Issues in preemption policies

Even though preemption mechanisms may be used to reduce the total number of rejected tunnels in case of failure in a MPLS network, they can also have a negative impact on the convergence time of a network. N Chaieb et al., 2007, two approaches are proposed:

• Least preempted tunnels are prioritized for next preemption. 
• No tunnel can be preempted more than N times in a given interval of time. 

Chaieb et al., 2007c] Chaieb, I., Le Roux, J., et Cousin, B. A New Pre-emption Policy for MPLS-TE Networks. 15th IEEE International Conference on Networks (ICON) (2007c).