How To Configure Trunking On Cisco Switch?
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1. Log into the Cisco switch using a console or SSH connection.
2. Enter the global configuration mode using the command “configure terminal“.
3. Create a trunk port by entering the interface command followed by the desired interface.
interface <port–name>
4. Set the port to trunk mode by entering the following command: switchport mode trunk
5. Determine and set the trunking encapsulation type by entering the following command: switchport trunk encapsulation {dot1q | isl}
6. Specify the VLANs that should be allowed on the trunk port by entering the following commands: switchport trunk allowed vlan {add | all | except | remove} <vlan list>
7. Enable 802.1Q trunking on the port by entering the following command: switchport nonegotiate
8. Verify the configuration by entering the show interfaces <port–name> switchport command.
9. Save the configuration by entering the copy running–config startup–config command.