网络优化资源1-2008ccna实验chp4rip

4动态路由协议包括距离向量路由协议和链路状态路由协议。RIP（RoutingInformationProtocols，路由信息协议）是使用最广泛的距离向量路由协议。RIPRIP4-1RIPv1RIPv2区VLSM实验1：RIPv1基本配R1(config)#router//启动RIP1//配置RIPR2(config)#router1R3(config)#router1R4(config)#router14.实验调(1)showipR1#showipCodes:C-connected,S-static,R-RIP,M-mobile,B-D-EIGRP,EX-EIGRPexternal,O-OSPF,IA-OSPFinterareaN1-OSPFNSSAexternaltype1,N2-OSPFNSSAexternaltype2E1-OSPFexternaltype1,E2-OSPFexternaltype2i-IS-IS,su-IS-ISsummary,L1-IS-ISlevel-1,L2-IS-ISlevel-2ia-IS-ISinterarea,*-candidatedefault,U-per-userstaticrouteo-ODR,P-periodicdownloadedstaticrouteGatewayoflastresortisnot 192.168.12.0/24isdirectlyconnected,Serial0/0/01.0.0.0/24issubnetted,1subnets 1.1.1.0isdirectlyconnected, 4.0.0.0/8[120/3]via192.168.12.2,00:00:03, 192.168.23.0/24[120/1]via192.168.12.2,00:00:03,Serial0/0/0 192.168.34.0/24[120/2]via192.168.12.2,00:00:03,⑤⑦showipR1#showip【注意RoutingProtocolis//路由器上运行的路由协议是OutgoingupdatefilterlistforallinterfacesisnotingupdatefilterlistforallinterfacesisnotSendingupdatesevery30seconds,nextduein23【注意为了防止更新同步,RIP15%的误差发送更新,即实际发送更新的周期的范围是25.5-30秒。Invalidafter180seconds,holddown180,flushedafter【技术要点 4.0.0.0/8ispossiblydown,routingvia192.168.12.2, 秒【提示R1(config-router)#timersbasicupdateinvalidholddownRedistributing:Defaultversioncontrol:sendversion1,receiveversionRecvTriggeredRIPKey-1111Automaticnetworksummarizationisinumpath:【提示R1(config-router)#um-pathsnumber-Routingfor//以上三行表明RIPRoutingInformationLast//distance：管理//lastupdate：更新发生在多长时间以前Distance:(defaultis120)debugipR1#cleariproute*R1#debugipripFeb912:43:13.311:RIP:sendingrequestonSerial0/0/0to912:43:13.315:sendingrequestonLoopback0to912:43:13.323:receivedv1updatefrom192.168.12.2on94.0.0.0in39192.168.23.0in19192.168.34.0in2Feb912:43:15.311:RIP:sendingv1flashupdateto255.255.255.255viaLoopback0(1.1.1.1)Feb912:43:15.311:RIP:buildflashupdateentriesFeb9 network4.0.0.0metricFeb9 network192.168.12.0metricFeb9 network192.168.23.0metricFeb9 network192.168.34.0metric 912:43:15.311:RIP:sendingv1flashupdateto255.255.255.255viaSerial0/0/0Feb912:43:15.311:RIP:buildflashupdateentriesFeb912:43:15.311: network1.0.0.0metric1通过以上输出，可以看到RIPv1采用广播更新（255.255.255.255）,分别向Loopback0和s0/0/0发送路由更新，同时从s0/0/0接收三条路由更新，分别是4.0.0.0，度量值是3跳；192.168.34.0,度量值是2跳；192.168.23.0，度量值是1跳。【技术要点flashupdate（闪式更新）指的是当网络上某个路径的度量值发生变化，路由器立即实验2:接口与单播更拓扑结图4-2配置接由于以太口g0/0和g0/1连接主机，不需要向这些接口发送路由更新，所以可以考虑将路由器的该接口设置为接口。步骤1：配置路由器R1R1(config)#routerripR1(config-router)#passive-interface步骤2：配置路由器R2R2(config)#routerripR1#debugipripR1#cleariproute*Feb913:24:41.275:RIP:sendingrequestonSerial0/0/0to255.255.255.255Feb913:24:41.283:RIP:receivedv1updatefrom192.168.12.2onSerial0/0/0Feb913:24:41.283: 2.0.0.0in1hops 913:24:43.275:RIP:sendingv1flashupdateto255.255.255.255viaSerial0/0/0Feb913:24:43.275:RIP:buildflashupdate9network10.0.0.0metric9network172.16.0.0metric【技术要点【实例用单播更新，为指定的相邻路由器R3R1具体的配置如下：R1(config)#routerR1(config-router)#neighbor172.16.1.34-3实验3：使用子网地址实验目步骤1：配置路由器R1R1(config)#routerrip步骤2：配置路由器R2R2(config)#routerripR1#showipCodes:C-connected,S-static,R-RIP,M-mobile,B-D-EIGRP,EX-EIGRPexternal,O-OSPF,IA-OSPFinterareaN1-OSPFNSSAexternaltype1,N2-OSPFNSSAexternaltype2E1-OSPFexternaltype1,E2-OSPFexternaltype2i-IS-IS,su-IS-ISsummary,L1-IS-ISlevel-1,L2-IS-ISlevel-2ia-IS-ISinterarea,*-candidatedefault,U-per-userstaticrouteo-ODR,P-periodicdownloadedstaticrouteGatewayoflastresortisnot172.16.0.0/24issubnetted,3172.16.1.0isdirectlyconnected,Loopback0 172.16.2.0isdirectlyconnected,Serial0/0/0 172.16.3.0[120/1]via172.16.2.2,00:00:03,R2#showipCodes:C-connected,S-static,R-RIP,M-mobile,B--EIGRP,EX-EIGRPexternal,O-OSPF,IA-OSPFinterareaN1-OSPFNSSAexternaltype1,N2-OSPFNSSAexternaltype2E1-OSPFexternaltype1,E2-OSPFexternaltype2i-IS-IS,su-IS-ISsummary,L1-IS-ISlevel-1,L2-IS-ISlevel-2ia-IS-ISinterarea,*-candidatedefault,U-per-userstaticrouteo-ODR,P-periodicdownloadedstaticrouteGatewayoflastresortisnot172.16.0.0/24issubnetted,3 172.16.1.0[120/1]via172.16.2.1,00:00:21, 172.16.2.0isdirectlyconnected,Serial0/0/0 172.16.3.0isdirectlyconnected,Loopback0可以说明，某些情况下RIPv1更新确实可以携带子网信息。【技术要点【思考R2#showipCodes:C-connected,S-static,R-RIP,M-mobile,B-D-EIGRP,EX-EIGRPexternal,O-OSPF,IA-OSPFinterareaN1-OSPFNSSAexternaltype1,N2-OSPFNSSAexternaltype2E1-OSPFexternaltype1,E2-OSPFexternaltype2i-IS-IS,su-IS-ISsummary,L1-IS-ISlevel-1,L2-IS-ISlevel-2ia-IS-ISinterarea,*-candidatedefault,U-per-userstaticrouteo-ODR,P-periodicdownloadedstaticrouteGatewayoflastresortisnot172.16.0.0/16isvariablysubnetted,3subnets,2 172.16.1.0/25[120/1]via172.16.2.1,00:00:17,172.16.2.0/25isdirectlyconnected,Serial0/0/0 172.16.3.0/24isdirectlyconnected,Loopback0实验4：RIPv2基本配步骤1：配置路由器R1R1(config)#routerrip步骤2：配置路由器R2R2(config)#routerripR2(config-router)#noauto-summary步骤3：配置路由器R3R3(config)#routerripR3(config-router)#noauto-summary步骤4：配置路由器R4R4(config)#routerrip(1)showipR1#showipCodes:C-connected,S-static,R-RIP,M-mobile,B--EIGRP,EX-EIGRPexternal,O-OSPF,IA-OSPFinterareaN1-OSPFNSSAexternaltype1,N2-OSPFNSSAexternaltype2E1-OSPFexternaltype1,E2-OSPFexternaltype2i-IS-IS,su-IS-ISsummary,L1-IS-ISlevel-1,L2-IS-ISlevel-2ia-IS-ISinterarea,*-candidatedefault,U-per-userstaticrouteo-ODR,P-periodicdownloadedstaticrouteGatewayoflastresortisnot 192.168.12.0/24isdirectlyconnected,Serial0/0/01.0.0.0/24issubnetted,1subnets 1.1.1.0isdirectlyconnected,Loopback04.0.0.0/8isvariablysubnetted,2subnets,2masks 4.4.4.0/24[120/3]via192.168.12.2,00:00:22,Serial0/0/0 192.168.23.0/24[120/1]via192.168.12.2,00:00:22,Serial0/0/0 192.168.34.0/24[120/2]via192.168.12.2,00:00:22,从上面输出的路由条目“4.4.4.0/24”，可以看RIPv2路由更新是携带子网信息的（2）showipprotocolsR1#showipprotocolsRoutingProtocolis"rip"OutgoingupdatefilterlistforallinterfacesisnotsetingupdatefilterlistforallinterfacesisnotSendingupdatesevery30seconds,nextduein19secondsInvalidafter180seconds,holddown180,flushedafter240Redistributing:ripDefaultversioncontrol:sendversion2,receiveversionRecvTriggeredRIPKey-2222【提示可以通过命令“ipripsendversion”和“ipripreceiveversion”来控制在路由器接口上接收和发送的版本，例如在s0/0/0接口上接收版本1和2的路由更新，但是只发送版本2的路由更新，配置如下：R1(config-if)#ipripsendversion2R1(config-if)#ipripreceiveversion1【注意但是如果在接口上配置了“ipripreceiveversion121Automaticnetworksummarizationisnotineffectumpath:4RoutingforRoutingInformationLastDistance:(defaultis实验5：RIPv2手工汇R4(config)#routerripR4(config-router)#version2R4(config-router)#noauto-summaryR4(config)#interfaces0/0/0R4(config-if)#ip ddressrip4.4.0.0255.255.252.0//RIP手工路R1#showipCodes:C-connected,S-static,R-RIP,M-mobile,B-D-EIGRP,EX-EIGRPexternal,O-OSPF,IA-OSPFinterareaN1-OSPFNSSAexternaltype1,N2-OSPFNSSAexternaltype2E1-OSPFexternaltype1,E2-OSPFexternaltype2i-IS-IS,su-IS-ISsummary,L1-IS-ISlevel-1,L2-IS-ISlevel-2ia-IS-ISinterarea,*-candidatedefault,U-per-userstaticrouteo-ODR,P-periodicdownloadedstaticrouteGatewayoflastresortisnot 192.168.12.0/24isdirectlyconnected,Serial0/0/01.0.0.0/24issubnetted,1subnets 1.1.1.0isdirectlyconnected,Loopback04.0.0.0/24issubnetted,4subnets 4.4.0.0[120/3]via192.168.12.2,00:00:21, 4.4.1.0[120/3]via192.168.12.2,00:00:21, 4.4.2.0[120/3]via192.168.12.2,00:00:12, 4.4.3.0[120/3]via192.168.12.2,00:00:05, 192.168.23.0/24[120/1]via192.168.12.2,00:00:21,Serial0/0/0 192.168.34.0/24[120/2]via192.168.12.2,00:00:22,R1#showipCodes:C-connected,S-static,R-RIP,M-mobile,B-D-EIGRP,EX-EIGRPexternal,O-OSPF,IA-OSPFinterareaN1-OSPFNSSAexternaltype1,N2-OSPFNSSAexternaltype2E1-OSPFexternaltype1,E2-OSPFexternaltype2i-IS-IS,su-IS-ISsummary,L1-IS-ISlevel-1,L2-IS-ISlevel-2ia-IS-ISinterarea,*-candidatedefault,U-per-userstaticrouteo-ODR,P-periodicdownloadedstaticrouteGatewayoflastresortisnot 192.168.12.0/24isdirectlyconnected,Serial0/0/01.0.0.0/24issubnetted,1subnets 1.1.1.0isdirectlyconnected,Loopback04.0.0.0/22issubnetted,1subnets 4.4.0.0[120/3]via192.168.12.2,00:00:21, 192.168.23.0/24[120/1]via192.168.12.2,00:00:21,Serial0/0/0 192.168.34.0/24[120/2]via192.168.12.2,00:00:22,现在将路由器R4上四个环回接口lo0-lo4的地址分别修改为R4(config-if)#routerR4(config-if)#ipddressrip192.168.96.0“SummarymaskmustbegreaterorequaltomajorR4(config)#iproute192.168.96.0255.255.252.0R4(config)#routerR4(config-router)#redistribute R1#showipCodes:C-connected,S-static,R-RIP,M-mobile,B-D-EIGRP,EX-EIGRPexternal,O-OSPF,IA-OSPFinterareaN1-OSPFNSSAexternaltype1,N2-OSPFNSSAexternaltype2E1-OSPFexternaltype1,E2-OSPFexternaltype2i-IS-IS,L1-IS-ISlevel-1,L2-IS-ISlevel-2,ia-IS-ISinter*-candidatedefault,U-per-userstaticroute,o-ODRP-periodicdownloadedstaticrouteGatewayoflastresortisnotC192.168.12.0/24isdirectlyconnected,Serial0/0/01.0.0.0/24issubnetted,1subnetsC1.1.1.0isdirectlyconnected,R192.168.23.0/24[120/1]via192.168.12.2,00:00:18,Serial0/0/0R192.168.34.0/24[120/2]via192.168.12.2,00:00:18,Serial0/0/0R192.168.96.0/22[120/3]via192.168.12.2,00:00:18,Serial0/0/0实验6：RIPv2认证和触发更步骤1：配置路由器R1R1(config)#keychaintest//配置链R1(config-keychain)#key1//配置KEY R1(config)#interfaceR1(config-if)#ipripauthenticationmodeR1(config-if)#ipripauthenticationkey-chaintest//在接口上调用链R1(config-if)#ipriptriggered 2：配置路由R2R2(config)#keychaintestR2(config-keychain)#key1R2(config)#interfaces0/0/0R2(config-if)#ipripR2(config-if)#ipripauthenticationkey-chaintestR2(config-if)#interfaces0/0/1R2(config-if)#ipripauthenticationkey-chaintestR2(config-if)#ipriptriggered3：配置路由R3R3(config)#keychaintestR3(config-keychain)#key1R3(config)#interfaces0/0/0R3(config-if)#ipripauthenticationkey-chaintestR3(config-if)#ipriptriggeredR3(config-if)#ipripauthenticationkey-chaintestR3(config-if)#ipriptriggered4：配置路由R4R4(config)#keychaintestR4(config-keychain)#key1R4(config)#interfaces0/0/0R4(config-if)#ipripauthenticationkey-chaintestR4(config-if)#ipriptriggeredshowipprotocolsR2#showipprotocolsRoutingProtocolis"rip"OutgoingupdatefilterlistforallinterfacesisnotsetingupdatefilterlistforallinterfacesisnotSendingupdatesevery30seconds,nextduein4secondsInvalidafter180seconds,holddown0,flushedafter240Redistributing:ripDefaultversioncontrol:sendversion2,receiveversionTriggeredKey-2222Automaticnetworksummarizationisnotineffectumpath:4RoutingforRoutingInformationLastDistance:(defaultisdebugipR2#debugipRIPprotocoldebuggingisonR2#cleariproute**Feb1113:51:31.827:RIP:sendingtriggeredrequestonSerial0/0/0to*Feb1113:51:31.831:RIP:sendingtriggeredrequestonSerial0/0/1to*Feb1113:51:31.843:RIP:sendingtriggeredrequestonSerial0/0/0to*Feb1113:51:31.847:RIP:sendingtriggeredrequestonSerial0/0/1to*Feb1113:51:31.847:RIP:sendv2triggeredflushupdateto192.168.12.1onSerial0/0/0withnoroute*Feb1113:51:31.851:RIP:startretransmittimerof*Feb1113:51:31.855:RIP:sendv2triggeredflushupdateto192.168.23.3onSerial0/0/1withnoroute*Feb1113:51:31.855:RIP:startretransmittimerof*Feb1113:51:32.019:RIP:receivedpacketwithtextauthentication*Feb1113:51:32.019:RIP:receivedv2triggeredupdatefrom192.168.12.1on*Feb1113:51:32.023:RIP:sendingv2ackto192.168.12.1viaSerial0/0/0flush,seq#*Feb11 1.1.1.0/24via0.0.0.0in1*Feb1113:51:32.031:RIP:receivedpacketwithtextauthentication*Feb1113:51:32.035:RIP:receivedv2triggeredupdatefrom192.168.23.3on*Feb1113:51:32.035:RIP:sendingv2ackto192.168.23.3viaSerial0/0/1(192.168.23.2),flush,seq#2*Feb11 192.168.34.0/24via0.0.0.0in1*Feb11 4.4.4.0/24via0.0.0.0in2*Feb1113:51:32.071:RIP:receivedpacketwithtextauthentication*Feb1113:51:32.071:RIP:receivedv2triggeredupdatefrom192.168.23.3on*Feb1113:51:32.071:RIP:sendingv2ackto192.168.23.3viaSerial0/0/1(192.168.23.2),flush,seq#3*Feb11 192.168.34.0/24via0.0.0.0in1*Feb11 4.4.4.0/24via0.0.0.0in2*Feb1113:51:32.083:RIP:receivedpacketwithtextauthentication*Feb1113:51:32.083:RIP:receivedv2triggeredackfrom192.168.23.3onSerial0/0/1flushseq#2*Feb1113:51:32.087:RIP:sendv2triggeredupdateto192.168.23.3on*Feb1113:51:32.087:RIP:buildupdate*Feb11 route176:192.168.12.0/24metric1,tag*Feb11 route181:1.1.1.0/24metric2,tag*Feb1113:51:32.095:RIP:Updatecontains2routes,start176,end*Feb1113:51:32.095:RIP:startretransmittimerof*Feb1113:51:32.099:RIP:receivedpacketwithtextauthentication*Feb1113:51:32.099:RIP:receivedv2triggeredupdatefrom192.168.12.1on*Feb1113:51:32.103:RIP:sendingv2ackto192.168.12.1viaSerial0/0/0flush,seq#*Feb11 1.1.1.0/24via0.0.0.0in1*Feb1113:51:32.107:RIP:receivedpacketwithtextauthentication*Feb1113:51:32.111:RIP:receivedv2triggeredackfrom192.168.12.1onSerial0/0/0flushseq#3*Feb1113:51:32.111:RIP:sendv2triggeredupdateto192.168.12.1on*Feb1113:51:32.115:RIP:buildupdate*Feb11 route178:192.168.23.0/24metric1,tag*Feb11 route184:192.168.34.0/24metric2,tag*Feb11 route187:4.4.4.0/24metric3,tag*Feb1113:51:32.123:RIP:Updatecontains3routes,start178,end*Feb1113:51:32.123:RIP:startretransmittimerof*Feb1113:51:32.263:RIP:receivedpacketwithtextauthentication*Feb1113:51:32.263:RIP:receivedv2triggeredackfrom192.168.23.3onSerial0/0/1seq#3*Feb1113:51:32.267:RIP:receivedpacketwithtextauthentication*Feb1113:51:32.271:RIP:receivedv2triggeredackfrom192.168.12.1onSerial0/0/0seq#4从上面的输出可以看出，在路由器R2上，虽然我们打开了debugiprip，但是由于采路由更新。而且所有的更新中都有“triggered”的字样，同时在接收的更新中带和showipripdatabaseR2#showipripdatabase1.0.0.0/8auto-summaryvia192.168.12.1,00:12:22(permanent),Triggered-[1]via192.168.12.1,Serial0/0/04.0.0.0/8auto-summaryvia192.168.23.3,00:12:22(permanent),Triggered-[2]via192.168.23.3,directlyconnected,directlyconnected,[1]via192.168.23.3,00:12:22(permanent),Triggered-[1]via192.168.23.3,showR2#showrun|beginrouterriprouterripversiontimersbasic301800network192.168.12.0noauto-summaryR1(config)#keychaintest//定义R1(config)#interfaces0/0/0R1(config-if)#ipripauthenticationmodemd5MD5R1(config-if)#ipripauthenticationkey-chaintest*Feb1114:04:36.851:RIP:sendingtriggeredrequestonSerial0/0/0to*Feb1114:04:36.855:RIP:sendingtriggeredrequestonSerial0/0/1to*Feb1114:04:36.867:RIP:sendingtriggeredrequestonSerial0/0/0to*Feb1114:04:36.871:RIP:sendingtriggeredrequestonSerial0/0/1to*Feb1114:04:36.871:RIP:sendv2triggeredflushupdateto192.168.12.1onSerial0/0/0withnoroute*Feb1114:04:36.875:RIP:startretransmittimerof*Feb1114:04:36.875:RIP:sendv2triggeredflushupdateto192.168.23.3onSerial0/0/1withnoroute*Feb1114:04:36.879:RIP:startretransmittimerof*Feb1114:04:36.927:RIP:receivedpacketwithMD5*Feb1114:04:36.931:RIP:receivedv2triggeredupdatefrom192.168.23.3on*Feb1114:04:36.931:RIP:sendingv2ackto192.168.23.3viaSerial0/0/1flush,seq#*Feb11 192.168.34.0/24via0.0.0.0in1*Feb11 4.4.4.0/24via0.0.0.0in2*Feb1114:04:36.947:RIP:receivedpacketwithMD5*Feb1114:04:36.947:RIP:receivedv2triggeredupdatefrom192.168.12.1on*Feb1114:04:36.951:RIP:sendingv2ackto192.168.12.1viaSerial0/0/0flush,seq#*Feb11 1.1.1.0/24via0.0.0.0in1*Feb1114:04:36.959:RIP:receivedpacketwithMD5*Feb1114:04:36.959:RIP:receivedv2triggeredupdatefrom192.168.12.1on*Feb1114:04:36.963:RIP:sendingv2ackto192.168.12.1viaSerial0/0/0flush,seq#*Feb11 1.1.1.0/24via0.0.0.0in1*Feb1114:04:36.967:RIP:receivedpacketwithMD5*Feb1114:04:36.971:RIP:receivedv2triggeredackfrom192.168.12.1onSerial0/0/0flushseq#5*Feb1114:04:36.971:RIP:sendv2triggeredupdateto192.168.12.1on*Feb1114:04:36.975:RIP:buildupdate*Feb11 route191:192.168.23.0/24metric1,tag*Feb11 route194:192.168.34.0/24metric2,tag*Feb11 route197:4.4.4.0/24metric3,tag*Feb1114:04:36.983:RIP:Updatecontains3routes,start191,end*Feb1114:04:36.983:RIP:startretransmittimerof*Feb1114:04:36.991:RIP:receivedpacketwithMD5*Feb1114:04:36.991:RIP:receivedv2triggeredupdatefrom192.168.23.3on*Feb1114:04:36.991:RIP:sendingv2ackto192.168.23.3viaSerial0/0/1flush,seq#*Feb11 192.168.34.0/24via0.0.0.0in1*Feb11 4.4.4.0/24via0.0.0.0in2*Feb1114:04:37.003:RIP:receivedpacketwithMD5*Feb1114:04:37.003:RIP:receivedv2triggeredackfrom192.168.23.3onSerial0/0/1flushseq#4*Feb1114:04:37.007:RIP:sendv2triggeredupdateto192.168.23.3on*Feb1114:04:37.007:RIP:buildupdate*Feb11 route189:192.168.12.0/24metric1,tag*Feb11 route200:1.1.1.0/24metric2,tag*Feb1114:04:37.015:RIP:Updatecontains2routes,start189,end*Feb1114:04:37.019:RIP:startretransmittimerof*Feb1114:04:37.059:RIP:receivedpacketwithMD5*Feb1114:04:37.059:RIP:receivedv2triggeredackfrom192.168.12.1onSerial0/0/0seq#6*Feb1114:04:37.067:RIP:receivedpacketwithMD5*Feb1114:04:37.071:RIP:receivedv2triggeredackfrom192.168.23.3onSerial0/0/1seq#5【技术要点不携带KeyID接收方会和所有KeyChain【1携带KeyID接收方首先会查找是否有相同的KeyID，如果有，只匹配一次，决定认证是否【2路由器R2有一个KeyID,key2=cisco根据上面的原则，R1认证失败，R2认证成功实验7：浮动静态路由GatewayoflastGatewayoflastresortisnotR1(config)#iproute2.2.2.0255.255.255.0192.168.12.2R1(config)#routerripR1(config-router)#version2R2(config)#iproute1.1.1.0255.255.255.0192.168.12.1R2(config)#routerripR2(config-router)#noauto-summaryR1#showipCodes:C-connected,S-static,R-RIP,M-mobile,B-D-EIGRP,EX-EIGRPexternal,O-OSPF,IA-OSPFinterareaN1-OSPFNSSAexternaltype1,N2-OSPFNSSAexternaltype2E1-OSPFexternaltype1,E2-OSPFexternaltype2i-IS-IS,su-IS-ISsummary,L1-IS-ISlevel-1,L2-IS-ISlevel-2ia-IS-ISinterarea,*-candidatedefault,U-per-userstaticrouteo-ODR,P-periodicdownloadedstaticroute 192.168.12.0/24isdirectlyconnected,Serial0/0/01.0.0.0/24issubnetted,1subnets 1.1.1.0isdirectlyconnected,Loopback02.0.0.0/24issubnetted,1subnets 2.2.2.0[120/1]via192.168.21.2,00:00:25,GigabitEthernet0/0 192.168.21.0/24isdirectlyconnected,GigabitEthernet0/0小于在静态路由中设定的130，而静态路由处于备份的地位。R1(config)#interfacegigabitEthernet0/0R1#showipCodes:C-connected,S-static,R-RIP,M-mobile,B-D-EIGRP,EX-EIGRPexternal,O-OSPF,IA-OSPFinterareaN1-OSPFNSSAexternaltype1,N2-OSPFNSSAexternaltype2E1-OSPFexternaltype1,E2-OSPFexternaltype2i-IS-IS,su-IS-ISsummary,L1-IS-ISlevel-1,L2-IS-ISlevel-2ia-IS-ISinterarea,*-candidatedefault,U-per-userstaticrouteo-ODR,P-periodicdownloadedstaticrouteGatewayoflastresortisnot 192.168.12.0/24isdirectlyconnected,Serial0/0/01.0.