With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cnfPSActive
cnf PS Active
1.3.6.1.4.1.9.9.387.1.5.3.1.5
This is a summation of active time of all flows belonging to the same protocol and port in milliseconds. The time between first switched packet and last switched packet is measured as the active time of a flow.
Back to CISCO-NETFLOW-MIB MIB page.
IPHost Network monitor allows you to monitor cnfPSActive on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.