Point-to-multipoint Mode Characteristics of the RFC-compliant point-to-multipoint parameter include: Used with partial-mesh or hub-and-spoke (star) topology. One IP subnet. DR and BDR not required. Uses multicast OSPF hello packets to dy...
http://www.ebrahma.com/2013/10/point-to-multipoint-mode-point-to-multipoint-non-broadcast-mode-in-ospf/Labels: hub-and-spoke, multicast-OSPF, OSPF, Partial-Mesh, Point-to-multipoint-Mode, Point-to-multipoint-Mode-