Lectures on LAN Switching – Part 09

Sample Configuration – Access and Trunking

Now, it’s time for us to give sample configurations for Access mode switchports and Trunk mode switchports.

Access Mode Switchport Configuration:

Switch#config terminal
Switch(config)#int fa0/1
Switch(config-if)# switchport
Switch(config-if)# switchport access vlan 10
Switch(config-if)# switchport mode access

*Note that this Access Mode Switchport Configuration is for Static VLAN configuration only. For Dynamic VLAN configuration, there should be an external VLAN Membership Policy Server (VMPS), and the configuration will be “switch port access vlan dynamic”

*The same configuration is used to assign a switchport to a VLAN. In this case, interface fa0/1 is assigned to VLAN 10


Trunk Mode Switchport Configuration:

Using Dot1q Tagging

Switch#config terminal
Switch(config)#int fa0/1
Switch(config-if)# switchport
Switch(config-if)# switchport trunk encapsulation dot1q
Switch(config-if)# switchport trunk native 10
Switch(config-if)# switchport mode trunk

Using ISL Encapsulation

Switch#config terminal
Switch(config)#int fa0/1
Switch(config-if)# switchport
Switch(config-if)# switchport trunk encapsulation isl
Switch(config-if)# switchport mode trunk

On Trunk Mode Configuration, there are two other configuration options available:

Switch(config-if)#switchport trunk allowed vlan

This is to set allowed VLAN characteristics when interface is in trunking mode

Switch(config-if)#switchport trunk pruning vlan

This is to set pruning VLAN characteristics when interface is in trunking mode.

Lastly, if a switchport will be connected to another switchport (another Switch), the configuration on both switchports should be similar.