Ethernet frames with an MTU exceeding 1500
Classic Ethernet allows for a Maximum Transmission unit of 1500. This was fine in the days where Ethernet was a shared 10mbit medium and where buffer space was expensive.
These days gigabit speeds are common, storage is cheaper and using larger frames can reduce overhead. Jumbo frames try to solve this by using a larger frame.
For this to work all devices need to support this frame size. Often this is 9k, but other frames sizes are also in use.
