Branch and Bound VRP has zero nodes

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I'am trying to solve the VRP with Gurobi and therefore analyse the branch-and-bound tree, but Gurobi solves the problem in the root and doesn't use branch-and-bound (0 nodes explored). Is there a possibility to start the algorithm without presolving?

Thanks for your help!

operations-research gurobi mathematical-optimization
1 Answers

You can turn off presolving using the Presolve parameter.

However, note that your problem may still be solved in the root node; branching is only necessary if you cannot find an optimal integral solution in the root node.

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