János Farkas

Learn More
Ethernet is becoming increasingly popular in metro and carrier-grade networks because of its cost-effectiveness, simplicity and scalability. Nevertheless, Ethernet was originally designed as a LAN technology, therefore, it lacks some features, such as fast fault-protection and sophisticated management, which are very important in the new carrier-grade(More)
Ethernet provides a simple and low-cost solution at high bandwidth for access and metropolitan networks. The failover performance of bridges is indispensable of their applicability. Therefore, new IEEE protocols were developed and deployed in support of fast recovery. Rapid Spanning Tree Protocol (RSTP) is the current fault handling mechanism for generic(More)
This article provides an overview of a method to enhance the load spreading algorithms used by IEEE 802.1aq Shortest Path Bridging. The technique has a number of interesting properties with respect to distributing load on the basis of a measure of link utilization. What this provides is balanced network utilization and the ability to apply subtle(More)
Admission control algorithms used in access networks for multiplexed voice sources are typically based on aggregated system characteristics, such as aggregate loss probability. Even though the relation of these aggregate performance measures to the performance of specific flows is not trivial, it has gained limited attention so far. We propose an admission(More)
Distance measuring is a very important task in digital geometry and digital image processing. Due to our natural approach to geometry we think of the set of points that are equally far from a given point as a Euclidean circle. Using the classical neighbourhood relations on digital grids, we get circles that greatly differ from the Euclidean circle. In this(More)
This paper gives an overview on how Software Defined Networking (SDN) principles can be applied to existing Ethernet merchant silicon considering the requirements modern networks face. We show that existing Layer 2 features specified by IEEE 802.1Q support SDN. The bridge architecture [1] supports control plane/data plane split by design and also allows for(More)
Ethernet is becoming increasingly popular in metro and access networks due to the high bandwidth available at low cost. Nonetheless, native Ethernet lacks some features that are important for sophisticated network management; providing accurate knowledge on the physical topology is one of them. Therefore, automatic physical topology discovery in support of(More)