实验二十六、OSPF 虚连接的配置
一、 实验目的
1. 掌握多区域OSPF 虚连接的配置
2. 理解OSPF 虚连接的意义
二、 应用环境
在大规模网络中，我们通常划分区域减少资源消耗，并将拓扑的变化本地化。由于实际环境
的限制，不能物理的将其他区域环绕骨干区域，可以采用虚连接的方式逻辑的连接到骨干区
域。
三、 实验设备
1. DCR-1751 三台
2. CR-V35MT 一条
3. CR-V35FC 一条
四、 实验拓扑
五、 实验要求
配置表
Router-A Router-B Router-C
S1/1(DCE) 192.168.1.1 S/1/0(DTE) 192.168.1.2 F0/0 192.168.2.2
F0/0 192.168.0.1 F0/0 192.168.2.1 E1/0 192.168.3.1
路由器A、B 为ABR
六、 实验步骤
第一步：参照实验三和上表配置各接口地址，并测试连通性
第二步：路由器A 的配置Router-A#conf
Router-A_config#router ospf 100
Router-A_config_ospf_100#network 192.168.0.0 255.255.255.0 area 3
Router-A_config_ospf_100#network 192.168.1.0 255.255.255.0 area 1
Router-A_config_ospf_100#^Z
第三步：路由器B 的配置
Router-B#conf
Router-B_config#router ospf 100
Router-B_config_ospf_100#network 192.168.1.0 255.255.255.0 area 1
Router-B_config_ospf_100#network 192.168.2.0 255.255.255.0 area 0
Router-B_config_ospf_100#^Z
第四步：路由器C 的配置
Router-C#conf
Router-C_config#router ospf 100
Router-C_config_ospf_100#network 192.168.2.0 255.255.255.0 area 0
Router-C_config_ospf_100#network 192.168.3.0 255.255.255.0 area 0
Router-C_config_ospf_100#^Z
第五步：查看路由器A 的邻居表
Router-A#sh ip ospf neighbor
----------------------------------------------------------------------------
OSPF process: 100
Virtual Link Neighbor
Neighbor ID Pri State DeadTime
AREA: 0
Neighbor ID Pri State DeadTime Neighbor Addr Interface
AREA: 1
Neighbor ID Pri State DeadTime Neighbor Addr Interface
192.168.2.1 1 FULL/- 38 192.168.1.2 Serial1/1
AREA: 3
Neighbor ID Pri State DeadTime Neighbor Addr Interface
我们看到路由器B 的ROUTER-ID 是 192.168.2.1
第六步：查看路由器B 的邻居表
Router-B#sh ip ospf neighbor
----------------------------------------------------------------------------
OSPF process: 100 Virtual Link Neighbor
Neighbor ID Pri State DeadTime
AREA: 0
Neighbor ID Pri State DeadTime Neighbor Addr Interface
192.168.3.1 1 FULL/BDR 36 192.168.2.2 FastEthernet0/
0
AREA: 1
Neighbor ID Pri State DeadTime Neighbor Addr Interface
192.168.1.1 1 FULL/- 32 192.168.1.1 Serial1/0
我们看到A 的ROUTER-ID 是 192.168.1.1
第七步：配置虚连接
Router-A#conf
Router-A_config#router ospf 100
Router-A_config_ospf_100#area 1 virtual-link 192.168.2.1 ！注意是ROUTER-ID
Router-B_config#router ospf 100
Router-B_config_ospf_100#area 1 virtual-link 192.168.1.1 ！注意是ROUTER-ID
第八步：查看虚连接
Router-A#sh ip ospf virtual-link
Virtual Link Neighbor ID 192.168.2.1 (UP)
TransArea: 1, Cost is 1600
Hello interval is 10, Dead timer is 40 Retransmit is 5
INTF Adjacency state is IPOINT_TO_POINT
Router-B#sh ip ospf virtual-link
Virtual Link Neighbor ID 192.168.1.1 (UP)
TransArea: 1, Cost is 1600
Hello interval is 10, Dead timer is 40 Retransmit is 5
INTF Adjacency state is IPOINT_TO_POINT
