What is Oscillation

Congestion is derived from insufficient network resources and unbalanced traffic distribution. To treat today’s greedy applications, adding more bandwidth to networks is not the solution for solving the congestion problems in the long term. There are two main approaches to improve quality of service (QoS) of actual network: QoS routing and traffic engineering (Wang, 2001). QoS routing searches the paths by constraint-based routing for better delivery of traffic and is serviced to attract more customers, while traffic engineering aims to reduce congestions and to improve resource utilization through the network by carefully managing the traffic distribution inside a network (Wang, 2001).