Previously, changing the MTU would require destroying the lagg and creating a new one. Now it is allowed to change the MTU of the lagg interface. The MTU of the ports will be set to match. If any port cannot set the new MTU, all ports are reverted to the original MTU of the lagg.
Additionally, when adding ports, the MTU of a port will be automatically set to the MTU of the lagg. As always, the MTU of the lagg is initially determined by the MTU of the first port added. If adding an interface as a port for some reason fails, that interface is reverted to its original MTU.