Angular routerLink does not navigate to the corresponding component

My routing in the angular2 apps works well. But I am going to make some routeLink based on this: Here is my routing:

const routes: RouterConfig = [
    { path:'home' , component: FormComponent  },
    { path:'about', component: AboutComponent },
    { path:'**'   , component: FormComponent  }
];

And here are the links that I made:

<ul class="nav navbar-nav item">
  <li>
    <a routerLink='/home' routerLinkActive="active">Home</a>
  </li>
  <li>
    <a routerLink='/about' routerLinkActive="active">About this</a>
  </li>
</ul>

I expect that, when I click on them it navigates to the corresponding component, but they do not perform anything?