Both types of VMware vSphere virtual switches "vSS" & "vDS" let you control vSphere virtual machine (VM) traffic. (1) vSS: When you install ESXi, the default management port group is attached to the first vSphere Standard Switch that is created by the installation – vSwitch0. It'S used to provide network connectivity to hosts and virtual machines. No matter how many hosts you have running in your cluster, you will need to configure the same vSS for each host. For two or three ESXi hosts is ok but if you have hundreds of ESXi hosts to configure between multiple clusters, it can become very tedious.
(2) vDS: Is part of the vCenter Server, You will not be able to use the vSphere Distributed Switch if you are running standalone hosts. vDS is a single virtual switch across all ESXi hosts and allows virtual machines to keep consistent network configuration as they migrate across multiple hosts. vDS is only available as part of vSphere Enterprise plus licensing and it’s not created by default.
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