Results 1 - 10 of 83

Integrated Logical Topology Design and LSP Configuration for MPLS/WDM Networks

by Mark Shayman, Kwang−il Lee, Lakshmi Sharmila, Sudarsan Overview , 2002
"... If IP is implemented over a reconfigurable WDM network, the logical links between routers can be changed in response to changes in traffic demands Traffic engineering in an MPLS/WDM network requires both logical topology design and LSP routing and provisioning can be formulated as Mixed Integer Line ..."
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If IP is implemented over a reconfigurable WDM network, the logical links between routers can be changed in response to changes in traffic demands Traffic engineering in an MPLS/WDM network requires both logical topology design and LSP routing and provisioning can be formulated as Mixed Integer

Preserving Survivability During Logical Topology Reconfiguration in WDM Ring Networks

by Hwajung Lee, Hongsik Choi, Suresh Subramaniam, Hyeong-ah Choi
"... We consider the design of reconfiguring logical topologies over physical WDM ring networks. The logical topology consists of the same set of nodes as the physical topology, and the links of the logical topology are lightpaths established (or embedded) over the physical topology. The logical topology ..."
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We consider the design of reconfiguring logical topologies over physical WDM ring networks. The logical topology consists of the same set of nodes as the physical topology, and the links of the logical topology are lightpaths established (or embedded) over the physical topology. The logical

Logical topology

by Mark Shayman, Kwang-il Lee, Lakshmi Sharmila, Sudarsan Overview , 2003
"... If IP is implemented over a reconfigurable WDM network, the logical links between routers can be changed in response to changes in traffic demands Traffic engineering in an MPLS/WDM network requires both logical topology design and LSP routing and provisioning – can be formulated as Mixed Integer Li ..."
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If IP is implemented over a reconfigurable WDM network, the logical links between routers can be changed in response to changes in traffic demands Traffic engineering in an MPLS/WDM network requires both logical topology design and LSP routing and provisioning – can be formulated as Mixed Integer

Proposal for Procedures to Reconfigure Logical Topologies in Reliable WDM-Based Mesh Networks

by Shinya Ishida, Shin'ichi Arakawa, Masayuki Murata , 2002
"... A Wavelength Division Multiplexing (WDM) network o#ers a flexible networking infrastructure by assigning the route and wavelength of optical transparent channels (also known as lightpaths). We can construct an optimal logical topology, by properly setting up the lightpaths. Furthermore, setting up ..."
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this reconfiguration, tra#c loss may occur due to the deletion of older lightpaths. In this paper, we consider reconfiguring the logical topology in reliable WDM-based mesh networks, and we propose five procedures that can be used to reconfigure a running lightpath to a new one.

Algorithms for the Logical Topology Design in WDM All-Optical Networks

by E. Leonardi, M. Mellia, M. Ajmone Marsan - OPTICAL NETWORKS , 2000
"... In this paper we discuss the optimal design of logical topologies in alloptical WDM networks. We first explain the key aspects of the problem, and provide a mixed integer linear programming formulation, which however leads to unacceptably high complexity for networks of non-trivially small size. We ..."
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In this paper we discuss the optimal design of logical topologies in alloptical WDM networks. We first explain the key aspects of the problem, and provide a mixed integer linear programming formulation, which however leads to unacceptably high complexity for networks of non-trivially small size. We then

Virtual topology reconfiguration of wavelength-routed optical WDM networks

by Byrav Ramamurthy, Ashok Ramakrishnan - in Proceedings of IEEE GLOBECOM , 2000
"... The bandwidth requirements of the Internet are increas-ing every day and there are newer and more bandwidth-thirsty applications emerging on the horizon. Wavelength division multiplexing (WDM) is the next step towards leveraging the capabilities of the optical fiber, especially for wide-area backbon ..."
Abstract - Cited by 27 (1 self) - Add to MetaCart
of the underlying network. This virtual topology can be reconfigured when necessary, to improve performance. We discuss the previous work done on vir-tual topology design and also discuss and propose different reconfiguration algorithms applicable under different sce-narios.

Rollout Algorithms for Logical Topology Design and Traffic Grooming in Multihop WDM Networks

by Kwangil Lee, Mark A. Shayman
"... Abstract — In this paper we consider the logical topology design and traffic grooming problem in multihop WDM networks. Usually, this problem is defined as an integer linear program (ILP) which is NP-complete. This justifies the use of heuristic algorithms. Many heuristic algorithms differ in the or ..."
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Abstract — In this paper we consider the logical topology design and traffic grooming problem in multihop WDM networks. Usually, this problem is defined as an integer linear program (ILP) which is NP-complete. This justifies the use of heuristic algorithms. Many heuristic algorithms differ

Genetic Algorithms for Designing Multihop Lightwave Network Topologies

by C. Gazen, C. Ersoy , 1999
"... Multihop lightwave networks are a means of utilizing the large bandwidth of optical fibers. In these networks, each node has a fixed number of transmitters and receivers connected to a common optical medium. A multihop topology is implemented logically by assigning different wavelengths to pairs of ..."
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of transmitters and receivers. By using tunable lasers or receivers, it is possible to modify the topology dynamically when node failures occur or traffic loads change. The reconfigurability of logical multihop lightwave networks requires that optimal topologies and flow assignments be found. In this article

Design method of logical topologies with quality of reliability in WDM networks

by Junichi Katou , 2002
"... According to a rapid growth of the bandwidth capacity of the WDM network, traffic loss due to a failure of the network components is becoming unacceptable. To overcome this problem, a protection method that prepares backup lightpaths for each working path is now considered to enhance the reliability ..."
Abstract - Cited by 2 (0 self) - Add to MetaCart
lightpath is switched to the backup lightpath. We then propose a heuristic algorithm to design a logical topology with satisfying QoR requirement for every node pair. Our objective is to minimize the number of necessary wavelengths on a fiber in the logical topology to carry the traffic with required Qo

Dynamic reconfiguration and routing algorithms for IP-over-WDM networks with stochastic traffic

by Andrew Brzezinski, Eytan Modiano - PROCEEDINGS OF IEEE INFOCOM , 2005
"... We develop algorithms for joint IP-layer routing and WDM logical topology reconfiguration in IP-over-WDM networks experiencing stochastic traffic. At the wavelenght division multiplexing (WDM) layer, we associate a nonnegligible overhead with WDM reconfiguration, during which time tuned transceiver ..."
Abstract - Cited by 16 (9 self) - Add to MetaCart
We develop algorithms for joint IP-layer routing and WDM logical topology reconfiguration in IP-over-WDM networks experiencing stochastic traffic. At the wavelenght division multiplexing (WDM) layer, we associate a nonnegligible overhead with WDM reconfiguration, during which time tuned
Results 1 - 10 of 83