OSPF_7类LSA转发地址分析

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1、OSPF7类LSA转发地址分析：以上图为例进行分析：分析的前提均将lo0设为了router-id，没做额外的修改。（1）、首先分析RT2的lo0没有通告进Area2，E3/0、E3/1、E3/2、E3/3口通告进了Area2，RT6的E3/0、E3/1、E3/2、E3/3口通告进了Area2，lo0通告进Area0RT6#showipospfdatabasenssa-externalOSPFRouterwithID(6.6.6.6)(ProcessID1)Type-7ASExternalLinkStates(Area2)LSage:23Options:(NoTOS-capability,NoT

2、ype7/5translation,DC)LSType:ASExternalLinkLinkStateID:0.0.0.0(ExternalNetworkNumber)AdvertisingRouter:6.6.6.6LSSeqNumber:80000001Checksum:0x6221Length:36NetworkMask:/0MetricType:2(Largerthananylinkstatepath)TOS:0Metric:1ForwardAddress:10.2.9.1ExternalRouteTag:0LSage:22Options:(NoTOS-capability,Type7

3、/5translation,DC)LSType:ASExternalLinkLinkStateID:4.4.4.4(ExternalNetworkNumber)AdvertisingRouter:2.2.2.2LSSeqNumber:80000001Checksum:0xAA74Length:36NetworkMask:/32MetricType:1(Comparabledirectlytolinkstatemetric)TOS:0Metric:1000ForwardAddress:10.2.5.1ExternalRouteTag:0LSage:23Options:(NoTOS-capabil

4、ity,Type7/5translation,DC)LSType:ASExternalLinkLinkStateID:172.16.4.0(ExternalNetworkNumber)AdvertisingRouter:2.2.2.2LSSeqNumber:80000001Checksum:0xB1BCLength:36NetworkMask:/24MetricType:1(Comparabledirectlytolinkstatemetric)TOS:0Metric:1000ForwardAddress:10.2.5.1ExternalRouteTag:0RT6#在这种情况下，转发地址选择的

5、是通告进Area2来的业务网段中最大的一个地址作为转发地址。（2）将业务网段全部改为重发布，而非直接参与OSPF进程，以外部路由的形式进入OSPF进程。RT6#showipospfdatabasenssa-externalOSPFRouterwithID(6.6.6.6)(ProcessID1)Type-7ASExternalLinkStates(Area2)LSage:34Options:(NoTOS-capability,NoType7/5translation,DC)LSType:ASExternalLinkLinkStateID:0.0.0.0(ExternalNetworkNumbe

6、r)AdvertisingRouter:6.6.6.6LSSeqNumber:80000001Checksum:0x4E23Length:36NetworkMask:/0MetricType:2(Largerthananylinkstatepath)TOS:0Metric:1ForwardAddress:10.2.26.2ExternalRouteTag:0LSage:37Options:(NoTOS-capability,NoType7/5translation,DC)LSType:ASExternalLinkLinkStateID:10.2.9.0(ExternalNetworkNumbe

7、r)AdvertisingRouter:6.6.6.6LSSeqNumber:80000001Checksum:0xF3ALength:36NetworkMask:/24MetricType:2(Largerthananylinkstatepath)TOS:0Metric:20ForwardAddress:10.2.26.2ExternalRouteTag:0RoutingBitSetonthis