Patent ID: 7193970

Claim:
A method for forming protected routes, the method comprising: routing several functional layers from bottom to up in a way that the layer under formation is routed into the layer below the layer under formation, starting from the layer above the bottom layer, and finishing when the top layer is routed into the layer below the top layer, each routing in turn taking into account protection demands, and taking into account the routing possibilities in the layer below, wherein each route includes two separate paths in a communications network, which network includes several functional layers on top of one another, each layer forming demands for protected routes in the layers below, wherein after each routing of the layer under formation, the protection demands are assessed and the routings of the layers below are changed in a way that the first below layer is routed first again, and the second below layer is routed second, wherein the routing is continued until there is no need to route again and the protection demands are met.