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When viewing the NTA Summary Page, you may notice that certain Netflow-enabled devices in the Netflow Sources resource do not show any transmit/receive utilization despite showing traffic reported by Netflow.
All NTA versions
As seen below in the red square, the transmit/receive columns may show 0% utilization.
Alternatively, you may notice that the Traffic In/Traffic Out columns show either 0.0bps or are completely blank.
This is an indication that there is an issue with SNMP polling.
While NTA uses Netflow to report on throughput and conversation information, the bandwidth percent utilization is still polled via SNMP as part of NPM.