RFC 2328 OSPF Version 2
OSPF was designed specifically as an IP routing protocol for use within autonomous systems. As such, it cannot transport datagrams of other routable network protocols such as IPX or AppleTalk. OSPF calculates routes based on the destination IP address found in IP datagram headers; and no provisions are made for calculating routes to non-IP destinations. Additionally, the various OSPF messages are encapsulated directly in IP: No other protocols (TCP, UDP, and so on) are needed for delivery.
OSPF was also designed to quickly detect topological changes in the autonomous system and converge on a new consensus of the topology after detecting a change. Routing decisions are based on the state of the links interconnecting the ...
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