method of establishing a route redundancy in a data transmission system using static routes , this system comprising a plurality of networks and a plurality of routers , a defined router being able to use several routes to reach a destination network . this method comprises the steps of defining all the static routes toward the destination network , verifying for each defined static route whether the destination network is reachable resulting in a set of static routes considered as eligible to be used , defining a priority for each route of the set of static routes , and selecting the static route having the highest priority as the route to be used . a conventional static route may be used if none of these static routes is available .