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Protocollo STP

AT

andrea turchet

Transcript

Protocollo STP

Ridondaze

Problemi principali delle reti sono i Loop:

-Frame duplicati

-Broadcast Storm

Ridondanze

Rete

STP protocol

Viene utilizzato per eliminare le ridondanze

utilizza tecnologie del livello 2

STP protocol

Elementi:

Spanning Tree Protocol

  • Root Bridge

  • Bridge

  • BPDU Frame

Bridge Protocl Data Units

BPDU

frame contenente diverse informazioni, quali:

  • Root ID
  • Bridge ID
  • Patch Cost
  • Port ID
  • Message Age
  • Max Age

Funzionamento

  • Elezione del Root Bridge.

  • Definizione dei ruoli delle porte.

-Porte in stato di Forwarding

-Designated Port (DP)

funzionamento

Stati delle porte

Stati delle porte

1. disabled

2. blocking (blocco)

3. listening (ascolto)

4. learning (apprendimento)

5. forwarding (trasmissione)

Vantaggi

Svantaggi

  • Tempi lenti nella modifica

  • La banda viene limitata
  • Elimina il problema dei loop.

  • Scalabile.

  • Gestione Autonoma.

vantaggi

&

svantaggi

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