On the network shown in the figure below, SW1, SW2 and SW3 are deployed. SW1 is the root bridge, link congestion occurs between SW1 and SW2, and SW2 cannot receive configuration BPDUs sent by the root bridge. Given this information, which of the following spanning tree protection mechanisms needs to be configured to prevent problems caused by link congestion? 
Definitions:
Enacted Behaviors
Observable actions taken by individuals, often in response to social norms or environments.
Boredom
A state of weariness and dissatisfaction arising from a lack of interest or engagement.
Depression
A state of mental distress typified by ongoing depressive mood or the inability to find pleasure in activities, severely disrupting daily life performance.
Anxiety
An emotion of concern, apprehension, or discomfort, usually in anticipation of a forthcoming event or regarding something whose result is not yet determined.
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