Configuring the PoE Power

This section describes how to configure the PoE power.

Context

You can specify the maximum output power of PoE power supply, and set the ratio of reserved PoE power, PoE alarm threshold, and maximum output power of each interface. You need to learn about the power of each PD and set power parameters based on the power requirements of the PDs connected to the device to effectively use the PoE power and ensure the stable running of the system.

Procedure

Set the maximum output power of PoE power supply on the device.
1. Access the system view.
```
system-view
```
2. Set the maximum output power of PoE power supply.
```
poe max-power max-power
```
  By default, the maximum output power of PoE power supply on the device is 60000 mW.
Set the maximum output power of an interface.
For some non-standard and unclassified PDs, the power negotiation results may be different from the actual power required by the PDs. Setting the maximum output power of an interface protects the PD from overload and saves power.
1. Access the system view.
```
system-view
```
2. Access the view of an interface.
```
interface interface-type interface-number
```
3. Set the maximum output power of the interface.
```
poe power port-max-power
```
  By default, the maximum output power of an interface is 30000 mW.
Set the ratio of reserved PoE power.
During running, the power consumption of each PD keeps changing. In some cases, when power consumption increases sharply, the remaining power of the system cannot support the increasing power consumption. The software system may not have time to power off the PDs connected to interfaces with low priorities before PoE overload protection is triggered. As a result, all PDs are powered off. To prevent such a situation, you need to properly set the reserved power of the system. The reserved power supports sharply increasing power requirements, so that the PSE has time to power off the PDs connected to interfaces with low priorities.
1. Access the system view.
```
system-view
```
2. Set the ratio of the reserved PoE power to the maximum output power.
```
poe power-reserved power-reserved
```
  The default ratio is 20%.
Set a PoE alarm threshold.
The reserved power can deal with the power increase within a certain range. If power consumption is too high, some PDs may be powered off. You can set an alarm threshold, so that an alarm is generated when power consumption exceeds the alarm threshold. In this case, you should take measures to reduce the power consumption.
1. Access the system view.
```
system-view
```
2. Set a PoE alarm threshold.
```
poe power-threshold threshold-value
```
  The default alarm threshold is 90% of the maximum PoE output power. When power consumption exceeds 90% of the maximum PoE output power, the POE_1.3.6.1.4.1.2011.5.25.195.40.17 hwPoePowerOverUtilizationThreshold alarm is generated.