I currently have a strange situation with a WLC 2112 and LWAPP APs. I have a basic hub and spoke network with 2 GB trunks via fiber to remote switches from a 3750G. The remote switches are a 2960 and a 2948G-GE-TX.
I have 4 of the 1130ag APs plugged into the 3750G which is where the 2112 is connected. The WLC sees them and configures the APs just fine. When I plug one of the APs (with a Cisco power injector) into a remote switch (2960 or 2948) The APs report to the controller but shuts down the radio with an error in the event log stating LOW-INLINE-POWER.
I know most would think your PoE isn't cutting it, but in a lab environment we tried the failing ones with the exact same APs reporting this problem and it worked as long as they were plugged into the same switch as the WLC 2112. As soon as we plugged them into a switch that was trunked we got the same error.
It's almost like the trunks are not passing the LWAPP info or something even though they show up in the WLCs AP list.
The required settings are described in the attached docs;
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 184.108.40.206. 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