Cisco Catalyst 3560, Hardware Installation Manual

Page: 102 / 168

Chapter 4 Troubleshooting
Diagnosing Problems
4-6
Catalyst 3560 Switch Hardware Installation Guide
78-16057-01
Unreadable characters on the
management console Incorrect baud rate. Reset the emulation software to
9600 baud.
Amber system LED Fatal POST error detected. Contact Cisco Systems.
The switch port is placed in
error-disabled state after SFP is
inserted Bad or non-Cisco-approved SFP. Remove the SFP module from
the switch, and replace it with a
Cisco-approved module. Use the
errdisable recovery cause
gbic-invalid
global
configuration command to
verify the port status, and enter a
time interval to recover from the
error-disable state.
Refer to the switch command
reference guide for information
on the
errdisable recovery
command.
Switch does not recognize the
SFP module The SFP module might be installed
upside down.
The SFP module does not snap into
the slot.
Verify that the SFP module is
not installed upside down.
Remove the SFP module.
Inspect for physical damage to
the connector, the module, and
the module slot.
Replace the SFP module with a
known good SFP module.
Powered device connected to
PoE port, but no power given
Switch might not have enough power
capacity to deliver PoE to a new
powered device. Use the Mode button to show the
PoE status for all ports.
If the port status LED is
alternating green and amber,
connect the powered device to
an external AC power source.
Table 4-1 Common Problems and Their Solutions (continued)
Symptom Possible Cause Resolution