IMC Networks Giga-AcessEtherLinx-II - Manual (Page 23)

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Mode 7 allows the user to define whether a port is a Trunk (passes everything,
including management), or a Drop (can add/remove VLAN tags). Unit management
is also enabled through any Trunk port.
Once a port is defined as a Drop Port, additional screens are provided to assign
VLAN values based on the classification of the incoming frame.