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From: Keith Medcalf (no email)
Date: Thu Dec 10 2009 - 21:16:57 EST
> Autoneg is a required part of the gig E specification so you'd only be
> causing yourself trouble by turning it off. (I don't know if
> it'll also break automatic MDI/MDI-X (crossover) configuration, for
> an example of something that's nice to have.)
At least on 450x series enhanced linecards, disabling autonegotiation disables auto MDI/MDI-X. You have to enable autonegotiation but you can provide specified offered and acceptable parameters, eg: "speed auto 100" to enable autonegotiation but only allow negotiation of 100 mb. (speed auto 10 100 / speed auto 1000 / etc)
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