From: Capt.Spock (capt.spock@gmail.com)
Date: Fri Nov 18 2005 - 15:51:00 GMT-3
Thanks James! That fixed it!
These switches are going to be trunking production switches. After reading
some articles I have changed them manual values instead of AUTO. Now you are
suggesting them to be AUTO.
Thanks!
On 11/18/05, James Ventre <messageboard@ventrefamily.com> wrote:
>
> Gigabit negotiatio avoids the negotiation problem 10/100 networks had of
> hardcoding one side. If you hard code one side of a gig link - the
> other side will stay down/down. Gig negotiation is a good thing - you
> really shouldn't disable it since it also controls things like flow
> control!
>
>
> Your case is a bit different - cause you're hardcoding both sides. What
> is probably happening is that you're losing your MDIX auto functionality
> (auto crossover cable) by hardcoding the line speed.
>
>
>
http://www.cisco.com/univercd/cc/td/doc/product/lan/cat2970/12119ea1/2970scg/
swint.htm#wp1193977
>
> When you enable Auto-MDIX, you must also set the speed and duplex on the
> interface to auto in order for the feature to operate correctly.
> Auto-MDIX is supported on all 10/100/1000 Mbps interfaces and on
> 10/100/1000 BASE-T/TX SFP interfaces. It is not supported on 1000
> BASE-SX or -LX SFP interfaces.
>
>
> James
>
>
>
>
> Capt.Spock wrote:
> > I have couple of 2970 switches connecting to a mix of other switches
> like
> > 2970,6500,etc
> > Some GIG connections are down if I set FULL 1000 on both the sides but
> come
> > up when I do AUTO AUTO on both the sides. They come up with FULL and
> 1000!!!
> > These are between 2970 (same breed)
> > What makes the connection to go down when the DUPLEX and SPEED are set
> > manually instead of AUTO??
> > Any info is appreciated!
> >
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