OSPF assumes that all routers can communicate directly using multicast, and that no router is uniquely positioned. Routers on an Ethernet segment can communicate directly, however NBMA (None Broadcast Multi Access) network types are not able to.
The following are OSPF network types configurable on a Cisco interface:
- Broadcast multiaccess
- Point-to-point
- Point-to-multipoint
- None Broadcast Multiaccess (NBMA)
On NMBA networks multicast communications are simulated by sending advertisements directly to each neighbour.
Point-to-point or Ethernet networks are automatically detected
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