How to Configure EIGRP Routing Protocol With Simple Network Topology

EIGRP Enhanced Interior Gateway Routing Protocol

It has been described as a hybrid routing protocol
Administrative distance (AD)-90
Support for CIDR and VLSM
It uses diffusion algorithm to find the best path
Metric=256x(Bandwidth+Delay)
It uses RTP (a reliable transport protocol)
Multi-protocol support
Fast convergence

Now we're going to see EIGRP routing configurations and using a datagram tracer, a simple network topology

Step one: create a topology and configuration IP address like
All of the interface and the PC.

Router R1,Configuration


In Global configuration mode,

R1(config)#interface fastethernet 0/0
R1(config-if)#ip address 10.0.0.1 255.0.0.0
R1(config-if)#no shutdown
R1(config-if)#exit

Once you have given no shutdown command the port become up

R1(config)#interface serial 2/0
R1(config-if)#ip address 20.0.0.1 255.0.0.0
R1(config-if)#clock rate 64000
R1(config-if)#encapsulation ppp
R1(config-if)#no shutdown
R1(config-if)#exit

Router R2,Config


In Global configuration mode,

R2#config terminal
R2(config)#interface serial 2/0
R2(config-if)#ip address 20.0.0.2 255.0.0.0
R2(config-if)#encapsulation ppp
R2(config-if)#no shutdown
R2(config-if)#exit

Interface Serial2/0 and Line protocol on Interface Serial2/0 changed state to up


R2(config)#
R2(config)#interface serial 3/0
R2(config-if)#ip address 30.0.0.1 255.0.0.0
R2(config-if)#clock rate 64000
R2(config-if)#encapsulation ppp
R2(config-if)#no shutdown
R2(config-if)#exit

Router R3,Config


In Global configuration mode,


R3(config)#interface serial 3/0
R3(config-if)#ip address 30.0.0.2 255.0.0.0
R3(config-if)#encapsulation ppp
R3(config-if)#no shutdown
R3(config-if)#exit


Interface Serial3/0 and Line protocol, changed state to up


R3(config)#interface fastethernet0/0
R3(config-if)#ip address 40.0.0.1 255.0.0.0
R3(config-if)#no shutdown
R3(config-if)#exit

Interface fastethernet0/0 and wire protocols, changed State to up

All the IP addresses of all interfaces and assign it lights green. If there is any error we get red or amber.

Step 2:Now we see how to configure EIGRP routing protocols in this routers.


R1 Router,In Global Configuration mode,


R1(config)#router eigrp 200
R1(config-router)#network 10.0.0.0
R1(config-router)#network 20.0.0.0
R1(config-router)#exit

R2 Router,In Global Configuration mode,

R2(config)#router eigrp 200
R2(config-router)#network 20.0.0.0
R2(config-router)#network 30.0.0.0
R2(config-router)#exit


R3 Router,In Global Configuration mode,


R3(config)#router eigrp 200
R3(config-router)#network 30.0.0.0
R3(config-router)#network 40.0.0.0
R3(config-router)#exit

I.e.here 200 Atonomous systems, which was down common admistration, different router router Atonomous Number groupings
Will not communicate with each other. So the Atonomous should be the same on all routers.