With IPHost Network Monitor you can run simple snmp requests against a IBM device in your network.
ibmVlanIpCutThruToDiscPkts
ibm Vlan Ip Cut Thru To Disc Packets
1.3.6.1.4.1.2.5.8.4.3.3.2.1.4
The number of Broadcast/Multicast packets discarded before it is forwarded because cutThru to this VLAN was disabled.
Back to ibm-ibmlanex MIB page.
IPHost Network monitor allows you to monitor ibmVlanIpCutThruToDiscPkts 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.