虚链路配置实验

实验要求：

配置虚链路使OSPF Area 2能够正常工作，实现全网互通。

实验规划：

网络拓扑图：

网络规划：

R1和R4的互联地址为10.0.0.0/30，R1和R2的互联地址为10.0.0.4/30，R2和R3的互联地址为10.0.0.8/30.

用各路由器的Loopback0地址作为Router ID，并且配置Loopback1接口地址来模拟网络环境，地址如下：

1. R1：Loopback0地址为1.1.1.1/32,Loopback1地址为192.168.0.1/24。
2. R2：Loopback0地址为2.2.2.2/32,Loopback1地址为192.168.1.1/24。
3. R3：Loopback0地址为3.3.3.3/32,Loopback1地址为192.168.2.1/24。
4. R4：Loopback0地址为4.4.4.4/32,Loopback1地址为192.168.3.1/24。

实验配置:

配置全网互通并启用OSPF协议：

IOU1:

config terminal
interface e0/0
ip address 10.0.0.1 255.255.255.252
no shutdown
interface e0/1
ip address 10.0.0.5 255.255.255.252
no shutdown
interface loopback 0
ip address 1.1.1.1 255.255.255.255
no shutdown
interface loopback 1
ip address 192.168.0.1 255.255.255.0
no shutdown
exit
router ospf 1
router-id 1.1.1.1
network 10.0.0.4 0.0.0.3 area 1
network 1.1.1.1 0.0.0.0 area 0
network 10.0.0.0 0.0.0.3 area 0
network 192.168.0.0 0.0.0.255 area 0
exit

IOU2:

config terminal
interface e0/0
ip address 10.0.0.9 255.255.255.252
no shutdown
interface e0/1
ip address 10.0.0.6 255.255.255.252
no shutdown
interface loopback 0
ip address 2.2.2.2 255.255.255.255
no shutdown
interface loopback 1
ip address 192.168.1.1 255.255.255.0
no shutdown
exit
router ospf 1
router-id 2.2.2.2
network 2.2.2.2 0.0.0.0 area 1
network 10.0.0.4 0.0.0.3 area 1
network 10.0.0.8 0.0.0.3 area 2
network 192.168.1.0 0.0.0.255 area 1
exit

IOU3:

config terminal
interface e0/0
ip address 10.0.0.10 255.255.255.252
no shutdown
interface loopback 0
ip address 3.3.3.3 255.255.255.255
no shutdown
interface loopback 1
ip address 192.168.2.1 255.255.255.0
no shutdown
exit
router ospf 1
router-id 3.3.3.3
network 3.3.3.3 0.0.0.0 area 2
network 192.168.2.0 0.0.0.255 area 2
network 10.0.0.8 0.0.0.3 area 2
exit

IOU4:

config terminal
interface e0/0
ip address 10.0.0.2 255.255.255.252
no shutdown
interface loopback 0
ip address 4.4.4.4 255.255.255.255
no shutdown
interface loopback 1
ip address 192.168.3.1 255.255.255.0
no shutdown
exit
router ospf 1 
router-id 4.4.4.4
network 4.4.4.4 0.0.0.0 area 0
network 192.168.3.0 0.0.0.255 area 0
network 10.0.0.0 0.0.0.3 area 0
exit

查看IOU1的路由表，发现不能学到Area 2区域的路由。

配置虚链路：

IOU1:

router ospf 1
area 1 virtual-link 2.2.2.2
exit

IOU2:

router ospf 1
area 1 virtual-link 1.1.1.1
exit

查看IOU1路由表：

show ip route

查看虚链路状态：

show ip ospf virtual-links

测试连通性：

结果符合预期，实验结束。

（如有疏漏，还请读者指出）