NBMA Environments
Point-to-Point
- Here, you may use sub-interfaces on physical interfaces to create point-to-point connections with other OSPF neighbors.
- No DR/BDR is elected since the link is a PPP link. This allows for faster convergence.
- A full mesh isn’t required here.
- On some sub-interfaces, PVC’s will fail, while on others, they may not, but the OSPF will still be running.
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- The limitation with this method is inefficient LSA flooding because of several PVC’s per interface; and depending on the PVC mesh, one LSA update can be flooded multiple times.