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Method for resolving abnormal multi-cast business resulted from IGMP Leave message drop

A packet loss and multicast technology, applied in digital transmission systems, electrical components, transmission systems, etc., can solve the problems of wasting home network bandwidth, multicast stream packet loss, line bandwidth waste, etc., and achieve a good user experience effect

Inactive Publication Date: 2006-10-25
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method solves multicast abnormalities caused by the loss of IGMP Leave messages, such as multicast stream packet loss (unable to watch normally), unsuccessful channel switching, waste of line bandwidth, and impact on IPTV applications due to loss of IGMP Leave messages. Other services and wasting home network bandwidth and other issues, so as to provide a good user experience

Method used

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  • Method for resolving abnormal multi-cast business resulted from IGMP Leave message drop
  • Method for resolving abnormal multi-cast business resulted from IGMP Leave message drop
  • Method for resolving abnormal multi-cast business resulted from IGMP Leave message drop

Examples

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Embodiment Construction

[0018] Take the IGMP Leave message loss processing process in DSLAM as an example. DSLAM supports the multicast CAC function: this function can limit the total bandwidth of the multicast groups that a user port can join at the same time, or limit the number of multicast groups that a user port can join at the same time. Reference attachment image 3 The implementation process of this embodiment is as follows:

[0019] 1) The user is watching channel A (corresponding to multicast group A), and the DSLAM sends the traffic of multicast group A to the user;

[0020] 2) The user switches channels and wants to switch from channel A to channel B;

[0021] 3) The user terminal sends an IGMP Leave message to leave multicast group A, but the message is lost for some reason and the DSLAM does not receive it;

[0022] 4) The user terminal sends an IGMP Join message to join multicast group B;

[0023] 5) After receiving the IGMP Join message, the DSLAM finds that the bandwidth of multicast grou...

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Abstract

Characters of the method are as follows. When network equipment finds out that Leave message in Internet group management protocol (IGMP) is lost at user and / or user port, the method finds out multicast group not belonged to the user / user port through IGMP query. The method makes the user / user port become normal multicast user / user port again. Based on existed CAC processing mechanism and standard IGMP, the invention does not modify multicast protocol stack of network equipment. Redefining flow of processing multicast solves severe problem caused by losing IGMP Leave message. The invention solves issues of IPTV etc. application including loss of IGMP Leave message (unable to watch normally), not successful to switch channels, wasting bandwidth of line so as to influence on other services etc.

Description

Technical field [0001] The present invention relates to Internet Group Management Protocol (IGMP), in particular to a method for processing IGMPLeave message loss. Background technique [0002] The multicast network architecture includes: the basic working principle of multicast, the conditions for realizing multicast, the address allocation scheme of multicast and the mapping with the media access control layer (MAC) address, and the Internet Group Management Protocol (IGMP). [0003] The working principle of multicast is: multicast is a network technology that allows one or more senders (multicast sources) to send a single data packet to multiple receivers (once, at the same time). The multicast source sends data packets to a specific multicast group, and only addresses belonging to the multicast group can receive the data packets. Simply put, a host joins a multicast group by using the Internet Group Management Protocol and can leave the group dynamically, that is, the members...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L29/06
CPCH04L12/185H04L12/1868H04L12/1886
Inventor 李军魏家宏
Owner HUAWEI TECH CO LTD