Method and system for implementing data stream hardware forwarding, and network routing device

Abstract

The invention discloses a method and a system for realizing data flow hardware forwarding. A network route device is also disclosed. In the method, a first forwarding table of a hardware forwarding chip is refreshed and a second forwarding table is sent down according to an out interface of an interface board. For business messages which are output by the configured out interface, following steps are executed: the hardware forwarding chip searches the first forwarding table to obtain the next hop of the refreshed route and searches the business messages to CPU of the interface board to be treated by an interface which is connected with the CPU of the interface board; the business messages treated by the CPU of the interface board trigger the hardware forwarding chip to search the second forwarding table to obtain a real next hop, and the three-layer hardware forwarding is implemented on the treated business messages by the out interface. By adopting the method and the system, the hardware forwarding chip forwards data flow to the CPU of the interface board for the business treatment. After the treatment, the three-layer forwarding can be implemented again by the hardware forwarding chip. Simultaneously, the configuration is simple and the forwarding performance is improved.

Description

technical field [0001] The present invention relates to the technical field of network communication, in particular to a method and system for realizing data flow hardware forwarding, and also to a network routing device. Background technique [0002] Most of the current network routing devices (such as switches and routers) adopt a distributed structure, and forward the data stream through the hardware forwarding chip set on each interface board to efficiently complete the forwarding task of the IP layer; among them, the commonly used hardware forwarding chip Including dedicated ASIC (Application Specific Integrated Circuits, application specific integrated circuit) and NP (Network Processing, network processor). [0003] Although the use of hardware forwarding chips can improve the performance of IP layer data stream forwarding, hardware forwarding chips are not suitable for services above the IP layer, such as NAT (Network Address Translation, Network Address Translation)...

AI Technical Summary

Problems solved by technology

This is because the routing and forwarding table information of the hardware forwarding chip on the interface board has been modified. If the hardware forwarding chip continues to perform Layer 3 routing and forwarding, the data stream will be repeatedly sent to the CPU without changing the destination IP, resulting in a trap. Infinite loop; therefore, the CPU whose forwarding table entry has not been modified must perform routing software lookup, and then the hardware forwarding chip performs Layer 2 hardware forwarding;

[0010] The participation of CPU in data flow forwarding also leads to the increase of cost and complexity

Specifically, since the CPU needs to complete the routing lookup of the outgoing interface, this means that the CPU must save the routing table information of the corresponding interface board; one solution is to configure the CPU on all the interface boards and record the route of the interface board. Information, which is obviously not conducive to cost reduction, and is also not conducive to the reuse of old interface boards without CPUs; another solution is to concentrate the routing information of each interface board on the CPU of one or several interface boards, However, in order to support this function, the above-mentioned CPUs must synchronize the global outbound interface Layer 2 information, so there is a complex global interface information synchronization process

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