OSPF in Broadcast and Non-broadcast Networks
In broadcast multiple-access networks, neighbor adjacency is formed dynamically using multicast hello packets to 224.0.0.5. A DR and BDR are elected normally, and function normally.
For non-broadcast multiple-access networks (NBMA), RFC 2328 defined the following two official modes for OSPF:
- nonbroadcast
- point-to-multipoint
Cisco has defined the following three additional modes for OSPF in NBMA topologies:
- point-to-multipoint nonbroadcast
- broadcast
- point-to-point
Read more about this topic: Open Shortest Path First
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