Hi, please check these steps:  To troubleshoot the connectivity issue, you can follow these steps: If still the issue persists, it might be that the interface is not up because the SFP module is not qualified by the server. 
I installed 100G SFP to 100G SFP(Not Dell SFP) point to point in Z9264F-ON, the interfaces and LEDs are not up  when I checked the interface inventory, is displaying "Qualified"-->"False"  interface ethernet1/1/1no shutdownno switchportmtu 9192ip address XX.XX.XX.XX/31flowcontrol receive offs System Inventory Media-----------------------------------------------------------------------------------------------------------------Node/Slot/Port Form-Factor Media Serial-Number Qualified-----------------------------------------------------------------------------------------------------------------1/1/1 QSFP28 QSFP28 100GBASE-SR4 X98BQ7G false show ip interface briefInterface Name IP-Address OK Method Status Protocol=========================================================================================Ethernet 1/1/1 10.67.0.0/31 NO manual up downCould you guys tell me that what the configuration is not enough?
Not only 100G QSFP28 interface not up but also not LED in Z9264F-ON