With IPHost Network Monitor you can run simple snmp requests against a IBM device in your network.
ibmMvsTcpConnLogMode
ibm Mvs Tcp Connection Log Mode
When the corresponding TCP connection is for a 3172 Telnet session then this object contains the LOG Mode.
Back to ibm_mainframe-Mvstcpip MIB page.
IPHost Network monitor allows you to monitor ibmMvsTcpConnLogMode on IBM device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring IBM switches right now.