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Overview of VSs
Definition
Virtual system (VS) technology virtualizes a single physical system (PS) into multiple logical systems that are independent of each other. Each VS functions like an individual physical device to process services, as shown in Figure 2-1.
Purpose
As the network scale expands, more network infrastructure devices are required. However, some of the devices are not fully utilized, which causes a waste of resources.
VS technology allows a PS to function as multiple physical network nodes, which makes full use of existing resources and reduces the operating expenditure (OPEX). Different VSs have different services deployed to isolate services and faults, which improves network security and reliability.