l4-Part 3: Configure and Verify the Advertising of a Default Route

In this part, you will configure a default static route to the internet on R1. R1 will then propagate the default route to other OSPF routers as an external Type 2 OSPF route (i.e., O*E2).

Propagating a default is the most efficient method to provide a consistent default gateway to all OSPF- enabled devices.

Step 1: Configure default route advertisement on R1. 

a.     R1 will be the gateway of last resort for the OSPF internetwork. In our sample topology, the internet is simulated using the Lo0 interface. Configure a static default route out of the Lo0 interface on R1.

Open configuration window

Note: Disregard the informational message. In a production environment, a valid physical interface would be used to provide default gateway services.

b.    Enter OSPF router configuration mode and use the default-information originate [always] [metric metric-value] [metric-type type-value] command to enable default route propagation. The always keyword advertises a default route even if a static default route does not exist while the route metric and metric type can be changed. R1 is configured to propagate the default route.

Step 2: Verify the default route advertisement.

a.     Verify the routing table on R1.

b.    Verify the routing table on D1 and D2.