Appendix A - Troubleshooting
Refer to the SMxTAT2SA Install Guide for Install Troubleshooting, Warranty, Support, and Compliance
information.
General Troubleshooting Procedure
Many problems are caused by the following situations. Check for these items first when you start
troubleshooting:
1. Verify the install procedures were performed correctly. See the SMxTAT2SA Install Guide.
2. Check if the SMxTAT2SA POWER LED is Off:
• Check connections between the switch, the power cord and the wall outlet.
• Contact your dealer for assistance.
3. Check if the SMxTAT2SA Link LED is Off:
• Verify that the switch and attached device are powered on.
• Be sure the cable is plugged into the switch and corresponding device.
• If the switch is installed in a rack, check the connections to the punch-down block and patch
panel.
• Verify that the proper cable type is used and its length does not exceed specified limits.
• Check the adapter on the attached device and cable connections for possible defects.
Replace the defective adapter or cable if necessary.
4. Make sure all devices connected to the SMxTAT2SA are configured to auto negotiate, or are
configured to connect at half duplex (all hubs are configured this way, for example).
5. Check the cabling:
• Look for faulty or loose cables.
• Look for non-standard and miswired cables.
6. Make sure you have a valid network topology:
• Check for improper Network Topologies.
• Make sure that your network topology contains no data path loops.
7. Check the port configuration.
• Make sure ports have not been put into a “blocking” state by Spanning Tree, GVRP, or LACP.
The normal operation of the Spanning Tree, GVRP, and LACP features may put the port in a
blocking state.
• Verify that the port has not been configured as disabled via software.
8. Make sure connected devices (e.g., SFPs, switches, hubs) are cabled, powered, and operating
properly.
9. If possible, try switching modes (i.e., from Web UI to CLI, or vice versa).
10. Verify the specific function that failed (e.g., port config, PoE or VLAN management, QoS,
Spanning Tree). Refer to the specific function's user manual page and online Help for details.
Verify that the function you are trying to perform is supported by your particular switch model.
11. Run the tests in the Diagnostic tab of the Web UI. Verify that the interface is assigned to the
correct VLAN. Use the Layer 2 traceroute. Check for spanning-tree problems such as BPDU floods
or flapping mac address. Try a ping to broadcast IP address of subnet from your L3 device
(Gateway).
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