Configuring Poe Interface Power Management - HP MSR Series Configuration Manual

to critical, and this PSE preempts the power of the PSE that has a lower priority level. In this case, the PSE
whose power is preempted is disconnected, but its configuration remains unchanged. If you change the
priority of the PSE from critical to a lower level, other PSEs have an opportunity to be powered.
To configure PSE power management:
Step
1. Enter system view.
2. Configure a PSE power
management priority policy.
3. Configure the power supply
priority for the PSE.
NOTE:
The guaranteed PoE power is used to guarantee that the key PSEs in the device can be supplied with
•
power all the time, without being influenced by a change of PSEs.
The guaranteed maximum PoE power is equal to the maximum PoE power.
•

Configuring PoE interface power management

The power supply priority of a PD depends on the priority of the PoE interface. In descending order, the
power-supply priority levels of a PoE interface are critical, high, and low. Power supply to a PD is subject
to PoE interface power management policies.
All PSEs implement the same PoE interface power management policies. If PoE supplies power to a PD,
the following actions occur:
• If the PoE power is overloaded and PSE power management is not enabled, no power is supplied
to a new PD.
If the PoE power is overloaded and a PSE power-management-priority policy is enabled, the PD that
•
has a lower priority is first disconnected to guarantee the power supply to a new PD that has a
higher priority.
The guaranteed remaining PoE power is the maximum PoE power minus the power allocated to the
critical PoE interface, regardless of whether PoE is enabled for the PoE interface. If this is lower than the
maximum power of the PoE interface, you cannot set the power priority of the PoE interface to critical.
Otherwise, you can set the power priority to critical, and this PoE interface preempts the power of the PoE
interface that has a lower priority level. In this case, the PoE interface whose power is preempted is
disconnected, but its configuration remains unchanged. If you change the priority of the PoE interface
from critical to a lower level, the PDs connecting to other PoE interfaces have an opportunity to be
powered.
A guard band of 19 watts is reserved for each PoE interface on the device to prevent a PD from being
powering off because of a sudden increase of power. If the remaining power of the PSE is lower than 19
watts and no priority is configured for a PoE interface, the PSE does not supply power to the new PD. If
the remaining power of the PSE is lower than 19 watts, but priorities are configured for PoE interfaces, the
PoE interface that has a higher priority can preempt the power of a PoE interface that has a lower priority
to ensure normal operation of the higher priority PoE interface.
If a sudden increase of the PD power results in PSE power overload, power supply to the PD on the PoE
interface that has a lower priority is stopped to ensure power supply to the PD that has a higher priority.
Command
system-view
poe pse-policy priority
poe priority { critical | high | low }
pse pse-id
158
Remarks
N/A
By default, this policy is not
configured.
Optional.
By default, the power supply
priority for the PSE is low.