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.