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Various Command Line Modes on Cisco routers and switches.

Cisco IOS is the internetwork operating system of both the Cisco switches and routers. It has two interfaces command line interface(CLI) and Graphical User Interface(GUI). Since CCNA exam will surely test your knowledge on these interfaces, it is important to get familiar with them.

Cisco’s IOS command-line interface (CLI) is a text-based interface integrated with the IOS. When a switch or router boots up, the IOS loads the startup configuration from NVRAM and displays the IOS prompt, waiting for commands. We can enter the IOS commands at the IOS prompt.

In this article, we will see various command line modes on Cisco routers and switches. For this, we are going to use Packet Tracer. To see what is Packet Tracer and how to install it in both Linux and Windows, go here. For a startup guide on Packet Tracer, see here. Open Packet Tracer  and select a Cisco 2960 switch.

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Hover on the switch to see its ports.

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Select a Computer from the End Devices and connect them with a Console wire. What we are simulating here is connecting to the switch from a PC through console.

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Click on the Host device( Computer ). On the window that opens, click on Desktop tab and Click on Terminal.

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The console opens with the switch booting. Switch finishes its booting operation and loads  into user EXEC mode.

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Coming to the modes of Cisco IOS, the Cisco IOS has five command line modes.

  • Setup mode
  • User EXEC mode
  • Privileged EXEC mode
  • Global configuration mode
  • Specific Configuraton mode

Setup mode

Setup mode is the initial configuration mode of Cisco switches and routers. They start in setup mode when no startup configuration exists in NVRAM. After completion of the setup mode,  the Cisco IOS transitions to user EXEC mode.

User EXEC mode

The user EXEC mode is the normal operation mode on Cisco switches and routers. The Cisco IOS user EXEC prompt is the switch or router name followed by the ‘greater than’ character >. See all the commands available in user EXEC prompt by typing ‘?’

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Privileged EXEC mode

Privileged EXEC mode is the advanced operation mode of Cisco IOS. It has been designed to restrict access to IOS commands that can have adverse effects on the Cisco device and its configuration. To enter privileged EXEC mode type “enable” or “en” .Privileged EXEC prompt is comprised of the switch or router name followed by the # character. To exit the privileged EXEC prompt type “disable”.

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To see the commands available in privileged EXEC prompt, type ?.

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Global Configuration mode

The global configuration mode is comprised of commands pertaining to the entire Cisco device. In other words, if we need to execute commands to modify the behavior of either the whole switch or the whole router we need to set the IOS in global configuration
mode. Global configuration mode can only be enabled from  privileged
EXEC mode by typing config t” or “conf t”. The prompt in this mode is comprised of the device name followed by “(config)#”.

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See the commands available in this mode by typing ‘?’. If we need to execute a command not available in the global configuration mode we should prefix the command by “do”.

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Specific configuration mode

The specific configuration mode is used for commands that affect the configuration of either just one part or range of components of the Cisco device. Suppose we want to work on a few interfaces (or ports) on our switch or router we need to enable specific configuration mode. We can enable specific configuration mode only from the global configuration mode by selecting the components we want to work with. The prompt in this mode is comprised of the router or switch host name followed by “(config-<component>)#”.

Let’s select interface fastethernet 0/1 by typing “interface fastethernet 0/1″. 

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If we want to run a command not available in specific configuration mode prefix the command by do”. For example, run the command “do show running-config” in specific configuration mode.

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We can exit from global configuration mode and specific configuration mode by typing “exit”.

7 thoughts on “Various Command Line Modes on Cisco routers and switches.

  1. […] Cisco IOS : Command Line Modes (kanishkashowto.wordpress.com) […]

  2. […] global configuration of the switch. If you are not aware of different modes of a Cisco switch, see here. The hostname command renames the switch. The rest of the commands are used to exit from global […]

  3. Is it possible to install an operating system on an end device say a pc in packet tracer.
    if possible wat are the configurations and steps of doing it..
    please reply via ma email. Thx

    1. Hi, Mulinda Yahaya. No you can’t do that in Packet Tracer. But you can do this in GNS3

      1. Thanks kanishka10 for your reply.
        I came across such a question in one of the practical exams.

        How about CCNP. what is it about?

  4. […] interface. Go back to Privileged Exec Mode (To know about different modes on Cisco IOS, go here)  and type command “show ipv6  interface ethernet1/0″. We can see that IPv6 is […]

  5. […] global configuration of the switch. If you are not aware of different modes of a Cisco switch, see here. The “hostname” command renames the switch. The rest of the commands are used to exit […]

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