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Источник: https://community.fortinet.com/t5/Forti ... a-p/192636

Technical Note : How to adjust the Maximum Transmission Unit (MTU) value on a FortiGate interface

MTU definition : The largest physical packet size, measured in bytes, that a network can transmit. Any packets larger than the MTU are divided into smaller packets before they are sent. The default MTU is 1500 on a FortiGate interface.

To change the MTU on a given interface from the GUI proceed as follows :
Go to System> Network> Interface.
Select the Edit icon for the interface.
Select Override default MTU value (1500).
Enter the new MTU value.
Click OK.

To change the value from the CLI (example on an AMC module - NP2) :

config system interface
    edit "amc-sw1/2"
        set vdom "root"
        set mtu-override enable
        set mtu 9000
    next
end

See also the related article "Technical Note : Jumbo frames support on FortiGate devices"