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4.4.2. Point-to-Point Networks
On point-to-point links (serial, point-to-point subinterfaces), OSPF doesn't elect a DR/BDR. Both routers form full adjacencies directly.
Router(config)# interface GigabitEthernet0/1
Router(config-if)# ip ospf network point-to-point
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Written byAlvin Varughese
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