With IPHost Network Monitor you can run simple snmp requests against a Cisco device in your network.
rpmPortSubNetMask
rpm Port Sub Net Mask
1.3.6.1.4.1.351.110.5.2.9.1.1.1.6
The subnet mask configured on the sub-interface.
Back to CISCO-MGX82XX-RPM-SUBIF-MIB MIB page.
IPHost Network monitor allows you to monitor rpmPortSubNetMask on Cisco device via the SNMP protocol. Download IPHost Network Monitor (500 monitors for 30 days, 50 monitors free forever) to start monitoring Cisco optical switches right now.
