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Difficulty: EasyRapid PVST+ Spanning Tree Protocol Operations and Roles

Which two statements accurately describe port roles, states, and configuration rules in Rapid PVST+? (Select two choices.)

  1. An Alternate port provides a backup path to the Root Bridge and remains in the discarding state under normal operation.Answer
  2. Rapid PVST+ removes the 802.1D Listening port state and consolidates non-forwarding states into the Discarding state.Answer
  3. C
    Switch bridge priority values can be configured using any single integer value between 1 and 65,535.
  4. D
    PortFast should be configured on inter-switch trunk connections to accelerate Spanning Tree convergence.

Answer

The correct statements are that an Alternate port provides a backup path to the Root Bridge while remaining in a discarding state, and that Rapid PVST+ eliminates the 802.1D Listening state by using the Discarding state.
Rapid PVST+ introduces the Alternate port role, which provides an instant backup path to the Root Bridge while staying in a discarding state. Additionally, Rapid PVST+ streamlines the IEEE 802.1D port states (Disabled, Blocking, Listening, Learning, Forwarding) down to three operational states: Discarding, Learning, and Forwarding.

Step-by-Step Solution

1
Evaluate the role of an Alternate port in Rapid PVST+.
Confirm that an Alternate port receives BPDUs from another switch and acts as an alternate path to the Root Bridge in the discarding state.
RSTP/Rapid PVST+ defines Alternate ports for fast convergence when a Root port link fails.
2
Evaluate Rapid PVST+ operational port states.
Identify that 802.1w simplifies port states to Discarding, Learning, and Forwarding, combining Disabled, Blocking, and Listening into Discarding.
This structural simplification enables faster overall protocol operation.
3
Verify bridge priority increments and PortFast guidelines.
Reject custom non-multiplier priority values and reject applying PortFast on switch interconnects.
Priority values must adhere to steps of 4096 due to the System ID Extension, and PortFast is reserved exclusively for edge access interfaces.

Key Concept

Rapid PVST+ Port Roles, States, and Priority Calculations
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Topics

Rapid PVST+ Spanning Tree Protocol Operations and Roles

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