ONT Notes – Pre-classify and End-to-end QoS

  • VPNs (Didn’t ISCW cover this?)
    • Provide
      • Confidentiality
      • Integrity
      • Authentication
    • Types
      • Remote-access
        • Client-initiated
        • NAS-initiated
      • Site-to-site
        • LAN-to-LAN
        • Extranet
  • L3 Tunneling protocols
    • GRE
    • IPSec
  • Pre-classify allows traffic to be classified before being sent across a tunnel or crypto-ed.
    • qos pre-classify
    • Provides a view into the original IP headers
    • 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 – agreement with provider to guarantee QoS mechanisms across their network based on your markings.
    • Assures availability, loss, throughput, delay, and jitter.
  • End-to-end QoS
    • To be effective, each hop in the path must have QoS configured similarly.
    • Necessary in three locations
      • Campus – within the customer network
      • The edges – customer facing the provider, provider facing customer
      • On the provider network
  • QoS tasks
    • Campus access switches
      • Speed/duplex settings
      • Classification
      • Trust
      • Phone/access switch configs
      • Multiple queues on switch ports, including priority for VOIP
    • Campus distribution
      • L3 policing and marking
      • Multiple queues on switch ports, including priority for VOIP
      • WRED
    • WAN edge
      • SLA definitions
      • LLQ
      • LFI
      • WRED
      • Shaping
    • Provider cloud
      • Capacity planning
      • PHB
      • LLQ
      • 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)
    • Applies QoS policy to traffic destined for the router
      • Routing protocols
      • Management protocols
    • Can be used to avoid DOS attacks
    • Applied to control-plane in global config

Aaron Conaway

I shake my head around sometimes and see what falls out. That's what lands on these pages.

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2 comments for “ONT Notes – Pre-classify and End-to-end QoS

  1. February 4, 2010 at 12:37 pm

    love the new site theme and can’t wait for my ONT studies, you are doing a great job and I’m sure gonna use it!

    Rofi

  2. February 4, 2010 at 9:27 pm

    Thanks, Rofi. Be sure to get your ONT done by July 31st to get credit for it towards your CCNP!

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