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In an IP over WDM network architecture, IP traffic is carried over a virtual topology (VT), composed of optical transparent channels called lightpaths. We propose an energy-efficient dynamic VT adaptation method with sleep mode, which allows changing only one lightpath connectivity at a time by dynamically monitoring the IP packet traffic load on each lightpath. In order to assure the connectivity...
In IP over WDM networks, a single failure in the WDM layer breaks down multiple IP links and may leave the virtual topology disconnected. This will make the restoration by the IP layer impossible, which must be avoided by suitable virtual topology design. In this paper, we focus on single-node failure and develop a Remove-Node Algorithm to map IP links on lightpaths in such a way that the IP topology...
In IP-over-WDM networks, wavelength services (circuits) are often protected by dedicated backup circuits. The upcoming deployment of 100G transmission systems will induce huge under-utilization of backup resources. Network utilization can be boosted by loaning the idle backup circuits to preemptible IP/packet services. Unfortunately, in the event that a backup circuit used for IP services fails, all...
The transport traffic in WDM optical networks are provided to the networks customers in the form of lightpath via virtual topology reconfiguration (VTR), thus the algorithm to perform such an VTR has crucial impact on the resource usage efficiency. This paper proposes the routing algorithm of the Virtual Topology Reconfiguration based on the Genetic Algorithm (VTR-GA) for static traffic in the IP/WDM...
The survivable logical topology mapping (SLTM) problem in an IP-over-WDM optical network is to map each link (u, v) in the logical topology (at the IP layer) into a lightpath between the nodes u and v in the physical topology (at the optical layer) such that failure of a physical link does not cause the logical topology to become disconnected. It is assumed that both the physical and logical topologies...
In this paper, we propose a cooperation mechanism among multiple virtual topologies in wavelength-routed optical networks. It is based on attractor selection and superimposition, which models the biological systems that behave cooperatively and symbiotically only by sharing a small amount of information with each other. While our proposed method allows each virtual topology to be controlled in a distributed...
The survivable logical topology mapping problem in an IP-over-WDM optical network is to map each link (u, v) in the logical topology (at the IP layer) into a lightpath between the nodes u and v in the physical topology (at the optical layer) such that failure of a physical link does not cause the logical topology to become disconnected. Kurant and Thiran presented an algorithmic framework called SMART...
Two multi-layer network backup capacity recovery mechanisms, which are static and dynamic mechanisms, have been proposed to realize survivability strategy in IP over WDM multi-layer network. Compared with the static one, the dynamic backup capacity mechanism is adopted as its flexibility which is more suitable for the development in the current network. To achieve better performance of resource utilization,...
Bandwidth requirements of the Internet are increasing every day. Wavelength division multiplexing (WDM) is the next step towards leveraging the capabilities of the optical fiber, especially for wide area backbone networks. Reconfiguration is a characteristic of WDM optical networks that allows network operators to arrange the networks in response to the changing traffic demands. As a general assumption,...
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