22Link aggregation modesAn aggregation group operates in one of the following modes:• Static—Static aggregation is stable. An aggregation group in static mode is called a staticaggregation group. The aggregation states of the member ports in a static aggregation groupare not affected by the peer ports.• Dynamic—An aggregation group in dynamic mode is called a dynamic aggregation group. Thelocal system and the peer system automatically maintain the aggregation states of the memberports, which reduces the administrators' workload.Aggregating links in static modeChoosing a reference portWhen setting the aggregation states of the ports in an aggregation group, the system automaticallychooses a member port as the reference port. A Selected port must have the same operational keyand attribute configurations as the reference port.The system chooses a reference port from the member ports that are in up state and have the sameattribute configurations as the aggregate interface.The candidate ports are sorted in the following order:1. Highest port priority2. Full duplex/high speed3. Full duplex/low speed4. Half duplex/high speed5. Half duplex/low speedThe candidate port at the top is chosen as the reference port.• If multiple ports have the same port priority, duplex mode, and speed, the port that has been aSelected port (if any) is chosen. If multiple ports have been Selected ports, the one with thesmallest port number is chosen.• If multiple ports have the same port priority, duplex mode, and speed and none of them hasbeen a Selected port, the port with the smallest port number is chosen.Setting the aggregation state of each member portAfter the reference port is chosen, the system sets the aggregation state of each member port in thestatic aggregation group.
