Distributed data communication system and its multicast message forwarding method

Abstract

The invention discloses a distributed data communication system and a multicast message forwarding method thereof. The system includes a main control card, a switch matrix and a line card; the switch matrix is ​​set with records corresponding to each line card combination and the second-layer address The static multicast table of the rules, the same corresponding rules and the corresponding relationship between the multicast forwarding table and the interface and the line card are also set on the line card; after the line card receives the multicast message from the outside, it queries the records in the multicast forwarding table The corresponding forwarding interface combination, and determine the corresponding line card combination, and then determine the corresponding layer 2 address, encapsulate the layer 2 address into a multicast message and send it to the switch matrix; the switch matrix queries the corresponding line card according to the layer 2 address Combining, forwarding the multicast message to the corresponding line card; after the corresponding line card receives the multicast message from the switch matrix, sends the multicast message through the interface of the line card. Utilizing the present invention, higher multicast forwarding performance of the distributed data communication system can be realized with lower cost.

Description

technical field [0001] The invention relates to the technical field of data communication, in particular to a distributed data communication system and a multicast message forwarding method thereof. Background technique [0002] A significant disadvantage of traditional centralized data communication equipment is that the central processing unit (CPU) needs to process control messages and data messages at the same time. Although the multi-core CPU separates the control function from the data processing function to a certain extent, the forwarding capability of the whole machine Limited by CPU performance, it is difficult to carry out some businesses with large traffic and multiple receivers. [0003] Distributed data communication equipment physically separates the control plane and data plane into control equipment and data equipment, while improving control performance and data forwarding performance, and the forwarding capability of the whole machine is proportional to th...

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Problems solved by technology

[0007] However, since this solution needs to maintain the dynamic forwarding rule table on the switch matrix card, this dynamic forwarding function needs to be added to the software of the switch matrix card, and the forwarding of the switch matrix card belongs to hardware forwarding, and the scale of forwarding rule entries depends on the size of the hardware The specifications are limited, so the number of multicast entries supported by the whole machine is limited by the size of the forwarding rule entries of the switch matrix card. To support the number of multicast entries of the whole machine, a high-specification hardware switching chip is required, which costs a lot. high

In addition, the (S, G, V) forwarding rule table is recorded in the switch matrix card, which means that the switch chip needs to support multicast IP forwarding, and the cost of this switch chip is also very high

If you use a conventional switching chip that supports Layer 2 address (MAC address) multicast forwarding, although the cost is reduced, due to the 32-to-1 relationship between the IP address and the MAC address, and the MAC forwarding does not recognize the source address, it will cause incorrect forwarding. Accurate, poor forwarding performance

Finally, this solution occupies more bandwidth resources due to the need for control packet interaction between the switch matrix card and the line card

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