A-3
Cisco Secure Router 520 Series Software Configuration Guide
OL-14210-01
Appendix A Cisco IOS Software Basic Skills
Understanding Command Modes
Tab l e A-2 Command Modes Summary
Mode Access Method Prompt Exit and Entrance Method About This Mode
User EXEC Begin a session with
your router.
Router> To exit a router session, enter
the logout command.
Use this mode for these tasks:
• Change terminal settings.
• Perform basic tests.
• Display system information.
Privileged
EXEC
Enter the enable
command from user
EXEC mode.
Router# • To exit to user EXEC
mode, enter the disable
command.
• To enter global
configuration mode,
enter the configure
command.
Use this mode for these tasks:
• Configure your router
operating parameters.
• Perform the verification steps
shown in this guide.
To prevent unauthorized changes
to your router configuration,
access to this mode should be
protected with a password as
described in “Enable Secret
Passwords and Enable Passwords”
later in this chapter.
Global
configuration
Enter the configure
command from
privileged EXEC
mode.
Router
(config)#
• To exit to privileged
EXEC mode, enter the
exit or end command, or
press Ctrl-Z.
• To enter interface
configuration mode,
enter the interface
command.
Use this mode to configure
parameters that apply to your
router as a whole.
Also, you can access the following
modes, which are described later in
this table:
• Interface configuration
• Router configuration
• Line configuration
Interface
configuration
Enter the interface
command (with a
specific interface, such
as interface atm 0)
from global
configuration mode.
Router
(config-if)#
• To exit to global
configuration mode,
enter the exit command.
• To exit to privileged
EXEC mode, enter the
end command, or press
Ctrl-Z.
• To enter subinterface
configuration mode,
specify a subinterface
with the interface
command.
Use this mode to configure
parameters for the router Ethernet
and serial interfaces or
subinterfaces.