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S12700 V200R010C00 Configuration Guide - Ethernet Switching

This document describes the configuration of Ethernet services, including configuring link aggregation, VLANs, Voice VLAN, VLAN mapping, QinQ, GVRP, MAC table, STP/RSTP/MSTP, SEP, and so on.
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Using a Dot1q Termination Sub-interface to Implement Inter-VLAN Communication

Using a Dot1q Termination Sub-interface to Implement Inter-VLAN Communication

When a Layer 3 switch connects to users located in different VLANs through a Layer 3 Ethernet interface, configure Dot1q termination sub-interfaces on this Layer 3 Ethernet interface to implement inter-VLAN communication.


When a Layer 3 switch connects to users on different network segments across different VLANs, configure Dot1q termination and IP addresses for the sub-interfaces to implement Layer 3 connectivity.

  • To implement inter-VLAN communication, hosts in each VLAN must use the IP address of the corresponding sub-interface as the default gateway address.

  • When VLAN IDs terminated by a sub-interface are used for Layer 3 forwarding, only the first VLAN takes effect even if multiple inner VLAN IDs are specified.


  1. Run:


    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 link type of the interface is set.

  4. Run:


    Exit from the interface view.

  5. Run:

    interface interface-type interface-number.subinterface-number

    The sub-interface view is displayed.

  6. Run:

    ip address ip-address { mask | mask-length } [ sub ]

    An IP address is assigned to the sub-interface.

  7. Run:

    dot1q termination vid low-pe-vid [ to high-pe-vid ]

    Dot1q termination is configured on the sub-interface.

    Sub-interfaces of different main interfaces can be associated with the same VLAN, but sub-interfaces of the same main interface cannot be associated with the same VLAN.


    When VLAN IDs terminated by a sub-interface are used for Layer 3 forwarding, it is recommended that 128 VLANs be in all VLAN ranges.

  8. Run:

    arp broadcast enable

    ARP broadcast is enabled on the sub-interface.

    When you enable or disable ARP broadcast on a sub-interface, the routing status on the sub-interface alternates between Down and Up. This may result in route flapping on the entire network, and affects normal operation of services.

Updated: 2019-08-21

Document ID: EDOC1000142081

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