On Sun, Apr 5, 2020 at 10:52 PM Saku Ytti <saku@ytti.fi> wrote:
The only thing that is larger in your network is hellos, and I'm not
even sure how that works, considering 802.3 cannot signal larger
frames than 1500B.

Probably this method: 
https://en.wikipedia.org/wiki/EtherType#Jumbo_frames