On a traditional router, if a service on an IPU is faulty, the associated device may also get faulty, interrupting other services. The virtual system (VS) technique can be used to differentiate and isolate services. After VSs are applied on a router, if a fault occurs on a VS, other services transmitted on other VSs are not affected. This mechanism improves network security.
As shown in Figure 1, different VSs on the same physical router carry different services. Video, voice, and data services run on three independent VSs.