Port Off as Underload Detected

[yoonie2]

Hello, I came across a network system that used 3 OmniSwitch 6450 PoE switches.
The customer came across a problem that shut down their network.
The customer then proceeded to pull out all the cables and connect them all again which miraculously seemed to get rid of the problem.
I was asked to track down what the problem was.
When I used show log swlog to see what was wrong, I noticed that the ports were shut down due to an "Underload Detected".
I haven't seen this error before, what would this usually mean?



LANPOWER info Port 1/3 turned OFF/Port Off as Underload Detected (10)

[silvio]

Hi,
in the KB there is one entry for this:
Non-PD connected ports show "Fault CAPDE" error (at command "show lanpower 1")
Analysis
Fault CAPDE error means the out of range capacitor value is detected by the PoE controller of the switch. Hence, the lanpower of the port is disabled.
...
Deny => Power Manager Algorithms have denied the power to this channel either due to priority disconnect or oversubscription.
Denied UDL: - Port is off, underload state according to 802.3af (current is below Imin).
...
Fault => Activation or class detection has failed, or an active channel has violated a boundary parameter.
Fault UD/OV: - Port is off, the succession of Underload and Overload states caused port shutdown. Maybe also caused by a PD’s DC/DC fault.
....
Note: It is recommended to turn on lanpower only on the ports where Powered Devices are connected to avoid these errors.

best regards
Silvio

[thermseeker]

Hello there,

Is there a way to configure the switch to disable the underload detection? I havent' found anything about that in the manuals. I have IP phones that are being denied power with "Denied UDL" status.

Thanks,
Tales

[thermseeker]

The same phones that in some cases get "Denied UDL" are now also showing "Fault CAPDE". What a piece of garbage. They are ATCOM D38 phones, steer clear of those. I have 20 units to get rid of.

[JoseMPH]

Hola!
Esperando se encuentren bien y esperando que esta información le sea de utilidad a esta comunidad, tuve el mismo problema, en los logs de mi SW me mandaba el error: "LANPOWER info Port 1/5 turned OFF/ Port Off as Underload detected (10)", pero no solo de un puerto, de varios y esto se presentaba constantemente. Apliqué las recomendaciones que se mencionan en este foro, pero ninguna me dio solución a mi problema, el error de LANPOWER seguía apareciendo.
Afortunadamente tuve la oportunidad de cambiar ese sw y hacer un laboratorio, le conecté 3 teléfonos IP y luego de una semana no tuvo ningún error, entonces comencé a simular error en el cableado, como que este haciendo un falso contacto, o esté mal conectado, todo esto lo hice manualmente y al revisar los logs nuevamente observé el error de LANPOWER sobre esos puertos.
Ya en sitio donde se me originó el problema, al revisar el cableado me percaté que efectivamente, varios teléfonos tienen mal el cableado, incluso hasta hilos del cable roto, al hacer estas correcciones, el problema se solucionó. Espero y esta información sea de ayuda y sea parte de la solución para algún otro Ingeniero, saludos.

Saludos coordiales, Ing. José Peñafiel

[silvio]

Hi Jose, write your question in english please.

[JoseMPH]

Ok Silvio, I get it.

Hello!
Hoping you are well and hoping that this information is useful to this community, I had the same problem, in the logs of my SW it sent me the error: "LANPOWER info Port 1/5 turned OFF/ Port Off as Underload detected (10)", but not only for one port, for several and this occurred constantly. I applied the recommendations mentioned in this forum, but none of them gave me a solution to my problem, the LANPOWER error kept appearing.
Fortunately I had the opportunity to change that SW and do a laboratory, I connected 3 IP phones to it and after a week it did not have any errors, then I began to simulate an error in the wiring, such as that it is making a false contact, or it is connected incorrectly, I did all this manually and when reviewing the logs again I observed the LANPOWER error on those ports.
Already in the place where the problem originated, when I checked the wiring I realized that indeed, several phones have bad wiring, even down to broken cable wires, by making these corrections, the problem was solved. I hope this information is helpful and is part of the solution for some other Engineer, greetings.

Best regards.
Ing. José Peñafiel

[silvio]

Hi Jose,
hello in the forum here. I think your information is very helpful. For me I never heard about this reason.
thanks a lot and best regards
Silvio