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Optical networks are crucial to support increasingly demanding cloud services. Delivering the requested quality of service is key to successfully provisioning end-to-end services in clouds. Therefore, as for traditional optical network services, it is of utter importance to guarantee that clouds are resilient to any failure of either network infrastructure(More)
Survivability in IP-over-WDM networks has already been extensively discussed in a series of studies. Up to date, most of the studies assume single-hop working routing of traffic requests. In this paper, we study the multi layer survivable design of a logical topology in the context of multiple-hop working routing for IP layer traffic requests. The design(More)
Optical networks constitute a fundamental building block that has enabled the success of cloud computing. Virtualization, a cornerstone of cloud computing, today is applied in the networking field: physical network infrastructure is logically partitioned into separate virtual networks, thus providing isolation between distinct virtual network operators(More)
—Optical networks are crucial to support increasingly demanding cloud services. Delivering the requested quality of services (in particular latency) is key to successfully provisioning end-to-end services in clouds. Therefore, as for traditional optical network services, it is of utter importance to guarantee that clouds are resilient to any failure of(More)
We propose a novel protection scheme, called shortcut N<i>p</i>-cycles (short for node <i>p</i>-cycles), which (<i>i</i>) offers 100% guaranteed protection against any single link or node failures in wavelength-division multiplexing (WDM) mesh networks, (<i>ii</i>) provides recovery paths, which are free of loop backs, and (<i>iii</i>) bestows some(More)
Both business and consumer applications increasingly depend on cloud solutions. Yet, many are still reluctant to move to cloud-based solutions, mainly due to concerns of service quality and reliability. Since cloud platforms depend both on IT resources (located in data centers, DCs) and network infrastructure connecting to it, both QoS and resilience should(More)
We study the design of logical survivable topologies for service protection against single or multiple failures in IP-over-WDM networks where protection can be provided either at the optical layer, or at the network (IP) layer. Indeed, synergies need to be developed between IP and optical layers in order to optimize the resource utilization and to reduce(More)