POE troubleshooting method

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The idea of locating the fault is: first check whether the powered PD device meets the POE power supply requirements of our device, then check the power supply status of the device's POE interface, and finally collect and check related information analysis according to the error message when the POE function is enabled.

1.Check network cable distance

It is recommended that the power supply device and the power receiving PD device use a twisted pair cable with specifications exceeding Category 5 and above, and the distance is less than 100 meters.

2.Enable non-standard PD detection function

Only after the non-standard PD function can be detected on our equipment, the equipment can detect the non-standard PD and supply power to it.

Command:poe legacy enable pse pse-id

3.Check the working status of the PoE interface of a device failure

Command:display poe interface gigabitethernet

<H3C> display poe interface gigabitethernet 1/0/1

 Port Power Enabled               : enabled

 Port Power Priority              : high

 Port Operating Status            : on

 Port IEEE Class                   : 0

 Port Detection Status            : delivering-power

 Port Power Mode                   : signal

Port Operating Status

l off: The power supply function is disabled

l on: power is being supplied normally

l power-lack: The remaining guaranteed power of the PSE is insufficient, resulting in the inability to supply power to the PoE interface with priority Critical

l power-deny: refuse to supply power, the PD requires more power than the configured power

l power-itself: The external device is powering itself

l power-limit: The power is being restricted, and the PD requires more power than the configured power, and the PSE still supplies power according to the configured power

Port Detection Status

l disabled: PoE interface power supply is prohibited

l searching: searching PD

l Delivering-power: Power is being supplied to PD

l fault: error

l test: test status

l other-fault: other error status

l pd-disconnect: PD is not connected

4.Check whether an error is prompted when poe enable is enabled on the interface

[H3C]int Ethernet 1/0/1

[H3C-Ethernet1/0/1]poe enable

PoE is not supported on the port!

5.Use FULL mode to upgrade device PSE file

If an error is displayed when the POE function is enabled on the interface, use the FULL mode to upgrade the PSE processing software. 

Command: poe update full filename pse pse-id

For example: Upgrade S5120-EI switch PSE processing software

[H3C] poe update full 00061204_0384_001_h3c.bin pse 4

This command will refresh firmware on the specific PSE(s), Continue? [Y/N]:y

 System is downloading firmware into the hardware. Please wait ..

 Update success

Note: Please contact H3CTS after-sales service for the PSE processing software required for the upgrade.

6. If the interface does not prompt an error when the POE function is enabled,Collect and feedback equipment related POE fault information.  Please collect the following information and feed it back to the after-sales engineer.

(1) Collect POE status information on the device at the time of failure.

<H3C>dis power

<H3C>dis poe device

<H3C>dis poe pse

<H3C> dis poe interface and dis poe int gx/x/x (collect both faulty and normal ports)

<H3C>dis poe interface power

<H3C>sys

[H3C] en_diag

[H3C-diagnose] debug poe dimm-status unit_id (the default unit_id of non-IRF devices is 1)

[H3C-diagnose] debug poe port-power unit_id

[H3C-diagnose] debug poe pse-info unit_id

[H3C-diagnose] debug poe sys-status unit_id

(2) Collect the diagnostic information of the equipment at the time of failure.

<H3C>dis diag