How do I set a QSFP port on a FortiController 5903C to 4x10Gb mode?

[JoshTest]

I have a 5903C that I need to set a single port to 4x10Gb mode and use a breakout cable to connect back to some Brocades in an LACP truck.  I have been unable to find the commands, etc. to set this.  

Can anyone help?

[ToniSulo]

In fortigate 5001D it is done with commands:

Config system global
Set split-port port1
End

Not sure if this helps or not..

[JoshTest]

Hey Toni,

Thanks for offering to help.  I did find what I needed, although it was not what I wanted to hear.  Below is a summary for reference.

On a FortiController with 40Gb ports, you can place ALL ports in either 1x40Gb mode or 4x10Gb mode but you can NOT mix and match.  Its all or nothing.

To make this change on a FortiController, the commands are below:

config system global

set fabric-front-port-10g-mode enable

end