A distributed virtual switch is an abstract representation of multiple hosts defining the same name, network policy and port group.
The representation, which illustrates the concept of a virtual machine (VM) remaining connected to the same network folder as it migrates among multiple hosts, allows basic configuration details to be pushed across a cluster. This helps to eliminate common configuration errors.
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VMware developed the concept of a distributed virtual switch, a virtual switch (vSwitch) that extends its ports and management across all servers in a cluster so the network can be managed from a centralized perspective.