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How To Configure OSPF Protocol | Computer Network

To configure OSPF protocol using cisco packet tracer simulation tool.

Algorithm

Step 1: Start – All Programs – cisco packet tracer – cisco packet tracer 5.3.

Step 2: Add the network device such as PC, switch and router in work area.

Step 3: Connect PC to switch using Copper media Straight through Cable in Fast Ethernet port and use serial cable for router to router connection.

Step 4: Apply the IP address and proper subnet mask.

Step 5: Configure OSPF Protocol use the following syntax

Router(config)# router ospf process_ID
Router(config-router)# network IP_address wildcard_mask area area_id

Step 6: After complete configuration send the packet (Add Simple PDU) one network to another network.

Step 7: Check the data flow to the network use real time mode (or) Simulation Mode.

Step 8: Now OSPF protocol was working well. Check the dynamic route and protocol use the command.

R1#show ip route
R1#show ip protocol

Block Diagram

Device Configuration

DEVICEINTERFACEIP ADDRESSSUBNET MASKGATEWAY
PC1Fast Ethernet192.168.1.1255.255.255.0192.168.1.10
PC2Fast Ethernet192.168.1.2255.255.255.0192.168.1.10
PC3Fast Ethernet192.168.2.1255.255.255.0192.168.2.10
PC4Fast Ethernet192.168.3.1255.255.255.0192.168.3.10
PC5Fast Ethernet192.168.4.1255.255.255.0192.168.4.10
PC6Fast Ethernet192.168.4.2255.255.255.0192.168.4.10
R1Fast Ethernet0/0192.168.1.10255.255.255.0N/A
Fast Ethernet1/0192.168.2.10255.255.255.0N/A
Serial 2/011.1.1.1255.255.255.252N/A
R2Serial 2/011.1.1.2255.255.255.252N/A
Serial 3/011.1.1.5255.255.255.252N/A
R3Fast Ethernet0/0192.168.3.10255.255.255.0N/A
Fast Ethernet1/0192.168.4.10255.255.255.0N/A
Serial 3/011.1.1.6255.255.255.252N/A

R1 Configuration

Router>enable
Router# configure terminal

Device Name and Particular interface Configuration

Router(config)#hostname R1
R1(config)#interface FastEthernet0/0
R1(config-if)#no shutdown
R1(config-if)#ip address 192.168.1.10 255.255.255.0
R1(config-if)#exit

R1(config)#interface FastEthernet1/0
R1(config-if)#no shutdown
R1(config-if)#ip address 192.168.2.10 255.255.255.0
R1(config-if)#exit

R1(config)#interface Serial2/0
R1(config-if)#no shutdown
R1(config-if)#clock rate 72000
R1(config-if)#ip address 11.1.1.1 255.255.255.252
R1(config-if)#

OSPF Protocol Configuration Command

R1(config)#router ospf ?
<1-65535>  Process ID
R1(config)#router ospf 7
R1(config-router)#network ?
	A.B.C.D  Network number
R1(config-router)#network 192.168.1.0 ?
	A.B.C.D  OSPF wild card bits
R1(config-router)#network 192.168.1.0 0.0.0.255 ?
area  Set the OSPF area ID
R1(config-router)#network 192.168.1.0 0.0.0.255 area 7
R1(config-router)#network 192.168.2.0 0.0.0.255 area 7
R1(config-router)#network 11.1.1.0 0.0.0.3 area 7
R1(config-router)#

Save the running Configuration file to NVRAM

R1#copy running-config startup-config
Destination filename [startup-config]?
Building configuration...
[OK]
R1#

Verify the OSPF Routing on the Routing Table

R1#show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
       i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
       * - candidate default, U - per-user static route, o - ODR
       P - periodic downloaded static route

Gateway of last resort is not set
     11.0.0.0/30 is subnetted, 2 subnets
C       11.1.1.0 is directly connected, Serial2/0
O       11.1.1.4 [110/128] via 11.1.1.2, 00:04:41, Serial2/0
C    192.168.1.0/24 is directly connected, FastEthernet0/0
C    192.168.2.0/24 is directly connected, FastEthernet1/0
O    192.168.3.0/24 [110/129] via 11.1.1.2, 00:03:36, Serial2/0
O    192.168.4.0/24 [110/129] via 11.1.1.2, 00:03:36, Serial2/0
R1#

R1#show ip protocols

R1#show ip protocols
Routing Protocol is "ospf 7"
  Outgoing update filter list for all interfaces is not set
  Incoming update filter list for all interfaces is not set
  Router ID 192.168.2.10
  Number of areas in this router is 1. 1 normal 0 stub 0 nssa
  Maximum path: 4
  Routing for Networks:
    192.168.1.0 0.0.0.255 area 7
    192.168.2.0 0.0.0.255 area 7
    11.1.1.0 0.0.0.3 area 7
  Routing Information Sources:
    Gateway         Distance      Last Update
    11.1.1.5             110      00:05:18
    192.168.2.10         110      00:06:30
    192.168.4.10         110      00:05:18
  Distance: (default is 110)
R1#

R2 Configuration

Router>enable
Router#configure terminal

Device Name and Particular interface Configuration

Router(config)#hostname R2
R2(config)#interface Serial2/0
R2(config-if)#no shutdown
R2(config-if)#no clock rate
This command applies only to DCE interfaces
R2(config-if)#ip address 11.1.1.2 255.255.255.252
R2(config-if)#exit

R2(config)#interface Serial3/0
R2(config-if)#no shutdown
R2(config-if)#clock rate 72000
R2(config-if)#ip address 11.1.1.5 255.255.255.252
R2(config-if)#exit

OSPF Protocol Configuration Command

R2(config)#router ospf 7
R2(config-router)#network 11.1.1.0 0.0.0.3 area 7
R2(config-router)#network 11.1.1.4 0.0.0.3 area 7
R2(config-router)#

Save the running Configuration file to NVRAM

R2#copy running-config startup-config
Destination filename [startup-config]?
Building configuration...
[OK]

Verify the OSPF Routing on the Routing Table

R2#show ip route
R2#show ip protocols

R3 Configuration

Router>enable
Router#configure terminal

Device Name and Particular interface Configuration

Router(config)#hostname R3
R3(config)#interface FastEthernet0/0
R3(config-if)#no shutdown
R3(config-if)#ip address 192.168.3.10 255.255.255.0
R3(config-if)#exit

R3(config)#interface FastEthernet1/0
R3(config-if)#no shutdown
R3(config-if)#ip address 192.168.4.10 255.255.255.0
R3(config-if)#exit

R3(config)#interface Serial3/0
R3(config-if)#no shutdown
R3(config-if)#no clock rate
This command applies only to DCE interfaces
R3(config-if)#ip address 11.1.1.6 255.255.255.252
R3(config-if)#exit

OSPF Protocol Configuration Command

R3(config)#router ospf 7
R3(config-router)#network 192.168.3.0 0.0.0.255 area 7
R3(config-router)#network 192.168.4.0 0.0.0.255 area 7
R3(config-router)#network 11.1.1.4 0.0.0.3 area 7
R3(config-router)#

Save the running Configuration file to NVRAM

R3#copy running-config startup-config
Destination filename [startup-config]?
Building configuration...
[OK]
R3#

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