2180 CHAPTER 123: P OE CONFIGURATIONConfiguring PD PowerManagementThe power priority of a PD depends on the priority of the PoE interface. Thepriority levels of PoE interfaces include critical, high and low in descending order.Power supply to a PD is subject to PD power management policies.all PSEs implement the same PD power management policies. When the PSEsupplies power to a PD,■ By default, no power will be supplied to a new PD if the PSE power isoverloaded.■ Under the control of a priority policy, the PD with a lower priority is firstpowered off to guarantee the power supply to the new PD with a higherpriority when the PSE power is overloaded.n If the guaranteed remaining PSE power (maximum PSE power - power allocated tothe critical PoE interface, regardless of whether PoE is enabled for the PoEinterface) is lower than the maximum power of the PoE interface, you will fail toset the priority of the PoE interface to critical. Otherwise, you can succeed insetting the priority to critical, this PoE interface will preempt the power of otherPoE interfaces with a lower priority level. In the latter case, the PoE interfaceswhose power is preempted will be powered off, but their configurations willremain unchanged. When you change the priority of a PoE interface from criticalto a lower level, the PDs connecting to other PoE interfaces will have anopportunity of seizing power.Configuration prerequisitesEnable PoE for PoE interfaces.Configuration procedureFollow these steps to configure PD power management:Configure the powerpriority for the PSEpoe priority { critical | high |low } [ pse pse-id ]OptionalBy default, the power priority level ofthe PSE is low.The support of the pse pse-idargument varies with devices.Configure a PSEpower managementpriority policypoe pse-policy priority OptionalBy default, no PSE powermanagement priority policy isconfigured.To do... Use the command... RemarksTo do... Use the command... RemarksEnter system view system-view -
