Spanning Tree

 Spanning tree protocol is a set of rules to help remove layer 2 loops in a network.

Root bridge selection:

  • Root Bridge Selection
    • Lowest Bridge ID (BID: MAC)
  • Root Port Selection
    • Lowest root cost
    • Lowest Neighbor BID
    • Lowest Local Port ID
  • Designated Port Selection(per segment)
    • Port on switch with lowest root cost
    • Port on switch with lowest BID
    • Lowest local port ID

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