With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cfcmPortBBCreditZeros
Fibre Channel Management Port BB Credit Zeros
1.3.6.1.4.1.9.10.999999.1.4.1.1
The number of transitions in/out of the buffer-to-buffer credit zero state. The other side is not providing any credit.
Back to CISCO-FC-MGMT-MIB MIB page.
IPHost Network monitor allows you to monitor cfcmPortBBCreditZeros 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.