S1配置
stp mode mstp
stp region-configuration
region-name a
revision-level 1
instance 1 vlan 10
instance 2 vlan 20
active region-configuration
qu
stp instance 1 root primary
stp instance 2 root secondary
stp global enable
===
S2配置
stp region-configuration
region-name a
revision-level 1
instance 1 vlan 10
instance 2 vlan 20
active region-configuration
qu
stp instance 1 root secondary
stp instance 2 root primary
stp global enable
===
S3配置
stp region-configuration
region-name a
revision-level 1
instance 1 vlan 10
instance 2 vlan 20
active region-configuration
qu
stp bpdu-protection
stp global enable