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Zorluk: KolayTroubleshooting VLAN, Trunking, and Switching Issues

A network administrator needs to ensure that a primary distribution switch is selected as the Spanning Tree Protocol (STP) root bridge across the local switching domain. Which of the following configuration modifications will achieve this goal?

  1. Set the switch's STP bridge priority to the lowest available numerical value.Cevap
  2. B
    Set the switch's STP bridge priority to the highest available numerical value.
  3. C
    Change all switch ports from access mode to trunking mode with identical native VLANs.
  4. D
    Configure full-duplex speed and duplex settings on all uplink interfaces.

Cevap

Set the switch's STP bridge priority to the lowest available numerical value.
In Spanning Tree Protocol (STP), the root bridge is chosen based on the lowest Bridge ID, which is a combination of the configurable bridge priority and the switch MAC address. Decreasing the bridge priority to a lower value ensures that the switch will have a smaller Bridge ID than its peers and will be elected as the root bridge.

Adım Adım Çözüm

1
Identify how Spanning Tree Protocol (STP) selects the root bridge.
STP compares Bridge IDs (Bridge Priority + MAC address) across all switches in the Layer 2 domain.
The root bridge election algorithm awards root bridge status to the switch possessing the lowest numerical Bridge ID.
2
Determine the required configuration adjustment to force a specific switch to win the root bridge election.
Lowering the bridge priority value on the target switch ensures its Bridge ID is smaller than that of all neighboring switches.
Standard STP switches use a default priority of 32768. Lowering this value (e.g., to 4096 or 0) forces the switch to become the root bridge.

Anahtar Kavram

STP Root Bridge Election and Priority Calibration
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Troubleshooting VLAN, Trunking, and Switching Issues

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