10 Traffic Engineering

Traffic engineering and fast reroute are the two major applications of constraint based routing Traffic engineering is the process of controlling how traffic flows through a service provider’s network so as to optimize resource utilization and network performance[1]. Traffic engineering is needed in the Internet mainly because the shortest path is used in current intradomain routing protocols (e.g., OSPF, IS-IS) to forward traffic. The shortest path routing may give rise to two problems.