SW4的配置顺序：
1）配置trunk口，允许所有vlan通过
2）进入stp区域配置，将vlan10，vlan20映射到实例1，将vlan30，vlan40映射到实例2，
3）进入g1/0/1和g1/0/2端口视图，关闭stp
3）进入smart-link组，将g1/0/1和g1/0/2加入该smart-link组，记得把instance 0设置为某个smart-link组的保护vlan
a）设置保护vlan
b）设置控制vlan
c）设置master端口抢占角色

SW2和SW3的配置顺序：
1）配置trunk口，允许所有vlan通过
2）进行g1/0/1和g1/0/2端口，关闭stp，开启接送flush报文发送和接受功能
3）进入monitor-link组，配置上行端口和下行端口

SW1的配置顺序:
1）配置trunk口，允许所有vlan通过
2）进行g1/0/1和g1/0/2端口，关闭stp，开启flush报文发送和接受功能

注：
1.记得把instance 0设置为某个smart-link组的保护vlan，否则上游交换机会不断收到flush报文
1.配置的端口要关闭stp
2.所有端口都要开启lush报文发送和接受功能
3.控制vlan记得要创建

SW4的配置：

[SW4]vlan 10
[SW4-vlan10]vlan 20
[SW4-vlan20]vlan 30
[SW4-vlan30]vlan 100
[SW4-vlan100]vlan 200
[SW4-vlan200]int g1/0/1
[SW4-GigabitEthernet1/0/1]port link-type trunk
[SW4-GigabitEthernet1/0/1]port trunk permit vlan all
[SW4-GigabitEthernet1/0/1]int g1/0/2
[SW4-GigabitEthernet1/0/2]port link-type trunk
[SW4-GigabitEthernet1/0/2]port trunk permit vlan all
[SW4-GigabitEthernet1/0/2]quit
[SW4]stp region-configuration
[SW4-mst-region]instance 1 vlan 10 20
[SW4-mst-region]instance 2 vlan 30 40
[SW4-mst-region]int g1/0/1
[SW4-GigabitEthernet1/0/1]undo stp enable  //关闭stp
[SW4-GigabitEthernet1/0/1]int g1/0/2
[SW4-GigabitEthernet1/0/2]undo stp enable
[SW4-GigabitEthernet1/0/2]smart-link group 1
[SW4-smlk-group1]protected-vlan reference-instance 1 //设置保护vlan
[SW4-smlk-group1]protected-vlan reference-instance 0 //很重要的一步，也很容易忘记
[SW4-smlk-group1]flush enable control-vlan 100  //设置控制vlan
[SW4-smlk-group1]port g1/0/1 primary  //设置g1/0/1为master端口
[SW4-smlk-group1]port g1/0/2 secondary
[SW4-smlk-group1]preemption mode role  //设置master端口自动抢占角色
[SW4-smlk-group1]smart-link group 2
[SW4-smlk-group2]protected-vlan reference-instance 2
[SW4-smlk-group2]flush enable control-vlan 200
[SW4-smlk-group2]port g1/0/1 secondary
[SW4-smlk-group2]port g1/0/2 primary
[SW4-smlk-group2]preemption mode role

SW2的配置：

[SW2]vlan 10
[SW2-vlan10]vlan 20
[SW2-vlan20]vlan 30
[SW2-vlan30]vlan 100
[SW2-vlan100]vlan 200
[SW2-vlan200]int g1/0/1
[SW2-GigabitEthernet1/0/1]port link-type trunk
[SW2-GigabitEthernet1/0/1]port trunk permit vlan all
[SW2-GigabitEthernet1/0/1]int g1/0/2
[SW2-GigabitEthernet1/0/2]port link-type trunk
[SW2-GigabitEthernet1/0/2]port trunk permit vlan all
[SW2-GigabitEthernet1/0/2]int g1/0/1
[SW2-GigabitEthernet1/0/1]undo stp enable
[SW2-GigabitEthernet1/0/1]s

[SW2-GigabitEthernet1/0/1]int g1/0/2
[SW2-GigabitEthernet1/0/2]undo stp enable
[SW2-GigabitEthernet1/0/2]smart-link flush enable control-vlan 100 200
[SW2-GigabitEthernet1/0/2]monitor-link group 1
[SW2-mtlk-group1]port g1/0/1 uplink  //设置g1/0/1为上行端口
[SW2-mtlk-group1]port g1/0/2 downlink  //设置g1/0/2为下行端口

SW3的配置：

[SW3]vlan 10
[SW3-vlan10]vlan 20
[SW3-vlan20]vlan 30
[SW3-vlan30]vlan 100
[SW3-vlan100]vlan 200
[SW3-vlan200]int g1/0/1
[SW3-GigabitEthernet1/0/1]port link-type trunk
[SW3-GigabitEthernet1/0/1]port trunk permit vlan all
[SW3-GigabitEthernet1/0/1]int g1/0/2
[SW3-GigabitEthernet1/0/2]port link-type trunk
[SW3-GigabitEthernet1/0/2]port trunk permit vlan all
[SW3-GigabitEthernet1/0/2]int g1/0/1
[SW3-GigabitEthernet1/0/1]undo stp enable
[SW3-GigabitEthernet1/0/1]smart-link flush enable control-vlan 100 200  //让g1/0/1发送和接受flush报文
[SW3-GigabitEthernet1/0/1]int g1/0/2
[SW3-GigabitEthernet1/0/2]undo stp enable
[SW3-GigabitEthernet1/0/2]smart-link flush enable control-vlan 100 200
[SW3-GigabitEthernet1/0/2]monitor-link group 1
[SW3-mtlk-group1]port g1/0/1 uplink  //设置g1/0/1为上行端口
[SW3-mtlk-group1]port g1/0/2 downlink  //设置g1/0/2为下行端口

SW1的配置：

[SW1]vlan 10
[SW1-vlan10]vlan 20
[SW1-vlan20]vlan 30
[SW1-vlan30]vlan 100
[SW1-vlan100]vlan 200
[SW1-vlan200]int g1/0/1
[SW1-GigabitEthernet1/0/1]port link-type trunk
[SW1-GigabitEthernet1/0/1]port trunk permit vlan all
[SW1-GigabitEthernet1/0/1]int g1/0/2
[SW1-GigabitEthernet1/0/2]port link-type trunk
[SW1-GigabitEthernet1/0/2]port trunk permit vlan all

华三hcl配置smart-link

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