乾颐堂CCNAv3.0Ender204426777ImplementinganEIGRP-BasedSolution乾颐堂CCNAv3.0Ender204426777DynamicRoutingProtocolsAdynamicroutingprotocolhasthesepurposes:•Thediscoveryofremotenetworks•Maintainingup-to-dateroutinginformation•Choosingthebestpathtodestinationnetworks•Theabilitytofindanewbestpathifthecurrentpathisnolongeravailable©2013CiscoSystems,Inc.-3乾颐堂CCNAv3.0Ender204426777DynamicRoutingProtocols(Cont.)Differentprotocolsbehavedifferently:•IGPversusEGP•Distancevectorvs.linkstate•Classlessvs.classful©2013CiscoSystems,Inc.-4乾颐堂CCNAv3.0Ender204426777AdministrativeDistance•Multipleroutingprotocolsandstaticroutescanbeusedatthesametime.•Routerschoosetheroutingsourcewiththelowestadministrativedistance.如果掩码相同，路由器选择较低的AD值的协议得到的路由©2013CiscoSystems,Inc.-5乾颐堂CCNAv3.0Ender204426777EIGRPFeatures•Rapidconvergence•Loadbalancing•Loop-free,classlessrouting•Reducedbandwidthusage–Boundedupdates（有限的、部分更新）–Nobroadcast(组播更新)©2013CiscoSystems,Inc.-6乾颐堂CCNAv3.0Ender204426777EIGRPPathSelection©2013CiscoSystems,Inc.-7乾颐堂CCNAv3.0Ender204426777EIGRPPathSelection(Cont.)©2013CiscoSystems,Inc.-8乾颐堂CCNAv3.0Ender204426777EIGRPMetric•EIGRPusestwocriteria,bydefault,tocalculateitsmetric:–Bandwidth–Delay•Optionally,EIGRPcanusethesecriteriawhencalculatingitsmetric(notrecommended):–Reliability–Load©2013CiscoSystems,Inc.-9乾颐堂CCNAv3.0Ender204426777EIGRPMetric(Cont.)HQ#showinterfacesserial0/0/0Serial0/0/0isup,lineprotocolisdownHardwareisGT96KSerialDescription:LinktoBranchMTU1500bytes,BW1544Kbit/sec,DLY20000usec,reliability255/255,txload1/255,rxload1/255•VerifiestheEIGRPmetricvaluesontheSerial0/0/0interfaceofrouterHQ©2013CiscoSystems,Inc.0乾颐堂CCNAv3.0Ender204426777EIGRPConfigurationBranch(config)#routereigrp100Branch(config-router)#network10.1.1.0Branch(config-router)#network192.168.1.0HQ(config)#routereigrp100HQ(config-router)#network172.16.1.00.0.0.255HQ(config-router)#network192.168.1.00.0.0.255•Conf...
