Exemplified Study of WRED Algorithm Parameters Influence on IP-based Networks

Abstract

Within the TCP/IP model, if the transport layer of multiple machines send too many packets at high speed, the network will be quickly overloaded and productivity of the system will sharply fall causing delay and packet loss. Congestion control, aimed at combating such situations requires collaboration between the network and transport layers. Since overload occurs on routers, their discovery has been on the side of network layer of TCP/IP protocol stack. However the reason for congestion is the traffic transmitted by the transport layer. Therefore, the only effective way to control congestion is slower packet transmission by transport protocols and algorithms. Weighted random early detection (WRED) is a queuing discipline for a network scheduler suited for congestion avoidance. It has an advantage in comparison with other congestion control techniques, but at the same time requires very correct settings. This paper examines the algorithm of the selecting the correct setting for the WRED algorithm on the example of the widespread corporate networks.