BXI is the interconnect developed by Eviden for their BullSequana line of supercomputers. It started out as a hardware implementation of Portals.
BXI v3
BXI v3 is an Ethernet-based protocol much in the same way that Slingshot is Ethernet-based.1
From The Next Platform: 1
BXI v3 will ship in 2025, and Eppe says that many of the features that will eventually be in the UEC specification
It is being developed under the NET4EXA Project,2 a €71M effort sponsored by EuroHPC-JU through 2027 and managed by CEA.
Switch
The BXI v3 switch uses a 64-port 800G ASIC which can be broken out into 128 ports of 400G.1
NIC
BXI v3 will be implemented as an FGPA-based SmartNIC with a 400G serdes.1