MSTP是IEEE 802.1s中提出的一种STP和VLAN结合使用的新协议，它既继承了RSTP端口快速迁移的优点，又解决了RSTP中不同vlan必须运行在同一棵生成树上的问题。本次实验模拟MSTP实验创建起来后的变化，本次实验的主要是主备冗余，S1、S2作为核心交换机工具/原料morewin7-64（笔记本内存=4G）eNSP方法/步骤1/9分步阅读

一、搭建本次实验拓扑结构

四台交换机，两台核心，两台接入

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二、配置实验环境所需要的VLAN信息

vlan batch 10 20 30 40 100Info: This operation may take a few seconds. Please wait for a moment...done.vlan batch 10 20 30 40 100Info: This operation may take a few seconds. Please wait for a moment...done.vlan batch 10 20 30 40 100Info: This operation may take a few seconds. Please wait for a moment...done.vlan batch 10 20 30 40 100Info: This operation may take a few seconds. Please wait for a moment...done.

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三、将接口加入VLAN中

int g0/0/4po li trpo tr all vl 10 20 30 40 100

int g0/0/3po li trpo tr all vl 10 20 30 40 100

int g0/0/1po li trpo tr all vl 10 20 30 40 100

int g0/0/2po li trpo tr all vl 10 20 30 40 100

命令是简打的，没有把所有接口信息都添加，请自行添加所有接口信息的VLAN

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四、配置MSTP，定义VLAN属于实例的信息

S1]stp mode mstp stp region-configuration region-name RG1 instance 1 vlan 10 20 100instance 2 vlan 30 40active region-configuration Info: This operation may take a few seconds. Please wait for a moment....done. stp mode mstp stp region-configuration region-name RG1 instance 1 vlan 10 20 100instance 2 vlan 30 40active region-configuration Info: This operation may take a few seconds. Please wait for a moment....done.

SW3和SW4也是一样的

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五、查看MSTP实例和VLAN映射关系

dis stp reOper configuration Format selector :0 Region name :RG1 Revision level :0

Instance VLANs Mapped 0 1 to 9, 11 to 19, 21 to 29, 41 to 99, 101 to 4094 1 10, 20, 100 2 30 to 40

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六、修改交换机的MSTP实例的优先级

stp instance 1 priority 4096 stp instance 2 priority 8192 stp instance 2 priority 4096 stp instance 1 priority 8192

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七、查看实例1和实例2的状态信息

dis stp ins 1--------------MSTI Bridge ID :4096.4c1f-ccee-804fMSTI RegRoot/IRPC :4096.4c1f-ccee-804f / 0MSTI RootPortId :0.0Master Bridge :32768.4c1f-cc2f-665aCost to Master :20000TC received :8TC count per hello :0Time since last TC :0 days 1h:34m:32sNumber of TC :11Last TC occurred :Eth-Trunk1

SW2sysEnter system view, return user view with Ctrl+Z.dis stp ins 2--------------MSTI Bridge ID :4096.4c1f-cc39-7058MSTI RegRoot/IRPC :4096.4c1f-cc39-7058 / 0MSTI RootPortId :0.0Master Bridge :32768.4c1f-cc39-7058Cost to Master :0TC received :0TC count per hello :0Time since last TC :0 days 1h:52m:54sNumber of TC :7

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八、查看MSTP实例1的端口信息

dis stp ins 1 briMSTID Port Role STP State Protection 1 GigabitEthernet0/0/3 DESI FORWARDING NONE 1 GigabitEthernet0/0/4 DESI FORWARDING NONE 1 GigabitEthernet0/0/24 DESI FORWARDING NONE 1 Eth-Trunk1 DESI FORWARDING NONEdis stp ins 2 briMSTID Port Role STP State Protection 2 GigabitEthernet0/0/3 DESI FORWARDING NONE 2 GigabitEthernet0/0/4 DESI FORWARDING NONE 2 GigabitEthernet0/0/24 DESI FORWARDING NONE 2 Eth-Trunk1 DESI FORWARDING NONE

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九、查看MSTP实例2的端口信息 dis stp ins 1 briMSTID Port Role STP State Protection 1 GigabitEthernet0/0/3 ALTE DISCARDING NONE 1 GigabitEthernet0/0/4 MAST FORWARDING NONEdis stp ins 2 briMSTID Port Role STP State Protection 2 GigabitEthernet0/0/3 ALTE DISCARDING NONE 2 GigabitEthernet0/0/4 MAST FORWARDING NONE

注意事项

注意VLAN信息和接口信息配置

观察被阻塞的端口信息，观察拓扑结构的变化