With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cfmaApplInuseFgids
Cisco Fabric Multicast application Application Inuse Fgids
1.3.6.1.4.1.9.9.256.1.1.1.1.3
The number of FGIDs that are currently in use by this application.
Back to CISCO-FABRIC-MCAST-APPL-MIB MIB page.
IPHost Network monitor allows you to monitor cfmaApplInuseFgids 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.