[Skunkworks] Auto Switching of Links and Aggregation

Hi Skunks, I work with a service/link provider. Most of the customers use two links terminated to our NOC provided by two providers. Mostly Fibre and serial. By default, we usually use fibre as default. We usually manual change the route if the main link has issue`s to the backup link i.e serial. All our customers are on cisco 1721 or 1841 series router. Am looking for a solution where it will be automatic. please assist. Edwin Ngige 0722 841853