路由基础与静态路由.ppt

实例思考 请大家写出以上拓扑的静态路由表。 A: xdy(config)#ip route xdy(config)# B: C: 课外作业： 1. 静态路由与动态路由比较，有什么优、缺点？ 2. IGRP协议比RIP协议有什么优点？ 3. 要实现一个大型网络的IP路由(六台核心路由器)，应该使用什么路由协议？ * Purpose: This figure introduces students to routing. The router must accomplish the items listed in the figure for routing to occur. Emphasize: Path determination occurs at Layer 3, the network layer. The path determination function enables a router to evaluate the available paths to a destination and to establish the best path. Routing services use network topology information when evaluating network paths. This information can be configured by the network administrator (static routes) or collected through dynamic processes (routing protocols) running in the network. Transition: How do you represent the path to the packet’s destination? * Purpose: This figure explains that routers must learn about paths not directly connected. Emphasize: The router already knows about directly connected networks. It must learn about those networks not connected. This chapter describes how routers learn about those paths. * Purpose: This figure introduces students to static and dynamic routes. Emphasize: Static knowledge is administered manually—A network administrator enters it into the router’s configuration. The administrator must manually update this static route entry whenever an internetwork topology change requires an update. Static knowledge can be private—by default it is not conveyed to other routers as part of an update process. You can, however, configure the router to share this knowledge. Dynamic knowledge works differently. After the network administrator enters configuration commands to start dynamic routing, route knowledge is updated automatically by a routing process. Whenever new topology information is received from the internetwork, routers update neighbors about the route change. * Purpose: This figure describes how a static route operates. Emphasize: For intercommunication, static routes