With IPHost Network Monitor you can run simple snmp requests against a IBM device in your network.
pppMPPEInDestroyed
ppp MPPE In Destroyed
1.3.6.1.4.1.2.6.119.4.2.13.1.4
Total number of MPPE requests received over the PPP interface that were discarded.
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IPHost Network monitor allows you to monitor pppMPPEInDestroyed 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.