3com 2924 Managed Switch


I have just installed a 3com switch, out of the box.
Plugged into our network, where we have approximately 10 PCs connected to a few 2k3 servers.
I have not set up anything on the switch as of yet, it came out of the box and replaced our older 24 port 10/100mbps switch.
Since I have replaced it, we are getting issues login into the domain.

I am getting errors in my event log saying that the domain controller cannot be found, yet if I plug the old switch back in, i don't get these errors.

I have implemented these in other clients offices and since we have had these problems I have checked a few client PCs at other offices and they are also getting the same errors using these switches.

Windows XP Pro pops up with a bubble after logging in, saying 'Could not reconnect network drives...'  - As implied, we do not see this error message after putting everyone back into our old switch.

What could be the issue here?
Anyone seen something like this before? I have always seen this switch marketted as 'out of the box configuration should work for everyone.' so to speak.

Suggestions appreciated!
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MarkMichaelConnect With a Mentor Author Commented:

It seems that (still under testing for the moment) that the out of box configuration is not the way for me, or many of my clients.
I called support and they told me to read the manual! (sigh) so this unit does indeed need some configuration out-of-the box on a totally default install.

Either way, the problem seems to be STP Spanning Tree Protocol. Turning that off has solved the issue. It seemed that it was affecting DHCP to a level not totally understandable to myself, but I have half a clue of what it was doing. So in escence, turning this off works fine. I know my switch is now subseptable to looping, but i have never had an issue in the past with this option defaulted to being off on any other of my switches.

Thanks for the help though..
suppose you have to ask your reseller for help or even ask 3com about the problem you have.
the switch should work just out of the box.
Sounds like DNS/NETBIOS traffic cannot get through. Out of the box that should work. Now are you using this as a managed switch? If not, some switches allow you to disable management. May want to try that to see if it then works.
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I suppose asker got answer to his question. 3 experts agreed that out of the box configuration should work without problem.
if Asker feels his q was misunderstood, he can clarify details here also.
i suppose asker's comment needed.
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First of all thanks for all the information that each one is sharing out. When I joined to this exchange few months ago, I never had a question that wasn't answered. I find it easy to resolve technical problems.

Here's my question, do I need to disable STP in all the 3com 2924 switches and which tab: Device>Spanning Tree>Setup>Global Settingsl>Spanning Tree State>Disable or
Device>Spanning Tree>Modify>STP>Disable

thanks a million!
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