# Creating Trunks ## In this guide we will cover how to create a static trunk between switches and filter the VLANs across the link.

* We must create a static trunk on **Ethernet0/3** between **SW1** and **SW2**. ## Configuration * To create a trunk, we must go into the sub-configuration mode of **ETH 0/3** `SW1#conf t` # This command puts us in Global Config mode `SW1(config)#interface ethernet 0/3` # This command puts us into the interface sub-configuration mode `SW1(config-if)#switchport trunk encapsulation dot1q` # This command will set the trunk to use the IEEE **802.1q** Encapsulation standard `SW1(config-if)#switchport mode trunk` # This command will statically set the interface to **trunking** mode. * The complete configuration for both switches is shown below

### Filtering VLANs on trunk ports * To filter the VLANs and add or remove the VLANs allowed across a trunk, we use the commands below. `SW1(config-if)#switchport trunk allowed vlan 1,10,20,30` # This command will only VLANs 1,10,20,30 across the trunk `SW1(config-if)#switchport trunk allows [add | remove] vlan 40` # This command allows you to add or remove VLANs from the trunk port. * The complete configuration is shown below

Filtering the VLANs allowed across a trunk

## Verification * The following commands will show and verify the trunks, how they formed and what VLANs are allowed across the trunks. `SW1#show interface trunk` # This command will show us the active trunks on our switch.