Cisco Catalyst 2955T-12 Руководство по устранению неполадок - Страница 5
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Troubleshooting
Table 5-1
Common Problems and Solutions (continued)
Symptom
No connectivity.
Unreadable characters on
the management console.
System LED (Uplink port
status 13 LED) is amber,
and all port LEDs are off.
System LED (Uplink port
13 LED) is amber.
78-14944-03
Possible Cause
Incorrect or bad cable.
No link at both ends.
•
A crossover cable was used
when a straight-through was
required, or vice-versa.
•
The cable is wired incorrectly.
•
STP checking for possible
loops.
Incorrect baud rate.
Corrupted software.
Fatal POST error detected.
•
Resolution
•
For the correct pinouts and
the proper application of
crossover vs.
straight-through cables, see
the
"Cable and Adapter
Specifications" section on
page
•
Replace it with a tested
good cable.
•
Wait 30 seconds for port
status LED to turn green.
Reset the terminal-emulation
software to 9600 baud.
Attach a monitor to the serial
port to display the switch boot
loader. For more information,
see the switch software
configuration guide.
Contact Cisco Systems.
•
Catalyst 2955 Hardware Installation Guide
Diagnosing Problems
B-5.
5-5