Cisco 3560G 48TS Software Configuration Guide - Page 58

Understanding no and default Forms of Commands Chapter 2 Using the Command-Line Interface Understanding no and default Forms of Commands Almost every configuration command also has a no form. In general, use the no form to disable a feature or function or reverse the action of a command. For example, the no shutdown interface configuration command reverses the shutdown of an interface. Use the command without the keyword no to re-enable a disabled feature or to enable a feature that is disabled by default. Configuration commands can also have a default form. The default form of a command returns the command setting to its default. Most commands are disabled by default, so the default form is the same as the no form. However, some commands are enabled by default and have variables set to certain default values. In these cases, the default command enables the command and sets variables to their default values. Understanding CLI Error Messages Table 2-3 lists some error messages that you might encounter while using the CLI to configure your switch. Table 2-3 Common CLI Error Messages Error Message Meaning How to Get Help % Ambiguous command: "show con" You did not enter enough characters Re-enter the command followed by a question mark (?) for your switch to recognize the with a space between the command and the question command. mark. The possible keywords that you can enter with the command appear. % Incomplete command. You did not enter all the keywords or Re-enter the command followed by a question mark (?) values required by this command. with a space between the command and the question mark. The possible keywords that you can enter with the command appear. % Invalid input detected You entered the command at '^' marker. incorrectly. The caret (^) marks the point of the error. Enter a question mark (?) to display all the commands that are available in this command mode. The possible keywords that you can enter with the command appear. Using Command History The software provides a history or record of commands that you have entered. The command history feature is particularly useful for recalling long or complex commands or entries, including access lists. You can customize this feature to suit your needs as described in these sections: • Changing the Command History Buffer Size, page 2-5 (optional) • Recalling Commands, page 2-5 (optional) • Disabling the Command History Feature, page 2-5 (optional) Catalyst 3560 Switch Software Configuration Guide 2-4 78-16156-01