Abstract
We study the provisioning of virtual private network (VPN) service over WDM
optical networks. For this purpose, we investigate the blocking performance of the
hose model versus the pipe model for the provisioning. Two techniques are presented:
an analytical queuing model and a discrete event simulation. The queuing model is
developed from the multirate reduced-load approximation technique. The simulation is
done with the OPNET simulator. Several experimental situations were used. The
blocking probabilities calculated from the two approaches show a close match,
indicating that the multirate reduced-load approximation technique is capable of
predicting the blocking performance for the pipe model and the hose model in WDM
networks. A comparison of the blocking behavior of the two models shows that the
hose model has superior blocking performance as compared with pipe model. By and
large, the blocking probability of the hose model is better than that of the pipe
model by a few orders of magnitude, particularly at low load regions. The
flexibility of the hose model allowing for the sharing of resources on a link among
all connections accounts for its superior performance.
© 2003 Optical Society of America
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