By Denise Donohue
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5. OSPF supports five network types: ■ NBMA—Default for multipoint serial interfaces. RFC-compliant mode that uses DRs and requires manual neighbor configuration. ■ Point-to–multipoint (P2MP)—Doesn’t use DRs so adjacencies increase logarithmically with routers. Resilient RFC compliant mode that automatically discovers neighbors. Chapter 3: OSPF Point-to-multipoint nonbroadcast (P2MNB)—Proprietary mode that is used on Layer 2 facilities where dynamic neighbor discovery is not supported. Requires manual neighbor configuration.
It is an example of many services existing on one device. A load balancer, which makes many servers look like one, is an example of one service residing on many devices. VRFs are an example of taking one resource and making it look like many. Some versions of IOS are capable of having a router present itself as many virtual router (VRF) instances, allowing your company to deliver different logical topologies on the same physical infrastructure. Server virtualization is Chapter 1: The Evolving Network Model  another example.
To limit routing information even more, an area can be made totally stubby using the no-summary keyword on the ABR only. In that case, all interarea and external routes are dropped by the ABR and replaced by a default route. The default route starts with a cost of 1; to change it, use the area default-cost command. The example that follows shows area 2 configured as a totally stubby area, and the default route injected with a cost of 5: Router(config-router)#area 2 stub no-summary Router(config-router)#area 2 default-cost 5 Stub areas are attractive because of their low overhead.