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Domain logins very slow on two different servers in two different domains on the same switch

Posted on 2007-08-11
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At our colo facility we have a network built on a Dell PowerConnect 5324 switch.  We have 4 different networks, all segmented via 802.11Q VLAN's  We installed a new server (2003 R2 SP2 Std) not too long ago and the domain logins were taking forever, as well as browsing to the SYSVOL.  We got Microsoft involved but they cant seeem to crack it.  Now this past week I installed another new server, (2003 Web SP2) on the same switch but different VLAN and it is exibiting the exact same behaviour.  I am not sure if it is coincidentally a Windows issue or if there is something wrong with the switch.

Any help would be greatly appreciated!
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Question by:innotionent
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by:tigermatt
ID: 19675985
If you're seeing it on many different setups on the same switch then I would assume that the switch is the problem. Try changing it out for a different one and see if that makes a difference.
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by:innotionent
ID: 19676151
There are 15 servers on this switch and only two have the issue, so I dont think the switch itself is bad, we are going to try different ports, but for now everything seems ok with the overall health of the switch
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by:KCTS
ID: 19676272
Make sure that the machines are configured with the address the DNS server which is authratitive for their own domain (usually their own Domain Controller) as their preferred DNS server.
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by:innotionent
ID: 19676821
Yup, got that covered as well, in fact when you register DNS it all upgrades.  The one thing that they also both have in common is you cannot ping the DC from the server with a packet bigger than 1468 bytes.
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by:innotionent
ID: 19679437
I went through and tested every server attached to the switch, and these two servers in question are the only two with BroadCom NetXtreme NICS, all of the rest have Pro/1000 and one has a NetXtreme II.  One of the servers has the most up to date driver from BroadCom, the other has the driver that installed from Microsoft by default, both have the same resulsts.  Is it possible for a NIC to be incompatible with a switch on the hardware level?  I see that there is a new software release out for the switch (Dell PowerConnect 5324) but I am hesitant to upgrade it at this point and knock out the other 13 servers.  I have ordered 2 new Intel Pro/1000 PT PCI e server NIC's, hopefully that will fix the issue.
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by:tigermatt
ID: 19679605
I've never heard of a network card having a conflict with a switch at the physical layer, they should all be built to the same specifications so even if they're different manufacturers they should still be able to talk to each other, a bit like wireless and 802.11a/b/g/n.
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by:innotionent
ID: 19748650
Ditching the integrated broadcom NIC and using Intel Pro/1000 NIC's fixes the issue, on all except for the servers that have no space for them for the riser cards, so I am still stuck.  Dell is telling me that there may in fact be a physical incompatability between the two devices, ironically both from Dell, whoda thunk it!
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innotionent earned 0 total points
ID: 19921269
It turns out there was a firmware upgrade for the broadcom NIC's, after apply these firmware upgrades AND switching the VLAN trunking mode from general to access everything started working just fine.

Adminsitrator, can this now be closed?
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by:tigermatt
ID: 19921891
You need to post a 0 point question at http://Community_Support/General/ requesting this question is PAQ'ed with points refunded since you answered it yourself, so putting it in the PAQ means someoe else may be able to find it in future if they have the same issue.

-tigermatt
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by:tigermatt
ID: 19921897
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