I created a test environment to simulate his problem , and I found when the IN traffic was over the interface bandwidth we set, it shows IN traffic is zero. see the attachments graph1.jpg.

      In graph1.jpg ...

      tx/rx interface bandwidth are both set to 100bps.( for testing)

      I generated traffic using snmpbulkwalk to generate an unbalanced traffic pattern.

      It shows that the IN traffic is zero (which can't be zero), and the TX traffic is not zero.

I also found that if tx/rx are both higher than 100bps , you will find that the traffic graph stop graphing. (This is what our customer said.)

Please confirm this problem, thank you.

I use OpManager build 9200.