With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cnfTopFlowsIndex
cnf Top Flows Index
1.3.6.1.4.1.9.9.387.1.7.8.1.1
Index to select top flows. A value of 1 selects the topmost flow.
Back to CISCO-NETFLOW-MIB MIB page.
IPHost Network monitor allows you to monitor cnfTopFlowsIndex on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco routers right now.