Distributed data communicating system and multicast message transmitting method thereof

Abstract

The invention discloses a distributed data communicating system and a multicast message transmitting method of the distributed data communicating system. The distributed data communicating system comprises a master control card, a switching matrix and line cards. A static multicast table which records the correspondence rules between line card combinations and second-layer addresses is arranged on the switching matrix, and the same correspondence rules, the multicast transmitting table and the correspondence relations between interfaces and the line cards are also arranged on the line cards. After receiving an external multicast message, the line cards inquire a corresponding transmitting interface combination recorded in the multicast transmitting table, determine a corresponding line card combination and then determine a corresponding second-layer address, the second-layer address is packaged to the multicast message and then the multicast message is sent to the switching matrix. The switching matrix transmits the multicast message to a corresponding line card according to the corresponding line card combination obtained through the query of the second-layer address, and the corresponding line card sends the multicast message through the interface of the line card after receiving the multicast message from the switching matrix. By the utilization of the distributed data communicating system and the multicast message transmitting method of the distributed data communicating system, high multicast transmitting performance of the distributed data communicating system can be realized at a low 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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