With IPHost Network Monitor you can run simple snmp requests against a IBM device in your network.
rlanActiveIpUserPrevState
rlan Active Ip User Prev State
1.3.6.1.4.1.2.6.119.4.5.1.3.1.2
Back to ibm-ibmrlan MIB page.
IPHost Network monitor allows you to monitor rlanActiveIpUserPrevState 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.