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Configuring an Ethernet Interface : How to Configure an Ethernet Interface of a CISCO Router

Updated on May 21, 2009

The Ethernet interface of a CISCO router can be configured from the console or through a virtual terminal line. The configuration of a CISCO router is very simple and easy. At first, you have to select the interface and then the IP address. Remember, each Ethernet interface must have an IP address and a subnet mask. This page contains all the information to configure the ethernet interface of a CISCO router.

Steps to configure the Ethernet interface of a CISCO router:

The steps to configure a CISCO Ethernet interface is described below:

Step 1:

At first, enter the global configuration mode and then enter the interface mode.  For example, to enter interface mode, you have to type interface fastEthernet0/0 command. Here, 0/0 means the port no or port slot. Put the Ethernet interface port/port slot according to the desired port you want to configure.

Step 2:

Now, configure the IP address and the subnet mask. Please, careful to use the correct subnet address.

Step 3:

At last, turn on the interface.

Pracitcal Example of a CISCO Router's Ethernet Interface Configuration

Let we have a CISCO router and there is a port fastEthernet0/0 which we want to configure. The IP address of that port will be and subnet mask will be The interface must be turned on.

Router Configuration Command

Router#configure terminal 
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#interface fastEthernet0/0
Router(config-if)#ip address
Router(config-if)#no shutdown 

%LINK-5-CHANGED: Interface FastEthernet0/0, changed state to up

Discussion of the above command

Before configuring the router, we access the global configuration mode. After accessing global configuration mode, we select the interface which we want to configure by the command interface fastEthernet0/0 and then set the IP address by the command ip address At last use the command no shutdown command to up the router.

Test yourself

You have given a CISCO router. You have to configure base on the following specifications:

  • Configure fastEthernet4/0 port
  • Assign IP address ( )

Answer / Solution: Click the following link

Cisco Router Configuration Example

© Written by rancidTaste

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    • profile image

      hekmatullah 6 years ago

      this is the good way to understand and solve someone's problem thnx alot for whome who upload this discription

      thnx agaig and i hope to share more ur valuable knowldge like that..

    • haidry profile image

      haidry 7 years ago

      Simple and clear introduction, and the way you wrote it really make simple for newbies.