With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
fcmSwitchPrincipal
fcm Switch Principal
1.3.6.1.2.1.10.56.1.2.1.3
An indication of whether this switch is the principal switch within its fabric.
Back to FC-MGMT-MIB MIB page.
IPHost Network monitor allows you to monitor fcmSwitchPrincipal 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.
