Nexus 1000v Virtual Ethernet Module
The Cisco Nexus 1000V Virtual Ethernet Module (VEM) executes as part of the VMware ESX or ESXi kernel and replaces the VMware Virtual Switch functionality. The VEM leverages the VMware vNetwork Distributed Switch (vDS) API, which was developed jointly by Cisco and VMware, to provide advanced networking capability to virtual machines.
Nexus 1000v Virtaul Supervisor Module
The Cisco Nexus 1000V Series Virtual Supervisor Module (VSM) controls multiple VEMs as one logical modular switch. Instead of physical line card modules, the VSM supports multiple VEMs running in software inside of the physical servers. Configuration is performed through the VSM and is automatically propagated to the VEMs. Instead of configuring soft switches inside the hypervisor on a host- by- host basis, administrators can define configurations for immediate use on all VEMs being managed by the Virtual Supervisor Module from a single interface.
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