OSPF network point-to-point is the default option for point-to-point interfaces
such as HDLC, PPP, or point-to-point NBMA subinterfaces. It uses multicast
hellos, does not use the DR/BDR election, and only supports the adjacency of
exactly two neighbors on a segment. No special design considerations need to
be taken into account for point-to-point OSPF interfaces
To note;
Network type Point-to-Multipoint
OSPF network type point-to-multipoint is specifically designed to solve
To note;
- Unicats Hellos
Network type Point-to-Multipoint
OSPF network type point-to-multipoint is specifically designed to solve
reachability problems in partially meshed NBMA network designs. Unlike network
type point-to-point, it sends hellos as multicasts. And does not support the
DR/BDR election. Unlike point-to-point however, multiple adjacencies on a
single interface are supported.
To note;
OSPF network type point-to-multipoint non-broadcast is essentially the same as
network type point-to-multipoint, with one exception. Point-to-multipoint network
type uses multicast hellos, while point-to-multipoint non-broadcast uses unicast
hellos. Both do not support the DR/BDR election.
To note;
- Multicast Hellos to 224.0.0.5
- In a Hub-Spoke design
- Hub - needs mapping to all spokes with BROADCAST key word - to enable reachability to all the spokes
- Spoke - needs a map ONLY to the HUB with BROADCAST key word - to enable reachability to all the spokes via the HUB.
OSPF network type point-to-multipoint non-broadcast is essentially the same as
network type point-to-multipoint, with one exception. Point-to-multipoint network
type uses multicast hellos, while point-to-multipoint non-broadcast uses unicast
hellos. Both do not support the DR/BDR election.
