Abstract: A method for dynamically modifying quality-of-service tags for multiple data flows is disclosed. In one embodiment, such a method determines current bandwidth utilization for each of multiple data flows passing through a network, and determines acceptable bandwidth utilization for each of the multiple data flows. The method receives external information that, based on one or more rules, is used to adjust quality of service priorities for one or more of the data flows. Based on the external information, the method dynamically adjusts quality-of-service tags for data packets associated with the data flows, such that current bandwidth utilization is altered for at least one data flow of the multiple data flows without violating acceptable bandwidth utilization for each of the multiple data flows. A corresponding system and computer program product are also disclosed.