The router based on ForCES (Forwarding and Control Elements Separation) architecture could satisfy the requirements of openness, scalability and programmability for the next generation routers, so it attracted much attention. The router is composed by Control Elements (CEs) and Forwarding Elements (FEs). This study focuses on the Smart-OSPF (Open Shortest Path First) routing among FEs. Smart-OSPF contains two steps. In the first step, the source FE forwards the traffic to the neighbor FEs. In the second step, the neighbor FEs use the OSPF protocol to forward the traffic to the destination FE. The OSPF protocol in the second step only forwards traffic using the shortest path, even if the path is congested, the traffic will not be switched to other paths. For improving Smart-OSPF, firstly, the study proposes an improved scheme called W-S-OSPF, in which, there will be multiple paths from the neighbor FEs to the destination FE. Secondly, the study builds the optimization model, which optimizes the maximum link utilization between FEs, so that, the congestion will also be reduced. Finally, according to experiment results, W-S-OSPF could improve 20-55% in the maximum utilization of the link. The study provides a foundation for ForCES router performance research.
展开▼
