IP-switching developed by Ipsilon Networks, Inc. it was the first version of the label-switching. In this architecture, the road is determined by the IP flow. IP-switch nodes replace the routers is working in router mode to trace the path with the first IP packet flow, or by ATM cell switching mode, for all the cells which follow the route path. The first IP packet is routed normally, such as an Internet network. The route is determined by an Internet routing algorithm.