Must all the devices on an OSPF NBMA network be fully meshed

All the devices on an OSPF Non-Boadcast Multi-Access (NBMA) network do not need to be fully meshed. Only the designated router (DR), backup designated router (BDR), and all the neighbors need to be reachable by IP address. Though DR election is not definite, you can set the priority of another device to 0 to prevent the interface from being elected as DR. For a robust network, it is recommended that all the devices on an NBMA network be fully meshed.

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