Cisco Systems 2950 Using no and default Forms of Commands, Understanding CLI Messages

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Catalyst2950 Desktop Switch Software Configuration Guide
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Chapter2 Us ing the Command-Line Interface
Using no and default Forms of Commands
Using no and default Forms of Commands
Almost every configuration command als o has a no form. In genera l, use th e no form to disable a feature
or function or reverse the action of a command. For example, the no shutdown interface configur atio n
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 ha ve v ariables set to certain def ault
values. In these cases, the default command enables the command and sets variables to their default
values.
Understanding CLI Messages
Table 2 -3 lists some error messages that you migh t e nc ounte r w hil e using t he C LI to co nfigure your
switch.
Table2-3 Common CLI Error Messages
Error Message Meaning How to Get Help
% Ambiguous command:
"show con" You did not enter enough characters
for your switch 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.