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Optimal Polynomial Time Algorithm for Restoring Multicast Cloud Services
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Date : 2018-12-27
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Abstract—The failure-prone nature of data center networks has evoked countless contributions to develop proactive and reactive countermeasures. Yet, most of these techniques were developed with unicast services in mind. When in fact, multiple services hosted in data center networks today rely on multicast communication to disseminate traffic. Hence, the existing survivability schemes fail to cater to the distinctive properties and quality of service requirements that multicast services entail. This letter is devoted to understanding the ramifications of facility node or substrate link failure on multicast services residing in cloud networks. We formally define the multicast virtual network restoration problem and prove its NP-complete nature in arbitrary graphs. Furthermore, we prove that the problem can be solved in polynomial-time in multi-rooted treelike data center network topologies.
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