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Method for precisely forwarding IP multicast data in VLAN and forward device

A technology of IP multicast and forwarding equipment, which is applied in the field of multicast technology, and can solve the problems of unsupported and unable to realize multicast source IP identification and forwarding, etc.

Active Publication Date: 2010-07-07
MAIPU COMM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The implementation of this technology needs to be modified for the hardware switch chip (L2MC switch chip), but the switch chip currently purchased does not support this function
In addition, this technology cannot realize the identification and forwarding of the multicast source IP

Method used

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  • Method for precisely forwarding IP multicast data in VLAN and forward device
  • Method for precisely forwarding IP multicast data in VLAN and forward device
  • Method for precisely forwarding IP multicast data in VLAN and forward device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Such as figure 2 , there are two legal multicast sources 192.168.36.31 and 192.168.36.32 and one illegal multicast source 192.168.37.11, both of which send multicast data to the multicast group 224.1.1.12. The multicast data of the three multicast sources all enter the switch from the uplink port of the switch. Ports A, B, and C of the switch are connected to hosts A, B, and C respectively, and ports A, B, and C and the uplink port belong to and only belong to the same VLAN100.

[0056] If a host joins a multicast group with an IGMPv2 report message, it cannot distinguish the multicast source when forwarding, and the data of the three multicast groups will be forwarded to the receiver. Using IGMPv3 report messages to specify to join or prohibit certain multicast sources, and discarding multicast data without forwarding entries in the VLAN solves this problem very well.

[0057] When host A only wants to receive multicast data from 192.168.36.31, host A will send an I...

Embodiment 2

[0066] According to the forwarding method, a forwarding device for accurately forwarding IP multicast data in a VLAN is provided. Figure 5 It is a block diagram of accurately forwarding IP multicast data forwarding equipment in a VLAN according to the present invention, and the IP multicast forwarding equipment includes:

[0067] Group record module 51: used to generate a port group record according to the received IGMP report of the host member. According to the IGMPv3 protocol defined by RFC3376, there are six types of member reports, namely IS_IN, IS_EX, TO_IN, TO_EX, ALLOW, and BLOCK, and includes two types of timers: active timer and group timer. The port of the forwarding device of the present invention receives the above six types of report messages and the eight events that the two types of timers expire, all of which cause group record changes.

[0068] Group record processing module 52, for mapping to IP multicast forwarding table according to the change of group r...

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Abstract

The invention relates to multicast technology and provides a method for precisely forwarding IP multicast data according to a multicast group IP address and a multicast source IP address in a VLAN and a switching device. A forward table entry identifying multicast sources is established so that the user really shields the multicasts that the user does not want to receive; a multicast forward table comprising the multicast sources is formed in a forward device; a hardware IP multicast forward table is generated according to the multicast forward table; the two-layer hardware IP multicast forward table does not need to be modified based on the multicast forward table and also does not need to be modified aiming at the switching chip of the hardware.

Description

technical field [0001] The present invention relates to multicast technology. Background technique [0002] IGMP (Internet Group Management Protocol, Internet Group Management Protocol) is a protocol responsible for IP multicast member management in the TCP / IP protocol suite, which is used to establish and maintain multicast between an IP host and its directly adjacent multicast forwarding equipment. Group membership. For the switch, when it receives the multicast data sent from the multicast forwarding device, if there is no multicast membership table, it will forward it to all the hosts in its VLAN (virtual local area network), and directly flood it in the VLAN. In order to effectively suppress the spread of multicast data in the link layer, the IGMP Snooping (Internet Group Membership Management Protocol snooping) layer 2 multicast protocol is introduced. IGMP snooping establishes the correspondence between multicast groups and ports by monitoring the IGMP reports sent ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L12/18H04L12/46H04L45/74
Inventor 王强吴迪支建
Owner MAIPU COMM TECH CO LTD