Usando una singola interfaccia fisica del router è possibile fare da gateway predefinito per più sottoreti.
Configurazione Router (Router-on-a-Stick)
R1> enable
R1# configure terminal
R1(config)# interface GigabitEthernet 0/0
R1(config-if)# no shutdown
R1(config-if)# exit
! Creare una sotto-interfaccia per VLAN 10
R1(config)# interface GigabitEthernet0/0.10
R1(config-subif)# encapsulation dot1Q 10
R1(config-subif)# ip address 10.0.10.1 255.255.255.0
! Creare una sotto-interfaccia per VLAN 20
R1(config)# interface GigabitEthernet0/0.20
R1(config-subif)# encapsulation dot1Q 20
R1(config-subif)# ip address 10.0.20.1 255.255.255.0
R1(config)# end
R1# copy running-config startup-configConfigurazione Switch
SW1> enable
SW1# conf t
! Creazione VLAN
SW1(config)# vlan 10
SW1(config-vlan)# name aula10
SW1(config-vlan)# exit
SW1(config)# vlan 20
SW1(config-vlan)# name aula20
SW1(config-vlan)# exit
! Porte in access
SW1(config)# interface FastEthernet0/1
SW1(config-if)# switchport mode access
SW1(config-if)# switchport access vlan 10
SW1(config-if)# exit
SW1(config)# interface FastEthernet0/2
SW1(config-if)# switchport mode access
SW1(config-if)# switchport access vlan 20
SW1(config-if)# exit
! Porta verso il router in trunk (es: Gi0/1)
SW1(config)# interface GigabitEthernet0/1
SW1(config-if)# switchport mode trunk
SW1(config-if)# exit
SW1(config)# end
SW1# copy running-config startup-configConfigurazione PC
PC1 (VLAN 10)
- IP: 10.0.10.10
- Subnet mask: 255.255.255.0
- Gateway: 10.0.10.1
PC2 (VLAN 20)
- IP: 10.0.20.10
- Subnet mask: 255.255.255.0
- Gateway: 10.0.20.1
