stub area

stub area: An Open Shortest Path First (OSPF) area that does not advertise individual external networks. A stub area blocks external routes and therefore reduces the amount of memory required on the internal routers located in the stub area. To keep the topology database size small, routing to all external networks in a stub area is done through a default route (destination 0.0.0.0 with the subnet mask of 0.0.0.0). In OSPF, any destination that you cannot reach through an intra-area or inter-area router is reachable through the default route.

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