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Why the STP can reduce performance on teaming?


I made a teaming configuration with 2 NICs on motherboard under Windows 7.

I set them as Static Link Aggregation and also configure a network switch.

And I found that the network connection bandwidth became 2G on the Taskmanager as I desired.

But, when I made a switch test configuration test on the Windows, I found a message such like this.

"Spanning Tree Protocol has been detected on the network. If you want increase the network performance, You have to disable STP on the switch ports"

(I'm using foreign language version of Windows, So, It's not exactly same as display But same meaning)

My question is why STP can reduce the performance of teaming network?

And, I expected that I can see the 2Gbps of bandwidth during copy a file via network.

But, I couldn't see the bandwidth over than 1~1.2Gbps. Is this also related with this issue?

Waiting your advices.


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2 Replies
Community Manager

Hi EQMaker,

Thank you for posting in Wired Communities. . The STP is the protocol configured on the switch to prevent looping in the network. STP has some default timers when adds up will have a total of 30 to 50 seconds, thus when STP is enabled, this additional s of convergence time might adds overhead in network performance. You may also refer to page 52 of our Teaming user guide at


As stated therein "Spanning tree protocol should be disabled on switch ports connected to teamed adapters in order to prevent data loss when the primary adapter is returned to service (failback)."

By the way, may I know what is the motherboard and NIC model. As this is a configuration on the switch, you may contact your switch vendor for further clarification or more information. Thank you.



Community Manager

Hi EQMaker,



Please feel free to update me if you still have other inquiries. Looking forward to your reply.