Operation Manual – Link AggregationH3C S5600 Series Ethernet Switches Chapter 1 Link Aggregation Configuration1-5z In a dynamic aggregation group, the selected port with the smallest port numberserves as the master port of the group, and other selected ports serve as memberports of the group.There is a limit on the number of selected ports in an aggregation group. Therefore, ifthe number of the member ports that can be set as selected ports in an aggregationgroup exceeds the maximum number supported by the device, the system willnegotiate with its peer end, to determine the states of the member ports according tothe port IDs of the preferred device (that is, the device with smaller system ID). Thefollowing is the negotiation procedure:1) Compare device IDs (system priority + system MAC address) between the twoparties. First compare the two system priorities, then the two system MACaddresses if the system priorities are equal. The device with smaller device ID willbe considered as the preferred one.2) Compare port IDs (port priority + port number) on the preferred device. Thecomparison between two port IDs is as follows: First compare the two portpriorities, then the two port numbers if the two port priorities are equal; the portwith the smallest port ID is the selected port and the left ports are unselected ports.Note:For an aggregation group:z When the rate or duplex mode of a port in the aggregation group changes, packetloss may occur on this port;z When the rate of a port decreases, if the port belongs to a manual or static LACPaggregation group, the port will be switched to the unselected state; if the portbelongs to a dynamic LACP aggregation group, deaggregation will occur on theport.1.3 Aggregation Group CategoriesDepending on whether or not load sharing is implemented, aggregation groups can beload-sharing or non-load-sharing aggregation groups. When load sharing isimplemented,z For IP packets, the system will implement load-sharing based on source IPaddress and destination IP address;z For non-IP packets, the system will implement load-sharing based on source MACaddress and destination MAC address.
