A chassis down alarm may be displayed on a chassis device when the actual device goes down. If it’s a Cisco device, you can disable this functionality:
Change the EnableEntityModuleModeling to False
Reconfigure the device
This will remove the chassis modeling and when the device goes down (but ICMP stays up) you will get an orange (major) “Management Agent Lost Alarm”. If the ICMP is down as well as the SNMP, you will get a red (critical) “Device Has Stopped Responding To Polls” alarm.
Cheers
Jay