A PoE Exception Occurs

Symptom

An exception occurs on the PoE power supply of the device.

Possible Causes

• The AC does not support the PoE function.
• PoE is not enabled or other configurations are incorrect.
• The AP is faulty.
• The link between the AC and AP is faulty.

Troubleshooting Procedure

1. Check whether the AC supports the PoE function.
   1. Check whether the AC name contains the PWR field. If so, the AC supports PoE. For example, the AC6605-26-PWR supports PoE.
   2. A PoE-capable AC can use the PoE function only after a PoE power module is installed.
   3. If the AC does not support PoE, use a PoE switch or a DC power supply to provide power to APs.

2. Check whether the power module supports PoE.
   1. Run the display poe information command to view the PoE running information on the AC.

      <HUAWEI> display poe information
      PSE Information of slot 0:
          User Set Max Power(mW)     : 739200
          POE Power Supply(mW)       : 380000
          Available Total Power(mW)  : 376184
          Total Power Consumption(mW): 3816
          Power Peak Value(mW)       : 8745
          Power-Management Mode      : auto
          Power High Inrush          : disable

   2. If the power module does not support PoE, no PoE running information is displayed. In this case, replace the power module with a PoE-capable one, or use a PoE switch or a DC power supply to provide power to APs.

3. Check whether the PoE power module is working properly.
   1. Observe indicators on the PoE power module to check whether the PoE power module is working properly.

      Check whether the indicators on the 500 W power module (02130983) are normal.

      Indicator	Status	Description
      INPUT	Steady green	The input power is within the normal range.
      	Steady red	The input power is out of the normal range, which may be caused by the following reasons: Undervoltage Overvoltage
      	Off	The power cable is loose or no input AC power is provided.
      OUTPUT	Steady green	The AC output power is within the normal range.
      	Steady red	The output power is out of the normal range, which may be caused by the following reasons: Failure of fans in the power module Output overvoltage Output overcurrent Short circuit on the output line Overtemperature protection
      	Off	The power cable is loose or no input AC power is provided.

   2. If the PoE power module is not working properly, rectify the fault based on the indicator status.
      • If the INPUT indicator is steady red, check whether the external power supply system works properly.
      • If the OUTPUT indicator is steady red, reinstall the PoE power module and leave at least 50 mm of clearance around the device for heat dissipation.
      • If the INPUT or OUTPUT indicator is off, reinstall the PoE power module.

      For details about how to install a power module, see the WLAN Hardware Installation and Maintenance Guide.

   3. If the power module indicator is still abnormal, contact technical support personnel or Huawei agent to replace the power module.
   4. Check whether the power supply mode of the power module is consistent with that of the AP.

      Check the power parameters in the product description of the corresponding AP model and check whether the power supply mode supported by the power module is consistent with that of the AP. If not, the power supply of the AP may be affected, leading to various exceptions. For example, the AP8082DN requires 802.3at/bt power supply. Supplying 802.3af power to the AP8082DN may lead to an unexpected restart.

4. Check whether the PoE function is enabled on AC interfaces and whether the maximum output power meets AP requirements.
   1. Run the display poe power-state command to check the PoE power supply status of a PoE switch or a specified AC interface.

      <HUAWEI> display poe power-state interface GigabitEthernet 0/0/3
       Port legacy detect           : disable
       Port power enabled           : enable
       Port power ON/OFF            : on
       Port power status            : Powered
       Port PD class                : 1
       Port reference power(mW)     : 15400
       Port power priority          : Low
       Port max power(mW)           : 30000
       Port current power(mW)       : 3816
       Port peak power(mW)          : 4399
       Port average power(mW)       : 3663
       Port current(mA)             : 72
       Port voltage(V)              : 53

   2. If the Port power enabled field is displayed as disable, the PoE function is disabled on the interface. Run the poe enable command to enable the PoE function on the interface.

      <HUAWEI> system-view 
      [HUAWEI] interface gigabitethernet 0/0/3 
      [HUAWEI-GigabitEthernet0/0/3] poe enable 
      [HUAWEI-GigabitEthernet0/0/3] quit

   3. If the power supply management mode on the AC is manual, run the poe { power-off | power-on } interface command to power on or off this interface.

      If the AC has insufficient available power and cannot supply power to newly connected powered devices (PDs), the poe power-on interface command does not take effect.

      [HUAWEI] poe power-on interface gigabitethernet 0/0/3

   4. If the maximum PoE output power of the AC does not meet the AP load requirements, run the poe max-power command to set the maximum PoE output power.

      If the configured maximum output power is lower than the total power required by PDs, lower-priority PDs will be powered off or cannot be powered on manually.

      [HUAWEI] poe max-power 45000 slot 0

   5. If the Port power ON/OFF field displays on, the interface is powered on. Check whether the AP is working properly. For details, see 6.

5. Check whether the maximum PoE output power of the AC meets requirements.
   1. Run the display poe information command to check the maximum PoE output power of the AC.
      • The maximum PoE output power of an AC must meet the load requirements of APs connected to the AC.
      • In automatic power supply mode, an AC powers on the PDs connected to high-priority ports and powers off the PDs connected to low-priority ports if the AC cannot provide sufficient power.

      <HUAWEI> display poe information
      PSE Information of slot 0:
          User Set Max Power(mW)     : 739200
          POE Power Supply(mW)       : 380000
          Available Total Power(mW)  : 376184
          Total Power Consumption(mW): 3816
          Power Peak Value(mW)       : 8745
          Power-Management Mode      : auto
          Power High Inrush          : disable

   2. If the maximum PoE output power does not meet the load requirements of APs, run the undo poe max-power command to restore the default setting so that the AC can dynamically provide the maximum output power.

      By default, the maximum PoE output power of an AC is the total output of PoE power modules.

      <HUAWEI> system-view
      [HUAWEI] undo poe max-power

   3. If the maximum PoE output power of the AC still cannot meet the load requirements of APs connected to the AC, reduce the number of APs powered by the AC or increase PoE power modules on the AC.

6. Check whether the AP works properly.
   1. Replace the AP to check whether the AP works properly.
   2. If the system power is sufficient, run the poe force-power command to forcibly power on the AP if the AC cannot detect the AP.

      If a PoE interface connects to a non-PoE device, use this command with caution.

      <HUAWEI> system-view
      [HUAWEI] interface gigabitethernet 0/0/1
      [HUAWEI-GigabitEthernet0/0/1] poe force-power
      Warning: Is there a valid PD connected to this interface? Yes or No?[Y/N]:y

   3. The AP provides PoE power supply based on IEEE 802.3at by default. If an AP supports only IEEE 802.3af, run the poe af-inrush enable command to change the PoE power supply standard of the AP to IEEE 802.3af.

      After running the poe af-inrush enable command, remove the non-IEEE 802.3at PDs and then install them so that the PDs can be powered on.

      <HUAWEI> system-view
      [HUAWEI] poe af-inrush enable slot 0
      Warning: This operation may cause PD work abnormal. Continue?[Y/N]:y

   4. If a compatibility error occurs between the PoE switch and AP, forcibly power on the AP.

      When the AP3010DN, AP5010DN, AP5010SN, AP6010DN, AP6010SN, AP6310SN, AP6510DN, AP6610DN, AP7110DN, or AP7110SN connects to the S2300 and S2700 series PoE switches, a compatibility error may occur.

      • Enable forcible power supply on the interface.

        <HUAWEI> system-view
        [HUAWEI] interface gigabitethernet 0/0/1
        [HUAWEI-GigabitEthernet0/0/1] poe force-power
        Warning: Is there a valid PD connected to this interface? Yes or No?[Y/N]:y

      • Configure the device to allow high inrush current during power-on.

        <HUAWEI> system-view
        [HUAWEI] poe high-inrush enable

      • Enable GigabitEthernet0/0/1 to check compatibility of PDs.

        [HUAWEI] interface gigabitEthernet 0/0/1
        [HUAWEI-GigabitEthernet0/0/1] poe legacy enable
        Warning: Is there a valid PD connected to this interface? Yes or No?[Y/N]:y

7. Check whether cables are properly connected.
   1. Check whether the network cables meet requirements.

      The requirements for the type and maximum transmission distance of the network cable vary depending on the AP model. In most cases, the Cat5e network cable is used, with a transmission distance of no more than 100 m. For details, see "Cable Connection" in the Hardware Installation and Maintenance Guide of the corresponding AP model.

   2. Check whether the network cable and RJ45 connectors are working properly.
      1. Use a finished network cable to connect to the PoE switch or AC, and check whether the AP is powered on.
      2. Use a go-no go gauge to check whether the size of the RJ45 connectors complies with the standard, and the crimping quality.
      3. Run the virtual-cable-test command on the PoE switch or AC to check whether the network cable works properly.

         Running the virtual-cable-test command will interrupt services on the switch or AC interface.

         [HUAWEI] interface gigabitethernet 0/0/1
         [HUAWEI-GigabitEthernet0/0/1] virtual-cable-test
         Warning: The command will stop service for a while. Continue?[Y/N]y
         Info: This operation may take a few seconds. Please wait for a moment..........done.
         Pair A length: 189meter(s)
         Pair B length: 189meter(s)
         Pair C length: 189meter(s)
         Pair D length: 189meter(s)
         Pair A state: Ok
         Pair B state: Ok
         Pair C state: Ok
         Pair D state: Ok

   3. If a digital distribution frame (DDF) is used, RJ45 connectors may be loose from the DDF. Perform cross tests to check whether the communication failure is caused by a disconnection on the DDF.
   4. Check the grounding condition of the PoE switch or AC.
      1. Check whether the PoE switch or AC is effectively grounded according to the installation guide.
      2. Check whether the outdoor AP is properly grounded.
      3. Check whether the PoE switch or AC is grounded at the same point as the outdoor AP.

         If the PoE switch or AC is grounded at a different point from the outdoor AP and potential difference between the two locations is large, PoE power supply may fail after a ground cable or an external antenna is installed on the AP.

         In this case, perform the following steps:

         • Run the poe force-power or poe legacy enable command on an interface of the PoE switch or AC to forcibly power on the PoE switch or AC.
         • Change the ground point if permitted.
         • If surge protection is not required, you are advised to use the insulating material to isolate the ground points of APs.

8. Collect fault information.
   • Version information

     [Huawei-diagnose] vrbd

   • Patch information

     <Huawei> display patch-information

   • Configuration information

     <Huawei> display current-configuration

   • PoE information

     <Huawei> display poe information

   • Log information

     [Huawei-diagnose] display logfile buffer
     [Huawei-diagnose] display diag-logfile buffer
     [Huawei-diagnose] display display trapbuffer

     Export all log files (in the .dblg, .log, .dblg.zip, or .log.zip format) that record the fault occurrence time in the flash:/logfile directory using FTP or through the web platform.