Google's exact ToR (top of rack) switch code isn't available, but you can buy a switch from any number of network gear vendors (Arista, Cisco, Brocade, Juniper,

Google's exact ToR (top of rack) switch code isn't available, but you can buy a switch from any number of network gear vendors (Arista, Cisco, Brocade, Juniper, HP, etc), that can do VXLAN encapsulation and send the traffic over a leaf/spine network that covers thousands of racks.