Configuring Per Interface OSPF in Cisco

A routing technique called OSPF (Open Shortest Path First) is used in computer networks to choose the optimum route for packet forwarding. As a link-state routing protocol, OSPF determines the shortest path between any two nodes using knowledge on the network topology, including the condition and price of network links.

In order to divide the network into more manageable sections, OSPF employs an area-based architecture. The routers, networks, and links within each region are listed in the corresponding OSPF database for that area. All other areas are connected via the backbone area, which also acts as the hub for all network routing.

The Dijkstra shortest path first (SPF) method is used by OSPF to determine the optimum path between any two network nodes. The shortest path is determined by the SPF method, which also considers network topology and link costs.

Only authorized routers can participate in the network, thanks to OSPF’s capability for authentication. The authentication methods supported by OSPF include plaintext, MD5, and SHA.

On a Cisco router, perform the following actions to configure OSPF per interface:

Step 1: Go into global configuration mode.

enable Router
config terminal

Step 2: Using the router ospf command and a process ID, enable OSPF on the router.

Step 3: Using the network command, provide the network the interface is a part of, followed by the network address and wildcard mask.

Step 4: Use the ip ospf command to configure OSPF on the interface, providing the process ID and area number.

Step 5: For each interface you want to enable OSPF on, repeat Step 4 and Step 5.

Step 6: Use the following command to examine the OSPF configuration: