(The so-called policy routing, as the name implies, is to forward packets based on certain policies. Therefore, policy routing is a more flexible routing mechanism than destination routing (ordinary routing). When a router forwards a data packet, it first filters the packet based on the configured rules. If the match is successful, the packet is forwarded according to a certain forwarding policy. This kind of rule can be based on standard and extended access control lists, or based on the length of the packet; while the forwarding policy is to control the packet to be forwarded according to the specified policy routing table, and it can also modify the IP priority field of the packet. Therefore, policy routing is an effective enhancement to the traditional IP routing mechanism.)
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