5.4 Stub and Totally Stubby Areas
5.4.5 OSPF totally stubby area configuration example
In the figure, the keyword no-summary has been added to the area stub command on R3. This keyword causes summary routes (delivered by both Type 3 and Type 4 LSAs) to also be blocked from the stub. Each router in the stub picks the closest ABR as a gateway to all other networks outside the area.

The only routes that will appear in R4's routing table are intra-area routes (designated with an O in the routing table) and the default route. No interarea routes (designated with an IA in the routing table) will be included.

Note that it is necessary to configure the no-summary keyword only on the totally stubby border routers, because the area is already configured as stub.