OSPF

In Cisco Packet Tracer, OSPF (Open Shortest Path First) is a dynamic routing protocol used to determine the best path for routing IP packets within a network. It is commonly used in enterprise networks to facilitate efficient and scalable routing. 

To use OSPF in Cisco Packet Tracer, follow these steps:

Step 1:
Create a network topology Build the network topology by adding routers and connecting them with appropriate interfaces. Ensure that the routers are interconnected in a way that forms a network where OSPF will be enabled.

Step 2:
Enable OSPF on routers Access the configuration interface of each router by either double-clicking on it or selecting it and clicking on "CLI" (Command Line Interface) on the toolbar. In the CLI window, enter the following commands:

Router> Enable

Router# Configure terminal

Router(config)# Router OSPF Process-id

Here is an example of OSPF on 2 Routers

Router 1:

Ena

Conf t

Router ospf 1

Network 192.168.10.0 0.0.0.255 area 0

No shutdown (this saves the config)

Router 2:

Ena

Conf t

Router ospf 1

Network 192.168.10.0 0.0.0.255 area 0

No shutdown

To view OSPF neighbor information on Router 1:

SQL

Show IP OSPF neighbor

To view OSPF protocol information on Router 1:

SQL

Show IP protocols

Please note that for OSPF to establish adjacency and exchange routing information, the routers must be directly connected and their OSPF configurations should be consistent, including the network addresses and area IDs. Also, make sure to replace the 192.168.10.0 with the appropriate network address for your network.

Once the OSPF configurations are completed on both routers, you can use the show ip ospf neighbor command to verify the establishment of OSPF neighbor relationships between the routers. The show ip protocols command will provide information about OSPF process and network details.

Remember to save the configurations on each router and ensure the physical and logical connectivity between the routers to facilitate successful OSPF operation.