2.7.1 Packet Tracer - Single-Area OSPFv2 Configuration

Introduction

This tutorial provides a step-by-step guide for configuring Single-Area OSPFv2 in Cisco Packet Tracer. Open Shortest Path First (OSPF) is a popular routing protocol used in IP networks. This guide is designed for those studying for the CCNA certification and aims to help you understand and implement OSPF in a simulated environment.

Step 1: Set Up the Network Topology

1. Open Cisco Packet Tracer.
2. Create the following devices:
   • 2 Routers (e.g., Router0 and Router1)
   • 2 PCs (PC0 and PC1) connected to each router.
3. Connect the devices using appropriate cables:
   • Use straight-through cables for connecting routers to PCs.
   • Use serial cables for inter-router connections.

Step 2: Configure Basic Router Settings

1. Access Router0 and enter the CLI mode.

2. Set the hostname:

   Router0> enable
   Router0# configure terminal
   Router0(config)# hostname Router0
   

3. Assign IP addresses to each interface:

   • For Router0:

     Router0(config)# interface GigabitEthernet0/0
     Router0(config-if)# ip address 192.168.1.1 255.255.255.0
     Router0(config-if)# no shutdown
     Router0(config-if)# exit
     
     Router0(config)# interface Serial0/0/0
     Router0(config-if)# ip address 10.0.0.1 255.255.255.252
     Router0(config-if)# no shutdown
     Router0(config-if)# exit
     

4. For Router1, repeat the process:

   • Set the hostname to Router1.
   • Assign IP addresses:

   Router1(config)# interface GigabitEthernet0/0
   Router1(config-if)# ip address 192.168.2.1 255.255.255.0
   Router1(config-if)# no shutdown
   Router1(config-if)# exit
   
   Router1(config)# interface Serial0/0/0
   Router1(config-if)# ip address 10.0.0.2 255.255.255.252
   Router1(config-if)# no shutdown
   Router1(config-if)# exit
   

Step 3: Enable OSPF on the Routers

1. On Router0, enter OSPF configuration mode:

   Router0(config)# router ospf 1
   Router0(config-router)# network 192.168.1.0 0.0.0.255 area 0
   Router0(config-router)# network 10.0.0.0 0.0.0.3 area 0
   

2. On Router1, perform the same steps:

   Router1(config)# router ospf 1
   Router1(config-router)# network 192.168.2.0 0.0.0.255 area 0
   Router1(config-router)# network 10.0.0.0 0.0.0.3 area 0
   

Step 4: Verify OSPF Configuration

1. Use the show ip route command on both routers to see the OSPF routes:

   Router0# show ip route
   Router1# show ip route
   

2. Check OSPF neighbors to ensure routers can communicate:

   Router0# show ip ospf neighbor
   Router1# show ip ospf neighbor
   

Step 5: Test Connectivity

1. From PC0, ping PC1 to test connectivity:

   • Open the command prompt on PC0 and run:

   ping 192.168.2.2
   

2. If the pings are successful, OSPF is functioning correctly.

Conclusion

In this tutorial, you learned how to configure Single-Area OSPFv2 in Cisco Packet Tracer. You set up the network topology, configured router settings, enabled OSPF, verified the configurations, and tested connectivity. Next steps may include exploring multi-area OSPF configurations or experimenting with advanced OSPF features like route summarization and authentication.