40XLPPI

From the EX4300-48MP

SGMII:  Serial Gigabit Media Independent Interface    ( https://www.intel.com/content/www/us/en/programmable/solutions/technology/transceiver/protocols/pro-sgmii.html  )
XFI : 10Gbps(X) form Factor Interface
XLAUI : 40Gbps (XL) Attachment Unit Interface
XLPPI : 40Gbps (XL) Parallel Physical Interface

https://www.synopsys.com/designware-ip/technical-bulletin/demystifying-40-interfaces.html