Weighted fair RIO (WF-RIO) for fair AF bandwidth allocation in a diffserv-capable MPLS network

Abstract

RIO is the primary active queue management technology for handling AF(assured forwarding) class traffic for services that have minimum bandwidth guarantees. However, RIO unfairly allocates the excess AF bandwidth among LSPs(label-switched paths) which have TCP flows aggregated as AF class in a DiffServ-Capable MPLS Network. This issue obstructs the business model in which ISPs promote LSP users to expand the LSP-required bandwidth for enriching the quality of AF traffic. In this paper, we propose a way, called weighted fair RIO (WF-RIO), to resolve this issue. WF-RIO can allocate the excess AF bandwidth among LSPs in proportion to their AF minimum guaranteed bandwidth by multiplying the dropping probability of RIO by an LSP-specific weight which is simply calculated from the traffic rates for the individual LSPs. We evaluate the proposed method by computer simulation and demonstrate its effectiveness. © IFIP International Federation for Information Processing 2004.