z
auto
: When the switch is close to its full load in supplying power, it will first supply power to the PDs
that are connected to the ports with critical priority, and then supply power to the PDs that are
connected to the ports with high priority. For example: Port A has the priority of critical. When the
switch PoE is close to its full load and a new PD is now added to port A, the switch will power down
the PD connected to the port with the lowest priority and turn to supply power to this new PD. If
more than one port has the same lowest priority, the switch will power down the PD connected to
the port with larger port number.
z
manual
: When the switch is close to its full load in supplying power, it will not make change to its
original power supply status based on its priority when a new PD is added. For example: Port A has
the priority critical. When the switch PoE is close to its full load and a new PD is now added to port
A, the switch just gives a prompt that a new PD is added and will not supply power to this new PD.
After the PoE feature is enabled on the port, perform the following configuration to set the PoE
management mode and PoE priority of a port.
Follow these steps to set the PoE management mode and PoE priority of a port:
To do…
Use the command…
Remarks
Enter system view
system-view
—
Set the PoE management
mode for the switch
poe power-management
{ auto | manual }
Required
auto
by default.
Enter Ethernet port view
interface interface-type
interface-number
—
Se the PoE priority of a port
poe priority
{
critical
|
high
|
low
}
Required
low
by default.
Setting the PoE Mode on a Port
PoE mode of a port falls into two types, signal mode and spare mode.
z
Signal mode: DC power is carried over the data pairs (1,2,3,and 6) of category-3/5 twisted pairs.
z
Spare mode: DC power is carried over the spare pairs (4,5,7,and 8) of category-3/5 twisted pairs.
Currently, Switch 4500 does not support the spare mode.
After the PoE feature is enabled on the port, perform the following configuration to set the PoE mode on
a port.
Follow these steps to set the PoE mode on a port:
To do…
Use the command…
Remarks
Enter system view
system-view
—
Enter Ethernet port view
interface interface-type
interface-number
—
Set the PoE mode on the port
to signal
poe mode
signal
Optional
signal
by default.
49-4
