8.10 MSTP

1.创建VLAN

[sw1]vlan batch 11 to 30
[sw2]vlan batch 11 to 30
[sw3]vlan batch 11 to 30

2.配置trunk

[sw1]interface GigabitEthernet 0/0/1
[sw1-GigabitEthernet0/0/1]port link-type trunk 
[sw1-GigabitEthernet0/0/1]port trunk allow-pass vlan all
[sw1]interface GigabitEthernet 0/0/2
[sw1-GigabitEthernet0/0/2]port link-type trunk 
[sw1-GigabitEthernet0/0/2]port trunk allow-pass vlan all 

[sw2]interface GigabitEthernet 0/0/1
[sw2-GigabitEthernet0/0/1]port link-type trunk
[sw2-GigabitEthernet0/0/1]port trunk allow-pass vlan all 
[sw2]interface GigabitEthernet 0/0/3
[sw2-GigabitEthernet0/0/3]port link-type trunk
[sw2-GigabitEthernet0/0/3]port trunk allow-pass vlan all

[SW3]interface GigabitEthernet 0/0/2
[SW3-GigabitEthernet0/0/2]port link-type trunk
[SW3-GigabitEthernet0/0/2]port trunk allow-pass vlan all
[SW3]interface GigabitEthernet 0/0/3
[SW3-GigabitEthernet0/0/3]port link-type trunk
[SW3-GigabitEthernet0/0/3]port trunk allow-pass vlan all

3.配置模式为MSTP

[sw1]stp mode mstp 
[sw2]stp mode mstp 
[sw3]stp mode mstp 

4.配置MST

[sw1]stp region-configuration
[sw1-mst-region]region-name dsrw.com
[sw1-mst-region]instance 1 vlan 11 to 20
[sw1-mst-region]instance 2 vlan 21 to 30
[sw1-mst-region]active region-configuration 

[sw2]stp region-configuration 
[sw2-mst-region]region-name dsrw.com
[sw2-mst-region]instance 1 vlan 11 to 20 
[sw2-mst-region]instance 2 vlan 21 to 30
[SW2-mst-region]active region-configuration 

[SW3]stp region-configuration
[SW3-mst-region]region-name dsrw.com
[SW3-mst-region]instance 1 vlan 11 to 20 
[SW3-mst-region]instance 2 vlan 21 to 30
[SW3-mst-region]active region-configuration 

5.查看MSTP

[sw1]display stp region-configuration 
 Oper configuration
   Format selector    :0             
   Region name        :dsrw.com             
   Revision level     :0

   Instance   VLANs Mapped
      0       1 to 9, 31 to 4094
      1       10 to 20
      2       21 to 30

6.配置实例1的根为SW1,备份根SW2,实例2根为SW2,备份根为SW1

[sw1]stp instance 1 priority 4096 
[sw1]stp instance 2 priority 8192

[sw2]stp instance 1 priority 8192
[sw2]stp instance 2 priority 4096

7.查看mstp信息

[SW3]display stp brief
 MSTID  Port                        Role  STP State     Protection
   0    GigabitEthernet0/0/2        ALTE  DISCARDING      NONE
   0    GigabitEthernet0/0/3        ROOT  FORWARDING      NONE
   1    GigabitEthernet0/0/2        ALTE  DISCARDING      NONE
   1    GigabitEthernet0/0/3        ROOT  FORWARDING      NONE
   2    GigabitEthernet0/0/2        ALTE  DISCARDING      NONE
   2    GigabitEthernet0/0/3        ROOT  FORWARDING      NONE
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