With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
fcmFxPortCapDataFieldSizeMin
fcm Fx Port Cap Data Field Size Min
1.3.6.1.2.1.10.56.1.7.1.8
The minimum size in bytes of the Data Field in a frame that this Fx_Port is capable of receiving from an attached Nx_Port.
Back to FC-MGMT-MIB MIB page.
IPHost Network monitor allows you to monitor fcmFxPortCapDataFieldSizeMin 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.