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Cisco OSPF虚链路验证过程配置实例

时间:2010-4-14来源:互联网 点击:

      r3#sh ip ro

  3.0.0.0/24 is subnetted, 1 subnets

  C 3.3.3.0 is directly connected, Loopback0

  C 193.1.1.0/24 is directly connected, Ethernet1/0

  O 192.1.1.0/24 [110/20] via 193.1.1.2, 00:02:56, Ethernet1/0

  C 194.1.1.0/24 is directly connected, Ethernet0/0

  //R3的192路由原本为IA类型(区域间),现在转为O类型(区域内),说明R3认为自已与192网段是直连的。虚链路相当于将R3直接连接了AREA 0 与 AREA 4区域

  r4#sh ip ro

  4.0.0.0/24 is subnetted, 1 subnets

  C 4.4.4.0 is directly connected, Loopback0

  O IA 193.1.1.0/24 [110/20] via 194.1.1.3, 00:03:40, Ethernet0/0

  O IA 192.1.1.0/24 [110/30] via 194.1.1.3, 00:03:25, Ethernet0/0

  C 194.1.1.0/24 is directly connected, Ethernet0/0

  //R4上192路由类型IA(区域间)

  最后我们将虚链路效果再与正常连接方式进行一下比对,如下图:

 

  验证如下:

  r1#sh ip ro

  1.0.0.0/24 is subnetted, 1 subnets

  C 1.1.1.0 is directly connected, Loopback0

  O IA 193.1.1.0/24 [110/20] via 192.1.1.2, 00:00:41, Ethernet0/0

  C 192.1.1.0/24 is directly connected, Ethernet0/0

  C 192.2.2.0/24 is directly connected, Ethernet1/0

  O IA 194.1.1.0/24 [110/20] via 192.2.2.4, 00:00:39, Ethernet1/0

  r2#sh ip ro

  2.0.0.0/24 is subnetted, 1 subnets

  C 2.2.2.0 is directly connected, Loopback0

  C 193.1.1.0/24 is directly connected, Ethernet1/0

  C 192.1.1.0/24 is directly connected, Ethernet0/0

  O 192.2.2.0/24 [110/20] via 192.1.1.1, 00:01:04, Ethernet0/0

  O IA 194.1.1.0/24 [110/30] via 192.1.1.1, 00:00:03, Ethernet0/0

  r2#

  r3#sh ip ro

  3.0.0.0/24 is subnetted, 1 subnets

  C 3.3.3.0 is directly connected, Loopback0

  C 193.1.1.0/24 is directly connected, Ethernet1/0

  O IA 192.1.1.0/24 [110/20] via 193.1.1.2, 00:01:31, Ethernet1/0

  O IA 192.2.2.0/24 [110/30] via 193.1.1.2, 00:01:15, Ethernet1/0

  O IA 194.1.1.0/24 [110/40] via 193.1.1.2, 00:00:15, Ethernet1/0

  r4#sh ip ro

  4.0.0.0/24 is subnetted, 1 subnets

  C 4.4.4.0 is directly connected, Loopback0

  O IA 193.1.1.0/24 [110/30] via 192.2.2.1, 00:00:39, Ethernet1/0

  O 192.1.1.0/24 [110/20] via 192.2.2.1, 00:01:37, Ethernet1/0

  C 192.2.2.0/24 is directly connected, Ethernet1/0

  C 194.1.1.0/24 is directly connected, Ethernet0/0

  r5#sh ip ro

  5.0.0.0/24 is subnetted, 1 subnets

  C 5.5.5.0 is directly connected, Loopback0

  O IA 193.1.1.0/24 [110/40] via 194.1.1.4, 00:00:52, Ethernet0/0

  O IA 192.1.1.0/24 [110/30] via 194.1.1.4, 00:00:52, Ethernet0/0

  O IA 192.2.2.0/24 [110/20] via 194.1.1.4, 00:00:52, Ethernet0/0

  C 194.1.1.0/24 is directly connected, Ethernet0/0

  如果上述方式还不容易理解,你也可以将virtual-link可以想象成:将R2与R3合并成一台路由器,如下图:

 

  r1#sh ip ro

  1.0.0.0/24 is subnetted, 1 subnets

  C 1.1.1.0 is directly connected, Loopback0

  O IA 193.1.1.0/24 [110/20] via 192.1.1.2, 00:00:57, Ethernet0/0

  C 192.1.1.0/24 is directly connected, Ethernet0/0

  O IA 194.1.1.0/24 [110/74] via 192.1.1.2, 00:00:24, Ethernet0/0

  r2#sh ip ro

  2.0.0.0/24 is subnetted, 1 subnets

  C 2.2.2.0 is directly connected, Loopback0

  C 193.1.1.0/24 is directly connected, Ethernet1/0

  C 192.1.1.0/24 is directly connected, Ethernet0/0

  C 194.1.1.0/24 is directly connected, Serial2/0

  r3#sh ip ro

  3.0.0.0/24 is subnetted, 1 subnets

  C 3.3.3.0 is directly connected, Loopback0

  C 193.1.1.0/24 is directly connected, Ethernet1/0

  O IA 192.1.1.0/24 [110/20] via 193.1.1.2, 00:01:06, Ethernet1/0

  O IA 194.1.1.0/24 [110/74] via 193.1.1.2, 00:00:37, Ethernet1/0

  r4#sh ip ro

  4.0.0.0/24 is subnetted, 1 subnets

  C 4.4.4.0 is directly connected, Loopback0

  O IA 193.1.1.0/24 [110/74] via 194.1.1.2, 00:00:17, Serial2/0

  O IA 192.1.1.0/24 [110/74] via 194.1.1.2, 00:00:17, Serial2/0

  C 194.1.1.0/24 is directly connected, Serial2/0

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TAG: Cisco OSPF验证 虚链路 配置
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