Description
Based on traversability from the starting point or points, no subnetwork controller was found in the subnetwork. For example, the Traversability section may include a condition barrier that is causing the trace to stop before reaching the subnetwork controller.
There is a Trace rule configured to generate the diagram. Among the network elements in input for the diagram generation, there are devices that serve as subnetwork controllers and prevent the Trace rule to execute.
Solution
Review the trace configuration to see if changes are required, and attempt the trace again.
The diagram template related to the generated diagram must be reviewed. A Set Starting Point rule must be configured before the Trace rule to clearly specify the terminal or terminals that are expected as the starting points for the trace execution, and these terminals must be set as subnetwork controllers.