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Catalyst 3750-X and 3560-X Switch Software Configuration Guide
OL-25303-03
Chapter 1 Configuring Interface Characteristics
Configuring Ethernet Interfaces
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.
To configure a power management mode on a PoE-capable port, follow these steps beginning in privileged
EXEC mode:
For information about the output of the show power inline user EXEC command, see the command
reference for this release. For more information about PoE-related commands, see the “Troubleshooting
Power over Ethernet Switch Ports” section on page 1-13. For information about configuring voice
VLAN, see Chapter 1, “Configuring Voice VLAN.”
Command Purpose
Step 1
configure terminal Enters global configuration mode.
Step 2
interface interface-id Specifies the physical port to be configured, and enter interface
configuration mode.
Step 3
power inline {auto [max max-wattage] |
never | static [max max-wattage]}
Configures the PoE mode on the port. The keywords have these
meanings:
• auto—Enables 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—Limits the power allowed on the port.
The range is 4000 to 30000 mW. If no value is specified, the
maximum is allowed.
• never—Disables device detection, and disable power to the port.
Note If a port has a Cisco powered device connected to it, do not use
the power inline never command to configure the port. A false
linkup can occur, placing the port into the error-disabled state.
• static—Enables powered-device detection. Preallocate (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.
Step 4
end Returns to privileged EXEC mode.
Step 5
show power inline [interface-id |
module switch-number]
Displays PoE status for a switch or a switch stack for the specified
interface or for a specified stack member.
The module switch-number keywords are supported only on Catalyst
3750-X switches.
Step 6
copy running-config startup-config (Optional) Saves your entries in the configuration file.
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