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Method realizing IGMP interception function on modem device with 4 ethernet interfaces

A modem and Ethernet technology, which is applied in data exchange network, branch offices to provide special service devices, data exchange details, etc. It can solve the problems that the forwarding table cannot be directly modified, the exchange chip is expensive, and the flexibility of the Modem equipment exchange chip is limited. , to achieve stable and reliable working performance, reduce dependence, and a wide range of applications

Inactive Publication Date: 2008-11-26
SHANGHAI DAREGLOBAL TECHNOLOGIES CO LTD
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0006] However, the switch chip that provides the IGMP Snooping function is expensive, and many low-end switch chips cannot support it, which limits the flexibility of Modem equipment manufacturers to choose switch chips
Moreover, the IGMP Snooping function supported by the switch chip generally cannot directly modify the forwarding table
For some applications, it is difficult to meet the requirements of forwarding IPTV program multicast packets to fixed ports

Method used

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  • Method realizing IGMP interception function on modem device with 4 ethernet interfaces
  • Method realizing IGMP interception function on modem device with 4 ethernet interfaces
  • Method realizing IGMP interception function on modem device with 4 ethernet interfaces

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Embodiment Construction

[0056] In order to be able to understand the technical content of the present invention more clearly, the following embodiments are specifically described in detail.

[0057] See figure 2 As shown, the method for implementing the IGMP snooping function on the four Ethernet port modem device includes the switching module and the network driving module in the modem device. The main feature is that the method includes the following steps:

[0058] (1) The system performs initialization operations;

[0059] (2) The system sets the control register in the switch module so that the switch module adds redundant information containing the message receiving port to the forwarded Ethernet message, and the redundant information may also include the Ethernet message The "EgressTrailer" additional information added later or the "Special Tag" additional information added in the middle of the Ethernet packet;

[0060] (3) The system intercepts the Ethernet message, and analyzes to determine whe...

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Abstract

The invention relates to a method for realizing IGMP snooping on a quadri-Ethernet port modem device. The method comprises configuring a control register in a switching module to add redundant information to a retransmitted Ethernet message, wherein the redundant information comprises a receiving port of the message, intercepting and analyzing whether the Ethernet message is an IGMP message or not, if the Ethernet message is the IGMP message, sending the IGMP message by a system to a network drive module which judges the type of the IGMP message, then adding retransmitted information to an IGMP Report message, and deleting retransmitted information to an IGMP Leave message. The IGMP snooping method realized on a quadri-Ethernet port modem device guarantees multicast messages to be retransmitted to an accurate port, thereby effectively avoiding the waste of the bandwidth of exchange chips, reducing the dependency of choosing the exchange chips, increasing the flexibility of selection on the exchange chips for Modem devices factories, and largely reducing the manufacturing cost, simultaneously the working property is stable and reliable, and the application range is relatively wide.

Description

Technical field [0001] The invention relates to the field of computer networks, in particular to the technical field of multicast in network communications, and specifically refers to a method for implementing IGMP Snooping through software on a four-Ethernet port modem device (ie, xDSL MODEM). Background technique [0002] At present, the application of TV services (Internet TV or IPTV) carried on IP networks is becoming more and more popular. The IPTV system consists of a program server, telecommunications central office equipment (digital subscriber line access multiplexer, DSLAM), four Ethernet port modem (xDSLModem), and receiving terminal set-top box equipment (STB). [0003] IPTV terminal-set-top box (STB) when the user switches programs, it will send IGMP messages according to the Internet Group Management Protocol (IGMPv2) to control joining or leaving a program, and each program corresponds to a unique multicast group address. The program data stream is sent by the IPTV...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/18H04L12/26H04L12/56H04L12/28H04L12/939
Inventor 严向阳
Owner SHANGHAI DAREGLOBAL TECHNOLOGIES CO LTD
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