View impacted VPN clusters to understand what links are
experiencing performance issues.
Understanding what is causing degraded link
performance is integral for ensuring the user experience when using
apps and services is not impacted. Understanding why your VPN clusters
have links that are impacted helps in fine tuning your SD-WAN configuration
to ensure that the user experiences when using apps and services
are not affected by links with degraded health.
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. In this example,
we are viewing ethernet 1/1 and can see that the percentage of packets
lost regularly exceeded the configured threshold in the Path Quality
Profile for the app and can conclude that this is the reason the
app traffic failed over to the next best link.
select another link to view the Link Characteristics. In this example, we
are viewing ethernet 1/4 and can see that after the app traffic
failed over, ethernet 1/4 experienced jitter for the app that exceeded
the configured threshold. This forced the app traffic to fail over
back to ethernet 1/1.
Since both links had health metrics that were exceeded,
the app traffic had no healthy link to fail over to resulting in
the VPN cluster becoming impacted.
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.