Troubleshooting LED Flashing Lights on Your Network Switch

When your network switch's lights start flashing, it can be a frustrating experience, especially if you're not sure what's causing the issue. In this article, we'll explore some common causes of LED flashing lights on your Aruba AOS-CX switch and provide step-by-step troubleshooting tips to help you resolve the problem.

What Causes LED Flashing Lights?

LED flashing lights can be a sign of various issues with your network switch, including unsupported or unrecognized transceivers, port configuration mismatches, self-test or initialization failures, and even failed fan assemblies. To identify the root cause of the issue, it's essential to examine the fault condition and analyze the switch event log.

Step-by-Step Troubleshooting Tips

1. Verify Supported Transceivers: Check if the installed transceiver is supported by your Aruba AOS-CX switch. Refer to the Unsupported or Unrecognized Transceivers section for a list of supported transceivers.

2. Check Port Configuration: Verify that the port configuration matches the installed transceiver speed. For example, ensure that a 10GBase-T transceiver is installed in an SFP+/SFP28 or QSFP+/QSFP28 port.

3. Inspect Switch Event Log and Show Interface Command Output: Review the switch event log and show interface command output to identify any indication of the fault condition.

4. Check Fan Assembly: If the ambient temperature does not exceed normal room temperature, the switch may continue to operate under this condition. However, for best operation, replace the fan assembly.

5. Power Cycle the Switch: Try disconnecting power from the switch and wait a few moments before reconnecting it. This can help resolve issues with failed fan assemblies or power supplies.

6. Verify Power Source and Power Cord: Ensure that the AC power source is working properly by plugging another device into the outlet or using a different power cord.

LED flashing lights on your Aruba AOS-CX switch are often indicative of a specific issue, such as an unsupported transceiver, port configuration mismatch, self-test failure, or failed fan assembly. By following these step-by-step troubleshooting tips, you can identify and resolve the problem quickly and efficiently. Remember to refer to the corresponding diagnostic tip and Installation and Getting Started Guide for complete information on LED behaviors for your specific switch series.

Led flashing lights