Configure QinQ (802.1ad) in a Cisco IOS-XE Router

Here's a Cisco link in configuring QinQ (802.1ad) or double VLAN tagging in a Cisco IOS-XE router.

SUMMARY STEPS

1.  enable
2. configure terminal
3. interface type number
4. dot1q tunneling ethertype ethertype
5. interface type number . subinterface-number
6. encapsulation dot1q vlan-id second-dot1q {any | vlan-id | vlan-id - vlan-id [ vlan-id - vlan-id ]}
7. pppoe enable [group group-name ] [max-sessions max-sessions-number ]
8. exit
9. Repeat Step 5 to configure another subinterface.
10. Repeat Step 6 and Step 7 to specify the VLAN tags to be terminated on the subinterface.
11. end 

 

Router(config)#interface GigabitEthernet0/0/1

Router(config-if)#dot1q ?

  tunneling  dot1q tunneling configuration

 

Router(config-if)#dot1q tunneling ?

  ethertype  ethertype used for dot1q tunneling packets

 

Router(config-if)#dot1q tunneling ethertype ?

  0x88A8  dot1q tunneling etype 0x88A8

  0x9100  dot1q tunneling etype 0x9100

  0x9200  dot1q tunneling etype 0x9200

 

Router(config-if)#dot1q tunneling ethertype 0x88A8

Router(config-if)#end

 

Router#show run interface Gi0/0/1   

Building configuration...

 

Current configuration : 173 bytes

!

interface GigabitEthernet0/0/1

 no ip address

 negotiation auto

 dot1q tunneling ethertype 0x88A8

end

 

 

Router#configure terminal
Enter configuration commands, one per line.  End with CNTL/Z.
Router(config)#interface GigabitEthernet0/0/1.210
Router(config-subif)#encapsulation ?
  dot1Q            IEEE 802.1Q Virtual LAN
  priority-tagged  Priority-tagged (VLAN 0)

Router(config-subif)#encapsulation dot1q ?
  <1-4094>  IEEE 802.1Q VLAN ID required

Router(config-subif)#encapsulation dot1q 20 ?
  native        Make this as native vlan
  second-dot1q  Configure this subinterface as a 1Q-in-1Q subinterface
  <cr>          <cr>

Router(config-subif)#encapsulation dot1q 20 second-dot1q ?
  WORD  Second (inner) VLAN IDs e.g. 100,200-300,400,500-600
  any   All Inner VLAN IDs not configured on another subinterface

Router(config-subif)#encapsulation dot1q 20 second-dot1q 200
Router(config-subif)#end

 

Router#show run interface Gi0/0/1.200   

Building configuration...

 

Current configuration : 216 bytes

!

interface GigabitEthernet0/0/1.200

 encapsulation dot1Q 20 second-dot1q 200

 ip vrf forwarding CUSTOMER-A

 ip address 192.168.200.1 255.255.255.0

end