With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
llcSapStatsRetransmitsOut
llc Sap Stats Retransmits Out
1.3.6.1.4.1.9.10.8.1.2.3.1.9
This object reflects the total number of I-Frames retransmitted by all local connection components on this SAP. 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 llcSapStatsRetransmitsOut 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.