What is PfRv3?
Performance Routing Version 3 (PfRv3) represents the third generation of enhancement to the intelligent path control capabilities offered by Cisco. PfR monitors network performance and selects the best path for each application based upon advanced criteria such as reachability, delay, jitter and packet loss. PfR can evenly distribute traffic to maintain equivalent link utilization levels using an advanced load balancing technique.
PfRv3 is an intelligent path control of the IWAN initiative and provides a business-class WAN over Internet transports. PfR allows customers to protect critical applications from fluctuating WAN performance while intelligently load balancing traffic over all WAN paths.
PfR comprises two major Cisco IOS components:
Primary Controller—The primary controller is a policy decision point at which policies are defined and applied to various traffic classes that traverse the border router systems. The primary controller can be configured to learn and control traffic classes on the network.
Border Routers (BR)—The border routers are in the data forwarding path. The border router collects data from the Performance Monitor cache and from the smart probe results. The border router influences the packet forwarding path as directed by the primary controller to manage user traffic.