Planning multiservice VPN networks: an analytical/simulative mechanism to dimension the bandwidth assignments

Authors:
Raffaele Bolla;Roberto Bruschi;Franco Davoli
Affiliations:
DIST – Department of Communications, Computer and Systems Science, University of Genoa, Genova, Italy;DIST – Department of Communications, Computer and Systems Science, University of Genoa, Genova, Italy;DIST – Department of Communications, Computer and Systems Science, University of Genoa, Genova, Italy
Venue:
QoS-IP'05 Proceedings of the Third international conference on Quality of Service in Multiservice IP Networks
Year:
2005

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Abstract

The planning of a Virtual Private Network, carrying both Quality of Service (QoS) and Best-Effort (BE) traffic is considered in the paper, and a hybrid analytical/simulation tool for link bandwidth allocation is proposed and tested. The tool works in three phases, related to assessing the capacities needed to satisfy requirements for QoS and BE traffic individually, and to take into account the effects of multiplexing gains arising from traffic mixing, respectively. The analytical part is based on a simplified version of call-level (circuit-switched) traffic models; the simulation model is a fast one, based on a fluid representation of TCP traffic aggregates. The tool is tested both on simple networks and on a more complex real national backbone.