(2) 配置s9500-b 

# 配置mstp实例
[s9500-b]stp enable
[s9500-b]stp non-flooding
[s9500-b]stp region-configuration
[s9500-b-mst-region]region-name vrrp
[s9500-b-mst-region]instance 2 vlan 2
[s9500-b-mst-region]instance 3 vlan 3
[s9500-b-mst-region]active region-configuration  
[s9500-b-mst-region]quit
[s9500-b]stp instance 3 root primary 
[s9500-b]stp instance 2 root secondary
[s9500-b]interface gigabitethernet 3/1/1
[s9500-b-gigabitethernet3/1/1]stp disable
# 创建vlan 并配置接口地址
 system-view
[s9500-b] vlan 2
[s9500-b-vlan2] interface vlan-interface 2
[s9500-b-vlan-interface2] ip address 2.1.1.2 8
[s9500-b-vlan-interface2] quit
[s9500-b]vlan 3
[s9500-b-vlan3]interface vlan 3
[s9500-b-vlan-interface3]ip address 3.1.1.2 8
[s9500-b-vlan-interface3] quit
[s9500-b]vlan 9
[s9500-b-vlan9]interface vlan 9
[s9500-b-vlan-interface9]ip address 9.1.1.1 8
[s9500-b-vlan-interface9] quit
# 配置端口加入 vlan
[s9500-b]interface gigabitethernet 3/1/1
[s9500-b-gigabitethernet3/1/1]port access vlan 9  
[s9500-b-gigabitethernet3/1/1]quit
[s9500-b]interface gigabitethernet 2/1/1
[s9500-b-gigabitethernet2/1/1]port link-type trunk
[s9500-b-gigabitethernet2/1/1]undo port trunk permit vlan 1
[s9500-b-gigabitethernet2/1/1]port trunk permit vlan 2 to 3
[s9500-b-gigabitethernet2/1/1]quit
[s9500-b]interface gigabitethernet 2/1/2
[s9500-b-gigabitethernet2/1/2]port link-type trunk
[s9500-b-gigabitethernet2/1/2]undo port trunk permit vlan 1
[s9500-b-gigabitethernet2/1/2]port trunk permit vlan 3
[s9500-b-gigabitethernet2/1/2]quit
[s9500-b]interface gigabitethernet 2/1/3
[s9500-b-gigabitethernet2/1/3]port link-type trunk
[s9500-b-gigabitethernet2/1/3]undo port trunk permit vlan 1
[s9500-b-gigabitethernet2/1/3]port trunk permit vlan 2
[s9500-b-gigabitethernet2/1/3]quit
# 配置vrrp备份组
[s9500-b-vlan-interface2] vrrp vrid 1 virtual-ip 2.1.1.3
[s9500-b-vlan-interface2] interface vlan 3
[s9500-b-vlan-interface3] vrrp vrid 1 virtual-ip 2.1.1.3
# 配置vrrp备份组的优先级和握手时间（可选）
[s9500-b-vlan-interface3] vrrp vrid 1 priority 130
[s9500-b-vlan-interface3] interface vlan 2
[s9500-b-vlan-interface2] vrrp vrid 1 timer advertise 2
# 配置监视接口，监视vlan 9的虚接口
[s9500-b-vlan-interface3] vrrp vrid 1 track vlan-interface 9 reduced 40

(3) 配置l2sw-a

[l2sw-a]ivlan 2
[l2sw-a]interface ethernet 0/1
[l2sw-a-ethernet0/1] port link-type trunk
[l2sw-a-ethernet0/1] undo port trunk permit vlan 1 
[l2sw-a-ethernet0/1] port trunk permit vlan 2
[l2sw-a-ethernet0/1]quit
[l2sw-a]interface ethernet0/2
[l2sw-a-ethernet0/2] port link-type trunk
[l2sw-a-ethernet0/2] undo port trunk permit vlan 1  
[l2sw-a-ethernet0/2] port trunk permit vlan 2
[l2sw-a-ethernet0/2]quit
[l2sw-a]interface ethernet0/3
[l2sw-a-ethernet0/3]port access vlan 2
(4) 配置l2sw-b
[l2sw-b]ivlan 3
[l2sw-b]interface ethernet 0/1
[l2sw-b-ethernet0/1] port link-type trunk 
[l2sw-b-ethernet0/1] undo port trunk permit vlan 1
[l2sw-b-ethernet0/1] port trunk permit vlan 3
[l2sw-b-ethernet0/1]quit
[l2sw-b]interface ethernet0/2
[l2sw-b-ethernet0/2] port link-type trunk 
[l2sw-b-ethernet0/2] undo port trunk permit vlan 1
[l2sw-b-ethernet0/2] port trunk permit vlan 3
[l2sw-b-ethernet0/2]quit
[l2sw-b]interface ethernet0/3
[l2sw-b-ethernet0/3]port access vlan 3