With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cwdsiWnmDropUmdTxMsgCount
cwdsi Wnm Drop Umd Tx Msg Count
1.3.6.1.4.1.9.9.509.1.4.1.1.11
This object specifies the number of dropped messages by WDS because of the Unacknowledged Message Descriptor (UMD) allocation problem before sending the messages to Wireless Network Manger. Discontinuities in the value of this counter can occur at re-initialization of the WDS, and at other times as indicated by the value of cwdsiWnmDiscontinuityTime.
Back to CISCO-WDS-INFO-MIB MIB page.
IPHost Network monitor allows you to monitor cwdsiWnmDropUmdTxMsgCount 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.