Method and system for converging multicast network and multicast forwarding device

Abstract

The invention discloses a multicast network convergence method, a system and a multicast forwarding device, which relate to IGMP protocol in multicast network and solve the problem that in the prior art, when the relation of multicast group and multicast members thereof is changed, the bandwidth for data transmission in multicast network convergence process is greater; the multicast network convergence method includes the following steps: when a multicast group or multicast member in the multicast group quits, a node connected with the multicast forwarding device which includes the multicast group sends global departure messages to all multicast groups in the multicast forwarding device; the multicast forwarding device sends general inquiry message to all multicast groups for inquiring if each multicast group has multicast members; the multicast forwarding device deletes the multicast groups without multicast member. The invention is applicable to equipments supporting IGMP protocol.

Description

technical field [0001] The invention relates to the Internet Group Management Protocol (IGMP) in the multicast network, in particular to a method and system for multicast network convergence and a multicast forwarding device after a multicast member leaves the multicast group. Background technique [0002] Multicast technology realizes efficient data transmission from point to multipoint in the network. After adopting multicast technology, the source server only needs to transmit a multicast data message to the backbone network, and the multicast data message is transmitted through the backbone network. When it reaches the access device directly connected to the user, it is copied into multiple data packets and sent to different users. Multicast technology greatly reduces the occupation of network bandwidth during data transmission, effectively reduces the load on the backbone network and source server, and reduces the possibility of data congestion on the backbone network. ...

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Problems solved by technology

[0015] Although, the above TR-101 has extended the leave message in IGMP version 2, and proposed the concept of GlobalLeave message, so that when the host leaves multiple multicast groups at the same time, it only needs to send one GlobalLeave message to all multicast groups. However, in the process of implementing the present invention, the inventor found that the TR-101 provided by the prior art has the following problems: after the aggregation node and / or the multicast router receive the Global Leave message, they need to send Each group that the host leaves from sends a specific group query message. When a host leaves multiple multicast groups at the same time, during the convergence process of the multicast network, the aggregation node and / or multicast router needs to send Multiple multicast groups send specific group query messages, occupying a large amount of downlink bandwidth; and, after the multicast network topology changes, the aggregation node and / or the interface of the multicast router that receives the Global Leave message may not have any Group membership (multicast group), according to the regulations in IGMP version 2, will cause the aggregation node and / or multicast router to ignore the Global Leave message, so that the aggregation node and / or multicast router cannot send A specific multicast group sends a specific group query message, causing a convergence failure on the multicast network

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