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Difficulty: MediumRapid PVST+ Spanning Tree Protocol Operations and Roles

An enterprise network administrator is evaluating Layer 2 protocol operations after migrating the switch infrastructure to Rapid PVST+. Which two statements correctly describe Rapid PVST+ port roles and operational state behaviors?

  1. Rapid PVST+ consolidates the legacy 802.1D Disabled, Blocking, and Listening port states into a single Discarding state.Answer
  2. An Alternate port receives BPDUs from neighboring switches and acts as a backup path to the Root Bridge.Answer
  3. C
    Enabling PortFast on switch-to-switch trunk links accelerates convergence without risking transient Layer 2 loops.
  4. D
    The bridge priority value for a VLAN can be configured to any arbitrary integer between 0 and 65535, such as 8000.

Answer

Rapid PVST+ consolidates the legacy Disabled, Blocking, and Listening states into a single Discarding state, and an Alternate port acts as a backup path to the Root Bridge by receiving BPDUs from other switches.
Rapid PVST+ simplifies the standard 802.1D spanning tree model by merging the Disabled, Blocking, and Listening states into a single Discarding state. Furthermore, an Alternate port receives superior BPDUs from neighbor switches, allowing it to immediately assume the Root Port role if the active Root Port loses connectivity.

Step-by-Step Solution

1
Analyze port state changes from standard 802.1D to Rapid PVST+ (802.1w).
Identify that Rapid PVST+ simplifies port states down to Discarding, Learning, and Forwarding.
Combining Disabled, Blocking, and Listening into Discarding streamlines state evaluation.
2
Evaluate the definition and function of the Alternate port role in Rapid PVST+.
Confirm that an Alternate port offers an alternate path toward the Root Bridge when it receives BPDUs from neighboring switches.
Alternate ports provide rapid uplink failover without requiring a full re-convergence cycle.
3
Identify misconceptions regarding PortFast misconfiguration and Bridge Priority increments.
Reject the options asserting arbitrary priority integers (like 8000) and PortFast deployment on inter-switch trunks.
Bridge priorities require increments of 4096 due to the System ID Extension, and PortFast on trunks risks broadcast storms.

Key Concept

Rapid PVST+ Operational States, Port Roles, and Priority Increments
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Topics

Rapid PVST+ Spanning Tree Protocol Operations and Roles

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