This read-write value, 0 to 65535, sets the priority assigned to this bridge for the Spanning Tree algorithm, which the unit uses to help determine the overall bridged network topology. A lower priority value makes this bridge more likely to be elected the root of the spanning tree compared to bridges with a higher value. For example, an administrator who wants this specific unit to always become the root bridge of the network would set this object to a low value like 0, so it wins root election over other bridges with higher default priorities.