NBMA Environments
- Communications between the neighbors is done via unicast, and not multicast.
- This configuration requires a full mesh, and has the same weaknesses as a broadcast environment.
- For NBMA networks, the default Hello interval is 30 seconds.
- The Dead interval is 4x the Hello interval which is 120 seconds.
- NBMA networks also elect a DR and BDR.
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- To enable a router as a DR, set the priority in the OSPF neighbor statement to elect the neighbor as DR:
conf t
router ospf 1
neighbor 1.1.1.1 priority {0 – 255}