PoE failures

PoE power supply failure

PoE power supply exception

Symptom

PoE power supply is insufficient or the PSE cannot supply power.

Common causes

·     The power source does not match the device or has insufficient power.

·     PSE firmware failure.

·     The PD is a non standard PD and nonstandard PD detection is not enabled.

Troubleshooting flow

Figure 1 shows the troubleshooting flowchart.

Figure 1 Troubleshooting flow

Solution

1.     Verify that correct power supplies are installed on the device.

For a PoE switch, use power supplies according to the PoE power supply scheme. For information about the power supply compatibility, see the installation guide for your device.

2.     Identify whether PSE firmware is operating correctly.

Execute the display poe device command to display PSE information. If the state is faulty, the PSE has issues.

<Sysname> display poe device

Slot  1:

 PSE ID  Slot No. SSlot No. PortNum  MaxPower(W)  State  Model

 1       0        0         48       0            Faulty LSP1POEA

The output shows that the PSE has issues.

Contact Technical Support or the device vendor to obtain the PSE firmware of the target version, and then execute the poe update command to upgrade the PSE processing software in service.

<Sysname> system-view

[Sysname] poe update full POE-168.bin pse 4

This command will refresh the PSE firmware. Continue? [Y/N]:y

……

The output shows that the PSE processing software has been upgraded. Execute the display poe device command again to display PSE information, and check the on or off field for the PSE state.

[Sysname] display poe device

Slot  1:

 PSE ID  Slot No. SSlot No. PortNum  MaxPower(W)  State  Model

 1       0        0         48       0            on     LSP1POEA

3.     Execute the display poe pse command in any view to display detailed PSE information. Verify the following information:

¡     The current power, average power, and peak power of the PSE are correct.

¡     Nonstandard PD detection by the PSE is enabled.

<Sysname> display poe pse

 PSE ID                                    : 1

 Slot NO.                                  : 0

 PSE Model                                 : LSBMPOEGV48TP

 PSE Status                                : Enabled

 PSE Preempted                             : No

 Power Priority                            : Low

 Current Power                             : 130      W

 Average Power                             : 20       W

 Peak Power                                : 240      W

 Max Power                                 : 200      W

 Remaining Guaranteed Power             : 120      W

 PSE CPLD Version                         : 100

 PSE Software Version                    : 200

 PSE Hardware Version                    : 100

 Legacy PD Detection                      : Disabled

 Power Utilization Threshold            : 80

 PSE Power Policy                         : Disabled

 PD Power Policy                          : Disabled

 PD Disconnect-Detection Mode           : DC

¡     If the current power, average power, and peak power of the PSE are close to or reach the maximum power of the PSE, use PoE power with higher-wattage supply.

¡     If the PSE Legacy PD Detection field displays Disable, execute the poe legacy enable command to enable nonstandard PD detection.

4.     Execute the display poe interface command in any view to display power supply information. Verify the following information:

¡     The current power, average power, and peak power of the PSE are correct.

¡     The PoE interface current and voltage are correct.

<Sysname> display poe interface gigabitethernet 1/0/1

 PoE Status                        : Enabled

 Power Priority                    : Critical

 Oper                              : On

 IEEE Class                        : 1

 Detection Status                  : Delivering power

 Power Mode                        : Signal

 Current Power                     : 11592    mW

 Average Power                     : 11610    mW

 Peak Power                        : 11684    mW

 Max Power                         : 15400    mW

 Electric Current                  : 244      mA

 Voltage                           : 51.7     V

 PD Description                    : IP Phone For Room 101

If the current power, average power, and peak power of the PoE interface are close to or reach the maximum power of the PoE interface, execute the poe max-power command to configure the maximum power.

5.     If the issue persists, collect the information and contact Technical Support.