Hi!
The LS technology virtualizes a PS into multiple systems for independent management and service deployment, maximizing the utilization of hardware and software resources of the PS. Different LSs take different roles on the network to isolate faults and hardware and simplify the existing network. With the LS technology, network deployment functions that are implemented using multiple devices are now realized using only one PS, reducing the operation cost of service providers.
A VS is a system with simulated software and hardware. VSs share all resources, such as MBs, LCs, and chassis, not physical and logical interfaces. VSs can be working properly only after they are assigned slot and interface resources.