Method for establishing virtual distribution network for multicast conversation in IP network

Abstract

The invention relates to a method for establishing virtual distributing network for multicast conversation in IP network, belonging to the technical field of computer communication. The method comprises: a sponsor of multicast conversation raises the request of establishing multicast conversation to the multicast conversation management server in network; once the multicast conversation management server receives the request, an original virtual distributing network is established for the multicast conversation and the identification is returned to the sponsor of multicast conversation; the sponsor of multicast conversation further informs the user host attending multicast conversation of the virtual distributing network identification; every user host attending the multicast conversation can be added to the virtual distributing network by positive or negative manner. The invention simplifies the structure of the virtual distributing network, supports the automatic establishment of the virtual distributing network, supports the management to multicast conversation by network operators, supports multicast progressive deployment and ensures the performance of multicast transmission.

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

[0007] Second, this manual method cannot adapt to the dynamic nature of user hosts.

However, in an actual multicast session, user hosts dynamically join and exit, which means that network administrators need to adjust the virtual distribution network according to the dynamic joining and exit of user hosts, which will bring huge losses to network administrators. workload, and there is no guarantee that the virtual distribution network can quickly adapt to changes in user hosts

[0008] In addition, there is another problem in the above-mentioned patent (application number 200710099365.4). Since the forwarding permission flag set is used to control the transmission of multicast data packets, each node on the virtual distribution network needs to configure a maximum A set of forwarding permission flags with a scale of N×N bits, where N is the number of virtual neighbors of the current node, which not only increases the storage space occupied by the distribution table items, but also increases the complexity of the establishment of the virtual distribution network, especially When the scale of the virtual distribution network is large

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