This section will explain about the Cisco IOS Basic Commands.

CISCO IOS CLI commands

Cisco IOS Commands

Cisco IOS runs various commands on CLI ( Command Line Interface) mode. It supports a large number of commands that help to configure the Router with networking features and other router parameters. The different working modes of router support different levels of commands.

The user-mode command supports a few commands to change terminals, view the status of the network like ping, tracert, Enable command to enter on to the privileged mode, etc. and other basic level commands. The following table shows the different CLI commands supported by user mode.

Cisco IOS Basic Operation Command and Keys

Left Arrow or Ctrl+B Move the cursor by one character towards Left
Right Arrow or Ctrl+F Move the cursor by one character towards Right
Esc +B Move the Cursor Back by one Word
Esc + F Move the cursor Forward by one Word
Ctrl +A Move the cursor to the beginning of the command line
Ctrl +E Move the cursor to the end of the command line
Down Arrow or <Ctrl+N> Recall next command executed
Up Arrow or <Ctrl+P> Recalls the  last command executed
<Ctrl+R> Refresh screen output
TAB Complete the partial command typed
Logout or Exit or Quit Exit the Router

User Exec mode Command

The user-mode command supports a few commands to change terminals, view the status of the network like ping, tracert, Enable command to enter on to the privileged mode, etc. and other basic level commands. The following table shows the different CLI commands supported by user mode.

Router>ENABLE Enter the privileged exec mode.
Router>DISABLE To go back to the use exec mode form privileged mode.
Router>EXIT To Exit the router.
Router>LOGOUT To Exit the router.
Router>PING To test the connectivity of the network.
Router>RESUME Allow suspended telnet sessions.
Router>TELNET To connect the router through telnet.
Router>TRACERT To track the number hops from source to destination.

Privileged Exec mode command

The privileged mode command includes the commands supported by the user-mode as well as the other commands. The privileged mode supports all the Show and Copy command.

Router# VERSION Displays the router IOS version and the internal components.
Router#  SHOW RUNNING-CONFIG Displays the current configuration of the router.
Router# SHOW STARTUP-CONFIG Displays the configuration stored on NVRAM.
Router# SHOW FLASH Shows the content of the flash memory.
Router# SHOW INTERFACE Displays the status and the configuration of the router interface
Router# SHOW IP INTERFACE BRIEF Displays the status and overview of all the interfaces of the router
Router# SHOW CONTROLLERS 0 Displays the hardware-specific information about the router interfaces
Router# SHOW IP PROTOCOLS Displays the information on routing protocols.
Router# SHOW ACCESS-LISTS Shows the current access control list configured on the router.
Router# CDP NEIGHBOR Shows the details of CDP neighbors.
Router# IP ROUTE Displays the IP routing table entry on the router.
Router# COPY RUNNING-CONFIG   

                STARTUP-CONFIG

Copy the content of main memory i.e. current configuration into the NVRAM.
Router# COPY STARTUP-CONFIG

                RUNNING-CONFIG

Copy the content of NVRAM into the main memory.
Router# COPY RUNNING-CONFIG TFTP Copy current configuration into TFTP server.
Router# COPY TFTP RUNNING-CONFIG Copy the content of TFTP server into the main memory.
Router# COPY FLASH TFTP Copy the IOS image into TFTP server.
Router# COPY TFTP FLASH Copy the IOS image into flash.

Global configuration command

When we type in the configure terminal, we move into the global configuration mode. The configuration command in this mode will entirely change the router parameters. Global mode further classifies different specific configuration modes such as interface configuration mode, line configuration mode, sub-interface mode, etc.

Router(config)# enable password

1234

Sets Privileged Mode password.
Router(config)# enable secret 12345 Sets privileged mode password. Enable secret password is encrypted by default
Router(config)# line con 0
Router(config-line)#login
Router(config-line)#password 123456
Sets console password for the router to access through the console port
Router(config)# line aux 0
Router(config-line)#login
Router(config-line)#password 123456
Sets the auxiliary  password for the router to access through the auxiliary port
Router(config)# line vty 0 4
Router(config-line)#login
Router(config-line)#password 123456
Sets VTY password for the router to access through telnet. By default, the Cisco router support 5 telnet session simultaneously
Router(config)#router rip
Router(config-router)#network 172.20.0.0
Configures RIP protocol to the router.
Router(config)#no router rip Disable RIP protocol form the router.
Router(config)#router OSPF 1

Router(config-router)#network 172.20.0.0 0.0.255.255 Area 0

Configures the OSPF routing protocol to the router.
Router(config)#ip route 172.20.0.0 255.255.0.0 172.20.2.1 Configure static routing to the router
Router(config)#no cdp run To disable CDP protocol from the router.
Router(config)#cdp run To enable CDP on the router.

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