Brocade MLX Series and Brocade NetIron XMR Hardware ...

7Managing the cooling system• If the temperature of a management module, switch fabric module, or one interface moduleexceeds the high threshold specified for a fan speed, the fan changes to the next higher speed.If the temperature of any of the modules exceeds the high threshold for the high speed, therouter shuts down the modules to prevent damage. The router also sends a warning messageto the system log and an SNMP trap. For information about viewing the warning messages,refer to “Displaying temperature warnings” on page 337.• The frequency with which the temperature is checked is determined by the setting of thetemp-poll-period command. For information about temp-poll-period command, refer to“Changing the temperature polling interval” on page 336.• If the temperature of a management module, switch fabric module, and interface modulesfalls below the low threshold for a fan speed, the fan changes to the next lower speed. If thetemperature of all modules falls below the high threshold for the low speed, the fan operatesat the low speed.Table 48 describes the default temperature thresholds for Brocade MLXe devices.TABLE 48Default temperature thresholds for modules and fan speeds for Brocade MLXe devicesFan speed Low temperature threshold High temperature thresholdManagement modulesHigh 77 C 85CMedium-high 67C 80CMedium 57C 70CLow –1 60CInterface modulesHigh 56 C 95CMedium-high 51C 60CMedium 46 C 55 CLow –1 50CSwitch fabric moduleHigh 72 C 85 CMedium-high 67 C 80CMedium 57C 70CLow –1 60 C332 Brocade MLX Series and Brocade NetIron XMR Hardware Installation Guide53-1002373-02