Huawei Quidway S9300 Configuration Manual page 135

Quidway S9300 Terabit Routing Switch
Configuration Guide - Device Management
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Issue 03 (2011-12-29)
The maximum output power of a board is set.
The value of slot_max_power ranges from 0 to the maximum output power of the PoE
power supplies in the system. The unit is mW.
By default, the maximum output power of a PoE board depends on the power of the
PoE power supply provided by the system.
Optional: Setting the PoE power supply management mode
1. Run:
system-view
The system view is displayed.
2. Run:
poe power-management { auto | manual } slot slot-id
The PoE power supply management mode of the board in the specified slot is set.
By default, the S9300 uses the automatic power management mode.
Optional: Configuring a board to allow high inrush current during power-on
If a PD does not comply with IEEE 802.3at or 802.3af, high inrush current is generated
when the PD is powered on. In this case, the PSE cuts off the power of the PD to protect
itself. If the PSE is required to provide power for the PD, the PSE must allow high inrush
current.
1. Run:
system-view
The system view is displayed.
2. Run:
poe high-inrush enable slot slot-id
A PoE board is configured to allow high inrush current during power-on.
By default, a board does not allow high inrush power during power-on.
Optional: Setting the percentage of the reserved PoE power against the total PoE power
The S9300 can dynamically allocate power to each interface according to the power
consumption of each interface. The power consumption of a PD keeps changing when the
PD is running. The S9300 periodically calculates the total power consumption of all the
PDs connected to boards. If the total power consumption exceeds the upper threshold of
the board, the S9300 cuts off the power of the PDs on the interfaces of low priority to ensure
that other PDs can run normally.
Sometimes, the power consumption increases sharply and the available power of a board
or the entire equipment cannot support the burst increase of power. At this time, the software
system has not found that the total power consumption exceeded the upper threshold;
therefore, the S9300 does not power off interfaces of low priority in time. As a result, the
PoE power supply is shut down for overload protection, and hence all PDs are powered
off.
This problem can be solved by setting proper reserved power. When the power consumption
increases sharply, the reserved power can support the system running. Then the system
software has time to power off interfaces of low priority to ensure stable running of other
PDs.
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7 PoE Power Supply Configuration
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