There are a lot of choices to be made for networking in VMware vSphere 5. We’ve got the good ol’ vSwith, vSphere Distributed Switch (vDS) and finally the Nexus 1000V from Cisco. But what is the best one?
vSwitch (vSphere standard switch)
A vSphere standard switch is a virtual switch that can be created on a single host. Port groups defined on this vSwitch will be local to the host on which the port group is created. In other words: If you have multiple hosts you have make sure that the port groups are identical across all hosts, especially when you want to use vmotion. For VMotion the port group names on the source and target host have to be the same.