With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
stpxSMSTMaxInstanceID
stpx SMST Max Instance ID
1.3.6.1.4.1.9.9.82.1.14.2
The maximum MST instance ID that can be supported by the device for IEEE MST.
Back to CISCO-STP-EXTENSIONS-MIB MIB page.
IPHost Network monitor allows you to monitor stpxSMSTMaxInstanceID 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.