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cisco怎么配置OSPF虚链路 cisco配置OSPF虚链路的方法

cisco怎么配置OSPF虚链路 cisco配置OSPF虚链路的方法  这个配置将验证一个OSPF虚电路(Virtual-Link)的过程,重点在观察虚链路连接的临时网络与正常区域间路由有何区别。上图中区域4(area 4)没有和area 0直接相连。在R2与R3之间配置了一条虚链路。


  // R1 //


  int lo0


  ip ad 1.1.1.1 255.255.255.0


  int e0


  ip ad 192.1.1.1 255.255.255.0


  router os 1


  network 192.1.1.0 0.0.0.255 area 0


  // R2 //


  int lo0


  ip ad 2.2.2.2 255.255.255.0


  int e0


  ip ad 192.1.1.2 255.255.255.0


  int e1


  ip ad 193.1.1.2 255.255.255.0


  router os 1


  network 192.1.1.0 0.0.0.255 area 0


  network 193.1.1.0 0.0.0.255 area 1


  // R3 //


  int lo0


  ip ad 3.3.3.3 255.255.255.0


  int e1


  ip ad 193.1.1.3 255.255.255.0


  int e0


  ip ad 194.1.1.3 255.255.255.0


  router os 1


  network 193.1.1.0 0.0.0.255 area 1


  network 194.1.1.0 0.0.0.255 area 4


  // R4 //


  int lo0


  ip ad 4.4.4.4 255.255.255.0


  int e0


  ip ad 194.1.1.4 255.255.255.0


  router os 1


  network 194.1.1.0 0.0.0.255 area 4


  基本配置完成后,我们在每台路由器上分别来验证一下:


  r1#sh ip os nei


  Neighbor ID Pri State Dead Time Address Interface


  2.2.2.2 1 FULL/BDR 00:00:33 192.1.1.2 Ethernet0/0


  r1#


  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, 00:00:19, Ethernet0/0


  C 192.1.1.0/24 is directly connected, Ethernet0/0


  //注意R1上有关于193.1.1.0的路由条目,是属于IA类型(域间路由)


  r2#sh ip os nei


  Neighbor ID Pri State Dead Time Address Interface


  1.1.1.1 1 FULL/DR 00:00:35 192.1.1.1 Ethernet0/0


  3.3.3.3 1 FULL/BDR 00:00:35 193.1.1.3 Ethernet1/0


  r2#


  r2#


  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


  r3#sh ip os nei


  Neighbor ID Pri State Dead Time Address Interface


  2.2.2.2 1 FULL/DR 00:00:32 193.1.1.2 Ethernet1/0


  4.4.4.4 1 FULL/DR 00:00:34 194.1.1.4 Ethernet0/0


  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, 00:02:49, Ethernet1/0


  C 194.1.1.0/24 is directly connected, Ethernet0/0


  //注意R3中有关于192.1.1.0的路由是属于IA类型(域间路由)


  r4#sh ip os nei


  Neighbor ID Pri State Dead Time Address Interface


  3.3.3.3 1 FULL/BDR 00:00:33 194.1.1.3 Ethernet0/0


  r4#sh ip ro


  4.0.0.0/24 is subnetted, 1 subnets


  C 4.4.4.0 is directly connected, Loopback0


  C 194.1.1.0/24 is directly connected, Ethernet0/0


  //R4上没有关于AREA 0内的任何路由信息


  我们下面在R2、R3上添加Virtual-link的配置:


  R2:


  router os 1


  area 1 virtual-link 3.3.3.3


  R3:


  router os 1


  area 1 virtual-link 2.2.2.2


  对比之前的路由信息,看有何区别:


  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, 00:00:01, Ethernet0/0


  C 192.1.1.0/24 is directly connected, Ethernet0/0


  O IA 194.1.1.0/24 [110/30] via 192.1.1.2, 00:00:01, Ethernet0/0


  //多了一条194网段的路由,类型IA(区域间)


  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 IA 194.1.1.0/24 [110/20] via 193.1.1.3, 00:00:06, Ethernet1/0


  //多了一条194网段路由,类型为IA(区域间)


  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
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