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— In the OpenFlow architecture, data-plane forwarding is separated from control and management functions. Forwarding elements make only simple forwarding decisions based on flow table entries populated by the SDN controller. While OpenFlow does not specify how topology monitoring is performed, the centralized controller can use Link-Layer Discovery Protocol(More)
This report defines a carrier-grade split architecture based on requirements identified during the SPARC project. It presents the SplitArchitecture proposal, the SPARC concept for Software Defined Networking (SDN) introduced for large-scale wide area networks such as access/aggregation networks, and evaluates technical issues against architectural(More)
Ethernet protocol is the most wide-spread protocol in the local area network (LAN) environment. It is cost effective, simple, and provides high speeds, exactly what is needed in the provider network. However, deployment in the provider network imposes carrier-grade requirements. Standardization bodies realized this, and they are extending its capabilities:(More)
The concept of software-defined networking (SDN) has emerged as a way to address numerous challenges with traditional network architectures by decoupling network control and forwarding. So far, the use cases for SDN mainly targeted data-center applications. This paper considers SDN for network carriers, facing operation of large-scale networks with(More)
Recent Internet access speeds have made it possible even for home users to reach and use previously unavailable bandwidth consuming (e.g. Video on Demand) services. However, the rapid spread of these applications is hindered by the lack of QoS guarantees in packet networks. In this article a QoS architecture is presented which have been designed for access(More)
In Multi-Layer networks, where more than one layer is dynamic , i.e., connections are set up using not only the upper, e.g., IP layer but the underlying wavelength layer as well leads often to subopti-mal performance due to long wavelength paths, that do not allow routing the traffic along the shortest path. The role of MLTE (Multi-Layer Traffic(More)
In Multi-Layer networks, where more than one layer is dynamic, i.e., connections are set up using not only the upper, e.g., IP layer but the underlying wavelength layer as well leads often to suboptimal performance. In this paper we discuss the the lightpath fregmentation and de-fragmentation problem, where the lighpath system can not follow the traffic(More)