According to the SuperMicro website, the chassis CSE-512F-280 and CSE-512F-520 are optimized for the X8DTL-3F motherboard. Can you please confirm if the I/O shield on the chassis has the provision for the dedicated IPMI port on X8DTL-3F motherboard?
I/O shield does support IPMI dedicate LAN, and it is a standard part of the motherboard.
"MCP-260-00027-0N 1 STD I/O SHIELD for X8, H8, X7SB3 SERVER MB (3RD LAN + 4XLAN)"