With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cfmPoolInuseFgids
Cisco Fabric Multicast Pool Inuse Fgids
1.3.6.1.4.1.9.9.255.1.2.1.1.5
The current number of FGIDs in this pool that are currently in use by the FGID clients from one or more logical routers.
Back to CISCO-FABRIC-MCAST-MIB MIB page.
IPHost Network monitor allows you to monitor cfmPoolInuseFgids on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco switches right now.