This MIB module defines the managed objects that support the virtual switch architecture. The virtual switch concept combines several individual distributed physical switches together to build a single logical management point. The core switches are the control point for a virtual switch, all the traffic is forwarded and distributed in the core switches, including control and data traffic. The core switches are connected through a dedicated ether channel called Virtual Switch Link (VSL) that is used for both control traffic as well as some data traffic to provide the traffic load sharing and switch redundancy between the physical chassis. One or multiple core switches can be supported in the virtual switch architecture, but only one core called 'active core' switch can be active to manage the traffic. The other is called 'standby core' switch as redundancy if there is. The concept of virtual switch is to collect many physical switches chassis together to form a single management unit to simplify the whole network architecture.