how to setup a trunk port on cisco switch

A trunk port can have two or more VLANs configured on the interface;
it can carry traffic for several VLANs simultaneously while the access port can only carry traffic for one VLAN.

To configure a Trunk Port for port that connects to another switch, use the instructions below:


switch# configure terminal
switch(config)# interface gigabitEthernet 1/0/48
switch(config-if)# switchport mode trunk

Setup a either ISL or IEEE 802.1Q VLAN protocol on your trunk port.
ISL is a Cisco-proprietary trunking protocol, making it unsuitable for a multi-vendor environment, which makes IEEE 802.1Q the common VTP protocol.

Setup 802dot1Q on your trunking ports:


switch# configure terminal
switch(config)# interface gigabitEthernet 1/0/48
switch(config-if)# switchport trunk encapsulation dot1q

Allow all VLANs to pass trhough your trank ports:


switch# configure terminal
switch(config)# interface gigabitEthernet 1/0/48
switch(config-if)# switchport trunk allow vlan all

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