With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
rpmPortTable
rpm Port Table
1.3.6.1.4.1.351.110.5.2.9.1.1
This table contains information on subinterfaces configured on RPM back plane interface.
Back to CISCO-MGX82XX-RPM-SUBIF-MIB MIB page.
IPHost Network monitor allows you to monitor rpmPortTable on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco multiplexers right now.