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NSSA区域多台ABR时做7-5类LSA转换的情况及此类LSA的路由选择拓扑R1和R2均为area0和nssaarea1间的ABR，R3和R4均为nssaarea1的ASBR；R3和R4上都配置了四条主机静态路由指向R5，并在ospf里重分发。实验一R1与R3之间不做连接，R1学到了E1类型路由，说明R2作为ABR，进行了7/5类LSA转换R1#shipospfneighborOSPFprocess1:NeighborIDPriStateDeadTimeAddressInterface3.1.1.11Full/DR00:00:381.1.1.2fastethernet0R1#shiproutefe1：2.1.1.1/24fe0：1.1.1.1/24fe0：1.1.1.2/24Nssaarea1R1R2R3R4Area010.1.1.1/3211.1.1.1/3212.1.1.1/3213.1.1.1/32R5fe1：2.1.1.1/24fe1：3.1.1.1/24ge1：3.1.1.2/24ge0：4.1.1.2/24fe0：4.1.1.1/24fe1：2.1.1.2/24ge3：6.1.1.1/24sw0：5.1.1.1/24Codes:C-connected,S-static,R-RIP,O-OSPF,OE-OSPFExternal,M-ManagementD-Redirect,E-IRMP,EX-IRMPexternal,o-SNSP,B-BGP,i-ISISGatewayoflastresortisnotsetC1.1.1.0/24isdirectlyconnected,00:00:50,fastethernet0O3.1.1.0/24[110/2]via1.1.1.2,00:00:04,fastethernet0O4.1.1.0/24[110/3]via1.1.1.2,00:00:04,fastethernet0C127.0.0.0/8isdirectlyconnected,01:05:03,lo0OE10.1.1.1/32[150/23]via1.1.1.2,00:00:03,fastethernet0OE11.1.1.1/32[150/23]via1.1.1.2,00:00:03,fastethernet0OE12.1.1.1/32[150/23]via1.1.1.2,00:00:03,fastethernet0OE13.1.1.1/32[150/23]via1.1.1.2,00:00:03,fastethernet0R1#shipospfrouteOSPFprocess1:Codes:C-connected,D-Discard,O-OSPF,IA-OSPFinterareaN1-OSPFNSSAexternaltype1,N2-OSPFNSSAexternaltype2E1-OSPFexternaltype1,E2-OSPFexternaltype2O*1.1.1.0/24[1]isdirectlyconnected,fastethernet0,Area0IA*3.1.1.0/24[2]via1.1.1.2,fastethernet0,Area0IA*4.1.1.0/24[3]via1.1.1.2,fastethernet0,Area0E1*10.1.1.1/32[23]via1.1.1.2,fastethernet0E1*11.1.1.1/32[23]via1.1.1.2,fastethernet0E1*12.1.1.1/32[23]via1.1.1.2,fastethernet0E1*13.1.1.1/32[23]via1.1.1.2,fastethernet0R1#shipospfdatabaseOSPFRouterwithID(1.1.1.1)(ProcessID1)RouterLinkStates(Area0)LinkIDADVRouterAgeSeq#CkSumLinkcount1.1.1.11.1.1.115920x800000080xef2b13.1.1.13.1.1.1390x8000000a0xd63a1NetLinkStates(Area0)LinkIDADVRouterAgeSeq#CkSum1.1.1.23.1.1.1390x800000070x8d91SummaryLinkStates(Area0)LinkIDADVRouterAgeSeq#CkSumRoute3.1.1.03.1.1.116650x800000060x1b113.1.1.0/244.1.1.03.1.1.16730x800000050x1a114.1.1.0/24ASBR-SummaryLinkStates(Area0)LinkIDADVRouterAgeSeq#CkSum4.1.1.13.1.1.113180x800000050x02274.1.1.23.1.1.111000x800000060xeb3cASExternalLinkStatesLinkIDADVRouterAgeSeq#CkSumRoute10.1.1.13.1.1.13440x800000070xb945E110.1.1.1/32[0x0]11.1.1.13.1.1.13440x800000080xaa52E111.1.1.1/32[0x0]12.1.1.13.1.1.13440x800000070x9f5dE112.1.1.1/32[0x0]13.1.1.13.1.1.12800x800000080x9e5bE113.1.1.1/32[0x0]R1#shipospfdatabaseexternalOSPFRouterwithID(1.1.1.1)(ProcessID1)ASExternalLinkStatesLSage:332Options:0x22(-|-|DC|-|-|-|E|-)LSType:AS-external-LSALinkStateID:10.1.1.1(ExternalNetworkNumber)AdvertisingRouter:3.1.1.1LSSeqNumber:80000007Checksum:0xb945Length:36NetworkMask:/32MetricType:1TOS:0Metric:20ForwardAddress:4.1.1.1ExternalRouteTag:0LSage:332Options:0x22(-|-|DC|-|-|-|E|-)LSType:AS-external-LSALinkStateID:11.1.1.1(ExternalNetworkNumber)AdvertisingRouter:3.1.1.1LSSeqNumber:80000008Checksum:0xaa52Length:36NetworkMask:/32MetricType:1TOS:0Metric:20ForwardAddress:4.1.1.1ExternalRouteTag:0LSage:332Options:0x22(-|-|DC|-|-|-|E|-)LSType:AS-external-LSALinkStateID:12.1.1.1(ExternalNetworkNumber)AdvertisingRouter:3.1.1.1LSSeqNumber:80000007Checksum:0x9f5dLength:36NetworkMask:/32MetricType:1TOS:0Metric:20ForwardAddress:4.1.1.1ExternalRouteTag:0LSage:268Options:0x22(-|-|DC|-|-|-|E|-)LSType:AS-external-LSALinkStateID:13.1.1.1(ExternalNetworkNumber)AdvertisingRouter:3.1.1.1LSSeqNumber:80000008Checksum:0x9e5bLength:36NetworkMask:/32MetricType:1TOS:0Metric:20ForwardAddress:4.1.1.2ExternalRouteTag:0R1#shipospfdaR1#shipospfdatabaseOSPFRouterwithID(1.1.1.1)(ProcessID1)RouterLinkStates(Area0)LinkIDADVRouterAgeSeq#CkSumLinkcount1.1.1.11.1.1.115920x800000080xef2b13.1.1.13.1.1.1390x8000000a0xd63a1NetLinkStates(Area0)LinkIDADVRouterAgeSeq#CkSum1.1.1.23.1.1.1390x800000070x8d91SummaryLinkStates(Area0)LinkIDADVRouterAgeSeq#CkSumRoute3.1.1.03.1.1.116650x800000060x1b113.1.1.0/244.1.1.03.1.1.16730x800000050x1a114.1.1.0/24ASBR-SummaryLinkStates(Area0)LinkIDADVRouterAgeSeq#CkSum4.1.1.13.1.1.113180x800000050x02274.1.1.23.1.1.111000x800000060xeb3cASExternalLinkStatesLinkIDADVRouterAgeSeq#CkSumRoute10.1.1.13.1.1.13440x800000070xb945E110.1.1.1/32[0x0]11.1.1.13.1.1.13440x800000080xaa52E111.1.1.1/32[0x0]12.1.1.13.1.1.13440x800000070x9f5dE112.1.1.1/32[0x0]13.1.1.13.1.1.12800x800000080x9e5bE113.1.1.1/32[0x0]R1#shipospfdatabaseexR1#shipospfdatabaseexternalOSPFRouterwithID(1.1.1.1)(ProcessID1)ASExternalLinkStatesLSage:385Options:0x22(-|-|DC|-|-|-|E|-)LSType:AS-external-LSALinkStateID:10.1.1.1(ExternalNetworkNumber)AdvertisingRouter:3.1.1.1LSSeqNumber:80000007Checksum:0xb945Length:36NetworkMask:/32MetricType:1TOS:0Metric:20ForwardAddress:4.1.1.1ExternalRouteTag:0LSage:385Options:0x22(-|-|DC|-|-|-|E|-)LSType:AS-external-LSALinkStateID:11.1.1.1(ExternalNetworkNumber)AdvertisingRouter:3.1.1.1LSSeqNumber:80000008Checksum:0xaa52Length:36NetworkMask:/32MetricType:1TOS:0Metric:20ForwardAddress:4.1.1.1ExternalRouteTag:0LSage:10Options:0x22(-|-|DC|-|-|-|E|-)LSType:AS-external-LSALinkStateID:12.1.1.1(ExternalNetworkNumber)AdvertisingRouter:3.1.1.