Hello,

I have problems to build up a reproducable fast Gigabit connection via cascaded TP-Link switches.

Speed tests are done by copying a 1GB file in Windows environment.

Target
Router - TL-SG1024DE  - TL-SG108E - PC1
                                       |- PC2
copy 1GB File PC1->PC2: ~2 MB/sec

Intermediate solution by connecting PC1 and PC2 directly on TL-SG108E works in my opinion fine
Router - TL-SG1024DE  - TL-SG108E - PC1
                                                             |- PC2
copy 1GB File PC1->PC2: ~70 MB/sec

Back to Target by connecting PC2 again to TL-SG1024DE works surprisingly also fine
Router - TL-SG1024DE  - TL-SG108E - PC1
                                       |- PC2
copy 1GB File PC1->PC2 ~70 MB/sec

BUT

TL-SG108E power off/on leads again to slow speeds ~2 MB/sec

I have already tried restarts and factory resets of both switches as well as different cables without success .
Switches show always Gigabit connection and cable test says ok.

Environment:

• Router: FRITZ!Box 7590, Fritz!OS 07.12, 192.168.1.1
• TL-SG1024DE: 1.0.1 Build 20180629 Rel.58591, TL-SG1024DE 3.0, 192.168.1.22
• TL-SG108E: 1.0.0 Build 20180720 Rel.62134, TL-SG108E 4.0, 192.168.1.24
• PC1: Network Realtek PCIe GBE, Win10, 192.168.1.40, JumboFrames deactivated
• PC2: Network Realtek PCIe GBE, Win7, 192.168.1.44, JumboFrames deactivated

Thanks for useful hints

Andy