5-7
Catalyst 4500 E-Series Switches Installation Guide
OL-13972-01
Chapter 5 Troubleshooting
Troubleshooting Backplane Modules

System Messages and Fan Problems

Look for system messages reporting a temperature problem or pr oblem with the fans. Individual
messages may suggest different solutions. Connect a terminal to the console port, and look for any of
the following system messages:
C4K_CHASSIS-2-INSUFFICIENTFANSDETECTED
C4K_CHASSIS-2-INSUFFICIENTFANSSHUTDOWN
C4K_IOSMODPORTMAN-4-CRITICALTEMP
C4K_IOSMODPORTMAN-4-FANTRAYBAD
C4K_IOSMODPORTMAN-4-FANTRAYPARTIALFAILURE
C4K_IOSMODPORTMAN-4-FANTRAYREMOVED
C4K_SUPERVISOR-3-FANTRAYREADFAILED
C4K_SUPERVISOR-3-FANTRAYSEEPROMREADFAILED
C4K_SUPERVISOR-3-FANTRAYSEEPROMINVALID
C4K_IOSMODPORTMAN-4-TEMPHIGH
C4K_IOSMODPORTMAN-4-TEMPUNDERCRITICAL
C4K_CHASSIS-2-OVERHEATINGSHUTDOWN
If you see any of these messages or other messages related to fans, go to the following location and e nter
the message text to find recommendations for your situation.
http://www.cisco.com/cgi-bin/Support/Errordecoder/index.cgi
Useful CLI Commands
The show environment status fantray command can give additional information useful in diagnosing
fan tray problems.
Troubleshooting Backplane Modules
The Cisco Catalyst 4500 E-series redundancy scheme uses removable redundancy modules (also call ed
mux-buffers), on the passive backplane to switch traffic to the active supervisor engine. There is one
redundancy module per switching module. Redundancy modules and a r edundant clock ship standard
with every Cisco Catalyst 4507R-E and 4510R-E chassis. Spare redundancy modules (WS-X4590-E=)
and a clock module (WS-X4K-CLOCK-E=) are available for serviceability.
The following conditions indicate that you may need to r eplace the redundancy modules and clock
module:
• The switch powers down and stays down for a few minutes to a few days for no clear reason.
• The output-fail LED on the power supplies are red and no power is delivered to the chassis. The
other LEDs on the power supply are green.
• The Status LEDs on the switching modules and the supervisor engine are flashing green.
• CPU Utilization LEDs are flashing green or off.