Distributed policy routing method

Abstract

The invention discloses a distributed policy routing method, which relates to the field of data communication and divides an interface of a policy routing device into ports in three types, namely an internal port, an external port and a combined port. The internal port conducts policy selection on accessed packets. The external port is used for transmitting actual packets and selecting whether to use network address translation / port address translation (NAT / PAT) as required. The combined port is used for sending self policy routing configuration information, receiving opposite party policy routing configuration information and transmitting peer policy routing packets. Packets requiring policy routing by an opposite party are sent from the combined port by modifying policy routing information of a peer received from the combined port, the peer conducts local policy routing selection after receiving the packets, and policy routing configuration information exchange between the combined ports, a reconfiguration process of the combined ports and the transmission flow path of the actual packets are achieved. The distributed policy routing method has the advantages of reducing configuration load of network managers and increasing reliability of policy routing.

Description

technical field [0001] The invention relates to the field of data communication, in particular to a distributed strategy routing method. Background technique [0002] In the process of building an enterprise network, it often occurs that the network has multiple outlets, that is, the enterprise network is connected to multiple ISPs (Internet Service Providers). In this case, the most commonly used method is to use policy routing . Policy routing is a more flexible packet routing and forwarding mechanism than routing based on the destination network. Through policy routing, the network border device forwards data packets through the strategy designed in advance by the administrator instead of through the routing table. This method greatly increases the administrator's ability to control the network, and gives priority to the shortest path in the past. Transformed into a way of forwarding data through actual needs. Traditional policy routing is mostly based on the following...

AI Technical Summary

Problems solved by technology

[0005] (2) A single device port is not enough

[0006] (3) The network load is too large, exceeding the performance of a single device

The first case is very easy to implement because no policy interaction between devices is required. The traditional solution to the second case is to add a policy pointing to other border devices at the end of the policy in each border device, and it is necessary to set the inter-device Routing, this method requires the network administrator to carefully consider the routing in the network and the policy routing in each device, which is relatively cumbersome to implement

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