We would like to build up a full redundant internet access to our small business location. We have currently VDSL connection and would like to create a redundant connection over LTE as a backup. In order to provide Hardware redundancy, I would like to deploy LTE over a separate CPE.

Currently I am looking for solution alternatives and do not own any router for the project yet. Based on the solution, I will select the routers for which I have a budget of 2000USD per router. Here I would like ask, from LAN network how we can detect VDSL problems and and change the default to route LTE modem? BR,

Tolga