拓扑图

PC2的网关为40.1.1.2或者40.1.1.1

步骤一：

r1配置

[Huawei]interface GigabitEthernet 0/0/1
[Huawei-GigabitEthernet0/0/1]ip address 10.1.2.1 255.255.255.0
[Huawei-GigabitEthernet0/0/1]interface GigabitEthernet 0/0/2
[Huawei-GigabitEthernet0/0/2]ip address 40.1.1.1 255.255.255.0
[Huawei-GigabitEthernet0/0/2]q

//配置端口IP
[Huawei]sysname r1
[r1]interface GigabitEthernet 0/0/1
[r1-GigabitEthernet0/0/1]vrrp vrid 1 virt    
[r1-GigabitEthernet0/0/1]vrrp vrid 1 virtual-ip 10.1.2.3
[r1-GigabitEthernet0/0/1]q 

//设置备份组1

r2配置

 [Huawei]interface GigabitEthernet 0/0/1
[Huawei-GigabitEthernet0/0/1]ip address 10.1.2.2 255.255.255.0
[Huawei-GigabitEthernet0/0/1]interface GigabitEthernet 0/0/2
[Huawei-GigabitEthernet0/0/2]ip address 40.1.1.2 255.255.255.0
[Huawei-GigabitEthernet0/0/2]q

//配置端口IP
[Huawei]sysname r2
[r2]interface GigabitEthernet 0/0/1
[r2-GigabitEthernet0/0/1]vrrp vrid 1 virtual-ip 10.1.2.3
[r2-GigabitEthernet0/0/1]q

//设置备份组1

步骤二：查看信息

 [r1]dis vrrp brief

  [r2]dis vrrp brief

步骤四：验证

 PC>ping 40.1.1.100

PC>tracert 40.1.1.100       //查看到40.1.1.100路过的端口IP

 [r1]interface GigabitEthernet 0/0/1
[r1-GigabitEthernet0/0/1]shutdown           //关闭GigabitEthernet 0/0/1端口

步骤五：加强联系，实现双路线备份

先配置r2（因为r1和r2的优先级相同，默认100，所以先配置的为主路由器，后配置的为备份路由）

 [Huawei]interface GigabitEthernet 0/0/1
[Huawei-GigabitEthernet0/0/1]vrrp vrid 2 virtual-ip 10.1.2.4
[Huawei-GigabitEthernet0/0/1]q
[Huawei]dis vrrp brief               

//将GigabitEthernet 0/0/1加入备份组2

后r1配置

 [r1]interface GigabitEthernet 0/0/1
[r1-GigabitEthernet0/0/1]vrrp vrid 2 virtual-ip 10.1.2.4
[r1-GigabitEthernet0/0/1]q
[r1]dis vrrp brief

//将GigabitEthernet 0/0/1加入备份组2

解析(个人理解）：

通俗来讲，也就是说正常情况下pc1过r1这条路径到达pc2，r2是r1的备份

pc3过r2这条路径到达pc2，r1是r2的备份

两者都可以过数据，也就是说不会浪费资源，同时两者有互为备份，提高了传输的可靠性。