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Bridging method for supporting second-layer multicast forwarding and router thereof

A layer 2 multicast and forwarding method technology, applied in the field of network communication, can solve the problems that the wide area interface cannot support bridge multicast forwarding, and the member ports cannot learn congruent, so as to reduce the burden of replication and forwarding, reduce the burden of CPU, and save bandwidth. Effect

Active Publication Date: 2010-11-24
MAIPU COMM TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this may also cause the router to mistakenly believe that there is no IGMP member host on the corresponding port, and special processing needs to be done for the IGMP report, otherwise there will be a problem that the member port cannot learn all; Fourth, this solution only supports bridged multicast on the Ethernet interface Forwarding, bridged multicast forwarding cannot be supported on WAN interfaces

Method used

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  • Bridging method for supporting second-layer multicast forwarding and router thereof
  • Bridging method for supporting second-layer multicast forwarding and router thereof
  • Bridging method for supporting second-layer multicast forwarding and router thereof

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Embodiment Construction

[0029] Such as figure 1 As shown, the IGMP SNOOPING module and the BRIDGE (bridge) module work together. The BRIDGE module serves as the data plane, and the IGMP SNOOPING module serves as the control plane. The BRIDGE module and the IGMP SNOOPING module can transmit protocol messages and control function calls or notification information, which are indicated by the bidirectional arrows between BRIDGE and IGMPSNOOPING in the figure. A bridge module contains one or more bridge groups. Each bridge group contains some router interfaces (bridge group interfaces). The IGMP SNOOPING module runs one or more IGMP SNOOPING instances. Each instance contains some IGMP SNOOPING interfaces. These IGMP SNOOPING interface lists are obtained by assigning the interfaces of all bridge groups in the order 0, 1, 2, N-1.

[0030] Such as figure 2 As shown, in a certain instance i of the IGMP SNOOPING module, a subset of the IGMP SNOOPING interface list is included, IGMP SNOOPING interface 0,...

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Abstract

The invention provides an easy-realization bridging method for supporting second-layer multicast forwarding and a router for realizing the method. In the method, IGMP SNOOPING is run on a bridging module, and the IGMP SNOOPING is enabled on a certain designated bridging group through configuration, so the IGMP SNOOPING can acquire the bridging group ID of the bridging group, and an IGMP SNOOPING example is created aiming at the bridging group. When the IGMP SNOOPING is enabled on the bridging groups, the IGMP SNOOPING acquires interfaces of all bridging groups in an ergodic mode and establishes corresponding IGMP SNOOPING interfaces through the interfaces provided by the bridging groups; after the IGMP SNOOPING receives an IGMP message, the IGMP SNOOPING interfaces corresponding to the example ID in a second-layer multicast forwarding table maintained by the IGMP SNOOPING can also find the respectively corresponding bridging group interfaces; and after the second-layer multicast forwarding table is released to the bridging module, the bridging module can generate BMC table entries corresponding to the second-layer multicast forwarding table.

Description

technical field [0001] The invention relates to network communication technology, in particular to bridging technology and Layer 2 multicasting technology. Background technique [0002] On the router, the bridging technology transparently connects the bridging group interfaces in the bridging group. For unicast frames, bridging follows the 802.1D specification and uses flooding and source address learning to complete frame forwarding. For multicast frames, the bridging module copies and forwards on each bridging group interface of the bridging group, thereby transparently bridging the multicast services on each bridging group interface. However, this method of flooding the multicast frame will increase the CPU load of the router, cause bandwidth waste on each bridge group interface that does not need the multicast service frame, and increase the forwarding burden of other network devices. [0003] In the US patent document "FORWARDING MULTICAST FRAMES ON AN ETHERNETBRIDGE"...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H04L12/56H04L12/46H04L12/18H04L45/16H04L45/74
Inventor 王强林茂
Owner MAIPU COMM TECH CO LTD
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