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Cisco ASR 901 Series Aggregation Services Router Software Configuration Guide
OL-23826-09
Chapter 5 Using the Command-Line Interface
Understanding Abbreviated Commands
Understanding Abbreviated Commands
You need to enter only enough characters for the router to recognize the command as unique.
This example shows how to use the show configuration privileged EXEC command in an abbreviated
form:
Router# show conf
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 5-3 lists some error messages that you might encounter while using the CLI to configure your
router.
command ? List the associated keywords for a command.
For example:
Router> show ?
command keyword ? List the associated arguments for a keyword.
For example:
Router(config)# cdp holdtime ?
<10-255> Length of time (in sec) that receiver must keep this packet
Table 5-2 Help Summary (continued)
Command Purpose