S-Series Debugging and Diagnostics | 361
To view the programmed alarm thresholds levels, including the shutdown value, execute the show alarms
threshold
command shown in Figure 14-7.
Figure 14-7. show alarms threshold Command Example
Troubleshoot an over-temperature condition
To troubleshoot an over-temperature condition:
1. Use the
show environment commands to monitor the temperature levels.
2. Check air flow through the system. On the C-Series, air flows sideways from right to left. Ensure the
air ducts are clean and that all fans are working correctly.
3. Once the software has determined that the temperature levels are within normal limits, the card can be
re-powered safely. Use the
power-on command in EXEC mode to bring the line card back online.
In addition, Dell Force10 requires that you install blanks in all slots without a line card to control airflow
for adequate system cooling.
Recognize an under-voltage condition
If the system detects an under-voltage condition and declares an alarm. To recognize this condition, look
for the system messages in Message 4.
This message in Message 4 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 RPMs.
Note: Exercise care when removing a card; if it has exceeded the major or shutdown thresholds, the card
could be hot to the touch!
Message 4 Under-voltage Condition System Messages
%CHMGR-1-CARD_SHUTDOWN: Major alarm: Line card 2 down - auto-shutdown due to under voltage
FTOS#show alarms threshold
-- Temperature Limits (deg C) --
---------------------------------------------------------------
Minor Minor Off Major Major Off Shutdown
Linecard 75 70 80 77 85
RPM 65 60 75 70 80
FTOS#
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