Why do I need to set an STP cost value after STP is enabled on an Eth-Trunk

After STP is enabled on an Eth-Trunk, STP cost values change when member interfaces on the Eth-Trunk change. If the Eth-Trunk is the root interface on the STP, the STP protocol will recalculate the topology of the network connected to the Eth-Trunk. If some interfaces on the network connect to terminals such as PCs and are not configured as edge interfaces, services will be interrupted for 30 seconds.

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