Overview
Most Opmantek commercial products are licensed by the total number of devices under management. However, both opFlow and opFlowSP use interface licensing; that is how many interfaces does our system see which have NetFlow data.
Examples
A Branch router with 4 interfaces, 1 WAN, and 3 LAN ports, NetFlow export is enabled only on the WAN port, but there is traffic from each of the 3 LAN ports going out the WAN port (typical branch scenario), this would use 4 interface licenses as we are seeing traffic from 4 interfaces.
Likewise if a large Data Center switch had 100 ports and NetFlow export was enabled on 2 interfaces, it is completely conceivable that we would only see data for 10 or 20 interfaces, only the interfaces which have traffic which enters or exits on the two NetFlow export enabled ports.