MSTP

如图配置：

交换网络中有vlan 1 到10个vlan，要求使用MSTP技术实现vlan的负载分担。SW1为实例1（vlan1-vlan5）的主根，SW2为备根

SW2为实例2（vlan6-vlan10）的主根，SW1为备根

MSTP 实验步骤:

1.保证交换网络中vlan信息同步

SW1

[SW1]vlan 1 to 10

Please wait... Done.

SW2

[SW2]vlan 1 to 10

Please wait... Done.

SW3

[SW3]vlan 1 to 10

Please wait... Done.

2.所有链路封装trunk协议，放行业务vlan

SW1

Int e0/4/1

[SW1-Ethernet0/4/1]port link-t trunk

[SW1-Ethernet0/4/1]port trunk permit vlan 1 to 10

[SW1-Ethernet0/4/0]port link-t trunk

[SW1-Ethernet0/4/0]port trunk permit vlan 1 to 10

SW2

Int e0/4/1

[SW2-Ethernet0/4/2]port link-t trunk

[SW2-Ethernet0/4/2]port trunk permit vlan 1 to 10

[SW2-Ethernet0/4/2]port link-t trunk

[SW2-Ethernet0/4/0]port trunk permit vlan 1 to 10

SW3

Int e0/4/3

[SW3-Ethernet0/4/1]port link-t trunk

[SW3-Ethernet0/4/1]port trunk permit vlan 1 to 10

[SW3-Ethernet0/4/2]port link-t trunk

[SW3-Ethernet0/4/2]port trunk permit vlan 1 to 10

3.启用stp技术（mstp模式）

Stp m stp

4.配置MST域（同步域名/修正级别Vlan对应实例的关系）

SW1

[SW1]stp region-configuration

[SW1-mst-region]region-name 1

[SW1-mst-region] instance 1 vlan 1 to 5

[SW1-mst-region] instance 2 vlan 6 to 10

[SW1-mst-region]active region-configuration

SW2

[SW2]stp region-configuration

[SW2-mst-region]region-name 1

[SW2-mst-region] instance 1 vlan 1 to 5

[SW2-mst-region] instance 2 vlan 6 to 10

[SW2-mst-region]active region-configuration

SW3

[SW3]stp region-configuration

[SW3-mst-region]region-name 1

[SW3-mst-region] instance 1 vlan 1 to 5

[SW3-mst-region] instance 2 vlan 6 to 10

[SW3-mst-region]active region-configuration

5.选择合适的设备作为实例的根桥与备份根桥

SW1

[SW1]stp instance 1 root primary

[SW1]stp instance 2 root secondary

SW2

[SW1]stp instance 2 root primary

[SW1]stp instance 1 root secondary

6.测试

[SW1]dis stp brief

MSTID Port Role STP State Protection

0 Ethernet0/4/0 DESI FORWARDING NONE

0 Ethernet0/4/1 DESI FORWARDING NONE

1 Ethernet0/4/0 DESI FORWARDING NONE

1 Ethernet0/4/1 DESI FORWARDING NONE

2 Ethernet0/4/0 ROOT FORWARDING NONE

2 Ethernet0/4/1 DESI FORWARDING NONE

[SW2]dis stp brief

MSTID Port Role STP State Protection

0 Ethernet0/4/0 ROOT FORWARDING NONE

0 Ethernet0/4/2 DESI FORWARDING NONE

1 Ethernet0/4/0 ROOT FORWARDING NONE

1 Ethernet0/4/

2 DESI FORWARDING NONE

2 Ethernet0/4/0 DESI FORWARDING NONE

2 Ethernet0/4/2 DESI FORWARDING NONE

[SW3]dis stp brief

MSTID Port Role STP State Protection

0 Ethernet0/4/1 ROOT FORWARDING NONE

0 Ethernet0/4/2 ALTE DISCARDING NONE

1 Ethernet0/4/1 ROOT FORWARDING NONE

1 Ethernet0/4/

2 ALTE DISCARDING NONE

2 Ethernet0/4/1 ALTE DISCARDING NONE

2 Ethernet0/4/2 ROOT FORWARDING NONE