With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
llcSapStatsLocalBusies
llc Sap Stats Local Busies
1.3.6.1.4.1.9.10.8.1.2.3.1.1
This object reflects the total number of times that the local connection components on this SAP have entered a busy state (RNR). This object is initialized to zero when the SAP is created.
Back to CISCO-SNA-LLC-MIB MIB page.
IPHost Network monitor allows you to monitor llcSapStatsLocalBusies 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.