SE 2014年4月29日

交换网络中有vlan1 到20个vlan，要求使用MSTP技术实现vlan的负载分担。

SW2为实例1（vlan1-vlan10）的主根，SW3为备根

SW3为实例2（vlan11-vlan20）的主根，SW2为备根

步骤：

1、  完成每个交换机VLAN的创建

[SW1]vlan 1 to 20

[SW2]vlan 1 to 20

[SW3]vlan 1 to 20

2、  完成每个交换机trunk的设置

[SW1-Ethernet0/4/0]port link-type trun

[SW1-Ethernet0/4/0]port trunk permit vlan 1 to 20

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

[SW1-Ethernet0/4/1]port trunk permit vlan 1 to 20
[SW2-Ethernet0/4/0]port link-type trunk

[SW2-Ethernet0/4/0]port trunk permit vlan 1 to 20

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

[SW3-Ethernet0/4/1]port trunk permit vlan  1 to 20

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

[SW3-Ethernet0/4/2]port trunk permit vlan 1 to 20

3、  开启STP，设置模式为MSTP

[SW1]stp enable

[SW1]stp mode mstp

[SW2]stp mode mstp

[SW2]stp enable

SW3]stp enable

[SW3]stp mode mstp

4、  创建生成树实例，完成实例和VLAN映射

[SW3]stp region-configuration

[SW3-mst-region]region-name H3C

[SW3-mst-region]revision-level 0

[SW3-mst-region]instance
1 vlan 1 to 10

[SW3-mst-region]instance 2 vlan 11 to 20

[SW3-mst-region]active 
region-configuration

[SW1]stp region-configuration

[SW1-mst-region]region-name H3C

[SW1-mst-region]instance 1 vlan 1 to 10

[SW1-mst-region]instance 2 vlan 11 to 20

[SW1-mst-region]active region-configuration

[SW2]stp region-configuration

[SW2-mst-region]region-name H3C

[SW2-mst-region]revision-level 0

[SW2-mst-region]instance 1 vlan 1 to 10

[SW2-mst-region]instance 2 vlan 11 to 20

[SW2-mst-region]active region-configuration

5、  手工指定实例的根桥和备份根桥

[SW2]stp instance 1 root primary

[SW3]stp instance 1 root secondary

[SW3]stp instance 2 root primary

[SW2]stp instance 2 root secondary

6、  结果测试

查看instance 1的主根

查看instance 1的备份根

查看instance 2的主根

查看instance 2的备份根