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ONT

ONT - Pre-Classify and deploying End-to-End QoS

VPN ..etc. (ok)

  • Pre-classify permet de classer le traffic avant de l’envoyer au travers d’un VPN.
    • qos pre-classify | commande à appliquer à l'interface de sortie + la crypto-map
    • To classify on pre-tunnel header, apply the policy to the tunnel interface WITHOUT pre-classify.
    • To classify on post-tunnel header, apply the policy to the physical interface WITHOUT pre-classify.
    • To classify on pre-tunnel header, apply the policy to the physical interface WITH pre-classify.
  • SLA – contrat avec le SP  pour garantir les méchanismes de QoS au travers du réseau, en se basant sur VOS marquages.
    • Assures availability, loss, throughput, delay, and jitter.
  • End-to-end QoS
    • Pour fonctionner, chaque saut doit avoir la même configuration QoS.
    • QoS mechanism nécessaires à 3 endroits:
      • Campus – Réseau du client
      • Edge devices - CE/PE
      • Réseau du service provider

      QoS Tasks

      Campus access switches Campus distribution WAN edge Provider cloud
      Speed/duplex settings Classification SLA DEfinitions Capacity planning
      Classification Multiple queues Classification DiffServ
      Phone & access switch config Priority queuing for VoIP LLQ LLQ
      Multiple queues on switch ports WRED Link fragmentation Modified deficit RR
      Priority queuing - WRED WRED
      • Enterprise campus QoS implementation
        • Implement multiple queues to avoid congestion
        • Assign VOIP and video to highest priority queue
        • Esablish trust boundaries
        • Use policing to rate-limit excess traffic
        • Use hardware QoS when possible
      • Control Plane Policing (CoPP)
        • Applique les règles de QoS au trafic destiné au routeur
          • Routing protocols
          • Management protocols
        • Peut éviter les attaques DOS

        CoPP Configuration

        • Step 1 - Definir le critère de classification de paquet
        • Step 2 - Definir service policy
        • Step 3 - Enter the control plane en config globale
        • Step 4 - Apply a QoS policy
        Step 1
        class-map telnet-class
         match access-group 100
        
        Step 2
        policy-map telnet-policy
         class telnet
         police 80000 conform transmit exceed drio
        
        Step 3 & 4
        control-plane
         service-policy input telnet-policy

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Networklife is the technical blog of a student in computer engineering at SUPINFO. Working as a trainee for a french network integrator. CCNP Certified, Interested in Networking industry, Routing&Switching, Design, Security.. More about Networklife at http://www.networklife.net/a-propos/ and you can follow him on Twitter.

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