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|1. (WO2018099393) METHOD OF FORWARDING MULTICAST DATA PACKET|
|Applicants:||NEW H3C TECHNOLOGIES CO., LTD.
|Title:||METHOD OF FORWARDING MULTICAST DATA PACKET|
The disclosure provides a method, device, and system for forwarding multicast data packet. The system comprises an extended bridge comprising a controlling bridge and port extender. The controlling bridge transmits via a cascade port a multicast data packet including an ETAG of a multicast ECID. The ETAG of the ECID points to an output port at the port extender connected to the cascade port and belonging to a different VLAN in a same multicast group. The port extender receives, via an uplink port connected to the controlling bridge, the multicast data packet including the ETAG, looks up, duplicated multicast information matching the multicast ECID, and duplicates, according to the duplicated multicast data, and for all output ports, the multicast data packet. The port extender further removes the ETAG from the multicast data packets, adds, to the multicast data packets, a port identifier and a VLAN identifier of each of the output ports, and transmits, via each of the output ports, the multicast data packets including the respective VLAN identifiers.