3Com Switch 8800 Advanced Software V5 Configuration Guide

1016 CHAPTER 78: POE CONFIGURATION
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.
If the guaranteed remaining PSE power (maximum PSE power - power to be
allocated to the critical PoE interface, 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 preempted will be powered off, but their configurations will
remain unchanged. When you change the priority of a PoE interface from critical
to a lower level, the PDs connecting to other PoE interfaces will have an
opportunity of seizing power.
Configuration prerequisites
Enable PoE for PoE interfaces.
Configuration procedure
Follow these steps to configure PD power management:
Configure the power priority
for the PSE
poe priority { critical | high |
low } pse pse-id
Optional
By default, the power priority
level of the PSE is low.
Configure a PSE power
management priority policy
poe pse-policy priority Optional
By default, no PSE power
management priority policy is
configured.
To do... Use the command... Remarks
To do... Use the command... Remarks
Enter system view system-view -
Configure the
power priority for a
PoE interface.
Configure the power
priority for the PoE
interface in PoE
interface view
interface
interface-type
interface-number
Use either approach.
By default, the power
priority of a PoE
interface is low.
poe priority { critical |
high | low }
Configure the power
priority for the PoE
interface in PoE
configuration file view
poe-profile
profile-name [ index ]
poe priority { critical |
high | low }