Managing Congestion in Data Center Network using Congestion Notification Algorithms

1Student, Dept. of Computer Engineering, PICT, Pune, India 2Professor, Dept. of Computer Engineering, PICT, Pune, India ---------------------------------------------------------------------***--------------------------------------------------------------------Abstract With the rapid growth in Data Center Network (DCN), many problems are observed by the researchers. These problems are related to its architecture, congestion control and TCP throughput. Nowadays, there is vast improvement in the Data Center Network with respect to Congestion Notification. In today’s scenario Data Center Ethernet (DCE) is mostly used as compared to other technologies. Ethernet is low in cost and primary protocol used in DCN. But this Ethernet technology may also lead to packet drop and low bandwidth utilization, consequently lead to congestion. To solve this problem various Ethernet protocols are being developed to prevent congestion at the switch such as Backward Congestion Control (BCN), Enhanced Forward Explicit Congestion Notification (E-FECN), Forward Explicit Congestion Notification (FECN), Quantized Congestion Notification (QCN), Approximate Fair Quantized Congestion Notification (AFQCN) and Fair Quantized Congestion Notification (FQCN). Among those algorithms QCN is ratified as the formal standard. In this paper, we are going to cover all the aspects of recent research activities in DCNs, in terms of network congestion notification algorithms. We present a brief overview of the congestion problem along with previously proposed solutions.