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Advisor(s)
Abstract(s)
O presente trabalho tem como objetivo a melhoria de QoS da rede MPLS do IPL. O IPL inclui 8 unidades orgânicas, entre as quais se inclui o ISEL, os serviços centrais e os serviços sociais. Estas entidades encontram-se disseminadas pela cidade de Lisboa e na Amadora, estando todas elas interligadas através de uma rede de fibra ótica onde se ligam os routers PE que dão suporte à WAN do IPL e que utilizam o protocolo MPLS com distribuição das suas labels através de LDP.
Foram desenvolvidas duas soluções, ambas com intuito de permitir o balanceamento da rede, de forma a maximizar a utilização dos recursos e melhorar a sua resiliência. Estas soluções foram testadas no laboratório da Alcatel-Lucent no ISEL.
A primeira solução utiliza o protocolo RSVP-TE com a reserva de largura de banda para balancear dinamicamente a rede. Foram disponibilizados 100 Mb/s em cada ligação e cada LSP reservou 10 Mb/s. Como resiliência foi utilizado o FRR facility.
A segunda solução utiliza o protocolo RSVP-TE com admin-groups para balancear “manualmente” a rede. Como resiliência foram utilizados Hot-standby secondary-path controlados através de restrições de admin-groups contrárias às aplicadas no primary-path. Foi ainda implementada uma versão alternativa que inclui o FRR facility.
Foram alvos de testes as configurações desenvolvidas e a configuração operacional existente na rede MPLS do IPL. Estes tiveram como objetivo medir a largura de banda, latência, jitter e o tempo de recuperação de uma falha de rede. Os resultados da largura de banda, latência e jitter não demonstraram diferenças significativas, tal como esperado. Os resultados do tempo de recuperação de falhas em ligações ponto-a-ponto mostraram que as configurações desenvolvidas conseguem recuperar 10 vezes mais rápido que a configuração atualmente em operação. Conclui-se que as configurações desenvolvidas melhoram o balanceamento e a resiliência da rede MPLS do IPL.
The present work aims to improve the QoS of IPL MPLS network. The IPL comprises 8 organic units, including ISEL, central services and social services. These units, located in Lisbon and Amadora, are interconnected through a network of optic fiber that can include multiple PE routers in each location. This MPLS network uses the LDP protocol for label distribution. In order to improve the QoS parameters, two solutions were developed with the goal of achieving a balanced network and also improved resilience. The solution were tested in the Alcatel-Lucent laboratory, at ISEL. The first solution uses the RSVP-TE protocol with bandwidth reservation to dynamically balance the network. Each connection provided 100 Mb/s for reservation and each LSP reserved 10 Mb/s. The resilience was achieved using FRR facility. The second solution uses the RSVP-TE protocol with admin-groups to manually balance the network. The network resilience was secured with a secondary-path hot-standby controlled through admin-groups constraints. It was also implemented an alternative version that includes the FRR facility. The tests were performed using the developed configurations and the operational configuration in IPL MPLS network. The purpose of these tests was to measure the QoS parameters, bandwidth, latency, jitter and the recovery time on a network failure. Overall the results of bandwidth, latency and jitter were similar in all the configurations, as expected. The results obtained on the recovery time during a network failure in point-to-point connections have shown that the developed configurations were able to recover 10 times faster than the operational configuration. In conclusion, the developed configurations were capable of an improvement on the network balance and resilience, resulting in an upgrade of QoS in IPL MPLS network.
The present work aims to improve the QoS of IPL MPLS network. The IPL comprises 8 organic units, including ISEL, central services and social services. These units, located in Lisbon and Amadora, are interconnected through a network of optic fiber that can include multiple PE routers in each location. This MPLS network uses the LDP protocol for label distribution. In order to improve the QoS parameters, two solutions were developed with the goal of achieving a balanced network and also improved resilience. The solution were tested in the Alcatel-Lucent laboratory, at ISEL. The first solution uses the RSVP-TE protocol with bandwidth reservation to dynamically balance the network. Each connection provided 100 Mb/s for reservation and each LSP reserved 10 Mb/s. The resilience was achieved using FRR facility. The second solution uses the RSVP-TE protocol with admin-groups to manually balance the network. The network resilience was secured with a secondary-path hot-standby controlled through admin-groups constraints. It was also implemented an alternative version that includes the FRR facility. The tests were performed using the developed configurations and the operational configuration in IPL MPLS network. The purpose of these tests was to measure the QoS parameters, bandwidth, latency, jitter and the recovery time on a network failure. Overall the results of bandwidth, latency and jitter were similar in all the configurations, as expected. The results obtained on the recovery time during a network failure in point-to-point connections have shown that the developed configurations were able to recover 10 times faster than the operational configuration. In conclusion, the developed configurations were capable of an improvement on the network balance and resilience, resulting in an upgrade of QoS in IPL MPLS network.
Description
Dissertação para obtenção do grau de mestre em Engenharia de Electrónica e Telecomunicações
Keywords
Análise de rede Network analysis Topologia de rede Network topology MPLS Instituto Politécnico de Lisboa
Citation
DIONÍSIO, João Eusébio - Qualidade de serviço em redes avançadas. Lisboa: Instituto Superior de Engenharia de Lisboa, 2018. Dissertação de mestrado.
Publisher
Instituto Superior de Engenharia de Lisboa