Configuring a Dot1q Termination Sub-interface

Context

When a VPN connects to an ISP network through a sub-interface, the sub-interface needs to remove a single VLAN tag from the packets sent to the ISP network. This can be achieved by configuring the sub-interface as a Dot1q termination sub-interface.

Procedure

Configure an IPv4 address for a sub-interface.
1. On the PE device, run system-view
  The system view is displayed.
2. Run interface interface-type interface-number
  The interface view is displayed.
3. Run port link-type { hybrid | trunk }
  The port link-type is set.
4. Run quit
  Return to the system view.
5. Run interface interface-type interface-number.subinterface-number
  The view of the sub-interface connecting the PE to the CE is displayed.
6. Run ip address ip-address { mask | mask-length }
  An IPv4 address is configured for the sub-interface.
7. Run dot1q termination vid low-pe-vid [ to high-pe-vid ]
  Dot1q termination is configured on the sub-interface.
  
  After a VLANIF interface is configured, the corresponding VLAN cannot be configured as a VLAN for Dot1q termination sub-interfaces or an outer VLAN for QinQ termination sub-interfaces.
8. Run arp broadcast enable
  The sub-interface is enabled to forward ARP broadcast packets.
Configure an IPv6 address for a sub-interface.
1. On the PE device, run system-view
  The system view is displayed.
2. Run ipv6
  IPv6 packet forwarding is enabled.
3. Run interface interface-type interface-number
  The interface view is displayed.
4. Run port link-type { hybrid | trunk }
  The port link-type is set.
5. Run quit
  Return to the system view.
6. Run interface interface-type interface-number.subinterface-number
  The view of the sub-interface connecting the PE to the CE is displayed.
7. Run ipv6 enable
  The IPv6 function is enabled on the interface.
8. Run ipv6 address { ipv6-address prefix-length | ipv6-address/prefix-length }
  An IPv6 address is configured for the sub-interface.
9. Run dot1q termination vid low-pe-vid [ to high-pe-vid ]
  Dot1q termination is configured on the sub-interface.
  
  After a VLANIF interface is configured, the corresponding VLAN cannot be configured as a VLAN for Dot1q termination sub-interfaces or an outer VLAN for QinQ termination sub-interfaces.
10. Run ipv6 nd ns multicast-enable
  The sub-interface is enabled to send NS multicast packets.