OSPF autonomous system with a backbone divided into two sub-areas

摘要

Data communication system of the type wherein a plurality of contiguous transmission networks constitute an Autonomous System (AS) using the Open Shortest Path First (OSPF) protocol for the exchange of information, said system being divided into several areas including an area 0 or backbone (14) responsible for distributing routing information between the other areas (10, 12). The backbone is divided into two sub-areas (14-1, 14-2) and comprises at least a couple of a first and a second adjacent splitting routers (40, 42), the first splitting router being included in one sub-area and the second splitting router being included in the other sub-area. The topological data base of each said splitting router is set up to define a high metric for the link between the splitting routers in order to prevent any type of data traffic other than link-state messages (LSA) from being transmitted between the splitting routers.