Configuring Pd Power Management - H3C S5500-EI series Operation Manual

Operation Manual – PoE
H3C S5500-EI Series Ethernet Switches
Caution:
After a PoE configuration file is applied to a PoE interface, other PoE configuration
files can not take effect on this PoE interface.
If a PoE configuration file is already applied to a PoE interface, you must execute
the undo apply poe-profile command to remove the application to the interface
before deleting or modifying the PoE configuration file.
If you have configured a PoE interface through the command line, you cannot
configure it through a PoE configuration file again. If you want to reconfigure the
interface through a PoE configuration file, you must first remove the command line
configuration on the PoE interface.
You must use the same mode (command line or PoE configuration file) to configure
the poe max-power max-power and poe priority { critical | high | low }
commands.

1.4 Configuring PD Power Management

The power priority of a PD depends on the priority of the PoE interface. The priority
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 PSE supplies
power to a PD,
By default, no power will be supplied to a new PD if the PSE power is overloaded.
Under the control of a priority policy, the PD with a lower priority is first powered off
to guarantee the power supply to the new PD with a higher priority when the PSE
power is overloaded.
Note:
If the sudden increase of the power of the PD results in PSE power overload, power
supply to the PD on the PoE interface with a lower priority will be stopped.
If the guaranteed remaining PSE power (power allocated to the critical PoE interface
subtracted from maximum PSE power, regardless of whether PoE is enabled for the
PoE interface) is lower than the maximum power of the PoE interface, you will fail to set
the priority of the PoE interface to critical. Otherwise, you can succeed in setting the
priority to critical, and this PoE interface will preempt the power of other PoE interfaces
with a lower priority level. In the latter case, the PoE interfaces whose power is
1-5
Chapter 1 PoE Configuration