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AR500, AR510, and AR530 V200R007 CLI-based Configuration Guide - Ethernet Switching

This document describes the configuration of Ethernet services, including configuring transparent bridge, MAC table, link aggregation, VLANs, STP/RSTP/MSTP, and so on.The document provides the configuration procedures and configuration examples to illustrate the service configuration methods and application scenario.
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Selective QinQ

Selective QinQ

Selective QinQ, also known as VLAN Stacking or QinQ Stacking, is performed based on ports and VLAN IDs. Besides basic QinQ functions, selective QinQ has the following functions:
  • VLAN ID-based selective QinQ: adds outer VLAN tags based on VLAN IDs.
  • 802.1p priority-based selective QinQ: adds outer VLAN tags based on 802.1p priorities in inner VLAN tags.

Selective QinQ is an extension of basic QinQ and is more flexible. The difference is as follows:

  • Basic QinQ: adds the same outer VLAN tag to all the frames entering a Layer 2 port.

  • Selective QinQ: adds different outer VLAN tags to the frames entering a Layer 2 port based on the inner VLAN tags.

As shown in Figure 8-3, enterprise A has two branches that connect to the carrier network through PE1 and PE2 respectively.

Figure 8-3  Networking diagram of selective QinQ

Enterprise A has different services, so different VLANs are assigned. Data services are transmitted in VLAN 10 to VLAN 30, and voice services are transmitted in VLAN 31 to VLAN 50.

Selective QinQ is configured on the user-side interface of the CE to add outer VLAN 20 to packets with VLAN IDs 10 to 30, and outer VLAN 21 to packets with VLAN IDs 31 to 50, and the device is configured to increase the priority of voice packets. Traffic between two branches can be transparently transmitted through the public network so that users using the same service in different branches of enterprise A can communicate, users using different services are isolated, and voice services are transmitted preferentially.

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Updated: 2019-05-25

Document ID: EDOC1000097279

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