OSPF is a standards-based link-state protocol that is based on the SPF algorithm for best path calculation. OSPF was initially designed for networks of point-to-point links and was later adapted for operation in LAN and NBMA environments. OSPF can be used on dialup links with the OSPF Demand Circuit feature, which suppresses the Hello protocol.
The OSPF hierarchical area requirements impose design constraints in larger networks. One backbone area is required, and all nonbackbone areas must be directly attached to that backbone area. Expansion of the backbone area can cause design issues because the backbone area must remain contiguous.
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