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Date: Tue, 26 Dec 2006 18:36:43 -0500
From: Gary Palmer <gpalmer@freebsd.org>
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Subject: Re: trunk on re0 interface
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On Tue, Dec 26, 2006 at 06:20:28PM +0100, Sylvie DUPUY wrote:
> Hi,
> 
> I got a FreeBSD (6.1) connected to a Cisco switch 2950 (12.1).
> The speed on the re0 interface is 100 Mbps full duplex but when it get
> connected to the Cisco it turns out 10baseT half-duplex ?

If you have the re0 locked at 100 full duplex, you implicitly turn off
autonegotiation and the other end of the link doesn't know what to do.
Either use autonegotiation on both ends, or fix the speed and duplex on 
both ends.