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ospf 区域类型详细

  我们知道ospf中有几种区域类型:stub ,totally stub ,nssa ,totally nssa.

  下面分别讲一下各种区域类型对路由的改变,实验图如下:

ospf 区域类型详细

  按如图配置好相关接口和参数,配置好后,查看R6路由如下:

  O IA 192.168.123.0/24 [110/20] via 192.168.36.3, 00:00:04, FastEthernet0/0

  1.0.0.0/32 is subnetted, 1 subnets

  O IA 1.1.1.1 [110/21] via 192.168.36.3, 00:00:04, FastEthernet0/0

  2.0.0.0/32 is subnetted, 1 subnets

  O IA 2.2.2.2 [110/21] via 192.168.36.3, 00:00:04, FastEthernet0/0

  O IA 192.168.14.0/24 [110/30] via 192.168.36.3, 00:00:04, FastEthernet0/0

  3.0.0.0/32 is subnetted, 1 subnets

  O 3.3.3.3 [110/11] via 192.168.36.3, 00:00:04, FastEthernet0/0

  O IA 192.168.25.0/24 [110/30] via 192.168.36.3, 00:00:05, FastEthernet0/0

  4.0.0.0/32 is subnetted, 1 subnets

  O IA 4.4.4.4 [110/31] via 192.168.36.3, 00:00:05, FastEthernet0/0

  5.0.0.0/32 is subnetted, 1 subnets

  O IA 5.5.5.5 [110/31] via 192.168.36.3, 00:00:05, FastEthernet0/0

  6.0.0.0/32 is subnetted, 1 subnets

  C 6.6.6.6 is directly connected, Loopback0

  172.16.0.0/24 is subnetted, 4 subnets

  O E2 172.16.0.0 [110/20] via 192.168.36.3, 00:00:05, FastEthernet0/0

  O E2 172.16.1.0 [110/20] via 192.168.36.3, 00:00:05, FastEthernet0/0

  O E2 172.16.2.0 [110/20] via 192.168.36.3, 00:00:05, FastEthernet0/0

  O E2 172.16.3.0 [110/20] via 192.168.36.3, 00:00:05, FastEthernet0/0

  C 192.168.36.0/24 is directly connected, FastEthernet0/0

  O E2 192.168.0.0/24 [110/20] via 192.168.36.3, 00:00:05, FastEthernet0/0

  O E2 192.168.1.0/24 [110/20] via 192.168.36.3, 00:00:05, FastEthernet0/0

  O E2 192.168.2.0/24 [110/20] via 192.168.36.3, 00:00:05, FastEthernet0/0

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  O E2 192.168.3.0/24 [110/20] via 192.168.36.3, 00:00:06, FastEthernet0/0

  配置R3及R6 area 3 为stub区域:

  配置命令为:

  R3(config-router)#area 3 stub

  R6(config-router)#area 3 stub

  修改完成后,R6路由如下:

  O IA 192.168.123.0/24 [110/20] via 192.168.36.3, 00:00:04, FastEthernet0/0

  1.0.0.0/32 is subnetted, 1 subnets

  O IA 1.1.1.1 [110/21] via 192.168.36.3, 00:00:04, FastEthernet0/0

  2.0.0.0/32 is subnetted, 1 subnets

  O IA 2.2.2.2 [110/21] via 192.168.36.3, 00:00:04, FastEthernet0/0

  O IA 192.168.14.0/24 [110/30] via 192.168.36.3, 00:00:04, FastEthernet0/0

  3.0.0.0/32 is subnetted, 1 subnets

  O 3.3.3.3 [110/11] via 192.168.36.3, 00:00:04, FastEthernet0/0

  O IA 192.168.25.0/24 [110/30] via 192.168.36.3, 00:00:05, FastEthernet0/0

  4.0.0.0/32 is subnetted, 1 subnets

  O IA 4.4.4.4 [110/31] via 192.168.36.3, 00:00:05, FastEthernet0/0

  5.0.0.0/32 is subnetted, 1 subnets

  O IA 5.5.5.5 [110/31] via 192.168.36.3, 00:00:05, FastEthernet0/0

  6.0.0.0/32 is subnetted, 1 subnets

  C 6.6.6.6 is directly connected, Loopback0

  C 192.168.36.0/24 is directly connected, FastEthernet0/0

  O*IA 0.0.0.0/0 [110/11] via 192.168.36.3, 00:00:07, FastEthernet0/0

  由此可知stub区域不接收任何外部路由,用一条默认路由替代所有外部路由。

  先在R4上查看路由表:

  O IA 192.168.123.0/24 [110/20] via 192.168.14.1, 00:00:51, FastEthernet0/0

  1.0.0.0/32 is subnetted, 1 subnets

  O IA 1.1.1.1 [110/11] via 192.168.14.1, 00:00:51, FastEthernet0/0

  2.0.0.0/32 is subnetted, 1 subnets

  O IA 2.2.2.2 [110/21] via 192.168.14.1, 00:00:51, FastEthernet0/0

  C 192.168.14.0/24 is directly connected, FastEthernet0/0

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  3.0.0.0/32 is subnetted, 1 subnets

  O IA 3.3.3.3 [110/21] via 192.168.14.1, 00:00:51, FastEthernet0/0

  O IA 192.168.25.0/24 [110/30] via 192.168.14.1, 00:00:52, FastEthernet0/0

  4.0.0.0/32 is subnetted, 1 subnets

  C 4.4.4.4 is directly connected, Loopback0

  5.0.0.0/32 is subnetted, 1 subnets

  O IA 5.5.5.5 [110/31] via 192.168.14.1, 00:00:52, FastEthernet0/0

  6.0.0.0/32 is subnetted, 1 subnets

  O IA 6.6.6.6 [110/31] via 192.168.14.1, 00:00:52, FastEthernet0/0

  172.16.0.0/24 is subnetted, 4 subnets

  O E2 172.16.0.0 [110/20] via 192.168.14.1, 00:00:52, FastEthernet0/0

  O E2 172.16.1.0 [110/20] via 192.168.14.1, 00:00:52, FastEthernet0/0

  O E2 172.16.2.0 [110/20] via 192.168.14.1, 00:00:52, FastEthernet0/0

  O E2 172.16.3.0 [110/20] via 192.168.14.1, 00:00:52, FastEthernet0/0

  O IA 192.168.36.0/24 [110/30] via 192.168.14.1, 00:00:52, FastEthernet0/0

  C 192.168.0.0/24 is directly connected, Loopback1

  C 192.168.1.0/24 is directly connected, Loopback1

  C 192.168.2.0/24 is directly connected, Loopback1

  C 192.168.3.0/24 is directly connected, Loopback1

  在R4和R1上运行以下命令:

  R2(config-router)#area 2 nssa no-summary

  R4(config-router)#area 2 nssa no-summary

  再次查看路由表:

  C 192.168.14.0/24 is directly connected, FastEthernet0/0

  4.0.0.0/32 is subnetted, 1 subnets

  C 4.4.4.4 is directly connected, Loopback0

  C 192.168.0.0/24 is directly connected, Loopback1

  C 192.168.1.0/24 is directly connected, Loopback1

  C 192.168.2.0/24 is directly connected, Loopback1

  C 192.168.3.0/24 is directly connected, Loopback1

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  O*IA 0.0.0.0/0 [110/11] via 192.168.14.1, 00:00:19, FastEthernet0/0

  由此可知nssa totally 区域去掉所区域间和外部路由

  先来查看一下R5路由表:

  O IA 192.168.123.0/24 [110/20] via 192.168.25.2, 00:35:59, FastEthernet0/0

  1.0.0.0/32 is subnetted, 1 subnets

  O IA 1.1.1.1 [110/21] via 192.168.25.2, 00:35:59, FastEthernet0/0

  2.0.0.0/32 is subnetted, 1 subnets

  O IA 2.2.2.2 [110/11] via 192.168.25.2, 00:35:59, FastEthernet0/0

  O IA 192.168.14.0/24 [110/30] via 192.168.25.2, 00:35:59, FastEthernet0/0

  3.0.0.0/32 is subnetted, 1 subnets

  O IA 3.3.3.3 [110/21] via 192.168.25.2, 00:35:59, FastEthernet0/0

  C 192.168.25.0/24 is directly connected, FastEthernet0/0

  4.0.0.0/32 is subnetted, 1 subnets

  O IA 4.4.4.4 [110/31] via 192.168.25.2, 00:02:07, FastEthernet0/0

  5.0.0.0/32 is subnetted, 1 subnets

  C 5.5.5.5 is directly connected, Loopback0

  6.0.0.0/32 is subnetted, 1 subnets

  O IA 6.6.6.6 [110/31] via 192.168.25.2, 00:12:47, FastEthernet0/0

  172.16.0.0/24 is subnetted, 4 subnets

  C 172.16.0.0 is directly connected, Loopback1

  C 172.16.1.0 is directly connected, Loopback1

  C 172.16.2.0 is directly connected, Loopback1

  C 172.16.3.0 is directly connected, Loopback1

  O IA 192.168.36.0/24 [110/30] via 192.168.25.2, 00:12:47, FastEthernet0/0

  O E2 192.168.0.0/24 [110/20] via 192.168.25.2, 00:02:02, FastEthernet0/0

  O E2 192.168.1.0/24 [110/20] via 192.168.25.2, 00:02:02, FastEthernet0/0

  O E2 192.168.2.0/24 [110/20] via 192.168.25.2, 00:02:02, FastEthernet0/0

  O E2 192.168.3.0/24 [110/20] via 192.168.25.2, 00:02:02, FastEthernet0/0

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  在R2和R5上运行如下命令:

  R2(config-router)#area 1 nssa

  R5(config-router)#area 1 nssa

  O IA 192.168.123.0/24 [110/20] via 192.168.25.2, 00:00:02, FastEthernet0/0

  1.0.0.0/32 is subnetted, 1 subnets

  O IA 1.1.1.1 [110/21] via 192.168.25.2, 00:00:02, FastEthernet0/0

  2.0.0.0/32 is subnetted, 1 subnets

  O IA 2.2.2.2 [110/11] via 192.168.25.2, 00:00:02, FastEthernet0/0

  O IA 192.168.14.0/24 [110/30] via 192.168.25.2, 00:00:02, FastEthernet0/0

  3.0.0.0/32 is subnetted, 1 subnets

  O IA 3.3.3.3 [110/21] via 192.168.25.2, 00:00:02, FastEthernet0/0

  C 192.168.25.0/24 is directly connected, FastEthernet0/0

  4.0.0.0/32 is subnetted, 1 subnets

  O IA 4.4.4.4 [110/31] via 192.168.25.2, 00:00:03, FastEthernet0/0

  5.0.0.0/32 is subnetted, 1 subnets

  C 5.5.5.5 is directly connected, Loopback0

  6.0.0.0/32 is subnetted, 1 subnets

  O IA 6.6.6.6 [110/31] via 192.168.25.2, 00:00:03, FastEthernet0/0

  172.16.0.0/24 is subnetted, 4 subnets

  C 172.16.0.0 is directly connected, Loopback1

  C 172.16.1.0 is directly connected, Loopback1

  C 172.16.2.0 is directly connected, Loopback1

  C 172.16.3.0 is directly connected, Loopback1

  O IA 192.168.36.0/24 [110/30] via 192.168.25.2, 00:00:03, FastEthernet0/0

  这时发现没有默认路由,需运行以下命令:

  R2(config-router)#area 1 nssa default-information-originate

  这时R5路由如下:

  O IA 192.168.123.0/24 [110/20] via 192.168.25.2, 00:01:57, FastEthernet0/0

  1.0.0.0/32 is subnetted, 1 subnets

  O IA 1.1.1.1 [110/21] via 192.168.25.2, 00:01:57, FastEthernet0/0

  2.0.0.0/32 is subnetted, 1 subnets

  O IA 2.2.2.2 [110/11] via 192.168.25.2, 00:01:57, FastEthernet0/0

[Ok3w_NextPage]

  O IA 192.168.14.0/24 [110/30] via 192.168.25.2, 00:01:57, FastEthernet0/0

  3.0.0.0/32 is subnetted, 1 subnets

  O IA 3.3.3.3 [110/21] via 192.168.25.2, 00:01:57, FastEthernet0/0

  C 192.168.25.0/24 is directly connected, FastEthernet0/0

  4.0.0.0/32 is subnetted, 1 subnets

  O IA 4.4.4.4 [110/31] via 192.168.25.2, 00:01:59, FastEthernet0/0

  5.0.0.0/32 is subnetted, 1 subnets

  C 5.5.5.5 is directly connected, Loopback0

  6.0.0.0/32 is subnetted, 1 subnets

  O IA 6.6.6.6 [110/31] via 192.168.25.2, 00:01:59, FastEthernet0/0

  172.16.0.0/24 is subnetted, 4 subnets

  C 172.16.0.0 is directly connected, Loopback1

  C 172.16.1.0 is directly connected, Loopback1

  C 172.16.2.0 is directly connected, Loopback1

  C 172.16.3.0 is directly connected, Loopback1

  O IA 192.168.36.0/24 [110/30] via 192.168.25.2, 00:01:59, FastEthernet0/0

  O*N2 0.0.0.0/0 [110/1] via 192.168.25.2, 00:00:06, FastEthernet0/0

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