Jitter Summary
Monitoring > Tunnel Health > Jitter
To display the summary view of the Jitter tab, click the summary icon.
This view shows the tunnels that have the most jitter. Statistics are summarized for the selected time period. Jitter can be caused by congestion in the LAN, firewall routers, bottleneck access links, load sharing, route flapping, routing table updates, and timing drifts.

For jitter trend interpretation guidelines, see Jitter Trends
For more details about all tunnel monitoring statistics, see Tunnel Summary