Open shortest path first ( ospf ) is one of the routing protocol of internet . originally , it was developed to be the substitute for routing information protocol ( rip ) Ospf ( openshortestpathfirst ,開放最短路徑優先)是internet路由選擇協議的一種,最初是為替代rip協議開發的,目前已成為構建大型網絡最常用的路由選擇協議。