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Configuring EIGRP

Consider the topology given below –

Configuring EIGRP

The initial IP configuration table is given below:

Devices Interface IP address
Router1 Se0/0/0 192.168.10.1
Router1 Fa0/0 10.0.0.1
Router2 Se0/0/0 192.168.10.2
Router2 Fa0/0 20.0.0.1
Switch1 N/A N/A
Switch1 N/A N/A
PC1 Fa0 10.0.0.2
PC2 Fa0 10.0.0.3
PC3 Fa0 20.0.0.2
PC4 Fa0 20.0.0.3

Configure IP address to router’s interfaces

Router1

On router1, give the following commands to configure hostname and IP address.

Router>enable is used to enter the   privileged exec mode.   
Router#configure   terminal is used to enter the global configuration mode.   Router(config)#hostname   R1 is used to identify the router in the whole   network uniquely.   R1(config)#interface   s0/0/0 is used to enter the serial interface.   
R1(config-if)#ip   address 192.168.10.1 255.255.255.0 is used to configure an IP address in the serial interface.   
R1(config-if)#clock   rate 64000 is used to control the data flow.   
R1(config-if)#no   shutdown is used to make interface always up.   
R1(config-if)#exit is used   to return the previous mode.   
R1(config)#interface   f0/0 is used to enter the fastEthernet.   
R1(config-if)#ip   address 10.0.0.1 255.0.0.0 is used to configure an IP address in the fastEthernet interface.   
R1(config-if)#no   shutdown is used to make interface always up.   R1(config-if)#exit is used   to move to global configuration mode.   
R1(config)#

Router2

On router2, give the following commands to configure hostname and IP address.

Router>enable
Router#configure terminal   
Router(config)#hostname R2   
R2(config)#interface s0/0/0
R2(config-if)#ip address 192.168.10.2   255.255.255.0
R2(config-if)#no shutdown
R2(config-if)#exit
R2(config)#interface f0/0
R2(config-if)#ip address 20.0.0.1 255.0.0.0
R2(config-if)#no shutdown
R2(config-if)#exit
R2(config)#

Configure the EIGRP routing protocol -

To enable EIGRP, the following commands are used:

R1(config)#router   eigrp 21  is used   to enable EIGRP with AS number 21. 
R1(config-router)#network   10.0.0.0 is used to enable   EIGRP on interfaces which belongs tonetwork 10.0.0.0   
R1(config-router)#network  192.168.10.0  is used to enable EIGRP on interfaces which belongs to network   192.168.10.0.   
R1(config-router)#exit   is used to move the global configuration mode. 
R1(config)#

The following screenshot shows the EIGRP configuration on Router1 and Router2.

Router2

Verifying EIGRP Routing

To verify EIGRP Routing, we use "show ip route" command on the routers (router1 or router2). If in the routing table there is the entry of the symbol "D" then we say that EIGRP is enabled in the network.

The following screenshots show the Routing table:

Router1

Router2

To verify that routers have become neighbors, we use "show ip eigrp neighbors" command on either router.

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