With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
tn3270sLuLfsid
tn3270s Lu Lfsid
1.3.6.1.4.1.9.9.54.1.5.1.1.14
This is the session identifier on a PU 2.1 link.
Back to CISCO-TN3270SERVER-MIB MIB page.
IPHost Network monitor allows you to monitor tn3270sLuLfsid 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.
