The Open Shortest Path First (OSPF) protocol is one of the most complex routing protocols that can be deployed in modern networks. As opposed to EIGRP, OSPF is an open-standard protocol.
OSPF is a classless routing protocol and this allows it to support VLSM. Similar to EIGRP using DUAL, OSPF uses the SPF (Dijkstra) algorithm to select loop-free paths throughout the topology. OSPF is designed to be very scalable because it is a hierarchical routing protocol, using the concept of “areas” to split the topology into smaller sections.
OSPF may not converge as fast as EIGRP does but . . .
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