一、拓扑结构
二、配置要求：
Switch 1和Switch 2为汇聚层设备，Switch 3和Switch 4为接入层设备。VLAN 10、VLAN30在汇聚层设备终结。配置实例1 和实例3 的树根分别为Switch
1和Switch 2。
VLAN 10 的报文沿着实例 1 转发，VLAN 30 沿着实例3 转发，VLAN 20 沿着实例 0 转发。
三、配置步骤：
(1) 配置Switch 1
#进入 MST 域视图。
system-view
[SW1]stp region-configuration
#配置MST 域的域名、VLAN 映射关系和修订级别。
[SW1-mst-region]region-name example
[SW1-mst-region]instance 1 vlan 10
[SW1-mst-region]instance 3 vlan 30
[SW1-mst-region]revision-level 0
#手工**MST 域的配置。
[SW1-mst-region]active region-configuration
#定义Switch 1 为实例1 的树根。
[SW1]stp instance 1 root primary
#Switch 1 各端口配置相应VLAN
#GigabitEthernet 1/0/1端口
[SW1]interface GigabitEthernet 1/0/1
[SW1-GigabitEthernet1/0/1]port link-type trunk
[SW1-GigabitEthernet1/0/1]port trunk permit vlan all
[SW1-GigabitEthernet1/0/1]undo port trunk permit vlan 1
#GigabitEthernet 1/0/2端口
[SW1]interface GigabitEthernet 1/0/2
[SW1-GigabitEthernet1/0/2]port link-type trunk
[SW1-GigabitEthernet1/0/2]port trunk permit vlan 10 20
[SW1-GigabitEthernet1/0/2]undo port trunk permit vlan 1
#GigabitEthernet 1/0/3端口
[SW1]interface GigabitEthernet 1/0/3
[SW1-GigabitEthernet1/0/3]port link-type trunk
[SW1-GigabitEthernet1/0/3]port trunk permit vlan 20 30
[SW1-GigabitEthernet1/0/3]undo port trunk permit vlan 1
(2) 配置Switch 2
#进入 MST 域视图。
system-view
[SW2]stp region-configuration
#配置MST 域的域名、VLAN 映射关系和修订级别。
[SW2-mst-region]region-name example
[SW2-mst-region]instance 1 vlan 10
[SW2-mst-region]instance 3 vlan 30
[SW2-mst-region]revision-level 0
#手工**MST 域的配置。
[SW2-mst-region]active region-configuration
#定义Switch 2 为实例 3 的树根。
[SW2]stp instance 3 root primary
#Switch 2 各端口配置相应VLAN
#GigabitEthernet 1/0/1端口
[SW2]interface GigabitEthernet 1/0/1
[SW2-GigabitEthernet1/0/1]port link-type trunk
[SW2-GigabitEthernet1/0/1]port trunk permit vlan all
[SW2-GigabitEthernet1/0/1]undo port trunk permit vlan 1
#GigabitEthernet 1/0/2端口
[SW2]interface GigabitEthernet 1/0/2
[SW2-GigabitEthernet1/0/2]port link-type trunk
[SW2-GigabitEthernet1/0/2]port trunk permit vlan 20 30
[SW2-GigabitEthernet1/0/2]undo port trunk permit vlan 1
#GigabitEthernet 1/0/3端口
[SW2]interface GigabitEthernet 1/0/3
[SW2-GigabitEthernet1/0/3]port link-type trunk
[SW2-GigabitEthernet1/0/3]port trunk permit vlan 10 20
[SW2-GigabitEthernet1/0/3]undo port trunk permit vlan 1
(3) 配置Switch 3
#进入 MST 域视图。
system-view
[SW3]stp region-configuration
#配置MST 域的域名、VLAN 映射关系和修订级别。
[SW3-mst-region]region-name example
[SW3-mst-region]instance 1 vlan 10
[SW3-mst-region]instance 3 vlan 30
[SW3-mst-region]revision-level 0
#手工**MST 域的配置。
[SW3-mst-region]active region-configuration
#Switch 3 各端口配置相应VLAN
#GigabitEthernet 1/0/2端口
[SW3]interface GigabitEthernet 1/0/2
[SW3-GigabitEthernet1/0/2]port link-type trunk
[SW3-GigabitEthernet1/0/2]port trunk permit vlan 10 20
[SW3-GigabitEthernet1/0/2]undo port trunk permit vlan 1
#GigabitEthernet 1/0/3端口
[SW3]interface GigabitEthernet 1/0/3
[SW3-GigabitEthernet1/0/3]port link-type trunk
[SW3-GigabitEthernet1/0/3]port trunk permit vlan 20 30
[SW3-GigabitEthernet1/0/3]undo port trunk permit vlan 1
四、验证结果
#查看Switch 1的MSTP信息
[SW1]dis stp brief
MST ID Port Role STP State Protection
0 GigabitEthernet1/0/1 DESI FORWARDING NONE
0 GigabitEthernet1/0/2 DESI FORWARDING NONE
0 GigabitEthernet1/0/3 DESI FORWARDING NONE
1 GigabitEthernet1/0/1 DESI FORWARDING NONE
1 GigabitEthernet1/0/2 DESI FORWARDING NONE
3 GigabitEthernet1/0/1 ROOT FORWARDING NONE
3 GigabitEthernet1/0/3 DESI FORWARDING NONE
#查看Switch 2的MSTP信息
[SW2]dis stp brief
MST ID Port Role STP State Protection
0 GigabitEthernet1/0/1 ROOT FORWARDING NONE
0 GigabitEthernet1/0/2 DESI FORWARDING NONE
0 GigabitEthernet1/0/3 DESI FORWARDING NONE
1 GigabitEthernet1/0/1 MAST FORWARDING NONE
1 GigabitEthernet1/0/3 DESI FORWARDING NONE
3 GigabitEthernet1/0/1 MAST FORWARDING NONE
3 GigabitEthernet1/0/2 DESI FORWARDING NONE
#查看Switch 3的MSTP信息
[SW3]dis stp brief
MST ID Port Role STP State Protection
0 GigabitEthernet1/0/2 ALTE DISCARDING NONE
0 GigabitEthernet1/0/3 ROOT FORWARDING NONE
1 GigabitEthernet1/0/2 ALTE DISCARDING NONE
1 GigabitEthernet1/0/3 ROOT FORWARDING NONE
#查看Switch 4的MSTP信息
[SW4]dis stp brief
MST ID Port Role STP State Protection
0 GigabitEthernet1/0/2 ROOT FORWARDING NONE
0 GigabitEthernet1/0/3 ALTE DISCARDING NONE
3 GigabitEthernet1/0/2 ROOT FORWARDING NONE
3 GigabitEthernet1/0/3 ALTE DISCARDING NONE