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duplex mismatch discovered

akhanwaterloo
Level 1
Level 1

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

1 Accepted Solution

Accepted Solutions

ericn8484_2
Level 1
Level 1

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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3 Replies 3

ericn8484_2
Level 1
Level 1

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.

joshiaroon
Level 1
Level 1

try hard coding duplex and speed.

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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