Description: Each switch has an unique 8-byte bridge identifier (bridge ID), which determines the selection of the root switch. The two most-significant bytes are used for the switch priority, and the remaining six bytes are derived from the switch base MAC address. When you change the switch priority value, you change the probability that the switch will be elected as the root switch. Configuring a higher value decreases the probability; a lower value increases the probability.

The configured value for the MstpBridgeProtoParamPriority should be completed by a fixed offsett, depending on the Mstp-Instance ID. That means, a configured priority-value of 4097 is valid for Mstp instance 1. Instance 2 will use 4098 in that case and instance 32 will have a MstpBridgeProtoParamPriority of 4128. Default value should be 32769 for MSTP-Instance 1 and 32800 for instance 32.