Comprehensive and Detailed Explanation From Exact Extract:
The most common cause of mismatch between bandwidth (SNMP) numbers and flow (NetFlow, sFlow, etc.) numbers is that not all network traffic is included in the flow export. SNMP bandwidth counters include all traffic traversing the interface, but NetFlow or other flow records may only represent sampled or filtered subsets, or may miss certain traffic due to export or device configuration limitations. This is a well-documented and expected difference in the SolarWinds platform.
[Reference:, , Network Performance Monitor Administrator Guide, “Understanding Bandwidth and Flow Discrepancies,”, , “Flow data]
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