Point-to-Point

Point-to-Point
A point-to-point environment uses subinterfaces on the physical interface to create point-topoint
connections with other OSPF neighbors. No DR or BDR is elected because the link is
treated as a point-to-point circuit. This allows for faster convergence.
A full mesh is not required when implementing this environment. PVCs on the subinterface
may fail, but there is still OSPF connectivity to other PVCs on the same physical interface.
The drawback of a point-to-point environment is inefficient flooding. Because of multiple
PVCs per interface and depending on the mesh of the PVCs, one LSA update can be flooded
multiple times.
The default Hello interval for point-to-point networks is 10 seconds and the Dead interval
is four times the Hello interval, 40 seconds. To change a network type to point-to-point, enter
the command ip ospf network point-to-point in interface configuration mode for the
selected interface.