Configuring a native VLAN on a trunk port

Do the following to set native VLAN characteristics on a trunk port for classifying the untagged traffic data packets.

Ensure that reserved VLANs are not used.

Enter the configure terminal command to access global configuration mode.
```
device# configure terminal
device(config)# 
```
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 native-vlan command to set native VLAN characteristics to access and specify a VLAN.
```
device(conf-if-eth-0/1)# switchport trunk native-vlan 300
```

Example

This example removes the configured native VLAN on the Ethernet interface.

device# configure terminal
device(config)# interface ethernet 0/1
device(conf-if-eth-0/1)# no switchport trunk native-vlan 300