Auto Negotiation & Limit Highest Speed

Unanswered Question
Feb 13th, 2008
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Is it possible (& how, feature available?) to provide with auto-negotiation in a 10/100/1000-TX switching port environment a limitation to a-100 (FE) speed.

Reason: We want to provide auto negotiation, but avoid the possibility that a client workplace connects with GE (a-1000) speed.

Thanx for any ideas/inputs.


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glen.grant Wed, 02/13/2008 - 08:43
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Yes most of the newer IOS switches allow this , just set the ports as "speed auto 10 100 , this restricts it to either 10 or 100 whatever it negotiates , if you want 100 only just remove the 10 parameter.

r.manzardo Fri, 02/15/2008 - 05:15
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Hi Glen

You wrote: 'Yes most of the newer IOS switches allow this'

What does it mean exactly? Do you eventually have consistent informations about this issue? I've started google-ing on CCO, but it's not easy...

Is it possible to say something like 'on platform x since IOS release y this feature is available'?


Edison Ortiz Fri, 02/15/2008 - 06:47
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Please see:

Release 12.2(20)SE1

Support for the 10, 100, and 1000 keywords with the auto keyword was added.

Tip: When looking for a command, go to the documentation and pick a switch (I usually pick the 3560). Select the latest software release and then 'Switch Command Reference'.





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