Hello.
How to solve a excessive or late collision, link duplex mismatch in a port?
I have a ubiquiti acces point in there.
Thanks.
Then this Accesspoint is not set to Auto negoation
Try setting the ether1 speed manually (not Auto Negotiation) in Interfaces/Ethernet/(ether1)/Ethernet, and do the same at the other side at whatever is connected to ether1