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Why is RX Power Sensor high warning logged repeatedly for a single interface despite "show ports transceiver information detail" showing multiple interfaces with Rx Power above the High Warn Threshold?

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TitleWhy is RX Power Sensor high warning logged repeatedly for a single interface despite "show ports transceiver information detail" showing multiple interfaces with Rx Power above the High Warn Threshold?
Question
Why is RX Power Sensor high warning logged repeatedly for a single interface despite "show ports transceiver information detail" showing multiple interfaces with Rx Power above the High Warn Threshold?

For example:
06/21/2020 14:35:16.01 <Noti:DM.SensorAlarmDtect> Port 1:43 RX Power Sensor=high warning Value= 5.62 mW.
06/21/2020 14:15:16.03 <Noti:DM.SensorAlarmDtect> Port 1:43 RX Power Sensor=high warning Value= 5.62 mW.
06/21/2020 13:20:16.02 <Noti:DM.SensorAlarmDtect> Port 1:43 RX Power Sensor=high warning Value= 5.61 mW.
06/21/2020 13:10:16.04 <Noti:DM.SensorAlarmDtect> Port 1:43 RX Power Sensor=high warning Value= 5.62 mW.
06/21/2020 12:05:16.06 <Noti:DM.SensorAlarmDtect> Port 1:43 RX Power Sensor=high warning Value= 5.61 mW.
06/21/2020 11:40:16.04 <Noti:DM.SensorAlarmDtect> Port 1:43 RX Power Sensor=high warning Value= 5.62 mW.
06/21/2020 11:25:16.05 <Noti:DM.SensorAlarmDtect> Port 1:43 RX Power Sensor=high warning Value= 5.61 mW.

 
Environment
  • Summit X670-G2-48x-4q
  • EXOS 22.5.1.7-patch5-1
Answer
If you examine the output of "show ports transceiver information detail" carefully, you'll see that only the interface for which RX Power Sensor high warning is repeatedly logged has an RX Power that is close to the high warn threshold. Interfaces that are not logged have RX Power that is either far above or far below the high threshold. It is perfectly normal for RX Power to fluctuate slightly. When these fluctuations cause the value of Rx Power to repeatedly exceed and drop under the high warning threshold, RX Power high warning will be repeatedly logged for that interface.

The repeated messages themselves are not a problem, but if the RX Power for an interface exceeds the high warning value at all, an attenuator that keeps the RX Power under the high warning value should be deployed.
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