I have a navbar with two links:
<a ng-link="['Route1']">Route 1</a>
<a ng-link="['Route2']">Route 2</a>
Angular 1 Component Router automatically adds the
ng-link-active class to active
If your version isn't adding this automatically, you are probably using an outdated version of the Component Router. I've been using this version which is a more recent compilation rather than the one stated on the docs (which is 0.2.0).
Let's hope they get it production-ready soon.