Diagnosing with the LEDs

This section describes LED patterns on the switch that indicate problem conditions for general switch operation troubleshooting.

  1. Check the table for the LED pattern you see on the switch.

  2. Refer to the corresponding diagnostic tip.

LED error indicators
Global status Port LED Diagnostic tip
Off with power cord plugged in N/A 1
Solid amber N/A 2
Slow flash amber N/A 3
Slow flash amber Slow flash amber1 4
Solid green Off with cable connected 5
Solid green On, but the port is not communicating 6
1

The flashing behavior is an on/off cycle approximately once every 1.6 seconds.

Diagnostic tips
Tip Problem Solution
1

The switch is not plugged into an active AC power source, or the switch power supply may have failed.

Verify that the power cord is plugged into an active power source and to the switch. Make sure that these connections are snug.

Try power cycling the switch by unplugging and plugging the power cord back in.

If the Global Status LED is still not on, verify the AC power source works by plugging another device into the outlet. Or try plugging the switch into a different outlet or try a different power cord.

If the power source and power cord are OK and this condition persists, the switch power supply may have failed. Call your Hewlett Packard Enterprise authorized network reseller, or use the electronic support services from Hewlett Packard Enterprise to get assistance.

2

A switch hardware failure has occurred. All the LEDs will stay on indefinitely.

Try power cycling the switch. If the fault indication reoccurs, the switch may have failed. Call your Hewlett Packard Enterprise-authorized network reseller, or use the electronic support services from Hewlett Packard Enterprise to get assistance.

3

The switch has experienced a software failure during self-test, or one of the switch cooling fans may have failed.

Try resetting the switch by pressing the Reset button on the front of the switch, or by power cycling the switch.

If the fault indication reoccurs, attach a console to the switch and configure it to operate at 115200 baud. Then, reset the switch. Messages appear on the console screen and in the console log identifying the error condition. You can view the console log at that point by entering “Show events” at the Manager command prompt (#).

The error may indicate that one of the fans has failed. In switches with multiple fans, the switch may continue to operate under this condition if the ambient temperature does not exceed normal room temperature. For best operation, replace the failed fan tray.

If necessary to resolve the problem, contact your Hewlett Packard Enterprise authorized network reseller, or use the electronic support services from Hewlett Packard Enterprise to get assistance.

4

The network port for which the LED is flashing has experienced a self-test or initialization failure.

If the port is an SFP/SFP+/QSFP+ transceiver, verify that it is one of the transceivers supported by the switch. Unsupported transceivers will be identified with this fault condition. The transceivers are also tested when they are “hot-swapped”—installed or changed while the switch is powered on.

To verify that the port has failed, remove and reinstall the transceiver without powering off the switch. If the port fault indication reoccurs, check the event log to see why the transceiver failed. You may have to replace the transceiver. Try power cycling the switch. Call your Hewlett Packard Enterprise-authorized network reseller, or use the electronic support services from Hewlett Packard Enterprise to get assistance.

5

The network connection is not working properly.

Try the following procedures:
  • For the indicated port, verify that both ends of the cabling, at the switch and the connected device, are connected properly.

  • Verify that the connected device and switch are both powered on and operating correctly.

  • Verify that you have used the correct cable type for the connection:
    • For fiber-optic connections, verify that the transmit port on the switch is connected to the receive port on the connected device and the switch receive port is connected to the transmit port on the connected device.

    • The cable verification process must include all patch cables from any end devices, including the switch, to any patch panels in the cabling path.

  • Verify that the port has not been disabled through a switch configuration change. Use the console interface or, if you have configured an IP address on the switch, use the web browser interface to determine the state of the port and re-enable the port if necessary.

  • Verify that the switch port configuration matches the configuration of the attached device. For example, if the switch port is configured as “Full-duplex”, the port on the attached device also MUST be configured as “Full-duplex”. If the configurations do not match, the results could be an unreliable connection, or no link at all.

  • If the other procedures do not resolve the problem, try using a different port or a different cable.

6

The port may be improperly configured, or the port may be in a “blocking” state by the normal operation of the Spanning Tree, LACP, or IGMP features.

Use the switch console to see if the port is part of a dynamic trunk (through the LACP feature), if Spanning Tree is enabled on the switch, and if the port may have been put into a “blocking” state by those features. The show lacp interfaces command displays the port status for the LACP feature; the show spanning tree command displays the port status for Spanning Tree.

Also check the Port Status screen using the show interfaces command to see if the port has been configured as “disabled”.

Other switch features that may affect the port operation include VLANs and IGMP. Use the switch console to see how the port is configured for these features.

Ensure that the device at the other end of the connection is indicating a good link to the switch. If it is not, the problem may be with the cabling between the devices or the connectors on the cable.