With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
fcIfCurrTxBbCredit
Cisco Fibre Element If Current Tx Buffer-to-Buffer Credit
1.3.6.1.4.1.9.9.289.1.2.5.1.2
The current value of transmit buffer-to-buffer credits for this port.
Back to CISCO-FC-FE-MIB MIB page.
IPHost Network monitor allows you to monitor fcIfCurrTxBbCredit 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.