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1、ospf网络的宣告ospf中network命令是连续执行的，第二条network命令只可能影响那些哥第一条network不匹配的接口。比如说，下面的这个例子，我们首先把ABR配置成正确的，Network172.16..192.00.0.0.248area1network172.。16.113.00.0.0.255a0查看r1的路由表：r1#shiprouteCodes:C-connected,S-static,R-RIP,M-mobile,B-BGPD-EIGRP,EX-EIGRPexternal,O-OSPF,IA-OSPFintera
2、reaN1-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-periodicdownloadedstaticrouteGatewayoflastresortisnotset17
3、2.16.0.0/16isvariablysubnetted,4subnets,2masksC172.16.192.0/29isdirectlyconnected,Ethernet0/0OIA172.16.113.12/30[110/74]via172.16.192.6,00:20:25,Ethernet0/0OIA172.16.113.8/30[110/138]via172.16.192.6,00:13:36,Ethernet0/0OIA172.16.113.16/30[110/74]via172.16.192.6,00:20:25,E
4、thernet0/0路由都学到了：Ping一把;:r1#ping172.16.113.9Typeescapesequencetoabort.Sending5,100-byteICMPEchosto172.16.113.9,timeoutis2seconds:!!!!!Successrateis100percent(5/5),round-tripmin/avg/max=20/68/124msr1#ping172.16.113.10Typeescapesequencetoabort.Sending5,100-byteICMPEchosto17
5、2.16.113.10,timeoutis2seconds:!!!!!Successrateis100percent(5/5),round-tripmin/avg/max=12/52/112ms可以平通，网络正常然后，我们改动ABR的ospf的配置，将网络宣告为：Network172.16..0.00.0.0255.255area1network172.。16.113.00.0.0.255a0注意两者的先后关系先看ABR的另据关系：r5#shiposneiNeighborIDPriStateDeadTimeAddressInterface
6、1.1.1.21FULL/DR00:00:38172.16.192.5Ethernet0/01.1.1.31FULL/BDR00:00:34172.16.192.4Ethernet0/01.1.1.412WAY/DROTHER00:00:34172.16.192.3Ethernet0/0看到没，只有只有r1，r2，r3这三个邻居了再看，r1的路由条目，，#r1#shiprouteCodes:C-connected,S-static,R-RIP,M-mobile,B-BGPD-EIGRP,EX-EIGRPexternal,O-OSPF,IA
7、-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-periodicdownloadedstaticrouteGatewayoflastresor
8、tisnotset172.16.0.0/16isvariablysubnetted,3subnets,2masksC172.16.192.0/29isdirectlyconnected,Eth
