A technology consulting firm in Portland, Oregon began experiencing repeated topology recalculations across its switching infrastructure. Shortly after a newly connected device came online in a conference room, spanning-tree convergence events were triggered across multiple distribution switches. Engineers determined that the access-layer interface connected to that device was influencing path-selection decisions, introducing a more favorable bridge priority value into the environment and affecting the established hierarchy. To preserve the intended switching structure and prevent unauthorized devices from altering root selection decisions, which control should be employed?
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