With IPHost Network Monitor you can run simple snmp requests against a IBM device in your network.
pppCHAPIfIndex
ppp CHAP If Index
1.3.6.1.4.1.2.6.119.4.2.5.1.1
A unique identifier for a PPP interface running CHAP. This object is the same as the MIB-II ifIndex object.
Back to ibm-ibmiroc MIB page.
IPHost Network monitor allows you to monitor pppCHAPIfIndex 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.