Virtual LANs (VLAN) | 913Native VLANsTraditionally, ports can be either untagged for membership to one VLAN or tagged for membership tomultiple VLANs. An untagged port must be connected to a VLAN-unaware station (one that does notunderstand VLAN tags), and a tagged port must be connected to a VLAN-aware station (one that generatesand understands VLAN tags).Native VLAN support breaks this barrier so that a port can be connected to both VLAN-aware andVLAN-unaware stations. Such ports are referred to as hybrid ports. Physical and port-channel interfacesmay be hybrid ports.Native VLAN is useful in deployments where a Layer 2 port can receive both tagged and untagged trafficon the same physical port. The classic example is connecting a VOIP phone and a PC to the same port ofthe switch. The VOIP phone is configured to generate tagged packets (with VLAN = VOICE VLAN), andthe attached PC generates untagged packets.To configure a port so that it can be a member of an untagged and tagged VLANs:Step Task Command Command Mode1 Remove any Layer 2 or Layer 3 configurations from the interface. INTERFACE2 Configure the interface for hybrid mode. portmode hybrid INTERFACE3 Configure the interface for switchport mode. switchport INTERFACE4 Add the interface to a tagged or untagged VLAN. [tagged | untagged] VLAN INTERFACENote: An existing switchport or port channel interface cannot be configured for Native VLAN. Interfacesmust have no other Layer 2 or Layer 3 configurations when entering the command portmode hybrid or amessage like Message 1 is displayed.Message 1 Native VLAN Error% Error: Port is in Layer-2 mode Gi 5/6.
