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 Cisco Router CLl Commands page 1 of 2

To understand the CISCO Router CLI commands, basic usage and configuration of cisco routers you have to understand the command line interface(cli) of the cisco ios. It is through the CLI, every instructions or commands are given to the router(it is like the command prompt in windows or shell prompt in linux).

This means that you need to learn how to configure the Cisco IOS operating system which runs on routers, switches and other network devices. Acquiring this hands-on experience with the Cisco IOS CLI will help you enormously in your network administration tasks or even for certification exams.

The command line interface(cli) has the following modes or levels of access for the execution of the router commands.

1. User execution mode
2. Privilege execution mode
3. Global configuration mode
   3.1 interface configuration mode
   3.2 sub-interface configuration mode
   3.3 line configuration mode
   3.4 router configuration mode

1. User execution mode

   a. to view the statistics of the router
   b. we cannot do any modifications to the configuration in this mode.
   
   Examples :

    To view help type the command as follows in the router command prompt :

       router>?

    To display commands starting with letter 's'

       router>s?

2. Privilege execution mode

   Here changes can be made and will affect the configuration of this router
   
   a. To enter into privilege mode from user mode :

      router>enable

      then the prompt changes to

      router#

   b. To quit

      router#logout

   c. To view various parameters that can be used with the 'show' command :

      router# show ?

   d. To view the ios version:

      router# show version

   e. To copy the configuration from dram(temporary memory) to nvram(permanent memory) :

      router# copy running-config startup-config    (or) router# copy run start   (or) router# wr

   f. To view the content of the running config(dram) :

      router# show running-config (or) router# sh run

   g. To view the content of the startup config(nvram) :

      router# show startup-config (or) router# sh start

   h. To view the commands previously typed in the cli (by default 10 entries are shown)

      router# show history

   i. To change the default history size

      router# terminal history size 20

   j. To view the history size setting

      router# show terminal

   k. To view content of flash memory

      router# show flash

   l. To view the settings of the ethernet port 0

      router# show int e0

   m. To view the settings of the serial port 0

      router# show int s0

   n. To view the settings of all interfaces

      router# show interfaces

   o.To view the settings of all interfaces

      router# show ip interface brief    <-- to view only minimal details


 

 Here I’m providing some useful keyboard shortcuts that you can use when configuring a Cisco device via command line. These shortcuts are sometimes asked in CCNA certification exam questions.

Keyboard Shortcut

Action

Up Arrow Particularly useful. It displays your previous commands. Pressing the up arrow repeatedly will show all previous commands typed (command history)
TAB Key Particularly useful. It completes a partially typed CLI command. E.g if you type “show run” and press TAB, it will complete the command as “show running-config
CTRL+Z Takes you back to Privileged EXEC Mode. E.g if you are in Global Config Mode Router(config)# and press CTRL+Z it will take you back to Router# mode
CTRL+A Places the cursor at the beginning of a line
CTRL+E Places the cursor at the end of a line
CTRL+R Redisplays the current command line
CTRL+W Erases a word (behind the cursor)
CTRL+U Erases an entire line

The above are the most useful and most frequently used shortcuts. There are many more but if you learn the ones above is more than enough.

 

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