With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
fcFxPortC3InOctets
fc Fx Port C3 In Octets
1.3.6.1.2.1.75.1.4.3.1.3
The number of Class 3 frame octets, including the frame delimiters, received by this FxPort from its attached NxPort.
Back to FIBRE-CHANNEL-FE-MIB MIB page.
IPHost Network monitor allows you to monitor fcFxPortC3InOctets 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.