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Survivable virtual network mapping with content connectivity against multiple link failures in optical metro networks
Journal of Optical Communications and Networking ( IF 4.0 ) Pub Date : 2020-07-31 , DOI: 10.1364/jocn.397565
Giap Le , Sifat Ferdousi , Andrea Marotta , Sugang Xu , Yusuke Hirota , Yoshinari Awaji , Massimo Tornatore , Biswanath Mukherjee

Network connectivity, i.e., the reachability of any network node from all other nodes, is often considered as the default network survivability metric against failures. However, in the case of a large-scale disaster disconnecting multiple network components, network connectivity may not be achievable. On the other hand, with the shifting service paradigm towards the cloud in today’s networks, most services can still be provided as long as at least a content replica is available in all disconnected network partitions. As a result, the concept of content connectivity has been introduced as a new network survivability metric under a large-scale disaster. Content connectivity is defined as the reachability of content from every node in a network under a specific failure scenario. In this work, we investigate how to ensure content connectivity in optical metro networks. We derive necessary and sufficient conditions and develop what we believe to be a novel mathematical formulation to map a virtual network over a physical network such that content connectivity for the virtual network is ensured against multiple link failures in the physical network. In our numerical results, obtained under various network settings, we compare the performance of mapping with content connectivity and network connectivity and show that mapping with content connectivity can guarantee higher survivability, lower network bandwidth utilization, and significant improvement of service availability.

中文翻译:

具有内容连接能力的可生存虚拟网络映射,可应对光城域网中的多链路故障

网络连接性,即任何网络节点与所有其他节点之间的可达性,通常被视为针对故障的默认网络生存能力度量。但是,在大规模灾难断开多个网络组件的情况下,可能无法实现网络连接。另一方面,随着当今网络中服务模式向云的转移,只要在所有断开的网络分区中至少有内容副本可用,大多数服务仍然可以提供。结果,在大规模灾难下,内容连接的概念已被引入作为新的网络生存能力度量标准。内容连接性定义为在特定故障情况下,网络中每个节点的内容可访问性。在这项工作中 我们研究了如何确保光学城域网中的内容连接。我们得出必要和充分的条件,并开发我们认为是新颖的数学公式,以在物理网络上映射虚拟网络,从而确保虚拟网络的内容连接免受物理网络中的多个链接故障的影响。在各种网络设置下获得的数值结果中,我们比较了具有内容连接和网络连接的映射的性能,并表明具有内容连接的映射可以确保更高的生存能力,更低的网络带宽利用率以及服务可用性的显着提高。我们得出必要和充分的条件,并开发我们认为是新颖的数学公式,以在物理网络上映射虚拟网络,从而确保虚拟网络的内容连接免受物理网络中的多个链接故障的影响。在各种网络设置下获得的数值结果中,我们比较了具有内容连接和网络连接的映射的性能,并表明具有内容连接的映射可以确保更高的生存能力,更低的网络带宽利用率以及服务可用性的显着提高。我们得出必要和充分的条件,并开发我们认为是新颖的数学公式,以在物理网络上映射虚拟网络,从而确保虚拟网络的内容连接免受物理网络中的多个链接故障的影响。在各种网络设置下获得的数值结果中,我们比较了具有内容连接和网络连接的映射的性能,并表明具有内容连接的映射可以确保更高的生存能力,更低的网络带宽利用率以及服务可用性的显着提高。
更新日期:2020-08-04
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