OSPF classifies networks into several types according to link-layer protocols. The network type should be correctly configured to prevent the fault that OSPF packets cannot be transmitted normally.
OSPF classifies networks into four types according to link layer protocols. By configuring network types for interfaces, you can change the network types of interfaces.
The NBMA network cannot discover neighboring routers through Hello packets. Therefore, you need to manually set the IP address of the neighboring router and specify the election priority to establish the neighbor relationship.
On both broadcast and NBMA networks, you can configure the DR priorities of OSPF interfaces to impact the DR/BDR election. In common cases, the router with high performance and reliability is selected as the DR/BDR.