3Com 2928 - Baseline Plus Switch PWR, User Manual

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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.
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Port attribute configuration includes the configuration of the port rate, duplex mode, and link state.
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For details about class-two configurations, see section Class-two configurations .
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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.
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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.