生成樹的配置
概念stp-生成樹協議 rstp-快速生成樹協議，mstp-多生成樹協議
根橋：根橋在全網中有且只有一個，其它設備則稱爲葉子節點。
根端口：所謂根端口，是指非根橋設備上離根橋最近的端口。
根端口負責與根橋進行通信。非根橋設備上有且只有一個根端口，根橋上沒有根端口。
MST域：（Multiple Spanning Tree Regions，多生成樹域）是由交換網絡中的多臺設
備以及它們之間的網段所構成（域內設備都使能了生成樹協議，域名相同，映射關係配置相同）
MSTI:一個MST域可以通過MSTP協議生成多顆生成樹，各個生成樹之間獨立並分別與對應的vlan對應
每顆生成樹都稱爲一個MSTI （多生成樹實例）
基本配置
1 配置stp模式（默認開啓MSTP）
2 配置MST域（使用命令激活或者是全局使能生成樹協議纔會生效）
進入域視圖，配置域名（默認的是mac地址），配置vlan映射表，配置修訂級別
激活mst域配置(必選)
3 配置根橋和備份根橋
4 配置設備優先級
5 配置MST域最大跳數
6 配置端口路徑開銷，配置端口優先級
步驟：
1 交換機上創建vlan，設置trunk口，允許相應的vlan通過
2 配置MST域的域名，綁定vlan配置MSTP修訂級別
3 激活MST域的配置
4 配置根橋
5 全局開啓MSTP協議
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