Policy-based routing (PBR) is a technique that forwards and routes data packets based on policies or filters. Network administrators can selectively apply policies based on specific parameters such as source and destination IP address, source or destination port, traffic type, protocols, access list, packet size, or other criteria and then route the packets on user-defined routes.
The goal of PBR is to make the network as agile as possible. By defining routing behavior based on application attributes, PBR provides flexible, granular traffic-handling capabilities for forwarding packets. In this way, PBR enables network administrators to achieve optimal bandwidth utilization for business-critical applications.