Thanks, glasser. Yes, with 802.1q VLAN, all connected ports are continuously flashing because I have a torrent client running on a server on one port. The switch allowed ~25 Mbps download speed...

Model : TL-SG108e Hardware Version : 2.0 Firmware Version : 1.0.2 Build 20160526 Rel.34615 ISP : N/A On my unmanaged switch the status LEDs flash apparently only when there is activity on their port....