Configuring Summarization on an Area Border Router.

Configuring Summarization on an Area Border Router. 

Perforing Network Setup Using GNS 3

On R1

NOTE: We are Creating the loopback interfaces to simulate different networks connected to Router 1

R1(config)#interface Loopback1

R1(config-if)#ip address 172.16.1.1 255.255.255.0

R1(config)#interface Loopback2

R1(config)# ip address 172.16.2.1 255.255.255.0

R1(config-if)#interface Loopback3

R1(config-if)# ip address 172.16.3.1 255.255.255.0

R1(config)#interface Loopback4

R1(config-if)#ip address 172.16.4.1 255.255.255.0

R1(config)#interface s0/0

R1(config-if)#ip address 10.1.1.1 255.255.255.0

//We are Configuring the the OSPF Routing Protocol on R1

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R1 (config)#router ospf 1

R1(config-router)# router-id 1.1.1.1

R1(config-router)#  network 10.1.1.1 0.0.0.0 area 0

R1(config-router)#  network 172.16.1.1 0.0.0.0 area 0

R1(config-router)#  network 172.16.2.1 0.0.0.0 area 0

R1(config-router)#  network 172.16.3.1 0.0.0.0 area 0

R1(config-router)#  network 172.16.4.1 0.0.0.0 area 0

R1(config-router)#end

On R3

//Configuring the Loopback interfaces to simulate different networks on Router 3

R1(config)#interface Loopback1

R1(config-if)#ip address 172.17.1.1 255.255.255.0

R1(config)#interface Loopback2

R1(config)# ip address 172.17.2.1 255.255.255.0

R1(config-if)#interface Loopback3

R1(config-if)# ip address 172.17.3.1 255.255.255.0

R1(config)#interface Loopback4

R1(config-if)#ip address 172.17.4.1 255.255.255.0

R1(config)#interface s0/0

R1(config-if)#ip address 192.168.1.2 255.255.255.0

//Configuring the OSPF Routing Protocol on R1

R1 (config)#router ospf 1

R1(config-router)# router-id 3.3.3.3

R1(config-router)#  network 192.168.1.2 0.0.0.0 area 0

R1(config-router)#  network 172.17.1.1 0.0.0.0 area 0

R1(config-router)#  network 172.17.2.1 0.0.0.0 area 0

R1(config-router)#  network 172.17.3.1 0.0.0.0 area 0

R1(config-router)#  network 172.17.4.1 0.0.0.0 area 0

R1(config-router)#end

On R2

R2(config)# interface Serial0/0

 R2(config-if)# ip address 10.1.1.2 255.255.255.0

 R2(config-if)# clock rate 2000000

R2(config)# interface Serial0/1

R2(config-if)# ip address 192.168.1.1 255.255.255.0

R2(config-if)# clock rate 2000000

R2(config)#router ospf 1
R2(config-router)# router-id 2.2.2.2
R2(config-router)# network 10.1.1.2 0.0.0.0 area 0
R2(config-router)# network 192.168.1.1 0.0.0.0 area 1
R2(config-router)# area 0 range 172.16.0.0 255.255.248.0
R2(config-router)# area 1 range 172.17.0.0 255.255.248.0

 NOTE: The last 2 statements allows the Router 3 also known as the ABR (Area Border Router) to perform summarization to Routers on Both Areas that is Area 0 and Area 1

NOTE: Please make sure you have already the Submnetting,VLSM and Summarization Basics

After that verify by going on R1 and R3 to see the summarized routes by using the command

**show ip route 

Cheers 

************************************Enjoy***************************************