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HP Probook 6550d NIC conflicts with HP Procurve 10/100 unmanaged switch?

Posted on 2011-02-17
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Last Modified: 2012-05-11
Hello. I have a client who has an HP Probook 6550d that has a NIC that seems to be in conflict with an unmanaged HP Procurve 10/100 switch. The place of business is on a single network and is using two unmanaged switches. When the laptop is connected to one switch the NIC will not stay connected. The link light flashes on and off on the switch and the NIC. The laptop is running Windows 7 Professional 32bit and shows the NIC connecting and disconnecting. When the laptop is patched to the other switch it works just fine...it doesn't disconnect. This laptop has an Intel 82577LC Gigabit NIC.

This laptop is two months old. It worked just fine up until this week. The client is using Cat 5e patch cables. I have tried using different patch cables and have tried updating the NIC driver. I did find that setting the NIC for 10 mbs full duplex seemed to help but did not last. Any ideas?  
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Question by:NCTERW
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Expert Comment

by:Bozos22
ID: 34922594
I would first change the setting from 10 mbps back to Auto if you haven't already done so.

Connect the laptop to the switch that keeps disconnecting and find out what the IP address is.
Next go to a command prompt and type...
nbtstat -a <IP Address>

where <IP Address> is the IP address of the laptop you connected.
This will list the NetBIOS Remote Machine Name Table.
Under the Name column, you should see the name of your laptop.
If you don't see your computer name, than there may be an IP conflict.

If you are using DHCP, you can try to release and renew the IP address at the command prompt.
The command to use is...
ipconfig /release
ipconfig /renew
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LVL 120
ID: 34922600
the network port is "flapping", it could be a mismatched duplex setting on the switch or laptop.

change both laptop and switch to full duplex.
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by:NCTERW
ID: 34974749
Thank you everyone for your input. I apologize for leaving this message unattended the last few days. The card and switch are both set to auto negotiate. I have tried a release and renew on the laptop and also checked DNS and DHCP records. This laptop is the only device associated with it's current ip address. The laptop worked just fine for an afternoon. The next morning the laptop was not connecting again and other users were also complaining of getting disconnected. Today I have put another switch in place and I haven't heard any complaints yet. The original laptop having the problem is out of the office for a few days. I will post another comment when I can test the laptop again.
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NCTERW earned 0 total points
ID: 35218792
I just wanted to reort that replacing the switch took care of the problem. Thank you everyone for your help.
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by:Qlemo
ID: 35439141
This question has been classified as abandoned and is closed as part of the Cleanup Program. See the recommendation for more details.
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