60 CHAPTER 4: PROBLEM SOLVING
Switch. The monitoring system polls the fan status at periodic intervals
while the unit is powered up.
If one or more fans have failed in the Switch, a warning message will be
generated in the following ways:
■ RMON Email Notification — If configured, you will receive
notification of the fan failure via email, SMS (Short Message Service),
or pager.
■ RMON Trap — If configured, an RMON trap is generated and sent to
the management workstation.
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.
■ 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.
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. If the unit has no AC main supply, remove and reconnect the DC
RPS supply.
4 If another fan failure warning message is generated via the Command
Line Interface or the Web interface, return the unit.
Unit fails, no SNMP fan failure message is received
1 Power cycle the unit. To do this, remove and reconnect the AC mains
supply. If the unit has no AC mains supply, remove and reconnect the DC
RPS supply.
2 Check the command line interface (system summary command) to
determine whether a thermal shutdown has occurred.
3 If no, return the unit:
DUA1720-3AAA09.book Page 60 Wednesday, July 6, 2005 4:33 PM
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