Abstract: A method, device and system for forwarding a multicast data packet are provided. The system is an extended bridge constructed by a controlling bridge and a port extender. The controlling bridge transmits a multicast data packet with an ETAG having a multicast ECID via a cascade port, and the multicast ECID directs to egress ports in different VLANs of the multicast group on a port extender connected with the cascade port. The port extender receives the packet with the ETAG via an upstream port connected with the controlling bridge, searches for multicast duplication information matching the multicast ECID, duplicates the packet for each egress port based on the multicast duplication information, removes the ETAG of each copy of the packet, adds a port identification and a VLAN identification of each egress port to each copy of the packet, and transmits the packet containing the VLAN identification via each egress port.

Abstract: In an extended bridge comprising a controlling bridge and a port extender, the controlling bridge associates an aggregation port of a link aggregation group with a plurality of extended ports connecting to a same terminal on the port extender, and assigns an aggregation port identifier to the aggregation port. The controlling bridge associates an extended port identifier of each of the plurality extended ports and a cascaded port connecting to the port extender with the aggregation port. The controlling bridge associates the aggregation port with the aggregation port identifier and the cascaded port to determine to add the aggregation port identifier into a downstream unicast packet of which an egress port exiting the extended bridge is the aggregation port and to via determine to send the downstream unicast packet with the aggregation port identifier via the cascaded port.

Abstract: A method, device and system for forwarding a multicast data packet are provided. The system is an extended bridge constructed by a controlling bridge and a port extender. The controlling bridge transmits a multicast data packet with an ETAG having a multicast ECID via a cascade port, and the multicast ECID directs to egress ports in different VLANs of the multicast group on a port extender connected with the cascade port. The port extender receives the packet with the ETAG via an upstream port connected with the controlling bridge, searches for multicast duplication information matching the multicast ECID, duplicates the packet for each egress port based on the multicast duplication information, removes the ETAG of each copy of the packet, adds a port identification and a VLAN identification of each egress port to each copy of the packet, and transmits the packet containing the VLAN identification via each egress port.

Abstract: In an extended bridge comprising a controlling bridge and a port extender, the controlling bridge associates an aggregation port of a link aggregation group with a plurality of extended ports connecting to a same terminal on the port extender, and assigns an aggregation port identifier to the aggregation port. The controlling bridge associates an extended port identifier of each of the plurality extended ports and a cascaded port connecting to the port extender with the aggregation port. The controlling bridge associates the aggregation port with the aggregation port identifier and the cascaded port to determine to add the aggregation port identifier into a downstream unicast packet of which an egress port exiting the extended bridge is the aggregation port and to determine to send the downstream unicast packet with the aggregation port identifier via the cascaded port.

Abstract: Based on an example, a core backbone (CB) device receives via a second-level stacking port connected with a source port extender (PE) device, a packet containing a source port number and a local identifier of a source forwarding chip. The CB device transmits the packet via a second-level stacking port connected with a destination PE device, wherein the packet contains the source port number, a global identifier of the source forwarding chip, a local identifier of a destination forwarding chip and a destination port number.

Abstract: According to an example, after a primary port of a primary switch and a secondary port of a secondary switch are connected to each other and the primary port is configured to operate in a fabric mode, the primary switch may send a mode switch request packet to the secondary switch through the primary port. The secondary switch may change the secondary port from operating in an Ethernet mode to the fabric mode based on information contained in the mode switch request packet and may send a mode switch response packet to the primary switch.

Abstract: Based on an example, a core backbone (CB) device receives via a second-level stacking port connected with a source port extender (PE) device, a packet containing a source port number and a local identifier of a source forwarding chip. The CB device transmits the packet via a second-level stacking port connected with a destination PE device, wherein the packet contains the source port number, a global identifier of the source forwarding chip, a local identifier of a destination forwarding chip and a destination port number.

Abstract: According to an example, after a primary port of a primary switch and a secondary port of a secondary switch are connected to each other and the primary port is configured to operate in a fabric mode, the primary switch may send a mode switch request packet to the secondary switch through the primary port. The secondary switch may change the secondary port from operating in an Ethernet mode to the fabric mode based on information contained in the mode switch request packet and may send a mode switch response packet to the primary switch.