Unanswered Question
Aug 19th, 2008
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LAP,power-supply is AIR-PWRINJ3

error message is output in wlc,

how can i resolve this ???


Log System Time Trap

0 Wed Aug 13 23:40:58 2008 AP's Interface:1(802.11a) Operation State Down: Base Radio MAC:00:1f:26:2a:b1:f0 Cause=Radio Low Power

1 Wed Aug 13 23:40:58 2008 AP's Interface:0(802.11b) Operation State Down: Base Radio MAC:00:1f:26:2a:b1:f0 Cause=Radio Low Power

2 Wed Aug 13 23:40:57 2008 AP Associated. Base Radio MAC: 00:1f:26:2a:b1:f0

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Rob Huffman Wed, 08/20/2008 - 04:33
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Hi Jian,

We had this happen to us recently due to a PoE problem. The 1130 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!


derobbacher Mon, 10/27/2008 - 06:09
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We have the same messages for Cisco LWAP 1131AG-Series Access Point.

Obviously there is a bug in the Cisco Intelligent Power Management.

You should disable the Cisco Discovery Protocol and use the CLI on the WLC to tell the APs to remove the safety checks regarding Power over Ethernet.

See command: config ap power injector enable ap override.



dennischolmes Wed, 11/05/2008 - 05:37
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Exactly. It is a CDP issue. Disable CDP on the switch ports or upgrade the code on the switch. CDP mis reports the power advertisements.


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