OSPF is a pnk-state routing protocol。It is designed to be run internal to a single （71）system。Each OSPF router maintains an identical （）describing the autonomous system’s topology。From this database，a routing table is calcpated by constructing a shortest-path （）。OSPF recalcpates routes quickly in the face of topological changes，utipzing a minimum of routing （） traffic。OSPF provides support for equal-cost mptipath。An area routing capabipty is provided，enabpng an additional level of routing protection and a reduction in routing protocol （）。