Interface data is showing "No Data to Display" in the DX NetOps Performance Management (PM) Performance Center (PC) Portal User Interface (UI).
The Monitored Devices Inventory shows the Device. In it's Polled Metric Families tab the Interface Metric Family has Active Polled Interface items.
Why aren't the Active Polled Interfaces showing data?
The Interface Items, and the Polling Group to represent them, are missing in the devices Polling Configuration. This is observed by taking the following steps.
Interface items are not added to the Data Collectors Polling Configuration. As a result they are not scheduled for polling cycles.
A true root cause for this is yet to be determined. In reported instances of the problem, by the time it's noticed it's too late to determine a cause.
A likely contributing factor is Collection changes where the Collections used have the affected Metric Family applied to the device.
All supported DX NetOps Performance Management releases
There are some things we can try that normally resolve this by forcing a rebuild of the devices polling configuration.
In order of least impact to most impact try the following steps.
If none of the above works, the last remaining option may be to delete and rediscover the device. If this is not desired, open a new Support case for assistance with additional debug. It may reveal a different cause.
If none of the above works, the normal next step is enabling Detailed Poll Logging and Detailed SNMP Logging for the Interface Metric Family to determine what else may be wrong.
Additional information about how to enable and gather that logging can be found in the Knowledge Base Article Enable and download logging from DCDebug in Performance Management.