3Com Switch 7750 Series
Command Reference Guide – PoE Chapter 1 PoE Configuration Commands
1-13
By default, the PoE management mode of the switch is auto.
This command and the PoE priority settings of PoE ports will work together to control
the power feeding of the switch when the switch is reaching its full power load in power
supply.
z auto mode: When the switch is reaching its full load in supplying power, it will first
supply power to the PDs that are connected to the ports with critical priority, and
secondly supply power to the PDs that are connected to the ports with high priority.
For example: Port A has the power priority of critical. When the switch is reaching
full load and a new PD is now added to the port A, the switch will power down a PD
that is connected to a port with the lowest priority and turn to feed this new PD.
z manual mode: When the switch is reaching its full load in supplying power
externally and a new PD is added, it will neither take the priority into account nor
make change to its original power supply status; only the information about the
newly added device is provided. For example: Port A has the priority of critical.
When the switch is reaching full load and a new PD is now connected to port A, the
switch does not supply power to this new device.
Example
# Configure the PoE management mode of the board in slot 3 of the switch to auto.
<3Com> system-view
System View: return to User View with Ctrl+Z.
[3Com] poe power-management auto slot 3
1.1.13 poe priority Syntax
poe priority { critical | high | low }
undo poe priority
View
Ethernet port view
Parameter
critical: Sets the PoE priority of the port to critical.
high: Sets the PoE priority of the port to high.
low: Sets the PoE priority of the port to low.
Description
Use the poe priority command to configure the PoE priority of a port.
Use the undo poe priority command to restore the default PoE priority.