HSRP 
划分 vlan
R6(config-if)#switchport access vlan 10
R6(config-if)#inter f1/2
R6(config-if)#switchport access vlan 20
R6(config)#interface range f1/3 -4 配置
R5>en
R5#conf t
R5(config)#vlan 10 配置地址
R5(config-if)#no shut
R5(config)#inter vlan 10
R5(config-if)#standby 2 ip 192.168.10.1 配置占先权
R5(config-if)#standby 2 priority 150 配置 vlan20 配置占先权
R5(config-if)#standby 3 priority 145 负载均衡
% This switch is already the root of VLAN10 spanning tree
VLAN 10 bridge priority set to 8192
VLAN 10 bridge max aging time unchanged at 20
VLAN 10 bridge hello time unchanged at 2
VLAN 10 bridge forward delay unchanged at 15
R5(config)#spanning-tree vlan 20 root secondary
VLAN 20 bridge priority set to 16384
VLAN 20 bridge max aging time unchanged at 20
VLAN 20 bridge hello time unchanged at 2
VLAN 20 bridge forward delay unchanged at 15
R5(config)#inter f1/0
R5(config-if)#no switchport
R5(config-if)#ip address 202.106.1.10
R5(config-if)#ip address 202.106.1.10 255.255.255.0
R5(config-if)#no shut
R5(config)#ip route 0.0.0.0 0.0.0.0 202.106.1.1 上配置
R3>en
R3#conf t
R3(config)#inte f1/1 给 vlan 抢占
R3(config-if)#inter vlan 20
R3(config-if)#ip address 192.168.20.11 255.255.255.0
R3(config-if)#no shut
R3(config-if)#standby 3 ip 192.168.20.1
R3(config-if)#standby 3 preempt
R3(config-if)#standby 3 priority 150 负载均衡
VLAN 10 bridge priority set to 16384
VLAN 10 bridge max aging time unchanged at 20
VLAN 10 bridge hello time unchanged at 2
VLAN 10 bridge forward delay unchanged at 15
R3(config)#spanning-tree vlan 20 root primary
VLAN 20 bridge priority set to 8192
VLAN 20 bridge max aging time unchanged at 20
VLAN 20 bridge hello time unchanged at 2
VLAN 20 bridge forward delay unchanged at 15
R3(config)#ip route 0.0.0.0 0.0.0.0 202.106.10.1 上配置：
R4>en
R4#conf t
R4(config)#inter f0/0
R4(config-if)#ip address 202.106.10.1 255.255.255.0 测试结果
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