With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
portTopNMode
port Top N Mode
1.3.6.1.4.1.9.5.1.20.1.1.4
portTopNForeground (1) means when portTopNTimeRemaining reaches to 0, the report will show on the CLI at once and it won't be kept in the portTopNTable. portTopNBackground (2) means the report will not show on the CLI it will be kept in the portTopNTable. This object may not be modified if the associated portTopNStatus object is equal to active(1).
Back to CISCO-STACK-MIB MIB page.
IPHost Network monitor allows you to monitor portTopNMode on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco mobile switches right now.