Huawei Quidway S3700 Series Configuration Manual page 131

Quidway S3700 Series Ethernet Switches
Configuration Guide - Device Management
l
l
l
Issue 01 (2011-07-15)
The system view is displayed.
2. Run:
poe power-on interface interface-type interface-number or poe power-off
interface interface-type interface-number
The PD connected to an interface is powered on or powered off manually.
(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
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 S3700 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 S3700 periodically calculates the total power consumption of all the
PDs connected to the device. If the total power consumption exceeds the upper threshold
of the board, the S3700 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 the device
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 S3700 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.
1. Run:
system-view
The system view is displayed.
2. Run:
poe power-reserved reserved-power-percent [ slot slot-id ]
The percentage of the reserved PoE power against the total PoE power is set.
By default, 20% of the total PoE power is reserved.
(Optional) Setting the alarm threshold of power consumption percentage
1. Run:
system-view
Huawei Proprietary and Confidential
Copyright © Huawei Technologies Co., Ltd.
9 PoE Configuration
121