【實驗拓撲】

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【實驗基本配置】 1、按照上圖配置相應接口以及OSPF
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【實驗要求】

1、配置Area 1 為NSSA區域 2、在R6上配置1條靜態路由160.1.60.0/24指向 Null0，并充分發到OSPF中 3、將路由器1的ID修改為150.1.100.100

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? 【實驗分析】

• 次末節區域（NSSA）定義：不接受本自治域系統（OSPF網絡）之外的路由，但是他允許引入類型7的LSA的外部路由，并將特定的類型7的LSA路由轉換為來威脅5的LSA。
• 什么情況下使用次末節區域：例如下圖中，區域1中的路由器沒有足夠的性能處理OSPF時，該怎么辦？我們可以把區域1配置為末節區域或次末節區域，來減少OSPF路由器的負擔，但這樣會出現1個問題，RIP將無法通告到OSPF中。此時利用次末節區域能夠很好的解決這一問題。
• 配置次末節區域時注意事項，必須在該區域中的所有路由器上進行配置，否則該區域中的路由器將無法達到毗鄰狀態。

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【實驗配置】 R1,R4,R6: router ospf 1 area 1 nssa R6: ip route 160.1.60.0 255.255.255.0 Null0 router ospf 1 redistribute static subnets R1: router ospf 1 router-id 150.1.100.100
? 【實驗驗證】
? 配置之前--------------------------------------------------------->> R1#show ip route ospf 160.1.0.0/24 is subnetted, 1 subnets O E2 160.1.60.0 [110/20] via 155.1.146.6, 00:00:41, FastEthernet0/0 150.1.0.0/16 is variably subnetted, 4 subnets, 2 masks O 150.1.6.6/32 [110/2] via 155.1.146.6, 00:00:41, FastEthernet0/0 O 150.1.5.5/32 [110/65] via 155.1.0.5, 00:01:24, Serial0/0 O 150.1.4.4/32 [110/2] via 155.1.146.4, 00:00:41, FastEthernet0/0 R4#show ip route ospf 160.1.0.0/24 is subnetted, 1 subnets O N2 160.1.60.0 [110/20] via 155.1.146.6, 00:01:10, Ethernet0/1 150.1.0.0/16 is variably subnetted, 4 subnets, 2 masks O 150.1.6.6/32 [110/11] via 155.1.146.6, 00:01:10, Ethernet0/1 O 150.1.5.5/32 [110/391] via 155.1.0.5, 00:01:25, Serial0/0 O 150.1.1.1/32 [110/11] via 155.1.146.1, 00:01:10, Ethernet0/1 R5#show ip route ospf 155.1.0.0/24 is subnetted, 3 subnets O IA 155.1.146.0 [110/391] via 155.1.0.1, 00:01:28, Serial0/0 160.1.0.0/24 is subnetted, 1 subnets O E2 160.1.60.0 [110/20] via 155.1.0.1, 00:02:06, Serial0/0 150.1.0.0/16 is variably subnetted, 5 subnets, 2 masks O IA 150.1.6.6/32 [110/392] via 155.1.0.1, 00:01:42, Serial0/0 O IA 150.1.4.4/32 [110/391] via 155.1.0.4, 00:04:42, Serial0/0 O IA 150.1.1.1/32 [110/391] via 155.1.0.1, 00:04:36, Serial0/0 R5#show ip ospf database external 160.1.60.0 OSPF Router with ID (150.1.5.5) (Process ID 1) Type-5 AS External Link States Routing Bit Set on this LSA LS age: 226 Options: (No TOS-capability, DC) LS Type: AS External Link Link State ID: 160.1.60.0 (External Network Number ) Advertising Router: 150.1.4.4 LS Seq Number: 80000001 Checksum: 0xBCC2 Length: 36 Network Mask: /24 Metric Type: 2 (Larger than any link state path) TOS: 0 Metric: 20 Forward Address: 150.1.6.6 External Route Tag: 0 R1#show ip ospf database external 160.1.60.0 OSPF Router with ID (150.1.1.1) (Process ID 1) Type-5 AS External Link States Routing Bit Set on this LSA LS age: 321 Options: (No TOS-capability, DC) LS Type: AS External Link Link State ID: 160.1.60.0 (External Network Number ) Advertising Router: 150.1.4.4 LS Seq Number: 80000001 Checksum: 0xBCC2 Length: 36 Network Mask: /24 Metric Type: 2 (Larger than any link state path) TOS: 0 Metric: 20 Forward Address: 150.1.6.6 External Route Tag: 0 R4#show ip ospf database nssa-external 160.1.60.0 OSPF Router with ID (150.1.4.4) (Process ID 1) Type-7 AS External Link States (Area 1) Routing Bit Set on this LSA LS age: 376 Options: (No TOS-capability, Type 7/5 translation, DC) LS Type: AS External Link Link State ID: 160.1.60.0 (External Network Number ) Advertising Router: 150.1.6.6 LS Seq Number: 80000001 Checksum: 0xE63 Length: 36 Network Mask: /24 Metric Type: 2 (Larger than any link state path) TOS: 0 Metric: 20 Forward Address: 150.1.6.6 External Route Tag: 0 配置之后------------------------------------------------>> R1#conf t Enter configuration commands, one per line. End with CNTL/Z. R1(config)#router ospf 1 R1(config-router)#router-id 150.1.100.100 Reload or use "clear ip ospf process" command, for this to take effect R1(config-router)#^Z R1#clear ip ospf process Reset ALL OSPF processes? [no]: yes R1#show ip route ospf 160.1.0.0/24 is subnetted, 1 subnets O N2 160.1.60.0 [110/20] via 155.1.146.6, 00:00:01, FastEthernet0/0 150.1.0.0/16 is variably subnetted, 4 subnets, 2 masks O 150.1.6.6/32 [110/2] via 155.1.146.6, 00:00:30, FastEthernet0/0 O 150.1.5.5/32 [110/65] via 155.1.0.5, 00:00:01, Serial0/0 O 150.1.4.4/32 [110/2] via 155.1.146.4, 00:00:30, FastEthernet0/0 R4#show ip route ospf 160.1.0.0/24 is subnetted, 1 subnets O E2 160.1.60.0 [110/20] via 155.1.146.6, 00:00:08, Ethernet0/1 150.1.0.0/16 is variably subnetted, 4 subnets, 2 masks O 150.1.6.6/32 [110/11] via 155.1.146.6, 00:00:27, Ethernet0/1 O 150.1.5.5/32 [110/391] via 155.1.0.5, 00:00:08, Serial0/0 O 150.1.1.1/32 [110/11] via 155.1.146.1, 00:00:27, Ethernet0/1 R5#show ip route ospf 155.1.0.0/24 is subnetted, 3 subnets O IA 155.1.146.0 [110/391] via 155.1.0.1, 00:00:17, Serial0/0 160.1.0.0/24 is subnetted, 1 subnets O E2 160.1.60.0 [110/20] via 155.1.0.1, 00:00:17, Serial0/0 150.1.0.0/16 is variably subnetted, 5 subnets, 2 masks O IA 150.1.6.6/32 [110/392] via 155.1.0.1, 00:00:17, Serial0/0 O IA 150.1.4.4/32 [110/391] via 155.1.0.4, 00:00:17, Serial0/0 O IA 150.1.1.1/32 [110/391] via 155.1.0.1, 00:00:17, Serial0/0 R5#show ip ospf database external 160.1.60.0 OSPF Router with ID (150.1.5.5) (Process ID 1) Type-5 AS External Link States Routing Bit Set on this LSA LS age: 45 Options: (No TOS-capability, DC) LS Type: AS External Link Link State ID: 160.1.60.0 (External Network Number ) Advertising Router: 150.1.100.100 LS Seq Number: 80000001 Checksum: 0xD7E6 Length: 36 Network Mask: /24 Metric Type: 2 (Larger than any link state path) TOS: 0 Metric: 20 Forward Address: 150.1.6.6 External Route Tag: 0

轉載于:https://blog.51cto.com/haolun/993178

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