#拓扑结构
生成树的配置
概念stp-生成树协议 rstp-快速生成树协议，mstp-多生成树协议
根桥：根桥在全网中有且只有一个，其它设备则称为叶子节点。
根端口：所谓根端口，是指非根桥设备上离根桥最近的端口。
根端口负责与根桥进行通信。非根桥设备上有且只有一个根端口，根桥上没有根端口。
MST域：（Multiple Spanning Tree Regions，多生成树域）是由交换网络中的多台设
备以及它们之间的网段所构成（域内设备都使能了生成树协议，域名相同，映射关系配置相同）
MSTI:一个MST域可以通过MSTP协议生成多颗生成树，各个生成树之间独立并分别与对应的vlan对应
每颗生成树都称为一个MSTI （多生成树实例）
基本配置
1 配置stp模式（默认开启MSTP）
2 配置MST域（使用命令激活或者是全局使能生成树协议才会生效）
进入域视图，配置域名（默认的是mac地址），配置vlan映射表，配置修订级别
激活mst域配置(必选)
3 配置根桥和备份根桥
4 配置设备优先级
5 配置MST域最大跳数
6 配置端口路径开销，配置端口优先级
步骤：
1 交换机上创建vlan，设置trunk口，允许相应的vlan通过
2 配置MST域的域名，绑定vlan配置MSTP修订级别
3 激活MST域的配置
4 配置根桥
5 全局开启MSTP协议
配置：
A
<H3C>system-view
[H3C]stpregion-configuration
[H3C-mst-region]region-nameexample
[H3C-mst-region]instance1 vlan 10
[H3C-mst-region]instance2 vlan 20
[H3C-mst-region]instance3 vlan 30
[H3C-mst-region]revision-level0
[H3C-mst-region]activeregion-configuration
[H3C-mst-region]exit
[H3C]stpinstance 1 root primary
[H3C]stp global enable
[H3C]intg1/0/1
[H3C-GigabitEthernet1/0/1]portlink-type trunk
[H3C-GigabitEthernet1/0/1]porttrunk permit vlan 10 20
[H3C-GigabitEthernet1/0/1]intg1/0/3
[H3C-GigabitEthernet1/0/3]portlink-type trunk
[H3C-GigabitEthernet1/0/3]porttrunk permit vlan 20 30
[H3C-GigabitEthernet1/0/3]intg1/0/2
[H3C-GigabitEthernet1/0/2]portlink-type trunk
[H3C-GigabitEthernet1/0/2]porttrunk permit vlan all
[H3C]vlan10 to 40
B
<H3C>system-view
[H3C]stpregion-configuration
[H3C-mst-region]region-nameexample
[H3C-mst-region]instance1 vlan 10
[H3C-mst-region]instance2 vlan 20
[H3C-mst-region]instance3 vlan 30
[H3C-mst-region]revision-level0
[H3C-mst-region]activeregion-configuration
[H3C-mst-region]exit
[H3C]stpinstance 1 root primary
[H3C]stpglobal enable
[H3C]intg1/0/2
[H3C-GigabitEthernet1/0/2]portlink-type trunk
[H3C-GigabitEthernet1/0/2]porttrunk permit vlan all
[H3C-GigabitEthernet1/0/2]intg1/0/2
[H3C-GigabitEthernet1/0/2]portlink-type trunk
[H3C-GigabitEthernet1/0/2]porttrunk permit vlan 10 20
[H3C-GigabitEthernet1/0/2]intg1/0/1
[H3C-GigabitEthernet1/0/1]portlink-type trunk
[H3C-GigabitEthernet1/0/1]porttrunk permit vlan 20 30
[H3C]vlan10 to 40
C
<H3C>system-view
[H3C]stpregion-configuration
[H3C-mst-region]region-nameexample
[H3C-mst-region]instance1 vlan 10
[H3C-mst-region]instance2 vlan 20
[H3C-mst-region]instance3 vlan 30
[H3C-mst-region]revision-level0
[H3C-mst-region]activeregion-configuration
[H3C-mst-region]exit
[H3C]stpinstance 4 root primary
[H3C]stp global enable
[H3C]intg1/0/1
[H3C-GigabitEthernet1/0/1]portlink-type trunk
[H3C-GigabitEthernet1/0/1]porttrunk permit vlan 10 20
[H3C-GigabitEthernet1/0/1]intg1/0/2
[H3C-GigabitEthernet1/0/2]portlink-type trunk
[H3C-GigabitEthernet1/0/2]porttrunk permit vlan 10 20
[H3C-GigabitEthernet1/0/2]intg1/0/3
[H3C-GigabitEthernet1/0/3]portlink-type trunk
[H3C-GigabitEthernet1/0/3]porttrunk permit vlan 20 40
[H3C]vlan10 to 40
D
<H3C>system-view
[H3C]stpregion-configuration
[H3C-mst-region]region-nameexample
[H3C-mst-region]instance1 vlan 10
[H3C-mst-region]instance2 vlan 20
[H3C-mst-region]instance3 vlan 30
[H3C-mst-region]revision-level0
[H3C-mst-region]activeregion-configuration
[H3C-mst-region]exit
[H3C]stpinstance 0 root primary
[H3C]stpglobal enable
[H3C]intg1/0/1
[H3C-GigabitEthernet1/0/1]portlink-type trunk
[H3C-GigabitEthernet1/0/1]porttrunk permit vlan 20 30
[H3C-GigabitEthernet1/0/1]intg1/0/2
[H3C-GigabitEthernet1/0/2]portlink-type trunk
[H3C-GigabitEthernet1/0/2]porttrunk permit vlan 20 30
[H3C-GigabitEthernet1/0/2]intg1/0/3
[H3C-GigabitEthernet1/0/3]portlink-type trunk
[H3C-GigabitEthernet1/0/3]porttrunk permit vlan 20 40
[H3C-GigabitEthernet1/0/3]exit
[H3C]vlan10 to 40
验证：
