When the system detects a genuine over-temperature condition, it powers off 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) --
----------------------------------------------------------------
Minor Off Minor Major Off Major Shutdown
Unit2 55 60 75 80 85
----------------------------------------------------------------
Minor Off Minor Major Off Major Shutdown
Unit3 55 60 75 80 85
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 flow 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, to control airflow for adequate system cooling, Dell Networking requires that you install blanks in
all slots without a line card.
NOTE: Exercise care when removing a card; if it has exceeded the major or shutdown thresholds, the card
could be hot to the touch.
Recognize an Under-Voltage Condition
If the system detects an under-voltage condition, it sends an alarm.
To recognize this condition, look for the following system message: %CHMGR-1-CARD_SHUTDOWN: Major
alarm: stack unit 2 down - auto-shutdown due to under voltage
.
This message indicates that the specified card is not receiving enough power. In response, the system first
shuts down Power over Ethernet (PoE). If the under-voltage condition persists, line cards are shut down, then
the RPMs.
Debugging and Diagnostics 1245
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