Cisco Systems OL-6157-01 manual No connectivity to SFP, Switch placed in, module is inserted

Chapter 3 Troubleshooting

Diagnosing Common Problems

Table 3-1 Common Connectivity Problems and Their Solutions (continued)

Symptom	Possible Cause	Resolution
No connectivity to SFP	• The SFP module was	• Remove and reinstall the
module.	installed after the switch	SFP module, and reboot the
	was powered on.	switch.
	Note By default, the	Note See the “Connecting to
	100BASE-FX port is	an SFP Module” section
	enabled and the SFP	on page 2-12and the
	module slot is disabled if	Cisco Small
	an SFP module is not	Form-Factor Pluggable
	already installed when	Modules Installation
	the switch is powered on.	Notes (order number
		DOC-7815160=) for
		procedures on removing
		an SFP module.
	• A 100BASE-FX device is	• Remove the connection to
	connected to the switch.	the 100BASE-FX device,
		reinstall the SFP module,
		and reboot the switch.
Switch placed in	Bad or non-Cisco-approved SFP	Remove SFP module from the
error-disabled state after SFP	module.	switch, and replace it with a
module is inserted.		Cisco-approved module. Use the
		errdisable recovery cause
		gbic-invalid global
		configuration command to verify
		port status, and enter a time
		interval to recover from the
		error-disable state.
		See the command reference for
		information about the errdisable
		recovery command.

Catalyst 2940 Switch Hardware Installation Guide

OL-6157-01 3-3