With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cftIfTcpRxDupOnlyPkts
Cisco Fiber Channel Tunnel If Tcp Rx Dup Only Packets
1.3.6.1.4.1.9.9.9999.1.1.5.1.20
Number of duplicated TCP packets received.
Back to CISCO-FC-TUNNEL-MIB MIB page.
IPHost Network monitor allows you to monitor cftIfTcpRxDupOnlyPkts on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.