A virtual chassis represents a set of devices which share a common control plane. A common example of this is a stack of switches which are connected and configured to operate as a single managed device. Each device in the virtual chassis is referred to as a VC member, and assigned a position and (optionally) a priority. VC member devices commonly reside within the same rack, though this is not a requirement.
One of the member devices may be designated as the VC master: This device will typically be assigned a name, services, virtual interfaces, and other attributes related to managing the VC. If a VC master is defined, interfaces from all VC members are displayed when navigating to its device interfaces view. This does not include management-only interfaces belonging to other members.
It's important to recognize the distinction between a virtual chassis and a chassis-based device. A virtual chassis is not suitable for modeling a chassis-based switch with removable line cards (such as the Juniper EX9208), as its line cards are not physically autonomous devices. Instead, use modules for these.
The virtual chassis' name.
The domain assigned for VC member devices.
The member device which has been designated as the chassis master (optional).