Configure Q in Q atau

Q-in-Q encapsulation digunakan untuk routing VLAN antar PE atau sering disebut Vlan dan Vlan. berikut adalah contoh konfigurasinya :

 user1 —– sw-a — PE-sw1==== PE-sw2 —sw-b –user2

SW-a
########################
interface FastEthernet0/1
description Connection to user1
switchport access vlan 20
switchport mode access
!
interface FastEthernet0/24
description Trunk
switchport trunk allowed vlan 20
switchport mode trunk

PE-SW1
#########################
interface FastEthernet2/0/1
description Connection to sw-a
switchport access vlan 100
switchport mode dot1q-tunnel
no cdp enable
!
interface FastEthernet2/0/24
description Connection to PE-sw2
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 100
switchport mode trunk

PE-SW2
###########################
interface FastEthernet2/0/1
description Connection to sw-b
switchport access vlan 100
switchport mode dot1q-tunnel
no cdp enable
!
interface FastEthernet2/0/24
description Connection to PE-sw1
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 100
switchport mode trunk

SW-b
##########################
interface FastEthernet0/1
description Connection to user1
switchport access vlan 20
switchport mode access
!
interface FastEthernet0/24
description Trunk
switchport trunk allowed vlan 20
switchport mode trunk

Yang paling penting untuk q-in-q adalah konfigurasi PE Switch yg menuju switch user, yaitu : switchport trunk encapsulation dot1q