OSPF Single Area

Topology

Objectives

- Perform basic router configuration
- Configure OSPF routing
- Advertise router into OSPF

Configure router R1 interfaces

Router#configure terminal
Router(config)#hostname R1
R1(config)#int f0/0
R1(config-if)#description R1 to Server
R1(config-if)#ip add 148.1.1.254 255.255.0.0
R1(config-if)#no shut
R1(config-if)#exit

R1(config)#int s0/0
R1(config-if)#ip add 1.1.1.1 255.0.0.0
R1(config-if)#description R1 to R2
R1(config-if)#clock rate 64000
R1(config-if)#no shut
R1(config-if)#

Configure OSPF process 1 on router R1

R1#configure terminal
R1(config)#router ospf 1
R1(config-router)#net 148.1.0.0 0.0.255.255 are 0
R1(config-router)#net 1.0.0.0 0.255.255.255 area 0
R1(config-router)#^Z
R1#

To verify R1 routing table, issue the show ip route command

R1#show ip route

Gateway of last resort is not set

C 1.0.0.0/8 is directly connected, Serial0/0
O 2.0.0.0/8 [110/1562] via 1.1.1.2, 00:00:09, Serial0/0
C 148.1.0.0/16 is directly connected, FastEthernet0/0
O 148.2.0.0/16 [110/782] via 1.1.1.2, 00:00:09, Serial0/0
O 148.3.0.0/16 [110/1563] via 1.1.1.2, 00:00:09, Serial0/0
O 148.4.0.0/16 [110/1563] via 1.1.1.2, 00:00:09, Serial0/0
R1#



Configure router R2 interfaces

Router#config t
Router(config)#hostname R2
R2(config)#int s0/0
R2(config-if)#ip add 1.1.1.2 255.0.0.0
R2(config-if)#description R2 to R1
R2(config-if)#no shut
R2(config)#exit

R2(config)#interface s0/1
R2(config-if)#ip add 2.2.2.1 255.0.0.0
R2(config-if)#description R2 ot R3
R2(config-if)#clock rate 64000
R2(config-if)#no shut
R2(config-if)#exit

R2(config)#int f0/0
R2(config-if)#ip add 148.2.2.254 255.255.0.0
R2(config-if)#description R2 t PCA
R2(config-if)#no shut

Configure OSPF routing on R2

R2#configure terminal
R2(config)#router ospf 1
R2(config-router)#net 1.0.0.0 0.255.255.255 area 0
R2(config-router)#net 148.2.0.0 0.0.255.255 area 0
R2(config-router)#net 2.0.0.0 0.255.255.255 area 0
R2(config-router)#

to verify the routing table, run the show ip route on R2

R2#show ip route

C 1.0.0.0/8 is directly connected, Serial0/0
C 2.0.0.0/8 is directly connected, Serial0/1
O 148.1.0.0/16 [110/782] via 1.1.1.1, 00:35:43, Serial0/0
C 148.2.0.0/16 is directly connected, FastEthernet0/0
O 148.3.0.0/16 [110/782] via 2.2.2.2, 00:37:38, Serial0/1
O 148.4.0.0/16 [110/782] via 2.2.2.2, 00:37:38, Serial0/1
R2#


Configure R3 interfaces

Router#conf t
Router(config)#int f0/0
Router(config-if)#description R3 to PCB
Router(config-if)#ip add 148.4.3.254 255.255.0.0
Router(config-if)#no shut

Router(config-if)#int f1/0
Router(config-if)#description R3 to PCC
Router(config-if)#ip add 148.3.3.254 255.255.0.0
Router(config-if)#no shut

Router(config-if)#exit
Router(config)#int s0/1
Router(config-if)#ip add 2.2.2.2 255.0.0.0
Router(config-if)#description R3 to R2
Router(config-if)#no shut

Configure OSPF process 1 on router R3

Router(config-if)#exit
Router(config)#router ospf 1
Router(config-router)#net 2.0.0.0 0.255.255.255 area 0
Router(config-router)#net 148.4.0.0 0.0.255.255 area 0
Router(config-router)#network 148.3.0.0 0.0.255.255 area 0
Router(config-router)#exit
Router#


OSPF routing table verification on R3
Router#show ip route

O 1.0.0.0/8 [110/1562] via 2.2.2.1, 00:47:23, Serial0/1
C 2.0.0.0/8 is directly connected, Serial0/1
O 148.1.0.0/16 [110/1563] via 2.2.2.1, 00:45:21, Serial0/1
O 148.2.0.0/16 [110/782] via 2.2.2.1, 00:47:23, Serial0/1
C 148.3.0.0/16 is directly connected, FastEthernet1/0
C 148.4.0.0/16 is directly connected, FastEthernet0/0
Router#

Now Can you ping between all devices? if Not, verify your configuration step-by-step.

To finish, clear the routers for the next lab