MSTP：一个VLAN一颗生成树，实现链路的负载均衡。
MSTP的命令：
stp mode mstp
stp region-configuration
region-name huawei
revision-level 1
instance 1 vlan 10
instance 2 vlan 20
active region-configuration
stp instance 1 root primary
stp instance 2 root secondary（根据具体情况而定）
拓扑图：
SW1配置文件：
#
sysname sw1
#
vlan batch 10 20
#
interface Ethernet0/0/1
port hybrid pvid vlan 10
port hybrid untagged vlan 10 20
#
interface GigabitEthernet0/0/2
port link-type trunk
port trunk allow-pass vlan 10 20
#
interface GigabitEthernet0/0/1
port hybrid pvid vlan 10
port hybrid untagged vlan 10 20
SW2配置文件：
#
sysname sw2
#
vlan batch 10 20
#
interface Ethernet0/0/1
port hybrid pvid vlan 20
port hybrid untagged vlan 10 20
#
interface GigabitEthernet0/0/2
port link-type trunk
port trunk allow-pass vlan 10 20
#
interface GigabitEthernet0/0/1
port hybrid pvid vlan 20
port hybrid untagged vlan 10 20
SW3配置文件：
#
sysname sw3
#
vlan batch 10 20
interface Ethernet0/0/1
port hybrid pvid vlan 10
port hybrid untagged vlan 10 20
#
interface Ethernet0/0/2
port hybrid pvid vlan 20
port hybrid untagged vlan 10 20
#
interface GigabitEthernet0/0/1
port hybrid pvid vlan 10
port hybrid untagged vlan 10 20
#
interface GigabitEthernet0/0/2
port hybrid pvid vlan 20
port hybrid untagged vlan 10 20
输入display stp brief查看各端口的状态
SW1
SW2
SW3
根据上图可知，SW3的g0/0/1口为AP口，处于blocking状态。
配置MSTP
SW1
stp mode mstp
stp region-configuration
region-name huawei
revision-level 1
instance 1 vlan 10
instance 2 vlan 20
active region-configuration
stp instance 1 root primary
stp instance 2 root secondary
SW2
stp mode mstp
stp region-configuration
region-name huawei
revision-level 1
instance 1 vlan 10
instance 2 vlan 20
active region-configuration
stp instance 2 root primary
stp instance 1 root secondary
SW3
stp mode mstp
stp region-configuration
region-name huawei
revision-level 1
instance 1 vlan 10
instance 2 vlan 20
active region-configuration
配置完之后查看端口状态：
SW1：
SW2：
SW3：
可以看到，SW3的AP口自动进行了转换，不会影响数据的传输。