The IP SLA config will have on route being preferred. Both links will be active but if you query your routing table you should see the route.   You can use show ip route & show ip route track-table to verify.  Also note you have the option to do NAT ...

Definitely recommend the Team Cymru link sent by Harold. Please email me at brentmc7@gmail.com if you wish to get a few samples used  in some of our deployments. You can make adjustments where needed. Will also be great to get some details on the  Ro...