How to configure OSPF in Cisco Router

OSPF is Open Shortest Path First and it is a link state routing protocol. The example of how to configure OSPF in Cisco IOS Routers is shown in the below with the picture together. I hope this example will be benefit for brothers and sisters who are learning Cisco Networking.

Router 1

Activate the connection to PC1
en
config t
int g0/0
ip address 192.168.1.1 255.255.255.0
no shut

 
Activate the connection to Router2
int s0/0/1
ip address 223.200.100.9 255.255.255.252
clock rate 64000
no shut

Activate the connection to Router 3
int s0/0/0
ip address 223.200.100.1 255.255.255.252
no shut
exit

 
Configure OSPF
router ospf 10
network 192.168.1.0 0.0.0.255 area 0
network 223.200.100.0 0.0.0.3 area 0
network 223.200.100.8 0.0.0.3 area 0
end
 

Save the configuration
copy run start
 

Router 2

Activate the connection to PC2
en
config t
int g0/0
ip address 192.168.2.1 255.255.255.0
no shut


Activate the connection to Router 1
int s0/0/1
ip address 223.200.100.10 255.255.255.252
no shut

 
Activate the connection to Router 3
int s0/0/0
ip address 223.200.100.6 255.255.255.252
no shut
exit

Configure OSPF
router ospf 10
network 192.168.2.0 0.0.0.255 area 0
network 223.200.100.8 0.0.0.3 area 0
network 223.200.100.4 0.0.0.3 area 0

end

Save the configuration
copy run start
 

Router 3

Activate the connection to PC3
en
config t
int g0/0
ip address 192.168.3.1 255.255.255.0
no shut
 

Activate the connection to Router 1
int s0/0/0
ip address 223.200.100.2 255.255.255.252
clock rate 64000
no shut

Activate the connection to Router 2
int s0/0/1
ip address 223.200.100.5 255.255.255.252
clock rate 64000
no shut
exit

 
Configure OSPF
router ospf 10
network 192.168.3.0 0.0.0.255 area 0
network 223.200.100.0 0.0.0.3 area 0
network 223.200.100.4 0.0.0.3 area 0
end
 

Save the configuration
copy run start

If you want to do testing in Packet Tracer, please click here to download .pkt file.