Traffic Engineering Using Overlay Network
Due to integrated high-speed networks accommodating various types of services and applications, the Quality of Service (QoS) requirements for those networks have also become diverse. The network resources are shared by the individual service traffic in the integrated network. Thus, the QoS of all the services may be degraded indiscriminately when the network becomes congested due to a sudden increase in traffic for a particular service if there is no traffic engineering taking into account each service's QoS requirement. To resolve this problem, the authors present a method of controlling individual service traffic by using an overlay network, which makes it possible to flexibly add various functionalities.