Technical Tip: How to configure MTU jumbo frame size

scheehan_FTNT · ‎01-11-2024

Description

This article describes how to configure interface MTU with jumbo frame size.

Besides a normal Ethernet frame size of 1500, FortiADC supports an Ethernet jumbo frame size of 9000.

Jumbo frames are larger MTU frame sizes, potentially reducing overheads and CPU cycles and positive effect on point-to-point TCP performance with bigger payload size transmission.

All intermediate devices that transmit jumbo frames along the transmission path must support jumbo frames. Otherwise, the Ethernet frames will be discarded.

Scope

FortiADC.

Solution

Check system interface configuration:

Update system interface mtu option from 1500 to 9000.

config sys interface

edit port1

set mtu <integer> <----- Maximum transportation unit (68-9000).

end

Verify system interface mtu status after the change:

Note:

Discuss with the network team before implementing the jumbo frame configuration.