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Multi-link failures in the Internet may incur heavy packet loss and degrade the network performance. Existing approaches have been proposed to address this issue by enabling routing protections. However, the effectiveness and efficiency issues of these approaches are not well addressed. In particular, it has not been answered that whether label-free routing can provide full protection against arbitrary...
Networking infrastructure consumes a sizable fraction of the electricity supply. A network design model aimed at maximizing energy savings by aggregating traffic demand at a small set of resources, to put under-utilized resources to sleep, is offset by legacy models aimed at maximizing the network throughput by spreading the load across network resources. Traffic fluctuations and sudden spikes further...
The Internet explosion has drastically increased the bandwidth demand of modern telecommunication networks and as optical networks provide an opportunity for the future Internet, it is expected that Internet providers will gradually replace their infrastructures with optical networks. The Internet is a decentralized set of networks (more than 29.000) known as domains or Autonomous Systems on a well-known...
Wavelength-Routing (WR) networks are the most common solution for core networks. With the access segment moving from copper to Passive Optical Networks (PON), core networks will become one of the major culprits of Internet power consumption. However, WR networks offer some design flexibility which can be exploited to mitigate their energy requirements. One of the main steps which has to be faced in...
Tremendously increasing bandwidth demands on the Internet require high transmission capacity and reliable end-to-end connections which are offered by optical WDM networks. Huge bandwidth demands of the applications cause rising energy consumption at the optical cross-connects which contributes a significant portion of the total electricity consumption. In this paper, we study the availability design...
With the rapid advancements in wavelength-division multiplexing (WDM) technology, the capacity of optical fibers is increasing considerably. Traffic streams from users generally have a data-rate that is far less than the bandwidth of optical fibers or that of a lightpath in optical fibers. Traffic grooming can be used to group the traffic streams from various users and match to the data-rate of a...
Wavelength division multiplexing (WDM) is the next step towards leveraging the capabilities of the optical fiber, especially for wide-area backbone optical data communication networks. In this paper, we analyze some of the key architecture and discuss the models corresponding approaches and advances made toward addressing these issues. We first analyze the different IP/WDM networking framework models,...
The emergence of wavelength division multiplexing (WDM) technology has led to a tremendous increase in the available transmission capacity in wide area network (WAN). This technology is also being used in backbone networks. For a large-scale network, it is difficult to maintain the centralized global state information of the network. Hence, distributed methods are required to organize network nodes...
IP over WDM is a promising architecture for the next generation Internet (NGI) backbones. Traffic engineering (TE) for next generation multimedia services is a new challenge for multilayer co-operation within these communication networks. In MPLS/GMPLS based IP over WDM networks, the TE process is accomplished by the establishment of an adequate logical topology, above the underlying optical topology...
Survivability is a critical requirement for reliable services in any network. As the Internet moves towards a three layer architecture consisting of Overlay on top of IP on top of WDM-based networks incorporating the interaction between and among network layers is crucial for efficient and effective implementation of survivability. This paper highlights the challenges of providing survivability in...
Telecommunication networks spanning large areas are subject to various failures. A survivable network provisioning scheme addressing multiple levels of network failures, especially disaster failures which may take out many network components, is desirable in the future Internet. In this study, we propose and investigate the characteristics of a multistate multipath provisioning scheme for telecom...
Designing a network with traffic uncertainty considerations has become crucial due to a new network architecture such as the IP-over-optical network, where the IP-based traffic can be routed directly over the optical layer. Together with the explosive growth of the Internet, the variation in traffic volume, which is termed demand uncertainty in this paper, will be one of the most important constraints...
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,...
The automatically switched optical networks (ASONs) and the generalized multi protocol label switching (GMPLS) control plane are envisaged to play an important role in the next generation Internet. ASON/GMPLS networks enable the multilayer traffic engineering (MTE) paradigm which facilitates the interaction between the IP and the dense wavelength division multiplexing (DWDM) layers. In such dynamic...
This paper describes a new path computation model in Multi-protocol Label Switching (MPLS) and Generalized MPLS (GMPLS) networks. It introduces a path computation element (PCE), which is functionally separate from label switching routers (LSRs). The Path Computation Element (PCE) is an entity that is capable of computing a network path or route based on a network graph, and applying computational...
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