[c-nsp] The myths of autonegotiate vs forced

Mikael Abrahamsson swmike at swm.pp.se
Fri Aug 20 04:18:34 EDT 2010


On Fri, 20 Aug 2010, Peter Rathlev wrote:

> On Fri, 2010-08-20 at 09:34 +0200, Mikael Abrahamsson wrote:
>> In case of having to force, do use "speed auto / duplex full" if your
>> equipment supports it.
>
> And on a side note, if one needs to provide less-than-linerate speeds
> (e.g. a 100 Mbps customer on a gigabit interface) it's much better to
> use "speed auto 100" than "speed 100". Not all devices/modules support
> it (by far), but it will give you the benefits of autonegotiate while
> still "locking" the interface at a lower speed.
>
> The 3560G supports it, most 6500 modules seem not to AFAICT. Let's see
> if 100 Mbps disappears before this will be generally implemented.

I feature requested this (why stop doing autoneg just because you select a 
single speed/duplex, there is no downside to still announcing your 
capabilities), the response back was the usual "you're the only one asking 
for this"-answer.

-- 
Mikael Abrahamsson    email: swmike at swm.pp.se


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