(The command line interface of the QuidwayAR28 series routers provides a wealth of configuration commands. Under the system view, in order to facilitate users to manage the router, comprehensive commands are grouped, each group corresponds to a view (see "VRP3.4 Operation Manual" for details), you can Switch between different views with commands. Normally, only limited commands can be executed in a certain view, but some common commands (such as ping, displaycurre)