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Network communications between virtual machines that are connected to the same virtual network on the same ESXi host will not use the physical network. All of the network traffic between the virtual machines will remain on the host.
Keeping virtual machines that communicate with each other together on the same host will reduce the load on the physical network; for example, keeping a web frontend server, application server, and database server together on the same host will keep the traffic between the servers internal to the host.
If the VMware DRS is configured on a vSphere Cluster, DRS rules can be configured on the cluster to keep virtual machines together on the same host.
In the following screenshot, a Virtual Machine ...
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