With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cLTsmDot11DnlinkLostPackets
Cisco L Tsm Dot11 Dnlink Lost Packets
1.3.6.1.4.1.9.9.525.1.2.3.1.9
This object indicates the number of lost downstream packets in the specified interval.
Back to CISCO-LWAPP-TSM-MIB MIB page.
IPHost Network monitor allows you to monitor cLTsmDot11DnlinkLostPackets on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco wireless switches right now.