50 CHAPTER 4: PROBLEM SOLVING
A fan failure warning message is received
Your Switch has a fan monitoring system that will generate fan failure
warning messages. Fan failure could potentially reduce the lifetime of the
Switch. The monitoring system polls the fan status at periodic intervals
while the unit is powered up.
Should one or more fans fail within the Switch, a warning message will
be generated in the following ways:
■ RMON Trap — if configured, an RMON trap is generated and sent to
the management workstation.
■ Command Line Interface — an indication of a general hardware
failure is provided through the Top level menu displayed when logging
on to the CLI. For more detailed information about the failure select
the system summary command.
■ Web interface — an indication of fan failure is provided through the
Device Summary table for the specific unit. In addition all Summary
tables turn red to indicate the fan failure. The device mimic will also
display red flashing fan icons.
For further information about RMON, refer to “Chapter 7: Status
Monitoring and Statistics” in the Switch Implementation Guide supplied
in PDF format on the CD-ROM that accompanies the Switch.
If a fan failure warning message is generated:
1 Power off the unit.
2 Check that the air vents are not obstructed.
3 Power cycle the unit. To do this, remove and reconnect the AC mains
supply.
4 If a fan fail trap is still received, return the unit.
Unit fails or SNMP thermal shutdown trap is received
1 Power cycle the unit. To do this, remove and reconnect the AC mains
supply.
2 Check the command line interface (system summary command) to
determine whether a thermal shutdown has occurred.
3 If no, return the unit:
If yes, check that:
■ The air vents are not obstructed.
DUA1745-0AAA02.book Page 50 Monday, August 9, 2004 11:51 AM
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