This tutorial describes what the Cisco IOS settings are and also how they job-related in detail. Discover the Cisco modes and the regulates that are supplied to navigate and accessibility them.

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Cisco IOS software allows us to manage the Cisco machine on which that runs. IOS software includes several regulates to configure and control Cisco devices. No all these regulates are the same. Some commands only administer information if others allow us to configure and control a certain feature, or a details area the the device, or the entire device.

Based on how IOS commands impact the device, they room organized right into the modes. An IOS mode is a team of commands that are used to configure similar features or to manage a particular area the the device. An IOS setting is also known together the IOS accessibility mode or the IOS commands mode.

There are five IOS modes: - user EXEC mode, privileged EXEC mode, worldwide configuration mode, setup mode, and also ROM monitor mode.

The first three modes are supplied to view current settings and also configure new settings or modify existing settings. The following two settings are offered to collection up the initial machine configuration and troubleshoot the machine in an emergency, respectively.

Let"s understand each mode in detail.

User EXEC Mode


This is the first mode that the IOS. No matter how a user accesses the IOS, the IOS constantly places the user in this mode. If configured, the IOS prompts the user to get in the password to access this mode.

This mode has actually very minimal commands that allow the user to check out statistics and perform simple troubleshooting. This mode does not allow the user to adjust any of the settings. This setting is the starting (or entry) allude of the IOS. Other settings of the IOS can only it is in accessed with this mode.

Privileged EXEC Mode

This is the 2nd mode of the IOS. This mode deserve to be accessed just from the user exec setting by executing the enable command. Due to the fact that the enable command is used to accessibility this mode, this mode is also known as the enable mode.

To nearby this setting or to return right into the user exec mode, use the exit command or the end command.

As the name suggests, this mode has privileged or powerful commands. This mode is usually supplied for the adhering to purposes: -

come view, save and erase an equipment configuration To take the back-up of the current an equipment configuration To restore the construction from backup To install a brand-new IOS image paper To debug or troubleshoot the an equipment To restart or reload the device

Although this mode allows the user come manage an equipment configuration and IOS photo files, that does not permit the user to readjust the device configuration. A user can change device configuration only from the construction mode.

Global configuration mode

As the surname suggests, this mode includes the commands that are supplied to configure the device. Native this mode, a user can not only configure brand-new settings but can also change, upgrade or delete currently settings.

To enter this mode, usage the "configure terminal" command native the privileged-exec mode. To departure from this mode, you can use the "end" or the "exit" commands. Friend can additionally press the CTRL + Z an essential combinations.

The complying with image shows just how to navigate between the user exec mode, privileged exec mode and also the worldwide configuration mode.

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Of all accessible modes, this mode has the largest variety of commands. Come organize this commands much more effectively, this mode groups similar commands right into sub-configuration modes.

Sub-configuration settings are IOS specific. Cisco renders several flavors of IOS software. A sub-configuration mode available in one smell of IOS may or may not be accessible in various other flavors that IOS.

The following table lists few of the most common sub-configuration settings that room commonly easily accessible across all spices of the IOS.


Sub-configuration modeContains regulates that are used to: -
Interface construction modeConfigure a physical user interface of the device
Sub-interface configuration modeConfigure virtual interfaces
Routing protocol construction modeConfigure a routing protocol
IP accessibility list configuration modeConfigure in-built security feature of the IOS
Line configuration modeConfigure accessibility modes of the IOS

Setup Mode

When we power-on the IOS activate device, the IOS looks for the device configuration. If it does not find a precious configuration, it places the user in this mode. This mode permits the user come configure the initial an equipment configuration.

This mode presents a text-based wizard the asks questions around initial settings in the sequence. Based upon the answers noted by the user, the IOS automatically builds the early configuration.

ROMMON Mode

During the boots process, the IOS image file is loaded into the RAM. If the IOS image record is absent or corrupt, the an equipment automatically beginning this mode. This mode permits the user come troubleshoot the IOS.

In this mode, the user can choose a various IOS image paper to boot the machine or fill a brand-new IOS image file from the TFTP server.

The adhering to image shows exactly how all IOS modes work together.

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Cisco IOS settings navigation

The following table lists regulates that are offered to navigate the different modes of the IOS.


ModePromptCommand come enterCommand to exit
User EXECRouter >Default mode after booting. Login with the password, if configured. Use the exit command
Privileged EXECRouter # Use the enable command indigenous the user exec mode Use the exit or finish command
Global ConfigurationRouter(config)#Use the "configure terminal" command native the privileged exec mode Use the exit command
Interface ConfigurationRouter(config-if)# Use the "interface form number" command native the worldwide configuration mode usage the leave command come return in global configuration mode
Sub-Interface ConfigurationRouter(config-subif) use the "interface type sub interface number" command native the global configuration setting or the interface configure mode. Use the exit command come return in the vault mode. Use the end command to return in the privileged exec mode.
SetupParameter:After booting, the IOS immediately starts this mode, if it does not detect the running configuration. Press CTRL+C come abort. Form Yes to conserve the configuration, or No to exit without saving once asked in ~ the end of the setup program.
ROMMONROMMON>Starts immediately if functional IOS is missing. To start manually, press the CTRL + C vital during the very first 60 seconds of the booting procedure Use the exit command.

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That"s all from this part. In the next component of this tutorial, we will learn how to take the back-up of the IOS and restore it from the backup when the is required. If you choose this tutorial, please don"t forget to share it through friends through your favorite social network.