Abstract: The embodiments relate to a method and a routing device. The method comprises introducing a logical hierarchy by defining a plurality of transit layers wherein to each transit layer a transit layer address is assigned and a transit router and wherein each transit router has a unique network address; the layers are organized in a descending order of subnet masks; for each interface between a router and said transit routers, defining, in a routing table of said router, a static route based on the transit layer address and the subnet mask of the transit router interfacing with the router; and if a connection that carries traffic between the router and any of the transit routers fails, selecting a static route in said routing table as a redundant route for carrying said traffic towards its destination.

Abstract: The embodiments relate to a method and a routing device. The method comprises introducing a logical hierarchy by defining a plurality of transit layers wherein to each transit layer a transit layer address is assigned and a transit router and wherein each transit router has a unique network address; the layers are organized in a descending order of subnet masks; for each interface between a router and said transit routers, defining, in a routing table of said router, a static route based on the transit layer address and the subnet mask of the transit router interfacing with the router; and if a connection that carries traffic between the router and any of the transit routers fails, selecting a static route in said routing table as a redundant route for carrying said traffic towards its destination.