Are you using the backup interface feature? How are your devices connected? Could you provide a diagram? Why does the link not fail? Is there a converter involved? You could also look into IP SLA if your software supports it.
If you cannot use IP SLA then the other way is to run a routing protocol between the 2 sites. If the fa0/0 link fails it will stop receiving routes even if the interface remains up and so the s0/0 interface would be used. You would have to influence the metrics of the routes received so that the fa0/0 routes had the better metric than the s0/0 routes.
Assuming that your both links are terminated on same router, You can use the IP SLA feature to resolve your issue. Using which you can track the the object, and do config in a way that route will be flushed from routing table if object goes down..
If you require further help then pls mention which type of routing you are using i.e. static or dynamic ..
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.