Enabling VLAN tagging for native traffic

Ensure that reserved VLANs are not used.

The following table describes the acceptable frame types, as well as system behavior, for tagged native VLAN, untagged native VLAN, and no native VLAN.

Table 1. Acceptable frame types and system behavior for native VLANs
	Tagged native VLAN	Untagged native VLAN	No native VLAN
Configuration	switchport trunk tag native-vlan (Default) and Globally: vlan dot1q tag native	no switchport trunk tag native-vlan or Global config: no vlan dot1q tag native	switchport mode trunk-no-default-native
Acceptable frame type	VLAN-tagged only	All (tagged and untagged)	VLAN-tagged only
Receive untagged	Drop	Forward/flood in native VLAN	Drop
Receive tagged on native VLAN	Forward/flood in native VLAN	Forward/flood in native VLAN	Drop
Transmit on native VLAN	Tagged with native VLAN	Untagged packet	Will not forward on native VLAN

Enter the configure terminal command to access global configuration mode.
```
device# configure terminal 
```
Enter the interface ethernet command to configure the interface mode.
```
device(config)# interface ethernet 0/1
```
Enter the switchport command to set the interface as switchport.
```
device(conf-if-eth-0/1)# switchport
```
Enter the switchport trunk tag native-vlan command to enable tagging for native traffic data VLAN characteristics on a specific interface.
```
device(conf-if-eth-0/1)# switchport trunk tag native-vlan 
```

This example enables tagging for native traffic data on a specific Ethernet interface.

device# configure terminal
device(config)# interface ethernet 0/1
device(conf-if-eth-0/1)# switchport trunk tag native-vlan

This example disables the native VLAN tagging on a port-channel.

device# configure terminal
device(config)# interface port-channel 35
device(config-Port-channel-35)# no switchport trunk tag native