一、实验拓扑：
二、命令部署：
R1(config)#router ospf 110
R1(config-router)#area 1 nssa no-summary 部署完全非纯末节才可以
R3(config)#router ospf 110 R3(config-router)#area 1 nssa no-summary
1、R3、R5部署OSPF Area 35： R3(config)#router ospf 35 R3(config-router)#network 35.1.1.0 0.0.0.255 area 35
R5(config)#router ospf 35 R5(config-router)#network 5.5.5.0 0.0.0.255 area 35 R5(config-router)#network 35.1.1.0 0.0.0.255 area 35
2、R3上重分发 OSPF 35到OSPF 110： R3(config)#router ospf 110 R3(config-router)#redistribute ospf 35 subnets
3、R3上重分发 OSPF 110到OSPF 35： R3(config)#router ospf 35 R3(config-router)#redistribute ospf 110 subnets
4、先把上个实验命令删除： R1(config)#router ospf 110 R1(config-router)#no area 1 nssa no-redistribution 删除重分发路由 R1(config-router)#no area 1 nssa default-information-originate 删除默认路由语句 三、验证： 1、NSSA区域有外部OSPF区域路由条目，其它区域没有： R2#show ip route ospf 1.0.0.0/24 is subnetted, 1 subnets O 1.1.1.0 [110/2] via 12.1.1.1, 00:00:16, FastEthernet0/0 3.0.0.0/32 is subnetted, 1 subnets O IA 3.3.3.3 [110/3] via 12.1.1.1, 00:00:16, FastEthernet0/0 4.0.0.0/32 is subnetted, 1 subnets O 4.4.4.4 [110/2] via 24.1.1.4, 00:00:16, FastEthernet1/0 O 202.100.10.0/24 [110/2] via 12.1.1.1, 00:00:16, FastEthernet0/0 O 202.100.11.0/24 [110/2] via 12.1.1.1, 00:00:16, FastEthernet0/0 13.0.0.0/24 is subnetted, 1 subnets O IA 13.1.1.0 [110/2] via 12.1.1.1, 00:00:16, FastEthernet0/0 O 202.100.8.0/24 [110/2] via 12.1.1.1, 00:00:16, FastEthernet0/0 O 202.100.9.0/24 [110/2] via 12.1.1.1, 00:00:16, FastEthernet0/0
2、反向：R5也没有内部区域的路由条目： R5#show ip route ospf 3.0.0.0/24 is subnetted, 1 subnets O E2 3.3.3.0 [110/1] via 35.1.1.3, 00:10:41, FastEthernet0/0 13.0.0.0/24 is subnetted, 1 subnets O E2 13.1.1.0 [110/1] via 35.1.1.3, 00:10:41, FastEthernet0/0
