QTECH QSW-3400 Инструкция по настройке - Manual (Page 183)

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20.4 MSTP Troubleshooting

In order to run the MSTP on the switch port, the MSTP has to be enabled globally. If
the MSTP is not enabled globally, it can’t be enabled on the port.

The MSTP parameters co work with each other, so the parameters should meet the
following conditions. Otherwise, the MSTP may work incorrectly.
 2×(Bridge_Forward_Delay -1.0 seconds) >= Bridge_Max_Age
 Bridge_Max_Age >= 2 ×(Bridge_Hello_Time + 1.0 seconds)

When users modify the MSTP parameters, they have to be sure about the changes of
the topologies. The global configuration is based on the bridge. Other configurations
are based on the individual instances.