Cisco Systems N3KC3064TFAL3 Configuring the Native VLAN for 802.1Q Trunking Ports, Procedure

Configuring Access and Trunk Interfaces

Configuring the Native VLAN for 802.1Q Trunking Ports

	Command or Action	Purpose
Step 3	switch(config-if)# switchport	Sets the interface as an Ethernet trunk port. A trunk port can
	mode {access trunk}	carry traffic in one or more VLANs on the same physical
		link (VLANs are based on the trunk-allowed VLANs list).
		By default, a trunk interface can carry traffic for all VLANs.
		To specify that only certain VLANs are allowed on the
		specified trunk, use the switchport trunk allowed vlan
		command.

This example shows how to set an interface as an Ethernet trunk port:

switch# configure terminal switch(config)# interface ethernet 1/3 switch(config-if)# switchport mode trunk

Configuring the Native VLAN for 802.1Q Trunking Ports

If you do not configure this parameter, the trunk port uses the default VLAN as the native VLAN ID.

Procedure

	Command or Action	Purpose
Step 1	switch# configure terminal	Enters configuration mode.
Step 2	switch(config)# interface {type slot/port	Specifies an interface to configure, and enters
	port-channel number}	interface configuration mode.
Step 3	switch(config-if)# switchport trunk	Sets the native VLAN for the 802.1Q trunk. Valid
	native vlan vlan-id	values are from 1 to 4094, except those VLANs
		reserved for internal use. The default value is
		VLAN1.

This example shows how to set the native VLAN for an Ethernet trunk port:

switch# configure terminal switch(config)# interface ethernet 1/3 switch(config-if)# switchport trunk native vlan 5

Configuring the Allowed VLANs for Trunking Ports

You can specify the IDs for the VLANs that are allowed on the specific trunk port.

Before you configure the allowed VLANs for the specified trunk ports, ensure that you are configuring the correct interfaces and that the interfaces are trunks.

Cisco Nexus 3000 NX-OS Layer 2 Switching Configuration Guide, Release 5.0(3)U3(1)

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