Comparative Analysis of Drop Tail, Red and NLRED Congestion Control Algorithms Using NS2 Simulator

Abstract

Congestion in a network may occur when the load on the network is greater than the capacity of the network and consequently, performance degrades. Congestion control is a technique and mechanisms that can either prevent congestion before it happens, or remove congestion after it has happened. This work presents a comparative analysis of Drop Tail, RED and NLRED congestion control algorithm and performed a simulation experiment to show their relative effectiveness. The experiment was done using NS2 simulator on the basis of Endto-End Delay, Throughput, Packet Drop, and Packet Delivery Ratio in a wired network. The simulation result showed that NLRED performs best in high congestion network, while in low cohesive network, Drop Tail gives a good result. Drop Tail, RED and NLRED was also analysed in real audio traffic and the entire results showed that in congested network, NLRED and RED are better while in low congested network Drop Tail is better. This is because in heavy congested network, congestion avoidance mechanism aids the network to gain better performance while in low congested network unnecessary computation avoidance mechanisms degrades the performance of the network. If parameters are set effectively in RED, it will be the best queuing mechanism for that particular network. However, it is of great importance to know which congestion control mechanism is suitable for each network and traffic.

Congestion Avoidance using Traffic Load Balancing (CATLB) in Computer Networks

“…The OMNeT++ simulator is use a graphical user interface that buld on C++ program languge. The proposed methods using simulate the computer networks (CN1, CN2) as shown in Figures (7) and (9). Figures (8) We notice from figure 10 that the nodes that have more links consume more of their resources, as is the case in the node_3_2 that handles five packets.…”

Traffic Load Balancing based on Congestion Avoidance (TLBCA) in high-speed computer networks

“…Congestion is a great significant issue in computer networks that is may affect negatively the networks, which leads to slowness networks and reduced QoS (Quality of Service), and even stop it in many cases. It occurs when a network node or link is carrying more data than it can be handled and the load on the network is greater than the capacity of the network [1], in another word it occurs when more data is sent to the network than the network can handle [2] [3].…”