With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cfmFlowUdpPortSrc
Cisco Flow Monitor Flow Udp Port Source
1.3.6.1.4.1.9.9.692.1.2.7.1.2
This object indicates the source UDP port number of the corresponding traffic flow.
Back to CISCO-FLOW-MONITOR-MIB MIB page.
IPHost Network monitor allows you to monitor cfmFlowUdpPortSrc 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.