Pengendalian Kemacetan Jaringan Melalui Per-Flow Multipath Routing

Kemacetan terjadi ketika jumlah paket yang ditransmisikan melalui jaringan telah mendekati kapasitas penanganan paket jaringan. Hal ini menjadi faktor utama untuk diketahui lebih dini, guna menghindari adanya kegagalan dalam proses routing. Sebagian besar protokol routing yang digunakan saat ini  menggunakan algoritma yang menghasilkan jalur tunggal saja, tanpa memperhatikan permintaan trafik yang bersifat fluktuatif. Penggunaan jalur tunggal dapat menyebabkan terjadinya kemacetan yang berdampak kepada pemborosan sumber daya. Penelitian ini bertujuan untuk melakukan pengendalian kemacetan jaringan dengan mengkombinasikan mekanisme multipath routing dan congestion control pada protokol routing OSPF. Hasil pengujian menunjukkan keunggulan sistem dalam tiga aspek, yaitu kestabilan nilai throughput (100%) sehingga tidak ada packet loss, pengiriman data 50% lebih cepat, dan utilisasi jaringan yang lebih baik

Analysis of Network Parameters Influencing Performance of Hybrid Multimedia Networks

Multimedia networks is an emerging subject that currently attracts the attention of research and industrial communities. This environment provides new entertainment services and business opportunities merged with all well-known network services like VoIP calls or file transfers. Such a heterogeneous system has to be able satisfy all network and end-user requirements which are increasing constantly. Therefore the simulation tools enabling deep analysis in order to find the key performance indicators and factors which influence the overall quality for specific network service the most are highly needed. This paper provides a study on the network parameters like communication technology, routing protocol, QoS mechanism, etc. and their effect on the performance of hybrid multimedia network. The analysis was performed in OPNET Modeler environment and the most interesting results are discussed at the end of this pape

Multi-Core Parallel Routing

The recent increase in the amount of data (i.e., big data) led to higher data volumes to be transferred and processed over the network. Also, over the last years, the deployment of multi-core routers has grown rapidly. However, such big data transfers are not leveraging the powerful multi-core routers to the extent possible, particularly in the key function of routing. Our main goal is to find a way so we can use these cores more effectively and efficiently in routing the big data transfers. In this dissertation, we propose a novel approach to parallelize data transfers by leveraging the multi-core CPUs in the routers. Legacy routing protocols, e.g. OSPF for intra-domain routing, send data from source to destination on a shortest single path. We describe an end-to-end method to distribute data optimally on flows by using multiple paths. We generate new virtual topology substrates from the underlying router topology and perform shortest path routing on each substrate. With this framework, even though calculating shortest paths could be done with well-known techniques such as OSPF's Dijkstra implementation, finding optimal substrates so as to maximize the aggregate throughput over multiple end-to-end paths is still an NP-hard problem. We focus our efforts on solving the problem and design heuristics for substrate generation from a given router topology. Our heuristics' interim goal is to generate substrates in such a way that the shortest path between a source-destination pair on each substrate minimally overlaps with each other. Once these substrates are determined, we assign each substrate to a core in routers and employ a multi-path transport protocol, like MPTCP, to perform end-to-end parallel transfers