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Zorluk: KolayRapid PVST+ Spanning Tree Protocol Operations and Roles

Place the steps of the Rapid PVST+ Proposal and Agreement handshake process in the correct chronological order, starting from when a designated switch initiates fast convergence on a point-to-point link to when its port enters the Forwarding state.

  1. 1The designated switch sends a BPDU with the Proposal bit set to the downstream switch.
  2. 2The receiving switch puts its non-edge ports into the Discarding state to perform synchronization.
  3. 3The receiving switch transmits a BPDU with the Agreement bit set back to the designated switch.
  4. 4The designated switch immediately transitions its port from Discarding directly to the Forwarding state.

Cevap

The correct sequence starts with the designated switch proposing the link state, followed by the receiving switch synchronizing non-edge ports, returning an Agreement BPDU, and finally the designated switch transitioning directly to the Forwarding state.
The Rapid PVST+ (802.1w) sync process operates in a strict sequence on point-to-point links: first, a designated port proposes rapid transition; second, the neighbor switch synchronizes by blocking non-edge designated ports; third, the neighbor sends an Agreement BPDU back; fourth, the proposing port immediately moves to the Forwarding state.

Adım Adım Çözüm

1
Identify the initiation of the handshake.
The designated switch transmits a Proposal BPDU to request rapid transition on the point-to-point link.
Rapid PVST+ relies on explicit point-to-point messaging rather than timer-based delays.
2
Determine the synchronization action taken by the receiver.
The receiver puts non-edge ports into the Discarding state.
This guarantees no active loops can form while the topology adapts.
3
Identify the response message.
The receiver sends an Agreement BPDU back to the proposal sender.
The agreement signals that the receiving switch has safely isolated its local ports.
4
Determine the final state transition.
The initiating designated port transitions immediately into the Forwarding state.
Upon receiving agreement, the port moves directly to forwarding without waiting for 802.1D forward delay timers.

Anahtar Kavram

Rapid PVST+ Proposal and Agreement Handshake Mechanism
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Rapid PVST+ Spanning Tree Protocol Operations and Roles

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