Using No and Default Forms of Commands

Almost every configuration command has a no form. In general, use the no form to:

1. Disable a feature or function.
2. Reset a command to its default values.
3. Reverse the action of a command.
4. Use the command without the no form to reenable a disabled feature or to reverse the action of a no command.

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. The reference page for the command describes these conditions.