OSPF Network Types

A review of the different network types and behaviour of ospf :

NBMA : default for frame-relay physical and point-to-multipoint subinterface
Broadcast :default for ethernet
Point-to-Point : default for point-to-point subinterface


Remark : When using Pt-to-Mpt the next hop is the adjacent router and not the originating router as in Nbma or Broadcast networks

Tips :
Point-to-x : no DR/BDR
Non-broadcast : manual neighbor