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Segue a configuração do modo trunk na porta do switch que o router está conectado.


            switch(config)#inter f0/0

            switch(config-if)#switchport mode trunk

            switch(config-if)#switchport trunk allowed vlan 10

            switch(config-if)#switchport trunk allowed vlan add 20

Vamos configurar as sub-interfaces e endereçamento IP no Router para que ele consiga rotear os pacotes entre as VLAN’s.


            Interface fastethernet0/0

            no shutdown

            exit

            interface fastethernet0/0.1

            encapsulation dot1q 1 native

            ip address 192.168.1.1 255.255.255.0

            interface fastethernet0/0.10

            encapsulation dot1q 10

            ip address 192.168.5.1 255.255.255.0

            interface fastethernet0/0.20

            encapsulation dot1q 20

            ip address 192.168.6.1 255.255.255.0

            r_vlan#