To configure OSPF for IPv4, follow the steps below:
1. Enable OSPF: Enable OSPF on the router by entering the router ospf process-id command in global configuration mode. Replace process-id with a unique number to identify this OSPF process on the router.
1. Configure Router ID: Set up the Router ID by entering the router-id command followed by the IP address of the interface you want to use as the OSPF Router ID.
1. Assign Router Interfaces: Identify which interfaces are to be included in OSPF by entering the command network network-address wildcard-mask area area-id in interface configuration mode. This command identifies the interfaces that are connected to networks that will be advertised by OSPF.
1. Alocate a Cost: Assign costs to interfaces with the command ip ospf cost cost. The cost is a metric that indicates the cost of sending data over a particular link. Make sure to assign a lower cost to faster interfaces and a higher cost to slower interfaces.
1. Identify OSPF neighbors: Verify that the routers are neighbors by entering the command show ip ospf neighbor. It is important to verify the adjacency state before configuring routing policies.
1. Establish Route Preferences: Configure route preferences with the network command to insert routes into the OSPF database. The network command is used to advertise the network addresses of directly connected networks but also distributes other routes discovered by the router.
1. Verify OSPF Configuration: Verify that OSPF is functioning correctly by entering the commands show ip route ospf and show ip ospf neighbor. These commands will provide meaningful insight into the operation of OSPF routing.
Overall, with these steps, you can successfully configure OSPF for IPv4.
