[c-nsp] Windows server hangs connected to 3750

[Tony]

Damien,

What sort of troubleshooting have you done thus far ?

Some questions/suggestions:

* check to make sure MAC addresses on the servers aren't the same. Sounds strange but I've had it before (from a reputable vendor whose name is abbreviated to 3 letters).
* hard code both switch & server to 1000/full to make sure you're not getting speed/duplex mismatches.
* does the problem continue to happen when ONLY the servers are connected to the switch (ie. isolated from rest of the network) ?
* try new GBICs to check they aren't bad. Swap the ones that aren't working for some that are known to work (you mentioned you have some switches/servers that are working).
* change the NIC in the server. You're probably using the onboard NIC's so this would mean adding a PCI Gb NIC to a server to test.
* move one of your servers that IS working to the same switchport that isn't working with these new servers. This will pretty much rule out the switch (provided that it continues to work) and you can start looking at the servers harder.
* does it happen immediately (ie. as soon as you connect the servers) or does it takes minutes/hours for the problem to show up ?
* have you got anything fancy configured on the switch ?
* To attempt to see if it's a software issue you could boot up a live linux distro (eg. knoppix) and see if it has the same problems with the Gb cards/switch. If that works fine, then a reinstall of Windows might be called for and following that up with MS tech support if problem still occurs.
* I think someone else already asked if you're doing anything fancy like clustering or load sharing/balancing ?



regards,
Tony.

--- On Wed, 26/11/08, Vigar, Damien <Damien.Vigar at det.nsw.edu.au> wrote:

> From: Vigar, Damien <Damien.Vigar at det.nsw.edu.au>
> Subject: [c-nsp] Windows server hangs connected to 3750
> To: "cisco-nsp at puck.nether.net" <cisco-nsp at puck.nether.net>
> Date: Wednesday, 26 November, 2008, 4:17 PM
> Hi all,
> 
> We are experiencing an issue with Windows 2003R2 servers
> connected to our 3560/3750 switches via a 1000T SFP GBIC.
> The servers appear to hang, responding to a ping but not to
> anything else. It looks to us like an issue with the
> servers, but our server administrator insists that it must
> be the GBIC/switch combination.
> 
> We've put the servers in question back onto fast
> ethernet ports, and haven't seen any problems in the
> meantime. Other sites' servers are running fine on the
> same GBIC/switch combination.
> 
> We've tried to find anything relating to this issue
> online, with no luck. Any ideas on where to go next?
> 
> 
> Cheers,
> 
> Damien
> 
>