Estratégias para resiliência em SDN: uma abordagem centrada em multi-controladores ativamente replicados

• Autor(a) principal: Spalla, Eros Silva
• Data de Publicação: 2015
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Repositório Institucional da Universidade Federal do Espírito Santo (riUfes)
• Texto Completo: http://repositorio.ufes.br/handle/10/4287
• topic: OpenFlow; High-AvailabilityResilience; SDN; Redes definidas por software (SDN); OpenFlow (Protocolo de rede de computador); Alta-disponibilidade; Ciência da Computação; Resiliência (Traço da personalidade); 004

Software Defined Networking (SDN) are based on the separation of control and data planes. The SDN controller, although logically centralized, should be effectively distributed for high availability. Since the specification of OpenFlow 1.2, there are new features that allow the switches to communicate with multiple controllers that can play different roles – master, slave and equal. However, these roles alone are not sufficient to guarantee a resilient control plane and the actual implementation remains an open challenge for SDN designers. In this paper, we explore the OpenFlow roles for the design of resilient SDN architectures relying on multi-controllers. As a proof of concept, a strategy of active replication was implemented in the Ryu controller, using the OpenReplica service to ensure consistent state among the distributed controllers. The prototype was tested with commodity RouterBoards/MikroTik switches and evaluated for latency in failure recovery, switch migration and packet-in latency with different workloads. We observe a set of trade-offs in real experiments with varying workloads at both data and control plane.