With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cipCardCsnaStatsBytesTxByMaxBlockLength
Channel Interface Processor Card Csna Statistics Bytes Tx By Max Block Length
1.3.6.1.4.1.9.9.33.1.1.3.1.14
The number of Bytes Transmitted when the Maximum block length has been exceeded.
Back to CISCO-CIPCSNA-MIB MIB page.
IPHost Network monitor allows you to monitor cipCardCsnaStatsBytesTxByMaxBlockLength on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco optical switches right now.