With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
bsnImpersonatingSourceMacAddr
bsn Impersonating Source Mac Address
1.3.6.1.4.1.14179.2.6.2.74
This is the source mac address which is impersonating the AP.
Back to AIRESPACE-WIRELESS-MIB MIB page.
IPHost Network monitor allows you to monitor bsnImpersonatingSourceMacAddr 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.