode. ![]() To have access to all commands, you must enter privileged EXEC mode, normally by using a password. User EXEC mode contains only a limited subset of commands. When you log in to the CLI, you are in user EXEC mode. Entering a question mark ( ?) at the CLI prompt allows you to obtain a list of commands available for each command mode. ![]() Because the CLI is divided into many different modes, the commands available to you at any given time depend on the mode you are currently in. You use the CLI to access Cisco IOS software. Filtering Output from the show and more Commandsįor an overview of Cisco IOS software configuration, refer to the Cisco IOS Configuration Fundamentals Configuration Guide.įor information on the conventions used in the Cisco IOS software documentation set, see the chapter "About Cisco IOS Software Documentation" located at the beginning of this book.Using the no and default Forms of Commands.This chapter provides helpful tips for understanding and configuring Cisco IOS software using the command-line interface (CLI). Using the no and default Forms of Commandsįiltering Output from the show and more Commands ![]()
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