Network technologies and trends

Jul 6 2010   6:13AM GMT

Cisco’s Enhance POE worked for power more than 20 watts

Posted by: Yasir Irfan
%CDP_PD-2-POWER_LOW: All radios disabled
15.4W per port
Catalyst 3560-E switches
Catalyst 3750-E
Cisco 1525 Aironet Access Point
Cisco 3750 E Switch
Cisco Access Point error
Cisco Access Points
Cisco Aironet 1250 requires 18.5W of PoE
Cisco Aironet® 1250 Series Access Point
Cisco Enhanced PoE
Cisco IOS log
Cisco IOS® Software Release 12.2(44)SE
Cisco Switches
Cisco Tips
IEEE 802.11n draft 2.0 standards
IEEE 802.3af standard
IEEE 802.3at (PoE+) standard
Powering the Cisco Aironet 1250
radio interface
radios disabled

In one of my previous articles I was talking about the POE compatibility issues between Cisco Catalyst 3750 E Switches and Cisco Aironet 1250 Series Access Point, I was getting following error.

Jun 21 08:30:28.447: %CDP_PD-2-POWER_LOW: All radios disabled – NEGOTIATED WS-C3

750E-48PD (8843.e17f.f60d)

Jun 21 08:31:28.451: %CDP_PD-2-POWER_LOW: All radios disabled – NEGOTIATED WS-C3

750E-48PD (8843.e17f.f60d)

After some research I figured out Cisco 3750 E Switch is capable of enhance POE , which can provide POE power of 20 Watts compared to standard 15.4 Watts per port, I updated the IOS for one my Cisco Catalyst 3750 E Switch from 12.2(35)SE5 to 12.2(53)SE2

 Once the IOS update was done I used the following command on the particular port to provide 20 watts of power

ITKE-AS01(config-if)# power inline port max 20000

Then AP Started working normally and all the wireless radios were up and running as demonstrated below.

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