With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
fcsRxRegReqs
Cisco Fabric Configuration Server Rx Registration Request
1.3.6.1.4.1.9.9.297.1.2.2.1.3
The number of Registration Requests received by the Fabric Configuration Server on this VSAN.
Back to CISCO-FCS-MIB MIB page.
IPHost Network monitor allows you to monitor fcsRxRegReqs on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco firewalls right now.