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Cisco IOS Software Configuration Guide for Cisco Aironet Access Points
OL-29225-01
Chapter 3 Using the Command-Line Interface
Using the no and Default Forms of Commands
Using the no and Default Forms of Commands
Most configuration commands also have 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 Messages
Table 3-3 lists some error messages that you might encounter while using the CLI to configure the
wireless device.
Using Command History
The CLI provides a history or record of commands that you have entered. This feature is particularly
useful for recalling long or complex commands or entries, including access lists. You can customize the
command history feature to suit your needs as described in these sections:
• Changing the Command History Buffer Size, page 3-5
• Recalling Commands, page 3-5
• Disabling the Command History Feature, page 3-5
Table 3-3 Common CLI Error Messages
Error Message Meaning How to Get Help
% Ambiguous command:
"show con"
You did not enter enough characters
for the wireless device to recognize
the command.
Re-enter the command followed by a question mark (?)
with a space between the command and the question
mark.
The possible keywords that you can enter with the
command are displayed.
% Incomplete command.
You did not enter all the keywords or
values required by this command.
Re-enter the command followed by a question mark (?)
with a space between the command and the question
mark.
The possible keywords that you can enter with the
command are displayed.
% Invalid input detected
at ‘^’ marker.
You entered the command
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 are displayed.