1、第8章 路由選擇基礎(chǔ),主要內(nèi)容,討論路由選擇協(xié)議和被路由協(xié)議，如何解決路由選擇問題,To route a router need to know: Destination addresses Sources it can learn from Possible routes Best route Maintain and verify routing information,8.1 What is Routing?,172.16.1.0,10.120.2.0,What is Routing? (cont.),NetworkProtocol,DestinationNetwork,Connecte

2、dLearned,10.120.2.0172.16.1.0,Exit Interface,E0S0,Routed Protocol: IP,Routers must learn destinations that are not directly connected,172.16.1.0,10.120.2.0,E0,S0,建立路由表,8.2 What is a Routing Protocol?,Routing protocols are used between routers to determine paths and maintain routing tables. Once the

3、path is determined a router can route a routed protocol.,NetworkProtocol,DestinationNetwork,ConnectedRIPIGRP,10.120.2.0172.16.2.0172.17.3.0,Exit Interface,E0S0S1,Routed Protocol: IPRouting protocol: RIP, IGRP,172.17.3.0,172.16.1.0,10.120.2.0,E0,S0,Autonomous System 100,Autonomous System 200,IGPs: RI

4、P, IGRP,EGPs: BGP,Autonomous Systems: Interior or Exterior Routing Protocols,An autonomous system is a collection of networks under a common administrative domain IGPs operate within an autonomous system EGPs connect different autonomous systems,Classes of Routing Protocols,Distance Vector,Hybrid Routing,Link State,C,B,A,D,C,D,B,A,Route protocol: RIP IGRP EIGRP OSPF,Routed protocol: