Troubleshooting

Use Table 3-1 to identify problems with the modules and take the appropriate corrective action.

Table  3-1: Common Problems and Their Solutions

Symptom	Possible Cause	Corrective Action
Port LED is amber.	Thumbscrews have not been tightened.	Tighten thumbscrews.
	Spanning-Tree Protocol is checking for loops.	Wait for Spanning-Tree Protocol to complete its search. The LED turns green when Spanning-Tree Protocol completes its check.
	Port was disabled by management or an address violation, or it was blocked by Spanning-Tree Protocol.	Use Switch Manager or the command-line interface to check the status of the port and enable it.
Port LED is alternating green-amber.	Port is experiencing error frames. This could be due to a duplex mismatch that was caused by autonegotiation.	Check the duplex and speed settings on both devices. If one parameter is manually set, manually set all of them, or set both devices to autonegotiate speed and duplex. See the Catalyst 2900 Series XL Installation and Configuration Guide for more information.
Port LED is off.	Device has no power.	Ensure that the switch and the target device have power.
	Wrong cable type.	Verify that the cable is correct: crossover or straight-through.
	Bad cable.	Replace with a known good cable.
Expansion slot LED is amber.	Module failed POST.	Call Cisco Systems to replace the module.