I'm working on optimizing an OSPF network, and I'm looking at different network types. Here is what I understand:
- Broadcast: Dynamic neighbors; uses multicast; elects DR
- NBMA: Static neighbors; uses unicast; elects DR
- PTP: Single neighbor; uses multicast; does not elect DR
- PTMP: Dynamic neighbors; uses multicast; does not elect DR
How does PTMP maintain efficiency without electing a DR? I assume it uses the "hub", but how does it know what the hub is if everything is on the same subnet?