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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Configuring Native VLANs

Traditionally, ports can be either untagged for membership to one VLAN or tagged for membership to multiple VLANs.

You must connect an untagged port to a VLAN-unaware station (one that does not understand VLAN tags), and you must connect a tagged port to a VLAN-aware station (one that generates and understands VLAN tags).

Native VLAN support breaks this barrier so that you can connect a port to both VLAN-aware and VLAN-unaware stations. Such ports are referred to as hybrid ports. Physical and port-channel interfaces may be hybrid ports.

Native VLAN is useful in deployments where a Layer 2 port can receive both tagged and untagged traffic on the same physical port. The classic example is connecting a voice-over-IP (VOIP) phone and a PC to the same port of the switch. The VOIP phone is configured to generate tagged packets (with VLAN = VOICE VLAN) and the attached PC generates untagged packets.

  • NOTE: You cannot configure an existing switchport or port channel interface for Native VLAN. Interfaces must have no other Layer 2 or Layer 3 configurations when using the portmode hybrid command or a message similar to this displays: % Error: Port is in Layer-2 mode Gi 5/6.

To configure a port so that it can be a member of an untagged and tagged VLANs, use the following commands.

  1. Remove any Layer 2 or Layer 3 configurations from the interface. INTERFACE mode
  2. Configure the interface for Hybrid mode. INTERFACE mode portmode hybrid
  3. Configure the interface for Switchport mode. INTERFACE mode switchport
  4. Add the interface to a tagged or untagged VLAN. VLAN INTERFACE mode [tagged | untagged]

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