04-22-2007 09:36 PM - edited 03-05-2019 03:36 PM
i have some new computer with intel network card Intel(R) 82566DC Gigabit Network and some time i get this message
Intel(R) 82566DC Gigabit Network Connection :Spanning Tree Protocol has been detected on the device your network connection is attached to.
and they disconnect and connnet from the lan i have cisco 3500xl stp is enable
04-22-2007 09:45 PM
Any changez has been made recently on the network(physically or made any changez in the config), because that might occur loop on the network.
05-31-2007 06:23 AM
Hello,
I Have also a BIG Problem with HP SFF PC's with Intel 82566 Gigabit Network Cards (OnBoard) with the same message.
My Problem is also a DISCONNECT (Layer1 LINK DOWN) and followed by a CONNECT (Link UP) after 1 Second.
My Switches are all 3500XL - With 3550 No Problem.
Configured PORTFAST and AUTO Negotiation
Fix Speed SET - No Change
PORTFAST DISABLE - No Change
Sometimes it helps when i change the Port or Patch to another Switch in the same Cabinet.
Please HELP - About 800 PC's (with about 20 with this Problem)
mgatterer
05-31-2007 09:48 AM
We're running into very simliar problems.
You have Portfast disabled on ports connecting to switches or routers right?
are there updated drivers for the nics?
05-31-2007 11:00 PM
I have portfast enabled.
But it doesn't make sense if i disable it.
NIC Driver Update to 9.8.20 (Latest) doesn't help...
06-01-2007 02:18 AM
Have you tried setting the ports to "access" or "host"? This will stop the port from trunking.
06-01-2007 02:34 AM
I use "switchport access vlan xxx"
I don't use TRUNKING at HOST ports.
06-04-2007 07:25 AM
I suspect that your Computer NIC supports trunking. I believe that the default trunk configuration on the 3550 switch is "dynamic desirable", therefore if the NIC tries to setup a trunk the switch will comply.
If you run the command "switchport mode access" on the swith interface, it will rule this out as a possibility.
You might also want to run "no switchport nonegotiate" to turn off Dynamic Trunking Protocol (DTP)
12-13-2007 11:11 AM
Hi,
Just wondering if anybody came up with anything further regarding this issue?
Thanks,
Craig
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