EIGRP Configuration on GNS3(single AS)

This is the simple tutorial for EIGRP configuration on GNS3. this topology consisit of six routers, you can use less routers, i am using six routers because in coming post i will show the EIGRP summarization, different AS configuration and MPLS configuration with this topology.

Create the topology as shown above in gns3, and configure all routers as follow.

R1 configuration:

R1#config t

R1(config)#int s1/0 
R1(config-if)#ip address 1.1.1.1 255.255.255.0 

R1(config-if)#no shu

R1(config-if)#ex

R1(config)#int loopback 1

R1(config-if)#ip address 192.168.1.1 255.255.255.0 
R1(config-if)#int loopback 2 
R1(config-if)#ip address 192.168.2.1 255.255.255.0 

R1(config-if)#int loopback 3

R1(config-if)#ip address 192.168.3.1 255.255.255.0 

R1(config-if)#int loopback 4

R1(config-if)#ip address 192.168.4.1 255.255.255.0 

R1(config-if)#int loopback 5

R1(config-if)#ip address 192.168.5.1 255.255.255.0 

R1(config-if)#int loopback 6

R1(config-if)#ip address 192.168.6.1 255.255.255.0 

R1(config-if)#int loopback 7

R1(config-if)#ip address 192.168.7.1 255.255.255.0 
R1 EIGRP configuration commands: 
R1(config)#router eigrp 100 
R1(config-router)#network 1.1.1.0 0.0.0.255 
R1(config-router)#network 192.168.1.0 0.0.7.255 

R1(config-router)#no auto-summary

I advertised all loopbacks from 192.168.1.0 to 192.168.7.0 by using command "network 192.168.1.0 0.0.7.255". Valid card mask 0.0.7.255 representing subnets from 0-7.

R2 configuration:

R2(config)#interface s1/0

R2(config-if)#ip address 1.1.1.2 255.255.255.0 

R2(config-if)#no shu

R2(config-if)#int s1/1

R2(config-if)#ip address 2.2.2.1 255.255.255.0R2(config-if)#no shutdown

R2 EIGRP configuration commands:

R2(config)#router eigrp 100

R2(config-router)#no auto-summary
R2(config-router)#network 1.1.1.0 0.0.0.255 
R2(config-router)#network 2.2.2.0 0.0.0.255 

R3 configuration:

R3(config)#int s1/0

R3(config-if)#ip address 2.2.2.2 255.255.255.0
R3(config-if)#no shutdown 
R3(config-if)#int s1/1 

R3(config-if)#ip address 3.3.3.1 255.255.255.0

R3(config-if)#no shutdown

R3(config-if)#int s1/2 

R3(config-if)#ip address 4.4.4.1 255.255.255.0

R3(config-if)#no shutdown

R3 EIGRP configuration commands:

R3(config)#router eigrp 100

R3(config-router)#no auto-summary
R3(config-router)#network 2.2.2.0 0.0.0.255 
R3(config-router)#network 3.3.3.0 0.0.0.255 

R3(config-router)#network 4.4.4.0 0.0.0.255

R4 configuration:

R4(config)#int s1/0

R4(config-if)#ip address 3.3.3.2 255.255.255.0 

R4(config-if)#no shu

R4(config-if)#int s1/1
R4(config-if)#ip address 6.6.6.1 255.255.255.0 

R4(config-if)#no shu

R4 EIGRP configuration commands:

R4(config)#router eigrp 100

R4(config-router)#network 3.3.3.0 0.0.0.255
R4(config-router)#network 6.6.6.0 0.0.0.255 
R4(config-router)#no auto-summary 

R5 configuration:

R5(config)#int s1/0

R5(config-if)#ip address 4.4.4.2 255.255.255.0 

R5(config-if)#no shu

R5(config)#int gigabitEthernet 2/0
R5(config-if)#ip address 5.5.5.1 255.255.255.0 

R5(config-if)#no shu

R5 EIGRP configuration commands:

R5(config)#router eigrp 100

R5(config-router)#network 4.4.4.0 0.0.0.255
R5(config-router)#network 5.5.5.0 0.0.0.255 
R5(config-router)#no auto-summary 

R6 configuration:

R6(config)#int g2/0

R6(config-if)#ip address 5.5.5.2 255.255.255.0
R6(config-if)#int g2/0 
R6(config-if)#ip address 6.6.6.2 255.255.255.0 

R6(config-if)#no shu

R6(config)#int loopback 1
R6(config-if)#ip address 200.1.0.1 255.255.255.0 

R6(config-if)#int loopback 2

R6(config-if)#ip address 200.1.1.1 255.255.255.0 

R6(config-if)#int loopback 3

R6(config-if)#ip address 200.1.2.1 255.255.255.0 

R6(config-if)#int loopback 4

R6(config-if)#ip address 200.1.3.1 255.255.255.0 

R6 EIGRP configuration commands:

R6(config)#router eigrp 100

R6(config-router)#network 200.1.0.0 0.0.3.255 

R6(config-router)#network 5.5.5.0 0.0.0.255

R6(config-router)#network 6.6.6.0 0.0.0.255
R6(config-router)#no auto-summary 

EIGRP Verification Commands:

"Show ip route" will show all networks on all routers.

 End to end ping should be successful.