vlan dot1Q tag native

To enable dot1q (IEEE 802.1Q) tagging for all native VLANs on all trunked ports on the switch, use the vlan dot1Q tag native command. To disable dot1q (IEEE 802.1Q) tagging for all native VLANs on all trunked ports on the switch, use the no form of this command.

vlan dot1Q tag native

no vlan dot1Q tag native

Syntax Description

This command has no arguments or keywords.

Command Default

Disabled

Command Modes

Global configuration mode

Command History

Usage Guidelines

Typically, you configure 802.1Q trunks with a native VLAN ID, which strips tagging from all packets on that VLAN.

To maintain the tagging on the native VLAN and drop untagged traffic, use the vlan dot1q tag native command. The switch will tag the traffic received on the native VLAN and admit only 802.1Q-tagged frames, dropping any untagged traffic, including untagged traffic in the native VLAN.

Control traffic continues to be accepted as untagged on the native VLAN on a trunked port, even when the vlan dot1q tag native command is enabled.

Note The vlan dot1q tag native command is enabled on global basis

Examples

This example shows how to enable 802.1Q tagging on the switch:

switch(config)# vlan dot1q tag native 

switch(config)# 

This example shows how to disable 802.1Q tagging on the switch:

switch(config)# no vlan dot1q tag native 

Turning off vlan dot1q tag native may impact the functioning of existing dot1q tunnel ports

switch(config)# 

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