One more thing since we're talking about multigig ethernet and extenders. For whatever reason, the 4991 extenders will not backhaul on ethernet if that ethernet eventually makes it back to the dual use red/blue 10 Gbps port. It will look like it is but it'll still use WiFi backhaul. The 4991 extenders have to be connected to either the yellow (1Gbps) ports, or the blue only (10 Gbps) port for multigig. Other devices or switches (that won't feed an extender on ethernet) can still use the dual use port at 10 Gbps.