root cause. Deco adopts the IEEE 1905.1 standard protocol to create the Ethernet Backhaul network. When Ethernet backhaul is working, Deco will disconnect the Wi-Fi backhaul to avoid the network loop issue.
However, we find that some D-Link switches won’t forward the IEEE 1905.1 packets, causing that both Ethernet and wireless connections between Decos are working at the same time, which resulting in a network loop, causing the whole Deco system becomes unstable.
We already tested with switches of some other brands (unmanaged or managed), all work fine except some of the D-Link switches. Even some D-Link managed switches are working fine by forwarding the IEEE 1905.1 packets as expected.
Regarding this case, we recommend to contact D-Link support for a solution. Or change another switch such as TP-Link unmanaged switch which is confirmed working with Deco Ethernet Backhaul connection.
Here is the reference link for TP-Link switches: https://www.tp-link.com/us/business-networking/switches/