Configurar puerta para Servidor
(interface) description Mail server (interface) speed 100 (interface) duplex full (interface) spanning-tree portfast (interface) switchport mode access (interface) no channel-group (interface) no shutdown
Ejemplo de TRUNK
Access_1 (config)#interface gigabitethernet 0/1 Access_1 (config-if)#switchport mode trunk Access_1 (config-if)#switchport trunk encapsulation dot1q Access_1 (config-if)#switchport trunk allowed vlan remove 2-1001 Access_1 (config-if)#switchport trunk allowed vlan add 5,8,10 Access_1 (config-if)#end
o bien
interface FastEthernet0/18
switchport trunk encapsulation dot1q switchport trunk native vlan 10 switchport trunk allowed vlan 10,20 switchport mode trunk