How To Configure EIGRP Basic Topology

EIGRP "Enhanced Interior Gateway Protocol"

For this given topology in Cisco Packet Tracer , comprising four routers and a switch, we can configure EIGRP by following some simple steps :

• Select and place four routers and a switch, then connect them through cable.
              
   
  
• Configure each router by providing IP addresses to there interfaces and allotting some loop-backs too...!!
• Now you just  have to run EIGRP...& thats it..!!

 For Router 0 :

Router0>en

Router0#config t

Router0(config)#interface Loopback1

Router0(config-if )#ip address 1.0.0.1 255.255.255.0

Router0(config-if )#interface Loopback2

Router0(config-if )#ip address 1.0.1.1 255.255.255.0

Router0(config-if )#interface Loopback3

Router0(config-if )#ip address 1.0.2.1 255.255.255.0

Router0(config-if )#interface Loopback4

Router0(config-if )#ip address 1.0.3.1 255.255.255.0

Router0(config-if )#interface Loopback5

Router0(config-if )#ip address 1.0.4.1 255.255.255.0

Router0(config-if )#interface Loopback6

Router0(config-if )#ip address 1.0.5.1 255.255.255.0

Router0(config-if )#interface Loopback7

Router0(config-if )#ip address 1.0.6.1 255.255.255.0

Router0(config-if )#interface Loopback8

Router0(config-if )#ip address 1.0.7.1 255.255.255.0

Router0(config-if )#interface Serial1/0

Router0(config-if )#ip address 192.168.1.1 255.255.255.0

Router0(config-if )#No Shut

Router0(config-if )#clock rate 64000

Router0(config-if )#interface Serial1/1

Router0(config-if )#ip address 192.168.0.1 255.255.255.0

Router0(config-if )#No Shut

Router0(config-if )#clock rate 64000

Router0(config-if )#ex

Router0(config)#router eigrp 1

Router0(config)#network 192.168.1.0

Router0(config)#network 192.168.0.0

Router0(config)#network 1.0.0.0

Router0(config)#network 1.0.1.0

Router0(config)#network 1.0.2.0

Router0(config)#network 1.0.3.0

Router0(config)#network 1.0.4.0

Router0(config)#network 1.0.5.0

Router0(config)#network 1.0.6.0

Router0(config)#network 1.0.7.0

Router0(config)#no auto-summary

For Router 1:

Router1>en

Router1#config t

Router1(config)#interface FastEthernet0/0

Router1(config-if )#ip address 198.168.3.1 255.255.255.0

Router1(config-if )#No shut

Router1(config-if )#interface Serial1/0

Router1(config-if )#ip address 192.168.1.2 255.255.255.0

Router1(config-if )#No shut

Router1(config-if )#interface Serial1/1

Router1(config-if )#No shut

Router1(config-if )# ip address 192.168.4.1 255.255.255.0

Router1(config-if )#ex

Router1(config)#router eigrp 1

Router1(config)#network 192.168.1.0 255.255.255.0

Router1(config)#network 192.168.4.0 255.255.255.0

Router1(config)#network 192.168.3.0 255.255.255.0

For Router 2:

Router2>en

Router2#config t

Router2(config)#interface Serial1/0

Router2(config-if )#ip address 192.168.0.2 255.255.255.0

Router2(config-if )# no shut

Router2(config-if )interface Serial1/1

Router2(config-if )ip address 192.168.2.1 255.255.255.0

Router2(config-if )# no shut

Router2(config-if )#clock rate 64000

Router2(config-if )#interface Serial1/2

Router2(config-if )#ip address 192.168.4.2 255.255.255.0

Router2(config-if )#no shut

Router2(config-if )#clock rate 64000

Router2(config-if )#ex

Router2(config)#router eigrp 1

Router2(config)#network 192.168.0.0 0.0.0.255

Router2(config)#network 192.168.4.0 0.0.0.255

Router2(config)# network 192.168.2.0 0.0.0.255

For Router 3:

Router3>en

Router3#config t

Router3(config)#interface Loopback1

Router3(config-if )#ip address 2.0.0.1 255.255.255.0

Router3(config-if )#interface Loopback2

Router3(config-if )#ip address 20.0.0.1 255.255.255.0

Router3(config-if )#interface FastEthernet0/0

Router3(config-if )#ip address 192.168.3.2 255.255.255.0

Router3(config-if )#no shut

Router3(config-if )#interface Serial1/0

Router3(config-if )# ip address 192.168.2.2 255.255.255.0

Router3(config-if )#no shut

Router3(config-if )#ex

Router3(config)#router eigrp 1

Router3(config)#network 192.168.2.0

Router3(config)#network 192.168.3.0

Router3(config)#network 2.0.0.0

Router3(config)#network 20.0.0.0

Router3(config)#no auto-summary

To be noted:

• You can check your EIGRP on every  router through following commands:

               Router3#show ip eigrp ?

                     interfaces  IP-EIGRP interfaces

                     neighbors   IP-EIGRP neighbors

                     topology    IP-EIGRP Topology Table

                     traffic     IP-EIGRP Traffic Statistics

•  May have noticed while configuring EIGRP , In Router0 and Router3 I used just Network addresses with No auto-summary as in RIP-V2,  in Router1 i used subnet mask with network address and in Router2 i used Wild Card Bits as in OSPF routing protocol. This is so because EIGRP can b configured either way.