Only you need to add other parameter in your route, the parameter is useAsDefault:true. For example, if you want the DashboardComponent as default you need to do this:
@RouteConfig([
{ path: '/Dashboard', component: DashboardComponent , useAsDefault:true},
.
.
.
])
I recomend you to add names to your routes.
{ path: '/Dashboard',name:'Dashboard', component: DashboardComponent , useAsDefault:true}