Hello,> What happens without using LAGGNothing, unfortunately.I've also seen some errors on my NICs :<5>ix1: link state changed to DOWN<5>ix0: link state changed to DOWN<5>lagg0: link state changed to DOWN<5>lagg0_vlan20: link state changed to DOWN<5>lagg0_vlan40: link state changed to DOWN<5>ix0: link state changed to UP<5>lagg0: link state changed to UP<5>lagg0_vlan20: link state changed to UP<5>lagg0_vlan40: link state changed to UP<5>ix0: link state changed to DOWN<5>lagg0: link state changed to DOWN<5>lagg0_vlan20: link state changed to DOWN<5>lagg0_vlan40: link state changed to DOWN<5>ix0: link state changed to UP<5>lagg0: link state changed to UP<5>lagg0_vlan20: link state changed to UP<5>lagg0_vlan40: link state changed to UPNow, I've tested without LACP on my switches and shutdown one of my switch port to test if the LACP can be the problem.And even if I have no more flaps on my NIC, my bandwidth still stay to 4Gb/s, almost 5Gb/s without NAT.