What happens when a root port fails in RSTP?

What happens when a root port fails in RSTP?

• A. The optimal alternate port becomes the root port
• B. Communication is halted until reconfiguration
• C. All ports switch to a Discarding state
• D. A notification is sent to all devices immediately

Answer: (A)

When a root port fails in Rapid Spanning Tree Protocol (RSTP), the functionality of the network is designed to ensure that alternative pathways can be utilized without significant disruption. In this context, the optimal alternate port, which has already been identified as a potential backup route, becomes the new root port. This transition occurs quickly, allowing the network to maintain connectivity and resilience in the face of a port failure. The protocol operates under the principle of quickly converging to a new topology. When the designated root port fails, RSTP can quickly switch to the optimal alternate port, which is pre-calculated and ready to take over as soon as the failure is detected. This allows for minimal downtime and preserves the efficiency and performance of the network. The other choices imply actions that would either lead to network disruptions or a lack of response, which do not align with the rapid convergence feature of RSTP. Thus, the selection of the optimal alternate port as the new root port reflects a key advantage of RSTP, ensuring that the network remains stable and operational despite failures.

When a root port fails in Rapid Spanning Tree Protocol (RSTP), the functionality of the network is designed to ensure that alternative pathways can be utilized without significant disruption. In this context, the optimal alternate port, which has already been identified as a potential backup route, becomes the new root port. This transition occurs quickly, allowing the network to maintain connectivity and resilience in the face of a port failure.

The protocol operates under the principle of quickly converging to a new topology. When the designated root port fails, RSTP can quickly switch to the optimal alternate port, which is pre-calculated and ready to take over as soon as the failure is detected. This allows for minimal downtime and preserves the efficiency and performance of the network.

The other choices imply actions that would either lead to network disruptions or a lack of response, which do not align with the rapid convergence feature of RSTP. Thus, the selection of the optimal alternate port as the new root port reflects a key advantage of RSTP, ensuring that the network remains stable and operational despite failures.