Configuring The Poe Power, Priority, And Class - Cisco 500 series Administration Manual

Managing Power-over-Ethernet Devices

Configuring the PoE Power, Priority, and Class

STEP 3
Configuring the PoE Power, Priority, and Class
Cisco 500 Series Stackable Managed Switch Administration Guide
• Consumed Power—Amount of power currently being consumed by the PoE
ports.
• Available Power—Nominal power minus the amount of consumed power.
Click Apply to save the PoE properties.
The PoE Settings page displays system PoE information for enabling PoE on the
interfaces and monitoring the current power usage and maximum power limit per
port.
Click Port Management > PoE > Settings. The
This page limits the power per port in two ways depending on the Power Mode:
• Port Limit: Power is limited to a specified wattage. For these settings to be
active, the system must be in PoE Port Limit mode. That mode is configured
in the PoE Properties page.
When the power consumed on the port exceeds the port limit, the port
power is turned off.
• Class Limit: Power is limited based on the class of the connected PD. For
these settings to be active, the system must be in PoE Class Limit mode. That
mode is configured in the PoE Properties page.
When the power consumed on the port exceeds the class limit, the port
power is turned off.
PoE priority example:
Given: A 48 port switch is supplying a total of 375 watts.
The administrator configures all ports to allocate up to 30 watts. This results in 48
times 30 ports equaling 1440 watts, which is too much. The switch cannot provide
enough power to each port, so it provides power according to the priority.
The administrator sets the priority for each port, allocating how much power it can
be given.
These priorities are entered in the PoE Settings page.
Settings
page opens.
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