Grzegorz Rzym

A survey on methods to provide interdomain multipath transmissions

Interdomain routing relies on BGP, which does not allow multipath transmissions. Since there is usually more than one path between any pair of nodes on the Internet, it would be beneficial to have the possibility of using them at the same time. Over the years, many solutions have appeared.In this survey, we show how 17 different approaches suggest solutions for providing interdomain multipath transmission. We divide presented mechanisms based on their relevance, starting from the most significant (assessed subjectively based on publications) and already available (implemented). Firstly, all the mechanisms are presented at a glance. Afterwards, each mechanism is described in more details. After a coherent presentation of each approach, they are compared, contrasted, and subjectively assessed. The comparison criteria include proposal visibility, additional signalling, mechanism complexity, time scale of operation, provided routing type, and path choice entities or path setup procedure. The goal of the survey is to show that there are numerous approaches to providing interdomain multipath transmissions in current IP-based networks.

A Comparison of QoS Parameters of WebRTC Videoconference with Conference Bridge Placed in Private and Public Cloud

This paper is devoted to analysis of QoS parameters of WebRTC traffic presented for centralized videoconferencing system used for collaborative work. This system consists of a videoconference application, built according to the WebRTC architecture, and a telemetric system, built as the IoT environment. Tests were carried out for three locations of the conference bridge: in private cloud (the OpenStack cloud), in public cloud (the AWS cloud) and in local network. Results show, that conference bridge in a cloud is a good solution for the WebRTC, and additional transmission of telemetric data do not affect the QoS parameters of WebRTCs media stream

SDNRoute: Integrated system supporting routing in Software Defined Networks

In this paper we introduce the SDNRoute system which aims to support routing decisions in Software Defined Networks. Such a system is especially important in the context of the SDN as this concept makes it possible to perform routing in a dynamic and elastic manner. We focus on the SDNRoute architecture and research challenges that must be investigated to develop the system. Additionally, we provide preliminary approaches to solve the issues including optimization problem formulation. Recent state of the art is presented regarding not only academia works but also industry deployments. It is especially important as SDNRoute system is being designed for the purpose of commercial application.

SDN-Based WAN Optimization: PCE Implementation in Multi-Domain MPLS Networks Supported By BGP-LS

Abstract In order to provide efficient and flexible resource management and path set-up in high-speed MPLS/GMPLS networks, the PCE (Path Computation Element) architecture was proposed by IETF. Implementation of a central module for the path set-up enables network operators to run path establishment operations for applications with explicitly defined objective functions and QoS requirements. The paper reports on recent research and experimental investigations with PCE-based path computation performed according to the 3- layered traffic engineering (TE) system consisting of: (1) a PCE module equipped with the IBM Cplex LP solver used in the highest layer 3, and (2) a SDN controller in the intermediate layer 2 responsible for transferring path setup requests towards virtual routers in the lowest layer 1. The presented results show usefulness of the PCE-supporting architecture with an SDN controller and applicability of bandwidth-oriented optimization based on real-time focused constraints (path delay limits). We emphasise that even a simple optimization approach shows the power provided by the SDN, i.e., flexibility of flows. This property is in practice not feasible in classical IP or MPLS networks, that is the usage of flow-based routing provided by network programmability really opens opportunities in network tuning

Analysis of PCE-based path optimization in multi-domain SDN/MPLS/BGP-LS network

Deployment of PCE (Path Computation Element) architecture in high-speed MPLS/GMPLS networks is at present widely accepted and helps to run path setup operations for applications with explicitly defined objective functions and also with QoS requirements. The paper reports on recent research investigations with PCE-based path computation employing 3-layer traffic engineering (TE) system: PCE module equipped with IBM Cplex LP solver is used in the highest layer, SDN controller in the intermediate layer responsible for transferring path setup requests towards virtual routers in the lowest layer. Presented results show usefulness of PCE architecture with SDN controller and applicability of bandwidth-oriented optimization with objective functions.

Traffic flow characterization of cloud applications used in campus network

The paper reports the results from flow-based measurements carried in campus network of AGH-UST. We have conducted detailed analysis of traffic streams in order to find most active online applications. Measurements were carried with the focus to find most active applications, anomalies and also malicious users. It was shown that Facebook, YouTube and Dropbox, they constitute highest and rather stable contributions to whole traffic exchanged with Internet. Presented results show sizes, lengths, inter-arrival times supplemented by average packet sizes of flows belonging to analysed applications.