Multicast data transmission method and apparatus

Abstract

The invention provides a multicast data transmission method and apparatus. The method comprises steps that a network device receives a reverse path query message sent from a multicast receiver to a multicast source and forwards the reverse path query message to the multicast source, wherein the reverse path query message carries multicast source information and multicast group information; the network device updates a multicast routing list by means of the reverse path query message, wherein the multicast source information of the multicast routing list is the multicast source information carried in the reverse path query message, the multicast group information of the multicast routing list is the multicast group information carried in the reverse path query message, and the forward interface of the multicast routing list includes an interface receiving the reverse path query message; the network device forwards multicast data by means of the forward interface of the multicast routing list when receiving the multicast data matching the multicast source information and the multicast group information in the multicast routing list. The method and the apparatus prevent a waste of bandwidth resources and save the processing cost of the multicast receiver.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to a method and device for transmitting multicast data. Background technique [0002] Such as figure 1 As shown, it is a schematic diagram of a network of a video surveillance system. In a video surveillance system, an NVR (Network Video Recorder, Network Video Recorder) usually manages multiple IPCs (IPCamra, Network Camera). When configuring the multicast group address, NVR can configure the multicast group address of all IPCs as the same address, and configure different port numbers for different IPCs, thus simplifying the multicast configuration of IPCs. For example, the NVR configures the multicast group addresses of IPC1, IPC2, IPC3, and IPC4 as IP address 228.1.1.1, but configures ports 50001, 50002, 50003, and 50004 for these four IPCs respectively. [0003] Assuming that 4 IPCs (multicast sources) correspond to the same DR1 (DesignatedRouter, designated rout...

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Problems solved by technology

[0004] Since all the multicast data corresponding to the multicast group address 228.1.1.1 includes multicast data 1, multicast data 2, multicast data 3 and multicast data 4, and PC1 only wishes to request multicast data 1 from IPC1, the router The process of R1, router R2 and DR2 forwarding 4 copies of multicast data will waste bandwidth

Moreover, PC1 needs to filter out multicast data 2, multicast data 3 and multicast data 4 from the received multicast data 1, multicast data 2, multicast data 3 and multicast data 4, which increases the processing of PC1 overhead

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