Content

| 6.7 |  | Stub, Totally Stubby, and Not-So-Stubby Areas |
| 6.7.5 |  | OSPF totally stubby area configuration example |

In 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 on the routing table for R4 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.

Notice 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.

| Lab Activity e-Lab Activity: OSPF Totally Stubby Area Configuration Example In this lab, configure an OSPF area to be a totally stubby area.