OSPF Protocol Configuration
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OSPF (Open Shortest Path First):
OSPF Open Shortest Path First is a link-state routing
protocol that was developed in 1991. In 1998, The current version of
OSPF for IPv4 is OSPFv2 introduced in RFC 1247 and updated in RFC 2328
by John Moy. In 1999, OSPFv3 for IPv6 was published in RFC 2740.
OSPF was developed as a replacement for the distance
vector routing protocol RIP. It operates as a classless routing
protocol that uses the concept of areas for network scalability. RFC 2328 defines the OSPF metric as an arbitrary value called cost. The Cisco IOS uses bandwidth as the OSPF cost metric.
OSPF's major advantages over RIP are its fast convergence and its scalability to much larger network implementations.
OSPF has a default administrative distance of 110. As a
classless routing protocol, it does not use a Transport layer protocol,
as OSPF packets are sent directly over IP. 
