In this article, use of interdiction models in evaluating the robustness of two echelon supply chain is
demonstrated. Robustness as performance measure is used for a supply chain which is required to operate under risk
of disruptions and uncertainty. Most of the Operation Research models design supply chain for efficiency (cost
minimization or profit maximization). These supply chains needs to be further evaluated for the effect of their
vulnerabilities. An interdictor to the supply chain is formulated mathematically with service level constraints, whose
objective is to disrupt the supply chain maximally under the risk of global disruptions. For a robust supply chain, it
will not have any feasible solution. Later, an algorithm to find a feasible solution to the problem, if it exists, is given.
Further an expression to measure robustness and to use of strategic inventory reserves for fortifying the network is
given. A problem instance is also solved to demonstrate these results. It is intended to later extend these results to
generic case of multi-echelon supply chain by relaxing various assumptions of this model.