Method, device and system for implementing multicast forwarding in extended VLAN bridge

  • US 9,049,138 B2
  • Filed: 03/18/2011
  • Issued: 06/02/2015
  • Est. Priority Date: 06/08/2010
  • Status: Active Grant
First Claim
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1. A method for implementing multicast forwarding in an Extended VLAN Bridge (EVB), comprising:

  • receiving a multicast frame and acquiring a multicast address from the multicast frame;

    inquiring two or more subgroups corresponding to the multicast address from a first preset mapping table;

    inquiring an identifier (ID) corresponding to each subgroup, mapping port corresponding to each ID of the corresponding subgroup and a master port of the inquired mapping ports from the first preset mapping table;

    forwarding, when the ID of the corresponding subgroup is a Multicast Identifier (MCID), the multicast frame carrying the MCID to a corresponding Port Extender (PE) assembly via the master port; and

    distributing, by the PE assembly, the multicast frame to a User Equipment (UE) according to a correspondence between the MCID carried in the multicast frame and a downlink port of the PE assembly,wherein distributing, by the PE assembly, the multicast frame to a UE according to a correspondence between the MCID carried in the multicast frame and a downlink port of the PE assembly comprises;

    receiving, by the PE assembly, the multicast frame carrying the MCID via an uplink port;

    inquiring on a second preset mapping table, duplicating and forwarding the multicast frame through a downlink port which extended level by level according to a correspondence between the MCID carried in the multicast frame and a PE downlink port in the second preset mapping table;

    stripping the MCID from the multicast frame when the multicast frame is forwarded to an external port between the PE assembly and the UE; and

    sending the multicast frame stripped of the MCID to the UE via the external port.

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