(Dynagen is a text control system based on Dynamips It uses "hypervisor" super monitoring mode to communicate with Dynamips Net file describes the network topology Dynamips features: easy to use, easy to understand the configuration file, and simple interconnection between routers, bridges, ATM, FR, and switches Provides cli management, which can list devices, start, stop, restart, suspend, recover, and connect to the console port of the virtual router)