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CLI-based Configuration Guide - Ethernet Switching

AR650, AR1600, and AR6100 V300R003

This document describes how to configure the components for LAN services, including link aggregation groups, VLANs, voice VLANs, MAC address tables, transparent bridging, as well as GVRP, STP/RSTP, and MSTP protocols.
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Overview of QinQ

Overview of QinQ


QinQ expands VLAN space by adding an additional 802.1Q tag to 802.1Q tagged packets. It allows services in a private VLAN to be transparently transmitted over a public network. A packet transmitted on the backbone network carries two 802.1Q tags: a public VLAN tag and a private VLAN tag.


Ethernet is widely used on ISP networks, but 802.1Q VLANs are unable to identify and isolate large numbers of users on metro Ethernet networks because the 12-bit VLAN tag field defined in IEEE 802.1Q only identifies a maximum of 4096 VLANs. QinQ was developed to expand VLAN space beyond 4096 VLANs so that a larger number of users can be identified on a metro Ethernet network.

QinQ technology encapsulates an 802.1Q tag to an 802.1Q packet. With this extra tag, the number of VLANs increases to 4094 x 4094.

In addition to expanding VLAN space, QinQ is applied in other scenarios with the development of metro Ethernet networks and carriers' requirements on refined service operation. The outer and inner VLAN tags can be used to differentiate packets based on users and services. For example, the inner tag represents a user, while the outer tag represents a service. Moreover, QinQ functions as a simple and practical VPN technology by transparently transmitting private VLAN services over a public network.


QinQ offers the following benefits:
  • Extends the VLAN space to isolate and identify more users.
  • Facilitates service deployment by allowing the inner and outer tags to represent different information. For example, the inner tag identifies a user and the outer tag identifies a service.
  • Allows ISPs to implement refined service operation by providing diversified encapsulation and termination modes.
Updated: 2019-04-12

Document ID: EDOC1100041791

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