Using the Command-Line Interface in Cisco IOS and Cisco IOS XE Software
Using the CLI
ii
Changing the Default Settings for a Console or AUX Port
There are only two changes that you can make to a console port and an AUX port:
• Change the port speed with the config-register 0x command. Changing the port speed is not
recommended. The well-known default speed is 9600.
• Change the behavior of the port; for example, by adding a password or changing the timeout value.
Note The AUX port on the Route Processor (RP) installed in a Cisco ASR1000 series router does not serve
any useful customer purpose and should be accessed only under the advisement of a customer support
representative.
Using the CLI
This section describes the following topics:
• Understanding Command Modes, page ii
• Using the Interactive Help Feature, page v
• Understanding Command Syntax, page vi
• Understanding Enable and Enable Secret Passwords, page viii
• Using the Command History Feature, page viii
• Abbreviating Commands, page ix
• Using Aliases for CLI Commands, page ix
• Using the no and default Forms of Commands, page x
• Using the debug Command, page x
• Filtering Output Using Output Modifiers, page x
• Understanding CLI Error Messages, page xi
Understanding Command Modes
The CLI command mode structure is hierarchical, and each mode supports a set of specific commands.
This section describes the most common of the many modes that exist.
Table 1 lists common command modes with associated CLI prompts, access and exit methods, and a
brief description of how each mode is used.
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