Per-Hop Congestion Management

• Diffserv PHB scheduling mechanisms differentiate between classes during congestion to implement the differentiated SLA scheme:

  • Expedited Forwarding (EF)
    Dedicated low delay queue: PQ
    
    i.e. for VoIP
  • Assured Forwarding (AF)
    n Class-based queues ? m drop preferences: WFQ
    
    i.e. for business
  • Default (best effort)
    i.e. for everything else
    

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