Configuring Poe Power Management; Configuring Pse Power Management - 3Com MSR 50 Series Configuration Manual

Configuring PoE
Power Management
Configuring PSE Power
Management
If you have configured a PoE interface through the command line, you cannot
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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
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configure the poe max-power max-power and poe priority { critical | high |
low } commands.
PoE power management involves PSE power management and PD power
management.
Where the maximum PoE power may be lower than the sum of the maximum
power required by all PSEs, PSE power management is applied to guarantee power
supply to important PSE. Where the maximum PoE power of the device is higher
than the sum of the maximum power required by all PSEs, it is unnecessary to
enable PSE power management.
Power supply to the PSE is subject to PSE power management policies.
When the PoE power supplies power to the PSE,
By default, no power will be supplied to new PSE when the PoE power is
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overloaded.
Under the control of a priority policy, the PSE with a lower priority is first
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disconnected to guarantee the power supply to the new PSE with a higher
priority when the PoE power is overloaded.
The power priority levels of PSE include critical, high and low in descending order.
If the guaranteed remaining PoE power (guaranteed maximum PoE power - power
allocated to the critical PSE, regardless of whether PoE is enabled for the PSE) is
lower than the maximum power of the PSE, you will fail to set the power priority
of the PSE to critical. Otherwise, you can succeed in setting the power priority to
critical, this PSE will preempt the power of the PSE with a lower priority level. In
the latter case, the PSE whose power is preempted will be disconnected, but its
configuration will remain unchanged. After you change the priority of the PSE
from critical to a lower level, other PSEs will have an opportunity of seizing power.
n
The guaranteed PoE power is used to guarantee that the key PSE in the device can
be supplied with power all the time, without being influenced by the change of
PSE. The device model determines whether the guaranteed maximum PoE power
is equal to the maximum PoE power.
Configuration prerequisites
Enable PoE for the PSE.
Configuration procedure
Follow these steps to configure PSE power management:
To do...
Enter system view

Configuring PoE Power Management

Use the command...
system-view
Remarks
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