Abstract. In the NE (Network Element) of ForCES (Forwarding and Control Element Separation) architecture, there may be hundreds of FEs (Forwarding Element). These FEs’ performance directly reflects the NE’s ability of processing data and providing services. Their topologies exist in various forms. In this paper, the common features of these topologies are studied, and a performance solving method that abstracting FE as GPS scheduler is proposed. Under the self-similar FBM (Fractional Brownian Motion) traffic, the performance bounds of multiple flows processed by a single FE are derived. In order to guarantee the performance of the through traffic, based on the performance model, the requirements of processing weight in each FE are analyzed