With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
dmFcIdsGranted
Cisco Domain Management Fibre Channel Ids Granted
1.3.6.1.4.1.9.9.302.1.1.1.1.12
The total number of FC IDs that are granted (for local use) by the Domain Manager on the local switch since the switch has been initialized. Note that all such FC IDs have the local switch's Domain ID.
Back to CISCO-DM-MIB MIB page.
IPHost Network monitor allows you to monitor dmFcIdsGranted 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.