Quality of Service in Software Defined Network: Leveraging OpenFlow Protocol

The research community has been showing an increasing amount of interest in the topic of Quality of Service (QoS) in computer networks. Now a days maximum network applications expect specific QoS assurance. In essence, Quality of Service (QoS) is essentially the capability of the network to provide the resources to satisfy the requirements of specific traffic. For instance, while streaming video there can be slight delay and when communicating data a lower packet loss rate is considered. The IETE had defined QoS architectures – IntServ and DiffServ. But both are not very much effective in supporting QoS for both end users and service providers. The Software Defined Networks (SDN) aims to increase network performance by using the facility of QoS which is available in OpenFlow. The paper briefs the QoS in conventional networks, along with a some study of OpenFlow with respect to QoS in SDN [1]. Additionally, this paper discusses the QoS abilities of SDN controllers which are commonly used.