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链路聚合多生成树域
多生成树（MST）使用修正的快速生成树（RSTP）协议，叫做多生成树协议（MSTP）
MSTP（Multiple Spanning Tree Protocol，多生成树协议）
将环路网络修剪成为一个无环的树型网络，避免报文在环路网络中的增生和无限循环，同时还提供了数据转发的多个冗余路径，在数据转发过程中实现VLAN 数据的负载均衡。MSTP 兼容STP 和RSTP，并且可以弥补STP 和RSTP 的缺陷。它既可以快速收敛，也能使不同VLAN 的流量沿各自的路径分发，从而为冗余链路提供了更好的负载分担机制。
实验环境：ensp模拟器
Sw1配置：
[sw1]vlan 10
[sw1-vlan10]vlan 20
[sw1-vlan20]vlan 30
[sw1]stp enable
#启动生成树，默认启动mstp
[sw1]dis stp
-------[CIST Global Info][Mode MSTP]-------
CIST Bridge
:32768.4c1f-cc73-940e
Config Times
:Hello 2s MaxAge 20s FwDly 15s MaxHop 20
Active Times
:Hello 2s MaxAge 20s FwDly 15s MaxHop 20
CIST Root/ERPC
:32768.4c1f-cc6c-00b5 / 1
CIST RegRoot/IRPC
:32768.4c1f-cc73-940e / 0
CIST RootPortId
:128.3
BPDU-Protection
:Disabled
TC or TCN received:6
[sw1]stp region-configuration
[sw1-mst-region]region-name liufan #建立域名
[sw1-mst-region]instance 1 vlan 10 20 #建立树1
[sw1-mst-region]instance 2 vlan 30 40 #建立树2
[sw1-mst-region]check region-configuration #查看域
Admin configuration
Format selector :0
Region name :liufan
Revision level :0
Instance VLANs Mapped
0 1 to 9,11 to 19,21 to 29,31 to 39,41 to 4094
1 10,20
2 30,40
[sw1-mst-region]revision-level 1
[sw1-mst-region]active region-configuration #启动域
Info: This operation may take a few seconds. Please wait for a moment...done.
[sw1]inter gig0/0/1
[sw1-GigabitEthernet0/0/1]port link-type trunk
[sw1-GigabitEthernet0/0/1]port trunk allow vlan all
[sw1]inter gig0/0/3
[sw1-GigabitEthernet0/0/3]port link-type trunk
[sw1-GigabitEthernet0/0/3]port trunk allow vlan all
[sw1]inter gig0/0/2
[sw1-GigabitEthernet0/0/2]port link-type trunk
[sw1-GigabitEthernet0/0/2]port trunk allow vlan all
[sw1]inter gig0/0/4
[sw1-GigabitEthernet0/0/4]port link-type trunk
[sw1-GigabitEthernet0/0/4]port trunk allow vlan all
Sw2配置：
[sw2]vlan 10
[sw2-vlan10]vlan 20
[sw2-vlan20]vlan 30
[sw2-vlan30]vlan 40
[sw2]stp region-configuration
[sw2-mst-region]region-name liufan
[sw2-mst-region]instance 1 vlan 10 20
[sw2-mst-region]instance 2 vlan 30 40
[sw2-mst-region]revision-level 1
[sw2-mst-region]active region-configuration
Info: This operation may take a few seconds. Please wait for a moment...done.
[sw2-mst-region]
Nov 28 2012 17:34:52-08:00 sw2 DS/4/DATASYNC_CFGCHANGE:OID 1.3.6.1.4.1.2011.5.25
.191.3.1 configurations have been changed. The current change number is 9,the c
hange loop count is 0,and the maximum number of records is 4095.
[sw2-mst-region]check region
Admin configuration
Format selector :0
Region name :liufan
Revision level :1
Instance VLANs Mapped
0 1 to 9,40
[sw2-GigabitEthernet0/0/4]inter gig0/0/2
[sw2-GigabitEthernet0/0/2]port link-type trunk
[sw2-GigabitEthernet0/0/2]port trunk allow vlan all
[sw2-GigabitEthernet0/0/2]inter gig0/0/4
[sw2-GigabitEthernet0/0/4]port link-type trunk
[sw2-GigabitEthernet0/0/4]port trunk allow vlan all
[sw2-GigabitEthernet0/0/4]inter gig0/0/1
[sw2-GigabitEthernet0/0/1]port link-type trunk
[sw2-GigabitEthernet0/0/1]port trunk allow vlan all
配置sw3：
[sw3]vlan 10
[sw3-vlan10]vlan 20
[sw3-vlan20]vlan 30
[sw3-vlan30]vlan 40
[sw3]stp region-configuration
[sw3-mst-region]region-name liufan
[sw3-mst-region]instance 1 vlan 10 20
[sw3-mst-region]instance 2 vlan 30 40
[sw3-mst-region]revision-level 1
[sw3-mst-region]active region-configuration
[sw3]inter gig0/0/1
[sw3-GigabitEthernet0/0/1]port link-type trunk
[sw3-GigabitEthernet0/0/1]port trunk allow vlan all
[sw3]inter gig0/0/3
[sw3-GigabitEthernet0/0/3]port link-type trunk
[sw3-GigabitEthernet0/0/3]port trunk allow vlan all
配置sw4：
[sw4]vlan 10
[sw4-vlan10]vlan 20
[sw4-vlan20]vlan 30
[sw4-vlan30]vlan 40
[sw4]stp region-configuration
[sw4-mst-region]region-name liufan
[sw4-mst-region]instance 1 vlan 10 20
[sw4-mst-region]instance 2 vlan 30 40
[sw4-mst-region]revision-level 1
[sw4-mst-region]active region-configuration
[sw4]inter gig0/0/1
[sw4-GigabitEthernet0/0/1]port link-type trunk
[sw4-GigabitEthernet0/0/1]port trunk allow vlan all
[sw4]inter gig0/0/3
[sw4-GigabitEthernet0/0/3]port link-type trunk
[sw4-GigabitEthernet0/0/3]port trunk allow vlan all
在sw1和sw2上做链路聚合：
[sw1]port-group 1
[sw1-port-group-1]group-member gig0/0/2
[sw1-port-group-1]group-member gig0/0/4
[sw1-port-group-1]dis port-group all
Portgroup: 1
GigabitEthernet0/0/2
GigabitEthernet0/0/4
[sw2]port-group 1
[sw2-port-group-1]group-member gig0/0/2
[sw2-port-group-1]group-member gig0/0/4
Sw3设置为树2的根：
[sw3]stp instance 2 root primary
[sw3]stp instance 1 root second
Sw4设置为树1的根：
[sw4]stp instance 1 root primary
[sw4]stp instance 2 root second
测试：
[sw2]dis stp instance 1 brief
MSTIDPort
RoleSTP State Protection
1 GigabitEthernet0/0/1 ALTEDISCARDING NONE
1 GigabitEthernet0/0/2 ROOTFORWARDING NONE
1 GigabitEthernet0/0/4 ALTEDISCARDING NONE
[sw2]dis stp instance 2 brief
MSTIDPort
RoleSTP State Protection
2 GigabitEthernet0/0/1 ROOTFORWARDING NONE
2 GigabitEthernet0/0/2 ALTEDISCARDING NONE
2 GigabitEthernet0/0/4 ALTEDISCARDING NONE
[sw3]dis stp instance 1 brief
MSTIDPort
RoleSTP State Protection
1 GigabitEthernet0/0/1 DESIFORWARDING NONE
1 GigabitEthernet0/0/3 ROOTFORWARDING NONE
[sw3]dis stp instance 2 brief
MSTIDPort
RoleSTP State Protection
2 GigabitEthernet0/0/1 DESIFORWARDING NONE
2 GigabitEthernet0/0/3 DESIFORWARDING NONE
[sw1]dis stp instance 1 brief
MSTIDPort
RoleSTP State Protection
1 GigabitEthernet0/0/1 ROOTFORWARDING NONE
1 GigabitEthernet0/0/2 DESIFORWARDING NONE
1 GigabitEthernet0/0/3 DESIFORWARDING NONE
1 GigabitEthernet0/0/4 DESIFORWARDING NONE
[sw1]dis stp instance 2 brief
MSTIDPort
RoleSTP State Protection
2 GigabitEthernet0/0/1 DESIFORWARDING NONE
2 GigabitEthernet0/0/2 DESIFORWARDINGNONE
2 GigabitEthernet0/0/3 ROOTFORWARDING NONE
2 GigabitEthernet0/0/4 DESIFORWARDING NONE
[sw4]dis stp instance 1 brief
MSTIDPort
RoleSTP State Protection
1 GigabitEthernet0/0/1 DESIFORWARDING NONE
1 GigabitEthernet0/0/3 DESIFORWARDING NONE
[sw4]dis stp instance 2 brief
MSTIDPort
RoleSTP State Protection
2 GigabitEthernet0/0/1 ROOTFORWARDING NONE
2 GigabitEthernet0/0/3 DESIFORWARDING NONE （编辑：安卓应用网）
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