The new Carrier Ethernet services offered by providers require not only a huge amount of bandwidth, but also a more flexible access to bandwidth that the traditional transport networks, based on circuit-switching, can hardly provide. Carriers have nowadays the option of migrating to new layer-2 frame-switched technologies developed ad hoc to support Carrier Ethernet. An important question is whether this migration is really cost effective. This paper deals with the problem of designing a transport network able to support Carrier Ethernet. We compare two network models, one based on layer-2 switching and Ethernet interfaces, the other based on legacy circuit switching and SDH interfaces. Minimization of investments for network interfaces is carried out for the two models, given the same static-traffic matrix to be supported. Both an ILP formulation and a heuristic method are proposed to solve the design problem. The results presented for comparison are obtained by applying the optimization procedures to a case-study network.
"The experiments have been carried out considering both realistic and randomly generated networks. Three realistic network topologies commonly used in the Carrier Grade Ethernet literature were adopted: the nobel-germany network used in , ii) the GEANT network used in , and iii) the USA- 24 network used in . Link capacity was equal to 100 Gbps for all the links of the three networks. "
[Show abstract][Hide abstract] ABSTRACT: We propose an energy management framework to optimize the energy consumption of networks using the Multiple Spanning Tree Protocol such as Carrier Grade Ethernet networks. The objective is to minimize the energy consumption of nodes and links while considering QoS constraints. The energy management is done through the Multiple Spanning Tree Protocol (MSTP) by choosing from a given set the most appropriate Spanning Trees and the most appropriate edges to operate while respecting the traffic demands. A trade-off framework between energy consumption and network performance is proposed. Results show that it is possible to achieve a good traffic engineering while operating the network closer to the minimum energy value.
[Show abstract][Hide abstract] ABSTRACT: Since its definition by Metro Ethernet Forum (MEF), Carrier Ethernet (CE) service is becoming more and more important for service providers and network operators. The recently-developed MPLS-TP technology can be adopted to efficiently support CE over the Optical Transport Network (OTN). In order to reduce energy consumption and complexity, OTN relies on optical bypass at switching nodes. This makes optical signals subject to the physical-layer impairments. Driven by these considerations we propose a CE-based multi-layer network design approach, defining a reference node architecture and providing two heuristic algorithms to optimize resources jointly at the MPLS-TP and at the optical layer, while taking physical impairments into account. We finally show results of the application of the design algorithms on case-study networks.
[Show abstract][Hide abstract] ABSTRACT: In this paper, we propose a GPON-based transmission hierarchy (GTH) for metro network. Then a simulation testbed is constructed to study the GTH's performance on supporting wireless backhaul service. Simulation results show that, compared with MSTP, GTH reduces the cost of network expansion significantly for its higher transmission efficiency.
Communications and Photonics Conference and Exhibition (ACP), 2010 Asia; 01/2011
Data provided are for informational purposes only. Although carefully collected, accuracy cannot be guaranteed. The impact factor represents a rough estimation of the journal's impact factor and does not reflect the actual current impact factor. Publisher conditions are provided by RoMEO. Differing provisions from the publisher's actual policy or licence agreement may be applicable.