Open Shortest Path First (1)
OSPF - developed (1988) for IP networks by IETF ( Internet Engineering Task Force)
interior gateway protocol
based on SPF (shortest path algorithm = Dijkstra algorithm) developed in 1978 for ARPAnet; and a few other research efforts
OSPF characteristics
- link-state routing protocol (link state information is used to calculate the shortest path to each node)
- routers exchange link-state advertisements (LSAs) with all routers within the same hierarchical area
- operates within the same hierarchy of routers; intra-autonomous system (AS - collection of networks under the common administration)