Version 5.4.6-2.x has enhanced the thermal shutdown performance of IE300 and IE200 Series switches. Previously, the switch raised an alarm when it neared a critical temperature and then powered off when the critical temperature was exceeded.
With this enhancement, the switch has a multi-phase response as the temperature increases above a series of thresholds:
- When the temperature exceeds the first threshold, the switch raises an alarm;
- When the temperature exceeds the second threshold, the switch shuts down noncritical POE services;
- When the temperature exceeds the third threshold, the switch shuts down critical POE services; and finally
- When the temperature exceeds the fourth threshold, the switch powers off.
By shutting down some or all PoE services, the switch may stop the temperature increase and be able to keep operating otherwise.
Two new SNMP traps have been created in the atEnvMon MIB, to enable communication of the new thresholds:
The new trap "atEnvMonv2TempCriticalLevel1" fires when the switch reaches the first phase of services shutdown. On IE200 and IE300 switches, non-critical POE ports stop delivering power at this point.
The new trap "atEnvMonv2TempCriticalLevel2" fires when the switch reaches the second phase of services shutdown. On IE200 and IE300 switches, all POE ports stop delivering power at this point.
When the temperature drops to its operational range, the switch powers back up, restores shut-down services, and clears the alarms and traps.