Configuring A Power Management Mode On A Poe Port - Cisco Catalyst 2975 Software Configuration Manual

Chapter 12 Configuring Interface Characteristics
Switch(config-if)# mdix auto
Switch(config-if)# end

Configuring a Power Management Mode on a PoE Port

For most situations, the default configuration (auto mode) works well, providing plug-and-play
operation. No further configuration is required. However, use the following procedure to give a PoE port
higher priority, to make it data only, or to specify a maximum wattage to disallow high-power powered
devices on a port.
Note When you make PoE configuration changes, the port being configured drops power. Depending on the
new configuration, the state of the other PoE ports, and the state of the power budget, the port might not
be powered up again. For example, port 1 is in the auto and on state, and you configure it for static mode.
The switch removes power from port 1, detects the powered device, and repowers the port. If port 1 is
in the auto and on state and you configure it with a maximum wattage of 10 W, the switch removes power
from the port and then redetects the powered device. The switch repowers the port only if the powered
device is a Class 1, Class 2, or a Cisco-only powered device.
Beginning in privileged EXEC mode, follow these steps to configure a power management mode on a
PoE-capable port:
Command
Step 1 configure terminal
Step 2 interface interface-id
Step 3 power inline {auto [max max-wattage] |
never | static [max max-wattage]}
Step 4
end
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Purpose
Enter global configuration mode.
Specify the physical port to be configured, and enter interface
configuration mode.
Configure the PoE mode on the port. The keywords have these meanings:
auto—Enable powered-device detection. If enough power is
•
available, automatically allocate power to the PoE port after device
detection. This is the default setting.
(Optional) max max-wattage—Limit the power allowed on the port.
•
The range is 4000 to 15400 milliwatts. If no value is specified, the
maximum is allowed (15400 milliwatts).
never—Disable device detection, and disable power to the port.
•
If a port has a Cisco powered device connected to it, do not use
Note
the power inline never command to configure the port. A false
link-up can occur, placing the port into an error-disabled state.
static—Enable powered-device detection. Pre-allocate (reserve)
•
power for a port before the switch discovers the powered device. The
switch reserves power for this port even when no device is connected
and guarantees that power will be provided upon device detection.
The switch allocates power to a port configured in static mode before it
allocates power to a port configured in auto mode.
Return to privileged EXEC mode.
Catalyst 2975 Switch Software Configuration Guide
Configuring Ethernet Interfaces
12-23