Abstract
Feature Issue on
Next-Generation WDM Network Design and Routing (WDMN). We
investigate the availability performance of networks with shared mesh restoration
and demonstrate that these networks cannot provide highly available protection
services. A major factor in the poor performance of shared mesh restoration is that
the resources at backup links are shared among demands. If multiple
service-affecting failures occur in the network a multitude of these demands will
rush to utilize the spare resources on backup links. These resources are not
adequate to serve all of these demands simultaneously. We propose a heuristic
routing algorithm that attempts to improve the availability performance of shared
mesh restoration. We measure the likelihood that a backup link will not be available
to restore a newly arrived demand if or when more than one failure occurs in the
network. We adjust the backup bandwidth on that link if the measured likelihood
exceeds a preset threshold. As a typical representative, we show that the downtime
improves by 7%, 11%, and 18% when the total backup bandwidth in the network is
increased by 5%, 10%, and 20%, respectively. These values are obtained through a
series of fitting experiments.
© 2003 Optical Society of America
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