We have Lenovo (IBM) RackSwitch G8124E but we are not able to monitor this device. 

(It is not on the list of devices in OpManager)

https://lenovopress.com/tips1271-lenovo-rackswitch-g8124e

RackSwitch G8124E that support Networking OS up to version 7.x

Part number: 7309BR6

Networking OS 7.11.5

Manageability: Simple Network Management Protocol (SNMP V1, V2 and V3)

ManageEngine OpManage Enterprise 11.6