ONT Notes – AutoQoS

  • AutoQoS benefits
    • Automates QoS for most deployments
    • Protects business-critical apps to maximize availability
    • Simplifies QoS deployments
    • Reduces configuration errors
    • Cheaper, faster, and simpler deployments
    • Follows DiffServ
    • Allows complete control over QoS configs
    • Allows modification of auto-generated configs
  • AutoQoS phases of evolution
    • AutoQoS VOIP – Early version that configures the basics without discovery
    • AutoQoS for Enterprise – Second version that only runs on routers and uses two-step process
      • Autodiscovery using NBAR
      • Generation of class maps
  • AutoQoS key elements
    • Application classification
    • Policy generation
    • Configuration
    • Monitoring and reporting
    • Consistency
  • Interfaces that you can configure AutoQoS on
    • Serial ifs with PPP and HDLC
    • FR point-to-point subifs (NOT multipoint)
    • ATM point-to-point subifs
    • FR-to-ATM links
  • Prerequsites
    • No Qos policy already configured on if
    • CEF enabled on if
    • Correct bandwidth configured on if
    • IP address on low-speed if
  • Configuring AutoQoS Enterprise on a router (NOT a switch)
    • auto qos discovery – begins discovery process
    • auto qos – generates and applies MQC-based policies
  • Configuring AutoQoS VOIP
    • auto qos voip [ trust | cisco-phone ]
  • Verifying AutoQoS on router
    • show auto discovery qos – get autodiscovery results
    • show auto qos – examine configuration generated
      • Number of classes
      • Classification options
      • Marking options
      • Queuing mechanisms
      • Other QoS mechanisms
      • If, subif, PVC where policy is applied
    • show policy-map interface – look at if stats
  • Verify AutoQoS VOIP
    • show auto qos
    • show policy-map interface
    • show mls qos maps – shows CoS to DSCP mappings
  • Possible issues with AutoQoS
    • Too many traffic classes – manually consolidate some
    • Configuration doesn’t change – rerun AutoQoS
    • Configuration may not fit your situation – fine-tune it by hand
  • Fine-tuning AutoQoS
    • Use QPM
    • CLI
    • copy policy into editor, change, reapply
  • AutoQoS can match on characteristics besides ACLs and NBAR
    • match input interface
    • match cos
    • match ip precedence
    • match ip dscp
    • match ip rtp

Aaron Conaway

I shake my head around sometimes and see what falls out. That's what lands on these pages. If you have any questions, the best way to contact me is through Twitter at @aconaway.

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