I ran into this problem this morning, but didn't know why. Have anybody seen anything similar?
I put in a WAVE-274 in between a switch and a router. The switch port is FastEthernet. The router port is GigE port but was set to 100 full. The WAE inlinegroup 1/1 was set to autosense.
The WAE registered with CM but CM was showing its inline 1/1/wan port in half-duplex. I thought changing autosense to 100 full might fix it. So I did this:
interface inlinegroup 1/1
Then I lost network connectivity to WAE and the router. I had to remove WAE from network to get connectivity back.
Did I do it right when changing autosense? should I change "inlineport 1/1/wan" to 100 full or change "inlinegroup 1/1" to 100 full?
I came across this with another device - disabling auto-sense also disables auto-MDIX. You'll need to put in a cross-over cable between your router and wave-274.