What is Virtual Switching


Multiple VMs must share a single network physical port such as a network interface controller (NIC).  The available options are

  1. Use PCIe single-root IO virtualization (SR-IOV) 
  2. Hypervisor to implement a vSwitch in software. 









vsphere distributed switch

VMware provides a virtual switching capability with their vSphere (ESXi) hypervisor. They call this a vSphere Distributed Switch (VDS) and it allows the extension of the vSwitch domain across multiple host servers.  Data physically moves between servers through the external network, but the control plane abstracts this movement to look like one large VDS spanning multiple servers. Each VDS can manage up to 500 hosts (servers). With VDS, the data does not move through a parent partition but logically connects directly to the network interface through local vNICs associated with each VM. The logical vNIC to physical NIC command and data translations are performed by the vSwitch

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