R750's 2.5G ethernet port not working

[houston_rocket]

The 2.5G POE port is plugged on Zyxel XS1930-12HP switch. The switch supports 1G/2.5G/5G/10G, and POE++. The problem is that it is unable to negotiate with the switch at 2.5G speed. I already tried to set the switch port to auto-negotiation or force 2.5G, neither works properly. The only way to work is to set force 1G on the switch port.  It seems  a compatibility problem. Is it possible to set force 2.5G on AP?  "set ethspeed" doesn't work.

[christopher_cal]

I only ask as we are having a similar issue with the same model, but we have 80 APs working and negotiating fine, but 2-4 are not.

[houston_rocket]

none of my APs are working properly, only working on 1G

[eizens_putnins]

In this case you need to open support case with both vendors to find out the reason...

[houston_rocket]

They don't have devices to test, so I want to test force 2.5G on AP. Anyone knows a command to set force 2.5G on AP?