Troubleshooting Tip: Speed option for 100Gauto is not available on QSFP28 ports of FortiGate 2600F series devices

100G auto-negotiation speed is missing on ports 33-36 of the FortiGate 2600F series.

show system interface port33

config system interface

    edit "port33"

        set vdom "root"

        set type physical

        set mediatype cr4

        set snmp-index 33

        set forward-error-correction cl91-rs-fec

        set speed 100Gfull

    next

end

config system interface

    edit port33

        set speed
        40000full 40G full-duplex.
        100Gfull 100G full-duplex.

This issue has been resolved in FortiOS versions 7.2.9, 7.4.4, and 7.6.0.

set speed
40000full 40G full-duplex.
40000auto 40G auto-negotiation.
100Gfull 100G full-duplex.
100Gauto 100G auto-negotiation.