With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cseNetflowLSFilterDataSource
CISCO SWITCH ENGINE Netflow LS Filter Data Source
1.3.6.1.4.1.9.9.97.1.3.12.1.2
The source network address used as a filter for selecting the flows to which the netflow LAN switching data export feature is applied. If cseNetflowLSNDEFilterDataSource contains all zeros, then the cseNetflowLSNDEFilterDataSource object will not be included in the filtering criterion.
Back to CISCO-SWITCH-ENGINE-MIB MIB page.
IPHost Network monitor allows you to monitor cseNetflowLSFilterDataSource 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.