How to configure VLAN Trunking?

The below configuration should be done on one side of the trunk link, that is on a trunk port of one switch.

SW1# configure terminal
SW1# interface gigabit 0/1
SW1# switchport mode dynamic desirable
SW1# ^z

In the above configuration, SW1 is the switch name. ‘#’ denotes privileged EXEC mode or enable mode.

1. "configure terminal" command: This command is used to enter into Global configuration mode.
2. "interface gigabit0/1" command: To enter into interface configuration mode to configure the switch interface G0/1 as trunk port which is connected to the second switch for trunking.
3. "switchport mode dynamic desirable" command: To make this interface G0/1 to initiate negotiation messages and respond to negotaiation messages to dynamically choose to start trunking.
4. "^z" command: same as "end" command. 

Switchport mode  command's Administrative mode options

Operational mode is the expected mode after configuring administrative mode of trunked switch-ports.

Expected Trunking operational mode based on the configured Administrative modes

Administrative mode	Access	Dynamic Auto	Trunk	Dynamic Desirable
Access	Access	Access	Do not use	Access
Dynamic auto	Access	Access	Trunk	Trunk
Trunk	Do not use	Trunk	Trunk	Trunk
Dynamic desirable	Access	Trunk	Trunk	Trunk

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