Administrator Guide

Recognize an Over-Temperature Condition
An overtemperature condition occurs, for one of two reasons: the card genuinely is too hot or a sensor has malfunctioned.
Inspect cards adjacent to the one reporting the condition to discover the cause.
• If directly adjacent cards are not normal temperature, suspect a genuine overheating condition.
• If directly adjacent cards are normal temperature, suspect a faulty sensor.
When the system detects a genuine over-temperature condition, it powers o the card. To recognize this condition, look for the
following system messages:
CHMGR-2-MAJOR_TEMP: Major alarm: chassis temperature high (temperature reaches or exceeds
threshold of
[value]C)
CHMGR-2-TEMP_SHUTDOWN_WARN: WARNING! temperature is [value]C; approaching shutdown
threshold of [value]C
To view the programmed alarm thresholds levels, including the shutdown value, use the show alarms threshold command.
Example of the show alarms threshold Command
Dell#show alarms threshold
-- Temperature Limits (deg C) --
---------------------------------------------------------------------------
BelowNormal Normal Elevated Critical Trip/Shutdown
Unit0 <=40 41 71 81 86
Dell#
Troubleshoot an Over-Temperature Condition
To troubleshoot an over-temperature condition, use the following information.
1. Use the show environment commands to monitor the temperature levels.
2. Check air ow through the system. Ensure that the air ducts are clean and that all fans are working correctly.
3. After the software has determined that the temperature levels are within normal limits, you can re-power the card safely. To
bring back the line card online, use the power-on command in EXEC mode.
In addition, Dell Networking requires that you install blanks in all slots without a line card to control airow for adequate system
cooling.
NOTE: Exercise care when removing a card; if it has exceeded the major or shutdown thresholds, the card could be hot
to the touch.
Example of the show enivornment Command
Dell#show environment
-- Unit Environment Status --
Unit Status Temp Voltage
----------------------------
* 0 online 71C ok
* Management Unit
-- Thermal Sensor Readings (deg C) --
Unit Sensor0 Sensor1 Sensor2 Sensor3 Sensor4 Sensor5 Sensor6 Sensor7 Sensor8 Sensor9
------------------------------------------------------------------------------------------
0 45 43 66 61 66 62 70 65 67 71
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Debugging and Diagnostics