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Configuration Guide - Ethernet Switching

S7700 and S9700 V200R011C10

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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Configuring the Device to Add Double VLAN Tags to Untagged Packets

Configuring the Device to Add Double VLAN Tags to Untagged Packets


Generally, two devices are required to add double tags to packets. Configuring one device to add double VLAN tags to untagged packets can simplify configuration. In addition, a Layer 2 interface can add double tags to untagged packets to differentiate services or users.

This configuration is not supported on the ES0D0G24SA00 and ES0D0G24CA00 cards on the S7700, and the EH1D2S24CSA0 and EH1D2G24SSA0 cards on the S9700.


  1. Run system-view

    The system view is displayed.

  2. Run vlan vlan-id

    The outer VLAN is created.

  3. Run quit

    Return to the system view.

  4. Run interface interface-type interface-number

    The interface view is displayed.

  5. Run port link-type hybrid

    The link type of the interface is set to hybrid.

    By default, the link type of an interface is negotiation-desirable.

  6. Run port hybrid untagged vlan vlan-id

    The interface is added to the outer VLAN.

  7. Run port vlan-stacking untagged stack-vlan vlan-id1 stack-inner-vlan vlan-id2

    The interface is configured to add double VLAN tags to untagged packets.


    To enable an interface to add double VLAN tags to an untagged packet, you must set the link type of the interface to hybrid, and add the interface to the outer VLAN in untagged mode.

    If the PVID of an interface is not VLAN 1, restore the PVID to VLAN 1 before running the port vlan-stacking untagged command.

    The port vlan-stacking untagged command actually configures interface-based VLAN assignment. Different VLAN assignment modes are in the following order of priority: policy-based VLAN assignment > voice VLAN include-untagged > MAC address-based VLAN assignment > IP subnet-based VLAN assignment > protocol-based VLAN assignment > interface-based VLAN assignment.

Updated: 2019-10-18

Document ID: EDOC1000178310

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