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Home › Reti di Calcolatori 2 › Capitolo II - Techniques and architectures for QoS › II.3Traffic and Service Characterization

II.3.4Scheduling

Roberto Bifulco — Fri, 10/17/2008 - 22:39

Per trattare il problema dello scheduling in una rete che supporta la QoS è necessario innanzitutto osservare la comune architettura di un router. In Figure 6 è mostrato uno schema esemplificativo:

I moduli di ingresso (indicati in giallo) trasformano il formato in ingresso in modo che sia trattabile dalla Fabric. Questa viene impostata dall'algoritmo di instradamento ed ha il compito di trasportare ogni byte verso l'appropriato modulo d'uscita. Il modulo di uscita contiene i meccanismi di controllo del servizio, inserendo questi meccanismi in questo punto, si ha una stima più precisa del delay relativo dei pacchetti.

  • II.3.4.1Scheduling policies
  • II.3.4.1.1GPS
‹ II.3.3Queue management up II.3.4.1Scheduling policies ›
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Reti di Calcolatori 2

  • Introduzione
  • Capitolo I - Networks Evolution
    • Communication models
      • Circuit switching
      • Packet Switching
      • Flow Switching
    • A rapidly changing scenario
    • Data and media taxonomy
  • Capitolo II - Techniques and architectures for QoS
    • II.1QoS problems
    • II.2Service Specification
    • II.3Traffic and Service Characterization
      • II.3.1Token Bucket
      • II.3.2Leaky Bucket
      • II.3.3Queue management
      • II.3.4Scheduling
        • II.3.4.1Scheduling policies
        • II.3.4.1.1GPS
    • II.4Parekh-Gallager Theorem
    • II.5QoS Architectures
      • II.5.1Integrated Services (IntServ)
        • II.5.1.1RSVP
        • II.5.1.2IntServ today
      • II.5.2Differentiated Services (DiffServ)
        • II.5.2.1PHB: Expedited Forwarding
        • II.5.2.2PHB: Assured Forwarding
    • II.6QoS in Fast Interconnect
      • II.6.1Flow Control
        • II.6.1.1Flow Control in IBA
        • II.6.1.2Flow Control in ASI
        • II.6.1.3Flow Control in Ethernet
      • II.6.2Congestion control
        • II.6.2.1Congestion Control in IBA
        • II.6.2.2Congestion Control in ASI
  • Capitolo III - Inter-domain routing with BGP
    • III.1Intra-Domain Routing
      • III.1.1Distance Vector
      • III.1.2Link State
    • III.2Inter-domain routing
      • III.2.1Border Gateway Protocol (BGP)
        • III.2.1.1BGP Messages
        • III.2.1.2BGP Example 1
        • III.2.1.3Route preference
        • III.2.1.4The internet organization
        • III.2.1.5BGP in large networks
        • III.2.1.6Confederations
        • III.2.1.7Route Reflectors
        • III.2.1.8The dynamics of BGP
        • III.2.1.9BGP routing tables
        • III.2.1.10The route selection process
  • Capitolo IV - Asynchronous transfer mode
    • ATM architecture
    • ATM Protocol Stack
    • ATM Addressing
    • ATM Quality of Service
    • ATM Adaptation Layer
    • Call and Connection Control
    • ATM in LAN
    • IP over ATM
  • Capitolo V - Multi Protocol Label Switching
    • MPLS
  • Capitolo VI - Traffic Engineering
    • IP-based Traffic Engineering
    • MPLS-based traffic engineering
  • Capitolo VII - SDH/SONET
  • Capitolo VIII - IP su reti ottiche
    • DWDM
    • Generalized Framing Procedure (GFP)
    • Gigabit Ethernet (GbE)
    • IP-centric control of optical networks
  • Capitolo IX - Network Management
    • Simple Network Management Protocol (SNMP)
    • Network management applications
    • Professional and Business Challanges
    • Service life-cycle
    • Provisioning level Agreement
  • Capitolo X - Network Resiliency
    • Network recovery
    • Recovery Mechanisms Control
  • Capitolo XI - Network security
    • Types of Attack
    • Firewall
    • NAT
    • Intrusion Prevention Systems
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