Overview PBR

The PBR (policy-based routing) is a routing mechanism for forwarding the packets based on the user-defined policy. When the packet is forwarded in the route, the packet can be matched based on the ACL rule, such as the IP protocol number, source IP address, destination address, and the length. For the packets that match the matching rules, destination IP address, source TCP/UDP port number, destination TCP/UDP number, packet priority, and TCP identifier. For the packets satisfying the matching rule, perform the operation according to the specified policy. (set the next hop for the packet) In this way, forwarding control of the packets is implemented.

Traditional routing forwards packets only based on the destination addresses. Compared with the traditional routing, the PBR is more flexible. It is an effective supplement to and enhancement of the traditional routing mechanism.