HCNA-VRRP（单）

AR1配置：

interface GigabitEthernet0/0/0

ip address 192.168.1.251 255.255.255.0

vrrp vrid 1 virtual-ip 192.168.1.254

vrrp vrid 1 priority 120

#

interface GigabitEthernet0/0/1

ip address 192.168.13.1 255.255.255.0

#

ospf 1

area 0.0.0.0

  network 0.0.0.0 255.255.255.255

---

AR2配置

interface GigabitEthernet0/0/0

ip address 192.168.1.252 255.255.255.0

vrrp vrid 1 virtual-ip 192.168.1.254

#

interface GigabitEthernet0/0/1

ip address 192.168.23.2 255.255.255.0

#

interface NULL0

#

ospf 1

area 0.0.0.0

  network 0.0.0.0 255.255.255.255

---

AR3配置

interface GigabitEthernet0/0/0

ip address 192.168.13.3 255.255.255.0

#

interface GigabitEthernet0/0/1

ip address 192.168.23.3 255.255.255.0

#

interface NULL0

#

interface LoopBack0

ip address 192.168.3.3 255.255.255.255

#

ospf 1

area 0.0.0.0

  network 0.0.0.0 255.255.255.255

---

配置完成，验证：

shutdown AR1的g0/0/0口，会出现两个丢包，然后恢复通信，说明AR2抢占Master，网关通过AR2实现。