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S9300, S9300E, and S9300X V200R012C00 Configuration Guide - Ethernet Switching

This document describes the configuration of Ethernet services, including configuring MAC address table, link aggregation, VLANs, VLAN aggregation, MUX VLAN, VLAN termination, Voice VLAN, VLAN mapping, QinQ, GVRP, STP/RSTP/MSTP, VBST, SEP, RRPP, ERPS, LBDT, HVRP, and Layer 2 protocol transparent transmission.
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Configuring a Dot1q Termination Sub-interface to Implement Inter-VLAN Communication

Configuring 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. This allows the users to communicate with each other.

  • 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 system-view

    The system view is displayed.

  2. Run interface interface-type interface-number.subinterface-number

    The sub-interface view is displayed.

  3. Run ip address ip-address { mask | mask-length } [ sub ]

    An IP address is assigned to the sub-interface.

  4. 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, whereas 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 a maximum of 128 VLANs be in all VLAN ranges.

  5. 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 of the sub-interface alternates between Down and Up. This may result in route flapping on the entire network, affecting normal operation of services.

Updated: 2019-01-18

Document ID: EDOC1100038290

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