Link Aggregation Control Protocol on Software Defined Network

Abstract

A physical connection of computer network must be made reliably. Breaking connection will cause communication between nodes (for example routers, switches, hosts) can be disconnected. One of the solutions is implemention of link aggregation (LA). LA integrates several of physical ports together to make a single logical communication link. Accordingly, there is load sharing traffic among the member port of the group, high-throughput increasing via a single link, and redundancy providing for broken links. We present the implementation of link aggregation using Ryu controller on Software Defined Network (SDN [4]. OpenFlow is developed by Open Networking Foundation (ONF) Today, the performance of computer networks is a great concern by the customers. Network performance is influenced by the reliability of the physical network topology. When the physical connection between two nodes is failed, then the packet can not be sent through the link. Otherwise, if a physical connection is a good condition with limited bandwidth, it can cause congestion since several nodes using the link for delivery. This problem can be solved by Link Aggregation (LA). LA is a method that aggregates multiple network connections acts as a single logical interface using software. LA provides redundancy for link failure, for example: if one or more physical interface on a logical aggregate loss, the other physical connection still up and operate. Moreover, LA increases throughput passing through a single link which can reduce bottleneck by allowing packets to be traversed over multiple interfaces. LA is defined in IEEE 802.3ad that allows to group Ethernet interface at the physical layer to form a single link interface, namely Link Aggregation Group (LAG). Link Aggregation Control Protocol (LACP) is a mechanism for changing the port to preserve LAG bundles. LACP provides a dynamic configuration that means the other end can handle link aggregation. In addition, it handles failover automatically when a link failed [1].Software Defined Network (SDN) is a new architecture for a computer network that separates network control and forwarding functions, which allowing the controller can connect directly programmable. SDN's characteristics are manageable, adaptable, scalable, appropriate for high bandwidth, and dynamic features of recent applications compared to traditional network architecture [2]. Hence, users can assign the logical network topology using software, regardless of underlying network structure [3]. In general, SDN

The impact of firewall on TCP and UDP throughput in an openflow software defined network

“…Also in research [23] and [24] the researchers used ONOS controller in mininet software to studies the bandwidth in SDN. The throughput has been tested for linear topology network on using by used link aggregation method [25].In the research [26] TCP observed to evaluate the load balance in data center SDN. There are also further researches that evaluate SDN networks regarding their use of firewall deployment settings [14,16,[27][28][29][30].…”

Métodos de Resiliência em Redes Definidas por Software

“…Outra solução analisada como um método para recuperação rápida em caso de falhas correspondeà implementação da agregação de enlaces por meio do uso do LACP [7], sendo possível integrar várias portas físicas em conjunto para criar umúnico enlace lógico de comunicação.…”

“…Artigos relacionados como [3], [6] e [7] analisam o tempo de recuperação dos métodos de resiliência e de seus respectivos mecanismos, porém não fazem uma análise de desempenho da rede de forma mais profunda. Assim, neste artigoé realizada uma análise de desempenho da rede quantificando o jitter e a perda de pacotes em cenários com falha.…”

“…Já a Figura 2(b) mostra como ocorre a tolerância a falhas em caso de queda de um dos enlaces. O LACP assegura a comunicação confiável por meio de caminhos multiplexados que são usados como caminhos secundários em caso de falhas [7].…”

Effective Router Assisted Congestion Control for SDN

“…By using SDN technology, congestion control utilizes the global knowledge of the network in its decision making. Data monitoring collects network information, and this information is used by the controller to make centralized decisions in response to changing network conditions [22]. This approach produces accurate information so that the sender's sending rate can be customized appropriately according to network conditions.…”