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Tutorials

Cisco Router interface configuration commands

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How to view the summary of the router interfaces

To view the summary of the router interfaces, run the IOS command "show ip interface brief" from privileged mode.

  omnisecu.com.router01#show ip interface brief
Interface IP-Address OK? Method Status Protocol
FastEthernet0/0 172.16.0.1 YES manual up up
FastEthernet0/1 unassigned YES unset administratively down down
Serial0/0 172.17.0.1 YES manual up up
Serial0/1 unassigned YES unset administratively down down

How to open interface configuration mode

To open interface configuration mode, type "interface interface_name" from global configuration mode.

omnisecu.com.router01(config)#interface fa0/0
omnisecu.com.router01(config-if)#

How o assign an IP address to a router interface

To assign an IP address to an interface run the following command from interface configuration mode.

omnisecu.com.router01(config-if)#ip address 172.16.0.1 255.255.0.0

You have to enter both IP address and subnet mask.

How to add a description to router interface

To add a description to router interface, run the following command from router interface configuration mode.

omnisecu.com.router01(config-if)#description Main Building LAN

The configured description can be viewed in the output of the "show interfaces" command.

How to disable a router interface

To disable a router interface run "shutdown" IOS command from interface configuration mode.

omnisecu.com.router01(config-if)#shutdown
%LINK-5-CHANGED: Interface FastEthernet0/0, changed state to administratively down
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to down

How to enable a router interface

To enable a router interface run "no shutdown" IOS command from interface configuration mode.

omnisecu.com.router01(config-if)#no shutdown
omnisecu.com.router01(config-if)#
LINK-5-CHANGED: Interface FastEthernet0/0, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up
              Jajish Thomason Google+
Related Topics
Cisco IOS Command Line modes
Basic Cisco Router Configuration Commands
Cisco Router Show Commands
Important Key Combinations of Cisco IOS Command Line Interface (CLI)
Router interface naming convention

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