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Implementing fair bandwidth allocation schemes in hose-modelled VPN

Summary: Implementing fair bandwidth allocation schemes in
hose-modelled VPN
D. Wei and N. Ansari
Abstract: The virtual private network (VPN) provides customers with predictable and secure
network connections over a shared network infrastructure. The recently proposed hose model for
VPNs has desirable properties in terms of greater flexibility and better multiplexing gain. However,
the `classic' fair bandwidth allocation scheme introduces the issue of low overall utilisation in this
model; furthermore, when the VPN links are established, the VPN customers cannot manage their
VPN resources by themselves dynamically. The authors propose a fluid hose-modelled VPN, and
based on this model they develop an idealised fluid fair bandwidth allocation scheme to improve
the performance of the VPN. With the proposed scheme, they achieve two goals: maximising the
overall throughput of the VPN; and providing a mechanism that enables the VPN customers to
allocate the bandwidth according to their own requirements, thus achieving the predictable QoS
performance. Based on deficit round robin (DRR), a transmission scheduling scheme for output
buffer switches, a novel scheme, two-dimensional deficit round robin (2-D DRR), is developed to
approximate/realise the idealised fluid fair bandwidth allocation scheme for the hose-modelled
VPN. The simulation results also show that the 2-D DRR can improve the overall throughput
without compromising fairness and implementation complexity.
1 Introduction
Virtual private network (VPN) refers to the communication


Source: Ansari, Nirwan - Department of Electrical and Computer Engineering, New Jersey Institute of Technology


Collections: Engineering