H3C Technologies H3C S7500E Series Switches - Manual (Page 108)

5-9
Configuring PSE 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 decide whether to allow PSE to enable PoE,
whether to supply power to a specific PSE and the power allocation method. 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.
When PoE supplies power to PSEs,
z If PSE power management is not enabled, no power will be supplied to a new PSE when
the PoE power is overloaded.
z If PSE power management priority policy is enabled, the PSE with a lower priority is first
disconnected to guarantee the power supply to the new PSE with a higher priority when the
PoE power is overloaded.
The power supply priority levels of PSE include critical, high and low in descending order.
If the guaranteed remaining PoE power (maximum PoE power minus 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, and 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 being powered.
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 the change of PSEs.
Follow these steps to configure PSE power management:
To do… Use the command… Remarks
Enter system view system-view —
Configure a PSE power
management priority policy
poe pse-policy priority
Required
Not configured by default.
Configure the power supply
priority for the PSE
poe priority { critical | high |
low } pse pse-id
Optional
low by default.