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Cisco ONS 15530 Configuration Guide and Command Reference
78-14227-01, Cisco IOS Release 12.1(10)EV2
Chapter2 Before You Begin
About Cisco IOS Command Modes
The configuration modes allow you to make changes to the running configuration. If yo u late r save the
configuration, these commands are stored across system reboots. You must start at global configuration
mode. From global configuration mode, you can enter interface configuration mode, subinterface
configuration mode, and a variety submodes.
ROM (Read-only memory) monitor mode is a separate mode used when the system cannot boot properly.
For example, your system or access server might enter ROM monitor mode if it does not find a valid
system image when it is booting, or if its configuration file is corrupted at startup.
Table 2 -1 lists and describes the most commonly used modes, how to enter the modes, and the resulting
system prompts. The system prompt helps you identify which mod e yo u are in a nd, t her ef ore, w hich
commands are available to you.
Table2-1 Frequently Used IOS Command Modes
Mode Description of Use How to Access Prompt
User EXEC To connect to remote devices,
change terminal settings on a
temporary basis, perform basic
tests, and display system infor-
mation.
Log in. Switch>
Privileged EXEC (Enable) To set operating parameters. The
privileged command set includes
the commands in user EXEC
mode, as well as the configure
command. Use this command to
access the other command
modes.
From the user EXEC mode,
enter the enable command and
the enable password.
Switch#
Global configuration To configure features that affect
the system as a whole. From the privileged EXEC
mode, enter the configure
terminal command.
Switch(config)#
Interface configuration To enable features for a particu-
lar interface. Interface
commands enable or modify the
operation of a port.
From global configuration
mode, enter the interface type
location command.
For example, enter
interface fastethernet 0
Switch(config-if)#
Line configuration To configure the console port or
VTY line from the directly
connected console or the virtual
terminal used with Telnet.
From global configuration
mode, enter the line console 0
command to configure the
console port, or the line vty
line-number command to
configure a VTY line.
Switch(config-line)#
Redundancy configuration To configure system redundancy. From global configuration
mode, enter the redundancy
command.
Switch(config-red)#
APS1 configuration To configure APS redundancy
features. From redundancy configuration
mode, enter the associate
group command.
Switch(config-aps)#