The example shows how to configure interface FastEthernet 5/8 as an 802.1Q
trunk.
Frames from
VLANS 1, 5, 11 and 1002-1005 will be allowed to traverse the trunk link. The
switchport mode for the interface is trunk (on) and there are to be no DTP
messages sent on the interface.

Example: Configuring a Port for 802.1Q Trunking
This example
shows how to configure a port for 802.1Q trunking:
Switch#configure terminal
Enter configuration commands, one per line. End with
CNTL/Z.
Switch(config)#interface
fastethernet 5/8
Switch(config-if)#shutdown
Switch(config-if)#switchport
trunk encapsulation dot1q
Switch(config-if)#switchport
mode trunk
Switch(config-if)#switchport mode
nonegotiate
Switch(config-if)#switchport trunk native
vlan 99
Switch(config-if)#no
shutdown
Switch(config-if)#end
Switch#exit
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CAUTION:
Ensure that the native VLAN for an 802.1Q trunk is the same on both
ends of the trunk link. If there is native VLAN mismatch, traffic cannot be
transmitted correctly on the trunk.
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Verify the 802.1Q Configuration
Example: Configure
and Display Port Information for 802.1Q Dynamic Trunk Link
This example
shows how to display port information for 802.1Q trunking:

Example: Displaying Trunk Information for 802.1Q Trunking
This
example shows how to display trunk information for 802.1Q trunk links. Notice
that the encapsulation type is n-802.1q, showing that DTP negotiated the
trunking protocol with the other switch.
