-We love the existing network stack in Linux. It is robust, flexible,
-and feature rich. Linux already contains an in-kernel L2 switch (the
-Linux bridge) which can be used by VMs for inter-VM communication. So,
-it is reasonable to ask why there is a need for a new network switch.
+Hypervisors need the ability to bridge traffic between VMs and with the
+outside world. On Linux-based hypervisors, this used to mean using the
+built-in L2 switch (the Linux bridge), which is fast and reliable. So,
+it is reasonable to ask why Open vSwitch is used.