Policy-Based Routing (PBR) is a networking technique used to change the next hop IP address for traffic matching certain predefined policies or rule, rather than relying solely on traditional routing protocols and routing table entries. With PBR, administrators can direct traffic along specific paths according to various factors such as source/destination IP address, source/destination port, or packet attributes.
After the device configures PBR, if the received messages match the rules of the PBR, they are forwarded according to the PBR route; if they fail to match, they are forwarded according to the destination address according to the traditional forwarding process.
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2. Match Rule: Policies in PBR include match rule, which are conditions that incoming packets must meet in order to be subjected to the policy. Match rule includes attributes such as source/destination IP address, source/destination port, and DSCP value.
and is the logical operator between the matching fields with the same sequence number, that is, to be considered to match a PBR rule, the packets must match all the matching fields with the same sequence number.
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