With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
cswRingRedundant
csw Ring Redundant
1.3.6.1.4.1.9.9.500.1.1.3
A value of 'true' is returned when the stackports are connected in such a way that it forms a redundant ring.
Back to CISCO-STACKWISE-MIB MIB page.
IPHost Network monitor allows you to monitor cswRingRedundant 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.