Some explanation:
IMC is polling the device typically every 4 hours (configurable).
It then compares the difference between the port Administration status and the port Operational status.
If the port is set UP by the administrator, and IMC found it DOWN, it fires an alarm.
To get rid of them, you can filter them out in the "SystemSetting" (see attached picture).
You can also set the Admin status DOWN for every intrface you are NOT using.
Beware: These traps are generating by IMC during the device polling process.
It should not be confused with MIB-II LinkUp/LinkDown traps generated by the device SNMP agent itself, but usually you can filter these at the device level.
BR
Ray