By default, PingPlotter tracks all route changes.  Sometimes, these changes might be normal and might add confusion (ie: too much data) rather than clarity.  PingPlotter supports "masking", or excluding certain changes.
 

Route Change Exclusion Masks 

Route change masks can be manually added.  Alternately (and much easier) is to add a mask by right-clicking on the oscillating router that you’d like to stop signaling a route change.

Show route change indicator when list hidden 

When the route change list is hidden, the normal behavior is to show an indicator there when the route changes.  If you don’t want to know about route changes, you can turn off this option.