[pt] A crescente demanda por aplicações em tempo real tem aumentado a necessidade de fornecimento de QoS na Internet. A arquitetura de Serviços Diferenciados (DiffServ) é uma proposta apresentada pelo IETF para suprir a qualidade de serviço necessária. Resultados de pesquisas, mostram que os componentes da arquitetura DiffServ não distribuem de forma justa os recursos da rede. Este trabalho tem como objetivo propor um mecanismo de marcação de tráfego capaz de melhorar a justiça no compartilhamento da largura de faixa excedente entre agregados de tráfego. O algoritmo de marcação proposto é comparado com os marcadores trTCM, tswTCM e ItswTCM em relação a justiça em diferentes cenários de simulação. Os resultados mostram que o algoritmo proposto apresenta desempenho superior em uma rede com carga de utilização variando entre 20% e 60%. / [en] Recent demand for real time applications has given rise to a need for Quality of Service (QoS) in the Internet. Differentiated Services (DiffServ) is one of such efforts currently pursued by IETF. Previous researchers found unfairness in DiffServ networks. The objective of this work is to propose a new marker which achieves proportional fair sharing of excess bandwidth among aggregates. The proposed algorithm is compared with the following markers trTCM, tswTCM e ItswTCM. Results show that the proposed marker performs better than the other three schemes for network provision level between 20% and 60%.

The aim of my diploma is to introduce the SNMP protocol designed for remote device management to the readers and present its implementation into the Opnet Modeler simulation environment. For the implementation the DiffServMIB database has been chosen, which describes the components of differentiated services mechanism. My diploma thesis describes in detail the possibilities of application of the DiffServMIB database in traffic management. The design of a simulation model, which represents the differentiated data processing in input and output direction on a router interface, is also introduced. Next, this model is implemented into the Opnet Modeler simulation environment. The goal of this simulation model is the possibility of simple configuration of individual MIB attributes. In my work I also suggest an implementation method able to interconnect the MIB database with the configuration process of the active network element - with focus on output procedures of DiffServ mechanism.

Tato práce se zabývá technologií Multiprotocol Label Switching a to zejména moderními metodami, které je možné použít v rámci této technolologie. Jako příklad lze uvést využití podpory kvality služeb při směrování. V práci jsou navrhnuty a simulovány různé topologie a scénáře, které ověřují možnosti využití MPLS v podpoře kvality služeb.