A physical rack contains two top of rack (ToR) switches, each of which has 48 10GE ports and at least 4 40GE uplink ports. The ToR and spine switches carry all network traffic from the servers including VM network, VM management, vSAN, and vMotion traffic. On rack 1 in a multi-rack Cloud Foundation, the ToRs also carry traffic to the enterprise network via two of the uplink ports. The ToR switches provide higher bandwidth as well as redundancy for continued operation in case one of the ToR switches goes down.
If the installation has spine switches, two uplink ports from each ToR switch on each rack are connected to each spine switch.