Cisco Catalyst 2970 Hardware Installation Manual page 78

Diagnosing Problems
Table 3-1 Common Problems and Their Solutions (continued)
Symptom
The switch port is placed in
error-disabled state after SFP
module is inserted
Switch does not recognize the
SFP module
Catalyst 2970 Switch Hardware Installation Guide
3-6
Possible Cause
Bad or non-Cisco-approved SFP
module.
The SFP module might be installed
upside down.
The SFP module does not snap into
the slot.
Chapter 3 Troubleshooting
Resolution
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.
See the switch command
reference guide for information
on the errdisable recovery
command.
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.
OL-6422-01