Managing the Power Supply of PDs

This section describes how to configure PoE power supply management.

Context

The device supports automatic and manual power supply management modes. For the description of the two modes, see Power Supply Modes.

In addition to the two modes, PD power supply management on interfaces allows you to:

Set power-on and power-off periods.
Set PoE standard types.

Procedure

Set a power supply management mode.
1. Access the system view.
```
system-view
```
2. Set a power supply management mode.
```
poe power-management { auto | manual }
```
  By default, the automatic mode is used.
Set a power supply priority for an interface.
- In automatic mode, the device automatically manages the power supply to PDs connected to interfaces according to the priority of each interface.
  1. Access the system view.
```
system-view
```
  2. Access the view of an interface.
```
interface interface-type interface-number
```
  3. Set a power supply priority for the interface.
```
poe priority  { critical | high | low }
```
    By default,the power supply priority for the interface is low.
    
    For interfaces with the same priority, the one with the smallest interface number takes precedence.
- In manual mode, you need to manually power on or off the PD connected to each interface. The manual mode allows you to select the PDs to be powered on as required.
  1. Access the system view.
```
system-view
```
  2. Manually power on or off the PD connected to a specified interface.
```
poe {  power-on  | power-off } interface interface-type interface-number
```
  3. Access the view of an interface.
```
interface interface-type interface-number
```
  4. Set a power supply priority for the interface.
```
poe priority  { critical | high | low }
```
  Set a power-off period for the interface.
  The PD connected to an interface is not working all the time. If the PD does not work within a specified period, you can set a power-off period for the interface, so that the PD can be automatically powered off to save energy.
  1. Access the system view.
```
system-view
```
  2. Set a power-off period and access the view of the power-off period.
```
time-range time-name-name and period-range
```
  3. Return to the system view.
```
quit
```
  4. Access the view of an interface.
```
interface interface-type interface-number
```
  5. Apply the configured power-off period to the interface.
```
poe power-off time-range time-range-name
```
    If the power supply management mode changes during the power-off period, this period becomes invalid, and the new power supply management mode takes effect. For example, the interface is automatically powered on immediately after the manual mode is switched to the automatic mode during a power-off period.
- Set PoE standard types.
  The FW that supports IEEE 802.3at provides up to 30 W power supply on each interface. The FW that supports IEEE 802.3af provides up to 15.4 W power supply on each interface. These two standards of devices use different current to supply power to PDs. By default, the FW supplies power to PDs according to IEEE 802.3at. You need to know the current of the PDs in advance. If the PDs are powered on in small current, switch to the IEEE 802.3af standard to provide small current.
  1. Access the system view.
```
system-view
```
  2. Access the view of an interface.
```
interface interface-type interface-number
```
  3. Switch the IEEE 802.3at standard to the IEEE 802.3af standard, so that the device can supply power to PDs in small current.
```
poe af-inrush enable
```