OSPF Single Area Lab

Objective

Configure Open Shortest Path First (OSPF) in a single area (Area 0) to establish connectivity between routers.

Lab Topology

Topology: R1, R2, and R3 connected via serial or ethernet links.

Task 1 – OSPF Configuration on R1

R1(config)# router ospf 1
R1(config-router)# router-id 1.1.1.1
R1(config-router)# network 10.1.1.0 0.0.0.255 area 0
R1(config-router)# network 192.168.12.0 0.0.0.3 area 0

Task 2 – OSPF Configuration on R2

R2(config)# router ospf 1
R2(config-router)# router-id 2.2.2.2
R2(config-router)# network 10.2.2.0 0.0.0.255 area 0
R2(config-router)# network 192.168.12.0 0.0.0.3 area 0
R2(config-router)# network 192.168.23.0 0.0.0.3 area 0

Task 3 – OSPF Configuration on R3

R3(config)# router ospf 1
R3(config-router)# router-id 3.3.3.3
R3(config-router)# network 10.3.3.0 0.0.0.255 area 0
R3(config-router)# network 192.168.23.0 0.0.0.3 area 0

Task 4 – Verification

Verify neighbor adjacencies and routing tables.

R2# show ip ospf neighbor

Neighbor ID     Pri   State           Dead Time   Address         Interface
1.1.1.1           0   FULL/  -        00:00:32    192.168.12.1    Serial0/0/0
3.3.3.3           0   FULL/  -        00:00:39    192.168.23.3    Serial0/0/1

R2# show ip route ospf
     10.0.0.0/24 is subnetted, 3 subnets
O       10.1.1.0 [110/65] via 192.168.12.1, 00:04:12, Serial0/0/0
O       10.3.3.0 [110/65] via 192.168.23.3, 00:03:55, Serial0/0/1