During VMworld 2008 Cisco announced its virtual switch for ESX 4.0, called the Nexus 1000V, which is a a piece of software built on NX-OS, that plugs into ESX and that can be configured through the familiar Cisco command line interface.
The Nexus 1000V Series Switches contains several components:
- Virtual Ethernet Module (VEM), a software switch at the hypervisor level
- Virtual Supervisor Module (VSM), capable of managing network policies and Quality of Service (QoS) for VMs using the VEM.
- Virtual Security Gateway (VSG), provides multitenant access, with zone based security policies for VMs
- Virtual Wide Area Application Services (vWAAS), which is a WAN optimization solution.