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How do I change network speed on switched environment

I know it sounds easy enough, change the adapter speed to 1Gbps, I try this and then the conenction drops. We are running a Dell 48 port and two other Dell 48 ports that span off that main switch.

Some users can hit Gig E and some are stuck at 100Mbps.

What do I need to do to resolve this and enable high speed computing ont he network for everyone?

Thank you

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3 Solutions
Are you using fixed settings? Different duplex settings will result in a mismatch and different speed settings will not allow a network link to come up at all.
Is there a problem with having switch ports and adapters set to auto-negotiate? Gig etherent should support 10/100/1000 and will allow a device to connect at whatever it is capable of.
manelson05Author Commented:
I have been trying to fin dhte auto negotiate setting as I thought that woul allow the actual computer to select the speed I cant seem to locate this on the switch. The switch is a DELL Powerconnect 6248P. This is what I see when I log in as ADMIN.
manelson05Author Commented:
My understanding is that the previous person who they outsourced IT too tried to keep all users at 100mbps on the lan and allowed only a select few gigabit access, I want any user who can achieve gigabit speed to have it, really want auto negotiate. Enabled.

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The autonegotiation can be configured to offer 10h, 10f, 100h, 100f and 1000f.

From the CLI, this can be accomplished with the negotiation command.


negotiation 10h 10f 100h 100f 1000f


I guess the previous administrator set the ports not to offer 1000f.
Looking through the manual for the GUI, you find the port configuration by following:
Switching, Ports, Port Configuration
For each of the user ports you want Auto Negotiation enabled and for Admin Advertisement have Max Capacity selected.

I suggest if you do this that you should look at the usage of the link back to the main switch. You may for example, decide to have at least a couple of 1Gb connections link aggregated back to the main switch to handle all the traffic.
manelson05Author Commented:
Wrong switches were ordered I just found out after inspecting they are being RMAd for Gig e swtiches.

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