AP WLC poe settings

Unanswered Question
Sep 5th, 2008

In the properties of our AP1131 under the advanced tab there are poe settings. I have up on this. Most of our AP1131 are powered by Cisco 3750 switches. A few are power by Cisco poe injectors.

What are the purpose of those poe settings for the AP? How would one set them for a 3750 attached AP versus one with a poe injector.

I have this problem too.
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rob.huffman Fri, 09/05/2008 - 05:54

Hi Craig,

The settings are described in the attached dos;

The 1131 requires either IEEE 802.3af power or needs a setting on the WLC for using power injector or Cisco Pre-Standard PoE. Our older switches could only provide Cisco Pre-Standard PoE so we had to tweak the WLC Power setting for these AP's. Once we did that the Radios came right up. Here is a reference;

You may have to enter the following info in the WLC;

While the AP boots, with its Intelligent Power Management feature, it negotiates with the switch via Cisco Discovery Protocol messages in order to provide the necessary power to the AP. Even though the power injector is connected to the AP, the AP that uses this Intelligent Power Management feature gives priority to the Cisco Discovery Protocol information in order to identify whether or not the switch can provide the power. Therefore, after the Cisco Discovery Protocol message shows that the switch does not provide sufficient power (since it is not an inline power capable switch), the AP disables its radios. At this time, the status LED of the AP turns orange and this error message is recorded:

[ERROR] : AP has not enough in-line power

to enable radio slot 1 In order to overcome this problem, issue the

config ap power injector enable installed

command on the controller that is connected with this AP. This command is available from controller version Ensure that you use the correct version in the controller.

This command specifies that a power injector is used in order to supply sufficient power to the AP.

From this doc;

Cisco Aironet and WLAN Controller Product Power Options


Here is the method used via WLC GUI;


Hope this helps!


cef2lion2 Fri, 09/05/2008 - 06:30

The document says to check the pre-standard state for APs attached to our 3750 POE switches which are considered high powered switches. For POE injector you uncheck this setting.

Do I ignore the power injector state box unless I'm using a poe injector on a poe switch port?



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