Monitoring Power and Cooling
If the unit powers off after running for a while, check for loose power connections,
power losses or surges at the power outlet, and use the
show chassis command to verify that the temperature is below the shutdown threshold. If you still
cannot isolate the problem, then the internal power supply may be defective. In this
case, contact
RUCKUS Technical Support for assistance.
The device contains temperature sensors that the software reads based on a configurable device poll time. Switch models with cooling fans have two automatic speed fan control settings based on the temperature. To protect the device from overheating, the following temperature threshold levels exist:
- The warning level is the temperature at which the device generates a syslog message. It is configurable up to 100°C (212°F).
- The shutdown level is the temperature at which the device reboots. It is set by the device and is not configurable. When the device temperature reaches the shutdown level, it generates a warning message that the device’s temperature is over the shutdown level and the device shuts down in two minutes. The system restarts 120 seconds after the device reaches the temperature shutdown level.
For switch models with cooling fans, the fans have two speeds, low and high. The fan speed settings are set by the device and are not configurable. During system bootup, the fans run at high speed. After bootup, the fans operate at low speed when the temperature of the switch is below the high limit temperature that is specified in the following table. If the switch reaches the high limit temperature, the fans operate at high speed until the switch reaches the low limit temperature specified in the table, at which time the fans decrease to low speed. If the switch reaches or exceeds the critical (shutdown) temperature for two minutes, the switch shuts down.
Temperature Thresholds
To display the temperature of a device, enter the
show chassis command at any level of the CLI. The
show chassis command displays the current temperature, the power supply status, and temperature
threshold levels. The displayed temperature reflects the temperature of the board
inside the device.
device# show chassis
The stack unit 1 chassis info:
Power supply 1 (AC - PoE) present, status ok
Model Number: YM-1921AB06R
Serial Number: SA000V171708000081
Firmware Ver: P2H802A00
Power supply 1 Fan Air Flow Direction: Front to Back
Power supply 2 (AC - PoE) present, status ok
Model Number: YM-1921AB06R
Serial Number: SA000V171708000083
Firmware Ver: P2H802A00
Power supply 2 Fan Air Flow Direction: Front to Back
Fan 1 ok, speed (manual): 1<->[[2]]
Fan 2 ok, speed (manual): 1<->[[2]]
Fan controlled temperature:
Rule 1/2 (MGMT THERMAL PLANE): 60.7 deg-C
Rule 2/2 (PoE THERMAL PLANE): 10.0 deg-C
Fan speed switching temperature thresholds:
Rule 1/2 (MGMT THERMAL PLANE):
Speed 1: NM<----->95 deg-C
Speed 2: 85<----->105 deg-C (shutdown)
Rule 2/2 (PoE THERMAL PLANE):
Speed 1: NM<----->41 deg-C
Speed 2: 34<----->105 deg-C (shutdown)
Fan 1 Air Flow Direction: Front to Back
Fan 2 Air Flow Direction: Front to Back
Slot 1 Current Temperature: 61.7 deg-C (Sensor 1), 54.4 deg-C (Sensor 2), 10.0 deg-C (Sensor 3)
Slot 2 Current Temperature: NA
Warning level.......: 102.0 deg-C
Shutdown level......: 105.0 deg-C
Boot Prom MAC : 609c.9fe2.154c
Management MAC: 609c.9fe2.08d6