With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
fcmPortClass2TxPrjtFrames
fcm Port Class2 Tx Prjt Frames
1.3.6.1.2.1.10.56.1.4.1.15
The number of times that P_RJT was generated by this port as a result of a Class 2 frame being rejected at the destination N_Port. Note that this counter will never increment for an F_Port.
Back to FC-MGMT-MIB MIB page.
IPHost Network monitor allows you to monitor fcmPortClass2TxPrjtFrames 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.