Multi-cast transmission method based on virtual distribution network in IP network

Abstract

The present invention relates to multi- broadcast transmitting method in IP network which belongs to computer communication technology field. The method includes: first, a virtual distributing net is established in IP network for each multi- broadcast conversation, the virtual distributing net is made up of multi- broadcast conversational main station and route device with multi- broadcast function connected by virtual chain circuit, and is with the only virtual distributing net identification; then, transmitting main station transmits multi- broadcast data pack to all receiving main station adopting broadcast modus in the virtual distributing net. On one hand, the present invention has original excellence of multi- broadcast conveying method based on virtual distributing net, such as supporting network layer multi- broadcast dispose with step by step, supporting multi- broadcast data pack bidirectional conveying etc, on the other hand, simplifying virtual distributing net configuring, supporting large scale multi- broadcast application through broadcast mechanism, guarantying multi- broadcast data pack conveying rightly.

Description

technical field [0001] The invention belongs to the technical field of computer communication, in particular to a multicast (Multicast) transmission method in an IP network. Background technique [0002] Multicast is an efficient point-to-multipoint or multipoint-to-multipoint transmission method. At present, the main services provided in the IP network, such as information retrieval, e-mail, instant messaging, etc., are based on the unicast transmission (that is, point-to-point transmission) technology of establishing data packets. However, many emerging services, such as Internet TV (IPTV), large-scale network conferencing, and large-scale distributed simulation, involve the simultaneous interaction of a large number of computers. If unicast is still used, a large amount of network bandwidth resources will be wasted, and performance is difficult to guarantee. Multicasting provides an effective point-to-multipoint and multipoint-to-multipoint transmission mechanism, which ...

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Problems solved by technology

[0005] However, there is a problem in the above multicast scheme: there is a problem of scalability in the configuration of the distribution table, which is mainly caused by the use of a set of forwarding authority flags to control the transmission of multicast data packets

The forwarding permission flag set guides the multicast data packet from the sending user host to all receiving user hosts. When the forwarding permission flag configuration is correct, the multicast data packet can be transmitted correctly. However, if the forwarding permission flag set appears in the configuration If there is a problem, it will cause the transmission failure of the multicast data packet, such as a loop (Loop), that is, the data packet is repeatedly transmitted in the network

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