Traditional routing is destination-based, meaning packets are routed based on destination IPaddress. However, it is difficult to change the routing of specific traffic in a destination-based routing system. With Policy Based Routing (PBR), you can define routing based on criteria other than destination network—PBR lets you route traffic based on source address, source port, destination address, destination port, protocol, or a combination of these.
Policy Based Routing :
* Lets you provide Quality of Service (QoS) to differentiated traffic.
* Lets you distribute interactive and batch traffic across low-bandwidth, low-cost permanent paths and high-bandwidth, high-cost switched paths.
* Allows Internet service providers and other organizations to route traffic originating from various sets of users through well-defined Internet connections.
Policy Based Routing can implement QoS by classifying and marking traffic at the network edge, and then usingPBR throughout the network to route marked traffic along a specific path. This permitsrouting of packets originating from different sources to different networks, even when the destinations are the same, and it can be useful when interconnecting several private networks.
