I have two XSM4348 switches with a 3 port 10g fiber LAG between them. I need to set Jumbo frames on the LAG to accommodate video streams to visionary decoders but occasionally the LAG will revert to the standard 1500 MTU setting causing fragmentation of the video stream. When I reset the frames to 9198 the stream is resolved but then inevitably the frame size resets again. What could be causing this? The other traffic sharing the LAG includes control, Dante, QLAN, KVM, and comms but only the Visionary devices appear affected by this change.
