Troubleshoot App Performance

View impacted VPN clusters to understand what apps are experiencing performance issues.
Understanding what is causing degraded performance for your apps and services is integral to ensuring the user experience is not impacted. Understanding why your VPN clusters are impacted and app traffic failed over to different links helps in fine tuning your SD-WAN configuration.
  1. Select
    and view the
    VPN clusters.
  2. Filter the VPN clusters based on your preferred metric from the
    drop-down and select time frame. In this example, we are viewing
    All Sites
    containing impacted VPN clusters in the last 12 hours.
  3. In the Sites column, select the impacted hub or branch firewall to view the impacted apps and the corresponding link performance.
  4. In the App Performance section, click an app to view detailed Traffic Characteristic information about the app traffic such as the internet service(s) and links used:
    • Review the pie chart to understand the breakdown of app traffic across the your internet services.
    • Review the linegraph to understand how many bytes of data were transferred over each internet service over time.
    • Review the Links Used section to understand which links the app traffic used and to understand how many of the bytes were impacted out of the total bytes in the selected time frame.
  5. Investigate which health metric caused the app to swap links.
    The dotted line indicates the seven day average for the health metric.
    1. In the Links Used section of the Traffic Characteristics tab, click an ethernet Link to view detailed Link Characteristics (latency, jitter, and packet loss) over the time frame specified in Step 2 to investigate what health metric caused the app to swap links.
    2. In the
      Traffic Characteristics
      tab, select another link to view the Link Characteristics for secondary app link to better understand what caused the VPN cluster to become impacted.
  6. After you have identified why the app traffic is impacted, consider the following to resolve the issue:
    • Consider adding additional links to the Traffic Distribution Profile. By adding additional links for app traffic to fail over to, you help ensure that the app traffic and user experience are not impacted by links with degraded health.
    • Reconfigure the health thresholds in your Path Quality Profile. It may be that the health thresholds are too strict, resulting in unnecessary link fail over. For example, if you have an app that can experience up to 18% packet loss before user experience is impacted, having a 10% packet loss threshold would result in the app failing over to a different link without a need to.
    • Consult your internet service providor (ISP) to determine if there are impacts to your network outside of your control that they can resolve.

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