拓朴如下：

主要配置如下：

[S1]
vlan batch 10 20
#
interface GigabitEthernet0/0/1
 port link-type access
 port default vlan 10
#
interface GigabitEthernet0/0/2
 port link-type access
 port default vlan 20
#
interface GigabitEthernet0/0/3
 port link-type trunk
 port trunk allow-pass vlan 10 20
#
interface GigabitEthernet0/0/4
 port link-type trunk
 port trunk allow-pass vlan 10 20
#

[R1]
interface GigabitEthernet0/0/0.10
 dot1q termination vid 10
 ip address 192.168.10.251 255.255.255.0 
 vrrp vrid 1 virtual-ip 192.168.10.254
 vrrp vrid 1 priority 200
 vrrp vrid 1 track bfd-session session-name vrrp reduced 101
 arp broadcast enable
#
interface GigabitEthernet0/0/0.20
 dot1q termination vid 20
 ip address 192.168.20.251 255.255.255.0 
 vrrp vrid 2 virtual-ip 192.168.20.254
 arp broadcast enable
#
interface GigabitEthernet0/0/1
 ip address 13.1.1.1 255.255.255.0 
#
bfd vrrp bind peer-ip 13.1.1.3 source-ip 13.1.1.1 auto
 commit
#
ospf 1 
 area 0.0.0.0 
  network 0.0.0.0 255.255.255.255 
#

[R2]
interface GigabitEthernet0/0/0.10
 dot1q termination vid 10
 ip address 192.168.10.252 255.255.255.0 
 vrrp vrid 1 virtual-ip 192.168.10.254
 arp broadcast enable
#
interface GigabitEthernet0/0/0.20
 dot1q termination vid 20
 ip address 192.168.20.252 255.255.255.0 
 vrrp vrid 2 virtual-ip 192.168.20.254
 vrrp vrid 2 priority 200
 arp broadcast enable
#
interface GigabitEthernet0/0/1
 ip address 23.1.1.1 255.255.255.0 
#
ospf 1 
 area 0.0.0.0 
  network 0.0.0.0 255.255.255.255 
#

[R3]
interface GigabitEthernet0/0/0
 ip address 13.1.1.3 255.255.255.0 
#
interface GigabitEthernet0/0/1
 ip address 23.1.1.2 255.255.255.0 
#
interface LoopBack0
 ip address 3.3.3.3 255.255.255.255 
#
bfd vrrp bind peer-ip 13.1.1.1 source-ip 13.1.1.3 auto
 commit
#
ospf 1 
 area 0.0.0.0 
  network 0.0.0.0 255.255.255.255 
#

检测：

关闭S2交换机或者关闭上面的接口，查看R1上面的优先级已经由200降为99，此时，R1的VRRP接口状态均变成Backup，R2成为VRRP两个接口的Master