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Method and equipment for multicast forwarding

A multicast and device technology, applied in the field of communication, can solve problems such as resource waste and data flooding

Active Publication Date: 2013-07-17
NEW H3C TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] The embodiment of the present invention provides a method and device for multicast forwarding, which solves the problem of data flooding and resource waste caused by sending multicast data packets to the DR on the multicast source side only through broadcasting in the existing layer-2 networking multicast technology The problem

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  • Method and equipment for multicast forwarding
  • Method and equipment for multicast forwarding

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Embodiment Construction

[0079] Such as image 3 As shown, it is a schematic flow diagram of a method for multicast forwarding proposed by the present invention, and the method specifically includes the following steps:

[0080] Step S301 , the access switching device directly connected to the multicast source receives the multicast data flow sent by the multicast source, and inquires whether there is a corresponding PIM-Snooping routing entry stored locally.

[0081] If the query result is no, then execute step S302;

[0082] If the query result is yes, the access switching device judges whether the PIM-Snooping routing entry currently has a downstream port;

[0083] If it does not exist, the access switching device stops forwarding the multicast data flow downstream;

[0084] If it exists, send the multicast data flow to the corresponding downstream adjacent routing device through the downstream port, so that the downstream adjacent routing device forwards the multicast data flow to the downstream...

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Abstract

The embodiment of the invention discloses a method and equipment for multicast forwarding. According to the technical scheme, the method comprises the following steps of: enabling protocol independent multicast (PIM)-Snooping on a switch in data source networking, establishing a PIM-Snooping routing table entry which is not added with a downstream port, adding / pruning message according to PIM sent by downstream adjacent routing equipment, and adding or deleting the downstream port for the PIM-Snooping routing table entry to control whether to forward multicast data stream to the downstream or not, so that the multicast data stream is transmitted to the downstream adjacent routing equipment only when a downstream user has a receiving demand. If downstream users do not need to receive the multicast data stream, the multicast data stream is only transmitted to access switching equipment and is not continuously transmitted to the downstream adjacent routing equipment, so that the aims of saving network bandwidth and preventing the multicast traffic from flooding are fulfilled.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to a method and equipment for multicast forwarding. Background technique [0002] As a communication method in parallel with unicast (Unicast) and broadcast (Broadcast), multicast (Multicast) technology can effectively solve the problem of single-point transmission and multi-point reception, thus realizing efficient point-to-multipoint in the network. Data transmission can save a lot of network bandwidth and reduce network load. [0003] Such as figure 1 Shown is a schematic diagram of the information transmission process in the multicast mode in the prior art. When some hosts in the IP network (that is, the receiver) need information, if the multicast method is used, the multicast source (that is, the Source) only needs to send a copy of the information, and the multicast distribution tree is established with the help of the multicast routing protocol. The transmit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/761H04L45/16
Inventor 柴佳林王琦
Owner NEW H3C TECH CO LTD
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