Configuration Guide User guide

606 FastIron Configuration Guide
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Jumbo frame support
Jumbo frame support
Ethernet traffic moves in units called frames. The maximum size of frames is called the Maximum
Transmission Unit (MTU). When a network device receives a frame larger than its MTU, the data is
either fragmented or dropped. Historically, Ethernet has a maximum frame size of 1500 bytes, so
most devices use 1500 as their default MTU.
Jumbo frames are Ethernet frames with more than 1,500 bytes MTU. Conventionally, jumbo
frames can carry up to 9,000 bytes MTU. Brocade FastIron devices support Layer 2 jumbo frames
on 10/100, 100/100/1000, and 10GbE ports.