In oblivious routing, a robust routing for a class of traffic demand is computed, and thus has the potential to handle traffic spikes well. A potential drawback of oblivious routing is that optimizing for the worst-case performance may incur a high cost when traffic is predictable and stable, which may account for a majority of time.
——Engineering Traffic Uncertainty in the OpenFlow
Data Plane

The oblivious method may have the over-provisioning
problem if they attempt to fully cover real-time traffic spikes
with fixed bandwidth reservation in their offline approach