3Com 2928 User Guide - Page 250

z Reference port: Select a port as the reference port from the ports that are in up state and with the same class-two configurations as the corresponding aggregate interface. The selection order is as follows: full duplex/high speed, full duplex/low speed, half duplex/high speed, and half duplex/low speed, with full duplex/high speed being the most preferred. If two ports with the same duplex mode/speed pair are present, the one with the lower port number wins out. z Port attribute configuration includes the configuration of the port rate, duplex mode, and link state. z For details about class-two configurations, see section Class-two configurations. z To guarantee a successful static aggregation, ensure that the ports at the two ends of each link to be aggregated are consistent in the selected/unselected state; to guarantee a successful dynamic aggregation, ensure that the peer ports of the ports aggregated at one end are also aggregated. The two ends can automatically negotiate the selected state of the ports. z Removing a Layer 2 aggregate interface also removes the corresponding aggregation group. Meanwhile, the member ports of the aggregation group, if any, leave the aggregation group. 1-13