Interface IP Address Configuration

Real World Application:

As a Cisco network engineer, you need to know how to configure IP address on different types of interfaces. After all, what good is a Cisco router, if it cannot be routed?

Cisco equipment, network equipment, the IP address assigned to an interface is the basic requirement for all Cisco devices.


However, you can have more than one IPv4 address assigned to a single interface, but there's a problem here. When working with dynamic routing protocols, ads from the primary address. Secondary addresses commonly used IP address migration, moving from class c to class a addresses during the programme.

Lab Objectives:

• IConfigure 10.234.51.254/24 FastEthernet0/0 the primary IP address on the interface
• Configuration 172.27.48.254/24 a secondary IP address on the interface FastEthernet0/0
• FastEthernet0/0 interface is activated.
• Verify the configuration by running the configuration changes.

Lab Instruction:

The IP address configured on the Cisco routers and switches is a very common task, you need to know how to do that, and does not refer to any document as a CCNA.


To get started, browse your way into the global configuration mode is shown below;

Router con0 is now available

Press RETURN to get started.

Router>enable
Password: 
Router#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#

Step 1. Configure IP address 10.234.51.254 on the--FastEthernet0/0 interface. In order for this configuration you need to place themselves in the FastEthernet0/0 interface configuration mode looks like this;

To view the interface configuration is available for the implementation of the interface? From global configuration mode.


Router(config)#interface FastEthernet 0/0
Router(config-if)#

In interface configuration mode, use the command syntax is IP address n.n.n.h s.s.s.m; completed the first lab targets we need to perform IP address 10.234.51.254 255.255.255.0 FastEthernet0/0 see below; interface configuration mode

Router(config-if)#ip address 10.234.51.254 255.255.255.0
Router(config-if)#

Step 2. Interface FastEthernet0/0 configuration 172.27.48.254/24 a secondary IP address

As indicated by laboratory, the secondary IP addresses typically used during network re IP migration. By Cisco systems, architectural design of the secondary IP addresses is not recommended as production. The second goal to complete this lab, you need the IP address command to use the correct address and simply add a secondary to the command syntax for the end of the word.

Router(config-if)#ip address 172.27.48.254 255.255.255.0 secondary
Router(config-if)#

Step 3. Activate the FastEthernet0/0 Interface. By default, all interfaces on a Cisco router are placed in “Administratively Down”. To bring an interface up, issue the no shutdown command.

Router(config-if)#no shutdown
Router(config-if)#
%LINK-3-UPDOWN: Interface FastEthernet0/0, changed state to up
%LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/0, changed state to up
Router(config-if)#