Technical Tip: Caveat for FortiGate 3400E and FortiGate 3600E SFP28 ports

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Description
This article describes a caveat about the use of the SFP28 ports of FortiGate 3400E and FortiGate 3600E.

Solution
Since there are 4 ports in one core of Broadcom chip, if one of these ports is set to 25GE, all the four ports within the group will also be changed to 25GE. In addition, the throughput will not be 100% when the frame size is between 64B and 109B if all ports are at max inputs.