Method for realizing layer-two forwarding of multicast flow, apparatus and system thereof

Abstract

The invention provides a method for realizing layer-two forwarding of multicast flow, an apparatus and a system thereof. The method comprises the following steps: routing equipment acquires a multicast flow acquisition request; an adding message is generated when the routing equipment identifies that an address of a multicast source and self-address belong to the same network according to the multicast flow acquisition request, and an upstream neighbor address of the adding message is set as the self-address of the routing equipment; and the routing equipment sends the adding message according to the multicast source address so that switching equipment between the routing equipment, and the multicast source can record a port receiving the adding message in a multicast output list of a local forwarding table by snoop. In the technical proposal of the invention, direction connection between the source and the equipment causes construction of a special message and sends the message afterreceiving the multicast flow acquisition request, so that the switching equipment can snoop and record the port with the multicast flow acquisition request, and accurate layer-two forwarding can be realized during the multicast flow forwarding.

Description

technical field [0001] Embodiments of the present invention relate to computer network communication technologies, and in particular to a method, device and system for realizing layer-2 forwarding of multicast streams in a virtual local area network including multicast sources. Background technique [0002] Unicast, broadcast, and multicast are three common forms of IP packet transmission in computer networks. The so-called multicast is a form of single-point transmission and multi-point reception. The sender will send an IP packet to a reserved multicast group address, and only the receivers who join the multicast group can receive the multicast IP packet, which greatly reduces the The load on the network and the burden on the sender are reduced. [0003] The Sparse Mode Protocol Independent Multicast-Sparse Mode (PIM-SM for short) protocol is one of the commonly used routing protocols in the multicast technology. figure 1 It is a schematic diagram of a multicast network ...

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Problems solved by technology

[0014] The defect of IGMP snooping technology is: by default, each PIM router connected to other PIM routers and PCs needs multicast streams, so each router connection port can receive multicast streams of any group, but in fact not all three layers All devices have the requirement to receive the data streams of these multicast groups

[0016] But, in realizing the research process of the present invention, the inventor finds that there is following defect in existing PIM snooping technology: in the PIM-SM protocol network, the device directly connected to the source does not need to send the join message, so even if it contains the multicast source PIM snooping technology is deployed in VLAN, and the ports connected to the routers that require multicast streams cannot be snooped out.

In the prior art, broadcasting is usually used to send multicast streams in VLANs containing multicast sources, and it is difficult to achieve precise forwarding of Layer 2 ports

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