duplex mismatch discovered

Answered Question
Jun 3rd, 2010
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Hi


CISCO 3650 G 24 ports switch


%CDP-4-DUPLEX_MISMATCH: duplex mismatch discovered on GigabitEthernet0/24 (not half duplex), with Switch GigabitEthernet0/1 (half duplex)


I am getting this

my all 24 ports are setup as duplex auto but still getting this


Please help to resolve

Thanks


Asif

Correct Answer by ericn8484_2 about 7 years 3 weeks ago

Someone has connected another switch to your 24 port switch. The two switches are not auto negotiating. If its an approved switch, it would be best to set the speed/duplex on both interfaces between the two switches.

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Correct Answer
ericn8484_2 Thu, 06/03/2010 - 08:28
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Someone has connected another switch to your 24 port switch. The two switches are not auto negotiating. If its an approved switch, it would be best to set the speed/duplex on both interfaces between the two switches.

ROGER FERNANDO ... Thu, 06/03/2010 - 08:50
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Hola.


Cuando usas switches con puertas Giga, esta no negocian duplex: half.

Por eso cuando detectan en una de sus interfaces un equipo seteado en modo HALF DUPLEX envian un reporte de alarma.

En tu caso particular, te recomiendo tres cosas:

1.- Setea la interface Giga 0/24 en duplex full (forzado).

2.- Segun la alarma mostrada, el puerto del otro equipo es Giga. Verifica que esa interface este forzado en modo DUPLEX FULL.

3,. Verifica que el puerto Giga 0/24 de tu switch no este conectado a un HUB u otro switch (NO-CISCO) ya que de ser asi el mensaje de alarma estaria asociado a algun otro equipo conectado a ese HUB o switch (no-cisco).


Saludos.


Roger

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