With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
fcmPortClassFTxFrames
fcm Port Class F Tx Frames
1.3.6.1.2.1.10.56.1.4.1.23
The number of Class F frames transmitted out of this port.
Back to FC-MGMT-MIB MIB page.
IPHost Network monitor allows you to monitor fcmPortClassFTxFrames on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.