Debugging and Diagnostics | 655
Figure 39-6. show environment Command Example
Recognize an Under-Voltage Condition
If the system detects an under-voltage condition, it sends an alarm. To recognize this condition, look for the
system messages in Message 2.
Message 2 indicates that the specified card is not receiving enough power. In response, the system first
shuts down Power over Ethernet (PoE).
Troubleshoot an Under-Voltage Condition
To troubleshoot an under-voltage condition, check that the correct number of power supplies are installed
and their Status light emitting diodes (LEDs) are lit.
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 2 Under-Voltage Condition System Messages
%CHMGR-1-CARD_SHUTDOWN: Major alarm: Line card 2 down - auto-shutdown due to under voltage
FTOS#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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