Hard Code duplex and speed on 2960

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Nov 25th, 2008
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I tried to hard code duplex and speed on 2960 switch gig ports. I have 3 switches in series. I go to the last one code speed 1000 and duplex full and it takes the commands. Then On the second I code the same to the connecting port afterword the last switch loses the connection. I can get the connection back by setting the second switch back to

Speed auto and duplex auto. Any suggestion

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rduke Tue, 11/25/2008 - 12:15
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You are using a switch with a dual purpose uplink so you have to specify "media-type rj-45" or "media-type sfp" in order to set the duplex; however, for gigabit you should always be running full duplex would you not ? I have had to set the speed and duplex when using 100FX type SFPs in these switches and this does fix that problem.


glen.grant Tue, 11/25/2008 - 12:24
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Sounds like you are using the wrong type of cable and the switch is using mdix to correct the cable . Mdix will only work when the speed and duplex is set to auto ,once you hardcode it will kill that connection. If the device on the other end is a cisco device you can leave it as auto without a problem . Sounds like you are using a straight thru cable instead of a xover cable. Gig is full duplex anyway and I don't think you gain much by hardcoding a gig port .


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