interface Loopback0 ip address 1.1.1.1 255.255.255.0 ip ospf 1 area 1 ! interface Loopback10 ip address 172.16.10.1 255.255.255.0 ! interface Ethernet0/0 ip address 192.168.12.1 255.255.255.0 ip ospf 1 area 1 ! router ospf 1 area 1 nssa redistribute connected subnets
R2的配置
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interface Loopback0 ip address 2.2.2.2 255.255.255.0 ip ospf 1 area 0 ! interface Ethernet0/0 ip address 192.168.12.2 255.255.255.0 ip ospf 1 area 1 ! interface Ethernet0/1 ip address 192.168.23.2 255.255.255.0 ip ospf 1 area 0 ! router ospf 1 area 1 nssa
R3的配置
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interface Loopback0 ip address 3.3.3.3 255.255.255.0 ip ospf 1 area 0 ! interface Ethernet0/0 ip address 192.168.23.3 255.255.255.0 ip ospf 1 area 0 ! interface Ethernet0/1 ip address 192.168.34.3 255.255.255.0 ip ospf 1 area 2
R4的配置
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interface Loopback0 ip address 4.4.4.4 255.255.255.0 ip ospf 1 area 2 ! interface Ethernet0/1 ip address 192.168.34.4 255.255.255.0 ip ospf 1 area 2
操作和观察
首先观察R4的OSPF路由表
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R4#sh ip route ospf O IA 192.168.12.0/24 [110/30] via 192.168.34.3, 00:16:42, Ethernet0/1 1.0.0.0/32 is subnetted, 1 subnets O IA 1.1.1.1 [110/31] via 192.168.34.3, 00:15:22, Ethernet0/1 2.0.0.0/32 is subnetted, 1 subnets O IA 2.2.2.2 [110/21] via 192.168.34.3, 00:20:37, Ethernet0/1 3.0.0.0/32 is subnetted, 1 subnets O IA 3.3.3.3 [110/11] via 192.168.34.3, 00:20:37, Ethernet0/1 172.16.0.0/24 is subnetted, 1 subnets O E2 172.16.10.0 [110/20] via 192.168.34.3, 00:15:17, Ethernet0/1 O IA 192.168.23.0/24 [110/20] via 192.168.34.3, 00:20:37, Ethernet0/1
R2(config)#router ospf 1 R2(config-router)#area 1 range 1.1.1.1 255.255.255.255 not-advertise
目前我们已经禁止了1.1.1.1这个条目离开区域1了,下面我们去R4上确认一下是不是成功了。
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R4#sh ip route ospf O IA 192.168.12.0/24 [110/30] via 192.168.34.3, 00:19:30, Ethernet0/1 2.0.0.0/32 is subnetted, 1 subnets O IA 2.2.2.2 [110/21] via 192.168.34.3, 00:23:24, Ethernet0/1 3.0.0.0/32 is subnetted, 1 subnets O IA 3.3.3.3 [110/11] via 192.168.34.3, 00:23:24, Ethernet0/1 O IA 192.168.23.0/24 [110/20] via 192.168.34.3, 00:23:24, Ethernet0/1
R4#sh ip ospf database external OSPF Router with ID (4.4.4.4) (Process ID 1) Type-5 AS External Link States LS age: 1186 Options: (No TOS-capability, DC) LS Type: AS External Link Link State ID: 172.16.10.0 (External Network Number ) Advertising Router: 2.2.2.2 LS Seq Number: 80000003 Checksum: 0xE5E5 Length: 36 Network Mask: /24 Metric Type: 2 (Larger than any link state path) TOS: 0 Metric: 20 Forward Address: 1.1.1.1 External Route Tag: 0
R4#sh ip route ospf O IA 192.168.12.0/24 [110/30] via 192.168.34.3, 00:26:19, Ethernet0/1 2.0.0.0/32 is subnetted, 1 subnets O IA 2.2.2.2 [110/21] via 192.168.34.3, 00:30:13, Ethernet0/1 3.0.0.0/32 is subnetted, 1 subnets O IA 3.3.3.3 [110/11] via 192.168.34.3, 00:30:13, Ethernet0/1 172.16.0.0/24 is subnetted, 1 subnets O E2 172.16.10.0 [110/20] via 192.168.34.3, 00:00:36, Ethernet0/1 O IA 192.168.23.0/24 [110/20] via 192.168.34.3, 00:30:13, Ethernet0/1
R4#sh ip ospf database external OSPF Router with ID (4.4.4.4) (Process ID 1) Type-5 AS External Link States Routing Bit Set on this LSA LS age: 88 Options: (No TOS-capability, DC) LS Type: AS External Link Link State ID: 172.16.10.0 (External Network Number ) Advertising Router: 2.2.2.2 LS Seq Number: 80000004 Checksum: 0xB11D Length: 36 Network Mask: /24 Metric Type: 2 (Larger than any link state path) TOS: 0 Metric: 20 Forward Address: 0.0.0.0 External Route Tag: 0