We have a user who is looking for solid documentation on how certain devices are discovered and when. For example, we're currently exporting NetFlow data from hundreds of routers to NFA, and those devices then appear in NetOps. It looks like they're eventually discovered and polled via SNMP by NetOps automatically as well. When does that happen? And what happens to that device in NetOps if the data is no longer exported to NFA?
Release : 20.2
Component : APM Agents
The way this works are when NFA added as a data source the NFA elements/devices are synced over to the NetOps portal. If SNMP polled (Data Aggregator) items are also created they to are synced over to the NetOps portal and consolidated with any corresponding element/device from any data source that contributed it. You will only see the one element/device in the GIU and Reports. Now for your questions:
It looks like they're eventually discovered and polled via SNMP by NetOps automatically as well. When does that happen?
When adding a data source there is an option check box "Contribute inventory to Data Aggregator" if this is checked the devices will be added to the Data Aggregator for SNMP polling. They are brought over during the initial add of the data source and discovered with SNMP. This will also occur when new devices are added to NFA and sync'd over during the normal sync cycle.
What happens to that device in NetOps if the data is no longer exported to NFA?
If the device is removed from NFA the NFA related element/device will be removed but the Data Aggregator element will remain and providing SNMP data.