We've installed a trial version of XMC and added 12 units 210-24p switches. The ten switches are working smoothly while two switches are showing "Device Down". We tried to remove and re-add them, the status changed from red to orange. We can manage and ping them but it still shows SNMP Contact Lost and triggering "Device Down" Alarm.
The SNMP configuration on all of the twelve switches are the same so I think there shouldn't be issue knowing the other switches are working fine.