With IPHost Network Monitor you can run simple snmp requests against a IBM device in your network.
ifOutBroadcastPkts
if Out Broadcast Packets
1.3.6.1.2.1.31.1.1.1.5
The total number of packets that higher-level protocols requested be transmitted, and which were addressed to a broadcast address at this sub-layer, including those that were discarded or not sent.
Back to ibm_mainframe-Ifmib MIB page.
IPHost Network monitor allows you to monitor ifOutBroadcastPkts 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.