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Multicast forwarding method and device

A multicast forwarding table and multicast technology, applied in the field of communication, can solve problems such as multicast traffic flooding, and achieve the effect of avoiding flooding and accurate forwarding.

Active Publication Date: 2016-04-27
HANGZHOU DPTECH TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of this, the present invention provides a method and device for forwarding multicast traffic to solve the problem of multicast traffic flooding in a VLAN

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specific Embodiment approach

[0059] In an optional embodiment of the present invention, an aging mechanism may be set for the Layer 2 multicast forwarding entry. Its specific implementation is as follows:

[0060] After the CPU sends the two-layer multicast forwarding table item to the forwarding chip, it can start a timer for the two-layer multicast forwarding table item, and whenever the timer reaches the timing period (such as 60 seconds), the CPU It can detect whether the Layer 2 multicast forwarding entry is used, that is, detect whether the multicast traffic processed on the forwarding chip has multicast traffic corresponding to the delivered Layer 2 multicast forwarding entry. When multicast traffic is detected, it means that the Layer 2 multicast forwarding entry is being used, so it needs to be kept, so the timer can be retimed until the next timing period is reached, and multicast traffic detection is performed again; When there is no multicast traffic, it means that the Layer 2 multicast forwa...

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Abstract

The invention provides a multicast flow forwarding method and device. The method is applied to a two-layer switching device located at a multicast source end, and the method comprises the following steps: receiving unknown multicast flow sent by a forwarding chip; obtaining an exit port corresponding to a multicast group media access control layer MAC address of the unknown multicast flow; and establishing a two-layer multicast forwarding entry according to a corresponding relation of the multicast group MAC address and the exit port; issuing the two-layer multicast forwarding entry to the forwarding chip, so that the forwarding chip carries out two-layer forwarding on the unknown multicast flow according to the two-layer multicast forwarding entry. Therefore, by adopting the multicast flow forwarding method and device provided by the invention, the two-layer switching device located at the multicast source end obtains the multicast group MAC address and the exit port corresponding to the multicast flow, and the two-layer multicast forwarding entry is established according to the corresponding relation of the multicast group MAC address and the exit port and is issued to the forwarding chip, so that the multicast flow can be accurately forwarded to avoid flooding of the multicast flow in VLAN.

Description

technical field [0001] The present invention relates to the technical field of communication, in particular to a multicast flow forwarding method and device. Background technique [0002] With the development of the Internet, the application of multicast technology in daily life is becoming more and more extensive. In the existing networking, the Layer 2 switching device at the multicast receiving end can generally learn the router port and member port of the Layer 2 switching device through IGMP-SNOOPING (Internet Group Management Protocol Snooping, Internet Group Management Snooping) technology, and according to the multicast traffic The mapping relationship between MAC (MediaAccessControl, media access control layer) address and member port creates a layer 2 multicast forwarding table item, and then sends the layer 2 multicast forwarding table item to the switch chip, so that the switch chip Forwarding entries forward multicast traffic. [0003] However, in practical ap...

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Application Information

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IPC IPC(8): H04L12/761H04L12/741H04L45/16H04L45/74
Inventor 刘晓贺
Owner HANGZHOU DPTECH TECH
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