Earticle

ForCES is a new open programmable architecture, it separates control and forwarding, it also abstracts resources of Forwarding Elements (FE) into some Logical Function Blocks (LFB), Control Element (CE) can reconfigure the forwarding function of FEs by recomposing their LFB chains. Firstly, A SDN architecture based on ForCES is proposed. Then, based on the formalization of the concept of LFB and the traditional I/O matching algorithm, an LFB chain composition method is proposed. This method can combine a series of LFBs to an LFB chain according to special application request. Based on the LFB chain composition algorithm, an improved algorithm is proposed, which can improve the composition efficiency. At last, an example is provided to illustrate how this method works, and a simulation is given to compare the efficiency of the base algorithm and the improved algorithm.