A method for configuring a telecommunication network (106, 108, 204), the telecommunication network comprising a plurality of nodes, with pairs of nodes being connected by respective links, each link having a respective link capacity, wherein traffic directed over the telecommunication network is associated with one of a plurality of traffic classes, each traffic class having a respective priority value, the method comprising: a) determining an amount of traffic associated with each traffic class flowing on a first link of the telecommunication network; b) for each traffic class, determining a traffic class link capacity, the traffic class link capacity for a particular traffic class varying as a function of a difference between the link capacity of the first link and capacity allocated to other traffic classes on the first link according to a scheduling algorithm based on the priority value of the particular traffic class and the priority values of the other traffic classes; c) for each traffic class, determining a traffic class link criticality of the first link as a function of the respective traffic class link capacity and an amount of traffic associated with the traffic class flowing on the first link; d) determining (306, 600, 800) one or more overall traffic class link criticalities for the first link, the overall traffic class link criticality for a particular traffic class for the first link varying as a function of a sum of the traffic class link criticalities for one or more traffic classes for the first link, the one or more traffic classes including at least the particular traffic class and each traffic class of the plurality of traffic classes for which the traffic class link capacity varies by virtue of the scheduling algorithm and the priority value associated with the particular traffic class; e) repeating steps a) to d) for one or more second links of the telecommunication network; and f) configuring the telecommunication network based on the overall traffic class link criticalities for the first link and the one or more second links. a) determining an amount of traffic associated with each traffic class flowing on a first link of the telecommunication network; b) for each traffic class, determining a traffic class link capacity, the traffic class link capacity for a particular traffic class varying as a function of a difference between the link capacity of the first link and capacity allocated to other traffic classes on the first link according to a scheduling algorithm based on the priority value of the particular traffic class and the priority values of the other traffic classes; c) for each traffic class, determining a traffic class link criticality of the first link as a function of the respective traffic class link capacity and an amount of traffic associated with the traffic class flowing on the first link; d) determining (306, 600, 800) one or more overall traffic class link criticalities for the first link, the overall traffic class link criticality for a particular traffic class for the first link varying as a function of a sum of the traffic class link criticalities for one or more traffic classes for the first link, the one or more traffic classes including at least the particular traffic class and each traffic class of the plurality of traffic classes for which the traffic class link capacity varies by virtue of the scheduling algorithm and the priority value associated with the particular traffic class; e) repeating steps a) to d) for one or more second links of the telecommunication network; and f) configuring the telecommunication network based on the overall traffic class link criticalities for the first link and the one or more second links.